DIADEXUS INC
S-1, 2000-11-20
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<PAGE>   1

   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 20, 2000

                                                 REGISTRATION NO. 333-
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                            ------------------------

                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

                                 DIADEXUS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                <C>                                <C>
             DELAWARE                             8731                            77-0464949
 (STATE OR OTHER JURISDICTION OF      (PRIMARY STANDARD INDUSTRIAL             (I.R.S. EMPLOYER
  INCORPORATION OR ORGANIZATION)         CLASSIFICATION NUMBER)              IDENTIFICATION NO.)
</TABLE>

                              3303 OCTAVIUS DRIVE
                         SANTA CLARA, CALIFORNIA 95054
                                 (408) 496-6600
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------

                                PATRICK PLEWMAN
                            CHIEF EXECUTIVE OFFICER,
                              PRESIDENT AND CHIEF
                               OPERATING OFFICER
                                 DIADEXUS, INC.
                              3303 OCTAVIUS DRIVE
                         SANTA CLARA, CALIFORNIA 95054
                                 (408) 496-6600
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------

                                   COPIES TO:

<TABLE>
<S>                                                 <C>
               MICHAEL W. HALL, ESQ.                           JOSEPH E. MULLANEY III, ESQ.
              ROBERT A. KOENIG, ESQ.                            MINTZ, LEVIN, COHN, FERRIS,
                 LATHAM & WATKINS                                 GLOVSKY AND POPEO, P.C.
              135 COMMONWEALTH DRIVE                               ONE FINANCIAL CENTER
         MENLO PARK, CALIFORNIA 94025-1105                      BOSTON, MASSACHUSETTS 02111
                  (650) 328-4600                                      (617) 542-6000
</TABLE>

                            ------------------------

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
                            ------------------------

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended (the "Securities Act") check the following box. [ ]
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of earlier effective
registration statement for the same offering. [ ]
---------------
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
---------------
    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
---------------
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

                     CALCULATION OF REGISTRATION FEE CHART

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------
----------------------------------------------------------------------------------------------------------------
               TITLE OF EACH CLASS OF                       PROPOSED MAXIMUM                  AMOUNT OF
             SECURITIES TO BE REGISTERED               AGGREGATE OFFERING PRICE(1)        REGISTRATION FEE
----------------------------------------------------------------------------------------------------------------
<S>                                                    <C>                           <C>
Common Stock, $0.01 par value........................         $100,000,000                     $26,400
----------------------------------------------------------------------------------------------------------------
----------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Estimated solely for the purpose of computing the amount of the registration
    fee pursuant to Rule 457(o) under the Securities Act of 1933.
                            ------------------------

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON
SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(a), MAY DETERMINE.
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<PAGE>   2

      THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE
      MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH
      THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS
      NOT AN OFFER TO SELL THESE SECURITIES AND IS NOT SOLICITING OFFERS TO BUY
      THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

                 SUBJECT TO COMPLETION, DATED NOVEMBER 20, 2000

PROSPECTUS

                                              Shares

                             [DIADEXUS, INC. LOGO]

                                  COMMON STOCK

--------------------------------------------------------------------------------

This is our initial public offering of shares of common stock. We are offering
          shares. No public market currently exists for our common stock.

We plan to apply to have our common stock approved for quotation on the Nasdaq
National Market under the symbol "DDXS." We expect the public offering price to
be between $     and $     per share.

    INVESTING IN THE SHARES INVOLVES RISKS. "RISK FACTORS" BEGIN ON PAGE 5.

<TABLE>
<CAPTION>
                                                              PER SHARE     TOTAL
                                                              ---------    --------
<S>                                                           <C>          <C>
Public offering price.......................................  $            $
Underwriting discounts and commissions......................  $            $
Proceeds, before expenses, to diaDexus......................  $            $
</TABLE>

We have granted the underwriters a 30-day option to purchase up to an additional
               shares of common stock solely to cover over-allotments.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

Lehman Brothers, on behalf of the underwriters, expects to deliver the shares on
or about             , 2001.

--------------------------------------------------------------------------------

LEHMAN BROTHERS

                CIBC WORLD MARKETS

                                PRUDENTIAL VECTOR HEALTHCARE
                                     A UNIT OF PRUDENTIAL SECURITIES

                                            FIDELITY CAPITAL MARKETS

               , 2001
<PAGE>   3

     [Description of inside cover page: Graphical information regarding
diaDexus, Inc. consisting of:

     - sources of molecular targets;

     - pictures of microarrays; and

     - bioinformatics computer results.]
<PAGE>   4

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Prospectus Summary....................    1
Risk Factors..........................    5
Forward-Looking Statements............   17
Use of Proceeds.......................   18
Dividend Policy.......................   18
Capitalization........................   19
Dilution..............................   20
Selected Financial Data...............   21
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................   23
Business..............................   28
Management............................   43
</TABLE>

<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Certain Relationships and Related
  Party Transactions..................   54
Principal Stockholders................   56
Description of Capital Stock..........   58
Shares Eligible for Future Sale.......   61
United States Tax Consequences to Non-
  U.S. Holders........................   63
Underwriting..........................   66
Legal Matters.........................   70
Experts...............................   70
Where You Can Find More Information...   70
Index to Financial Statements.........  F-1
</TABLE>

                            ------------------------

                             ABOUT THIS PROSPECTUS

     You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with information that is different
from that contained in this prospectus. This prospectus may only be used where
it is legal to sell these securities. The information in this prospectus is
accurate only as of the date of this prospectus, regardless of the time of
delivery of this prospectus or any sale of common stock.

     Until        , 2001 (25 days after commencement of this offering), all
dealers selling shares of our common stock, whether or not participating in this
offering, may be required to deliver a prospectus. This is in addition to the
obligation of dealers to deliver a prospectus when acting as underwriters and
with respect to their unsold allotments or subscriptions.
                                        i
<PAGE>   5

                               PROSPECTUS SUMMARY

     The following summary contains basic information about our business and
this offering. It may not contain all of the information that you should
consider before investing in our common stock. You should read this prospectus,
including "Risk Factors" and our financial statements and the related notes,
before making an investment decision. Except as otherwise indicated, all
information in this prospectus assumes the conversion of all outstanding shares
of preferred stock into shares of common stock immediately prior to the
completion of this offering, adoption of our restated certificate of
incorporation and no exercise of the underwriters' over-allotment option.

                                 DIADEXUS, INC.

     We are a post-genomics company focused on translating raw genomics data
into novel diagnostic and therapeutic products. Our relationships with our
co-founders, SmithKline Beecham and Incyte Genomics, recognized leaders in
genomics and bioinformatics, place our company at the forefront of the
commercial utilization of genomic information. Upon our formation in 1997, our
initial strategy was to discover molecular targets and develop novel diagnostic
products for the improved detection, classification and prognosis of diseases.
We recently expanded our strategy to include therapeutic discovery and
development. Where possible, we will seek to develop diagnostic and therapeutic
products that are directed at the same molecular target, enabling a
diagnostic/therapeutic tandem approach to detect and treat disease. Our initial
focus has been on the discovery of novel molecular targets in cancer. We expect
to extend our discovery platform beyond cancer into other diseases. To date, we
have identified thousands of disease-associated molecular targets, evaluated
over 200 potential molecular targets using bioMVP, our target validation
process, and advanced over 40 product candidates into development, including two
diagnostic product candidates in late-stage preclinical development. We are
aggressively seeking patent protection on our discoveries.

     We use three approaches to source novel molecular targets:

     - we perform large scale, high-throughput searches of Incyte's LifeSeq
       Gold, the leading genomic database. Upon our formation, Incyte granted us
       a fully paid subscription to LifeSeq Gold until September 2003. In
       addition, we also have a fully paid subscription to PathoSeq, Incyte's
       microbial database, until September 2003;

     - we integrate various cutting-edge genomic and proteomic technologies,
       including subtractive hybridization and gene and protein microarrays, to
       supplement our data mining efforts; and

     - we receive, through our relationship with SmithKline Beecham, diagnostic
       molecular targets that SmithKline Beecham identifies through September
       2001 as having potential diagnostic utility, including diagnostic
       molecular targets identified through its relationship with Human Genome
       Sciences through June 2001.

MOLECULAR DIAGNOSTICS

     We believe that genomics and proteomics fundamentally alter the underlying
economics of diagnostic discovery which, when combined with intellectual
property protection, have the potential to convert the diagnostic industry from
its current status as a generally low margin sector to a higher margin sector
based on patent-protected tests that can command high premiums. We were one of
the first companies to recognize the potential of genomics for diagnostics, and
we believe this first mover advantage is reflected in our product development
pipeline.

     Our goal is to discover and commercialize highly differentiated,
value-added diagnostic products. We believe these products will:

     - expand the universe of detectable diseases;

     - enable the early detection of disease when treatment is often most
       effective;

                                        1
<PAGE>   6

     - improve medical treatment by providing a more rigorous classification of
       a patient's disease, enabling individual tailoring of therapy; and

     - monitor the effectiveness of treatment for both approved drugs and drugs
       under development.

     Some diseases can be linked to a single gene and may be accurately detected
using single gene or single protein diagnostic tests. Other diseases, however,
are multi-factorial, involving the abnormal expression of multiple genes.
Although these multi-factorial diseases may be profiled using single analyte
tests, we believe that multi-analyte tests will render a more accurate diagnosis
of disease. As a result, we plan to develop multi-analyte tests that can
identify novel patterns of multiple gene and protein expression to detect and
monitor disease.

     Following SmithKline Beecham's collaboration with Human Genome Sciences in
1993, SmithKline Beecham has been at the forefront of discovering novel
molecular targets. Recognizing that such targets could potentially have
diagnostic as well as therapeutic utility, SmithKline Beecham established a
Molecular Diagnostics Group to mine the HGS database. Our company was formed
from this Molecular Diagnostics Group to exclusively develop diagnostic products
based on SmithKline Beecham's discoveries. Upon our formation, SmithKline
Beecham assigned us a portfolio of diagnostic product candidates discovered
through their early research efforts.

     We have continued the development of eight of these diagnostic product
candidates, including Lp-PLA(2), a novel risk factor for coronary heart disease,
and Cathepsin-K, a diagnostic marker for osteoporosis. We have completed initial
clinical utility studies on Lp-PLA(2) and have commenced initial clinical
utility studies on Cathepsin-K. The New England Journal of Medicine recently
published one of these studies, identifying Lp-PLA(2) as a novel risk factor for
coronary heart disease that is independent of, and potentially superior to,
other known risk factors. SmithKline Beecham has active therapeutic programs
targeting Lp-PLA(2) and Cathepsin-K.

     We have an option agreement with Quest Diagnostics, the world's largest
clinical reference laboratory, to license our products for use in so-called
"homebrew" tests. Homebrew tests are a category of diagnostic tests that are
conducted at a physician's request by a clinical reference laboratory and do not
currently require Food and Drug Administration approval. We believe the ability
to sell our products to these laboratories prior to our seeking FDA approval
will allow us to assess demand in the market, increase awareness of our future
products and generate early revenues. Where appropriate, we will seek FDA
approval for our diagnostic products. Eventually, we may license products to
large diagnostic companies to run on their high-throughput testing platforms
once significant demand for these products is established.

EXTENSION INTO THERAPEUTICS

     Recognizing that our discovery platform can yield molecular targets with
both diagnostic and therapeutic utility, we recently expanded our strategy to
include therapeutics. Our therapeutic product discovery and development efforts
will focus initially on therapeutic monoclonal antibodies, which are drugs that
specifically target disease-associated proteins found on the surface of cells.
We plan to enter into one or more therapeutic antibody collaborations.
Additionally, we plan to discover and develop therapeutic vaccines. A
significant portion of the proceeds of this offering will be used to establish
discovery, validation and product development efforts for therapeutic product
candidates.

                            ------------------------

     We were founded in 1997 as a limited liability company and were
incorporated in Delaware in 2000. Our principal executive offices are located at
3303 Octavius Drive, Santa Clara, California 95054, and our telephone number is
(408) 496-6600. Our website address is www.diadexus.com. Information contained
in our website is not incorporated by reference into this prospectus, and you
should not consider information contained in our website as part of this
prospectus.

     "diaDexus" is our registered trademark. This prospectus also contains
additional trade names, trademarks and service marks of other companies.
                                        2
<PAGE>   7

                                  THE OFFERING

Common stock offered by diaDexus........                 shares

Common stock to be outstanding
  after this offering...................                 shares

Use of proceeds.........................     To expand our discovery, validation
                                             and product development
                                             capabilities for diagnostic and
                                             therapeutic product candidates and
                                             for general corporate purposes,
                                             including working capital and the
                                             funding of operating losses. We may
                                             also use a portion of the net
                                             proceeds to acquire complementary
                                             businesses, products and
                                             technologies. See "Use of
                                             Proceeds."

Proposed Nasdaq National Market
symbol..................................     DDXS

     The number of shares of common stock to be outstanding after this offering
is based on 22,233,049 common and preferred shares outstanding as of September
30, 2000. The number of shares of common stock to be outstanding after this
offering excludes, as of September 30, 2000:

     - 2,287,250 shares of common stock issuable upon exercise of options
       outstanding under our 2000 Equity Incentive Plan at a weighted average
       exercise price of $1.05 per share;

     -      shares of common stock issuable upon exercise of options available
       for issuance under our 2001 Equity Incentive Plan;

     - 129,032 shares of common stock issuable upon exercise of a warrant
       outstanding at $7.75 per share; and

     -      shares of common stock available for purchase under our 2001
       Employee Stock Purchase Plan.

                                        3
<PAGE>   8

                             SUMMARY FINANCIAL DATA

     The following table sets forth summary financial data for our company. You
should read this information in conjunction with the information under "Selected
Financial Data," "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and our financial statements and the related notes
included elsewhere in this prospectus. Pro forma amounts give effect to the
automatic conversion of all outstanding shares of preferred stock into shares of
common stock immediately prior to the completion of this offering. Pro forma as
adjusted amounts also give effect to the sale of           shares of common
stock in this offering at an assumed initial public offering price of $     per
share, after deducting underwriting discounts and commissions and the estimated
offering expenses payable by us.

<TABLE>
<CAPTION>
                                     AUGUST 29,
                                  1997 (INCEPTION)                                   NINE MONTHS ENDED
                                      THROUGH         YEAR ENDED DECEMBER 31,          SEPTEMBER 30,
                                    DECEMBER 31,      ------------------------    -----------------------
                                        1997            1998           1999          1999          2000
                                  ----------------    ---------     ----------    -----------    --------
                                                                                  (UNAUDITED)
                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                               <C>                 <C>           <C>           <C>            <C>
STATEMENT OF OPERATIONS DATA:
License revenue.................       $  --           $    --       $    100       $   100      $     --
                                       -----           -------       --------       -------      --------
Operating expenses:
  Research and development......         401             6,761          9,461         7,654         7,182
  General and administrative....         279             1,882          2,345         1,877         3,903
                                       -----           -------       --------       -------      --------
Loss from operations............        (680)           (8,643)       (11,706)       (9,431)      (11,085)
Interest and other income.......         132               715            540           564         3,359
Interest expense................          --                --           (120)          (49)          (73)
                                       -----           -------       --------       -------      --------
Net loss........................       $(548)          $(7,928)      $(11,286)      $(8,916)     $ (7,799)
                                       =====           =======       ========       =======      ========
Basic and diluted net loss per
  share.........................       $  --           $    --       $     --       $    --      $(117.96)
                                       =====           =======       ========       =======      ========
Shares used to compute basic and
  diluted net loss per share....          --                --             --            --            66
Pro forma net loss per share,
  basic and diluted.............                                     $  (1.28)                   $  (0.45)
                                                                     ========                    ========
Shares used to compute pro forma
  net loss per share,
  basic and diluted.............                                        8,800                      17,441
</TABLE>

<TABLE>
<CAPTION>
                                                                  AS OF SEPTEMBER 30, 2000
                                                             -----------------------------------
                                                                                      PRO FORMA
                                                             ACTUAL     PRO FORMA    AS ADJUSTED
                                                             -------    ---------    -----------
                                                                       (IN THOUSANDS)
<S>                                                          <C>        <C>          <C>
BALANCE SHEET DATA:
Cash, cash equivalents and investments.....................  $93,689     $93,689
Working capital............................................   70,079      70,079
Total assets...............................................   97,462      97,462
Total liabilities..........................................    1,774       1,774
Total stockholders' equity.................................   95,688      95,688
</TABLE>

                                        4
<PAGE>   9

                                  RISK FACTORS

     Investing in our common stock involves a high degree of risk. You should
carefully consider the following risks, as well as other information contained
in this prospectus, before deciding to invest in shares of our common stock. If
any of the following risks actually occurs, our business, financial condition
and results of operations would suffer. In that case, the price of our common
stock could decline, and you might lose all or part of your investment.

                         RISKS RELATED TO OUR BUSINESS

OUR BUSINESS PROSPECTS ARE DIFFICULT TO EVALUATE BECAUSE WE HAVE A LIMITED
OPERATING HISTORY.

     Our company was founded in 1997, and we are still at an early stage of
development. We have not yet completed the development of any products for
commercial sale, and whether we will discover molecular targets with clinical
utility, and whether we can develop commercially successful products from any
such discoveries, is uncertain. Furthermore, we have had no material revenues to
date. Accordingly, we have a limited operating history from which you can
evaluate our present business and future prospects. As a relatively new entrant
into the field of molecular target discovery and development, we face risks and
uncertainties relating to our ability to implement our business plan
successfully. Our prospects must be considered in light of the risks, expenses
and difficulties frequently encountered by companies in their early stage of
development, particularly companies in new and rapidly evolving markets such as
molecular medicine. If we are unsuccessful in addressing these risks and
uncertainties, we may never become profitable and our financial condition would
suffer.

WE HAVE A HISTORY OF LOSSES AND NEGATIVE CASH FLOWS AND ANTICIPATE CONTINUED
LOSSES FOR
THE FORSEEABLE FUTURE.

     We have incurred losses since our inception, including net losses of $11.3
million for the year ended December 31, 1999 and $7.8 million for the nine
months ended September 30, 2000. As of September 30, 2000, we had an accumulated
deficit of $5.2 million since our incorporation in April 2000. We must spend
significant amounts to fund research and development and to expand our
validation and product development efforts for diagnostic and therapeutic
product candidates. As a result, we expect to incur operating losses and
negative cash flows for the foreseeable future. We do not know whether we will
ever achieve profitability on a quarterly or annual basis.

OUR QUARTERLY OPERATING RESULTS MAY FLUCTUATE SIGNIFICANTLY, AND ANY FAILURE TO
MEET FINANCIAL EXPECTATIONS MAY RESULT IN A SIGNIFICANT DECLINE IN OUR STOCK
PRICE.

     Our quarterly operating results have fluctuated in the past and are likely
to do so in the future. Some of the factors that could cause our operating
results to fluctuate include:

     - the timing and willingness of collaborators to commercialize our product
       candidates;

     - the timing, release and competitiveness of our future products and those
       of our competitors;

     - our ability to develop, obtain regulatory clearance and introduce
       products for commercial sale on a timely basis;

     - changes in the cost, quality and availability of tissue samples,
       equipment, reagents and components required to manufacture or use our
       future products;

     - general and industry-specific economic conditions, which may affect our
       customers' research and development expenditures and use of our products;
       and

     - availability of commercial and government funding to researchers who test
       our product candidates.

     We believe that quarter-to-quarter comparisons of our operating results are
not a good indication of our future performance. It is likely that in some
future quarter or quarters, our operating results will be
                                        5
<PAGE>   10

below the expectations of securities analysts or investors. In that case, our
stock price could decline significantly and our stockholders would experience a
decline in the value of their investment.

WE HAVE NOT DEVELOPED ANY PRODUCTS FOR COMMERCIAL SALE, AND OUR PRODUCT
CANDIDATES MAY NEVER BE FULLY DEVELOPED IN A MANNER SUITABLE FOR COMMERCIAL
SUCCESS.

     We have not developed any products for commercial sale or proven our
ability to do so. We must conduct a substantial amount of additional research
and development before regulatory authorities will approve any of our existing
diagnostic product candidates or before such diagnostic products will be ready
for the homebrew market. Our most advanced diagnostic product candidate,
Lp-PLA(2), must undergo several additional studies to confirm its clinical
utility, and we do not expect regulatory approval for our own diagnostic kit for
at least three years. Our research may conclude that Lp-PLA(2) or our other
diagnostic product candidates are not safe and effective, in which case
regulatory authorities will not approve them. One of our first product
candidates, which we believed was a novel target for prostate cancer, was found
to be ineffective after we had incurred significant research and development
expense. Problems inherent in the development of new products and the
competitive environment in which we operate may limit our ability to develop
commercially successful products. Even if we develop products for commercial use
and obtain all necessary regulatory approvals, our products may not be accepted
by the research, diagnostic, medical and pharmaceutical marketplaces unless we
are able to convince prospective customers that our products are more reliable
and cost-effective than other means of detection and treatment of disease.

     Our development of future products is subject to the risks of failure
inherent in the development of new products based on new technologies. These
risks include, but are not limited to:

     - unplanned delays or expenditures in product development;

     - our failure to achieve validation of our product candidates in clinical
       trials;

     - our failure to achieve acceptance of our diagnostic tests by clinical
       testing laboratories;

     - our failure to receive regulatory approvals in a timely manner;

     - the emergence of superior products;

     - our inability to have our products manufactured on a commercial scale;

     - our reliance on collaborative partners to successfully complete
       development of our product candidates; and

     - the failure of any future products to achieve broad market acceptance.

WE DEPEND ON SMITHKLINE BEECHAM AND INCYTE FOR KEY GENOMIC INTELLECTUAL PROPERTY
AND ACCESS TO GENOMIC DATABASES, AND OUR CONTRACTUAL RELATIONSHIPS WITH THESE
COMPANIES END IN THE NEAR FUTURE.

     Our founders SmithKline Beecham and Incyte have contributed a substantial
asset base of genomic intellectual property to our company. In connection with
our formation, SmithKline Beecham agreed to assign to us targets it determines
from its research and development to have potential diagnostic utility through
September 2001, including targets derived from its collaboration with Human
Genome Sciences which ends in June 2001. To date, eight of our 43 diagnostic
molecular target product candidates were assigned us by SmithKline Beecham,
including our two late stage diagnostic product candidates, Lp-PLA(2) and
Cathepsin-K. SmithKline Beecham's collaboration with Human Genome Sciences
terminates in June 2001, and thereafter we will no longer have a right to
license diagnostic molecular targets derived from Human Genome Sciences. Our
rights to molecular targets with diagnostic potential derived from SmithKline
Beecham's collaboration with Human Genome Sciences could terminate prior to June
2001 in the event that either party breaches the collaboration agreement or
otherwise determines to terminate the collaboration prematurely. In addition,
SmithKline Beecham's obligation to offer us molecular targets with diagnostic
potential discovered from its research and development efforts terminates in
September 2001.

                                        6
<PAGE>   11

As a result, we will lose a significant source of new diagnostic molecular
targets in 2001. We must file research reports prior to the termination of these
relationships and update these reports twice yearly in order to preserve our
rights to these molecular targets. We will lose our rights to these diagnostic
molecular targets if we fail to actively pursue their development or to file the
required research reports on a timely basis. SmithKline Beecham may discover
significant diagnostic molecular targets after September 2001 or, alternatively,
we may not identify until after September 2001 the diagnostic utility of a
molecular target which SmithKline Beecham offers prior to the termination of our
relationship. In either case, we will have no rights to these molecular targets
under our agreement with SmithKline Beecham.

     In January 2000, SmithKline Beecham and Glaxo Wellcome announced plans to
merge. While we do not believe that this merger will adversely affect our
relationship with SmithKline Beecham, we do not know whether we will encounter
unexpected difficulties as a result of the merger.

     In connection with our founding, Incyte granted us a fully paid
subscription to its LifeSeq Gold and PathoSeq databases. LifeSeq Gold is the
largest database of its kind in the world. Our subscription to Incyte's
databases terminates in September 2003, and we do not know whether we will be
able to renew the subscription at that time. In the event that we breach our
agreement with Incyte, we may lose access to Incyte's databases prior to
September 2003. One of our primary methods of identifying potential molecular
targets is through database mining of LifeSeq Gold. If we are unable to retain
access to Incyte's databases, we do not know whether we will be able to obtain
access to an acceptable alternative genomics database.

     Under our agreement with Incyte, we have no right to sub-license any
antibody products we may develop based on our access to the LifeSeq Gold
database unless the sub-licensee also subscribes to the LifeSeq Gold database.
This may limit our ability to commercialize antibody products we may discover
from the LifeSeq Gold database.

     The termination of our relationship with SmithKline Beecham in September
2001 and the termination of our subscription to Incyte's databases in September
2003, or earlier, will result in the loss to our company of two significant
sources of molecular targets. We do not know whether we will be able to obtain
alternative sources of molecular targets on commercially reasonable terms or at
all. Our business will fail if we are unable to identify and develop novel
molecular targets for the detection and treatment of disease.

OUR PRODUCT CANDIDATES WILL BE SUBJECT TO A LENGTHY AND UNCERTAIN REGULATORY
PROCESS AND WE DO NOT HAVE, AND MAY NEVER OBTAIN, THE REGULATORY APPROVALS
NEEDED TO MARKET PRODUCTS.

     The Food and Drug Administration, or FDA, regulates all diagnostic kits,
vaccines and therapeutic products, many of which must be approved before they
can be marketed in the United States. The regulatory process is expensive, time
consuming and uncertain. Before receiving approval from the FDA to market our
product candidates, they must undergo extensive testing, possibly including
animal and human clinical trials, which can take many years and require
substantial expenditures. Data obtained from such testing are susceptible to
varying interpretations which could delay, limit or prevent regulatory approval.
In addition, changes in regulatory policy for product approval during the period
of product development and regulatory agency review of each regulatory filing
may cause delays or rejections.

     Because our product candidates involve the application of new technologies
for the diagnosis and treatment of disease, they may be subject to substantial
review by government regulatory authorities. Government regulatory authorities
also may grant regulatory approvals more slowly for our products than for
products that use more conventional technologies. To date, we have not submitted
an application to the FDA or any other regulatory authority for any product
candidate. The regulatory agencies of foreign governments may impose similar
review and approval requirements before our product candidates can be sold in
those other countries.

     Even after investing significant time and expenditures, we may not be able
to obtain regulatory approval for our product candidates. If we do receive
regulatory approval, this approval may entail

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<PAGE>   12

limitations on the indicated uses for which we can market our products. Further,
once regulatory approval is obtained, a marketed product and its manufacturer
are subject to continual review, and the discovery of previously unknown
problems with a product or manufacturer may result in restrictions on the
product, manufacturer or manufacturing facility, including withdrawal of the
product from the market.

WE MAY BE LESS ATTRACTIVE AS A TAKEOVER CANDIDATE BECAUSE OF TERMINATION
PROVISIONS IN OUR CONTRACTS WITH SMITHKLINE BEECHAM AND INCYTE.

     If we merge with or are acquired by a pharmaceutical company prior to
September 2001, nearly all of SmithKline Beecham's obligations to us and our
rights to license diagnostic targets will immediately terminate. In addition,
our fully paid subscription to the Incyte databases will terminate under most
circumstances if we are acquired by a third party who is not a LifeSeq Gold
subscriber. This may have the effect of discouraging third parties from seeking
to acquire our company and depriving our stockholders of the opportunity to earn
any premium associated with a takeover proposal.

OUR RELATIONSHIP WITH QUEST DIAGNOSTICS MAY PREVENT US FROM COMMERCIALIZING
HOMEBREW DIAGNOSTIC PRODUCTS THROUGH OTHER PARTIES AND MAY LIMIT OUR ABILITY TO
ACHIEVE MARKET ACCEPTANCE.

     Quest Diagnostics has a right of first negotiation for an exclusive license
to any homebrew products we develop through 2005. If Quest exercises this right,
we may be required to enter into an exclusive contract on pre-negotiated terms
which may not reflect the commercial value of the test. Under an exclusive
arrangement, Quest may fail to meet our sales expectations, which could impair
market acceptance for our novel tests.

IF WE FAIL TO IDENTIFY MOLECULAR TARGETS DETECTABLE IN SERUM, OUR BUSINESS WILL
BE SERIOUSLY HARMED.

     We believe that, in order to gain widespread market acceptance, our
diagnostic screening products must be detectable in serum and compatible with
the existing installed base of high-throughput testing instruments in clinical
laboratories. Not all molecular targets are found in serum, however, and we may
discover valid molecular targets which are detectable only in tissue. We may be
unable to develop diagnostic product candidates that are detectable in serum,
even if such molecular targets possess the requisite sensitivity and specificity
to have clinical utility. Furthermore, we may devote substantial efforts to the
development of a particular molecular target before concluding that such
molecular target is not detectable in serum. If we do not identify serum-based
molecular targets which we can develop into marketable diagnostic products, our
business will be seriously harmed.

OUR FUTURE SUCCESS DEPENDS ON OUR ABILITY TO ENTER INTO COLLABORATIONS WITH
OTHER COMPANIES. IF WE ARE UNABLE TO ENTER INTO SUCCESSFUL COLLABORATIONS IN THE
FUTURE, WE MAY NOT BE ABLE TO DEVELOP OUR TECHNOLOGIES OR PRODUCT CANDIDATES OR
SELL OUR FUTURE PRODUCTS COMMERCIALLY.

     We will need to enter into collaborative arrangements for the
commercialization of our diagnostic products and the development and
commercialization of our therapeutic products. We have limited or no control
over the resources that any collaborator may devote to our product candidates.
Any of our present or future collaborators may not perform their obligations as
expected. These collaborators may breach or terminate their agreement with us or
otherwise fail to conduct their collaborative activities successfully and in a
timely manner. Further, our collaborators may elect not to develop product
candidates arising out of collaborative arrangements or not to devote sufficient
resources to the development, manufacture, marketing or sale of our future
products.

MANY EXISTING AND PROSPECTIVE COMPETITORS WHO HAVE GREATER RESOURCES AND
EXPERIENCE MAY DEVELOP PRODUCTS FASTER THAN WE DO AND RENDER OUR PRODUCT
CANDIDATES OBSOLETE.

     The pharmaceutical and medical diagnostic industries are highly competitive
and are characterized by rapid technological change. The area of genomics and
proteomics, in particular, is a rapidly evolving field. Our future success will
depend on our ability to maintain a competitive position with respect to

                                        8
<PAGE>   13

technological advances. Our existing or prospective competitors may develop
processes or products that are more effective than ours or be more effective at
implementing their technologies to develop commercial products faster.

     We face, and will continue to face, intense competition from large
biotechnology, pharmaceutical and other companies, as well as academic and
scientific research institutions, government agencies and public and private
research organizations that are pursuing the same or competing molecular targets
and products derived from them. Many of our competitors have substantially
greater financial, technical, research, marketing, sales, distribution, service
and other resources than we do. Moreover, our competitors may offer broader
product lines and have greater name recognition than us. These organizations may
develop processes or products that are superior to ours. Our competitors may
succeed in obtaining patent protection or receiving approval from the FDA for
commercializing products before us. Developments by competitors may render our
product candidates obsolete or noncompetitive.

WE DEPEND ON KEY PERSONNEL AND MUST ATTRACT AND RETAIN ADDITIONAL EXPERIENCED
PROFESSIONALS.

     We depend on the principal members of our management and scientific staff,
the loss of whose services would adversely affect our company. The loss of the
services of any of the principal members of our management and scientific staff
could delay the development and commercial sale of our product candidates and
harm our business. We do not maintain "key man" life insurance for any of our
employees.

     Recruiting and retaining qualified scientific professionals to perform
research and development work is critical to our success. Currently, we do not
have sufficient senior scientific personnel to execute our business plan. There
is currently a shortage of skilled executives in Northern California, where our
executive offices and research and development facilities are located, which is
likely to continue. As a result, competition for experienced professionals is
intense, and the turnover rate can be high. Competition for experienced
scientists from numerous companies and academic and other research institutions
may limit our ability to attract and recruit qualified personnel on acceptable
terms. Failure to attract and retain personnel would prevent us from pursuing
collaborations or developing our products or core technologies.

     We work with scientific advisors and collaborators at academic and other
institutions. These scientists are not our employees and may have other
commitments that limit their availability. Although our scientific advisors
generally agree not to perform competing work, if a conflict of interest between
their work for our company and their work for another entity arises, we may lose
their services. If we lose the services of any of these advisors, the
achievement of our business objectives may be impeded.

WE WILL NEED ADDITIONAL CAPITAL TO FUND OUR FUTURE OPERATIONS. IF WE ARE UNABLE
TO OBTAIN ADDITIONAL CAPITAL, OUR ABILITY TO DEVELOP OUR PROCESSES AND PRODUCT
CANDIDATES MAY BE HARMED.

     We expect that our research and development projects, together with the
filing, prosecution and enforcement of patent claims, will require significant
capital in the future. We do not know whether our business or operations will
change in a manner that would consume available resources more rapidly than
anticipated. Our future revenue may not be adequate to meet our operational
needs and capital requirements for product development and commercial sale. We
may need to raise additional capital as a result of:

     - our progress with our research and development programs;

     - our level of success in developing and marketing our product candidates;

     - our ability to establish and maintain successful collaborations; and

     - the costs we incur in enforcing and defending our patent claims and other
       intellectual property rights.

     If we raise additional funds through the sale of equity, convertible debt
or other equity-linked securities, your percentage ownership in our company will
be reduced. These transactions may dilute the

                                        9
<PAGE>   14

value of your common stock, and we may issue securities that have rights,
preferences and privileges senior to our common stock.

     Additional funds may not be available when needed on terms acceptable to us
or at all. If adequate funds are not available on acceptable terms, we may have
to reduce substantially or eliminate expenditures for the development and
commercial sale of our product candidates or obtain funds through arrangements
with collaborative partners that require us to relinquish rights to product
candidates. Either of these alternatives could have a material adverse effect on
our business and future growth prospects.

WE MAY ENCOUNTER DIFFICULTIES IN MANAGING OUR ANTICIPATED GROWTH, AND THESE
DIFFICULTIES COULD INCREASE OUR LOSSES.

     If we are unable to manage our anticipated future growth effectively, our
losses could increase. Our ability to manage our operations and growth
effectively requires us to continue to expend funds to improve our operational,
financial and management controls, reporting systems and procedures and to
attract and retain sufficient numbers of talented employees. If we are unable to
implement improvements to our management information and control systems in an
efficient and timely manner, or if we encounter deficiencies in existing systems
and controls, then our management may receive inadequate information to manage
the day-to-day operations of our company.

IF WE COMPLETE ANY ACQUISITION, WE WILL INCUR A VARIETY OF COSTS AND MAY NEVER
REALIZE THE ANTICIPATED BENEFITS OF THE ACQUISITION.

     If appropriate opportunities become available, we may seek to acquire
businesses, technologies, intellectual property, services or products that we
believe are a strategic fit with our business. We currently have no commitments
or agreements with respect to any material acquisitions. If we undertake any
transaction of this sort, the process of integrating an acquired business,
technology, service or product may result in unforeseen operating difficulties
and expenditures, and may absorb significant management attention that would
otherwise be available for ongoing development of our business. Moreover, we may
fail to realize the anticipated benefits of any acquisition. Future acquisitions
could dilute our stockholders or cause us to incur debt, expose us to future
liabilities or result in amortization expenses related to goodwill and other
intangible assets.

     In addition, recent proposed changes in the Financial Accounting Standards
rules for business combination accounting may affect the cost of making
acquisitions or of being acquired. For example, if we acquire another company
and these proposed changes become effective, we likely would have to record
goodwill or other intangible assets that would reduce our earnings. This would
adversely impact our future operating results and either reduce our
profitability or increase our losses. Further, accounting rule changes that
reduce the availability of immediate write-offs of the value of acquired
in-process research and development in connection with an acquisition could
result in the capitalization and amortization of these amounts, negatively
impacting our results of operations in future periods.

