ALTAREX CORP
6-K, 1999-04-30
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                        
                                    FORM 6-K
                                        
                        REPORT OF FOREIGN PRIVATE ISSUER
                        PURSUANT TO RULE 13a-16a, 15d-16
                     OF THE SECURITIES EXCHANGE ACT OF 1934

For the Month of April, 1999

ALTAREX CORP.
(Exact name of Registrant as specified in its charter)

CAMPUS TOWER
#300, 8625 - 112 STREET
EDMONTON, ALBERTA, CANADA T6G 1K8
(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports
under cover Form 20-F or Form 40-F.

Form 20-F     X       Form 40-F   
            -----                 -----

Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.


Yes           No    X
     -----        -----
<PAGE>   2
     On April 27, 1999, Altarex Corp. (the "Company") issued a press release
announcing that it had filed its Final Prospectus with regulatory authorities
in certain provinces of Canada for a public offering of up to 34,000,000 of its
Common Shares.


                                        
                               INDEX TO EXHIBITS


EXHIBIT NO.              DESCRIPTION

 99.1                    Press Release dated April 27, 1999
 99.2                    Final Prospectus of AltaRex Corp, dated April 27, 1999

<PAGE>   3
     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Company has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.


                              ALTAREX CORP.

                              By: /s/ Edward M. Fitzgerald
                                  ----------------------------------

                              Name: Edward M. Fitzgerald

                              Title: Senior Vice President and Chief
                                     Financial Officer

                              Date: April 29, 1999


<PAGE>   1
                                                                    EXHIBIT 99.1


Contact:
Edward M. Fitzgerald or                           Gretchen L. P. Schweitzer or
Glenn Neumann                                     Megan E. Burling
AltaRex Corp.                                     Feinstein Kean Partners
781-672-0138                                      617-577-8110
[email protected]                                  www.fkpi.com
www.altarex.com


FOR IMMEDIATE RELEASE


       ALTAREX FILES FINAL PROSPECTUS FOR FINANCING OF UP TO C$17 MILLION


WALTHAM, MA, APRIL 27, 1999 - ALTAREX CORP. (AXO:TSE) today announced that it
has filed a Final Prospectus with regulatory authorities in certain provinces of
Canada for a public offering of up to 34 million Common Shares. The offering has
been priced at C$0.50 per share, resulting in estimated gross proceeds of up to
C$17 million. The proceeds of the offering will be used primarily to fund the
antibody and clinical trial costs of the Company's lead products OvaRex(TM) MAb,
for ovarian cancer and BrevaRex(TM) MAb for multiple myeloma.

The Company has entered into an agency agreement with First Marathon Securities
Limited, as lead agent, and HSBC James Capel Canada Inc. (the "Agents") to
conduct the offering on a best efforts basis. The agency agreement also grants
the Agents an option exercisable for 60 days following closing to purchase an
additional 5.1 million Common Shares, or up to C$2.5 million in gross proceeds,
to cover over-allotments. Subject to regulatory approval, the closing is
expected to occur on or about May 6, 1999.

AltaRex Corp. is an emerging biotechnology company focused on research,
development and commercialization of unique antibody-based immunotherapeutics
for the treatment of late-stage cancers. The Company's products are based on its
unique proprietary platform technology, Anti-idiotype Induction Therapy
("AIT(R)"). The Company believes that its AIT(R) technology enhances the ability
of the human immune system to produce its own anti-tumor response. AIT(R)
products are developed to target specific antigens that are associated with
various cancers. The Company's most advanced product, OvaRex(TM) MAb for ovarian
cancer, is in two potentially pivotal Phase IIb clinical trials, while
BrevaRex(TM) MAb is in a Phase I study.

                                    --more--
<PAGE>   2
                                                         Page 2 - April 27, 1999


Additional information about AltaRex and its clinical trials can be found on its
web site at www.altarex.com or on the CenterWatch web site at
www.centerwatch.com. Additional information about ovarian cancer can be found at
www.corrineboyerfund.org and at www.ovarian.org.

This news release contains forward-looking statements that involve risks and
uncertainties, which may cause actual results to differ materially from the
statements made. For this purpose, any statements that are contained herein that
are not statements of historical fact may be deemed to be forward- looking
statements. Without limiting the foregoing, the words `believes`, `anticipates`,
`plans`, `intends`, `expects` and similar expressions are intended to identify
forward-looking statements. Such factors include, but are not limited to
changing market conditions, completion of clinical trials, patient enrollment
rates, uncertainty of preclinical trial results, the establishment of new
corporate alliances, the timely development, regulatory approval and market
acceptance of the Company's products, and other risks detailed from time-to-time
in the Company's filings with the United States Securities and Exchange
Commission and Canadian securities authorities.

               THE TORONTO STOCK EXCHANGE HAS NEITHER APPROVED NOR
                DISAPPROVED OF THE INFORMATION CONTAINED HEREIN.

     NOT FOR DISTRIBUTION TO THE U.S. NEWS WIRE SERVICE OR DISSEMINATION IN
                               THE UNITED STATES

                                       ###

<PAGE>   1
                                                                    EXHIBIT 99.2


This prospectus constitutes a public offering of these securities only in those
jurisdictions where they may be lawfully offered for sale and therein only by
persons permitted to sell such securities. No securities commission or similar
authority in Canada has in any way passed upon the merits of the securities
offered hereunder and any representation to the contrary is an offence. The
securities offered hereby have not been and will not be registered under the
United States Securities Act of 1933, as amended, and, subject to certain
exceptions, may not be offered, sold or delivered, directly or indirectly, in
the United States of America, its territories or possessions. See "Plan of
Distribution".

NEW ISSUE                                                         April 27, 1999

                                     [LOGO]
                                    ALTAREX


                                  ALTAREX CORP.

                                   $17,000,000
                            34,000,000 Common Shares

This offering consists of a new issue of up to 34,000,000 common shares ("Common
Shares") of AltaRex Corp. (the "Corporation" or "AltaRex") being issued and sold
by the Corporation at a price of $0.50 per Common Share.

The offering price of the Common Shares was determined by negotiation between
First Marathon Securities Limited, HSBC James Capel Canada Inc. (together, the
"Agents") and the Corporation.

The Common Shares will not be precluded as investments under certain statutes as
set out under "Eligibility for Investment".

AN INVESTMENT IN THE COMMON SHARES INVOLVES A HIGH DEGREE OF RISK, SHOULD BE
REGARDED AS SPECULATIVE AND IS BEST SUITED FOR INVESTORS WHO CAN AFFORD THE LOSS
OF THEIR INVESTMENT IN COMMON SHARES. SEE "RISK FACTORS".

The outstanding Common Shares are listed on The Toronto Stock Exchange (the
"TSE") and the TSE has conditionally approved the listing of the Common Shares
offered pursuant to this prospectus, subject to the fulfilment by the
Corporation of certain requirements of the TSE. On April 26, 1999, the last
trading day prior to the filing of this prospectus, the closing price of the
Common Shares on The Toronto Stock Exchange was $0.55.