WE HAVE NO EXPERIENCE IN MANUFACTURING OR MARKETING PRODUCTS AND MAY ENCOUNTER
PROBLEMS OR DELAYS, WHICH WOULD RESULT IN LOST REVENUE.

     We have no experience in manufacturing and marketing, and we do not have
the resources or capability to manufacture or market products on a commercial
scale. In order for us to sell our future products directly, we will need to
develop, or obtain through outsourcing or marketing and distribution agreements,
manufacturing, marketing and sales capabilities. We may not be able to develop
or otherwise obtain the requisite manufacturing, marketing and sales
capabilities.

     Contract manufacturers may utilize their own technology, our technology or
technology acquired or licensed from third parties to develop manufacturing
processes. In order to engage a contract manufacturer, we may need a license or
other technology transfer. Even if a license is available from a contract
manufacturer on reasonable terms, we may be unable to effect successfully the
transfer of the technology to the contract manufacturer. Also, any such
technology transfer may require the transfer of
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<PAGE>   15

requisite data for regulatory purposes. If we were to rely on a contract
manufacturer, our ability to change contract manufacturers may be limited.

     Our inability to control all of the factors that affect manufacturing
processes may prevent us from achieving production in volumes needed. As a
result, manufacturing and quality control problems may arise as we attempt to
increase the production rate at manufacturing facilities. We may not be able to
increase production rates at these facilities in a timely and cost-effective
manner or at a commercially reasonable cost.

PRODUCT LIABILITY LAWSUITS COULD ADVERSELY AFFECT OUR BUSINESS.

     We may be held liable if any of our future products, or any product that is
made with our technologies, fails to accurately diagnose or detect disease,
causes injury or is found otherwise unsuitable during product testing,
manufacturing, marketing or sale. Although we intend to seek product liability
insurance, this insurance may be prohibitively expensive and may not fully cover
our potential liabilities. Our inability to obtain sufficient insurance coverage
at an acceptable cost or otherwise to protect against potential product
liability claims could prevent or inhibit the commercial sale of our products.
Furthermore, our customers may not indemnify us against these types of claims or
they may not be adequately insured or in the case of smaller companies, have a
net worth sufficient to satisfy product liability claims. If we are sued for any
injury caused by our products, our liability could exceed our total assets. Any
claims against us, regardless of their merit, could harm our business and cause
our stock price to decline.

WE USE HAZARDOUS CHEMICALS AND RADIOACTIVE AND BIOLOGICAL MATERIALS IN OUR
BUSINESS, AND ANY CLAIMS RELATING TO IMPROPER HANDLING, STORAGE OR DISPOSAL OF
THESE MATERIALS COULD BE EXPENSIVE AND TIME CONSUMING.

     Our research and development processes involve the controlled use of
hazardous materials, including chemicals and radioactive and biological
materials. Our operations also produce hazardous waste products. We cannot
eliminate the risk of accidental contamination or discharge and any resultant
injury from these materials. Federal, state and local laws and regulations
govern the use, manufacture, storage, handling and disposal of these materials.
We could be subject to civil damages in the event of an improper or unauthorized
release of, or exposure of individuals to, hazardous materials. In addition,
claimants may sue us for injury or contamination that results from our use, or
the use by third parties, of these materials, and our liability may exceed our
total assets. Compliance with environmental laws and regulations may be
expensive, and current or future environmental regulations may impair our
research, development or production efforts.

HEALTH CARE REFORM AND RESTRICTIONS ON REIMBURSEMENTS MAY LIMIT RETURNS ON OUR
PRODUCTS.

     Our ability to sell future products will depend in part on the extent to
which reimbursement for these products will be available from government payors,
such as Medicare and Medicaid, private health insurers and managed care
organizations. Significant uncertainty exists as to the reimbursement status of
newly approved health care products and novel procedures, and we do not know
whether adequate payment will be available for any of our product candidates to
enable us to maintain price levels sufficient to realize an appropriate return
on our investment in research and product development. In certain foreign
countries, regulatory agencies also set or approve prices.

WE MUST OBTAIN REIMBURSEMENT CODES AND A SATISFACTORY REIMBURSEMENT RATE FOR OUR
PRODUCT CANDIDATES.

     Our strategy assumes that we will be able to sell homebrew products and FDA
approved diagnostic kits at prices representing a substantial premium above the
prices of existing diagnostic tests. In order to achieve these premiums, we will
need to obtain specific reimbursement codes for our tests. Even if we are
successful in obtaining reimbursement codes, we do not know whether the level of
reimbursement will be consistent with the assumption underlying our strategy. We
have not yet begun the process of applying for

                                       11
<PAGE>   16

these reimbursement codes, and the assignment of these codes may take several
years. Moreover, we do not expect that we will obtain a reimbursement code
before we launch our first product candidate, Lp-PLA(2), in the homebrew market.
We may not be able to obtain these codes in a timely fashion or at all. If we
fail to obtain the level of reimbursement we are seeking, we may never achieve
or maintain profitability.

                     RISKS RELATED TO INTELLECTUAL PROPERTY

ANY INABILITY TO ADEQUATELY PROTECT OUR PROPRIETARY TECHNOLOGIES, PRODUCTS AND
PRODUCT CANDIDATES COULD HARM OUR COMPETITIVE POSITION.

     Our success will depend in large part on our ability to obtain patents and
maintain adequate protection of our intellectual property in the United States
and other countries. If we do not adequately protect our intellectual property,
our competitors may be able to make use of our molecular targets and erode our
competitive advantage. In addition, the laws of some foreign countries do not
protect proprietary rights to the same extent as the laws of the United States,
and many companies have encountered significant problems in protecting their
proprietary rights in these foreign countries. These problems can be caused by,
for example, a lack of rules and methods for defending intellectual property
rights.

     The patent positions of biopharmaceutical and biotechnology companies,
including our patent positions, are generally uncertain and involve complex
legal and factual questions. Our patent applications may not protect our
technologies or product candidates for any one or more of the following reasons:

     - some or all of our pending patent applications may not result in issued
       patents;

     - we may develop additional proprietary technologies that are not
       patentable;

     - any patents issued to us may not cover commercially viable products;

     - any patents issued to us may not provide us with sufficient scope so as
       to block others from using our or similar technology;

     - we may require access to patents issued to third parties in order to
       operate; and

     - any patents issued to us may be challenged, circumvented or invalidated
       by third parties.

     We will be able to protect our proprietary rights from unauthorized use by
third parties only to the extent that our proprietary technologies are covered
by valid and enforceable patents or are effectively maintained as trade secrets.
Our pending patent applications may not ever issue as patents, and we may be
unable to keep our competitors from commercializing our discoveries. We plan to
apply for patents covering our technologies and products as we deem appropriate.
However, while the U.S. Patent and Trademark Office, or USPTO, has issued
patents covering full-length genes, and some partial gene sequences, the USPTO
has recently issued strict utility requirements for gene applications. Under
these new strict utility requirements, we do not know whether our pending patent
applications will issue as patents and, if they do, whether the scope of the
claims will be sufficiently broad to prevent third parties from utilizing our
technologies or from developing competing products. Any patents we have now or
obtain in the future may not be sufficiently broad to prevent others from
utilizing our technologies or from developing competing products. Furthermore,
others may independently develop similar or alternative technologies or design
around our patented technologies. In addition, others may challenge or
invalidate our patents, or our patents may fail to provide us with any
competitive advantage.

     Should third parties file patent applications, or be issued patents,
claiming technology also claimed by us in pending applications, we may be
required to participate in interference proceedings in the USPTO to determine
priority of invention. We, or our licensors, may also need to participate in
interference proceedings involving our issued patents and pending applications
of another entity. An unfavorable outcome in an interference proceeding could
require us to cease using the technology or license rights from

                                       12
<PAGE>   17

prevailing third parties. There is no guarantee that any prevailing party would
offer us a license or that we could acquire any license made available to us on
commercially acceptable terms.

     Should third parties file patent applications, or be issued patents,
claiming technology also claimed by us in pending applications, we may be
required to participate in interference proceedings in USPTO to determine
priority of invention. We, or our licensors, may also need to participate in
interference proceedings involving our patents and pending applications. An
unfavorable outcome in an interference proceeding could require us to cease
using the technology or license rights from prevailing third parties. There is
no guarantee that any prevailing party would offer us a license or that we could
acquire any license made available to us on commercially acceptable terms.

     We may not be able to obtain new patents for our products or methods. Even
if we are able to obtain new patents, these patents may not provide us with
substantial or meaningful protection or be commercially beneficial to us. The
issuance of a patent is not conclusive as to its validity or its enforceability.
Further, a patent does not provide the patent holder with an absolute right to
practice such patented technology. Any patents issued to us or to our licensors
may be challenged and subsequently invalidated or circumvented. It is quite
possible that third parties may have patents of their own which could, if
asserted, prevent us from practicing our patented technologies. This inability
to practice our own patented technologies could adversely affect our business
and revenue.

     We have specified rights in patents and patent applications owned by
SmithKline Beecham, Human Genome Sciences and Incyte that may provide important
protection on the composition of matter and utility of our products. We do not,
however, control the prosecution and maintenance of these patents. SmithKline
Beecham, Human Genome Sciences and Incyte may allow these patents to go
abandoned or may not obtain meaningful claims for our products. Also, while the
USPTO has issued patents covering full-length genes, and some partial gene
sequences, we do not know whether or how courts will enforce these patents. If a
court finds these types of inventions to be unpatentable, or interprets them
narrowly, the benefits of our patent strategy may not materialize. If any or all
of these events occur, the value of our intellectual property could be
diminished.

OTHER RIGHTS AND MEASURES THAT WE RELY UPON TO PROTECT OUR INTELLECTUAL PROPERTY
MAY NOT BE ADEQUATE TO PROTECT OUR PRODUCTS AND COULD REDUCE OUR ABILITY TO
COMPETE IN THE MARKET.

     In addition to patents, we rely on a combination of trade secrets,
copyright and trademark laws, nondisclosure agreements and other contractual
provisions and technical measures to protect our intellectual property rights.
While we require employees, collaborators, consultants and other third parties
to enter into confidentiality and/or non-disclosure agreements where
appropriate, any of the following could still occur:

     - the agreements may be breached;

     - we may have inadequate remedies for any breach;

     - proprietary information could be disclosed to our competitors; and

     - others may independently develop substantially equivalent proprietary
       information and techniques or otherwise gain access to our trade secrets
       or disclose such technologies.

     If for any of the above reasons our intellectual property is disclosed,
invalidated or misappropriated, it would harm our ability to protect our rights
and our competitive position.

                      RISKS RELATED TO THIRD PARTY RIGHTS

THIRD PARTIES MAY HAVE PATENTS OF THEIR OWN WHICH COULD, IF ASSERTED, PREVENT US
FROM OBTAINING OR PRACTICING PATENTS ON OUR TECHNOLOGIES. THIS INABILITY TO
OBTAIN OR PRACTICE OUR OWN PATENTS COULD ADVERSELY AFFECT OUR BUSINESS AND
REVENUE.

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<PAGE>   18

     We use a database that belongs to Incyte. There are a number of other
companies that have non-exclusive access to the same genes and patent rights as
we do. In addition, a number of entities make gene sequences publicly available
at no cost. Either of these may adversely affect our ability to obtain
meaningful patent claims on our future products. Some of our patent applications
involve genes that may also be claimed in patent applications filed by others.
In some or all of such patent applications, a determination of priority of
inventorship may need to be decided in an interference proceeding before the
USPTO. Some of our patent applications claim genes useful as products that may
also be dominated by claims in patent applications filed by others. For some or
all of such patent applications, a license may be needed from the dominant
patent holder to make, have made, use or sell our products.

LITIGATION OR OTHER PROCEEDINGS OR THIRD PARTY CLAIMS OF INTELLECTUAL PROPERTY
INFRINGEMENT COULD REQUIRE US TO SPEND SIGNIFICANT AMOUNTS OF TIME AND CAPITAL
AND COULD SHUT DOWN SOME OR ALL OF OUR PRODUCTS AND OPERATIONS.

     Others have filed, and in the future are likely to file, patent
applications covering genes or gene fragments which we may wish to utilize, or
products that are similar to products developed with the use of our
technologies. Third parties may assert that we are using their proprietary
technologies without authorization. In addition, third parties may obtain
patents and claim that use of our technologies and products infringes these
patents. We could incur substantial costs and diversion of management and
technical personnel in defending against any of these claims or enforcing our
patents against others. Furthermore, parties making claims against us may be
able to obtain injunctive or other equitable relief which could effectively
block our ability to further develop and commercially sell our future products,
and could result in the award of substantial damages against us. In the event of
a successful claim of infringement against our company, we may be required to
pay damages and obtain one or more licenses from third parties. We may not be
able to obtain these licenses at a reasonable cost, if at all. In that event, we
could encounter delays in product introductions while we attempt to develop
alternative methods or products, which we may be unable to do.

     We are aware of patents and patent applications owned by third parties
which may cover certain aspects of the development and commercialization of some
of our diagnostic product candidates. We intend either to seek licenses under
any patents that relate to our product candidates or to modify such product
candidates so as not to infringe. We may not be able to obtain such licenses on
acceptable terms or at all, and product candidate modifications may require
substantial cost or delay. If neither approach is feasible, we could be subject
to a claim of patent infringement which, if successful, could prevent us from
commercializing these diagnostic product candidates.

                         RISKS RELATED TO THIS OFFERING

OUR MANAGEMENT WILL HAVE BROAD DISCRETION IN HOW WE USE THE NET PROCEEDS OF THIS
OFFERING, AND WE MAY NOT USE THESE PROCEEDS EFFECTIVELY.

     Our management will have broad discretion in the application of the net
proceeds of this offering, and you will not have the opportunity, as part of
your investment decision, to assess whether the proceeds are being used
appropriately. We currently expect to use approximately $     million to expand
our discovery, validation and product development capabilities for diagnostic
and therapeutic product candidates and the balance for general corporate
purposes, including working capital and the funding of operating losses. We may
also use a portion of the net proceeds to acquire complementary businesses,
products and technologies, although we have no current agreements regarding any
material transaction of this sort. We have not yet finalized the amount of net
proceeds to be used specifically for each of these purposes. The net proceeds
may be used for corporate purposes that do not lead to our profitability or
increase our market value.

                                       14
<PAGE>   19

MARKET PRICES OF EMERGING BIOTECHNOLOGY COMPANIES HAVE BEEN HIGHLY VOLATILE, AND
THE MARKET FOR OUR STOCK MAY EXHIBIT VOLATILITY AS WELL.

     The financial markets, including the Nasdaq National Market, have
experienced significant price and volume fluctuations, and the market prices of
technology companies, particularly biotechnology companies, have been and
continue to be extremely volatile. Volatility in the price of our common stock
may be caused by factors outside of our control and may be unrelated or
disproportionate to our operating results. In the past, following periods of
volatility in the market price of a public company's securities, securities
class action litigation has often been instituted against that company.
Securities class action litigation could result in substantial costs and a
diversion of our management's attention and resources.

SOME OF OUR EXISTING STOCKHOLDERS WILL BE ABLE TO EXERT CONTROL OVER US AFTER
THIS OFFERING WHICH WILL LIMIT YOUR ABILITY TO INFLUENCE THE OUTCOME OF KEY
TRANSACTIONS.

     After this offering, SmithKline Beecham and Incyte together will own
approximately      % of our outstanding common stock. These stockholders will be
able to influence significantly all matters requiring stockholder approval,
including the approval of significant corporate transactions. Circumstances may
arise in which the interests of these stockholders could conflict with the
interests of our other stockholders. These stockholders could delay or prevent a
change in control of our company even if such a transaction would be beneficial
to our other stockholders.

THE LARGE NUMBER OF SHARES ELIGIBLE FOR PUBLIC SALE AFTER THIS OFFERING COULD
CAUSE OUR STOCK PRICE TO DECLINE.

     The market price of our common stock could decline as a result of sales of
a large number of shares after this offering or the perception that sales could
occur. The large number of shares eligible for sale might make it more difficult
for us to sell common stock in the future at a time and at a price that we deem
appropriate. After this offering, we will have an aggregate of      shares
outstanding. Of the outstanding shares, the      shares sold in this offering
will be freely tradable, other than shares purchased by our affiliates. The
remaining shares may be sold only pursuant to a registration statement under the
Securities Act or an exemption from the registration requirements of the
Securities Act. After the completion of this offering, holders of 22,025,807
shares of common stock will be entitled to registration rights with respect to
the registration of their shares under the Securities Act. For additional
information regarding these registration rights, please see "Description of
Capital Stock -- Registration Rights" and "Shares Eligible for Future Sale."
Each of our directors and executive officers and a substantial majority of our
current stockholders has agreed not to offer, sell or agree to sell, directly or
indirectly, or otherwise dispose of any equity shares without the prior written
consent of Lehman Brothers Inc. for a period of 180 days from the date of this
prospectus. Lehman Brothers Inc. may, in its sole discretion, at any time and
without notice, release all or any portion of the shares subject to the lockup
agreements. For additional information regarding possible future sales of our
securities, please see "Shares Eligible for Future Sale" and "Underwriting."

AS A NEW INVESTOR, YOU WILL INCUR SUBSTANTIAL DILUTION AS A RESULT OF THIS
OFFERING AND FUTURE EQUITY ISSUANCES.

     The initial public offering price will be substantially higher than the pro
forma net tangible book value per share of our outstanding common stock. As a
result and based upon an assumed initial public offering price of $     per
share, investors purchasing common stock in this offering will incur immediate
dilution of $     per share. This dilution is due in large part to earlier
investors in our company having paid substantially less than the initial public
offering price when they purchased their shares. The exercise of outstanding
options and warrants will result in further dilution to new investors.

A THIRD PARTY'S ABILITY TO ACQUIRE US MIGHT BE MORE DIFFICULT BECAUSE OF
ANTI-TAKEOVER PROVISIONS IN OUR CERTIFICATE OF INCORPORATION AND BYLAWS.

                                       15
<PAGE>   20

     Upon completion of this offering, we will be authorized to issue five
million shares of undesignated preferred stock. Our Board of Directors will have
the authority to issue the preferred stock in one or more series and to fix the
price, rights, preferences, privileges and restrictions thereof, including
dividend rights, dividend rates, conversion rights, voting rights, terms of
redemption, redemption prices, liquidation preferences and the number of shares
constituting a series or the designation of any series, without any further vote
or action by our stockholders. The issuance of preferred stock, while providing
desirable flexibility in connection with possible acquisitions and other
corporate purposes, could have the effect of delaying, deferring or preventing a
change in control of our company without further action by our stockholders and
may adversely affect the market price of our common stock and the voting and
other rights of our stockholders. The issuance of preferred stock with voting
and conversion rights may adversely affect the voting power of the holders of
our common stock, including the loss of voting control to others. We have no
current plans to issue any shares of preferred stock.

     Provisions of our Restated Certificate of Incorporation and Restated Bylaws
to be in effect upon the completion of this offering eliminate the right of
stockholders to act by written consent without a meeting, eliminate the right of
stockholders to call a special meeting of stockholders, specify procedures for
nominating directors and submitting proposals for consideration at stockholder
meetings and provide for a staggered Board of Directors, so that no more than
approximately one-third of our directors could be replaced each year and it
would take three successive annual meetings to replace all directors. These
provisions are intended to enhance the likelihood of continuity and stability in
the composition of our Board of Directors and in the policies formulated by our
Board of Directors and to discourage some transactions which may involve an
actual or threatened change of control of our company. These provisions are
designed to reduce the vulnerability of our company to an unsolicited
acquisition proposal and, accordingly, could discourage potential acquisition
proposals and delay or prevent a change in control of our company. These
provisions are also intended to discourage tactics that may be used in proxy
fights but could, however, have the effect of discouraging others from making
tender offers for our common stock and, consequently, may also inhibit
fluctuations in the market price of our common stock that could result from
actual or rumored takeover attempts. These provisions may also have the effect
of preventing changes in the management of our company.

WE DO NOT PLAN TO PAY DIVIDENDS IN THE FORESEEABLE FUTURE.

     We have never declared or paid cash dividends on our capital stock. We do
not anticipate paying any cash dividends on our capital stock in the foreseeable
future. We currently intend to retain all available funds and any future
earnings to fund the development and growth of our business. Investors seeking
cash dividends should not purchase our common stock.

                                       16
<PAGE>   21

                           FORWARD-LOOKING STATEMENTS

     We have made statements under the captions "Prospectus Summary," "Risk
Factors," "Management's Discussion and Analysis of Financial Condition and
Results of Operations" and "Business" and in other sections of this prospectus
that are forward-looking statements. In some cases, you can identify these
statements by forward-looking words such as "intend," "may," "might," "will,"
"should," "expect," "plan," "anticipate," "believe," "estimate," "predict,"
"potential" or "continue," the negative of these terms and other comparable
terminology. These forward-looking statements, which are subject to risks,
uncertainties and assumptions about us, may include, among other things,
projections of our future financial performance, our anticipated growth
strategies and anticipated trends in our business. These statements are only
predictions based on our current expectations and projections about future
events. Because these forward-looking statements involve risks and
uncertainties, there are important factors that could cause our actual results,
level of activity, performance or achievements to differ from those expressed or
implied by the forward-looking statements, including those factors discussed
under the caption entitled "Risk Factors." You should specifically consider the
numerous risks outlined under "Risk Factors." Although we believe the
expectations reflected in the forward-looking statements are reasonable, we
cannot guarantee future results, levels of activity, performance or
achievements.

                                       17
<PAGE>   22

                                USE OF PROCEEDS

     Our net proceeds from the sale of       shares of common stock in this
offering will be approximately $       million, or $       million if the
underwriters' over-allotment option is exercised in full, based on an assumed
initial public offering price of $     per share, after deducting underwriting
discounts and commissions and the estimated offering expenses payable by us. We
currently expect to use the net proceeds from this offering as follows:

     - approximately $       to expand our discovery, validation and product
       development capabilities for diagnostic and therapeutic product
       candidates; and

     - the balance for general corporate purposes, including working capital and
       the funding of operating losses.

We may also use a portion of the net proceeds to acquire or invest in
complementary businesses, products and technologies, although we have no current
agreements regarding any material transaction of this sort.

     The principal purposes of this offering are to establish a public market
for our common stock, to increase our visibility in the industry and to
facilitate future access to public capital markets. The amounts that we actually
expend for research and development and general corporate purposes will vary
significantly depending on a number of factors, including the amount of cash
that we generate from operations. As a result, we will retain broad discretion
over the allocation of the net proceeds from this offering. Pending these uses,
we will invest the net proceeds of this offering in short-term, investment grade
securities.

                                DIVIDEND POLICY

     We have never declared or paid cash dividends on our capital stock. We do
not anticipate paying any cash dividends on our capital stock in the foreseeable
future. We currently intend to retain all available funds and any future
earnings to fund the development and growth of our business.

                                       18
<PAGE>   23

                                 CAPITALIZATION

     The table below sets forth our capitalization as of September 30, 2000:

     - on an actual basis;

     - on a pro forma basis giving effect to the automatic conversion of all
       outstanding shares of preferred stock on a one-for-one basis into
       22,025,807 shares of common stock immediately prior to the completion of
       this offering; and

     - on a pro forma as adjusted basis giving effect to the sale of
       shares of common stock in this offering at an assumed initial public
       offering price of $     per share, after deducting underwriting discounts
       and commissions and the estimated offering expenses payable by us.

     You should read this information in conjunction with "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
our financial statements and the related notes included elsewhere in this
prospectus.

<TABLE>
<CAPTION>
                                                                    AS OF SEPTEMBER 30, 2000
                                                              ------------------------------------
                                                                                        PRO FORMA
                                                               ACTUAL     PRO FORMA    AS ADJUSTED
                                                              --------    ---------    -----------
                                                               (IN THOUSANDS, EXCEPT SHARE DATA)
<S>                                                           <C>         <C>          <C>
Long-term liabilities, less current portion.................  $     57    $     57       $   57
                                                              --------    --------       ------
Stockholders' equity:
  Series A preferred stock, $0.01 par value, 4,400,000
     shares authorized, issued and outstanding actual; no
     shares authorized, issued or outstanding pro forma and
     pro forma as adjusted..................................        44          --
  Series B preferred stock, $0.01 par value, 4,400,000
     shares authorized, issued and outstanding actual; no
     shares authorized, issued or outstanding pro forma and
     pro forma as adjusted..................................        44          --
  Series C preferred stock, $0.01 par value, 13,500,000
     shares authorized and 13,225,807 shares issued and
     outstanding actual; no shares authorized, issued or
     outstanding pro forma and pro forma as adjusted........       132          --
  Preferred Stock, $0.01 par value, no shares authorized,
     issued or outstanding, actual and pro forma, 5,000,000
     shares authorized, no shares issued and outstanding pro
     forma as adjusted......................................        --          --
  Common stock, $0.01 par value, 50,000,000 shares
     authorized, actual, pro forma and pro forma as
     adjusted; 207,242 shares issued and outstanding actual;
     22,233,049 shares issued and outstanding pro forma;
     100,000,000 shares authorized, issued and outstanding
     pro forma as adjusted..................................         2         222
  Additional paid-in capital................................   105,896     105,896
  Deferred stock compensation...............................    (5,193)     (5,193)
  Accumulated other comprehensive income (loss).............        (6)         (6)
  Deficit accumulated during the development stage..........    (5,231)     (5,231)
                                                              --------    --------       ------
     Total stockholders' equity.............................    95,688      95,688
                                                              --------    --------       ------
     Total capitalization...................................  $ 95,745    $ 95,745       $
                                                              ========    ========       ======
</TABLE>

     The foregoing excludes, as of September 30, 2000:

     - 2,287,250 shares of common stock issuable upon exercise of options
       outstanding under our 2000 Equity Incentive Plan at a weighted average
       exercise price of $1.05 per share;

     -        shares of common stock issuable upon exercise of options available
       for issuance under our 2001 Equity Incentive Plan;

     - 129,032 shares of common stock issuable upon exercise of a warrant
       outstanding at $7.75 per share; and

     -        shares of common stock available for purchase under our 2001
       Employee Stock Purchase Plan.

                                       19
<PAGE>   24

                                    DILUTION

     As of September 30, 2000, our pro forma net tangible book value was
approximately $95.7 million, or $4.30 per share of common stock. Pro forma net
tangible book value per share represents the amount of our total tangible assets
less total liabilities, divided by the pro forma number of shares of common
stock outstanding. After giving effect to the sale of           shares of common
stock in this offering at an assumed initial public offering price of
$          per share, and after deducting underwriting discounts and commissions
and the estimated offering expenses payable by us, our pro forma as adjusted net
tangible book value as of September 30, 2000 would have been approximately
$          , or $          per share of common stock. This represents an
immediate increase in pro forma as adjusted net tangible book value of
$          per share to our existing stockholders and an immediate and
substantial dilution in pro forma as adjusted net tangible book value of
$          per share to new investors in this offering. If the initial public
offering price is higher or lower, the dilution to new investors will be greater
or less, respectively. The following table summarizes this per share dilution:

<TABLE>
<S>                                                           <C>    <C>
Assumed initial public offering price per share.............         $
  Pro forma net tangible book value per share as of
     September 30, 2000.....................................  $4.30
  Increase per share attributable to new investors..........
                                                              -----
Pro forma as adjusted net tangible book value per share
  after this offering.......................................
                                                                     ------
Dilution in pro forma net tangible book value per share to
  new investors.............................................         $
                                                                     ======
</TABLE>

     The following table summarizes, on a pro forma basis as of September 30,
2000, the differences between the number of shares of common stock issued by us
and the total consideration paid and the average price per share paid by our
existing stockholders and new investors:

<TABLE>
<CAPTION>
                                       SHARES ISSUED            TOTAL CONSIDERATION
                                  ------------------------   -------------------------   AVERAGE PRICE
                                    NUMBER      PERCENTAGE      AMOUNT      PERCENTAGE     PER SHARE
                                  -----------   ----------   ------------   ----------   -------------
<S>                               <C>           <C>          <C>            <C>          <C>
Existing stockholders...........   22,233,049          %     $126,537,940           %        $5.69
New investors...................
                                  -----------     -----      ------------     ------
     Total......................                  100.0%     $                 100.0%
                                  ===========     =====      ============     ======
</TABLE>

     The foregoing discussion and tables exclude, as of September 30, 2000:

     - 2,287,250 shares of common stock issuable upon exercise of options
       outstanding under our 2000 Equity Incentive Plan at a weighted average
       exercise price of $1.05 per share;

     -           shares of common stock issuable upon exercise of options
       available for issuance under our 2001 Equity Incentive Plan;

     - 129,032 shares of common stock issuable upon exercise of a warrant
       outstanding at $7.75 per share; and

     -           shares of common stock available for purchase under our 2001
       Employee Stock Purchase Plan.

     To the extent outstanding options or warrants are exercised, there will be
further dilution to new investors.

                                       20
<PAGE>   25

                            SELECTED FINANCIAL DATA

     The following table sets forth selected financial data for our company. You
should read this information in conjunction with the information under
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and our financial statements and the related notes included
elsewhere in this prospectus.

     In connection with the sale of the Series C Preferred Stock in April 2000,
our company was converted from a limited liability company to a corporation.

     The statement of operations data for the period from August 29, 1997
(inception) through December 31, 1997, the years ended December 31, 1998 and
1999, the nine months ended September 30, 2000 and the cumulative period from
August 29, 1997 (inception) through September 30, 2000 and the balance sheet
data as of December 31, 1998 and 1999 and September 30, 2000 set forth below are
derived from our audited financial statements included elsewhere in this
prospectus. The statement of operations data for the nine months ended September
30, 1999 are derived from our unaudited financial statements included elsewhere
in this prospectus. The balance sheet data as of December 31, 1997 are derived
from our audited financial statements not included in this prospectus. Our
unaudited financial statements have been prepared on the same basis as our
audited financial statements and, in the opinion of management, reflect all
adjustments, which include only normal recurring adjustments, necessary to
fairly present our results of operations for the unaudited interim period. The
results of operations for the nine months ended September 30, 2000 are not
necessarily indicative of our results for the year ending December 31, 2000 or
any future period.

<TABLE>
<CAPTION>
                                                    FOR THE                                                       CUMULATIVE
                                                  PERIOD FROM                                                     PERIOD FROM
                                                   AUGUST 29,                                                     AUGUST 29,
                                                      1997                                                           1997
                                                  (INCEPTION)          YEAR ENDED         NINE MONTHS ENDED       (INCEPTION)
                                                    THROUGH           DECEMBER 31,          SEPTEMBER 30,           THROUGH
                                                  DECEMBER 31,     ------------------   ----------------------   SEPTEMBER 30,
                                                      1997          1998       1999        1999         2000         2000
                                                ----------------   -------   --------   -----------   --------   -------------
                                                                                        (UNAUDITED)
                                                            (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                             <C>                <C>       <C>        <C>           <C>        <C>
STATEMENT OF OPERATIONS DATA:
License revenue...............................       $  --         $    --   $    100     $   100     $     --     $    100
                                                     -----         -------   --------     -------     --------     --------
Operating expenses:
  Research and development (including stock
    compensation expense of $794 for the nine
    months ended September 30, 2000 and for
    the cumulative period from inception
    through September 30, 2000)...............         401           6,761      9,461       7,654        7,182       23,805
  General and administrative (including stock
    compensation expense of $2,183 for the
    nine months ended September 30, 2000 and
    for the cumulative period from inception
    through September 30, 2000)...............         279           1,882      2,345       1,877        3,903        8,409
                                                     -----         -------   --------     -------     --------     --------
Loss from operations..........................        (680)         (8,643)   (11,706)     (9,431)     (11,085)     (32,114)
Interest and other income.....................         132             715        540         565        3,359       (4,746)
Interest expense..............................          --              --       (120)        (49)         (73)        (193)
                                                     -----         -------   --------     -------     --------     --------
Net loss......................................       $(548)        $(7,928)  $(11,286)    $(8,915)    $ (7,799)    $(27,561)
                                                     =====         =======   ========     =======     ========     ========

Basic and diluted net loss per share..........       $  --         $    --   $     --     $    --     $(117.96)
                                                     =====         =======   ========     =======     ========
Shares used to compute net loss per share,
  basic and diluted...........................          --              --         --          --           66

Pro forma net loss per share, basic and
  diluted.....................................                               $  (1.28)                $  (0.45)
                                                                             ========                 ========
Shares used to compute pro forma net loss per
  share, basic and diluted....................                                  8,800                   17,441
</TABLE>

                                       21
<PAGE>   26

<TABLE>
<CAPTION>
                                                                     DECEMBER 31,
                                                              ---------------------------   SEPTEMBER 30,
                                                               1997      1998      1999         2000
                                                              -------   -------   -------   -------------
                                                                            (IN THOUSANDS)
<S>                                                           <C>       <C>       <C>       <C>
BALANCE SHEET DATA:
Cash, cash equivalents and investments......................  $ 6,540   $16,454   $ 8,358      $93,689
Working capital.............................................    3,967    13,301     2,829       70,079
Total assets................................................   10,212    20,215    11,297       97,462
Total liabilities...........................................    2,760     3,681     6,044        1,774
Total members' and stockholders' equity.....................    7,452    16,534     5,253       95,688
</TABLE>

                                       22
<PAGE>   27

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     You should read the following discussion of our financial condition and
results of operations in conjunction with our financial statements and the
related notes included elsewhere in this prospectus. This discussion contains
forward-looking statements that involve risks and uncertainties. Our actual
results and the timing of events could differ materially from those anticipated
in these forward-looking statements as a result of many factors, including those
set forth in the section entitled "Risk Factors" as well as factors described
elsewhere in this prospectus.

OVERVIEW

     We are a post-genomics company focused on translating raw genomics data
into novel diagnostic and therapeutic products. We were founded as a limited
liability company in 1997 by SmithKline Beecham and Incyte. Since our inception,
we have concentrated primarily on the research and development of diagnostic
tests for cancer. Upon our formation, Incyte granted us a fully-paid
subscription to its human and microbial genomics databases, LifeSeq Gold and
PathoSeq, until September 2003. In addition, SmithKline Beecham assigned us its
existing portfolio of diagnostic product candidates as well as the rights to any
additional targets with diagnostic potential discovered in the course of its
pharmaceutical research activities through September 2001, including targets
derived from SmithKline Beecham's collaboration with Human Genome Sciences
through June 2001. These non-cash assets, which represent capital contributions
made in 1997, were recorded at zero value which was equal to the carrying value
of such assets by SmithKline Beecham and Incyte.

     During the second half of 1999 we refocused our research efforts and
discontinued our work on several projects including a diagnostic product
candidate for prostate cancer. We also reduced our total employee workforce by
20 individuals.

     In April 2000, we were incorporated in the State of Delaware as a result of
our conversion from a limited liability company. During 2000 we also expanded
our strategy to include the research and development of therapeutics to treat
cancer. We plan to focus our therapeutic development efforts on monoclonal
antibodies and therapeutic vaccines using the molecular targets we discover.

     We have not achieved profitability on an annual or quarterly basis, and
since our inception have incurred losses totalling $27.6 million. As of
September 30, 2000, we had an accumulated deficit of $5.2 million since our
incorporation in April 2000. We expect to incur additional operating losses as
we continue to develop diagnostic and therapeutic product candidates.

REVENUE RECOGNITION

     To date, we have derived revenue only from a license fee from SmithKline
Beecham Clinical Laboratories. The amount received in 1999 under a
non-refundable license arrangement was recognized when earned as no remaining
performance obligation existed. Any amounts received in advance of completing
the earnings process are recorded as deferred revenue.

STOCK-BASED COMPENSATION

     As of September 30, 2000, we had recorded deferred stock compensation
aggregating $8.2 million for the difference at the date of grant between the
exercise price and the estimated fair value of the common stock underlying stock
options granted in the nine months ended September 30, 2000. Of this amount, we
recognized stock compensation expense of $2.9 million in the nine months ended
September 30, 2000. In addition, we expect to recognize $1.1 million in the
remainder of 2000, $2.5 million in 2001 and $1.7 million in later years. We also
presently expect to recognize additional stock compensation expense related to
option grants made subsequent to September 30, 2000 of approximately $8.3
million to be generally recognized over the vesting periods.

                                       23
<PAGE>   28

INCOME TAXES

     From our inception through April 4, 2000, no provision or benefit for
federal and state income taxes was recorded in our financial statements as we
were a limited liability company and, therefore, taxed as a partnership. Rather,
the federal and state income tax effects of our results of operations were
recorded by our members in their respective income tax returns. On April 4,
2000, in connection with completing the Series C preferred stock financing, we
became subject to the C corporation provisions of the Internal Revenue Code.
Accordingly, any earnings after that date will be taxed at federal and state
corporate income tax rates.

RESULTS OF OPERATIONS

  Nine Months Ended September 30, 2000 Compared to Nine Months Ended September
30, 1999

     License revenue.  License revenue of $100,000 in 1999 consists of revenue
derived from a license agreement we entered into in February 1999 with
SmithKline Beecham Clinical Laboratories, Inc. We recognized no license revenue
for the nine months ended September 30, 2000.

     Research and development expense.  Research and development expense
consists primarily of salaries, laboratory supplies, depreciation of laboratory
equipment and stock compensation expense. Our research and development expense
was approximately $7.2 million for the nine months ended September 30, 2000,
compared with approximately $7.7 million for the nine months ended September 30,
1999, a decrease of $0.5 million, or 7%. The decrease in research and
development expense for the nine months ended September 30, 2000 resulted
primarily from a reduction in expenses related to license fees of $477,000. We
anticipate that our research and development expense will increase substantially
in the future as we discover and develop diagnostic and therapeutic product
candidates. Research and development expense for the nine months ended September
30, 2000 includes $0.8 million of stock compensation expense.

     General and administrative expense.  General and administrative expense
consists primarily of salaries, consultants fees, recruiting and travel expenses
and stock compensation expense. Our general and administrative expense was
approximately $3.9 million for the nine months ended September 30, 2000,
compared with approximately $1.9 million for the nine months ended September 30,
1999, an increase of approximately $2.0 million, or 105%. The increase in
general and administrative expense resulted primarily from stock compensation
expense of $2.2 million for the nine months ended September 30, 2000. We
anticipate that our general and administrative expense will increase as we
expand our corporate development and regulatory staff, add infrastructure and
incur additional costs related to being a public company.

     Interest and other income.  Interest and other income consists primarily of
interest received from our short and long-term investments, and to a lesser
extent, payments from the sublease of a portion of our facilities. Our interest
and other income was approximately $3.3 million for the nine months ended
September 30, 2000, compared with approximately $0.6 million for the nine months
ended September 30, 1999, an increase of approximately $2.7 million, or 415%.
The increase in interest and other income resulted primarily from an increase in
cash equivalents and investments on hand resulting from the private placement
completed in April 2000.

     Interest expense.  Interest expense consists primarily of interest due on
short-term notes payable to SmithKline Beecham and Incyte. Our interest expense
was approximately $73,000 for the nine months ended September 30, 2000, compared
with approximately $49,000 for the nine months ended September 30, 1999, an
increase of approximately $24,000, or 49%. The increase in interest expense
resulted primarily from amounts outstanding under the notes payable to
SmithKline Beecham and Incyte for a longer period of time during the nine months
ended September 30, 2000.

     Income taxes.  For the period from April 2000 through September 30, 2000,
we recorded a net operating loss of $5.2 million.

                                       24
<PAGE>   29

     At September 30, 2000, we had state and federal net operating loss
carryforwards of $1.9 million which expire in 2005 and 2020, respectively, and
federal and state research tax credit carryforwards of $269,000 which expire in
2020. We have provided a full valuation allowance for our deferred tax assets at
September 30, 2000 due to the uncertainty surrounding the future realization of
such assets. Utilization of federal and state net operating loss and tax credit
carryforwards may be subject to an annual limitation due to the "change in
ownership" provisions of the Internal Revenue Code.

  Year Ended December 31, 1999 Compared to Year Ended December 31, 1998

     License revenue.  We recognized license revenue of $100,000 for 1999. We
recognized no license revenue for 1998.

     Research and development expense.  Our research and development expense was
approximately $9.4 million for 1999, compared with approximately $6.8 million
for 1998, an increase of approximately $2.6 million, or 38%. The increase in
research and development expense resulted primarily from a $2.0 million increase
in the cost of sequencing and microarray services purchased from Incyte and, to
a lesser extent, increases in personnel costs as the Company expanded its
operations.

     General and administrative expense.  Our general and administrative expense
was approximately $2.3 million for 1999, compared with approximately $1.9
million for 1998, an increase of approximately $0.4 million or 21%. The increase
in general and administrative expense resulted primarily from higher salary
expense of $0.5 million due to an increase in headcount.

     Interest and other income.  Our interest and other income was approximately
$0.5 million for 1999, compared with approximately $0.7 million for 1998, a
decrease of approximately $0.2 million, or 29%. The decrease in interest and
other income resulted primarily from a reduction in interest bearing cash
equivalents during 1999.

     Interest expense.  Our interest expense was approximately $120,000 for 1999
as a result of the notes payable issued in 1999. We had no interest expense in
1998.

     Income taxes.  For 1999 and 1998, we were a limited liability company and
therefore taxed as a partnership. As a result, the federal and state income tax
effects of our results of operations for 1998 and 1999 were recorded by
SmithKline Beecham and Incyte.

Period From August 29, 1997 (Inception) to December 31, 1997

     During the period from August 29, 1997 (inception) through December 31,
1997, we devoted substantially all of our efforts to recruiting personnel,
financial planning, establishing our facilities and defining our research and
product development strategies. As such, a comparison of the operating results
of that period with the operating results for 1998 would not be meaningful.
Operating expenses of $0.7 million consisted primarily of personnel and facility
costs.

LIQUIDITY AND CAPITAL RESOURCES

     Since inception, we have financed our operations primarily through the
private placement of equity securities, resulting in net cash proceeds of
approximately $126.5 million. In July 1999, we issued notes payable which were
convertible to Series C Preferred Stock in the amount of $2.5 million each to
SmithKline Beecham and Incyte. The notes were due in April 2000, accruing
interest at 5.6% per annum. Upon closing the Series C financing, the note to
SmithKline Beecham was converted to 322,580 shares of Series C Preferred Stock.
Additionally, we paid interest of $97,000 on the note to SmithKline Beecham and
paid Incyte principal of $2.5 million and accrued interest of $97,000. As of
September 30, 2000, we had cash and cash equivalents and investments of $93.7
million.

     Net cash used in operating activities was approximately $4.1 million, $12.9
million and $5.9 million for the nine months ended September 30, 2000 and for
the years ended December 31, 1999 and 1998, respectively. Net cash used in
operating activities for the nine months ended September 30, 2000 consisted

                                       25
<PAGE>   30

primarily of our net loss of $7.8 million, partially reduced by non-cash stock
compensation expense of $3.0 million and depreciation and amortization expense
of $0.8 million. Net cash used in operating activities in 1999 consisted of our
net loss of $11.3 million and changes in working capital of approximately $2.5
million. Cash used in operating activities in 1998 consisted primarily of our
net loss of $7.9 million, partially reduced by non-cash depreciation and
amortization expense of $1.7 million.

     Net cash used in investing activities was approximately $63.1 million, $0.2
million and $1.2 million for the nine months ended September 30, 2000, and for
the years ended December 31, 1999 and 1998, respectively. For the nine months
ended September 30, 2000, our investing activities consisted primarily of
purchases of short-term and long-term securities of $62.5 million. In 1999 and
1998, our investing activities consisted of purchases of property and equipment.

     Net cash provided by financing activities was approximately $90.1 million,
$5.0 million and $17.0 million for the nine months ended September 30, 2000, and
for the years ended December 31, 1999 and 1998, respectively. For the nine
months ended September 30, 2000, our financing activities consisted of the sale
of Series C Preferred Stock to private investors, generating net cash proceeds
of approximately $92.7 million. During the same period, we repaid the principal
and interest on a $2.5 million note payable to Incyte. We converted the
principal on a $2.5 million note payable to SmithKline Beecham to Series C
Preferred Stock, while repaying the interest on the note. In 1999, we received
cash of $2.5 million each from SmithKline Beecham and Incyte under these notes
payable. In 1998 we received $11.0 million in cash from SmithKline Beecham and
$6.0 million in cash from Incyte, respectively.

     In September 1997, we entered into a $5.0 million agreement with Incyte for
microarray services and products and future sequencing services. As of September
30, 2000, we are committed under the agreement to pay Incyte approximately
$402,000 for future sequencing and microarray services and products through
February 2001.

     As part of our business strategy, we intend to invest significant amounts
of capital over the next 12 to 24 months on the research and development of
diagnostic product candidates for cancer and on developing monoclonal antibodies
and therapeutic vaccines to treat cancer using the molecular targets we
discover. This investment could be in the form of direct investment or through
the formation of joint ventures, strategic partnerships or similar collaborative
arrangements.

     Our future capital requirements will depend on many factors, including the
following:

     - our ability to enter into collaborative agreements;

     - competing market developments;

     - cost of filing, prosecuting, defending and enforcing patent claims and
       other intellectual property rights;

     - the purchase of additional capital equipment;

     - our ability to progress our molecular targets and products into the
       diagnostic and therapeutic markets in a timely manner;

     - our ability to obtain FDA approval on our anticipated timeline;

     - the cost of clinical studies.

     We believe that our cash and cash equivalents, short and long-term
investment balances, together with the proceeds of this offering, will be
sufficient to satisfy our cash requirements for at least the next two years. We
intend to invest our excess cash in high quality, interest-bearing securities.

     For the next several years, we do not expect our operations to generate the
amounts of cash required for our future cash needs. In order to satisfy our cash
requirements, we expect to finance future cash needs through the sale of equity
securities, strategic collaborations and perhaps debt financing. We cannot
assure you that additional financing or collaboration and licensing arrangements
will be available when needed or that, if available, will be on terms favorable
to us or our stockholders. Insufficient funds may require us to

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delay, scale back or eliminate some or all of our research or development
programs, to lose rights under existing licenses or to relinquish greater or all
rights to product candidates at an earlier stage of development or on less
favorable terms than we would otherwise choose or may adversely affect our
ability to operate as a going concern. If additional funds are obtained by
issuing equity securities, substantial dilution to existing stockholders may
result.

QUALITATIVE AND QUANTITATIVE DISCLOSURES ABOUT MARKET RISK

     Our investments are subject to interest rate risk and our interest income
may fluctuate due to changes in U.S. interest rates. By policy, we limit our
investments to money market instruments, debt securities of U.S. government
agencies, and debt obligations of U.S. corporations. We manage market risk by
our diversification requirements, which limit the amount of our portfolio that
can be invested in a single issuer. We manage credit risk by limiting our
purchases to high quality issuers.

     All highly liquid investments with a maturity of three months or less from
the date of purchase are considered cash equivalents; investments with a
maturity of three to twelve months from the date of purchase are considered to
be short-term investments; investments with a maturity of more than twelve
months from the date of purchase are considered long-term investments.

RECENT ACCOUNTING PRONOUNCEMENT

     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 133, "Accounting for Derivative Instruments
and Hedging Activities," or SFAS No. 133. SFAS No. 133 establishes new standards
of accounting and reporting for derivative instruments and hedging activities.
SFAS No. 133 requires that all derivatives be recognized at fair value in the
statement of financial position, and that the corresponding gains or losses be
reported either in the statement of operations or as a component of
comprehensive income, depending on the type of hedge transaction. To date, we
have not engaged in derivative or hedging activities. We will adopt SFAS No.
133, as required, in 2001.

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                                    BUSINESS

OVERVIEW

     We are a post-genomics company focused on translating raw genomics data
into novel diagnostic and therapeutic products. We were co-founded in 1997 by
SmithKline Beecham and Incyte Genomics, recognized leaders in genomics and
bioinformatics, to discover molecular targets and develop novel diagnostic
products for the improved detection, classification and prognosis of diseases.
We recently expanded our strategy to include therapeutic discovery and
development. Our initial focus has been on the discovery of novel molecular
targets in cancer. We expect to extend our discovery platform beyond cancer into
other diseases. To date, we have identified thousands of disease-associated
molecular targets, evaluated over 200 potential molecular targets using bioMVP,
our target validation process, and advanced over 40 product candidates into
development, including two diagnostic product candidates in late-stage
preclinical development. We are aggressively seeking patent protection on our
discoveries.

     Upon our formation, SmithKline Beecham assigned us a portfolio of
diagnostic product candidates discovered through their early research efforts.
We have continued the development of eight of these diagnostic product
candidates, including Lp-PLA(2), a novel risk factor for coronary heart disease,
and Cathepsin-K, a diagnostic marker for osteoporosis. We have completed initial
clinical utility studies on Lp-PLA(2) and have commenced initial clinical
utility studies on Cathepsin-K.

     We have an option agreement with Quest Diagnostics, the world's largest
clinical reference laboratory, to license our future products for use in
homebrew tests. We believe the ability to sell our products to clinical
reference laboratories prior to our seeking FDA approval will allow us to assess
demand in the market, increase awareness of our future products and generate
early revenues. Where appropriate, we will seek FDA approval for our diagnostic
products. Eventually, we may license products to large diagnostic companies to
run on their high-throughput testing platforms once significant demand for these
products is established.

INDUSTRY BACKGROUND

     The study of genes and their protein products provides a basis for
understanding disease at the molecular level, powering discoveries that will
potentially lead to novel diagnostic and therapeutic products. In the early
1990s, governments and foundations recognized the potential impact of providing
researchers with the sequence of the human genome and sponsored an intensive
program, which became known as the Human Genome Project, to map and sequence the
human genome. In parallel with the public sector effort, a large private sector
effort emerged in the mid-1990s. In July 2000, public and private researchers
announced that they had completed a rough draft of the complete sequence of the
human genome.

     The total portfolio of approved drugs and diagnostics is currently directed
at approximately 500 protein targets. Genomics is providing an unprecedented
number of new potential targets for diagnostic and therapeutic development.
Scientists now face the challenge of determining which genes and proteins are
implicated in specific diseases.

     We believe that genomics and proteomics fundamentally alter the underlying
economics of diagnostic discovery and, when combined with intellectual property
protection, have the potential to convert the diagnostic industry from its
current status as a generally low margin sector to a higher margin sector based
on patent-protected tests that can command high premiums. We were one of the
first companies to recognize the potential of genomics for diagnostics, and we
believe this first mover advantage is reflected in our product development
pipeline.

     We expect that the distinction between diagnostics and therapeutics will
blur with the emergence of products based on the same molecular target. For
instance, a diagnostic product detecting levels of HER2/neu gene expression is
used in tandem with the drug Herceptin, a monoclonal antibody targeting HER2/neu
gene expression, for the treatment of metastatic breast cancer. We believe this
companion diagnostic/therapeutic approach marks the arrival of a new era of
individualized molecular medicine.

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  DNA, GENES AND PROTEINS

     Deoxyribonucleic acid, or DNA, is present in all living cells. DNA contains
sequences of four distinct types of nucleotide building blocks. A small portion
of DNA contains sequences that are genes. The sequence of nucleotides in genes
comprise the instructions for making proteins.

     The entire DNA content of an organism is called its genome. The human
genome is generally estimated to comprise three billion pairs of nucleotides
that contain the instructions for an estimated 100,000 distinct genes, though
estimates of the total number of human genes range from 40,000 to 100,000. All
cells contain a full copy of DNA, but each cell type "expresses" only those
genes necessary for their specific functions. Genes program a cell by expression
of its sequence into messenger ribonucleic acid, or mRNA, which is used as a
template to direct the synthesis of a protein. Proteins carry out all cellular
activities, such as relaying signals within and between cells and controlling
cellular division.

  DIFFERENTIAL GENE EXPRESSION AND DISEASE

     The activation of a gene is referred to as gene expression. The selective
activation of genes within specific cells is referred to as differential gene
expression. All functions of cells, tissues and organs are controlled by
differential gene expression. Differential gene expression results in the
carefully controlled, or regulated, production of proteins.

     Many diseases arise from the abnormal expression of genes, resulting in the
overproduction or underproduction of proteins or the expression of proteins of
altered chemical composition caused by mutations or other changes in the
nucleotide code for the altered gene. Scientists can compare the expression
levels of genes and proteins in tissue or serum samples of patients with disease
to those of healthy individuals to determine which genes or proteins are altered
in disease. These differences in gene expression or composition of genes or
proteins provide valuable information for the discovery of novel diagnostic and
therapeutic products.

  DIAGNOSTIC TESTING

     Diagnostic tests play a variety of roles in the medical assessment and
therapeutic decision-making process, including alerting the physician to the
presence of a disease and providing critical information necessary to select the
optimum treatment. Diagnostic tests may be performed on blood, urine or tissue
samples.

     The effectiveness of a diagnostic test is defined by its "specificity" and
"sensitivity." Specificity measures a test's ability to correctly identify
individuals who are disease-free. A failure of specificity, known as a "false
positive," is the failure of the test to correctly identify an individual who is
disease-free, and results in a healthy person undergoing unnecessary additional
diagnostic procedures. Sensitivity measures a test's ability to detect the
presence of disease when the patient has disease. A test result that incorrectly
indicates that an affected patient does not have the disease is called a "false
negative," and results in an individual with a disease not being diagnosed or
treated.

     There are several distinct kinds of diagnostic tests:

     - Screening tests are performed on large populations of apparently healthy
       people to help identify disease before symptoms appear. Examples of
       screening tests include the prostate specific antigen, or PSA, test for
       the early identification of prostate cancer, mammograms for breast cancer
       detection and pap smears for cervical cancer detection. To be useful for
       screening large numbers of asymptomatic people, tests must be
       non-invasive and easy to administer. As a result, screening tests are
       typically simple blood-based tests. In addition, screening tests must be
       highly specific to avoid costly follow-up procedures associated with
       false positive diagnoses.

     - Confirmatory tests, such as tissue biopsies, are performed upon
       individuals who already have other test results or symptoms suggesting
       the presence of disease and are used to help confirm the

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       existence of, or rule out, the disease in question. Unlike screening
       tests, confirmatory tests are administered to a relatively small
       population and may require invasive procedures.

     - Monitoring tests, such as the CA-125 blood test for monitoring ovarian
       cancer, are used to measure the recurrence or progression of a disease.
       Monitoring tests are often used repeatedly during treatment, with the
       results of the most recent test being compared to the results of prior
       tests to assess the effectiveness of treatment. For example, rising
       levels of CA-125 may indicate a patient's ovarian cancer is progressing.

     - Pharmacogenomic and pharmacogenetic tests.  Pharmacogenomic tests, such
       as the HER2/neu test administered to breast cancer patients, indicate
       whether patients have a specific sub-type of a particular disease and
       thus aid the physician in prescribing the most appropriate treatment. For
       example, only a certain sub-set of patients with metatstatic breast
       cancer express the HER2 gene. Since Herceptin, a drug used for the
       treatment of metastatic breast cancer, is only approved for patients who
       test positive for HER2/neu expression, the HER2/neu test determines which
       patients are likely to respond to treatment with Herceptin. Similarly,
       pharmacogenetic tests indicate how patients are likely to respond to a
       particular course of therapy because of their individual genetic makeup
       and thus, like pharmacogenomic tests, aid physicians in prescribing the
       most appropriate treatment to optimize drug efficacy and minimize the
       risk of adverse events.

     - Predisposition tests, such as the BRCA-1 test to determine an
       individual's predisposition to breast cancer, classify patients into
       subgroups based on their DNA sequence, rather than their gene expression
       or protein levels. The members of the subgroups have various statistical
       probability of developing a particular disease. In contrast to other
       forms of tests, predisposition tests indicate the possibility of
       developing a disease, rather than the actual presence of the disease.

     New technology will also generate new test formats.  The translation of
genomic information into novel diagnostic products will take place at both the
gene and the protein level. Currently, diagnostic products are primarily single
analyte tests involving the detection of a single gene or protein. We expect new
technologies, such as arrays of genes and/or proteins, will shift the focus away
from the detection of single analytes to the large-scale, parallel testing of
altered expression patterns involving tens, hundreds or perhaps ultimately
thousands of genes and/or proteins in the same multi-analyte test.

  THERAPEUTIC PRODUCTS

     There are four principal categories of drugs: small molecules, secreted
proteins, therapeutic monoclonal antibodies and therapeutic vaccines.

     - Small molecule therapeutics are often orally available, low molecular
      weight organic molecules that interact with a protein in the body to
      either block or enhance its action.

     - Secreted protein therapeutics are naturally occurring proteins or near
      relatives of natural proteins modified in the laboratory that are
      typically administered by intravenous or intramuscular injection.

     - Therapeutic monoclonal antibodies are similar to secreted protein drugs
      in that they are also protein molecules. These antibodies are made to
      specifically bind to target proteins. There are currently eight
      therapeutic antibody products on the market in the United States. These
      products are marketed for a wide range of diseases, including cancer,
      cardiovascular disease, transplant rejection and infectious diseases. We
      believe that antibodies have several potential clinical and commercial
      advantages over traditional therapies. These advantages include the
      following:

        -- faster product development;

        -- fewer unwanted side effects as a result of high specificity for the
           disease target;

        -- greater patient compliance and higher efficacy as a result of
           favorable pharmacokinetics; and

        -- targeted delivery of various payloads, including drugs, radiation and
           toxins, to specific disease sites.

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     - Therapeutic Vaccines.  Historically, vaccines were developed and used to
       induce an immune response in order to prevent diseases. In contrast,
       therapeutic vaccines are administered when the patient already has the
       disease. For a therapeutic vaccine to be effective in fighting disease,
       such as cancer, it is necessary to first identify specific molecular
       targets on the tumor cells, called tumor antigens. The more selective the
       target is to the tumor, the greater the likelihood that the stimulated
       immune response will be directed at attacking only the cancer cells. The
       identification of highly specific tumor-associated antigens has been one
       of the limiting factors in the development of useful cancer vaccines.

OUR STRATEGY

     We aim to be a leader in the emerging field of molecular medicine through
the discovery and development of proprietary molecular targets for diagnostic
and therapeutic applications. To achieve this goal, we intend to:

     - Assemble an integrated, comprehensive platform for molecular target
       discovery and validation.  By aggressively using cutting-edge genomic and
       proteomic technologies, including access to Incyte's LifeSeq Gold
       database, we have put in place a discovery and development program that
       has already yielded a pipeline of over 40 disease-associated molecular
       targets. We will continue to bolster our discovery efforts by
       continuously adding to our arsenal of target discovery and validation
       technologies.

     - Develop and validate an initial portfolio of proprietary diagnostic
       products that can achieve rapid and broad market penetration utilizing
       existing instrument platforms.  We are focused on the discovery and
       development of novel molecular targets that we believe will fundamentally
       transform the detection of disease by providing high value-added
       information that improves clinical decision making. In particular, we are
       focusing on developing single analyte, serum-based diagnostic tests that
       can measure the presence and levels of disease-associated target
       proteins. We intend to perform preclinical studies to confirm utility in
       everyday medical practice. Further, we plan to leverage these discoveries
       through initial diagnostic products that run on the existing installed
       base of testing instruments in clinical reference laboratories, thereby
       increasing the potential for rapid and broad market penetration.

     - Develop a next generation of diagnostic tests compatible with emerging
       multi-analyte testing platforms.  We believe our discovery program will
       yield multi-analyte tests, or tests that analyze multiple gene and/or
       protein expression, that will more accurately detect and profile a
       patient's disease. Accordingly, we are pioneering a program focused on
       developing multi-analyte tests for use in detecting various types of
       cancer.

     - Focus initially on cancer where there is a large unmet need for better
       diagnostics and therapeutics. The early detection of cancer can greatly
       increase rates of survival, yet there are few reliable diagnostic tests
       for many of the major cancers. We have focused our initial research
       efforts on the discovery of novel molecular targets in cancer. The Incyte
       LifeSeq Gold database is an excellent resource for cancer target
       discovery since it contains information on a large number of cancer
       tissues.

     - Leverage potential diagnostic molecular targets from collaborative
       relationships.  Through our relationships with Incyte through 2003 and
       SmithKline Beecham through September 2001, including SmithKline Beecham's
       relationship with Human Genome Sciences through June 2001, we have access
       to the world's largest genomic databases. We have an exclusive license to
       specified diagnostic intellectual property arising from research and
       development efforts conducted by SmithKline Beecham, including diagnostic
       rights arising from SmithKline Beecham's collaboration with Human Genome
       Sciences. We intend to pursue additional collaborative relationships with
       biotech, pharmaceutical and genomics companies that expand our access to
       potential diagnostic molecular targets.

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     - Partner with key clinical opinion leaders and major diagnostic players to
       accelerate market acceptance of diagnostic products.  We believe that our
       agreement with Quest Diagnostics, the world's largest clinical testing
       laboratory, will speed the sale of our future products into the homebrew
       market thereby generating rapid product awareness and early revenues. We
       plan to work closely with key opinion leaders to perform clinical studies
       that can be published in major peer-review journals. Following the
       successful introduction of our diagnostic products in the homebrew
       market, we can either seek FDA approval to market diagnostic products to
       clinical laboratories and physicians, or license our molecular targets to
       established diagnostic companies who will develop tests utilizing their
       proprietary instrument platforms for FDA approval.

     - Extend molecular target discovery into the development of
       immunotherapeutic products.  In collaboration with leading therapeutic
       monoclonal antibody companies, we intend to develop monoclonal antibodies
       that exploit our novel molecular targets. In the future, we plan to
       collaborate with leading therapeutic vaccine companies to develop
       therapeutic vaccines.

     - Continue to build a strong intellectual property portfolio.  We have
       developed a strong intellectual property portfolio and are aggressively
       seeking patent protection on the utility of molecular targets that we
       determine to be clinically useful. We believe that patents are the
       catalyst for changing the profitability of the diagnostics industry and
       will enable us to capture margins similar to those enjoyed by patented
       therapeutic products.

MOLECULAR TARGET DISCOVERY AND VALIDATION PLATFORM

     We use three approaches to source novel molecular targets. Each of these
methods seeks to find genes and proteins that are differentially expressed in
diseased and healthy tissue or serum. The first is our large-scale,
high-throughput Cancer Lead Automated Search Program, or CLASP, our proprietary
bioinformatics software to search Incyte's LifeSeq Gold database. The second is
our internal discovery program involving the large-scale screening of diseased
and healthy tissues. The third is our alliance with SmithKline Beecham, which
entitles us to diagnostic molecular targets that SmithKline Beecham identifies
as having potential diagnostic value through September 2001, including
diagnostic molecular targets identified through its relationship with Human
Genome Sciences through June 2001.

        [DIAGRAM DISPLAYING THREE SOURCES OF MOLECULAR TARGETS, BIOMVP,
               PRECLINICAL DEVELOPMENT AND FUNCTIONAL VALIDATION]

     Once we have identified a potential molecular target, we confirm that it is
differentially expressed in diseased tissue compared to normal tissue through a
rigorous validation and prioritization process that we call bioMVP. Following
bioMVP, only those molecular targets that meet our criteria for specificity and
sensitivity are advanced to the preclinical development stage. For potential
therapeutic targets, we can then perform functional validation studies to verify
the utility of the molecular target as a candidate for therapeutic product
development.

  MOLECULAR TARGET DISCOVERY

     Database Mining.  We have developed proprietary bioinformatics software to
mine public and private genomic databases to detect differences in gene
expression patterns between healthy and diseased states. The first data mining
tool that we developed was CLASP in 1998, which we use to identify and
prioritize several thousand tissue-specific and cancer-associated molecular
targets. CLASP comprises a set of algorithms that interrogate Incyte's LifeSeq
Gold database to identify genes that are both specific to particular tissue
types as well as differentially expressed in tissues from patients with cancer.
LifeSeq Gold is a catalog of more than six million different expressed sequence
tags, or ESTs, derived from approximately 1,300 normal and diseased tissue
samples from individuals. ESTs are fragments of genetic material derived from
mRNA and provide a good representation of gene expression. Incyte's LifeSeq Gold
database is the leading EST database in the world, and the multiplicity of
samples increases the probability of finding molecular targets that are
representative of the population at large. Equally important

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is that it also contains information about which of these genes are expressed in
various tissues in the body and about the dynamics of expression at baseline,
when stimulated and during disease processes.

     CLASP first sorts the LifeSeq Gold database into over 40 defined tissue
types, such as breast, ovary and prostate. Whereas over half of the diseased
samples in the LifeSeq Gold database are cancer-related, there is considerable
variability in the number of patient samples across different cancers. CLASP
then categorizes each tissue sample by disease state. Disease states include
"healthy," "cancer," "associated with cancer," "other disease" and "other."
These specified disease states allow us to filter out data that might otherwise
confound our ability to identify tissue and cancer-specific molecular targets.
CLASP performs a simultaneous parallel search for genes that are expressed both
(1) selectively in the defined tissue type compared to other tissue types and
(2) differentially in the "cancer" disease state compared to the other disease
states affecting the same, or different, tissues. This sorting is accomplished
by using mathematical and statistical filters that specify the minimum change in
expression levels and the minimum frequency that the differential expression
pattern must be observed across the tissue samples for the gene to be considered
differentially expressed. The CLASP algorithm permits quantification of the
relative abundance of a particular gene in each tissue type and in each disease
state. With this information, the list of potential molecular targets is reduced
to a manageable number that can be examined using our bioMVP target validation
platform to confirm each potential molecular target's association with a tissue
type or cancer. Moreover, CLASP is capable of detecting patterns of expression
of multiple genes that, when examined together, greatly enhance the sensitivity
and specificity of tests compared to the use of a single molecular target alone.

     The LifeSeq Gold database represents a catalog of gene expression in
tissues but does not convey information regarding whether the protein is
expressed in serum. Our data mining approach is therefore indifferent to whether
the target protein may eventually be secreted and found in serum. Following data
mining using CLASP to establish the merits of a molecular target, we utilize a
group of proprietary and public algorithms that analyze gene sequence
information to predict whether the target protein is likely to be secreted or
found on the cell surface. This enables us to carefully select and prioritize
those targets that have greater potential as serum diagnostic tests. The cell
surface markers may be potential therapeutic targets.

     CLASP analysis is conducted on each new release of the LifeSeq Gold
database to interrogate additional ESTs identified in new and existing tissue
samples and new "quality controlled" public sequence data. By repeating CLASP
analyses regularly, we are able to continually increase the probability of
discovering clinically relevant molecular targets.

     Internal Discovery.  A second method for molecular target discovery
involves the direct examination of gene and protein expression in diseased and
healthy tissues. This approach supplements our data mining program and enables
us to:

     - analyze more tissues in several cancers of interest;

     - segregate cancers by the stage of disease allowing us to identify genes
       that are differentially expressed at various stages of disease
       progression;

     - focus on tissues of a specific disease or organ that may be
       under-represented in the LifeSeq Gold database;

     - focus specifically on molecular targets found in serum to facilitate
       development of non-invasive diagnostic tests; and

     - identify genes with minimal gene expression that are less likely to
       appear in the LifeSeq Gold database.

     We use three standard methodologies to examine tissue and serum. The first
method is subtractive hybridization in which genes that are expressed similarly
in both diseased and healthy tissue are removed, thereby isolating the remaining
genes from the diseased tissue for identification and analysis. Through
subtractive hybridization, we have generated several proprietary tissue
libraries from which we have

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identified thousands of disease-associated genes, many of which we believe we
were the first to identify. We are aggressively pursuing intellectual property
filings covering these genes.

     The second method is through the use of microarrays which are glass or
silicon wafers with a large number of known gene fragments attached to their
surface. We probe the microarray with diseased and healthy samples in order to
identify genes that are differentially expressed in diseased tissues. We have
performed hundreds of experiments using Incyte's gene expression microarrays in
various disease states. We recently entered into an agreement with Agilent
Technologies to print custom microarrays in each of our five major cancers of
interest: breast, colon, lung, ovary and prostate cancer. We believe this will
substantially increase our capacity to identify molecular targets.

     The third method involves the use of proteomic technologies to identify
differentially expressed proteins in tissues or serum using either
two-dimensional gel profiling or protein chip technology.

     These analyses are conducted using commercially available tissue samples.
To supplement these public resources, we recently entered into an agreement with
the University of Pittsburgh Medical Center. Under this agreement, mRNA will be
prepared from finely dissected tissues of various types, including colon, lung
and prostate, paired with their detailed patient history. We plan to establish
similar collaborations with additional sources of tissue samples in the future.

     SmithKline Beecham.  Our third source of diagnostic molecular targets is
SmithKline Beecham. As one of our founders, SmithKline Beecham agreed to assign
exclusive diagnostic rights to targets identified through September 2001,
including targets derived from its collaboration with Human Genome Sciences
which ends in June 2001. Upon our formation, we received rights to nine
diagnostic molecular targets from SmithKline Beecham, including Lp-PLA(2), our
most advanced diagnostic product candidate. SmithKline Beecham provides regular
updates on molecular targets with potential diagnostic utility. To date, eight
of our 43 diagnostic molecular target product candidates have come from
SmithKline Beecham. In the past 12 months, SmithKline Beecham has sent us more
than 100 additional targets under this arrangement, and we have progressed two
of these into bioMVP.

  BIOMVP FOR MOLECULAR TARGET VALIDATION

     Once we identify a potential molecular target, we subject it to a rigorous
laboratory validation and prioritization process called bioMVP. We use
quantitative and semi-quantitative polymerase chain reaction, or PCR, to
quantify levels of gene expression in a panel of over 120 tissue types. These
techniques confirm whether potential molecular targets are specific to the
tissue type suggested by the original expression pattern detected at the
discovery stage and have the requisite robust correlation with disease and/or
specific stages in disease progression. If the molecular target meets
specificity and sensitivity criteria, we will progress the molecular target into
reagent development. To date, we have conducted quantitative and
semi-quantitative PCR experiments on more than 200 molecular targets, 43 of
which we have advanced into reagent development. We expect to increase our
throughput in molecular target validation by using custom microarrays. These
microarrays will allow us to measure expression levels of 2,500 molecular
targets of interest in several healthy and diseased tissues.

     Quantitative and Semi-quantitative PCR.  PCR is an amplification technology
for making copies of genetic material. PCR is required because the quantity of
the molecular target in actual tissue samples is too small to measure. By using
PCR, sufficient copies of a molecular target can be made in order to assess
their abundance. Quantitative PCR enables the estimation of the level of gene
expression in a sample by counting the number of copies made over a specified
period of time. Semi-quantitative PCR is similar to quantitative PCR, except
that the number of copies of a molecular target in a sample is assessed by
visual inspection, rather than by counting. As a result, semi-quantitative PCR
can be performed more rapidly than quantitative PCR and is useful for initial
confirmation of differential expression. Semi-quantitative PCR provides a useful
discriminatory filter to reduce the number of targets to be evaluated by
quantitative PCR.

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     The following graph shows the bioMVP analysis for C106, a potential
molecular target for colorectal cancer, in more than 120 tissue samples:

                      [graph of bioMVP analysis for C106]

     C106 was identified in the LifeSeq Gold database using CLASP. We believe
that C106 is a novel molecular marker for cancer, and we have applied for a
patent for diagnostic and therapeutic utility for C106. C106 is expressed almost
exclusively in colon tissue and is over-expressed in a significant number of the
colorectal cancer samples tested (red bars) compared to the normal adjacent
tissue (blue bars) of the same patient. The only sample that shows a small
amount of expression other than colorectal is a liver cancer sample, which upon
further examination was revealed to be a sample from a patient with primary
colorectal cancer that had metastasized to the liver.