                          PRICE: $0.50 PER COMMON SHARE




<TABLE>
<CAPTION>
                                                          PRICE TO              AGENTS'               NET PROCEEDS TO
                                                         THE PUBLIC             FEE(1)              THE CORPORATION(2)
                                                         ----------             ------              ------------------
<S>                                                     <C>                   <C>                      <C>
Per Common Share....................................       $0.50                $0.035                    $0.465
Total(3)............................................    $17,000,000           $1,190,000               $ 15,810,000
</TABLE>


(1)  This assumes the maximum fees payable by the Corporation to the Agents. In
     addition to the Agents' fee, AltaRex has agreed to grant to the Agents
     options ("Compensation Options") equal to 5% of the total number of Common
     Shares sold pursuant to this offering at an exercise price of $0.50. This
     prospectus also qualifies the distribution of the Compensation Options and
     the Common Shares issuable upon exercise of the Compensation Options. See
     "Plan of Distribution".

(2)  Before deducting expenses of the offering, estimated at $510,000 ,which
     will be paid out of the proceeds of the offering.

(3)  The Corporation has granted the Agents an option (the "Over-Allotment
     Option") to purchase up to an additional 5,100,000 Common Shares at the
     offering price for a period expiring 60 days following the date of closing
     of this offering, to cover over-allotments, if any. This prospectus also
     qualifies the distribution of the Over-Allotment Option and the Common
     Shares issuable upon exercise of the Over-Allotment Option. If the
     Over-Allotment Option is exercised in full, the total price to the public,
     the Agents' fee and the net proceeds to the Corporation will be
     $19,550,000, $1,368,500 and $18,181,500, respectively. See "Plan of
     Distribution".
<PAGE>   2
The Agents conditionally offer for sale the Common Shares offered hereunder on a
best efforts basis, if, as and when issued and delivered by the Corporation and
accepted by the Agents in accordance with the conditions contained in the agency
agreement between the Agents and the Corporation referred to under "Plan of
Distribution" and subject to the approval of certain legal matters on behalf of
the Corporation by McCarthy Tetrault and on behalf of the Agents by Fogler,
Rubinoff, Toronto.

Subscriptions will be received subject to rejection or allotment, in whole or in
part, and the right is reserved to close the subscription books at any time
without notice. Certificates for the Common Shares will be available for
delivery at the closing, which is expected to occur on or about May 6, 1999, or
such later date as the Corporation and the Agents may agree but, in any event,
not later than June 27, 1999.
<PAGE>   3
                                TABLE OF CONTENTS


                                                PAGE

ELIGIBILITY FOR INVESTMENT ....................    1
GLOSSARY ......................................    2
SUMMARY .......................................    5
ALTAREX CORP ..................................    8
Corporate Structure ...........................    8
History .......................................    8
BUSINESS OF ALTAREX ...........................    8
Overview ......................................    8
Business Strategy .............................    9
Plan of Operation For Fiscal 1999 .............   10
Market for Cancer Therapeutics ................   10
Approaches to Cancer Therapy ..................   11
The Corporation's AIT(R) Technology ...........   13
The Corporation's Products ....................   14
Regulatory Approval Process ...................   19
Strategic Alliances and License Agreements ....   21
Manufacturing .................................   24
Human Resources ...............................   24
Leased Properties .............................   24
Competition ...................................   25
Proprietary Protection ........................   25
Clinical Advisory Board .......................   26
CONSOLIDATED CAPITALIZATION ...................   28
MANAGEMENT'S DISCUSSION AND
ANALYSIS OF FINANCIAL
         CONDITION AND RESULTS OF
         OPERATIONS ...........................   28
Introduction ..................................   28
Selected Financial Information ................   29
Overview ......................................   29
Acquisition and Amalgamation ..................   29
Results of Operations .........................   30
Year ended December 31, 1998 compared
         to year ended December 31, 1997 ......   30
Year ended December 31, 1997 compared
         to year ended December 31, 1996 ......   31
Foreign Currency Exposure .....................   31
Impact of the Year 2000 Issue .................   31
Liquidity and Capital Resources ...............   32
PLAN OF DISTRIBUTION ..........................   33
USE OF PROCEEDS ...............................   34
DIRECTORS AND OFFICERS ........................   34
Directors .....................................   34
Executive Officers ............................   35
Biographies of Directors and Executive
Officers ......................................   35
Audit Committee ...............................   37
EXECUTIVE COMPENSATION ........................   38


Compensation of Executive Officers ............   38
Stock Options .................................   39
Employment Agreements .........................   40
Compensation of Directors .....................   40
INDEBTEDNESS OF DIRECTORS
         AND OFFICERS .........................   40
STOCK OPTIONS .................................   41
DESCRIPTION OF SHARE CAPITAL ..................   43
DIVIDEND POLICY ...............................   44
PRINCIPAL SHAREHOLDERS ........................   44
PRICE RANGE AND TRADING VOLUME OF
         THE COMMON SHARES ....................   45
CANADIAN FEDERAL INCOME TAX
         CONSEQUENCES .........................   45
Dividends .....................................   46
Disposition of Common Shares ..................   46
RISK FACTORS ..................................   47
Biomira Litigation ............................   47
Possible Expiration or Termination of License
         Agreement for MAb B43;
         Loss of Exclusivity ..................   47
Reliance on Strategic Relationships ...........   48
Uncertainty Associated with Preclinical
         and Clinical Testing .................   49
Lack of Product Revenues; History of Losses ...   49
Capital Requirements ..........................   50
Key Personnel .................................   51
Regulatory Environment; No Assurance of
         Product Approval .....................   51
Competition ...................................   51
Proprietary Rights and Patent Protection ......   52
Manufacturing and Marketing ...................   53
Product Liability and Insurance ...............   54
Unstable Share Price ..........................   54
No Assurance of Successful Development ........   54
INTERESTS OF MANAGEMENT AND OTHERS
         IN MATERIAL TRANSACTIONS .............   54
MATERIAL CONTRACTS ............................   55
ESCROWED SHARES ...............................   55
LEGAL MATTERS .................................   56
LEGAL PROCEEDINGS .............................   56
AUDITORS, TRANSFER AGENT
         AND REGISTRAR ........................   58
PROMOTERS .....................................   58
PURCHASERS' STATUTORY RIGHTS ..................   58
CONSOLIDATED FINANCIAL STATEMENTS
         OF ALTAREX  CORP .....................   F-1
CERTIFICATE OF ALTAREX CORP ...................   80
CERTIFICATE OF AGENTS .........................   81
<PAGE>   4
                           ELIGIBILITY FOR INVESTMENT