     Microarrays.  In our collaboration with Agilent, we have designed custom
microarrays with sequences of 2,500 molecular targets affixed to the surface of
each chip in order to increase the throughput of our molecular target validation
effort. Instead of testing each molecular target separately against each of the
120 healthy and diseased tissue samples, we expect to be able to simultaneously
test 2,500 molecular targets against several tissue types to establish
tissue/organ selective expression of the molecular target and differential
expression of interest in the disease. The output of a microarray experiment
highlights the relative levels of expression of disease in diseased and healthy
tissue in various tissue types. If the molecular target is suitably sensitive
and specific, we perform quantitative PCR to determine the degree of
differential expression and further validate its relevance as a potential
diagnostic and/or therapeutic molecular target.

  REAGENT DEVELOPMENT

     Once a target protein has been selected, we raise polyclonal and monoclonal
antibodies that bind specifically to the protein. Where only a partial sequence
of a target gene is available, we clone the full length gene and express the
protein. The expressed protein is then purified and used to generate antibodies.
The characteristics of the antibodies may be modified in vitro to optimize their
affinity to bind to the protein of interest. The purified protein and antibodies
are then used as key reagents for subsequent assay development for both
diagnostics and therapeutics.

  DIAGNOSTIC PRODUCT DEVELOPMENT

     Assay Development.  Once a molecular target is selected for full product
development, we may develop assays measuring both genes and proteins in serum
and tissue samples. To detect the expression of nucleic acids, such as mRNA, we
produce nucleic acid probes that bind specifically to the molecular target of
interest. We develop immunoassays for the detection of the protein target in
serum and immunohistochemical assays to measure the protein in tissue samples.
In a typical immunoassay, the "capture" antibody binds to the protein and the
"detection" antibody binds to a different portion of the same protein, releasing
a signal. The intensity of the signal quantifies the level of expression of the
protein. Once an assay is configured, it is used to determine if the molecular
target is coding for a protein that is detectable in the serum. If the assay can
successfully detect the protein in the serum, the molecular target is advanced
to preclinical validation studies to determine the clinical utility of the test.

     Diagnostic Preclinical Studies.  A large number of human patient serum
samples are tested for the presence or overabundance of the protein in diseased
and healthy sera. Once sufficient data is available to validate a robust
correlation with disease or stage of disease, we publish our research findings
in peer review journals to enhance awareness within the medical community.

     Diagnostic Clinical Validation and Commercialization.  Once the clinical
utility of a diagnostic molecular target is validated in preclinical studies,
the next step is to make it available through the homebrew market. We believe
that our agreement with Quest Diagnostics will speed the penetration of our
future products into the homebrew market. Provided that we sell our products
only to laboratories qualified under the Clinical Laboratory Improvements Act,
or CLIA, review and approval by the FDA is

                                       35
<PAGE>   40

not required. In addition, these diagnostic tests can be sold for use in
academic and biopharmaceutical laboratories as research diagnostic kits. We
believe that the use of our targets in these markets will help us further define
clinical utility, generate publications in peer review journals and create
market awareness.

     Once a product has been successfully introduced into the homebrew market,
we can pursue FDA approval for these products, either under our own auspices or
in concert with future strategic partners. By making these targets available
through the homebrew market while FDA approval is pending, we believe that we
can accelerate our market penetration once approval is obtained. For those
targets that do not demonstrate clear clinical utility, we will continue to make
them available to the homebrew market as long there is demand.

  THERAPEUTIC PRODUCT DEVELOPMENT

     Our diagnostic discovery process identifies novel molecular targets that
are highly specific to a tissue type and disease state. Some of these molecular
targets are cell-surface or secreted proteins and have the potential to become
targets for both diagnostic and therapeutic products. Other molecular targets
are found within cells and have more limited diagnostic potential. To date, we
have sought patent protection on many molecular targets we have discovered, but
have pursued diagnostic product development only on cell-surface or secreted
proteins due to the higher likelihood that such proteins will be found in serum
and can be developed into diagnostic tests. More recently, we have expanded our
focus to pursue the therapeutic potential of the cell-surface and secreted
proteins we have identified. In the future, we may seek to develop therapeutic
product candidates as therapeutic vaccines based on molecular targets found
within cells.

     Therapeutic preclinical validation.  For molecular targets that are
cell-surface or secreted proteins, we will collaborate with therapeutic
monoclonal anitibody companies to raise therapeutic monoclonal antibodies. If
appropriate, functional validation studies, confirming the localization and
distribution of the protein in various tissue samples, will be followed by
studies to assess the safety and efficacy of these product candidates in animals
and humans. For molecular targets found within cells, we intend to collaborate
with therapeutic vaccine technology companies to develop therapeutic vaccines.
If appropriate, functional validation studies will be followed by studies to
assess the safety and efficacy of these product candidates in animals and
humans.

OUR PRODUCT CANDIDATES

     To date, we have identified several thousand novel, disease-associated
molecular targets using CLASP and are aggressively seeking patent protection for
our discoveries. Of the over 200 molecular targets that have completed bioMVP,
we have advanced 43 targets into reagent development. Our most advanced
diagnostic product candidates are:

  LP-PLA(2) -- A NOVEL RISK FACTOR FOR CORONARY HEART DISEASE

     Our most advanced diagnostic product candidate, Lp-PLA(2), is a novel risk
factor for coronary heart disease discovered by SmithKline Beecham. SmithKline
Beecham assigned exclusive rights to us to develop Lp-PLA(2) as a diagnostic
test. There is a significant need for additional cardiovascular risk factors,
since approximately half of the individuals with coronary artery disease do not
exhibit traditional risk factors, such as high blood pressure or LDL
cholesterol, commonly referred to as "bad" cholesterol.

     In October 2000, The New England Journal of Medicine published the results
of a study on Lp-PLA(2). The study, which used our assay, concluded that the
level of circulating Lp-PLA(2) exhibited a strong correlation with risk of
coronary heart disease, independent of other known risk factors, such as LDL
cholesterol. The study used blood samples collected during the West of Scotland
Coronary Prevention Study, a landmark investigation that led to the approval of
pravastatin for the reduction of LDL cholesterol levels.

                                       36
<PAGE>   41

     The Lp-PLA(2) study examined the cases of 580 men who had suffered adverse
coronary events, such as heart attacks, coronary-artery-bypass surgery or
angioplasty. These individuals were compared with 1,160 case-controlled men who
had not suffered a cardiac event. The comparison was controlled for age and
smoking status. All of the participants were middle-aged, caucasian men with
above-normal LDL cholesterol levels.

     Examining five ranges of Lp-PLA(2) levels, the study found a strong
correlation between Lp-PLA(2) and coronary events, with a p-value of less than
0.001. The risk of an adverse coronary event was approximately two times greater
for individuals with the highest levels of Lp-PLA(2) compared to individuals
with the lowest levels of Lp-PLA(2). Lp-PLA(2) was shown to be a strong risk
factor independent of LDL cholesterol and other recently well-publicized markers
of vascular inflammation, such as C-reactive protein.

     We plan to conduct several additional studies to confirm the clinical
utility of Lp-PLA(2) and to seek FDA approval as a diagnostic product. Future
studies will be designed to accomplish the following objectives:

     - establish and confirm the specificity and sensitivity of the Lp-PLA(2)
       assay;

     - verify the results of the West of Scotland Coronary Prevention Study in a
       broader population;

     - investigate the relationship between Lp-PLA(2) levels and treatment with
       HMG-CoA reductase inhibitors; and

     - investigate the potential correlation between Lp-PLA(2) and surrogate
       endpoints, such as coronary artery calcification and restenosis following
       angioplasty and/or stent insertion.

     We believe that a Lp-PLA(2) diagnostic test will enable physicians to
better identify and confirm individuals at risk for coronary heart disease.
These individuals can be currently treated with diet and exercise regimens, as
well as with drugs, particularly HMG-CoA reductase inhibitors. SmithKline
Beecham has a preclinical program with Lp-PLA(2) as a therapeutic target.
Currently, SmithKline Beecham is progressing drug candidates towards initial
safety trials in human subjects. If SmithKline Beecham successfully develops and
sells this therapeutic to treat patients with high levels of Lp-PLA(2), we
believe this will create significant parallel demand for an Lp-PLA(2) diagnostic
test.

  CATHEPSIN-K -- A DIAGNOSTIC MARKER FOR OSTEOPOROSIS

     Our other advanced diagnostic product candidate, Cathepsin-K, is a
molecular target that shows specific expression in osteoclasts, which are bone
resorbing cells. Cathepsin-K was discovered by SmithKline Beecham researchers
while mining data from a cDNA library made from human osteoclasts, and it is
expressed exclusively in osteoclasts. We have developed an immunoassay that is
currently in preclinical studies to evaluate its utility as a molecular target
for disease states associated with excessive bone resorption, such as
osteoporosis and metastatic prostate cancer. Cathepsin-K may also be used to
monitor patients who are being treated for osteoporosis. SmithKline Beecham has
a preclinical drug research program targeting Cathepsin-K.

  ONCOLOGY

     Our primary research and development focus has been in oncology, where
there is significant unmet clinical need and wide acknowledgement that early
detection dramatically impacts survival. Currently, we have over 40 product
candidates in development for various types of solid tumors and hematopoietic
neoplasms.

     We plan to develop serum-based or other minimally invasive diagnostic tests
that have sufficient sensitivity and specificity to screen asymptomatic
individuals as part of routine physical examination. In addition, we plan to
develop tests for the histological examination of tissue that will more
accurately characterize the disease in terms of stage, grade and aggressiveness
of tumor than traditional methods, thereby facilitating more appropriate
treatment. We also believe that our molecular targets could be useful

                                       37
<PAGE>   42

to detect metastasis and micrometastasis, and we are currently assessing
techniques for using our molecular targets for that purpose.

     The following table shows the number of product candidates at various
stages of our research with respect to various forms of cancer:

<TABLE>
<CAPTION>
                                                        ASSAY
TYPE OF                             REAGENT        DEVELOPMENT AND
CANCER                            DEVELOPMENT    CLINICAL VALIDATION
-------                           -----------    -------------------
<S>                               <C>            <C>
Colorectal......................      10                  1
Breast..........................       7                 --
Lung............................       7                 --
Prostate........................       7                  1
Ovarian.........................       2                 --
Other...........................       3                  3
                                      --                  --
     Total......................      36                  5
                                      ==                  ==
</TABLE>

COMPETITION

     We face competition from other companies in the field of novel molecular
target discovery. Millennium Pharmaceuticals, Inc. through its Predictive
Medicine division, is one of the few companies currently focused on molecular
target discovery for disease detection. Large companies, such as Abbott
Laboratories, Bayer and Roche, have limited in-house programs that focus on the
discovery of molecular targets. However, current investment for research and
development at these companies is geared primarily for instrument development
rather than molecular target discovery, with these companies opting to in-
license molecular targets once preliminary clinical validation has been
demonstrated.

     We also may face competition from cancer diagnostics companies and single
nucleotide polymorphism, or SNP, discovery companies. Cancer diagnostics
companies, such as Fujirebio Diagnostics, formerly Centocor Diagnostics,
Matritech and Exact Corp., are also developing diagnostic tests but have not
subscribed to the leading private genomics databases which cost several millions
of dollars per year in subscription fees. SNP discovery companies, such as DNA
Sciences and Myriad Genetics are focused on the analysis of DNA, determining the
association of a SNP with the predisposition to disease. We focus on the
analysis of gene and protein expression to develop tests that will detect the
early presence of disease, rather than the predisposition of an individual to
disease.

     Diagnostics platform technology companies, such as Ciphergen Biosystems are
using their specific technologies to identify proteins that are involved in
disease. Frequently, these companies are focused on the development of their
platform technology rather than the discovery of novel molecular targets. We
may, in the future, supply the content that will be measured using these
emerging platforms, and therefore view these companies as potential partners.

GOVERNMENT REGULATION

     The FDA and comparable regulatory agencies in foreign countries impose
substantial requirements on the clinical development, manufacture and marketing
of pharmaceutical products and in vitro diagnostic devices. These agencies
regulate research and development activities and the testing, manufacture,
quality control, safety, effectiveness, labeling, storage, record keeping,
advertising and promotion of these products and services. Different centers
within FDA are responsible for regulating these products, depending on whether
the product is considered a pharmaceutical, biologic or medical device.

  DIAGNOSTICS

     The products under development that we intend to sell to reference
laboratories such as Quest Diagnostics are analyte specific reagents, or ASRs,
and are treated as restricted devices under the Federal

                                       38
<PAGE>   43

Food Drug and Cosmetic Act. Most are exempt from premarket notification
requirements, and their sale is limited to certain customers such as clinical
laboratories regulated under CLIA as qualified to perform high complexity
testing, in vitro diagnostics manufacturers and nonclinical laboratories that do
not use the reagents to provide diagnostic information to patients.
Manufacturers and suppliers of ASRs are required to register with FDA, to
conform to FDA's current good manufacturing practices requirements and to comply
with certain reporting and other record keeping requirements.

     Because we do not provide any clinical testing services, we are not
registered under CLIA, although we will have to register with the FDA as an ASR
manufacturer or supplier and comply with other applicable requirements before we
start selling ASRs. However, the clinical reference laboratories to which we
intend to sell reagents for their home brew tests must be CLIA-certified. CLIA
is intended to ensure the quality and reliability of clinical laboratories in
the U.S. by mandating specific standards in the areas of personnel
qualification, administration, participation in proficiency testing, patient
test management, quality control, quality assurance and inspections. The
regulation promulgated under CLIA establishes three levels of diagnostic tests:
(1) waived, (2) moderately complex, and (3) highly complex, and the standards
applicable to a clinical laboratory depend on the level of the tests it
performs. We cannot assure you that the CLIA regulations and future
administrative interpretations of CLIA will not have a materially adverse impact
on us by limiting the potential market for our testing services.

     When we decide to provide in vitro diagnostic tests for broader use, our
products will be subject to additional regulation by the FDA under FDA's
authority to regulate medical devices. In the U.S., medical devices are
classified into one of three classes on the basis of the controls deemed by the
FDA to be necessary to reasonably ensure their safety and effectiveness. Class I
devices are generally subject to general controls, including labeling, premarket
notification and adherence to quality systems regulations, or QSRs, which are
device-specific good manufacturing practices. Class II devices are subject to
general controls and special controls, including performance standards and
postmarket surveillance. Class III devices are subject to most of the previously
identified requirements as well as to premarket approval. Most in vitro
diagnostic devices are regulated as Class I or Class II devices, although
certain diagnostic tests may be classified as Class III devices.

     Before a new device can be introduced in the market, its manufacturer
generally must obtain marketing clearance through either a premarket
notification under Section 510(k) of the Federal Food, Drug and Cosmetic Act or
approval of a premarket approval application, or PMA. A 510(k) premarket notice
demonstrates that the device in question is substantially equivalent to another
legally marketed device that does not require premarket approval. FDA is
supposed to complete its review of a 510(k) notice within 90 days of submission,
but it may request additional data, including clinical information, thus
increasing the time that will be necessary to review the notice. Most Class I
devices and many Class II devices are exempt from the 510(k) requirement.

     If the FDA rejects the 510(k), if the device is not equivalent to a
marketed device or if the use of a 510(k) notice is not otherwise appropriate,
the manufacturer must file a PMA. The PMA process is more complex, costly and
time consuming than the 510(k) clearance procedure. A PMA must be supported by
more detailed scientific evidence than a 510(k), including clinical data to
demonstrate the safety and efficacy of the device. If the device presents a
"significant risk," the sponsor of the trial will have to file an
investigational device exemption, or IDE, prior to commencing clinical trials.
If the FDA approves the IDE application and the institutional review boards, or
IRBs, at the institutions at which the clinical trials will be performed approve
the clinical protocol and related materials, clinical trials may begin at a
specific number of investigational sites with a specific number of patients, as
approved by the FDA. Upon completion of the clinical trials, and assuming that
the sponsor believes that the results indicate that the product is safe and
effective for its intended purpose, the sponsor will file a PMA.

     The FDA is required to review a PMA in 180 days, but it typically requests
additional information and may refer the PMA to an FDA advisory committee for
review. A PMA application can take from one to several years to complete, and
there can be no assurance that any submitted PMA application will ultimately be
approved. Moreover, even when approved, the FDA may limit the indications for
which the

                                       39
<PAGE>   44

product may be marketed or to whom it may be sold. Additionally, there can be no
assurance that the FDA will not request additional information or request the
performance of additional clinical studies after the PMA is approved. We believe
that most, if not all, of our diagnostic test kits will require a PMA.

  THERAPEUTICS

     Although we currently do not intend to market our own therapeutic products,
we may develop products through Phase II before out licensing. Therapeutic
product development is subject to extensive regulation. The process required by
the FDA before a pharmaceutical product or biologic may be marketed in the US
generally involves the following:

     - completion of preclinical laboratory and animal testing;

     - submission of an investigational new drug application, or IND, which must
       become effective before clinical trials in humans may begin;

     - performance of adequate and well controlled human clinical trials to
       establish the safety and efficacy of the proposed drug for its intended
       use; and

     - approval by the FDA of a new drug application, or NDA, if the product is
       a pharmaceutical, or a biologics license application, or BLA, if the
       product is a biologic.

     The testing and approval process requires substantial time, effort, and
financial resources, and we cannot be certain that any approvals for our or any
collaborator's product candidate will be granted in a timely manner, if at all.

     Prior to commencing a clinical trial, a sponsor must submit an IND to the
FDA. The IND will become effective 30 days after receipt by the FDA unless the
FDA within the 30-day period raises concerns or questions about the conduct of
the trial. In that case, the IND sponsor and the FDA must resolve any
outstanding concerns before the clinical trial may begin. The submission of an
IND may not result in FDA authorization to commence a clinical trial. In
addition, an independent institutional review board, or IRB, at each institution
at which a clinical trial is being performed, must review and approve the
clinical protocol before is may begin.

     Human clinical trials are typically conducted in three sequential phases
that may overlap. The FDA, an IRB or the sponsor may suspend a clinical trial at
any time for various reasons, including a belief that the subjects are being
exposed to an unacceptable health risk. These phases generally include the
following: Phase I during which the drug is introduced into healthy human
subjects or occasionally into patients and tested for safety, dose tolerance and
metabolism; Phase II during which the drug is introduced into a limited patient
population to determine the efficacy of the product of specific targeted
diseases, to determine dosage tolerance and optimal dosage and to identify
possible adverse effects and safety risks; and Phase III during which the
clinical trial is expanded to a more diverse patient group in geographically
dispersed clinical trial sites to further evaluate clinical efficacy, optimal
dosage and safety.

     The results of product development, preclinical animal studies and human
clinical studies are submitted to the FDA as part of an NDA or BLA. The FDA may
disapprove the NDA or BLA if the applicable regulatory criteria are not
satisfied or it may require additional clinical data. Once approved, the FDA may
withdraw product approval if compliance with regulatory standards is not
maintained or if problems occur after the product reaches the marketplace. In
addition, the FDA may require post-marketing studies to monitor the effect of
approved products, and may limit further marketing of the product based on the
results of these post-marketing studies. Further, if the sponsor wants to make
changes in a product after FDA approval, a new or supplemental application might
be required.

     Satisfaction of FDA requirements or similar requirements of foreign
regulatory agencies typically takes several years and the actual time required
may vary substantially based upon the type, complexity and novelty of the
product or disease. Government regulation may delay or prevent marketing of
potential products for a considerable period of time and impose costly
procedures upon our activities. Success in early stage clinical trials does not
assure success in later stage clinical trials. Data obtained from clinical

                                       40
<PAGE>   45

activities is not always conclusive and may be susceptible to varying
interpretations that could delay, limit or prevent regulatory approval. Even if
a product receives regulatory approval, later discovery of previously unknown
problems with a product may result in restrictions on the product or even
complete withdrawal of the product from the market.

     We are also subject to various laws and regulations relating to safe
working conditions, laboratory and manufacturing practices, the experimental use
of animals, and the use and disposal of hazardous or potentially hazardous
substances, including radioactive compounds and infectious disease agents used
in connection with our research. Compliance with laws and regulations relating
to the protection of the environment has not had a material effect our capital
expenditures or competitive position. However, the extent of governmental
regulation, which might result from any legislative or administrative action,
cannot be accurately predicted. The FDA has broad regulatory and enforcement
powers, including the ability to levy fines and civil penalties, suspend or
delay issuance of approvals, seize or recall products, and withdraw approvals,
any one or more of which could have material adverse effect upon us.

THIRD PARTY REIMBURSEMENT

     Our products under development will initially be sold directly or
indirectly as testing services to medical institutions, laboratories and
physicians. Medical institutions and physicians will be required to seek
reimbursement for the use of these products and services from third-party
payors, including Medicare, Medicaid and private health insurers and managed
care organizations. As a result, market acceptance of our proposed products may
depend in large part on the extent to which third party payors provide coverage
for the diagnostic tests, drugs or therapeutic vaccines that are developed from
our product candidates and how much they will pay for the tests and therapeutic
products after they are approved.

     Coverage and the level of payment provided by U.S. and foreign third party
payors varies according to a number of factors, including the type of medical
provider, the payor, the location and cost. In the U.S., many private health
care insurance carriers follow the recommendations of the Health Care Financing
Administration, or HCFA, which establishes guidelines for the coverage of
procedures, services and medical equipment and the payment of health care
providers treating Medicare patients. In recent years, it has taken an
increasing amount of time to obtain coverage from HCFA for new medical
technology and to obtain appropriate codes for filing claims, even after that
technology is approved by FDA. While HCFA has recently begun to respond to
pressure to make faster and more reasoned decisions regarding coverage and to
publicize the criteria that it uses to make those decisions, it is too early to
say whether these efforts will have a beneficial effect on reimbursement for our
and our collaborators' product candidates.

     Internationally, healthcare reimbursement systems vary significantly. In
many countries, the government sets the prices that will be paid.

MANUFACTURING

     To date, we have not manufactured any products for clinical or commercial
purposes and do not have any manufacturing facilities, technical capabilities or
the resources to do so. We have no present plans to establish a manufacturing
facility. We intend to utilize contract third-party manufacturers or our
corporate collaborators for the production of material for use in clinical
trials and for the potential commercialization of our future products.

EMPLOYEES

     As of September 30, 2000, we employed 36 full-time employees, including
nine in finance and administration and 27 in research and development. None of
our employees is represented by collective bargaining agreements, and our
management considers its relations with our employees to be good.

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<PAGE>   46

FACILITIES

     We currently lease 30,600 square feet of office and research and
development facilities in Santa Clara, California. Our lease expires in
September 2002. We are currently exploring alternatives which would provide us
with additional space to accommodate our anticipated growth.

LEGAL PROCEEDINGS

     We are not a party to any legal proceedings.

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<PAGE>   47

                                   MANAGEMENT

EXECUTIVE OFFICERS, DIRECTORS AND KEY EMPLOYEES

     Our executive officers, directors and key employees as of November 15, 2000
are as follows:

<TABLE>
<CAPTION>
NAME                                        AGE                     POSITION
----                                        ---                     --------
<S>                                         <C>    <C>
Patrick Plewman...........................  34     Chief Executive Officer, President and
                                                   Chief Operating Officer and Director
Sharon E. Tetlow..........................  41     Vice President, Finance and Chief
                                                   Financial Officer
Mohan S. Iyer.............................  37     Vice President, Business Development
Ronald M. Lindsay, Ph.D...................  53     Vice President, Research & Development and
                                                     Chief Science Officer
Robert L. Wolfert, Ph.D...................  46     Vice President, Diagnostics
George Poste, DVM, Ph.D...................  56     Chairman of the Board of Directors
Louis C. Bock.............................  35     Director
Randy W. Scott, Ph.D......................  43     Director
Tadataka Yamada, M.D......................  55     Director
</TABLE>

     Patrick Plewman has served as our Chief Executive Officer since June 2000,
as a Director since April 2000, as our President since January 2000 and as our
Chief Operating Officer since July 1999. From our inception in August 1997
through June 1999, Mr. Plewman served as our Vice President of Corporate
Development. From 1989 to 1997, Mr. Plewman served in various capacities at
SmithKline Beecham, including most recently as Director, Business
Development -- Molecular Diagnostics. Mr. Plewman holds a B.A. in Chemistry and
Political Science from the University of North Carolina at Chapel Hill and an
M.B.A. from Harvard Business School.

     Sharon E. Tetlow has served as our Vice President, Finance and Chief
Financial Officer since February 1999. From January 1998 to March 1999, Ms.
Tetlow was Chief Financial Officer of Reprogen, Inc., a biotechnology company.
From March 1997 to December 1997, Ms. Tetlow worked as a consultant to C.V.
Therapeutics, Inc., a biotechnology company. From January 1996 to February 1997,
Ms. Tetlow served as the Chief Financial Officer of Terrapin Technologies, Inc.,
a biotechnology company. Ms. Tetlow holds a B.A. in Psychology from the
University of Delaware and an M.B.A. from Stanford University.

     Mohan S. Iyer has served as our Vice President, Business Development since
December 1999 and as Vice President, Research & Development Operations and
Business Development from December 1999 to November 2000. From September 1998 to
December 1999, Mr. Iyer served as our Director of Business Development. From
September 1995 to September 1998, Mr. Iyer was Senior Consultant/Engagement
Manager for The Wilkerson Group, a healthcare consulting company. Mr. Iyer holds
a B.S. in Chemical Engineering from the University of Tennessee, an M.S. in
Biomedical Engineering from Duke University and an M.B.A. from Yale University
School of Management.

     Ronald M. Lindsay, Ph.D. has served as our Vice President, Research and
Development and Chief Science Officer since November 2000. From January 1998,
Dr. Lindsay has served in various roles with Millenium Pharmaceuticals, Inc.,
including Senior Vice President, Biotherapeutics and Vice President, Preclinical
Research and Development, Millenium BioTherapeutics. From February 1989 to
December 1997, Dr. Lindsay served in various roles with Regeneron
Pharmaceuticals Inc., including most recently as Vice President, Neurobiology.
Dr. Lindsay holds a B.S. in Chemistry from the University of Glasgow in Scotland
and a Ph.D. in Biochemistry from the University of Calgary.

     Robert L. Wolfert, Ph.D. has served as our Vice President, Diagnostics
since November 2000. From May 1999 to October 2000, Dr. Wolfert was Vice
President, Research and Development of Atairgin Technologies, Inc., a
biotechnology company. From April 1984 to April 1999, Dr. Wolfert served in
various capacities at Hybritech Incorporated, a diagnostics company, including
most recently as Director of

                                       43
<PAGE>   48

Immunodiagnostics Research. Dr. Wolfert holds a B.A. in Chemistry and Biology
from Cornell University and a Ph.D. in Biochemistry and Immunology from Tufts
University School of Medicine.

     George Poste, DVM, Ph.D. has served as our Chairman of the Board of
Directors since September 1997. Since January 2000, Dr. Poste has served as the
Chief Executive Officer of Health Technology Networks, a healthcare consulting
company. From September 1997 to December 1999, he was the Chief Science and
Technology Officer of SmithKline Beecham. From March 1992 to August 1997, Dr.
Poste was the President, Research and Development, of SmithKline Beecham and he
also served as Director from March 1992 to December 1999. In addition, Dr. Poste
currently serves on the Board of Directors of Maxygen, Illumina, Orchid
Biosciences and Structural GenomiX, where he serves as the Chairman of the Board
of Directors. Dr. Poste holds a Doctorate in Veterinary Medicine and a Ph.D. in
Virology from the University of Bristol in England.

     Louis C. Bock has served as a Director since April 2000. Mr. Bock also
serves as a Managing Director of BA Venture Partners VI, LLC, which is the
general partner of BAVP, L.P. Mr. Bock joined BA Venture Partners in September
1997. Prior to that time, he was employed by Gilead Sciences, a
biopharmaceutical company, where he held positions in research, project
management, business development and sales from November 1992 to September 1997.
He currently serves on the Board of Directors of Dynavax Technologies, Prolinx,
Synthon, Seattle Genetics, Structural GenomiX and Neuron Therapeutics. He holds
a B.S. in Biology from California State University, Chico and an M.B.A. from
California State University, San Francisco.

     Randy W. Scott, Ph.D. has served as a Director since our inception in
September 1997. Dr. Scott is a co-founder of Incyte Genomics, Inc. where he has
served as Chairman since September 2000 and as Director since 1991. From January
1997 to September 2000, he served as President and Chief Scientific Officer of
Incyte. From April 1991 to December 1996, he served as Incyte's Vice President
of Research and Development. He also currently serves on the Board of Directors
of Incyte, Genomic Health, Vocent, iTrenders and Highway Communications. Dr.
Scott holds a B.S. from Emporia State University and a Ph.D. in Biochemistry
from the University of Kansas.

     Tadataka Yamada, M.D. has served as a Director since our inception in
September 1997. Since February 1999, Dr. Yamada has served as Chairman of
Research and Development at SmithKline Beecham Pharmaceuticals. He has also
served as President of SmithKline Beecham Healthcare Services from February 1996
to February 1999. He has served as a member of Board of Directors of SmithKline
Beecham since 1994. Dr. Yamada joined the University of Michigan School of
Medicine as Professor of Internal Medicine in 1983 and served as Chairman of the
Department from 1990 to 1996. Dr. Yamada holds a B.A. in History from Stanford
University and an M.D. from the New York University School of Medicine.

BOARD COMPOSITION

     Our board of directors currently consists of five members. All directors
are elected to hold office until their successors have been elected and
qualified or until their earlier death, resignation, disqualification or
removal.

     Our certificate of incorporation and bylaws that become effective
immediately prior to the completion of this offering provide that our board will
be divided into three classes, Class I, Class II and Class III, with each class
serving staggered three-year terms. The Class I directors will stand for
re-election at the 2001 annual meeting of stockholders. The Class II directors
will stand for re-election at the 2002 annual meeting of stockholders. The Class
III director will stand for re-election at the 2003 annual meeting of
stockholders. Any additional directorships resulting from an increase in the
number of directors will be distributed among the three classes so that, as
nearly as possible, each class will consist of one-third of the directors. This
staggered classification of the board of directors may have the effect of
delaying or preventing changes in control or management.

     There are no familial relationships among any of our directors or executive
officers.

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<PAGE>   49

BOARD COMMITTEES

     Our board of directors has an audit committee and a compensation committee.

     Audit committee.  The audit committee of our board of directors recommends
the appointment of our independent auditors, reviews our internal accounting
procedures and financial statements and consults with and reviews the services
provided by our independent auditors, including the results and scope of their
audit. The audit committee currently consists of                          .

     Compensation committee.  The compensation committee of our board of
directors reviews and recommends to the board the compensation and benefits of
all of our executive officers, administers our stock option plans and
establishes and reviews general policies relating to compensation and benefits
of our employees. The compensation committee currently consists of
                         .

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     None of the members of our compensation committee has at any time been one
of our officers or employees. None of our executive officers currently serves,
or in the past year has served, as a member of the board of directors or
compensation committee of any entity that has one or more executive officers
serving on our board of directors or compensation committee. Prior to the
creation of our compensation committee, all compensation decisions were made by
our full board of directors.

DIRECTOR COMPENSATION

     Our directors do not receive any cash compensation for their services as
directors or members of committees of the board of directors but are reimbursed
for their reasonable expenses incurred in attending meetings of the board of
directors. Our directors are eligible to participate in our 2001 Equity
Incentive Plan and 2001 Equity Incentive Plan and employee-directors will be
able to participate in our 2001 Employee Stock Purchase Plan. Our 2001 Plan
provides for formula grants to our non-employee directors of non-qualified stock
options to purchase 10,000 shares of common stock on the date of each annual
meeting of our stockholders. Formula grants to non-employee directors become
vested at a rate of 1/12 per month, commencing with the month in which they are
granted.

     On January 3, 2000, we entered into a consulting agreement with Dr. George
Poste, Chairman of our Board of Directors, to act as consultant to our company
for a quarterly fee of $20,000, plus travel expenses. The agreement remains in
effect until terminated by either party upon written notice. As of September 30,
2000, we had paid an aggregate of $80,000 to Dr. Poste pursuant to this
consulting agreement.

                                       45
<PAGE>   50

EXECUTIVE COMPENSATION

     The following table presents information regarding compensation paid in
1999 to our Chief Executive Officer and our other highest-paid executive
officers whose total annual salary and bonus exceeded $100,000 for the fiscal
year ended December 31, 1999. These executive officers are referred to as our
"named executive officers" elsewhere in this prospectus. There were no long-term
compensation awards or other compensation awarded to our named executive
officers during fiscal 1999.

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                            LONG-TERM
                                                                           COMPENSATION
                                                 ANNUAL COMPENSATION    ------------------
NAME AND                                         --------------------       SECURITIES        ALL OTHER
PRINCIPAL POSITION                                SALARY      BONUS     UNDERLYING OPTIONS   COMPENSATION
------------------                               ---------   --------   ------------------   ------------
<S>                                              <C>         <C>        <C>                  <C>
Patrick Plewman(a).............................  $176,383    $31,500         325,000                 --
  Chief Executive Officer, President and Chief
  Operating Officer
George Poste, DVM, Ph.D.(b)....................        --         --          25,000                 --
  Chairman
Sharon E. Tetlow(c)............................   150,881         --         150,000                 --
  Vice President, Finance and Chief Financial
  Officer
Mohan S. Iyer..................................   137,083      3,098          97,500                 --
  Vice President, Business Development
William G. Gerber, M.D.(d).....................   129,735     28,099          33,333           $331,250
  Former Chief Executive Officer
David Cooper, M.D., Ph.D.(e)(f)................   142,727     20,000         150,000             37,895
  Former Vice President, Research and
  Development Operations
</TABLE>

---------------
(a) Mr. Plewman has served as our Chief Operating Officer since July 1999 and
    was appointed as our President in December 1999 and Chief Executive Officer
    in June 2000.
(b) Dr. Poste served as our acting Chief Executive Officer from July 1999 to
    June 2000.
(c) Ms. Tetlow joined us in February 1999.
(d) Dr. Gerber resigned in July 1999. He received $331,250 in separation
    payments.
(e) Dr. Cooper resigned in May 2000. He received a housing and travel allowance
    of $37,895.
(f) Drs. Lindsay and Wolfert joined us in November 2000.

                                       46
<PAGE>   51

OPTION GRANTS DURING THE FISCAL YEAR ENDED DECEMBER 31, 1999

     The following table provides information relating to stock options awarded
to each of our named executive officers during the year ended December 31, 1999.
All such options were awarded under our 2000 Equity Incentive Plan. In
accordance with the rules of the SEC, the following table sets forth the
potential realizable value over the term of the options based on assumed rates
of stock appreciation of 5% and 10% compounded annually. The term of the options
are the period from the grant date to the expiration date, or 10 years. These
amounts do not represent our estimate of future stock price performance. Actual
realizable values, if any, of stock options will depend on the future
performance of the common stock.

                               INDIVIDUAL GRANTS

<TABLE>
<CAPTION>
                                                                                    POTENTIAL REALIZABLE
                                        PERCENT OF                                    VALUE AT ASSUMED
                         NUMBER OF         TOTAL                                   ANNUAL RATES OF SHARE
                        SECURITIES        OPTIONS                                  PRICE APPRECIATION FOR
                        UNDERLYING      GRANTED TO      EXERCISE                       OPTION TERM(C)
                          OPTIONS      EMPLOYEES IN     PRICE PER    EXPIRATION    ----------------------
NAME                    GRANTED(A)      FISCAL YEAR     SHARE(B)        DATE          5%           10%
----                    -----------    -------------    ---------    ----------    ---------    ---------
<S>                     <C>            <C>              <C>          <C>           <C>          <C>
Patrick Plewman.......    325,000          31.7%          $0.75         2009
George Poste, DVM,
  Ph.D. ..............     25,000           2.4            0.75         2009
Sharon E. Tetlow......    150,000          14.6            0.75         2009
Mohan S. Iyer.........     97,500           9.5            0.75         2009
William G. Gerber,
  M.D.(d).............     33,333           3.3            0.75         2009
David Cooper, M.D.,
  Ph.D.(e)(f).........    150,000          14.6            0.75         2009
</TABLE>

---------------
(a) 25% of all options vest after the first year, and the remaining options vest
    at a rate of 1/48 per month.
(b) The exercise price per share of each option was equal to the fair market
    value of our common stock on the date of grant as determined by our Board of
    Directors.