         In the opinion of McCarthy Tetrault, counsel to the Corporation, and
Fogler, Rubinoff, counsel to the Agents, subject to compliance with the prudent
investment standards and general investment provisions and restrictions of the
statutes referred to below (and, where applicable, the regulations thereunder)
and, in certain cases, subject to the satisfaction of additional requirements
relating to investment or lending policies, procedures or goals, the Common
Shares offered hereunder will not, as of the date of issuance, be precluded as
investments under the following statutes:

<TABLE>
<S>                                                      <C>
Insurance Companies Act (Canada)                         Pension Benefits Act (Ontario)
Pension Benefits Standards Act, 1985 (Canada)            Loan and Trust Corporations Act (Ontario)
Trust and Loan Companies Act (Canada)                             An Act respecting trust companies and savings
Financial Institutions Act (British Columbia)             companies (Quebec) (except trust companies
Pension Benefits Standards Act (British Columbia)        with respect to funds, other than deposits,
Loan and Trust Corporations Act (Alberta)                which are administered for other purposes)
Alberta Heritage Savings Trust Funds Act (Alberta)       Supplemental Pension Plans Act (Quebec)
Employment Pension Plans Act (Alberta)                   An Act respecting insurance (Quebec) (in
Insurance Act (Alberta)                                  respect of insurers other than guarantee fund
The Insurance Act (Manitoba)                             corporations)
The Trustee Act (Manitoba)
</TABLE>

         In addition, in the opinion of such counsel, the Common Shares offered
by this prospectus, if listed on a prescribed stock exchange in Canada and if
issued on the date hereof, would be qualified investments under the Income Tax
Act (Canada) and the regulations under that Act for trusts governed by
registered retirement savings plans, registered retirement income funds or
deferred profit sharing plans (collectively "deferred income plans"). Assuming
draft legislation released by the Minister of Finance on March 10, 1999 is
enacted as proposed, the Common Shares will also be qualified investments for
registered education savings plans. The Common Shares offered by this
prospectus, if issued on the date hereof, would not, on the date of this
prospectus, be foreign property for purposes of the provisions of the tax
imposed under Part XI of the Income Tax Act (Canada) on deferred income plans,
registered investments and other tax exempt entities, including most pension
funds or plans.
<PAGE>   5
                                    GLOSSARY


In this prospectus, the following terms have the following meanings unless the
context requires otherwise:

<TABLE>
<S>                                         <C>
Adjuvant:                                   An immunogenic substance administered with a vaccine to increase
                                            the immune response.

Amino Acids:                                The basic molecules that form proteins.

Antibody:                                   A protein agent developed in response to, and binding specifically
                                            with, an antigen.

Anti-idiotype Induction Therapy or          An immunotherapeutic antibody approach that induces the human
AIT(R) Technology or AIT(R):                immune system to produce its own anti-tumor response through
                                            several immune pathways.

Anti-idiotype Cascade or Network:           An in vivo immune response characterized by antibodies to
                                            antibodies resulting in antigen mimics and secondarily by native
                                            antibodies reactive to the same antigen as the antibody inducing the
                                            cascade.

Antigen:                                    A substance which elicits a specific immune response.

Ascites-derived material:                   Obtained from the fluid of the abdominal cavity of mice that have
                                            been implanted with cells that secrete the desired substance
                                            (antibody).

B-cell:                                     A form of immune cell that produces antibodies and is a
                                            precursor to a plasma cell.



Cell culture-derived material:              Obtained from the secretion of cells grown in artificial
                                            media, often in flasks or tanks.


Cellular response:                          An immune system response mediated by immune cells, often
                                            cytotoxic and antigen specific.

current Good Manufacturing                  Government promulgated guidelines governing the manufacture of
Practices or cGMP:                          human and animal drugs and biologicals.

Chemotherapy or chemotherapeutic:           Generally, the use of drugs in the treatment of disease.
                                            Specifically the use of cytotoxic drugs to treat cancer.

Cytokine:                                   Low molecular weight proteins that can either stimulate or inhibit
                                            the proliferation or function of immune cells.

Cytotoxic T-cells:                          Immune system cells capable of killing other cells.

Epitope:                                    Specific region on an antigen which is recognized by a specific
                                            antibody or T-cell.

European Medicines Evaluation               The agency responsible for drug product approval in the European
Agency or EMEA:                             Economic Community.

First line chemotherapy                     The administration of one or more of a combination of
(in ovarian cancer):                        chemotherapeutic agents usually consisting of a platinum-based
                                            drug and paclitaxel.

Gene:                                       The basic unit of heredity.  Genes are nucleic acid sequences
                                            encoding specific proteins that occupy a specific location on a
                                            chromosome and are self-producing, submicroscopic structures
                                            capable under certain circumstances of giving rise to a new
                                            character.

Health Protection Branch or HPB:            The government department responsible for supervising the drug
                                            development and approval process in Canada.

Humoral response:                           An immune response mediated by antibodies in the blood.

Hybridoma cells:                            Any continuously growing cell line generated by the fusion of a
                                            myeloma cell and a normal cell and capable of producing
                                            antibodies.
</TABLE>



                                       2
<PAGE>   6
<TABLE>
<S>                                         <C>
Immunogenicity:                             The degree to which an antigen is capable of eliciting an immune
                                            response.

Immunotherapy:                              A therapeutic approach to treat diseases by modifying the immune
                                            response against the disease.

Immunological tolerance:                    Characteristic state in which the immune system is rendered
                                            unresponsive to an antigen that, under other conditions,
                                            would provoke an immune response.

Investigational New Drug                    An application to the FDA or other regulatory bodies, which is
Application or IND:                         submitted for approval prior to beginning clinical trials.

IV infusion:                                Administration of a medication directly into a vein.

In vitro:                                   Studies or phenomena which take place outside the body.

In vivo:                                    Studies or phenomena which take place in the body.

Master Cell Bank or MCB:                    A well characterized stock containing specific hybridoma cells that
                                            are used in the manufacture of antibodies.

Master Working Cell Bank:                   "Manufacturer's" or "Master" Working Cell Bank, often referred
                                            to as the "Working Cell Bank" (WCB): a bank derived from the
                                            Master Cell Bank which acts as the
                                            starting source for (antibody)
                                            bioproduction.

Monoclonal antibody or MAb:                 Antibody produced by hybridoma cells, which is homogeneous in
                                            structure and specificity.

MUC1:                                       A mucinous antigen associated with breast and other cancers.

Multi-epitopic response:                    Immune response to an antigen that is directed to multiple
                                            regions on the antigen recognized by antibodies or T-cells.

Multiple myeloma:                           A haematologic malignancy or blood cancer related to leukemia
                                            and lymphoma characterized by over-production of abnormal
                                            plasma cells in the bone marrow.

Murine:                                     Of mouse origin.

Myeloma cell:                               An immortal tumor cell originating or derived from the bone
                                            marrow.

New Drug Application or NDA:                A document submitted to the FDA or other regulatory bodies
                                            containing all the pre-clinical and clinical data collected on a drug
                                            to obtain approval for marketing.