(c) Potential realizable values are computed by (1) multiplying the number of
    shares of common stock subject to a given option by the assumed initial
    public offering price of $     per share, (2) assuming that the aggregate
    stock value derived from that calculation compounds at the annual 5% or 10%
    rate shown in the table for the entire ten-year term of the option, and (3)
    subtracting from that result the aggregate option exercise price. The 5% and
    10% assumed annual rates of stock price appreciation are mandated by the
    rules of the SEC and do not represent our estimate or projection of future
    common stock prices.
(d) Dr. Gerber resigned in July 1999. Upon his resignation, he was permitted to
    exercise options covering 113,889 shares of our common stock.
(e) Dr. Cooper resigned in May 2000. Upon his resignation, he was permitted to
    exercise options covering 5,000 shares of our common stock.
(f) Drs. Lindsay and Wolfert joined us in November 2000.

                                       47
<PAGE>   52

OPTIONS EXERCISED DURING THE FISCAL YEAR ENDED DECEMBER 31, 1999 AND OPTION
VALUES AS OF DECEMBER 31, 1999

     The following table sets forth information for each of our named executive
officers concerning option exercises for the fiscal year ended December 31, 1999
and vested and unvested options held at December 31, 1999. The value realized
upon exercise and the value of unexercised in-the-money options shown have been
calculated on the basis of the assumed initial public offering price of $
per share, less the applicable exercise price per share, multiplied by the
number of shares underlying these options.

<TABLE>
<CAPTION>
                                                      NUMBER OF SECURITIES
                                                     UNDERLYING UNEXERCISED           VALUE OF UNEXERCISED
                                                         OPTIONS AS OF             IN-THE-MONEY OPTIONS AS OF
                         SHARES                        DECEMBER 31, 1999               DECEMBER 31, 1999
                       ACQUIRED ON     VALUE      ----------------------------    ----------------------------
NAME                    EXERCISE      REALIZED    UNEXERCISABLE    EXERCISABLE    UNEXERCISABLE    EXERCISABLE
----                   -----------    --------    -------------    -----------    -------------    -----------
<S>                    <C>            <C>         <C>              <C>            <C>              <C>
Patrick Plewman......      --            --          234,637         140,363         $               $
George Poste, DVM,
  Ph.D. .............      --            --           37,084           7,916
Sharon E. Tetlow.....      --            --          150,000              --
Mohan S. Iyer........      --            --          113,750           8,750
William G. Gerber
  M.D.(a)............      --            --               --         113,889
David Cooper M.D.,
  Ph.D.(b)(c)........      --            --          150,000              --
</TABLE>

---------------
(a) Dr. Gerber resigned in July 1999. Upon his resignation, he was permitted to
    exercise options covering 113,889 shares of our common stock, all of which
    he exercised in July 2000.
(b) Dr. Cooper resigned in May 2000. Upon his resignation, he was permitted to
    exercise options covering 5,000 shares of our common stock.
(c) Drs. Lindsay and Wolfert joined us in November 2000.

EMPLOYMENT CONTRACTS, CHANGE OF CONTROL ARRANGEMENTS AND SEVERANCE AGREEMENTS

     We routinely deliver written offer letters containing provisions on salary,
bonuses, relocation payments, benefits and stock option grants to prospective
members of management and other employees.

     We have entered into an employment agreement with each of our executive
officers. Under these employment agreements, we agree to pay an annual base
salary to each of our executive officers and to make each of them eligible for
an incentive bonus. The base salaries for Mr. Plewman, Ms. Tetlow, Mr. Iyer and
Dr. Lindsay are $245,000, $184,000, $164,000 and $250,000, respectively. The
employment agreements provide that each of our executive officers is employed
"at-will" and the employment relationship may be terminated for any reason at
any time. If the executive officer terminates his or her employment with us
because of a reduction in his or her base salary or title, because we relocate
the executive or because we have materially breached the employment agreement,
or if we terminate the executive without cause, we must pay the executive a
severance payment of one year's base salary. In addition, all of Mr. Plewman's
stock options would immediately vest and become exercisable upon any of such
events. Our executive officers other than Mr. Plewman will become immediately
vested in their stock options only if any of such events occur within 12 months
following a change of control of our company.

     George Poste, DVM, Ph.D.  Dr. Poste began serving as our acting Chief
Executive Officer in July 1999, and in December 1999, Dr. Poste entered into a
consulting agreement to serve as our acting Chief Executive Officer and
consultant for a quarterly fee of $20,000 plus travel expenses. Although Dr.
Poste no longer serves as acting Chief Executive Officer, he continues to
provide consulting services to us, and on January 18, 2000, we entered into a
special consulting agreement with Dr. Poste to act as a consultant to our
company in connection with our Series C Preferred Stock financing for a daily
fee of $5,000, plus travel expenses. As of September 30, 2000, we had paid an
aggregate of $15,000 to Dr. Poste

                                       48
<PAGE>   53

pursuant to this special consulting agreement. This agreement remains in effect
until terminated by either party upon written notice.

     William G. Gerber, M.D.  In September 1999, Dr. Gerber entered into a
separation agreement with us in conjunction with the termination of his
employment relationship. Pursuant to the terms of the agreement, we paid Dr.
Gerber a lump sum payment of $331,250 and allowed him to exercise options to
purchase 113,889 shares of our common stock.

STOCK PLANS

     2000 Equity Incentive Plan.  Our 2000 Equity Incentive Plan provides for
the grant of incentive stock options to employees, including officers and
employee directors, and for the grant of non-qualified stock options and stock
purchase rights to employees, directors and consultants. Our 2000 Plan was
adopted by our Board of Directors in April 2000. Under the 2000 Plan, a total of
4,700,000 shares of common stock has been reserved for issuance, of which
options to acquire 2,287,250 shares have been issued and were outstanding as of
September 30, 2000, and a total of 207,042 shares have been issued and were
outstanding as of September 30, 2000 pursuant to the exercise of options granted
under our 2000 Plan. No further grants will be made under the 2000 Plan after
               , 2001, provided that the shares that remain reserved for
issuance as of                , 2001, or that become available for issuance as a
result of stock options expiring or becoming unexercisable after
, 2001, under our 2000 Plan may be issued under our 2001 Equity Participation
Plan.

     Prior to this offering, the 2000 Plan may be administered by our Board of
Directors, or a committee thereof. Following this offering, a committee of our
Board of Directors shall administer the 2000 Plan, provided that the committee
consist solely of two or more members of our Board of Directors, each of whom is
an "outside director" within the meaning of Section 162(m) of the Code and a
"non-employee director" within the meaning of Rule 16b-3 of the Securities
Exchange Act of 1934, as amended. The administrator of our 2000 Plan has the
power to determine, among other things:

     - the fair market value of our common stock;

     - the selection of the officers, consultants and employees to whom the
       options and stock purchase rights may from time to time be granted;

     - the number of shares to be covered by each option and stock purchase
       right granted under the 2000 Plan;

     - the form of agreement for use under the 2000 Plan;

     - the terms and conditions of any option or stock purchase right granted
       under the 2000 Plan, including but not limited to, the exercise price and
       any accelerated vesting provisions;

     - whether to buy out previously granted options;

     - the rules and regulations relating to the 2000 Plan;

     - whether to permit 2000 Plan participants to have us withhold from shares
       issuable upon exercise of options or stock purchase rights shares having
       a value equal to the statutory minimum withholding amount;

     - to amend any option or stock purchase right; and

     - to construe and interpret the terms of the 2000 Plan and awards granted
       under the 2000 Plan.

Our Board of Directors may amend, alter, suspend or discontinue the 2000 Plan at
any time. However, this action will not affect the rights of previously granted
options or stock purchase rights unless there is a written agreement to that
effect signed by the option holder or stock purchase right holder and our
company.

                                       49
<PAGE>   54

     Our 2000 Plan provides that upon any changes in our capitalization, the
number of shares subject to each option and stock purchase right and the shares
reserved under our 2000 Plan, as well as the per share exercise price of
outstanding options will be adjusted appropriately by the 2000 Plan
administrator. In the event any dividend or other distribution (whether in the
form of cash, our common stock, other securities, or other property),
recapitalization, reclassification, stock split, reverse stock split,
reorganization, merger, consolidation, split-up, spin-off, combination,
repurchase, liquidation, dissolution, or sale, transfer, exchange or other
disposition of all or substantially all of our assets, or exchange of our common
stock or other securities, issuance of warrants or other rights to purchase our
common stock or other securities, or other similar corporate transaction or
event, the 2000 Plan administrator may provide for the purchase of any option or
restricted stock; may provide that outstanding options become fully vested; may
provide that options and restricted stock be assumed by the successor or
survivor corporation, or a parent or subsidiary thereof, or be substituted for
by similar options, rights or awards covering the stock of the successor or
survivor corporation, or a parent or subsidiary thereof, with appropriate
adjustments as to the number and kind of shares and prices; or may adjust the
number and type of shares subject to outstanding options, and the terms,
conditions of and criteria included in, outstanding options or restricted stock;
and may provide that upon the consummation of such event, outstanding options
shall become fully vested and then terminate.

     In the case of restricted stock purchased upon exercise of an unvested
option or a stock purchase right, unless the administrator determines otherwise,
the restricted stock purchase agreement will grant us a repurchase option
exercisable upon the termination of the purchaser's employment or consulting
relationship with our company for any reason, including death or disability. The
purchase price for shares repurchased pursuant to a restricted stock purchase
agreement may be the original price paid by the purchaser. The repurchase option
will lapse at a rate determined by the administrator. Options and stock purchase
rights granted under our 2000 Plan are generally not transferable by the
optionee, and each option and stock purchase right is exercisable during the
lifetime of the optionee only by the optionee. Options granted under our 2000
Plan must generally be exercised within three months after the end of the
optionee's status as an employee, director or consultant, or within one year
after the optionee's termination by disability or death, respectively, but in no
event later than the expiration of the option's term.

     2001 Equity Incentive Plan.  Our 2001 Equity Incentive Plan was adopted by
our Board of Directors in                and was approved by our stockholders in
               as a successor equity plan to our 2000 Equity Incentive Plan.
Under the 2001 Plan, a total of                shares of common stock have been
reserved for issuance, including shares that remained reserved for issuance
under our 2000 Plan as of                , 2001. In addition, shares that become
available for issuance as a result of stock options expiring or becoming
exercisable under our 2000 Plan after                , 2001 may be issued under
our 2001 Plan.

     Our 2001 Plan provides for the grant of incentive stock options to
employees, including officers and employee directors, and for the grant of
non-qualified stock options and stock purchase rights to employees, directors
and consultants. Our 2001 Plan provides that we cannot issue options or stock
purchase rights after the tenth anniversary of the date on which the 2001 Plan
was adopted by our Board of Directors.

     Our 2001 Plan may be administered by our Board of Directors or a committee
thereof. Following this offering, a committee of our Board of Directors shall
administer our 2001 Plan, provided that the committee consist solely of two or
more members of our Board of Directors, each of whom is an "outside director"
within the meaning of Section 162(m) of the Code and a "non-employee director"
within the meaning of Rule 16b-3 of the Securities Exchange Act of 1934, as
amended.

     The administrator of our 2001 Plan has the power to determine, among other
things:

     - the fair market value of our common stock;

     - the selection of the officers, consultants and employees to whom the
       options and stock purchase rights may from time to time be granted;

                                       50
<PAGE>   55

     - the number of shares to be covered by each option and stock purchase
       right granted under the 2001 Plan;

     - the form of agreement for use under the 2001 Plan;

     - the terms and conditions of any option or stock purchase right granted
       under the 2001 Plan, including but not limited to the exercise price and
       any accelerated vesting provisions;

     - whether to buy out previously granted options;

     - the rules and regulations relating to the 2001 Plan;

     - whether to permit 2001 Plan participants to have us withhold from shares
       issuable upon exercise of options or stock purchase rights shares having
       a value equal to the statutory minimum withholding amount;

     - to amend any option or stock purchase right; and

     - to construe and interpret the terms of the 2001 Plan and awards granted
       under the 2001 Plan.

     Our 2001 Plan provides for formula grants to our non-employee directors of
non-qualified stock options to purchase 10,000 shares of common stock on the
date of each annual meeting of our stockholders. Formula grants to non-employee
directors become vested at a rate of 1/12 per month, commencing with the month
in which they are granted.

     In the case of restricted stock purchased upon exercise of an unvested
option or a stock purchase right, unless the administrator determines otherwise,
the restricted stock purchase agreement will grant us a repurchase option
exercisable upon the termination of the purchaser's employment or consulting
relationship with our company for any reason, including death or disability. The
purchase price for shares repurchased pursuant to a restricted stock purchase
agreement may be the original price paid by the purchaser. The repurchase option
will lapse at a rate determined by the administrator. Options and stock purchase
rights granted under the 2001 Plan are generally not transferable by the
optionee, and each option and stock purchase right is exercisable during the
lifetime of the optionee only by the optionee. Options granted under the 2001
Plan must generally be exercised within three months after the end of the
optionee's status as an employee, director or consultant, or within one year
after the optionee's termination by disability or death, respectively, but in no
event later than the expiration of the option's term.

     The 2001 Plan provides that upon any changes in our capitalization the
number of shares subject to each option and stock purchase right and the shares
reserved under the 2001 Plan, as well as the per share exercise price of
outstanding options will be adjusted appropriately by the 2001 Plan
administrator. In the event any dividend or other distribution (whether in the
form of cash, our common stock, other securities, or other property),
recapitalization, reclassification, stock split, reverse stock split,
reorganization, merger, consolidation, split-up, spin-off, combination,
repurchase, liquidation, dissolution, or sale, transfer, exchange or other
disposition of all or substantially all of our assets, or exchange of our common
stock or other securities, issuance of warrants or other rights to purchase our
common stock or other securities, or other similar corporate transaction or
event, the 2001 Plan administrator may provide for the purchase of any option or
restricted stock; may provide that outstanding options become fully vested; may
provide that options and restricted stock be assumed by the successor or
survivor corporation, or a parent or subsidiary thereof, or be substituted for
by similar options, rights or awards covering the stock of the successor or
survivor corporation, or a parent or subsidiary thereof, with appropriate
adjustments as to the number and kind of shares and prices; or may adjust the
number and type of shares subject to outstanding options, and the terms,
conditions of and criteria included in, outstanding options or restricted stock;
and may provide that upon the consummation of such event, outstanding options
will become fully vested and then terminate.

     The 2001 Plan also provides that without regard to the discretionary
actions described above, in the event of a change of control of our company,
including our merger with or into another entity, if outstanding options, stock
purchase rights and shares of restricted stock are not assumed or substituted
for

                                       51
<PAGE>   56

by the successor entity, the option, stock purchase right and restricted stock
shall automatically become fully vested prior to the change of control, and will
then terminate.

     Employee Stock Purchase Plan.  Our 2001 Employee Stock Purchase Plan was
adopted by our Board of Directors in                and was approved by our
stockholders in                . A total of                shares of common
stock may be sold under the Purchase Plan, plus an annual increase to be added
on each anniversary of the Purchase Plan's adoption during the term of the
Purchase Plan equal to the lesser of           shares or      % of the
outstanding shares on such date or a lesser amount determined by our Board of
Directors. As of the date of this prospectus, no shares have been issued under
the Purchase Plan. The Purchase Plan, which is intended to qualify under Section
423 of the Internal Revenue Code, contains consecutive offer periods that are
generally 24 months in duration. The offer periods start on                and
ends on the last day of                of each year, except for the first offer
period, which will commence on the date immediately preceding the first date on
which a share of common stock is traded on an exchange or quoted on Nasdaq or a
successor quotation system and end on                . Each offer period is
comprised of four consecutive six-month purchase periods. Employees are eligible
to participate if they are customarily employed by us or any participating
subsidiary for at least twenty hours per week. However, no employee may be
granted a right to purchase stock under the Purchase Plan (1) to the extent
that, immediately after the grant of the right to purchase stock, the employee
would own, or be treated as owning, stock possessing 5% or more of the total
combined voting power or value of all classes of our capital stock or (2) to the
extent that his or her rights to purchase stock under all of our employee stock
purchase plans accrues at a rate which exceed $25,000 worth of stock for each
calendar year.

     The Purchase Plan permits participants to purchase common stock through
payroll deductions of up to 20% of the participant's base compensation. Base
compensation is defined as the participant's total compensation which he or she
receives on each payday as compensation for services to our company. The maximum
number of shares a participant may purchase with respect to a single purchase
period is                shares. Amounts deducted and accumulated by the
participant are used to purchase shares of common stock at the end of each
purchase period. The price of stock purchased under the purchase plan is 85% of
the lesser of the fair market value of the common stock (1) the first day of the
purchase period or (2) the last day of the purchase period. Participants may end
their participation at any time and they will be paid their payroll deductions
without interest to date. Participation ends automatically upon termination of
employment with our company.

     Rights to purchase stock granted under the Purchase Plan are not
transferable by a participant other than by will, the laws of descent and
distribution, or as otherwise provided under the Purchase Plan. The Purchase
Plan provides that, in the event of a merger of our company with or into another
corporation or a sale of substantially all of our assets, each outstanding right
to purchase stock may be assumed or substituted for by the successor
corporation. Our Board of Directors has the authority to amend or terminate the
Purchase Plan. However, no action by our Board may adversely affect any
outstanding rights to purchase stock under the Purchase Plan, except that our
Board may terminate an offer period on any exercise date if our Board determines
that the termination of the Purchase Plan is in the best interests of diaDexus
and our stockholders. Unless sooner terminated by our Board of Directors, the
Purchase Plan will terminate on the tenth anniversary of its adoption.

401(k) PLAN

     In January 1998, we adopted a retirement savings and investment plan, or
401(k) plan, covering our eligible full-time employees located in the United
States. The 401(k) plan is intended to qualify under Section 401(k) of the
Internal Revenue Code of 1986, as amended, so that contributions to the 401(k)
plan by employees are not taxable to employees until withdrawn from the 401(k)
plan. Pursuant to the 401(k) plan, participating employees may elect to reduce
their current compensation by up to the lesser of 15% of their annual
compensation or the statutorily prescribed annual limit ($10,500 in 2000), and
to have the amount of the reduction contributed to the 401(k) plan. The 401(k)
plan permits discretionary

                                       52
<PAGE>   57

company matching and profit sharing contributions by our company. To date, we
have not made any contributions to the 401(k) plan on behalf of any of our
employees.

LIMITATION OF LIABILITY AND INDEMNIFICATION OF OFFICERS AND DIRECTORS

     Following the completion of this offering, provisions in our restated
certificate of incorporation and restated bylaws will limit or eliminate the
personal liability of our directors for a breach of their fiduciary duty of care
as a director. The duty of care generally requires that, when acting on behalf
of the corporation, directors exercise an informed business judgment based on
all material information reasonably available to them. Consequently, a director
will not be personally liable to us or our stockholders for monetary damages or
breach of fiduciary duty as a director, except for liability for:

     - any breach of the director's duty of loyalty to us or our stockholders;

     - any act or omission not in good faith or that involve intentional
       misconduct or a knowing violation of law;

     - any act related to unlawful stock repurchases, redemptions or other
       distributions or payment of dividends; or

     - any transaction from which the director derived an improper personal
       benefit.

     These limitations of liability do not affect the availability of equitable
remedies such as injunctive relief or rescission. Our certificate of
incorporation also authorizes us to indemnify our officers, directors and other
agents to the full extent permitted under Delaware law.

     Following the completion of this offering, our restated bylaws will provide
that:

     - we are required to indemnify our directors and officers to the fullest
       extent permitted by the Delaware General Corporation Law, subject to
       limited exceptions;

     - we may indemnify our other employees to the same;

     - we are required to advance expenses, as incurred, to our directors and
       officers in connection with a legal proceeding to the fullest extent
       permitted by the Delaware General Corporation Law, subject to limited
       exceptions; and

     - the rights provided in our bylaws are not exclusive.

     We have entered, and intend to continue to enter, into separate
indemnification agreements with each of our directors and officers which in
certain respects are broader than the specific indemnification provisions
contained in the Delaware General Corporation Law. These indemnification
agreements require us, among other things, to indemnify our officers and
directors against liabilities that may arise by reason of their status or
service as directors or officers. These indemnification agreements also require
us to advance any expenses incurred by the directors or officers as a result of
any proceeding against them as to which they could be indemnified and to obtain
directors' and officers' insurance if available on reasonable terms.

     At present, there is no pending litigation or proceeding involving any of
our directors, officers, employees or agents in which indemnification by us is
sought, nor are we aware of any threatened litigation or proceeding that may
result in a claim for indemnification.

     We intend to purchase a policy of directors' and officers' liability
insurance that insures our directors and officers against the cost of defense,
settlement or payment of a judgment in some circumstances.

                                       53
<PAGE>   58

              CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS

     Since our inception, there has not been, nor is there currently planned,
any transaction or series of similar transactions to which we were or are a
party in which the amount involved exceeds $60,000 and in which any director,
executive officer or holder of more than 5% of our capital stock or any member
of their respective immediate families had or will have a direct or indirect
material interest other than agreements which are described under the caption
"Management" and the transactions described below.

CERTAIN TRANSACTIONS

     On September 2, 1997, we entered into a Master Strategic Relationship
Agreement with Incyte and SmithKline Beecham. Under this agreement, SmithKline
Beecham Corporation and Incyte contributed cash in the amounts of $15.0 million
and $10.0 million, respectively, and other property to form diaDexus, LLC, our
predecessor limited liability company. Under this agreement, we issued 4,400,000
units of diaDexus LLC, the predecessor to our company, to each of SmithKline
Beecham and Incyte at a price per unit of $3.41 and $2.27, respectively. Each of
SmithKline Beecham's units was converted to one share of Series A Preferred
Stock and each of Incyte's units was converted to one share of Series B
Preferred Stock upon our conversion from a limited liability company to a
Delaware corporation immediately prior to the closing of our Series C Preferred
Stock offering in April 2000.

     We entered into a Collaboration and License Agreement with SmithKline
Beecham Corporation, SmithKline Beecham plc and Incyte on September 2, 1997 and
amendments to the agreement on February 17, 2000 and March 30, 2000. Pursuant to
the Collaboration and License Agreement, among other things, each of SmithKline
Beecham Corporation and SmithKline Beecham plc granted to us an exclusive
sublicenseable license under certain of its patents and know-how with respect to
genes and gene products for use as diagnostics through September 2, 2001. We pay
no milestones, royalties or other payments under the Collaboration and License
Agreement but we are obligated to pay pass-through royalties to Human Genome
Sciences, Inc. on sales of products derived from the use of genes discovered by
Human Genome Sciences. In this agreement we committed to expend $5.0 million for
gene sequencing and microarray services from Incyte (including services obtained
under the GEM Services Agreement described below). To date, we have spent
approximately $4.6 million.

     On July 28, 1999, we entered into an amendment to the Collaboration and
License Agreement with SmithKline Beecham Corporation, SmithKline Beecham plc,
Incyte and Quest Diagnostics Incorporated. This amendment transferred to Quest
certain of our rights that we had previously granted to SmithKline Beecham
Clinical Laboratories, which was formerly owned by SmithKline Beecham and is now
owned by Quest. Pursuant to this amendment, we granted to Quest a first right to
license our clinical diagnostic tests before FDA approval is obtained. These
rights continue in effect until September 2, 2005.

     On December 11, 1997 SmithKline Beecham Corporation assigned to us its
rights and obligations under the lease agreement for our company offices in
Santa Clara County.

     On September 28, 1998, we entered into a Service Agreement with SmithKline
Beecham. Under this agreement, SmithKline Beecham provided us personnel support
to identify diagnostic leads and research for a period of one year. In exchange,
we paid SmithKline Beecham a total of $200,000.

     We entered into a GEM Services Agreement with Incyte on November 1, 1998,
and an Amendment to the GEM Services Agreement on September 1, 1999, pursuant to
which we obtain gene preparation and expression services for generating gene
expression information and data from Incyte. The GEM Services Agreement expired
on November 1, 2000.

     On February 10, 1999, we entered into a License Agreement with SmithKline
Beecham Clinical Laboratories, Inc. Pursuant to the License Agreement, we
granted to SmithKline Beecham Clinical Laboratories an exclusive right and
license to make, use and sell as a homebrew a prostate cancer test. In exchange,
we received a license fee of $100,000, and we have the right to receive fixed
royalties on future sales of homebrews. On July 28, 1999, this agreement was
assigned to Quest Diagnostics. This agreement

                                       54
<PAGE>   59

is effective until February 10, 2004 unless terminated earlier in accordance
with the terms of the agreement, and Quest may extend this agreement for three
additional periods of one year each.

     On March 31, 1999, we repaid to SmithKline Beecham $2.2 million for certain
leasehold improvements originally paid by them upon our formation.

     On July 28, 1999, we entered into a bridge loan with each of SmithKline
Beecham and Incyte. Each bridge loan required us to repay an aggregate principal
amount of $2.5 million (or $5.0 million total), together with interest on the
unpaid balance from July 28, 1999 until April 28, 2000 unless earlier converted
into shares of Series C Preferred Stock. On April 6, 2000, SmithKline Beecham
converted the bridge loan into 322,580 shares of Series C Preferred Stock and we
paid accrued interest of approximately $97,000. We concurrently repaid Incyte's
bridge loan in full.

     In December 1999, we entered into a LifeArray Software License Agreement
with Incyte. Under this agreement, we use computer software from Incyte for the
processing and analysis of microarray expression data for a period of 12 months,
which we can extend for an additional 12 month term. The licensing fee for the
use of the software is $75,000 per year.

     On February 17, 2000, we entered into a Collaborative Agreement with Incyte
to retroactively replace and expand our rights that existed in two prior, now
expired, collaborative agreements that were both entered into on September 2,
1997. Pursuant to this Collaborative Agreement, we have access to Incyte's human
database, LifeSeq Gold and microbial database, PathoSeq, at no subscription cost
until September 2, 2003. As with other database subscribers, this Collaborative
Agreement grants us non-exclusive access to database products and database
patents for research, the diagnostic field of use, and the pharmaceutical field
of use. We have an option to exclusively license certain Incyte patents in the
pharmaceutical field of use. We pay Incyte milestones and royalties on the sale
of diagnostic and therapeutic products.

     On April 6, 2000, we sold 13,225,807 shares of our Series C Preferred Stock
for $7.75 per share to 77 accredited investors who were not affiliated with our
company. Such investors, as well as our founders SmithKline Beecham and Incyte,
were granted registration rights with respect to their shares of preferred
stock. See "Description of Capital Stock -- Registration Rights." Entities
affiliated with American Express, BA Venture Partners, Moore Capital, Brookside
Capital Partners and Rho Management respectively acquired 2,387,096, 1,548,387,
1,419,354, 967,741 and 903,225 Series C shares, each of which positions
constituted more than five percent of the total Series C shares issued.

     We have entered into indemnification agreements with certain of our
officers and directors containing provisions which may require us to, among
other things, indemnify our officers and directors against certain liabilities
that may arise by reason of their status or service as officers or directors and
to advance their expenses incurred as a result of any proceeding against them as
to which they could be indemnified. For a description of limitations of
liability and certain indemnification arrangements with respect to our directors
and officers, see "Management -- Limitation of Liability and Indemnification of
Officers and Directors."

                                       55
<PAGE>   60

                             PRINCIPAL STOCKHOLDERS

     The following table presents information concerning the beneficial
ownership of the shares of our common stock as of September 30, 2000, by:

     - each person we know to be the beneficial owner of 5% of more of our
       outstanding shares of common stock;

     - each of our named executive officers;

     - each of our directors; and

     - all of our executive officers and directors as a group.

     Beneficial ownership is determined under the rules of the SEC and generally
includes voting or investment power over securities. Except in cases where
community property laws apply or as indicated in the footnotes to this table, we
believe that each stockholder identified in the table possesses sole voting and
investment power over all shares of common stock shown as beneficially owned by
the stockholder. Percentage of beneficial ownership is based on 22,233,049
shares of common stock outstanding as of September 30, 2000, and          shares
of common stock outstanding after the completion of this offering. The
information set forth in the table gives effect to the automatic conversion of
all outstanding shares of preferred stock into shares of common stock
immediately prior to the completion of this offering. Shares of common stock
subject to options that are currently exercisable or exercisable within 60 days
of September 30, 2000, are considered outstanding and beneficially owned by the
person holding the options for the purpose of computing the percentage ownership
of that person but are not treated as outstanding for the purpose of computing
the percentage ownership of any other person. Unless indicated below, the
address of each individual listed below is c/o diaDexus, Inc., 3303 Octavius
Drive, Santa Clara, California 95054.

<TABLE>
<CAPTION>
                                                                               PERCENTAGE OF SHARES
                                                             NUMBER OF              OUTSTANDING
                                                               SHARES       ---------------------------
                                                            BENEFICIALLY    PRIOR TO THIS    AFTER THIS
BENEFICIAL OWNER                                               OWNED          OFFERING        OFFERING
----------------                                            ------------    -------------    ----------
<S>                                                         <C>             <C>              <C>
Patrick Plewman(1)........................................     215,625             *                 *
Sharon E. Tetlow(2).......................................      65,625             *                 *
Mohan S. Iyer(3)..........................................      40,155             *                 *
George Poste DVM, Ph.D.(4)................................      20,833             *                 *
  Health Technology Networks
  2338 Casmar Way
  Gilbertsville, PA 19525
Randy W. Scott, Ph.D.(5)..................................   4,400,100          19.8%
  3174 Porter Drive
  Palo Alto, CA 94304
Tadataka Yamada, M.D.(6)..................................   4,728,930          21.3
  One Franklin Plaza
  Philadelphia, PA 19101-7929
Louis C. Bock(7)..........................................   1,548,387           7.0
  c/o BAVP, L.P.
  950 Tower Lane
  Foster City, CA 94404
All directors and officers as a group (8 persons)(8)......  11,019,655          49.6
SmithKline Beecham Corporation(9).........................   4,722,680          21.2
  One Franklin Plaza
  Philadelphia, PA 19101-7929
Incyte Genomics, Inc.(10).................................   4,400,100          19.8
  3174 Porter Drive
  Palo Alto, CA 94304
</TABLE>

                                       56
<PAGE>   61

<TABLE>
<CAPTION>
                                                                               PERCENTAGE OF SHARES
                                                             NUMBER OF              OUTSTANDING
                                                               SHARES       ---------------------------
                                                            BENEFICIALLY    PRIOR TO THIS    AFTER THIS
BENEFICIAL OWNER                                               OWNED          OFFERING        OFFERING
----------------                                            ------------    -------------    ----------
<S>                                                         <C>             <C>              <C>
Entities affiliated with American Express(11).............   2,387,096          10.7
  c/o American Express Financial Corporation
  733 Marquette Avenue
  Minneapolis, MN 55402
Entities affiliated with Bank of America Venture
  Partners(12)............................................   1,548,387           7.0
  c/o BAVP, L.P.
  950 Tower Lane
  Foster City, CA 94404
Entities affiliated with Moore Global Investments(13).....   1,419,354           6.4
  1251 Avenue of the Americas -- 53rd Floor
  New York, NY 10020
</TABLE>

---------------
  *  Less than 1%.

 (1) Consists solely of options to purchase 215,625 shares of common stock at an
     average exercise price of $0.68 per share.

 (2) Consists solely of options to purchase 65,625 shares of common stock at an
     exercise price of $0.75 per share.

 (3) Consists solely of options to purchase 40,155 shares of common stock at an
     average exercise price of $0.62 per share.

 (4) Consists solely of options to purchase 20,833 shares of common stock at an
     average exercise price of $0.61 per share.

 (5) Includes 4,400,100 shares held by Incyte. Dr. Scott is a co-founder and
     Chairman of the Board of Directors of Incyte and as such may be deemed to
     share voting and investment power with respect to such shares. Dr. Scott
     disclaims beneficial ownership of such shares except to the extent of his
     pecuniary interest in such shares.

 (6) Consists solely of options to purchase 6,250 shares of common stock at an
     average exercise price of $0.51 per share. Includes 4,722,680 shares held
     by SmithKline Beecham Corporation. Mr. Yamada is the Chairman, Research and
     Development of SmithKline Beecham Pharmaceuticals and as such may be deemed
     to share voting and investment power with respect to such shares. Mr.
     Yamada disclaims beneficial ownership of such shares except to the extent
     of his pecuniary interest in such shares.

 (7) Includes 1,548,387 shares held by BAVP, L.P. Mr. Bock is a Managing
     Director of BAVP and as such may be deemed to share voting and investment
     power with respect to such shares. Mr. Bock disclaims beneficial ownership
     of such shares except to the extent of his pecuniary interest in such
     shares.

 (8) Consists of securities described in notes 1-7 above.

 (9) Consists of 4,400,000 shares of Series A Preferred Stock, 322,580 shares of
     Series C Preferred Stock and 100 shares of common stock.

(10) Consists of 4,400,000 shares of Series B Preferred Stock and 100 shares of
     common stock.

(11) Consists of 477,419 shares of Series C Preferred Stock held by IDS Life
     Series Fund, Inc., 795,698 shares of Series C Preferred Stock held by AXP
     Strategy Series, Inc. and 1,113,979 shares of Series C Preferred Stock held
     by AXP Variable Portfolio, Inc.

(12) Consists of 1,548,387 shares of Series C Preferred Stock held by BAVP, L.P.

(13) Consists of 877,419 shares of Series C Preferred Stock held by Moore Global
     Investment, LTD, 322,581 shares of Series C Preferred Stock held by
     Remington Investment Strategies, L.P. and 219,354 shares of Series C
     Preferred Stock held by Moore Global Fixed Income Fund, LTD.
                                       57
<PAGE>   62

                          DESCRIPTION OF CAPITAL STOCK

     The following is a summary of the rights of our common stock and preferred
stock. This summary is not complete. For more detailed information, please see
our restated certificate of incorporation which is filed as an exhibit to the
registration statement of which this prospectus is a part.

     Upon the completion of this offering, our authorized capital stock will
consist of           shares of common stock, $0.01 par value per share, and five
million shares of preferred stock, $0.01 par value per share.

COMMON STOCK

     As of September 30, 2000, and assuming the conversion of all outstanding
preferred stock into common stock immediately prior to the completion of this
offering, there were 22,233,049 shares of common stock outstanding held by 77
stockholders and options outstanding to purchase 2,287,250 shares of common
stock under our 2000 Equity Incentive Plan and other warrants outstanding to
purchase 129,032 shares of common stock.

     Dividend Rights.  Subject to preferences that may apply to shares of
preferred stock outstanding at the time, the holders of outstanding shares of
common stock are entitled to receive dividends out of assets legally available
at the times and in the amounts as our board of directors may from time to time
determine.

     Voting Rights.  Each common stockholder is entitled to one vote for each
share of common stock held on all matters submitted to a vote of stockholders.
Cumulative voting for the election of directors is not provided for in our
restated certificate of incorporation, which means that the holders of a
majority of the shares voted can elect all of the directors then standing for
election.

     No Preemptive or Similar Rights.  Our common stock is not entitled to
preemptive rights and is not subject to conversion or redemption.

     Right to Receive Liquidation Distributions.  Upon our liquidation,
dissolution or winding-up, the assets legally available for distribution to our
stockholders are distributable ratably among the holders of our common stock and
any participating preferred stock outstanding at that time after payment of
liquidation preferences, if any, on any outstanding preferred stock and payment
of other claims of creditors. Each outstanding share of common stock is, and all
shares of common stock to be outstanding upon completion of this offering will
be, fully paid and nonassessable.

PREFERRED STOCK

     Immediately prior to the completion of this offering, each outstanding
share of our preferred stock outstanding will be converted into one share of
common stock.

     Following the offering, we will be authorized, subject to the limits
imposed by the Delaware General Corporation Law, to issue five million shares of
preferred stock in one or more series, to establish from time to time the number
of shares to be included in each series, to fix the rights, preferences and
privileges of the shares of each wholly unissued series and any of its
qualifications, limitations, restrictions. Our board of directors can also
increase or decrease the number of shares of any series, but not below the
number of shares of that series then outstanding, without any further vote or
action by our stockholders.

     Our board of directors may authorize the issuance of preferred stock with
voting or conversion rights that could adversely affect the voting power or
other rights of our common stockholders. The issuance of preferred stock, while
providing flexibility in connection with possible acquisitions and other
corporate purposes, could have the effect of delaying, deferring or preventing
our change in control and may cause the market price of our common stock to
decline or impair the voting and other rights of the holders of our common
stock. We have no current plans to issue any shares of preferred stock.

                                       58
<PAGE>   63

WARRANTS

     In connection with our sale of Series C Preferred Stock in April 2000, we
issued a warrant to Prudential Securities Incorporated in June 2000 to purchase
129,032 shares of Series C Preferred Stock at an exercise price per share of
$7.75. This warrant may be exercised at any time prior to June 1, 2005. After
the offering, this warrant will automatically convert to a warrant to purchase
common stock.

REGISTRATION RIGHTS

     The holders of approximately 22,025,807 shares of preferred stock have the
right to require us to register their shares with the Securities and Exchange
Commission so that those shares may be publicly resold or to include their
shares in any registration statement we file.

     Demand Registration Rights.  At any time six months after the closing of
this offering the holders of at least 40% of the shares having registration
rights have the right to demand that we file a registration statement so long as
the aggregate amount of securities to be sold under the registration statement
exceeds $7.5 million. If we are eligible to file a registration statement on
Form S-3, the holders of at least 500,000 shares having registration rights have
the right to demand that we file a registration statement on Form S-3.

     Piggyback Registration Rights.  If we register any securities for public
sale, stockholders with registration rights will have the right to include their
shares in the registration statement. The underwriters of any underwritten
offering will have the right to limit the number of shares having registration
rights to be included in the registration statement, but not below 30% of the
total number of shares included in the registration statement, except for this
offering in which the underwriters have excluded any sales by existing
investors.

     Expenses of Registration.  We will all pay expenses relating to any demand
or piggyback registration. However, we will not pay for the expenses of any
demand registration if the request is subsequently withdrawn by the holders of a
majority of the shares having registration rights, subject to very limited
exceptions.

     Expiration of Registration Rights.  The registration rights described above
will expire five years after this offering is completed. The registration rights
will terminate earlier for a particular stockholder if that holder, following
this offering, holds less than 1% of our common stock and such holder can resell
all of its securities in a three-month period under Rule 144 of the Securities
Act.

ANTITAKEOVER EFFECTS OF DELAWARE LAW AND PROVISIONS OF OUR CERTIFICATE OF
INCORPORATION AND BYLAWS

  Delaware Takeover Statute

     We are subject to Section 203 of the Delaware General Corporation Law. This
statute regulating corporate takeovers prohibits a Delaware corporation from
engaging in any business combination with any interested stockholder for three
years following the date that the stockholder became an "interested
stockholder," unless:

     - prior to the date of the transaction, the board of directors of the
       corporation approved either the business combination or the transaction
       which resulted in the stockholder becoming an interested stockholder;

     - the interested stockholder owned at least 85% of the voting stock of the
       corporation outstanding at the time the transaction commenced, excluding
       for purposes of determining the number of shares outstanding (a) shares
       owned by persons who are directors and also officers, and (b) shares
       owned by employee stock plans in which employee participants do not have
       the right to determine confidentially whether shares held subject to the
       plan will be tendered in a tender or exchange offer; or

                                       59
<PAGE>   64

     - on or subsequent to the date of the transaction, the business combination
       is approved by the board and authorized at an annual or special meeting
       of stockholders, and not by written consent, by the affirmative vote of
       at least 66 2/3% of the outstanding voting stock which is not owned by
       the interested stockholder.

     Section 203 defines a "business combination" to include:

     - any merger or consolidation involving the corporation and the interested
       stockholder;

     - any sale, transfer, pledge or other disposition involving the interested
       stockholder of 10% or more of the assets of the corporation;

     - subject to exceptions, any transaction that results in the issuance or
       transfer by the corporation of any stock of the corporation to the
       interested stockholder; or

     - the receipt by the interested stockholder of the benefit of any loans,
       advances, guarantees, pledges or other financial benefits provided by or
       through the corporation.

In general, Section 203 defines an interested stockholder as any entity or
person beneficially owning 15% or more of the outstanding voting stock of the
corporation and any entity or person affiliated with or controlling or
controlled by the entity or person.

  Certificate of Incorporation and Bylaw Provisions

     Provisions of our certificate of incorporation and bylaws which will become
effective upon the closing of this offering may have the effect of making it
more difficult for a third party to acquire, or of discouraging a third party
from attempting to acquire, control of our company. These provisions could cause
the price of our common stock to decrease. Some of these provisions allow us to
issue preferred stock without any vote or further action by the stockholders,
eliminate the right of stockholders to act by written consent without a meeting
and eliminate cumulative voting in the election of directors. These provisions
may make it more difficult for stockholders to take specific corporate actions
and could have the effect of delaying or preventing a change in our control. The
amendment of any of these provisions would require approval by holders of at
least two-thirds of the outstanding common stock.

TRANSFER AGENT AND REGISTRAR

     The transfer agent and registrar for our common stock is

                                       60
<PAGE>   65

                        SHARES ELIGIBLE FOR FUTURE SALE

     Prior to this offering, there has been no public market for our common
stock, and there can be no assurance that a significant public market for our
common stock will develop or be sustained after this offering. Future sales of
substantial amounts of common stock, including shares issued upon exercise of
outstanding options and warrants, in the public market following this offering
could adversely affect market prices prevailing from time to time and could
impair our ability to raise capital through the sale of our equity securities.
Furthermore, since no shares will be available for sale shortly after this
offering because of contractual and legal restrictions on resale described
below, sales of substantial amounts of our common stock in the public market
after the restrictions lapse could adversely affect the prevailing market price
and our ability to raise equity capital in the future.

     Upon completion of this offering, we will have outstanding           shares
of common stock, assuming no exercise of the over-allotment options and no
exercises of outstanding options or warrants. Of these shares, all the shares
sold in this offering, plus any shares issued upon exercise of the underwriters'
over-allotment option, will be freely tradable without restriction or further
registration under the Securities Act, unless purchased by our "affiliates" as
that term is defined in Rule 144 under the Securities Act. The remaining
          shares of common stock outstanding are "restricted securities" within
the meaning of Rule 144 under the Securities Act. Restricted securities may be
sold in the public market only if registered or if they qualify for an exemption
from registration under Rules 144, 144(k) or 701 promulgated under the
Securities Act, which are summarized below.

     As a result of contractual restrictions described below and the provisions
of Rules 144 and 701, the restricted shares will be available for sale in the
public market as follows:

     -           shares will become eligible for sale upon expiration of the
       lock-up agreements described below, beginning 180 days after the date of
       this prospectus;

     -           shares will be eligible for sale upon exercise of vested
       options 180 days after the date of this prospectus; and

     -           shares will be eligible for sale pursuant to Rule 144 beginning
       one year after the date of this prospectus.

LOCK-UP AGREEMENTS

     Our directors, officers and stockholders have entered into lock-up
agreements with the underwriters of this offering generally providing that they
will not offer, sell, contract to sell or grant any option to purchase or
otherwise dispose of our shares of common stock or any securities exercisable
for or convertible into our common stock owned by them prior to this offering
for a period of 180 days after the effective date of the registration statement
filed pursuant to this offering without the prior written consent of Lehman
Brothers Inc.

RULE 144

     In general, under Rule 144 as currently in effect, beginning 90 days after
the date of this prospectus, a person who has beneficially owned restricted
shares for at least one year, including the holding period of any prior owner
except an affiliate, would be entitled to sell within any three-month period a
number of shares that does not exceed the greater of:

     - 1% of the number of shares of common stock then outstanding, which will
       equal approximately           shares immediately after this offering; or

     - the average weekly trading volume of our common stock during the four
       calendar weeks preceding the filing of a Form 144 with respect to such
       sale.

     Sales under Rule 144 are also subject to certain manner of sale provisions
and notice requirements and to the availability of current public information
about us. Under Rule 144(k), a person who is not

                                       61
<PAGE>   66

deemed to have been an affiliate of us at any time during the three months
preceding a sale, and who has beneficially owned the shares proposed to be sold
for at least two years, including the holding period of any prior owner except
an affiliate, is entitled to sell such shares without complying with the manner
of sale, public information, volume limitation or notice provisions of Rule 144.

     Rule 701, as currently in effect, permits resales of shares in reliance
upon Rule 144 but without compliance with certain restrictions, including the
holding period requirement, of Rule 144. Any of our employees, officers,
directors, or consultant who purchased shares under a written compensatory plan
or contract may be entitled to rely on the resale provisions of Rule 701. Rule
701 permits affiliates to sell their Rule 701 shares under Rule 144 without
complying with the holding period requirements of Rule 144. Rule 701 further
provides that non-affiliates may sell such shares in reliance on Rule 144
without having to comply with the holding period, public information, volume
limitation or notice provisions of Rule 144. All holders of Rule 701 shares are
required to wait until 90 days after the date of this prospectus before selling
such shares. However, all Rule 701 shares are subject to lock-up agreements and
will only become eligible for sale at the earlier of the expiration of the
180-day lock-up agreements or no sooner than 90 days after the offering upon
obtaining the prior written consent of Lehman Brothers Inc.

STOCK OPTIONS

     Within 90 days following the effectiveness of this offering, we intend to
file a registration statement on Form S-8 registering approximately
shares of common stock subject to outstanding options or reserved for future
issuance under our 2000 Equity Incentive Plan, our 2001 Equity Incentive Plan
and our 2001 Employee Stock Purchase Plan, based on shares and options
outstanding as of September 30, 2000. As of September 30, 2000, options to
purchase a total of 2,287,250 shares were outstanding and 2,195,708 additional
shares were reserved for future issuance under our 2000 Equity Incentive Plan.
Upon the filing of the registration statement on Form S-8, common stock issued
upon exercise of outstanding options which are not subject to our right of
repurchase or which are issued under our Purchase Plan, other than common stock
issued to our affiliates, will be available for immediate resale in the open
market. Also beginning six months after the date of this offering, holders of
approximately 22,025,807 restricted shares will be entitled to certain
registration rights. See "Description of Capital Stock -- Registration Rights"
for more information regarding these rights. Registration of such shares under
the Securities Act would result in such shares becoming freely tradable without
restriction under the Securities Act, except for shares purchased by affiliates,
immediately upon the effectiveness of such registration.

                                       62
<PAGE>   67

               UNITED STATES TAX CONSEQUENCES TO NON-U.S. HOLDERS

     The following summary of the material United States federal income and
estate tax consequences of the purchase, ownership and disposition of our common
stock by non-U.S. holders is based upon the provisions of the Internal Revenue
Code of 1986, as amended, or the "Code," the United States Treasury regulations,
and rulings and judicial decisions issued with respect thereto, all of which are
subject to change, possibly with retroactive effect, or possible differing
interpretations. Any such change or different interpretation could affect the
continuing validity of this summary.

     A non-U.S. holder is a holder of common stock that is not, for United
States federal income tax purposes, any of the following:

     - a citizen or resident of the United States;

     - a corporation, partnership or other entity created or organized in or
       under the laws of the United States or any of its political subdivisions;

     - an estate, the income of which is subject to United States federal income
       taxation regardless of its source; or

     - a trust (a) whose administration is subject to the primary supervision of
       a United States court and which has one or more United States persons who
       have the authority to control all substantial decisions of the trust, or
       (b) which was in existence on August 20, 1996 and has properly elected to
       continue to be received as a United States person.

     This summary does not discuss all aspects of United States federal taxation
that may be important to a particular non-U.S. holder in light of specific facts
and circumstances relevant to that holder and may not apply to non-U.S. holders
subject to special treatment under applicable United States federal tax law,
including, without limitation, "controlled foreign corporations," "passive
foreign investment companies," "foreign personal holding companies" or certain
United States expatriates. In addition, this discussion does not address the
treatment of any non-U.S. holders under the laws of any state, local, foreign or
other taxing jurisdiction.

     EACH PROSPECTIVE HOLDER IS URGED TO CONSULT ITS TAX ADVISOR WITH RESPECT TO
THE UNITED STATES FEDERAL INCOME AND ESTATE TAX CONSEQUENCES OF ACQUIRING,
HOLDING AND DISPOSING OF OUR COMMON STOCK, AS WELL AS ANY TAX CONSEQUENCES THAT
MAY ARISE UNDER THE LAWS OF ANY STATE, LOCAL OR FOREIGN TAXING JURISDICTION.

DIVIDENDS

     If you are a non-U.S. holder of our common stock, dividends paid to you
will generally be subject to withholding of United States federal income tax at
a 30% rate or a lower rate as may be specified by an applicable income tax
treaty. Under currently effective United States Treasury regulations, for
purposes of determining if dividends are subject to the 30% withholding tax,
dividends paid to an address in a foreign country are presumed to be paid to a
resident of that country, unless the person making the payment has knowledge to
the contrary. Under current interpretations of United States Treasury
regulations, this presumption also applies for purposes of determining whether a
lower withholding rate applies under an income tax treaty.

     Under United States Treasury regulations that will generally apply to
dividends paid after December 31, 2000, or the "Final Withholding Regulations,"
a non-U.S. holder must satisfy certification requirements in order to claim the
benefit of a lower treaty rate. In addition, if the non-U.S. holder is a partner
in a foreign partnership, the holder, as well as the foreign partnership, must
satisfy the certification requirements, and the partnership must provide certain
information, including a taxpayer identification number. A look through rule
will apply in the case of tiered partnerships.

     A non-U.S. holder of common stock that is eligible for a reduced rate of
United States withholding tax under a tax treaty may obtain a refund of any
excess amounts currently withheld by filing an appropriate claim for refund with
the United States Internal Revenue Service.

                                       63
<PAGE>   68

     If the dividends are "effectively connected" with a non-U.S. holder's
conduct of a trade or business within the United States, and, if an income tax
treaty applies, are attributable to a United States permanent establishment of
the non-U.S. holder in the United States, then dividends paid to a non-U.S.
holder will generally not be subject to withholding tax, provided that the
non-U.S. holder complies with applicable certification and disclosure
requirements. Instead, the "effectively connected" dividends will be subject to
United States federal income tax in the same manner as dividends paid to United
States citizens, resident aliens and domestic United States corporations. Any
effectively connected dividends received by a corporate non-U.S. holder may
also, under certain circumstances, be subject to an additional "branch profits
tax" at a 30% rate or a lower rate as may be specified by an applicable income
tax treaty.

GAIN ON DISPOSITION OF COMMON STOCK

     A non-U.S. holder generally will not be required to pay United States
federal income tax with respect to gain recognized on a sale or other
disposition of common stock unless one of the following conditions is satisfied:

     - the gain is effectively connected with the conduct of a trade or business
       in the United States, and, if an income tax treaty applies, is
       attributable to a permanent establishment maintained in the United States
       by the non-U.S. holder;

     - in the case of a non-U.S. holder who is an individual and holds the
       common stock as a capital asset, the holder is present in the United
       States for 183 or more days in the taxable year of the sale or other
       disposition and certain other conditions exist;

     - we are or have been a "United States real property holding corporation"
       for United States federal income tax purposes; or

     - the non-U.S. holder is required to pay tax under certain provisions of
       the Code applicable to United States expatriates.

     Individual non-U.S. holders described in the first bullet point above will
be required to pay tax on the net gain derived from the sale of our common stock
at the regular graduated United States federal income tax rates. Individual
non-U.S. holders described in the second bullet point above will be subject to a
30% tax on the gain derived from the sale or other disposition of our common
stock, which may be offset by United States source capital losses (even though
the non-U.S. holder is not considered a resident of the United States). Amounts
received by corporate non-U.S. holders described in the first bullet point above
may also, under certain circumstances, be subject to an additional "branch
profits tax" at a 30% rate or a lower rate as may be specified by an applicable
income tax treaty.

     We believe we are not currently, and do not anticipate becoming, a "United
States real property holding corporation" for United States federal income tax
purposes. If we were to become a "United States real property holding
corporation," gain recognized by a non-U.S. holder would not be subject to
United States tax if the non-U.S. holder were eligible for a treaty exemption or
if the shares were considered to be "regularly traded on an established
securities market," and the non-U.S. holder did not hold, directly or
indirectly, at any time during the shorter of the periods described above, more
than 5% of our common stock.

FEDERAL ESTATE TAX CONSEQUENCES

     Common stock held by an individual non-U.S. holder at the time of death
will be included in the holder's gross estate for United States federal estate
tax purposes, and may be subject to United States federal estate tax, unless an
applicable estate tax treaty provides otherwise.

INFORMATION REPORTING AND BACKUP WITHHOLDING

     We must report annually to the United States Internal Revenue Service and
to each non-U.S. holder the amount of dividends paid to, and the tax withheld
with respect to, any holder, regardless of whether

                                       64
<PAGE>   69

any tax was actually withheld. This information may also be made available to
the tax authorities in the non-U.S. holder's country of residence.

     Under current law, United States information reporting requirements, other
than reporting of dividend payments for purposes of the withholding tax noted
above, and backup withholding tax generally will not apply to dividends paid to
non-U.S. holders that are either subject to the 30% withholding discussed above
or that are not subject to withholding because an applicable tax treaty reduces
or eliminates the withholding. Otherwise, backup withholding of United States
federal income tax at a rate of 31% may apply to dividends paid with respect to
common stock to holders that are not "exempt recipients" and that fail to
provide certain information including the holder's United States taxpayer
identification number.

     Under current law, unless the payor of dividends has actual knowledge that
the payee is a United States person, the payor generally may treat dividend
payments to a payee with a foreign address as exempt from information reporting
and backup withholding. However, under the Final Withholding Regulations,
dividend payments made after December 31, 2000 generally will be subject to
information reporting and backup withholding unless applicable certification
requirements are satisfied. See the discussion above with respect to the rules
applicable to foreign partnerships under the Final Withholding Regulations.

     In general, United States information reporting and backup withholding
requirements also will not apply to the payment of disposition proceeds where
the transaction is effected through an office outside the United States of a
non-United States broker. However, United States information reporting, but not
backup withholding, will apply to a payment of sales proceeds, even if made
outside the United States, through an office of a broker that is (i) a United
States person, (ii) a foreign person that derives 50% or more of its gross
income for certain periods from the conduct of a trade or business in the United
States, (iii) a "controlled foreign corporation" for United States federal
income tax purposes, or, (iv) in the case of payments made after December 31,
2000, a foreign partnership with certain connections to the United States,
unless the broker has documentary evidence in its records that the holder or
beneficial owner is a non-U.S. person and that certain conditions are met, or
the holder or beneficial owner otherwise establishes an exemption. Payment of
the proceeds of the sale of common stock to or through a United States office of
a broker is currently subject to both United States backup withholding and
information reporting unless the holder certifies its non-U.S. holder status
under penalties of perjury or otherwise establishes an exemption.

     Backup withholding is not an additional tax. Amounts withheld under the
backup withholding rules are generally allowable as a refund or credit against a
non-U-S. holder's federal income tax liability, if any, provided that the
required information is furnished to the Internal Revenue Service.

                                       65
<PAGE>   70

                                  UNDERWRITING

     Under the underwriting agreement, which is filed as an exhibit to the
registration statement relating to this prospectus, the underwriters named
below, for whom Lehman Brothers Inc., CIBC World Markets Corp., Prudential
Securities Incorporated and Fidelity Capital Markets, a division of National
Financial Services, LLC, are acting as representatives, have each agreed to
purchase from us, the respective number of shares of common stock shown opposite
its name below:

<TABLE>
<CAPTION>
                                                                NUMBER OF
UNDERWRITER                                                       SHARES
-----------                                                     ----------
<S>                                                             <C>
Lehman Brothers Inc.........................................
CIBC World Markets Corp.....................................
Prudential Securities Incorporated..........................
Fidelity Capital Markets, a division of National Financial
  Services, LLC.............................................

                                                                ----------
          Total.............................................
                                                                ==========
</TABLE>

     This is a firm commitment underwriting. This means that the underwriters
have agreed to purchase all of the shares offered by this prospectus, other than
those covered by the over-allotment option described below, if any are
purchased. Under the underwriting agreement, if an underwriter defaults in its
commitment to purchase shares, the commitments of non-defaulting underwriters
may be increased or the underwriting agreement may be terminated, depending on
the circumstances.

     We plan to apply for quotation of our common stock on the NASDAQ National
Market under the symbol "DDXS."

COMMISSIONS AND EXPENSES

     The representatives of the underwriters have advised us that the
underwriters propose to offer the common stock directly to the public at the
public offering price on the cover page of this prospectus, and to selected
dealers, who may include the underwriters, at the public offering price less a
selling concession not in excess of $     per share. The underwriters may allow,
and the selected dealers may reallow, a concession not in excess of $     per
share to brokers and dealers. After the completion of this offering, the
underwriters may change the offering price and other selling terms.

     The following table summarizes the underwriting discounts and commissions
we will pay to the underwriters. These amounts are shown assuming both no
exercise and full exercise of the underwriters' over-allotment option to
purchase        additional shares. The underwriting discounts and commissions
are equal to the public offer price per share, less the amount paid to us per
share.

<TABLE>
<CAPTION>
                                                          PAID BY US
                                        ----------------------------------------------
                                           NO EXERCISE OF          FULL EXERCISE OF
                                        OVER-ALLOTMENT OPTION    OVER-ALLOTMENT OPTION
                                        ---------------------    ---------------------
<S>                                     <C>                      <C>
Per Share.............................       $                        $
Total.................................
</TABLE>

                                       66
<PAGE>   71

     We estimate that the total expenses of the offering, including
registration, filing and listing fees, printing fees and legal and accounting
expenses, but excluding underwriting discounts and commissions, will be
approximately $          million.

OVER-ALLOTMENT OPTION

     We have granted to the underwriters an option to purchase up to an
aggregate of        shares of common stock, exercisable solely to cover
over-allotments, if any, at the public offering price less the underwriting
discounts and commissions shown on the cover page of this prospectus. The
underwriters may exercise this option at any time until 30 days after the date
of this prospectus. To the extent the underwriters exercise this option, each
underwriter will be committed, so long as the conditions of the underwriting
agreement are satisfied, to purchase a number of additional shares proportionate
to that underwriter's initial commitment as indicated in the preceding table.

LOCK-UP AGREEMENTS

     We, our directors, officers and other stockholders holding   % of
securities have agreed not, directly or indirectly, to offer for sale, sell,
pledge, or otherwise dispose of any common stock or any securities which may be
converted into or exchanged for any common stock for a period of 180 days from
the date of this prospectus without the prior written consent of Lehman Brothers
Inc. However, shares acquired in the open market or in the directed share
program described below will not be subject to the lock-up agreements, nor will
transfers to immediate family members who agree to be bound by the lock-up
agreements. Lehman Brothers Inc., in its sole discretion, may release the shares
subject to the lock-up agreements in whole or in part at any time with or
without notice. However, Lehman Brothers Inc. has informed us that it has no
current plan to do so.

OFFERING PRICE DETERMINATION

     Prior to this offering, there has been no public market for our common
stock. The initial public offering price will be negotiated between the
representatives and us. In determining the initial public offering price of our
common stock, the representatives will consider:

     - prevailing market conditions;

     - our historical performance and capital structure;

     - estimates of our business potential and earnings prospects;

     - an overall assessment of our management; and

     - the consideration of these factors in relation to market valuation of
       companies in related businesses.

INDEMNIFICATION

     We have agreed to indemnify the underwriters against liabilities relating
to this offering, including liabilities under the Securities Act and liabilities
arising from breaches of the representations and warranties contained in the
underwriting agreement, and to contribute to payments that the underwriters may
be required to make for these liabilities.

STABILIZATION, SHORT POSITIONS AND PENALTY BIDS

     The representatives may engage in over-allotment, stabilizing transactions,
syndicate covering transactions, and penalty bids or purchases for the purpose
of pegging, fixing or maintaining the price of the common stock, in accordance
with Regulation M under the Securities Exchange Act.

     - Over-allotment involves syndicate sales in excess of the offering size,
       which creates a syndicate short position.

                                       67
<PAGE>   72

     - Stabilizing transactions permit bids to purchase the underlying security
       so long as the stabilizing bids do not exceed a specific maximum.

     - Syndicate covering transactions involve purchases of the common stock in
       the open market after the distribution has been completed.

     - Penalty bids permit the representatives to reclaim a selling concession
       from a syndicate member when the common stock originally sold by the
       syndicate member is purchased in a syndicate covering transaction to
       cover syndicate short positions.

     The underwriters may purchase and sell shares of common stock in the open
market. These transactions may include short sales, stabilizing transactions and
purchases to cover positions created by short sales. Short sales involve the
sale by the underwriters of a greater number of shares than they are required to
purchase in the offering. "Covered" short sales are sales made in an amount not
greater than the underwriters' option to purchase additional shares from the
issuer in the offering. The underwriters may close out any covered short
position by either exercising their option to purchase additional shares or
purchasing shares in the open market. In determining the source of shares to
close out the covered short position, the underwriters will consider, among
other things, the price of shares available for purchase in the open market as
compared to the price at which they may purchase shares through-the
over-allotment option. "Naked" short sales are any sales in excess of such
option. The underwriters must close out any naked short position by purchasing
shares in the open market. A naked short position is more likely to be created
if the underwriters are concerned that there may be downward pressure on the
price of the common stock in the open market after pricing that could adversely
affect investors who purchase in the offering. Stabilizing transactions consist
of various bids for or purchases of common stock made by the underwriters in the
open market prior to the completion of the offering.

     Similar to other purchase transactions, the underwriters' purchases to
cover the syndicate short sales may-have the effect of raising or maintaining
the market price of the common stock or preventing or retarding a decline in the
market price of the common stock. As a result, the price of the common stock may
be higher than the price that might otherwise exist in the open market.

     Neither we nor any of the underwriters make any representation or
prediction concerning the direction or magnitude of any effect that the
transactions described above may have on the price of our common stock. In
addition, neither we nor any of the underwriters make any representation that
the representatives will engage in these transactions or that any such
transaction, once commenced, will not be discontinued without notice.

OTHER MATTERS

     Prudential Securities Incorporated, one of the representatives of the
underwriters of this public offering, acted as a placement agent in connection
with our sale of Series C Preferred Stock in April 2000, for which they were
paid customary fees, together with the grant of a warrant to purchase 129,032
shares of Series C Preferred Stock. In addition, employees of Prudential
Securities purchased 29,121 of Series C Preferred Stock.

DISTRIBUTION

     Lehman Brothers Inc. and CIBC World Markets Corp. intend to distribute and
deliver this prospectus only by hand or mail and intend to use only printed
prospectuses. Fidelity Capital Markets, a division of National Financial
Services LLC, is acting as an underwriter of this offering and will be
facilitating electronic distribution through the Internet. One of the
representatives, Prudential Securities Incorporated, also markets online through
its PrudentialSecurities.com division. Clients of Prudential Advisor(SM) may
view offering terms and a prospectus online and place orders through their
financial advisors. Other than the prospectus in electronic format, the
information on this website is not intended to be part of this prospectus or the
registration statement of which this prospectus forms a part, has not been
approved or endorsed by us or any underwriter in such capacity and should not be
relied on by prospective investors.

                                       68
<PAGE>   73

STAMP TAXES

     Purchasers of the shares of our common stock offered by this prospectus may
be required to pay stamp taxes and other charges under the laws and practices of
the country of purchase, in addition of the offering price listed on the cover
of this prospectus.

OFFER AND SALES IN CANADA

     Any offers in Canada will be made only under an exception from the
requirements to file a prospectus in each relevant province of Canada where a
sale is made.

DIRECTED SHARE PROGRAM

     At our request, Lehman Brothers Inc. has reserved up to        shares, or
5% of our common stock offered by this prospectus, for sale under a directed
share program to our officers, directors, employees and to our business
associates. All of the persons purchasing the reserved shares must commit to
purchase no later than the close of business on the day following the date of
this prospectus. The number of shares available for sale to the general public
will be reduced to the extent these persons purchase the reserved shares. Shares
committed to be purchased by directed share participants which are not so
purchased will be reallocated for sale to the general public in the offering.
All sales of shares pursuant to the directed share program will be made at the
initial public offering price set forth on the cover page of this prospectus.

SALES TO DISCRETIONARY ACCOUNTS

     The underwriters have informed us that they do not intend to confirm sales
to discretionary accounts that exceed 5% of the total number of shares of our
common stock offered by them.

                                       69
<PAGE>   74

                                 LEGAL MATTERS

     The validity of the common stock offered hereby will be passed upon for us
by Latham & Watkins, Menlo Park, California. Various legal matters relating to
the offering will be passed upon for the underwriters by Mintz, Levin, Cohn,
Ferris, Glovsky and Popeo, P.C., Boston, Massachusetts. Latham & Watkins and
certain of its partners and employees beneficially own 50,000 shares of our
common stock and 16,772 shares of our preferred stock, all of which will convert
to common stock immediately prior to the completion of this offering.

                                    EXPERTS

     The financial statements as of December 31, 1998, 1999 and September 30,
2000 and for the period from August 29, 1997 (date of inception) to December 31,
1997 and for the two years ended December 31, 1998 and 1999 and for the nine
month period ended September 30, 2000 and for the cumulative period from August
29, 1997 (date of inception) to September 30, 2000, included in this prospectus
have been so included in reliance on the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of said firm as experts in
auditings and accounting.

                      WHERE YOU CAN FIND MORE INFORMATION

     We have filed with the SEC a registration statement on Form S-1 under the
Securities Act that registers the shares of common stock to be sold in this
offering. The registration statement, including the attached exhibits and
schedules, contain additional relevant information about us and our capital
stock. The rules and regulations of the SEC allow us to omit various information
included in the registration statement from this document.

     In addition, upon completion of this offering, we will become subject to
the reporting and information requirements of the Exchange Act and, as a result,
will file periodic reports, proxy statements and other information with the SEC.
You may read and copy this information at the public reference room of the SEC
at 450 Fifth Street, N.W., Room 1024, Washington, DC 20549. You also obtain
copies of this information by mail from the public reference section of the SEC,
450 Fifth St., N.W. Room 1024, Washington, DC 20549, at prescribed rates.

     The SEC also maintains an internet website that contains reports, proxy
statements and other information about issuers, like us who file electronically
with the SEC. The address of that website is www.sec.gov.

     We intend to furnish our stockholders with annual reports containing
audited financial statements, and make available to our stockholders quarterly
reports for the first three quarters of each fiscal year containing unaudited
interim financial information.

                                       70
<PAGE>   75

                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                         INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Independent Accountants...........................  F-2
Balance Sheets..............................................  F-3
Statements of Operations....................................  F-4
Statements of Members' and Stockholders' Equity.............  F-5
Statements of Cash Flows....................................  F-6
Notes to Financial Statements...............................  F-7
</TABLE>

                                       F-1
<PAGE>   76

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Stockholders
of diaDexus, Inc.

     The two new stock benefit plans described in Note 8 to the financial
statements have not been adopted as of November 20, 2000. When they are adopted
by the Board of Directors, we will be in a position to furnish the following
report:

     "In our opinion, the accompanying balance sheets and the related statements
of operations, of members' and stockholders' equity and of cash flows present
fairly, in all material respects, the financial position of diaDexus, Inc. (a
development stage company) at December 31, 1998, 1999 and September 30, 2000,
and the results of its operations and its cash flows for the period from August
29, 1997 (date of inception) to December 31, 1997 and for the two years ended
December 31, 1998 and 1999, and for the nine months ended September 30, 2000 and
for the cumulative period from August 29, 1997 (date of inception) to September
30, 2000, in conformity with accounting principles generally accepted in the
United States of America. These financial statements are the responsibility of
the Company's management; our responsibility is to express an opinion on these
financial statements based on our audits. We conducted our audits of these
statements in accordance with generally accepted auditing standards in the
United States of America, which require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements, assessing
the accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion."

/s/ PRICEWATERHOUSECOOPERS LLP

San Jose, California
November 20, 2000, except as
to Note 8 which is
as of December      , 2000

                                       F-2
<PAGE>   77

                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                                 BALANCE SHEETS
                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                                                     PRO FORMA
                                                                                                   STOCKHOLDERS'
                                                                 DECEMBER 31,                        EQUITY AT
                                                              ------------------   SEPTEMBER 30,   SEPTEMBER 30,
                                                               1998       1999         2000            2000
                                                              -------   --------   -------------   -------------
                                                                                                    (UNAUDITED)
<S>                                                           <C>       <C>        <C>             <C>
ASSETS
Current Assets:
  Cash and cash equivalents.................................  $16,454   $  8,358     $ 31,235
  Short-term investments....................................       --         --       39,134
  Interest receivable.......................................       --         --        1,074
  Prepaid expenses and other current assets.................      412        428          353
                                                              -------   --------     --------
    Total current assets....................................   16,866      8,786       71,796
Long-term investments.......................................       --         --       23,320
Property and equipment, net.................................    3,280      2,442        2,277
Other assets................................................       69         69           69
                                                              -------   --------     --------
    Total assets............................................  $20,215   $ 11,297     $ 97,462
                                                              =======   ========     ========
LIABILITIES, MEMBERS' AND STOCKHOLDERS' EQUITY
Current Liabilities:
  Accounts payable..........................................  $   239   $     42     $    341
  Accrued liabilities.......................................      636        459          628
  Convertible notes payable to related parties..............       --      5,000           --
  Due to related parties....................................    2,690        456          748
                                                              -------   --------     --------
    Total current liabilities...............................    3,565      5,957        1,717
Deferred rent...............................................      116         87           57
                                                              -------   --------     --------
    Total liabilities.......................................    3,681      6,044        1,774
                                                              -------   --------     --------
Commitments and contingencies (Notes 4 and 7)
Members' and Stockholders' Equity
  Series A preferred capital; 4,400,000 units authorized,
    issued and outstanding at December 31, 1998 and 1999....   10,762      5,119           --        $     --
  Series B preferred capital; 4,400,000 units authorized,
    issued and outstanding at December 31, 1998 and 1999....    5,762        119           --              --
  Common capital; 2,200,000 units authorized, no units
    issued and outstanding..................................       --         --           --              --
  Series A preferred stock, $0.01 par value; 4,400,000
    shares authorized, issued and outstanding at September
    30, 2000, none pro forma (liquidation value: $15,000 at
    September 30, 2000).....................................       --         --           44              --
  Series B preferred stock, $0.01 par value; 4,400,000
    shares authorized, issued and outstanding at September
    30, 2000, none pro forma (liquidation value: $10,000 at
    September 30, 2000).....................................       --         --           44              --
  Series C preferred stock, $0.01 par value; 13,500,000
    shares authorized at September 30, 2000, 13,225,807
    shares issued and outstanding at September 30, 2000,
    none pro forma (liquidation value: $102,500 at September
    30, 2000)...............................................       --         --          132              --
  Common stock, $0.01 par value; 50,000,000 shares
    authorized at September 30, 2000, 207,242 shares issued
    and outstanding at September 30, 2000, 22,233,049 pro
    forma...................................................       --         --            2             222
  Additional paid-in capital................................       10         15      105,896         105,896
  Deferred stock compensation...............................       --         --       (5,193)         (5,193)
  Accumulated other comprehensive income (loss).............       --         --           (6)             (6)
  Deficit accumulated during the development stage..........       --         --       (5,231)         (5,231)
                                                              -------   --------     --------        --------
    Total members' and stockholders' equity.................   16,534      5,253       95,688        $ 95,688
                                                              -------   --------     --------        ========
    Total liabilities, members' and stockholders' equity....  $20,215   $ 11,297     $ 97,462
                                                              =======   ========     ========
</TABLE>

   The accompanying notes are an integral part of these financial statements.