New Drug Submission or NDS:                 A document submitted to the HPB which is the Canadian
                                            counterpart to the NDA.

Peptide:                                    A molecule containing several amino acids linked together.

Pharmacodynamic:                            The biological response to a drug.

Pharmacokinetic:                            The description of absorption, distribution, metabolism and
                                            excretion of drugs by the body.

Plasma cell:                                A mature Bcell.

Potentially pivotal:                        A term used to describe clinical trials that would form the
                                            basis for a submission seeking marketing approval from
                                            regulatory authorities if the statistical goals of the trial
                                            are met.

Primary end point:                          The primary clinical outcome which forms the a priori basis of the
                                            statistical hypothesis (including sample size estimation) of a well
                                            controlled clinical trial.  A fully successful study confirms a
                                            treatment effect of the magnitude sufficient to provide a
                                            statistically significant demonstration of the "primary end point"
                                            for regulatory approval of a product.

Product License Application or              The application submitted to the FDA to qualify biological drug
PLA:                                        products for sale in the United States.

PSA:                                        An antigen associated with prostate cancer.
</TABLE>





                                       3
<PAGE>   7
<TABLE>
<S>                                         <C>
Sera:                                       The fluid component of blood after separation of cellular
                                            components.

Secondary end point:                        Secondary clinical or biological outcomes that can be
                                            assessed in analysis of a clinical trial. Although supportive
                                            and potentially important, these endpoints are not the a
                                            priori primary experimental question proposed for a clinical
                                            protocol.

Second-line chemotherapy                    Any one of a combination of drugs consisting of Paclitaxel,
(in ovarian cancer):                        Etoposide, CAP (cyclophosphamide, adriamycin, cis-platin) or
                                            HCAP (hexamethylmelamine and CAP) or other drugs
                                            administered into patients, who are either partial or non-responders
                                            to first line chemotherapy.

Surrogate endpoint:                         A laboratory or physical sign that is used in clinical trials
                                            as a substitute for a clinically meaningful endpoint that is
                                            a direct measure of how a patient feels, functions, or
                                            survives and that is reasonably likely to predict the effect
                                            of therapy.

Surrogate marker:                           A laboratory measurement of biological activity within the
                                            body that indirectly indicates the effect of treatment on
                                            disease state.

T-cell:                                     A form of immune cell that mediates humoral and cellular
                                            immune responses.

Tumor:                                      An abnormal proliferation of malignant cells.

Tumor antigen or tumor associated           An antigen that is predominantly expressed in tumor tissues and
antigen or TAA:                             may be released into the blood stream in association with the
                                            tumor.


Tumor marker:                               A biological product (protein or other) that is expressed on
                                            tumor cells and secreted usually into the serum, such that
                                            presence or activity of the tumor can be measured indirectly
                                            through measurement of the marker.

United States Food and Drug                 The regulatory body that oversees the drug development and
Administration or FDA:                      approval process in the United States.
</TABLE>



                                       4
<PAGE>   8
                                     SUMMARY

         The following is a summary only and is qualified in its entirety by the
more detailed information and financial statements, including the notes thereto,
appearing elsewhere in this prospectus. All dollar references in this prospectus
are in Canadian dollars unless otherwise specifically indicated. This prospectus
includes product names and trademarks of the Corporation and of other
organizations.

                                  THE OFFERING

<TABLE>
<S>                         <C>
ISSUE:                      Up to 34,000,000 common shares ("Common Shares") of AltaRex Corp. (the
                           "Corporation" or "AltaRex")

PRICE:                     $0.50 per Common Share

AMOUNT:                    $17,000,000

USE OF PROCEEDS:

                           The estimated net proceeds of the offering to the Corporation, after
                           deducting the Agents' fee and the estimated expenses of the offering of
                           approximately $510,000, will be $15.3 million. The Corporation intends to
                           use the net proceeds of this offering as follows:

                           OvaRex(TM) MAb antibody and clinical trial costs. . . . . . . .        $ 8.4
                           BrevaRex(TM) MAb antibody and clinical trial costs. . . . . . .          4.3
                           Working capital requirements. . . . . . . . . . . . . . . . . .          2.6
                                                                                                  -----
                                                   Total. . . . . . . . . . . . . . . . . .       $15.3
                                                   million                                        =====

                           In each case, the amounts referred to above reflect estimated antibody and
                           clinical trial costs over a period of approximately 12 months. To the extent
                           that the aggregate net proceeds are less than as set forth above, such
                           proceeds will be applied to fund OvaRex(TM) MAb antibody and clinical trial
                           costs in priority to BrevaRex(TM) MAb antibody and clinical trial costs. See
                           "Use of Proceeds".
</TABLE>

                               BUSINESS OF ALTAREX

         AltaRex is a development stage biotechnology company focused on the
research, development and commercialization of unique antibody-based
immunotherapeutics for the treatment of certain late-stage cancers. The
Corporation's products are based on its unique proprietary platform technology,
Anti-idiotype Induction Therapy or AIT(R) Technology. Based upon research and
clinical studies to date, AltaRex believes that its AIT(R) Technology enhances
the ability of the human immune system to produce its own anti-tumor response.
The Corporation has filed five patent applications under its AIT(R) Technology
in the United States. Four of these patents have been or will be the subject of
international patent applications. See "Business of AltaRex - Proprietary
Protection" and "Legal Proceedings".

         AltaRex's products are modified murine monoclonal antibodies or MAbs
developed by the Corporation's scientists or licensed to the Corporation. The
Corporation believes that these MAbs may be used effectively to complement
and/or supplement traditional cancer therapies. The Corporation's strategy is to
focus its antibody development expertise to produce unique, patent-protected,
antibody-based immunotherapeutics based on its AIT(R) Technology platform for
commercialization primarily


                                       5
<PAGE>   9
by pharmaceutical partners. The Corporation believes this strategy will enable
it to achieve patent-protected commercialization of antibody-based
immunotherapeutics to treat various cancers and other disease areas including
autoimmune diseases and infectious diseases. See "Business of AltaRex - Business
Strategy".

         OvaRex(TM) MAb, the Corporation's lead product, targets a tumor
associated antigen known as CA 125 which has been found to be over-expressed in
the majority of ovarian (and certain other) cancer patients. The Corporation
believes that when administered to patients in low dosages by IV infusion
OvaRex(TM) MAb acts by inducing or amplifying, through multiple mechanisms, the
body's immune response against ovarian cancer. In the first quarter of 1997, the
Corporation initiated a potentially pivotal North American Phase IIb clinical
trial in Canada with time to disease progression as the primary end point.
Administration of the drug to patients in the United States under this trial
began in the second quarter of 1998. This placebo controlled trial will enroll
280 patients by late 1999 and is expected to be completed in 2001 for primary
analysis. A second potentially pivotal Phase IIb clinical trial was initiated in
December 1998, also with time to disease progression as its primary end point,
and will address an ovarian cancer patient population with a more advanced stage
of disease than the initial Phase IIb trial. This placebo controlled trial will
enroll 102 patients in the United States and is also scheduled for completion by
2001. The Corporation has received Orphan Drug status and Fast Track designation
from the FDA for OvaRex(TM) MAb. Orphan Drug status and Fast Track designation,
as well as the applicability of certain provisions of the FDA Modernization Act
of 1997, form the Corporation's regulatory approval strategy in the United
States which centres on a surrogate measure of efficacy, being time to disease
progression, as a basis for regulatory approval. The Corporation's Phase IIb
trials have primary end points of time to disease progression as well as
secondary end points, including survival and quality of life, any of which can
form the basis for regulatory approval. See "Business of AltaRex - The
Corporation's Products - Overview" and "Legal Proceedings".

         The Corporation is developing additional antibody-based
immunotherapeutics from its AIT(R) Technology platform for the treatment of
tumors expressing the MUC1 (BrevaRex(TM) MAb), PSA (ProstaRex(TM) MAb) and
CA19.9 (GivaRex(TM) MAb) tumor associated antigens. The Corporation commenced a
Phase I clinical trial of BrevaRex(TM) MAb in December 1998.


                         SELECTED FINANCIAL INFORMATION

         The following selected financial information provided below has been
taken from the consolidated financial statements of AltaRex contained elsewhere
in this prospectus.

<TABLE>
<CAPTION>
                                      YEAR ENDED DECEMBER 31
                                      ----------------------
                                  1998           1997           1996
                                  ----           ----           ----
                                   ($)            ($)            ($)
INCOME STATEMENT DATA
<S>                           <C>            <C>            <C>
Revenues ..................     1,013,742      1,619,836         88,257
Expenses
 Research and development .     9,433,681      4,733,918      1,720,031
 General and administration     4,695,990      1,563,555        540,285
                              -----------    -----------    -----------
Net loss ..................   (13,115,929)    (4,677,637)    (2,172,059)
                              ===========    ===========    ===========
Net loss per common share .         (0.79)         (0.29)         (0.24)
                              ===========    ===========    ===========
</TABLE>



                                       6
<PAGE>   10
<TABLE>
<CAPTION>
                                                               AS AT DECEMBER 31
                                                       1998                        1997
                                                       ----                        ----

                                                        ($)                         ($)
<S>                                                   <C>                        <C>
BALANCE SHEET DATA
Total assets.................................         15,159,774                 27,299,744
Shareholders' equity.........................         12,646,840                 25,708,769
</TABLE>

                                  RISK FACTORS

         The acquisition of Common Shares offered hereunder entails certain
risks and any investment in Common Shares should be considered as being highly
speculative. See "Risk Factors" for a description of certain of the risks that
should be considered in assessing an investment in the Common Shares, including
the following: (i) litigation, including the Biomira Claim; (ii) the possible
expiration of the license agreement for MAb B43; loss of exclusivity; (iii)
reliance on strategic relationships; (iv) uncertainty associated with
preclinical and clinical testing; (v) lack of product revenues; history of
losses; (vi) capital requirements; (vii) dependence upon key personnel; (xiii)
regulatory environment; no assurance of product approval; (ix) competition; (x)
proprietary rights and patent protection; (xi) manufacturing and marketing;
(xii) product liability and insurance; (xiii) unstable share price; and (xiv) no
assurance of successful development. See "Risk Factors".



                                       7
<PAGE>   11
                                  ALTAREX CORP.

CORPORATE STRUCTURE

         AltaRex Corp. ("AltaRex" or the "Corporation") was established on May
31, 1997 under the laws of the Province of Alberta by the amalgamation of
AltaRex Corp. (formerly known as Allrich Energy Group Inc. ("Allrich")) and
AltaRex Inc. Prior to such amalgamation, Allrich, an inactive public company,
acquired all of the outstanding shares of AltaRex Inc. resulting in AltaRex
Inc.'s shareholders holding a controlling interest in Allrich. On June 27, 1997
articles of amendment were filed to provide that meetings of shareholders may be
held at any place within Canada and the United States. The registered office of
AltaRex is located at Campus Tower, Suite 300, 8625 - 112 Street, Edmonton,
Alberta T6G 2E1. The executive offices of AltaRex are located at Suite 125, 303
Wyman Street, Waltham, Massachusetts 02451.

         AltaRex US, Corp. ("AltaRex US"), the Corporation's only subsidiary,
was incorporated under the laws of the State of Delaware and is wholly-owned by
the Corporation. With offices located in Waltham, Massachusetts, AltaRex US
directs the executive, business development, clinical, regulatory, development,
manufacturing and investor relations efforts of the Corporation.

HISTORY

         AltaRex was founded in November 1995 by Dr. Antoine Noujaim and a team
of collaborators to commence a business engaged in the discovery and development
of anti-cancer immunotherapeutics. Prior to founding AltaRex, Dr. Noujaim was
President of Biomira Research Inc. ("Biomira Research"), a wholly-owned
subsidiary of Biomira Inc. ("Biomira"). The Company believes that in 1995
Biomira decided to discontinue funding the operations of Biomira Research. Dr.
Noujaim and other collaborators believed that the B43 antibody research project
undertaken by Biomira Research (known as the OvaRex(TM) MAb Program) had the
potential to be further developed into a commercial product. As a result, in
November 1995, AltaRex acquired certain components of the OvaRex(TM) MAb Program
and the OvaRex(TM) MAb tradename and trademark from Biomira and Biomira Research
and entered into an exclusive licensing agreement with Biomira pursuant to which
it acquired the exclusive worldwide right to use, develop, manufacture and
commercialize (for anti-idiotype induction therapy applications) products based
on the B43 antibody. See "Business of AltaRex - Strategic Alliances and License
Agreements - Biomira License Agreement" and "Legal Proceedings".


                               BUSINESS OF ALTAREX

OVERVIEW

         AltaRex is a development stage biotechnology company focused on the
research, development and commercialization of unique antibody-based
immunotherapeutics for the treatment of certain late-stage cancers. The
Corporation's products are based on its unique proprietary platform technology,
Anti-idiotype Induction Therapy or AIT(R) Technology. Based upon research and
clinical studies to date, AltaRex believes that its AIT(R) Technology enhances
the ability of the human immune system to produce its own anti-tumor response.
The Corporation has filed five patent applications for its AIT(R) Technology in
the United States. Four of these patents have been or will be the subject of
international patent applications. See "- Proprietary Protection" and "Legal
Proceedings".




                                       8
<PAGE>   12
         AltaRex's products are modified murine monoclonal antibodies or MAbs
developed by the Corporation's scientists or licensed to the Corporation. The
Corporation believes that these MAbs may be used effectively to complement
and/or supplement conventional cancer therapies.