                                       F-3
<PAGE>   78

                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                            STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                FOR THE                                                            CUMULATIVE
                              PERIOD FROM                                                          PERIOD FROM
                            AUGUST 29, 1997                                                      AUGUST 29, 1997
                              (INCEPTION)                                 NINE MONTHS ENDED        (INCEPTION)
                                THROUGH       YEAR ENDED DECEMBER 31,       SEPTEMBER 30,            THROUGH
                             DECEMBER 31,     -----------------------   ----------------------    SEPTEMBER 30,
                                 1997           1998          1999         1999         2000          2000
                            ---------------   ---------    ----------   -----------   --------   ---------------
                                                                        (UNAUDITED)
<S>                         <C>               <C>          <C>          <C>           <C>        <C>
License revenue...........       $  --         $    --      $    100     $    100     $     --      $    100
                                 -----         -------      --------     --------     --------      --------
Operating expenses:
  Research and development
     (including stock
     compensation expense
     of $794 for the nine
     months ended
     September 30, 2000
     and for the
     cumulative period
     from inception
     through September 30,
     2000)................         401           6,761         9,461        7,654        7,182        23,805
  General and
     administrative
     (including stock
     compensation expense
     of $2,183 for the
     nine months ended
     September 30, 2000
     and for the
     cumulative period
     from inception
     through September 30,
     2000)................         279           1,882         2,345        1,877        3,903         8,409
                                 -----         -------      --------     --------     --------      --------
Loss from operations......        (680)         (8,643)      (11,706)      (9,431)     (11,085)      (32,114)
Interest and other
  income..................         132             715           540          564        3,359         4,746
Interest expense..........          --              --          (120)         (49)         (73)         (193)
                                 -----         -------      --------     --------     --------      --------
Net loss..................       $(548)        $(7,928)     $(11,286)    $ (8,916)    $ (7,799)     $(27,561)
                                 =====         =======      ========     ========     ========      ========
Net loss per share, basic
  and diluted.............       $  --         $    --      $     --     $     --     $(117.96)
                                 =====         =======      ========     ========     ========
Shares used to compute net
  loss per share, basic
  and diluted.............          --              --            --           --           66
Pro forma net loss per
  share, basic and
  diluted.................                                  $  (1.28)                 $  (0.45)
                                                            ========                  ========
Shares used to compute pro
  forma net loss per
  share, basic and
  diluted.................                                     8,800                    17,441
</TABLE>

   The accompanying notes are an integral part of these financial statements.
                                       F-4
<PAGE>   79

                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                STATEMENTS OF MEMBERS' AND STOCKHOLDERS' EQUITY
                       (IN THOUSANDS, EXCEPT SHARE DATA)
<TABLE>
<CAPTION>

                                   SERIES A               SERIES B
                              PREFERRED CAPITAL      PREFERRED CAPITAL        MEMBER
                             --------------------   --------------------   CONTRIBUTIONS
                               UNITS      DOLLARS     UNITS      DOLLARS    RECEIVABLE
                             ----------   -------   ----------   -------   -------------
<S>                          <C>          <C>       <C>          <C>       <C>
Issuance, at inception, of
 Series A units at $3.41
 per unit..................   4,400,000   $15,000           --   $    --     $(11,000)
Issuance, at inception, of
 Series A units at $2.27
 per unit..................          --        --    4,400,000    10,000       (6,000)
Net loss...................          --      (274)          --      (274)          --
                             ----------   -------   ----------   -------     --------
Balance at December 31,
 1997......................   4,400,000    14,726    4,400,000     9,726      (17,000)
Proceeds received from
 Members...................          --        --           --        --       17,000
Stock-based compensation...          --        --           --        --           --
Net loss...................          --    (3,964)          --    (3,964)          --
                             ----------   -------   ----------   -------     --------
Balance at December 31,
 1998......................   4,400,000    10,762    4,400,000     5,762           --
Stock-based compensation...          --        --           --        --           --
Net loss...................          --    (5,643)          --    (5,643)          --
                             ----------   -------   ----------   -------     --------
Balance at December 31,
 1999......................   4,400,000     5,119    4,400,000       119           --
Net loss to April 4........          --    (1,284)          --    (1,284)          --
Conversion to C
 corporation...............  (4,400,000)   (3,835)  (4,400,000)    1,165           --
Issuance of Series C
 preferred stock upon
 conversion of note payable
 to related party..........          --        --           --        --           --
Issuance of Series C
 preferred stock, net of
 issuance costs of
 $7,322....................          --        --           --        --           --
Issuance of common stock...          --        --           --        --           --
Deferred stock
 compensation..............          --        --           --        --           --
Amortization of deferred
 stock compensation........          --        --           --        --           --
Comprehensive loss:
 Net loss from April 5.....          --        --           --        --           --
 Unrealized loss on
   available-for-sale
   securities..............          --        --           --        --           --
 Comprehensive loss........
                             ----------   -------   ----------   -------     --------
Balance at September 30,
 2000......................          --   $    --           --   $    --     $     --
                             ==========   =======   ==========   =======     ========

<CAPTION>

                                  SERIES A              SERIES B               SERIES C
                               PREFERRED STOCK       PREFERRED STOCK       PREFERRED STOCK        COMMON STOCK
                             -------------------   -------------------   --------------------   -----------------
                              SHARES     DOLLARS    SHARES     DOLLARS     SHARES     DOLLARS   SHARES    DOLLARS
                             ---------   -------   ---------   -------   ----------   -------   -------   -------
<S>                          <C>         <C>       <C>         <C>       <C>          <C>       <C>       <C>
Issuance, at inception, of
 Series A units at $3.41
 per unit..................         --     $--            --     $--             --   $    --        --     $--
Issuance, at inception, of
 Series A units at $2.27
 per unit..................         --      --            --      --             --        --        --      --
Net loss...................         --      --            --      --             --        --        --      --
                             ---------     ---     ---------     ---     ----------   -------   -------     ---
Balance at December 31,
 1997......................         --      --            --      --             --        --        --      --
Proceeds received from
 Members...................         --      --            --      --             --        --        --      --
Stock-based compensation...         --      --            --      --             --        --        --      --
Net loss...................         --      --            --      --             --        --        --      --
                             ---------     ---     ---------     ---     ----------   -------   -------     ---
Balance at December 31,
 1998......................         --      --            --      --             --        --        --      --
Stock-based compensation...         --      --            --      --             --        --        --      --
Net loss...................         --      --            --      --             --        --        --      --
                             ---------     ---     ---------     ---     ----------   -------   -------     ---
Balance at December 31,
 1999......................         --      --            --      --             --        --        --      --
Net loss to April 4........         --      --            --      --             --        --        --      --
Conversion to C
 corporation...............  4,400,000      44     4,400,000      44             --        --        --      --
Issuance of Series C
 preferred stock upon
 conversion of note payable
 to related party..........         --      --            --      --        322,580         3        --      --
Issuance of Series C
 preferred stock, net of
 issuance costs of
 $7,322....................         --      --            --      --     12,903,227       129        --      --
Issuance of common stock...         --      --            --      --             --        --   207,242       2
Deferred stock
 compensation..............         --      --            --      --             --        --        --      --
Amortization of deferred
 stock compensation........         --      --            --      --             --        --        --      --
Comprehensive loss:
 Net loss from April 5.....         --      --            --      --             --        --        --      --
 Unrealized loss on
   available-for-sale
   securities..............         --      --            --      --             --        --        --      --
 Comprehensive loss........
                             ---------     ---     ---------     ---     ----------   -------   -------     ---
Balance at September 30,
 2000......................  4,400,000     $44     4,400,000     $44     13,225,807   $   132   207,242     $ 2
                             =========     ===     =========     ===     ==========   =======   =======     ===

<CAPTION>
                                                          ACCUMULATED      DEFICIT
                                                             OTHER       ACCUMULATED
                             ADDITIONAL     DEFERRED     COMPREHENSIVE   DURING THE
                              PAID-IN        STOCK          INCOME       DEVELOPMENT
                              CAPITAL     COMPENSATION      (LOSS)          STAGE       TOTAL
                             ----------   ------------   -------------   -----------   --------
<S>                          <C>          <C>            <C>             <C>           <C>
Issuance, at inception, of
 Series A units at $3.41
 per unit..................  $       --     $    --           $--          $    --     $  4,000
Issuance, at inception, of
 Series A units at $2.27
 per unit..................          --          --            --               --        4,000
Net loss...................          --          --            --               --         (548)
                             ----------     -------           ---          -------     --------
Balance at December 31,
 1997......................          --          --            --               --        7,452
Proceeds received from
 Members...................          --          --            --               --       17,000
Stock-based compensation...          10          --            --               --           10
Net loss...................          --          --            --               --       (7,928)
                             ----------     -------           ---          -------     --------
Balance at December 31,
 1998......................          10          --            --               --       16,534
Stock-based compensation...           5          --            --               --            5
Net loss...................          --          --            --               --      (11,286)
                             ----------     -------           ---          -------     --------
Balance at December 31,
 1999......................          15          --            --               --        5,253
Net loss to April 4........          --          --            --               --       (2,568)
Conversion to C
 corporation...............       2,582          --            --               --           --
Issuance of Series C
 preferred stock upon
 conversion of note payable
 to related party..........       2,497          --            --               --        2,500
Issuance of Series C
 preferred stock, net of
 issuance costs of
 $7,322....................      92,549          --            --               --       92,678
Issuance of common stock...          83          --            --               --           85
Deferred stock
 compensation..............       8,170      (8,170)           --               --           --
Amortization of deferred
 stock compensation........          --       2,977            --               --        2,977
Comprehensive loss:
 Net loss from April 5.....          --          --            --           (5,231)      (5,231)
 Unrealized loss on
   available-for-sale
   securities..............          --          --            (6)              --           (6)
                                                                                       --------
 Comprehensive loss........                                                              (5,237)
                             ----------     -------           ---          -------     --------
Balance at September 30,
 2000......................  $  105,896     $(5,193)          $(6)         $(5,231)    $ 95,688
                             ==========     =======           ===          =======     ========
</TABLE>

   The accompanying notes are an integral part of these financial statements.

                                       F-5
<PAGE>   80

                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                            STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                                               CUMULATIVE
                                                AUGUST 29,                                                    PERIOD FROM
                                                   1997                                                     AUGUST 29, 1997
                                               (INCEPTION)                                                    (INCEPTION)
                                                 THROUGH          YEAR ENDED         NINE MONTHS ENDED          THROUGH
                                               DECEMBER 31,      DECEMBER 31,          SEPTEMBER 30,         SEPTEMBER 30,
                                               ------------   ------------------   ----------------------   ----------------
                                                   1997        1998       1999        1999         2000           2000
                                               ------------   -------   --------   -----------   --------   ----------------
                                                                                   (UNAUDITED)
<S>                                            <C>            <C>       <C>        <C>           <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss...................................     $ (548)     $(7,928)  $(11,286)    $(8,916)    $ (7,799)      $(27,561)
  Adjustments to reconcile net loss to net
    cash used in operating activities:
    Depreciation and amortization............          2        1,657      1,072         798          819          3,550
    Stock compensation expense...............         --           10          5           3        2,977          2,992
    Loss on disposal of property and
      equipment..............................         --           23          3           2           --             26
    Changes in operating assets and
      liabilities:
      Interest receivable....................         --           --         --          --       (1,074)        (1,074)
      Prepaid expenses and other current
        assets...............................        (89)        (317)       (24)         63           75           (355)
      Accounts payable.......................         --          239       (197)      1,038          299            341
      Accrued liabilities....................        207          244       (177)        278          169            443
      Due to related parties.................        185          132     (2,234)     (2,570)         414         (1,503)
      Deferred rent..........................        102           14        (29)         (1)         (30)            57
                                                  ------      -------   --------     -------     --------       --------
        Net cash used in operating
          activities.........................       (141)      (5,926)   (12,867)     (9,305)      (4,150)       (23,084)
                                                  ------      -------   --------     -------     --------       --------
CASH USED IN INVESTING ACTIVITIES:
  Purchases of property and equipment........       (272)      (1,160)      (238)       (194)        (653)        (2,323)
  Proceeds from sale of equipment............         --           --          9          --           --              9
  Purchases of short-term investments........         --           --         --          --      (39,240)       (39,240)
  Purchases of long-term investments.........         --           --         --          --      (23,221)       (23,221)
                                                  ------      -------   --------     -------     --------       --------
        Net cash used in investing
          activities.........................       (272)      (1,160)      (229)       (194)     (63,114)       (64,775)
                                                  ------      -------   --------     -------     --------       --------
CASH PROVIDED BY FINANCING ACTIVITIES:
  Proceeds from issuance of convertible notes
    payable to related parties...............         --           --      5,000       5,000           --          5,000
  Repayment of convertible notes payable to
    related parties..........................         --           --         --          --       (2,621)        (2,621)
  Proceeds from related party contributions
    receivable...............................         --       17,000         --          --           --         17,000
  Proceeds from issuance of Series A
    preferred stock..........................      2,953           --         --          --           --          2,953
  Proceeds from issuance of Series B
    preferred stock..........................      4,000           --         --          --           --          4,000
  Proceeds from issuance of Series C
    preferred stock, net of issuance costs...         --           --         --          --       92,678         92,678
  Proceeds from issuance of common stock.....         --           --         --          --           84             84
                                                  ------      -------   --------     -------     --------       --------
        Net cash provided by financing
          activities.........................      6,953       17,000      5,000       5,000       90,141        119,094
                                                  ------      -------   --------     -------     --------       --------
Net increase (decrease) in cash and cash
  equivalents................................      6,540        9,914     (8,096)     (4,499)      22,877         31,235
Cash and cash equivalents at beginning of
  period.....................................         --        6,540     16,454      16,454        8,358             --
                                                  ------      -------   --------     -------     --------       --------
Cash and cash equivalents at end of period...     $6,540      $16,454   $  8,358     $11,955     $ 31,235       $ 31,235
                                                  ======      =======   ========     =======     ========       ========
SUPPLEMENTAL DISCLOSURES OF CASH FLOW
  INFORMATION:
  Interest paid..............................     $   --      $    --   $     --     $    --     $    194       $    194
NONCASH INVESTING AND FINANCING ACTIVITIES:
  Conversion of notes payable into Series C
    preferred stock..........................         --           --         --          --        2,500          2,500
  Construction in-progress funded by related
    party....................................      2,199          106         --          --           --          2,305
  Capital contribution of property and
    equipment................................      1,047           --         --          --           --          1,047
</TABLE>

   The accompanying notes are an integral part of these financial statements.
                                       F-6
<PAGE>   81

                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                         NOTES TO FINANCIAL STATEMENTS

NOTE 1 -- THE COMPANY:

     diaDexus, Inc., (the "Company"), was founded as a Delaware limited
liability company in August 1997 by SmithKline Beecham Corporation ("SmithKline
Beecham") and Incyte Genomics, Inc.("Incyte") (together, the "Members"). On
April 4, 2000, the Company was converted to a Delaware corporation (see Note 2).

     The Company focuses on translating raw genomics data into novel diagnostic
and therapeutic products. Since its formation in 1997, the initial strategy of
the Company has been to discover molecular targets and develop novel diagnostic
products for the improved detection, classification and prognosis of diseases.
The Company recently expanded its strategy to include therapeutic discovery and
development. Where possible, the Company seeks to develop diagnostic and
therapeutic products that are directed at the same molecular target, enabling a
diagnostic/therapeutic tandem approach to detect and treat disease. The Company
expects to extend its discovery platform beyond the initial focus on cancer into
other diagnostic and therapeutic areas.

NOTE 2 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

UNAUDITED INTERIM RESULTS

     The accompanying statements of operations and cash flows for the nine
months ended September 30, 1999 are unaudited. The unaudited interim financial
statements have been prepared on the same basis as the annual financial
statements and, in the opinion of management, reflect all adjustments, which
include only normal recurring adjustments, necessary to present fairly the
Company's results of operations and cash flows for the nine months ended
September 30, 1999. The financial data and other information disclosed in these
notes to the financial statements related to this period are unaudited. The
results of operations for any interim period are not necessarily indicative of
the results of operations for the full year.

INITIAL PUBLIC OFFERING

     In November 2000, the Board of Directors authorized management of the
Company to file a registration statement with the Securities and Exchange
Commission permitting the Company to sell shares of its common stock to the
public.

UNAUDITED PRO FORMA STOCKHOLDERS' EQUITY

     If the Company's initial public offering is completed under the terms
presently anticipated, all of the convertible preferred stock outstanding will
automatically convert into common stock. Unaudited pro forma stockholders'
equity at September 30, 2000, as adjusted for the assumed conversion of
preferred stock, is set forth on the accompanying balance sheets.

USE OF ESTIMATES

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and the
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amount of income and expenses during the reporting
period. Actual results could differ from those estimates.

                                       F-7
<PAGE>   82
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

CONCENTRATION OF CREDIT RISK AND OTHER RISKS AND UNCERTAINTIES

     The Company's financial instruments that are subject to concentration of
credit risk consist primarily of cash and cash equivalents and marketable
securities. The Company's policy is to place its cash and cash equivalents and
marketable securities with high credit quality financial institutions in order
to limit the amount of credit exposure. The Company has not experienced any
losses to date.

     The Company's future products may require approval from the U.S. Food and
Drug Administration ("FDA") and may require approval from certain international
regulatory agencies prior to commencing commercial sales. There can be no
assurance that the Company's products will receive any of these required
approvals. If the Company was denied such approvals or such approvals were
delayed, it would have a material adverse impact on the Company's results of
operations.

     The Company is subject to risks common to companies in the biotechnology
industry including, but not limited to, new technological innovations,
dependence on key personnel, protection of proprietary technology, compliance
with government regulations, uncertainty of market acceptance of products,
product liability and the need to obtain additional financing.

     SmithKline Beecham accounted for 100% of revenues during the year ended
December 31, 1999.

CASH AND CASH EQUIVALENTS

     The Company considers all highly liquid investments with original
maturities of less than 90 days to be cash equivalents. Investments with
maturities of less than one year from the balance sheet date and with original
maturities greater than 90 days are considered short-term investments.
Investments consist primarily of money market accounts, commercial paper,
certificates of deposit and other short-term instruments. These investments
typically bear minimal risk. This minimization of risk is consistent with the
Company's policy to maintain high liquidity and ensure safety of principal.

INVESTMENTS

     The Company's short-term and long-term investments are classified as
available-for-sale. Available-for-sale securities are carried at fair value
based on quoted market prices, with the unrealized gains and losses included in
accumulated other comprehensive income within stockholders' equity. The
amortized cost of debt securities in this category is adjusted for amortization
of premiums and accretion of discounts to maturity. Such amortization is
included in interest and other income. Realized gains and losses and declines in
value judged to be other-than-temporary on available-for-sale securities are
also included in interest and other income. Interest and dividends on securities
classified as available-for-sale are included in interest and other income. The
cost of securities sold is based on the specific identification method.

     The amortized cost and fair value of securities, with gross unrealized
gains and losses, were as follows (in thousands):

<TABLE>
<CAPTION>
                                                          SEPTEMBER 30, 2000
                                          ---------------------------------------------------
                                                         GROSS         GROSS
                                          AMORTIZED    UNREALIZED    UNREALIZED
                                            COST         GAINS         LOSSES      FAIR VALUE
                                          ---------    ----------    ----------    ----------
<S>                                       <C>          <C>           <C>           <C>
Debt securities:
  Corporate bonds.......................   $62,460        $100         $(106)       $62,454
                                           =======        ====         =====        =======
</TABLE>

                                       F-8
<PAGE>   83
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

     The fair value of available-for-sale debt securities by contractual
maturity at September 30, 2000 was as follows (in thousands):

<TABLE>
<S>                                                           <C>
Within 1 year...............................................  $39,134
Greater than 1 year less than 5 years.......................   23,320
                                                              -------
                                                              $62,454
                                                              =======
</TABLE>

PROPERTY AND EQUIPMENT

     Property and equipment are recorded at cost and depreciated over their
estimated useful lives using the straight-line method. Assets contributed by the
Members during 1997 were recorded at amounts equal to the Members' net carrying
value. Laboratory equipment, computers, software, and office furniture are
depreciated over three years. Leasehold improvements are recorded at cost and
amortized over the term of the non-cancelable lease or their useful life,
whichever is shorter. Maintenance and repairs are expensed as incurred.

IMPAIRMENT OF LONG-LIVED ASSETS

     The Company reviews long-lived assets for impairment whenever events or
circumstances suggest that the carrying amount of those assets may not be fully
recoverable or that the estimated useful life of those assets has changed
significantly. When expected future undiscounted cash flows that are expected to
be generated by an asset are less than its carrying amount, then an impairment
loss is recognized, and the asset is written down to its estimated fair value.

REVENUE RECOGNITION

     The amount received during 1999 from SmithKline Beecham under a
non-refundable license arrangement was recognized when earned and no remaining
performance obligation existed. Any amounts received in advance of completing
the earnings process are recorded as deferred revenue.

RESEARCH AND DEVELOPMENT

     The Company recognizes research and development expense as incurred.

INCOME TAXES

     From the Company's inception through April 4, 2000, no provision or benefit
for federal or state income taxes was recorded in the financial statements as
the Company was a limited liability company and, therefore, was taxed as a
partnership. Rather, the federal and state income tax effects of the Company's
results of operations were recorded by the Members in their respective income
tax returns. On April 4, 2000, in connection with completing the Series C
preferred stock financing, the Company became subject to the C corporation
provisions of the Internal Revenue Code. Accordingly, any earnings after this
date will be taxed at federal and state corporate income tax rates.

     Current income tax expense (benefit) is the amount of income taxes expected
to be payable (refundable) for the current year. A deferred income tax asset or
liability is computed for the expected future impact of the differences between
the financial reporting and tax bases of assets and liabilities as well as the
expected future tax benefit to be derived from tax loss and tax credit
carryforwards. Deferred income tax expense (benefit) is generally the net change
during the year in the deferred income tax assets or liability. A valuation
allowance is established when necessary to reduce deferred tax assets to the
amount more likely than not to be realized in future tax returns.

                                       F-9
<PAGE>   84
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

STOCK-BASED COMPENSATION

     The Company accounts for stock-based employee compensation arrangements in
accordance with the provisions of Accounting Principles Board Opinion No. 25,
"Accounting for Stock Issued to Employees" ("APB No. 25") and Financial
Accounting Standards Board Interpretation No. 28, "Accounting for Stock
Appreciation Rights and Other Variable Stock Option or Award Plans" ("FIN No.
28") and complies with the pro forma disclosure provisions of Statement of
Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation" ("SFAS No. 123").

     Under APB No. 25, compensation expense is based on the difference, if any,
on the date of the grant, between the estimated fair value of the Company's
common stock and the exercise price. SFAS No. 123 defines a "fair value" based
method of accounting for employee stock options. Pro forma disclosures of the
difference between compensation expense included in net loss and the related
cost measured by the fair value method are presented (see Note 5).

     The Company accounts for stock issued to non-employees in accordance with
the provisions of SFAS No. 123 and Emerging Issue Task Force No. 96-18,
"Accounting for Equity Instruments that are issued Other Than Employees for
Acquiring or in Conjunction with Selling, Goods and Services" ("EITF No.
96-18").

COMPREHENSIVE INCOME (LOSS)

     The Company accounts for comprehensive income in accordance with Statement
of Financial Accounting Standards No. 130, "Reporting Comprehensive Income"
("SFAS No. 130"). SFAS No. 130 establishes standards for reporting and
displaying comprehensive income (loss) and its components. Comprehensive income
(loss) refers to revenues, expenses, gains and losses that under generally
accepted accounting principles are included in comprehensive income (loss) but
excluded from net income (loss).

NET LOSS PER SHARE

     The Company computes basic net loss per share by dividing net loss by the
weighted average number of common shares outstanding for the period. Diluted net
loss per share is computed using the weighted-average number of shares of common
stock outstanding and, when dilutive, potential common shares from options and
warrants to purchase common stock using the treasury stock method and from
convertible securities using the if-converted method. These potential common
shares are antidilutive for all periods presented and, therefore, have been
excluded from the calculation of diluted net loss per share.

     The following potentially dilutive common shares were excluded from the
calculation of diluted net loss per share because their effect was antidilutive
(in thousands):

<TABLE>
<CAPTION>
                                                                             NINE MONTHS ENDED
                                               YEAR ENDED DECEMBER 31,         SEPTEMBER 30,
                                               ------------------------    ---------------------
                                               1997     1998      1999        1999         2000
                                               -----    -----    ------    -----------    ------
                                                                           (UNAUDITED)
<S>                                            <C>      <C>      <C>       <C>            <C>
Convertible preferred stock..................  8,800    8,800     8,800       8,800       22,026
Common stock options.........................     --      716     1,338         665        2,287
Preferred stock warrant......................     --       --        --          --          129
                                               -----    -----    ------       -----       ------
                                               8,800    9,516    10,138       9,465       24,442
                                               =====    =====    ======       =====       ======
</TABLE>

                                      F-10
<PAGE>   85
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

PRO FORMA NET LOSS PER SHARE (UNAUDITED)

     Pro forma basic and diluted net loss per share is calculated using the
weighted average number of shares of common stock outstanding, including
convertible preferred shares (using the if-converted method) that will
automatically convert to shares of Common Stock immediately prior to completion
of the initial public offering, as if they had been converted on January 1, 1999
or the original date of issuance if later. Potentially dilutive common shares
derived from stock options and warrants were excluded from this calculation
because their effect was antidilutive. The following table sets forth the
calculation of basic and diluted pro forma net loss per share (in thousands,
except per share data):

<TABLE>
<CAPTION>
                                                                      NINE MONTHS
                                                      YEAR ENDED         ENDED
                                                     DECEMBER 31,    SEPTEMBER 30,
                                                         1999            2000
                                                     ------------    -------------
<S>                                                  <C>             <C>
Net loss...........................................    $(11,286)        $(7,799)
Weighted average shares used to compute pro forma
  basic and diluted net loss per share.............       8,800          17,441
Pro forma basic and diluted net loss per share.....    $  (1.28)        $ (0.45)
</TABLE>

RECENT ACCOUNTING PRONOUNCEMENT

     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 133, "Accounting for Derivative Instruments
and Hedging Activities" ("SFAS No. 133"). SFAS No. 133 establishes new standards
of accounting and reporting for derivative instruments and hedging activities.
SFAS No. 133 requires that all derivatives be recognized at fair value in the
statement of financial position, and that the corresponding gains or losses be
reported either in the statement of operations or as a component of
comprehensive income (loss), depending on the type of hedge transaction. The
Company, to date, has not engaged in derivative or hedging activities. The
Company will adopt SFAS No. 133, as required, in fiscal year 2001.

NOTE 3 -- BALANCE SHEET COMPONENTS

     Property and equipment consist of the following (in thousands):

<TABLE>
<CAPTION>
                                                        DECEMBER 31,
                                                     ------------------    SEPTEMBER 30,
                                                      1998       1999          2000
                                                     -------    -------    -------------
<S>                                                  <C>        <C>        <C>
Laboratory, computer and office equipment..........  $ 2,339    $ 2,523       $ 3,159
Leasehold improvements.............................    2,111      2,631         2,649
Construction in-progress...........................      477         --            --
                                                     -------    -------       -------
Total..............................................    4,927      5,154         5,808
Less: Accumulated depreciation and amortization....   (1,647)    (2,712)       (3,531)
                                                     -------    -------       -------
                                                     $ 3,280    $ 2,442       $ 2,277
                                                     =======    =======       =======
</TABLE>

                                      F-11
<PAGE>   86
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

     Accrued liabilities consist of the following (in thousands):

<TABLE>
<CAPTION>
                                                  DECEMBER 31,
                                                  ------------    SEPTEMBER 30,
                                                  1998    1999        2000
                                                  ----    ----    -------------
<S>                                               <C>     <C>     <C>
Payroll and related.............................  $197    $230        $354
Deposits........................................    45      45          62
Other...........................................   394     184         212
                                                  ----    ----        ----
                                                  $636    $459        $628
                                                  ====    ====        ====
</TABLE>

NOTE 4 -- COMMITMENTS AND CONTINGENCIES

     The Company has an operating lease for laboratory and office facilities in
Santa Clara, California through September 30, 2002. The lease has a renewal
option. Minimum future lease payments under the non-cancelable lease as of
September 30, 2000 are as follows (in thousands):

<TABLE>
<CAPTION>
                        YEAR ENDING
                        DECEMBER 31,
                        ------------
<S>                                                            <C>
2000........................................................   $  203
2001........................................................      818
2002........................................................      624
                                                               ------
                                                               $1,645
                                                               ======
</TABLE>

     Rent expense was $310,000, $825,000 and $838,000, and $606,000 for the
period from August 29, 1997 (inception) through December 1997, the years ended
December 31, 1998 and 1999, and for the nine months ended September 30, 2000,
respectively. A security deposit of $67,000 relating to our facility lease was
paid by SmithKline Beecham and is included in due to related parties in the
accompanying balance sheets.

     The Company has subleased a portion of its leased office facilities under a
non-cancelable lease agreement since 1998. Rental income for the years ended
December 31, 1998 and 1999 and for the nine months ended September 30, 2000 was
$117,000, $202,000 and $242,000, respectively.

     In September 1997, the Company entered into a $5,000,000 agreement with
Incyte for microarray services and products and future sequencing services. At
September 30, 2000, the Company is committed under the agreement to pay Incyte
approximately $402,000 through February 2001.

     The Company entered into a collaboration agreement with the University of
Pittsburgh Medical Center effective October 1, 2000 to analyze RNA expression in
human cancer tissues. Under this agreement, the University of Pittsburgh Medical
Center will perform RNA expression analysis on human cancer and corresponding
non-malignant tissues to establish genotypic classifications. The Company will
pay the University of Pittsburgh Medical Center approximately $1,200,000 over
the three year term of this agreement.

     The Company entered into a one-year agreement with Agilent Technologies,
Inc. in August 2000 for early access to Agilent's DNA microarray technology.
Under the terms of the agreement, diaDexus will purchase a number of custom
in-situ microarrays at a cost of approximately $405,000.

     The Company has entered into employment agreements with certain key
executive officers. Such agreements provide for severance payments and, in one
case, provide for accelerated vesting following a change in control of the
Company.

                                      F-12
<PAGE>   87
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

NOTE 5 -- MEMBERS' AND STOCKHOLDERS' EQUITY:

PREFERRED UNITS AND STOCK

     In September 1997, the Company issued 4,400,000 Series A Preferred units,
no par value, to SmithKline Beecham, at $3.41 per unit. At the time these units
were issued, the Company received an initial capital contribution of $4,000,000
in cash and assets and a contractual commitment for additional cash
contributions of $7,000,000 and $4,000,000 which were received on April 15, 1998
and July 15, 1998, respectively. Upon conversion of the Company from a limited
liability company into a C corporation, the Series A Preferred units were
converted into Series A Preferred Stock on a one-to-one basis. The Series A
Preferred Stock converts automatically to Common Stock upon completion of an
initial public offering by the Company that results in net proceeds of at least
$20,000,000 and an offering price of at least $10.00 per share.

     In September 1997, the Company also issued 4,400,000 Series B Preferred
units, no par value, to Incyte at $2.27 per share. At the time these units were
issued, the Company received an initial capital contribution of $4,000,000 in
cash and a contractual commitment for additional cash contributions of
$2,000,000 and $4,000,000 which were received on April 15, 1998 and July 15,
1998, respectively. Upon conversion of the Company from a limited liability
company into a C corporation, the Series B Preferred units were converted into
Series B Preferred Stock on a one-to-one basis. The Series B Preferred Stock
converts automatically to Common Stock upon completion of an initial public
offering by the Company that results in net proceeds of at least $20,000,000 and
an offering price of at least $10.00 per share.

     In April 2000, the Company issued 13,225,807 shares of Series C Preferred
Stock, $0.01 par value, at $7.75 per share. Net proceeds were approximately
$92,678,000 after cash offering expenses of $7,322,000. The Series C Preferred
Stock converts automatically to Common Stock upon completion of an initial
public offering by the Company that results in net proceeds of at least
$20,000,000 and an offering price of at least $10.00 per share.

     In connection with the sale of Series C Preferred Stock, the Company issued
a warrant in June 2000 to purchase 129,032 shares of Series C Preferred Stock at
$7.75 per share to the placement agent. The Series C Preferred Stock warrant
converts automatically to a Common Stock warrant upon completion of an initial
public offering by the Company that results in net proceeds of at least $20
million and an offering price of at least $10.00 per share. The warrant becomes
exercisable in 2005. The Company valued this warrant using the Black-Scholes
option pricing model with the following assumptions: expected life of five
years; risk free interest rate of 6.23%; expected dividend yield of zero, and
volatility of 85%. The fair value of the warrant of $846,367 is included in the
carrying value of the Series C Preferred Stock.

     At September 30, 2000, the Company has reserved 22,154,839 shares of Common
Stock for future issuance upon the conversion of the Preferred Stock.

DIVIDENDS

     In the event dividends are paid on any share of Common Stock, an additional
dividend must be paid with respect to all outstanding shares of Preferred Stock
in an amount per share (on an as-if-converted basis) equal to the amount paid or
set aside for each share of Common Stock whenever funds are legally available.
Such dividends are payable when, as and if declared by the Board of Directors.
No dividends accrue unless declared by the Board of Directors. As of September
30, 2000, no dividends had been declared.

                                      F-13
<PAGE>   88
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

LIQUIDATION PREFERENCE

     In the event of any liquidation, dissolution or winding up of the Company,
either voluntary or involuntary, holders of the Series A, Series B and Series C
Preferred Stock shall be entitled to receive, prior and in preference to any
distribution of any of the assets to the holders of the Common Stock, an amount
per share equal to $3.41 for each outstanding share of Series A Preferred Stock,
$2.27 for each outstanding share of Series B Preferred Stock and $7.75 for each
outstanding share of Series C Preferred Stock plus any declared but unpaid
dividends on such share of Series A, Series B or Series C Preferred Stock. If
upon the occurrence of such an event, the assets and funds thus distributed
among the holders of the Preferred Stock shall be insufficient to permit the
payment to such holders of the full aforesaid preferential amounts, then, the
entire assets and funds of the Company legally available for distribution shall
be distributed ratably among the holders of the Series A, Series B and Series C
Preferred Stock in proportion to the aggregate liquidation preference of such
stock owned by each such holder.

     Upon completion of the distributions described above, all of the remaining
assets of the Company available for distribution to stockholders shall be
distributed among the holders of Common Stock pro rata based on the number of
shares of Common Stock held by each.

VOTING RIGHTS

     Holders of Series A, Series B and Series C Preferred Stock are entitled to
one vote for each share of Common Stock into which such shares can be converted.
The holders of the outstanding shares of Series A and Series B Preferred Stock,
voting as separate classes, are each entitled to elect one member to the
Company's Board of Directors and the holders of the outstanding shares of Series
C Preferred Stock, voting as a separate class, are entitled to elect two members
to the Company's Board of Directors. Any remaining board members will be elected
by the holders of Common Stock and the holders of Preferred Stock voting
together as a single class.

REGISTRATION RIGHTS

     The holders of the Company's Preferred Stock have the right to require the
Company to register their shares with the Securities and Exchange Commission so
that those shares may be publicly resold or to include their shares in any
registration statement we file.

CONVERSION RIGHTS

     Shares of Series A, Series B and Series C Preferred Stock are convertible
into shares of Common Stock at the option of the holder, or automatically upon
completing a public offering of at least $20,000,000 of Common Stock at an
offering price of at least $10.00 per share, upon the written consent of the
holders of at least 80% of the then outstanding shares of Series A, Series B and
Series C Preferred Stock voting together as a single class on an as-if-converted
basis. The conversion rate is one share of Common Stock for one share of
Preferred Stock (subject to certain adjustments).