         OvaRex(TM) MAb, the Corporation's lead product, targets a tumor
associated antigen known as CA 125 which has been found to be over-expressed in
the majority of ovarian (and certain other) cancer patients. The Corporation
believes that, when administered to patients in low dosages by IV infusion,
OvaRex(TM) MAb acts by inducing or amplifying, through multiple mechanisms, the
body's immune response against ovarian cancer. In the first quarter of 1997, the
Corporation initiated a potentially pivotal North American Phase IIb clinical
trial with OvaRex(TM) MAb in Canada with time to disease progression as the
primary end point. Administration of the drug to patients in the United States
under this trial began in the second quarter of 1998. This placebo controlled
trial will enroll 280 patients by late 1999 and is expected to be completed in
2001 for primary analysis. A second potentially pivotal Phase IIb clinical trial
was initiated in December 1998 also with time to disease progression as its
primary end point, and will address an ovarian cancer patient population with a
more advanced stage of disease than the initial Phase IIb trial. This placebo
controlled trial will enroll 102 patients in the United States and is also
scheduled for completion by 2001. AltaRex is also conducting open Phase II
trials in the United States and Canada. In consultation with regulatory
authorities, the Corporation is generating cell culture-derived antibody which
will be studied in comparability trials with the Corporation's current
ascites-derived materials.

         The Corporation has received Orphan Drug status and Fast Track
designation from the FDA for OvaRex(TM) MAb. Orphan Drug status and Fast Track
designation, as well as the applicability of certain provisions of the FDA
Modernization Act of 1997 ("FDAMA") relating to surrogate measures of efficacy
form the Corporation's regulatory approval strategy in the United States. The
Corporation's Phase IIb trials each have primary end points of time to disease
progression as well as secondary end points, including survival and quality of
life, any of which can form the basis for regulatory approval. See "- The
Corporation's Products".

         AltaRex is also developing additional antibody-based immunotherapeutics
from its AIT(R) Technology platform for the treatment of tumors expressing the
MUC1 (BrevaRex(TM) MAb), PSA (ProstaRex(TM) MAb) and CA19.9 (GivaRex(TM) MAb)
tumor associated antigens. The Corporation commenced a Phase I clinical trial of
BrevaRex(TM) MAb in December 1998.

BUSINESS STRATEGY

         The Corporation's strategy is to focus its antibody development
expertise to produce unique, patent-protected, antibody-based immunotherapeutics
based on its AIT(R) Technology platform for commercialization primarily by
pharmaceutical partners. The key elements of the Corporation's strategy are to:

     -    Focus exclusively on antibodies for immunotherapy;

     -    Access research regarding antibodies and disease targets from key
          academic institutions, particularly in Canada and the United States;

     -    Employ the AIT(R) Technology and related proprietary technology of the
          Corporation to generate highly specific immune responses to MAbs
          associated with TAAs;



                                       9
<PAGE>   13
     -    Coordinate further research and conduct preclinical and clinical
          trials to enable the Corporation to pursue regulatory approval for the
          products and to build value for strategic partnering; and

     -    Realize value through strategic partnerships with pharmaceutical
          companies.

         The Corporation believes that this strategy will enable it to achieve
the patent-protected commercialization of antibody-based immunotherapeutics to
treat various cancers and other disease areas including autoimmune and
infectious diseases.

PLAN OF OPERATION FOR FISCAL 1999

         AltaRex's plan of operation for the year ending December 31, 1999 is to
continue to develop and conduct clinical trials for antibody-based immunotherapy
products. During this period, the Corporation plans to complete enrollment in
the first OvaRex(TM) MAb Phase IIb clinical trial in North America and to
achieve significant progress in enrolling patients in the second Phase IIb
clinical trial. The Corporation also intends to substantially complete the
OvaRex(TM) MAb open Phase II trials in the United States and Canada and the
BrevaRex(TM) MAb Phase I clinical trial in the United States. Additionally, the
Corporation plans to continue product development programs for ProstaRex(TM) MAb
and GivaRex(TM) MAb by conducting further exploratory research. See "-
Regulatory Approval Process".

         In cooperation with Lonza Biologics plc ("Lonza Biologics"), the
Corporation is in the process of scaling-up commercial production of cell
culture-derived antibody to be used in comparability testing with the
Corporation's current ascites-derived material. The Corporation is also working
with Lonza Biologics to begin scaling-up its BrevaRex(TM) MAb cell culture
material to a commercial level. Scaling-up production of these antibodies will
enable the Corporation to further pursue regulatory approval and
commercialization of the Corporation's products. Such regulatory approval and
commercialization is dependent upon the ability of the Corporation to achieve
such production. See "Risk Factors".

MARKET FOR CANCER THERAPEUTICS

         Cancer is a disease characterized by uncontrolled growth and spread of
abnormal cells. The disease is believed to occur as a result of a number of
factors such as genetic predisposition and external (chemicals, radiation) and
internal (immune status, hormones) causes.

         Overall, the annual costs for cancer in the Untied States are estimated
at U.S. $107 billion which includes U.S. $37 billion for direct medical costs,
U.S. $11 billion for morbidity costs (loss of productivity) and U.S. $59 billion
for mortality cases. The world market for cancer therapeutics was U.S. $11.7
billion in 1997 and is expected to reach U.S. $14.7 billion by 2000. (SCRIP
Reports - The Complete Guide to Cancer - Second Edition, 1998). North America
(predominantly the United States) represents 47% of the worldwide anti-cancer
drug market.

       The majority of cancer patients are people over the age of 65 and it is
anticipated that as the population continues to age, cancer treatment will
likely become the single largest health care expenditure in the United States
and other industrialized nations (Frost and Sullivan, World Cancer Therapeutic
Markets, August 1996).



                                       10
<PAGE>   14
APPROACHES TO CANCER THERAPY

       Conventional approaches for the treatment of cancer have been based on a
combination of surgery, radiation and chemotherapy. Despite increasing resources
to develop new therapies for cancer, survival rates for cancer patients have not
materially improved over the last 15 years (American Cancer Society, 1998 Cancer
Facts & Figures). This ongoing inability to significantly improve survival or
quality of life for cancer patients creates a compelling need for alternative
medical strategies.

       The potential market for antibody-based therapies in the management of
advanced cancer has rapidly expanded, as evidenced by the acceptance of IDEC
Pharmaceuticals Corp.'s ("IDEC") Rituxan(R) (rituximab) for the treatment of
non-Hodgkin's lymphoma and the recent FDA approval of Genentech Inc.'s
("Genentech") Herceptin(R) (trastuzumab) for the treatment of certain breast
cancers.

       IMMUNOTHERAPEUTIC APPROACHES TO CANCER

       The immunological approach to cancer therapy is based on the principle
that the human immune system is capable of recognizing and eliminating cancer
cells. In cancer patients, the immune system has failed, for unknown reasons, to
respond to the presence of cancer cells. Immunotherapeutic approaches attempt to
stimulate and enhance an anti-cancer response by the patient's own immune
system.