STOCK OPTION PLANS

     In January 1998, the Company's Board of Directors adopted the 1997
Incentive Plan ("1997 Plan") under which 1,200,000 shares of the Company's
Common Units ("Units") were reserved for issuance to employees and consultants
of the Company. During 1999, the Company increased the number of Units reserved
for future issuance by 1,000,000. Options granted under the 1997 Plan are for
terms not to exceed ten years. If the option is granted to an individual who, at
the time of grant, owns a membership interest in the Company representing more
than 10% of the voting power of all classes of membership interest of

                                      F-14
<PAGE>   89
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

the Company or any parent or subsidiary, the exercise price of the option must
be at least 110% of the estimated fair value of the Units at the date of grant.
Exercise prices of options granted to all other persons must be at least 85% of
the estimated fair value of the Units at the date of grant. Options under the
1997 Plan generally vest over four years. The 1997 Plan expires in 2008.

     In April 2000, all of the Units granted under the 1997 Plan were converted
into options to acquire shares of Common Stock under the 2000 Equity Incentive
Plan ("2000 Plan"). The 2000 Plan provides for the issuance of options to
purchase up to 2,200,000 shares of the Company's Common Stock. The Board of
Directors has the authority to determine to whom options will be granted, the
number of shares, the term and exercise price (which cannot be less than the
estimated fair value at date of grant for incentive stock options or 85% of fair
market value for nonstatutory stock options). Historically, estimated fair value
has been determined by the Board of Directors. If an employee owns stock
representing more than 10% of the outstanding shares, the price of each share
shall be at least 110% of estimated fair value. Options generally vest ratably
over four years and expire within ten years of the date of the grant. In June
2000, the Company reserved an additional 2,500,000 shares of Common Stock under
the 2000 Plan.

     Stock option activity under the Company's plans is as follows:

<TABLE>
<CAPTION>
                                                                           OUTSTANDING OPTIONS
                                                                          ---------------------
                                                                                       WEIGHTED
                                                             OPTIONS                   AVERAGE
                                                            AVAILABLE     NUMBER OF    EXERCISE
                                                            FOR GRANT      OPTIONS      PRICE
                                                            ----------    ---------    --------
<S>                                                         <C>           <C>          <C>
Options reserved at the plan inception....................   1,200,000           --     $  --
Options granted...........................................    (760,500)     760,500      0.36
Options canceled..........................................      44,250      (44,250)     0.35
                                                            ----------    ---------
Balances, December 31, 1998...............................     483,750      716,250      0.36
Additional shares reserved................................   1,000,000           --        --
Options granted...........................................  (1,055,083)   1,055,083      0.75
Options canceled..........................................     433,738     (433,738)     0.47
                                                            ----------    ---------
Balances, December 31, 1999...............................     862,405    1,337,595      0.63
Additional shares reserved................................   2,500,000           --        --
Options granted...........................................  (1,361,000)   1,361,000      1.30
Options exercised.........................................     207,042     (207,042)     0.41
Options canceled..........................................     204,303     (204,303)     0.68
                                                            ----------    ---------
Balances, September 30, 2000..............................   2,412,750    2,287,250      1.05
                                                            ==========    =========
</TABLE>

                                      F-15
<PAGE>   90
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

     The following summarizes information about stock options outstanding at
September 30, 2000:

<TABLE>
<CAPTION>
                               OPTIONS OUTSTANDING            OPTIONS EXERCISABLE
                       ------------------------------------   -------------------
                                      WEIGHTED
                                      AVERAGE      WEIGHTED              WEIGHTED
                                     REMAINING     AVERAGE               AVERAGE
      EXERCISE                      CONTRACTUAL    EXERCISE              EXERCISE
       PRICES           NUMBER      LIFE (YEARS)    PRICE     NUMBER      PRICE
---------------------  ---------    ------------   --------   -------    --------
<S>                    <C>          <C>            <C>        <C>        <C>
        $0.35            173,000        7.36        $0.35     111,285     $0.35
         0.75            753,250        8.21         0.75     288,882      0.75
         1.20             76,000        9.41         1.20          --        --
         1.30          1,285,000        9.74         1.30          --        --
                       ---------                              -------
                       2,287,250        9.04         1.05     400,167      0.64
                       =========                              =======
</TABLE>

     The weighted average grant date fair value of options granted during the
years ended December 31, 1998 and 1999, and the nine months ended September 30,
2000, was $0.07, $0.14 and $6.06, respectively.

     Had compensation cost for the Company's stock options been calculated based
upon the fair value at the date of grant, the Company's net loss and net loss
per share would have increased to the pro forma amounts shown in the table that
follows:

<TABLE>
<CAPTION>
                                  FOR THE PERIOD
                                       FROM
                                  AUGUST 29, 1997                                   NINE MONTHS ENDED
                                    (INCEPTION)       YEAR ENDED DECEMBER 31,         SEPTEMBER 30,
                                      THROUGH         -----------------------    -----------------------
                                 DECEMBER 31, 1997      1998          1999          1999          2000
                                 -----------------    ---------    ----------    -----------    --------
                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                                                                 (UNAUDITED)
<S>                              <C>                  <C>          <C>           <C>            <C>
Net loss:
  As reported..................        $(548)          $(7,928)     $(11,286)      $(8,915)     $ (7,799)
  Pro forma....................         (548)           (7,943)      (11,313)       (8,926)       (7,819)
Basic and diluted net loss per
  share:
  As reported..................        $  --           $    --      $     --       $    --      $(117.96)
  Pro forma....................           --                --            --            --       (118.42)
</TABLE>

     The fair value of each option grant is estimated at the grant date using
the minimum value method, assuming an expected option term of four years, no
dividend yield, and risk-free interest rates of 4.43% to 5.54%, 5.11% to
5.86%and 5.86% to 6.20% for the years ended December 31, 1998 and 1999, and for
the nine months ended September 30, 2000, respectively.

DEFERRED STOCK COMPENSATION

     In the nine months ended September 30, 2000, the Company recorded
$8,170,000 of deferred stock compensation in accordance with APB No. 25, SFAS
No. 123 and EITF Issue No. 98-16 from the grant of stock options to employees,
directors and consultants. The difference between exercise price of the option
granted and the estimated fair value of common stock on the grant date is
recognized as deferred stock compensation. Stock compensation expense is being
recognized over the vesting period of the related options in accordance with FIN
No. 28. Total stock compensation expense for the nine months ended September 30,
2000 was $2,977,000.

                                      F-16
<PAGE>   91
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

401(K) SAVINGS PLAN

     In January 1998, the Company has established a qualified savings plan for
employees under Section 401(k) (the "401(k) Plan") of the Internal Revenue
Service Code, in which employees may defer as much as 15% of their pretax annual
salary up to the statutory limits. The 401(k) Plan permits discretionary
matching and profit sharing contributions to be made by the Company. As of
September 30, 2000, the Company has not made any contributions to the 401(k)
Plan.

NOTE 6 -- INCOME TAXES:

     On April 5, 2000, the Company became subject to the C corporation
provisions of the Internal Revenue Code. No provision or benefit for income
taxes has been recognized since April 5, 2000 as the Company has incurred net
operating losses.

     The significant components of deferred tax assets and liabilities are as
follows (in thousands):

<TABLE>
<CAPTION>
                                                              SEPTEMBER 30,
                                                                  2000
                                                              -------------
<S>                                                           <C>
Net operating loss carryforwards............................     $   753
Depreciation and amortization...............................         956
Research tax credit carryforwards...........................         269
Other.......................................................          83
                                                                 -------
     Total deferred tax assets..............................       2,061
Deferred interest income....................................        (402)
Less: Valuation allowance...................................      (1,659)
                                                                 -------
Net deferred taxes..........................................     $    --
                                                                 =======
</TABLE>

     The Company has provided a full valuation allowance for its deferred tax
assets at September 30, 2000 due to the uncertainty surrounding the future
realization of such assets.

     At September 30, 2000, the Company had state and federal net operating loss
carryforwards of $1,827,000 which expire in 2005 and 2020, respectively, and
federal and state research tax credit carryforwards of $269,000 which expire in
2020. Utilization of federal and state net operating loss and tax credit
carryforwards may be subject to an annual limitation due to the "change in
ownership" provisions of the Internal Revenue Code.

NOTE 7 -- RELATED PARTY TRANSACTIONS:

     In connection with forming the Company, SmithKline Beecham, Incyte and the
Company entered into several agreements during September 1997, including an
Operating Agreement (the "Operating Agreement") and a Master Strategic
Relationship Agreement (the "Master Agreement"). The Operating Agreement served
as the Company's by-laws while the Master Agreement documents certain specific
matters regarding the operation of the Company. During September 1997, the
Company issued 4,400,000 shares of Series A Preferred units to SmithKline
Beecham in exchange for an initial capital contribution of $4,000,000 in cash
and assets and a contractual commitment for additional cash contributions of
$11,000,000, which was received in two installments on April 15 and July 15,
1998. Concurrently, the Company issued 4,400,000 shares of Series B Preferred
units to Incyte in exchange for an initial capital contribution of $4,000,000 in
cash and a contractual commitment for additional cash contributions of
$6,000,000, which was received in two installments on April 15 and July 15,
1998.

                                      F-17
<PAGE>   92
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

     In addition to the above contributions, SmithKline Beecham has granted the
Company various exclusive and non-exclusive rights to develop certain diagnostic
tests using genes identified by SmithKline Beecham, including genes identified
by SmithKline Beecham from their collaboration with Human Genome Sciences, Inc.,
until June 2001. SmithKline Beecham has also granted the Company an exclusive
license for a number of diagnostic tests that are in late stage clinical
validation. Incyte has provided the Company with non-exclusive access to certain
of its gene sequence and expression databases for various exclusive and
non-exclusive rights to diagnostic and therapeutic applications until September
2003. The Company will pay royalties to Incyte and Human Genome Sciences on the
sale, if any, of certain products developed using their respective proprietary
databases. These non-cash assets received as capital contributions from
SmithKline Beecham and Incyte were recorded at zero value of which was equal to
the carrying value of such assets by SmithKline Beecham and Incyte.

     The Operating Agreement specified that the limited liability company would
merge into a C corporation at the earliest of (i) the eighteen month anniversary
of the Company's formation (March 1999); (ii) any time after January 1, 1999, if
the Company's cash balance falls below $2,000,000, or (iii) the mutual agreement
of SmithKline Beecham and Incyte. Pursuant to the Operating Agreement, the
conversion of the Company into a C corporation was deferred until completion of
the Series C Preferred Stock financing in April 2000.

     Pursuant to an Intercompany Services Agreement, SmithKline Beecham and
Incyte provided the Company with certain legal, financial and research and
development services. Charges to the Company for these services were based upon
either actual costs or rates charged to other customers for similar services.
Such amounts, which were charged to research and development, were $0 and
$86,000 in 1999 and 1998, respectively. The Company incurred similar costs from
Incyte, which were charged to research and development, of $72,000 and
$1,928,000 during the years ended December 31, 1998 and 1999, respectively.

     In February 1999, the Company entered into a license agreement with
SmithKline Beecham Clinical Laboratories, Inc. Following the terms and
conditions of this agreement, the Company received a non-refundable license fee
of $100,000, which was recognized as revenue in 1999.

     In July 1999, the Company issued two convertible notes payable in the
amount of $2,500,000 each to SmithKline Beecham and Incyte. The notes were due
and payable in April 2000, accruing interest at 5.6% per annum. Upon closing the
Series C financing, the note to SmithKline Beecham was converted to 322,580
shares of Series C Preferred Stock. Additionally, the Company paid interest of
$97,000 on the note to SmithKline Beecham and paid Incyte principal of
$2,500,000 and accrued interest of $97,000.

     In December 1999, the Company entered into a LifeArray Software License
Agreement with Incyte. Under this agreement, the Company has access to computer
software from Incyte for the processing and analysis of microarray expression
data for a period of 12 months, with the option to extend for an additional 12
month term. The license fee for the use of the software is $75,000 per year.

NOTE 8 -- SUBSEQUENT EVENTS:

EMPLOYEE STOCK PURCHASE PLAN

     The Company's Board of Directors adopted, subject to stockholder approval,
the 2000 Employee Stock Purchase Plan (the "2000 ESPP") on December   , 2000.
The Board has recommended that a total of 500,000 shares should be reserved for
issuance under the 2000 ESPP.

                                      F-18
<PAGE>   93
                                 DIADEXUS, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

2001 EQUITY INCENTIVE PLAN

     The Company's Board of Directors adopted, subject to stockholder approval,
the 2001 Equity Incentive Plan (the "2001 Plan") on December      , 2000 as a
successor equity plan to the 2000 Plan. Under the 2001 Plan, a total of
               shares of common stock have been reserved for issuance, including
               shares that remained reserved for issuance under the 2000 Plan.

     STOCK OPTIONS

     Subsequent to September 30, 2000, the Company granted options to purchase
814,813 shares of Common Stock at $1.80 per share. These grants will result in
deferred stock compensation of approximately $8,311,000 which will be recognized
over the vesting periods.

                                      F-19
<PAGE>   94

                                      LOGO

                                             Shares

                                     [LOGO]
                                  Common Stock
                          ---------------------------
                                   PROSPECTUS
                                            , 2001
                          ---------------------------

                                LEHMAN BROTHERS

                               CIBC WORLD MARKETS
                          PRUDENTIAL VECTOR HEALTHCARE
                        A UNIT OF PRUDENTIAL SECURITIES
                            FIDELITY CAPITAL MARKETS
<PAGE>   95

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

     The following table sets forth all costs and expenses, other than the
underwriting discounts and commissions, payable by the Registrant in connection
with the sale and distribution of the common stock being registered. All amounts
shown are estimates except for the Securities and Exchange Commission
registration fee, the NASD filing fee and the Nasdaq National Market application
fee.

<TABLE>
    <S>                                                           <C>
    Securities and Exchange Commission registration fee.........  $26,400
    NASD filing fee.............................................   10,500
    Nasdaq National Market listing fee..........................     *
    Blue sky qualification fees and expenses....................   12,500
    Printing and engraving expenses.............................     *
    Legal fees and expenses.....................................     *
    Accounting fees and expenses................................     *
    Director and officer liability insurance....................     *
    Transfer agent and registrar fees...........................     *
    Miscellaneous expenses......................................     *
                                                                  -------
              Total.............................................  $  *
                                                                  =======
</TABLE>

---------------
* To be completed by amendment.

ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Our Certificate of Incorporation in effect as of the date hereof, and our
Restated Certificate of Incorporation to be in effect upon the closing of this
offering (collectively, the "Certificate") provide that, except to the extent
prohibited by the Delaware General Corporation Law, as amended (the "DGCL"), the
Registrant's directors shall not be personally liable to the Registrant or its
stockholders for monetary damages for any breach of fiduciary duty as directors
of the Registrant. Under the DGCL, the directors have a fiduciary duty to the
Registrant which is not eliminated by this provision of the Certificate and, in
appropriate circumstances, equitable remedies such as injunctive or other forms
of nonmonetary relief will remain available. In addition, each director will
continue to be subject to liability under the DGCL for breach of the director's
duty of loyalty to the Registrant, for acts or omissions which are found by a
court of competent jurisdiction to be not in good faith or involving intentional
misconduct, for knowing violations of law, for actions leading to improper
personal benefit to the director, and for payment of dividends or approval of
stock repurchases or redemptions that are prohibited by the DGCL. This provision
also does not affect the directors' responsibilities under any other laws, such
as the federal securities laws. The Registrant may obtain liability insurance
for its officers and directors.

     Section 145 of the DGCL empowers a corporation to indemnify its directors
and officers and to purchase insurance with respect to liability arising out of
their capacity or status as directors and officers, provided that this provision
shall not eliminate or limit the liability of a director: (i) for any breach of
the director's duty of loyalty to the corporation or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) arising under Section 174 of the DGCL or (iv)
for any transaction from which the director derived an improper personal
benefit. The DGCL provides further that the indemnification permitted thereunder
shall not be deemed exclusive of any other rights to which the directors and
officers may be entitled under the corporation's bylaws, any agreement, a vote
of stockholders or otherwise. The Certificate eliminates the personal liability
of directors to the fullest extent permitted by Section 102(b)(7) of the DGCL
and provides that the Registrant may fully indemnify any person who was or is a
party or is threatened to be made a party to any threatened,
                                      II-1
<PAGE>   96

pending or completed action, suit or proceeding (whether civil, criminal,
administrative or investigative) by reason of the fact that such person is or
was a director or officer of the Registrant, or is or was serving at the request
of the Registrant as a director or officer of another corporation, partnership,
joint venture, trust, employee benefit plan or other enterprise, against
expenses (including attorney's fees), judgments, fines and amounts paid in
settlement actually and reasonably incurred by such person in connection with
such action, suit or proceeding.

ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES.

     (a) Since our inception in August 1997, we have issued and sold the
following unregistered securities:

          (1) In September 1997, we issued 4,400,000 units of diaDexus LLC, the
     predecessor to our company, to each of SmithKline Beecham and Incyte at a
     price per unit of $3.41 and $2.27 respectively. Each of SmithKline
     Beecham's units was converted into one share of Series A Preferred Stock
     and each of Incyte's units was converted into one share of Series B
     Preferred Stock upon our conversion from a limited liability company to a
     Delaware corporation immediately prior to the closing of our Series C
     Preferred Stock offering in April 2000. Also in connection with our
     incorporation, each of SmithKline Beecham and Incyte received 100 shares of
     our common stock.

          (2) In April 2000, we issued and sold 13,225,807 shares of Series C
     Preferred Stock to 79 investors for an aggregate consideration of
     $102,500,004.

          (3) In June 2000, we issued a warrant to Prudential Securities
     Incorporated to purchase 129,032 shares of Series C Preferred Stock at an
     exercise price per share of $7.75.

          (4) In November 2000, we issued and sold 50,000 shares of restricted
     common stock to our firm of outside counsel for an aggregate consideration
     of $60,000. These shares vest over a two-year period.

          (5) Since our inception and as of September 30, 2000, we have granted
     options to purchase 3,176,583 shares of common stock to employees,
     directors and consultants under our 2000 Equity Incentive Plan at exercise
     prices ranging from $0.35 to $1.30 per share. Of the options granted,
     2,287,250 remain outstanding, 207,042 shares of common stock have been
     purchased pursuant to exercises of stock options and 682,291 shares have
     been cancelled and returned to the 2000 Equity Incentive Plan as of
     September 30, 2000.

     The issuances of securities in the transactions described above were deemed
exempt from registration under the Securities Act in reliance on Section 4(2),
Regulation D or Rule 701 promulgated thereunder as transactions pursuant to
compensatory benefit plans and contracts relating to compensation. The
recipients of securities in each such transaction represented their intention to
acquire the securities for investment only and not with a view to or for sale in
connection with any distribution thereof and appropriate legends were affixed to
the share certificates and other instruments issued in such transactions. All
recipients either received adequate information about us or had access, through
employment or other relationships, to such information.

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

     (A) EXHIBITS.

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                      DESCRIPTION OF DOCUMENT
-------                     -----------------------
<C>       <S>
   1.1*   Form of Underwriting Agreement.
   2.1    Conversion Agreement, dated as of April 3, 2000, by and
          among diaDexus, LLC, SmithKline Beecham Corporation and
          Incyte Pharmaceuticals, Inc.
   3.1    Certificate of Incorporation.
   3.2    Certificate of Amendment to Certificate of Incorporation.
   3.3*   Form of Restated Certificate of Incorporation to be
          effective upon the closing of this offering.
</TABLE>

                                      II-2
<PAGE>   97

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                      DESCRIPTION OF DOCUMENT
-------                     -----------------------
<C>       <S>
   3.4    Bylaws.
   3.5*   Form of Restated Bylaws to be effective upon the closing of
          this offering.
   4.1*   Specimen stock certificate.
   4.2    Investors' Rights Agreement, dated as of April 6, 2000, by
          and among Registrant, SmithKline Beecham Corporation, Incyte
          Pharmaceuticals, Inc. and the investors listed on the
          signature pages thereto.
   5.1*   Opinion of Latham & Watkins.
  10.1    Form of Indemnification Agreement by and between Registrant
          and Registrant's directors and officers.
  10.2    2000 Equity Incentive Plan.
  10.3*   2001 Equity Incentive Plan.
  10.4*   2001 Employee Stock Purchase Plan.
  10.5    Warrant for the Purchase of Shares of Preferred Stock, dated
          as of June 1, 2000, by and between Registrant and Prudential
          Securities, Incorporated.
  10.6*   Employment Agreement by and between Registrant and Patrick
          Plewman.
  10.7    Amendment of Stock Option Awards, dated as of November 11,
          1999, by and between Registrant and Patrick Plewman.
  10.8    Employment Agreement, dated as of August 25, 1999, by and
          between Registrant and Sharon Tetlow.
  10.9    Amendment of Stock Option Awards, dated as of November 11,
          1999, by and between Registrant and Sharon Tetlow.
  10.10   Employment Agreement, dated as of December 1, 1999, by and
          between Registrant and Mohan Iyer.
  10.11   Consultantship Agreement, dated as of December 20, 1999, by
          and between Registrant and George Poste.
  10.12   Special Consultantship Agreement, dated as of January 18,
          2000, by and between Registrant and George Poste.
  10.13   Lease Agreement, dated as of June 26, 1997, by and among
          SmithKline Beecham Corporation, John Arrillaga and Richard
          T. Peery.
  10.14   Lease Assignment, dated as of December 11, 1997, by and
          among Registrant, SmithKline Beecham Corporation, John
          Arrillaga and Richard T. Peery.
  10.15   Master Strategic Relationship Agreement, dated as of
          September 2, 1997, by and among Registrant, SmithKline
          Beecham Corporation and Incyte Pharmaceuticals, Inc.
  10.16   Amendment No. 1 to the Master Strategic Relationship
          Agreement, dated as of January 15, 1998, by and among
          Registrant, SmithKline Beecham Corporation and Incyte
          Pharmaceuticals, Inc.
10.17+*   Collaboration and License Agreement, dated as of September
          2, 1997, by and among Registrant, SmithKline Beecham
          Corporation, SmithKline Beecham, plc and Incyte
          Pharmaceuticals, Inc.
  10.18   Amendment No. 1 to the Collaboration and License Agreement,
          dated as of February 1, 1998, by and among Registrant,
          SmithKline Beecham Corporation, SmithKline Beecham, plc and
          Incyte Pharmaceuticals, Inc.
10.19+*   Amendment No. 2 to the Collaboration and License Agreement,
          dated as of July 2, 1998, by and among Registrant,
          SmithKline Beecham Corporation, SmithKline Beecham, plc and
          Incyte Pharmaceuticals, Inc.
</TABLE>

                                      II-3
<PAGE>   98

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                      DESCRIPTION OF DOCUMENT
-------                     -----------------------
<C>       <S>
  10.20   Amendment to the Collaboration and License Agreement, dated
          as of May 4, 1999, by and among Registrant, SmithKline
          Beecham Corporation, SmithKline Beecham, plc and Incyte
          Pharmaceuticals, Inc.
10.21+*   Amendment No. 3 to the Collaboration and License Agreement,
          dated as of July 28, 1999, by and among Registrant, Quest
          Diagnostic Incorporated, SmithKline Beecham Corporation,
          SmithKline Beecham, plc and Incyte Pharmaceuticals, Inc.
  10.22   Amendment No. 4 to the Collaboration and License Agreement,
          dated as of February 17, 2000, by and among Registrant,
          SmithKline Beecham Corporation, SmithKline Beecham, plc and
          Incyte Pharmaceuticals, Inc.
  10.23   Amendment to the Collaboration and License Agreement, dated
          as of March 30, 2000, by and among Registrant, SmithKline
          Beecham Corporation, SmithKline Beecham, plc and Incyte
          Pharmaceuticals, Inc.
10.24+*   Collaborative Agreement, dated as of February 17, 2000, by
          and between Registrant and Incyte Pharmaceuticals, Inc.
10.25+*   GEM Services Agreement, dated as of November 1, 1998, by and
          between Registrant and Incyte Pharmaceuticals, Inc.
10.26+*   Amendment to GEM Services Agreement, September 27, 1999, by
          and between Registrant and Incyte Pharmaceuticals, Inc.
  10.27   LifeArray Software License Agreement by and between
          Registrant and Incyte Pharmaceuticals, Inc.
  10.28   Intercompany Services Agreement, dated as of September 2,
          1997, by and among Registrant, SmithKline Beecham
          Corporation, and Incyte Pharmaceuticals, Inc.
  10.29   DNA Microarray Technology Access Program Master Early Access
          Agreement, dated as of August 23, 2000, by and between
          Registrant and Agilent Technologies, Inc.
10.30+*   Collaboration and License Agreement, dated as of November
          15, 1999, by and between Registrant and Biosite Diagnostics
          Incorporated.
10.31+*   License Agreement, dated as of September 21, 1998, by and
          between Registrant and Cancer Research Campaign Technology
          Limited.
10.32+*   License Agreement, dated as of February 10, 1999, by and
          between Registrant and SmithKline Beecham Clinical
          Laboratories, Inc.
10.33+*   Research Agreement, dated as of July 11, 2000, by and
          between Registrant and Sloan-Kettering Institute for Cancer
          Research.
10.34+*   Collaborative Research Agreement, dated as of October 1,
          2000, by and between Registrant and University of Pittsburgh
          of the Commonwealth System of Higher Education.
  23.1    Consent of PricewaterhouseCoopers LLP, independent
          accountants.
  23.2*   Consent of Latham & Watkins (included in Exhibit 5.1).
  24.1    Power of Attorney (included on signature page).
  27.1    Financial Data Schedule.
</TABLE>

---------------
* To be filed by amendment.

+ Registrant has requested confidential treatment pursuant to Rule 406 for a
  portion of the referenced exhibit and has separately filed such exhibit with
  the Commission.

                                      II-4
<PAGE>   99

     (b) FINANCIAL STATEMENT SCHEDULES.

     Not applicable.

     Schedules not listed above have been omitted because the information
required to be set forth therein is not applicable or is shown in the financial
statements or notes thereto.

ITEM 17.  UNDERTAKINGS

     The undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing specified in the Underwriting Agreement certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.

     Insofar as indemnification by the Registrant for liabilities arising under
the Securities Act may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the provisions referenced in Item 14 of
this Registration Statement or otherwise, the Registrant has been advised that
in the opinion of the Commission such indemnification is against public policy
as expressed in the Securities Act, and is therefore unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by the Registrant of expenses incurred or paid by a director, officer,
or controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered hereunder, the Registrant
will, unless in the opinion of its counsel the matter has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the
question whether such indemnification by it is against public policy as
expressed in the Securities Act and will be governed by the final adjudication
of such issue.

     The undersigned registrant hereby undertakes that:

          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of Prospectus filed as part of
     this Registration Statement in reliance upon Rule 430A and contained in the
     form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective; and

          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of Prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at the time shall be
     deemed to be the initial bona fide offering thereof.

                                      II-5
<PAGE>   100

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act, the Registrant has duly
caused this registration statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in Santa Clara, State of California, on
November 20, 2000.

                                          DIADEXUS, INC.

                                          By:      /s/ PATRICK PLEWMAN
                                            ------------------------------------
                                          Name: Patrick Plewman
                                          Title:  Chief Executive Officer,
                                                  President
                                                  and Chief Operating Officer

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Patrick Plewman and Sharon Tetlow,
and each of them acting individually, as his or her true and lawful
attorneys-in-fact and agents, each with full power of substitution, for him or
her in any and all capacities, to sign any and all amendments to this
Registration Statement (including post-effective amendments or any abbreviated
registration statement and any amendments thereto filed pursuant to Rule 462(b)
increasing the number of securities for which registration is sought), and to
file the same, with all exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents, with full power of each to act alone, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in connection therewith, as fully for all intents and
purposes as he or she might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or his or her substitute
or substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated:

<TABLE>
<CAPTION>
                     SIGNATURE                                   TITLE                     DATE
                     ---------                                   -----                     ----
<S>                                                  <C>                             <C>
                /s/ PATRICK PLEWMAN                  Chief Executive Officer,        November 20, 2000
---------------------------------------------------  President, Chief Operating
                  Patrick Plewman                    Officer and Director
                                                     (Principal Executive Officer)

               /s/ SHARON E. TETLOW                  Vice President, Finance and     November 20, 2000
---------------------------------------------------  Chief Financial Officer
                 Sharon E. Tetlow                    (Principal Financial and
                                                     Accounting Officer)

                 /s/ GEORGE POSTE                    Chairman of the Board of        November 20, 2000
---------------------------------------------------  Directors
                   George Poste

                 /s/ LOUIS C. BOCK                   Director                        November 20, 2000
---------------------------------------------------
                   Louis C. Bock
</TABLE>

                                      II-6
<PAGE>   101

<TABLE>
<CAPTION>
                     SIGNATURE                                   TITLE                     DATE
                     ---------                                   -----                     ----
<S>                                                  <C>                             <C>
                /s/ RANDY W. SCOTT                   Director                        November 20, 2000
---------------------------------------------------
                  Randy W. Scott

                /s/ TADATAKA YAMADA                  Director                        November 20, 2000
---------------------------------------------------
                  Tadataka Yamada
</TABLE>

                                      II-7
<PAGE>   102

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                      DESCRIPTION OF DOCUMENT
-------                     -----------------------
<C>       <S>
   1.1*   Form of Underwriting Agreement.
   2.1    Conversion Agreement, dated as of April 3, 2000, by and
          among diaDexus, LLC, SmithKline Beecham Corporation and
          Incyte Pharmaceuticals, Inc.
   3.1    Certificate of Incorporation.
   3.2    Certificate of Amendment to Certificate of Incorporation.
   3.3*   Form of Restated Certificate of Incorporation to be
          effective upon the closing of this offering.
   3.4    Bylaws.
   3.5*   Form of Restated Bylaws to be effective upon the closing of
          this offering.
   4.1*   Specimen stock certificate.
   4.2    Investors' Rights Agreement, dated as of April 6, 2000, by
          and among Registrant, SmithKline Beecham Corporation, Incyte
          Pharmaceuticals, Inc. and the investors listed on the
          signature pages thereto.
   5.1*   Opinion of Latham & Watkins.
  10.1    Form of Indemnification Agreement by and between Registrant
          and Registrant's directors and officers.
  10.2    2000 Equity Incentive Plan.
  10.3*   2001 Equity Incentive Plan.
  10.4*   2001 Employee Stock Purchase Plan.
  10.5    Warrant for the Purchase of Shares of Preferred Stock, dated
          as of June 1, 2000, by and between Registrant and Prudential
          Securities, Incorporated.
  10.6*   Employment Agreement by and between Registrant and Patrick
          Plewman.
  10.7    Amendment of Stock Option Awards, dated as of November 11,
          1999, by and between Registrant and Patrick Plewman.
  10.8    Employment Agreement, dated as of August 25, 1999, by and
          between Registrant and Sharon Tetlow.
  10.9    Amendment of Stock Option Awards, dated as of November 11,
          1999, by and between Registrant and Sharon Tetlow.
  10.10   Employment Agreement, dated as of December 1, 1999, by and
          between Registrant and Mohan Iyer.
  10.11   Consultantship Agreement, dated as of December 20, 1999, by
          and between Registrant and George Poste.
  10.12   Special Consultantship Agreement, dated as of January 18,
          2000, by and between Registrant and George Poste.
  10.13   Lease Agreement, dated as of June 26, 1997, by and among
          SmithKline Beecham Corporation, John Arrillaga and Richard
          T. Peery.
  10.14   Lease Assignment, dated as of December 11, 1997, by and
          among Registrant, SmithKline Beecham Corporation, John
          Arrillaga and Richard T. Peery.
  10.15   Master Strategic Relationship Agreement, dated as of
          September 2, 1997, by and among Registrant, SmithKline
          Beecham Corporation and Incyte Pharmaceuticals, Inc.
  10.16   Amendment No. 1 to the Master Strategic Relationship
          Agreement, dated as of January 15, 1998, by and among
          Registrant, SmithKline Beecham Corporation and Incyte
          Pharmaceuticals, Inc.
</TABLE>
<PAGE>   103

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                      DESCRIPTION OF DOCUMENT
-------                     -----------------------
<C>       <S>
10.17+*   Collaboration and License Agreement, dated as of September
          2, 1997, by and among Registrant, SmithKline Beecham
          Corporation, SmithKline Beecham, plc and Incyte
          Pharmaceuticals, Inc.
  10.18   Amendment No. 1 to the Collaboration and License Agreement,
          dated as of February 1, 1998, by and among Registrant,
          SmithKline Beecham Corporation, SmithKline Beecham, plc and
          Incyte Pharmaceuticals, Inc.
10.19+*   Amendment No. 2 to the Collaboration and License Agreement,
          dated as of July 2, 1998, by and among Registrant,
          SmithKline Beecham Corporation, SmithKline Beecham, plc and
          Incyte Pharmaceuticals, Inc.
  10.20   Amendment to the Collaboration and License Agreement, dated
          as of May 4, 1999, by and among Registrant, SmithKline
          Beecham Corporation, SmithKline Beecham, plc and Incyte
          Pharmaceuticals, Inc.
10.21+*   Amendment No. 3 to the Collaboration and License Agreement,
          dated as of July 28, 1999, by and among Registrant, Quest
          Diagnostic Incorporated, SmithKline Beecham Corporation,
          SmithKline Beecham, plc and Incyte Pharmaceuticals, Inc.
  10.22   Amendment No. 4 to the Collaboration and License Agreement,
          dated as of February 17, 2000, by and among Registrant,
          SmithKline Beecham Corporation, SmithKline Beecham, plc and
          Incyte Pharmaceuticals, Inc.
  10.23   Amendment to the Collaboration and License Agreement, dated
          as of March 30, 2000, by and among Registrant, SmithKline
          Beecham Corporation, SmithKline Beecham, plc and Incyte
          Pharmaceuticals, Inc.
10.24+*   Collaborative Agreement, dated as of February 17, 2000, by
          and between Registrant and Incyte Pharmaceuticals, Inc.
10.25+*   GEM Services Agreement, dated as of November 1, 1998, by and
          between Registrant and Incyte Pharmaceuticals, Inc.
10.26+*   Amendment to GEM Services Agreement, September 27, 1999, by
          and between Registrant and Incyte Pharmaceuticals, Inc.
  10.27   LifeArray Software License Agreement 1999, by and between
          Registrant and Incyte Pharmaceuticals, Inc.
  10.28   Intercompany Services Agreement, dated as of September 2,
          1997, by and among Registrant, SmithKline Beecham
          Corporation, and Incyte Pharmaceuticals, Inc.
  10.29   DNA Microarray Technology Access Program Master Early Access
          Agreement, dated as of August 23, 2000, by and between
          Registrant and Agilent Technologies, Inc.
10.30+*   Collaboration and License Agreement, dated as of November
          15, 1999, by and between Registrant and Biosite Diagnostics
          Incorporated.
10.31+*   License Agreement, dated as of September 21, 1998, by and
          between Registrant and Cancer Research Campaign Technology
          Limited.
10.32+*   License Agreement, dated as of February 10, 1999, by and
          between Registrant and SmithKline Beecham Clinical
          Laboratories, Inc.
10.33+*   Research Agreement, dated as of July 11, 2000, by and
          between Registrant and Sloan-Kettering Institute for Cancer
          Research.
10.34+*   Collaborative Research Agreement, dated as of October 1,
          2000, by and between Registrant and University of Pittsburgh
          of the Commonwealth System of Higher Education.
  23.1    Consent of PricewaterhouseCoopers LLP, independent
          accountants.
  23.2*   Consent of Latham & Watkins (included in Exhibit 5.1).
</TABLE>
<PAGE>   104

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                      DESCRIPTION OF DOCUMENT
-------                     -----------------------
<C>       <S>
  24.1    Power of Attorney (included on signature page).
  27.1    Financial Data Schedule.
</TABLE>

---------------
* To be filed by amendment.

+ Registrant has requested confidential treatment pursuant to Rule 406 for a
  portion of the referenced exhibit and has separately filed such exhibit with
  the Commission.


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