       The immunotherapeutic approach has inherent advantages in comparison to
current conventional treatment practices, which are often radical in nature and
associated with severe side effects and toxicity, thereby compromising the
patient's quality of life. In addition, tumors treated conventionally often
re-emerge in more aggressive and treatment-resistant forms. Immunotherapy, which
can be utilized in combination with conventional treatments or as a single
treatment, can be substantially less toxic than chemotherapy and therefore may
improve the patient's quality of life.

       There are currently four widely accepted immunological approaches to
cancer therapy. They can be classified as either tumor associated antigen
dependent (e.g., passive immunization or active specific immunization) or
independent (e.g., adoptive cell-based or non-specific). The primary difference
between immunotherapeutic approaches is the method in which the immune system is
stimulated and the nature of the subsequent immune responses.

       CONVENTIONAL IMMUNOTHERAPEUTIC APPROACHES

       Independent Immunological Approaches

       Adoptive Immunotherapy

       This form of therapy consists of the separation and stimulation of
T-cells, then exposing those cells to immunostimulates in vitro in order to
augment the immune system's response to tumor cells. The treated cells are then
expanded in numbers and reinjected into patients. Each patient serves as the
donor and recipient of his or her own T-cells. While efforts are being conducted
to make this therapy more effective, wide application remains difficult due to
the individual nature of the treatment.



                                       11
<PAGE>   15
       Non-Specific Immunotherapy

       In general, this approach may be described as a method by which the
immune system is non-specifically stimulated in order to destroy the tumor. The
principal approach has been through the use of cytokines; however, while
effective in some indications, side effects have limited their use.

       TAA Immunological Approaches

       Tumor associated antigens or TAAs are located on the surface of cancer
cells, circulate in a patient's blood or sera and are associated with the
presence of specific cancer types. The antigens have single or multiple binding
sites or epitopes. There are two types of TAA immunotherapy, passive and active
specific.

       Passive Immunization

       This approach consists of the administration of certain immune molecules,
such as antibodies, to patients who do not produce them on their own. These
antibodies are generally administered in large quantities and, while targeting
the cancer cells, can also be designed to act on other cell types and molecules
which are necessary for tumor growth. For example, antibodies can be designed to
affect the tumor's blood supply, thereby inhibiting the tumor's expansion.
Alternatively, certain antibodies can act directly on the tumor by activating a
cellular system to attack the tumor after the antibody is attached to it. The
underlying assumption is that the antibody will recognize and bind to a
cancer-specific antigen which is not expressed on normal cells. Unfortunately,
some of the cancer antigens are also found on normal cells, which might also be
damaged at the same time.

       Active Specific Immunization

       Vaccines that are based on this therapeutic approach usually involve the
immunization of patients with irradiated tumor cells expressing a specific
antigen or by combining the antigen itself with an appropriate carrier molecule
and administering it together with an adjuvant. Modern variations to this
technique, include anti-idiotype antibody therapy, which consists of the
formation and selection of an antigen mimic in the form of an antibody that is
administered in the manner described above. While this technology holds promise,
the development of an effective vaccine is highly dependent on the accurate
pre-selection of the antigen or antigen mimic.

       ALTAREX'S ANTI-IDIOTYPE INDUCTION THERAPY

       The Corporation believes its AIT(R) approach to immunotherapy is
fundamentally different from the conventional approaches to immunotherapy
described above. AIT(R) Technology involves the development of a murine antibody
specific to a tumor associated antigen. This antibody is subsequently modified
by a proprietary technique and, after appropriate processing, is injected by IV
infusion into a patient. Multiple immunological pathways are then invoked. This
results in the formation of a complex between the antibody and the patient's own
circulating tumor antigens. The tumor antigen is thereby targeted for an immune
response. Mechanistic studies have demonstrated the induction of the
anti-idiotype network or cascade and, more particularly, of a reconformation of
the TAA presentation and humoral and cellular response to multiple epitopes of
the TAA. It is the


                                       12
<PAGE>   16
Corporation's belief that this in turn results in an immune response having
unique characteristics, mobilizing both cellular and humoral pathways against
the TAA and the tumor cells, triggered by a tumor antigen specific modified
murine monoclonal antibody.

THE CORPORATION'S AIT(R) TECHNOLOGY

       OVERVIEW

       The development of the Corporation's AIT(R) Technology and related
products has been facilitated by advances in the field of oncology that have
demonstrated the existence of cellular components known as tumor associated
antigens.

       The AIT(R) Technology is the process by which the Corporation produces,
selects, modifies and administers unique murine MAbs that can selectively bind
to TAAs that are highly associated with certain types of cancers. The
Corporation has found that the selective binding of MAbs to TAAs can induce a
number of specific anti-tumor immune responses in a cancer patient.

       The Corporation believes that it has developed a method to isolate groups
of TAAs associated with specific cancers. The Corporation develops murine MAbs
having a high degree of specificity to a particular TAA. The Corporation has
shown that the MAb B43, the primary component of OvaRex(TM) MAb, has a high
degree of specificity to the TAA CA 125, an antigen over-expressed by the
majority of ovarian cancer patients. The Corporation has developed murine MAbs
that have specificity for TAAs associated with seven of the ten most lethal
forms of cancer in the United States.

       The Corporation believes that its AIT(R) approach to immunotherapy may
provide the following advantages over conventional approaches to immunotherapy:

         -        The AIT(R) immunotherapeutic induction approach uses a foreign
                  (murine) antibody to a single epitope of a multi-epitopic TAA
                  that induces the immune system to mount its own generalized
                  anti-tumor response to multiple epitopes of the TAA. The
                  technology mobilizes an immune response that is not restricted
                  by selection of idiotype or vaccine fragment;

         -        The AIT(R) immunotherapeutic approach has demonstrated the
                  stimulation of both a humoral and cellular immune response;

         -        The AIT(R) immunotherapeutic approach utilizes low dose and
                  intravenous infusion of antibody, minimizing the risk of
                  toxicity and lowering the cost of the product and the
                  treatment; and

         -        The use of a murine MAb induces a potent immune response that
                  would not be seen with humanized antibodies.

       The AIT(R) Technology is the subject of several patent applications filed
by the Corporation with the United States and other patent agencies around the
world. See "- Proprietary Protection". The Corporation's lead product,
OvaRex(TM) MAb, is based on a murine MAb that was licensed to the Corporation
from Biomira. See "- The Corporation's Products - OvaRex(TM) MAb", -"Strategic
Alliances and License Agreements - Biomira License Agreement" and "Legal
Proceedings". AltaRex may license or develop (as it has for BrevaRex(TM),
GivaRex(TM), and ProstaRex(TM) MAbs) other MAbs for future AIT(R) products.


                                       13
<PAGE>   17
         The Corporation has not completed the clinical trials necessary to
confirm the efficacy of its AIT(R) Technology. As a result, while the
preliminary results from other trials on its OvaRex(TM) MAb product are
encouraging, there can be no assurance that the Corporation's products will
demonstrate sufficient therapeutic benefit in the treatment of cancer patients
that would lead to obtaining regulatory approval. See "Risk Factors -
Uncertainty Associated with Preclinical and Clinical Testing".

       MECHANISM OF ACTION OF THE AIT(R) TECHNOLOgy

       The mechanism of action of the Corporation's AIT(R) Technology is based
on what the Corporation believes is the ability of the human immune system to
generate a tumor specific immune response to MAbs associated with specific TAAs.
The Corporation believes that certain murine MAbs may, upon administration to a
cancer patient, induce both a humoral and a cellular response by the patient's
immune system.

       There are four basic steps in the AIT(R) Technology process:

       Step 1 - Identification of the Tumor Associated Antigen

       AltaRex has isolated specific antigens that have a high association with
particular cancers. To date, TAAs have been identified and isolated for ovarian,
breast, prostate, lung, pancreatic, colorectal and stomach cancers.

       Step 2 - Development of the Monoclonal Antibody (Ab1)

       AltaRex uses the identified antigens to develop a murine MAb known as
Ab1. This MAb is used to elicit an immune response.

       Step 3 - Modification of Ab1 Monoclonal Antibody

       Using the Corporation's proprietary technology, antibodies from step two
are modified to increase the degree to which the antibody is capable of
eliciting an immune response. This process results in a modified murine MAb
(Ab1) that is ready for use.

       Step 4 - Initiation of the AIT(R) Induced Response

       The Corporation believes that administration of the modified murine MAb
into the patient initiates a cascade characterized by at least three major
events. The uniqueness of the AIT(R) Technology may be attributed, in part, to
these three different mechanisms by which the antibody may exert its influence
on tumor cells. These mechanisms have been elucidated by the Corporation's
detailed analysis of the anti-idiotype network or cascade. In the first
instance, the Ab1 antibody induces the production of an anti-idiotype network or
cascade of antibodies. Second, the immunogenicity of the antibody leads to a
cellular immune response. Finally, and most importantly, administration of the
antibody results in the formation of a TAA antibody complex in the blood, and a
novel presentation of the TAA to the immune system inducing a multi-epitopic
response to the TAA. The result of this cascade of events is a tumor specific
humoral and cellular response capable of killing cancer cells.


                                       14
<PAGE>   18
THE CORPORATION'S PRODUCTS

         AltaRex has selected four tumor associated antigens for its initial
therapeutic product development. The first and most advanced of these product
candidates is OvaRex(TM) MAb (MAb B43.13) for the treatment of patients with
tumors expressing CA 125. Other products in development include BrevaRex(TM) MAb
(for tumors expressing MUC1), ProstaRex(TM) MAb (for tumors expressing PSA) and
GivaRex(TM) MAb (for tumors expressing CA 19.9). The following chart sets forth
the current development status of the Corporation's products.

                                [GRAPHIC OMITTED]


         OVAREX(TM) MAB

         Overview

         In the United States, Canada and Europe, ovarian cancer causes more
deaths than any other cancer of the female reproductive tract. It is estimated
that in the United States more than 25,400 new cases of ovarian cancer will be
diagnosed and more than 14,000 women will die from this disease annually
(American Cancer Society, 1998 Cancer Facts & Figures).

         Although detection of ovarian cancer at an early stage is now
associated with an improved chance for curative treatment, survival figures have
not changed significantly over the past 15 years. This is partially due to a
lack of efficient diagnostic methods or markers for routine tests that could
increase the number of patients diagnosed at the early stage of their disease.
Consequently, in approximately three-quarters of diagnosed patients, the tumor
has already progressed to an advanced stage (Stage III or IV), making treatment
more difficult. Of these Stage III and IV patients, more than 80% express the
tumor associated antigen CA 125. Patients diagnosed with advanced ovarian cancer
usually demonstrate a survival time of less than two years (Hoskins et al.,
Journal of Clinical Oncology, October 1992).

         Prior to 1995, a research program for OvaRex(TM) MAb was initiated at
Biomira Research. In November 1995, the Corporation acquired from Biomira
certain assets and licensed certain technologies, including the antibody B43,
which is utilized in OvaRex(TM) MAb. Under the terms of a license agreement with
Biomira, the Corporation has a license to, among other things, use the antibody
B43 in connection with the development of anti-idiotype induction therapy
products and


                                       15
<PAGE>   19
applications. See "- Strategic Alliances and License Agreements - Biomira
License Agreement" and "Legal Proceedings".

         OvaRex(TM) MAb uses a murine MAb having a high degree of specificity to
a TAA (CA 125) over-expressed by the majority of ovarian cancer patients. The
Corporation believes that the product acts as an immunotherapeutic agent by
inducing or amplifying the human body's immune response against ovarian cancer.
This response is characterized by a cascade of events involving the production
of specific antibodies and cytotoxic T-cells in the body which target the tumor
cells. The Corporation believes that this combination of a humoral and cellular
immune response accounts for the observed improvement in the clinical outcome of
patients receiving the OvaRex(TM) MAb. See "- Clinical Experience with
OvaRex(TM) MAb".

         OvaRex(TM) MAb Regulatory Approval Strategy

         AltaRex has received Orphan Drug status from the FDA for OvaRex(TM) MAb
for the treatment of ovarian cancer which may result in seven years of market
exclusivity provided that the Corporation continues to meet certain conditions
established by the FDA. See "- Regulatory Approval Process Orphan Drug Status".

         Generally, the FDA approves the marketing of a drug based on adequate
and well-controlled trials. The FDA also has regulations which are intended to
expedite the development, evaluation and marketing of a new drug used for the
treatment of serious diseases for which there is no other satisfactory
treatment. In appropriate circumstances, the FDA may, in its discretion, approve
the marketing of a drug based on one adequate and well-controlled trial, if
supported by information from other related adequate and well-controlled studies
or if the trial is a single multi-centre trial. Fast Track designation makes a
product eligible for consideration for a number of programs, including meeting
with the FDA to discuss research protocol design and the possibility that the
marketing of the product may be approved immediately after the conclusion of
Phase II studies. As a result of FDAMA, obtaining Fast Track designation from
the FDA can result in approval based on a surrogate endpoint that is reasonably
likely to predict clinical benefit. Such approval may be subject to the
requirements that the sponsor conduct appropriate post approval studies and
submit all promotional materials related to the Fast Track product at several
different points in time.

         The Corporation has received a letter from the FDA dated December 17,
1998 stating that its Request for Fast Track designation has been reviewed and,
subject to the Corporation continuing to meet certain criteria, the FDA has
designated OvaRex(TM) MAb as a Fast Track Development program (for the effect of
OvaRex(TM) MAb in delaying time to recurrence in patients with Stage III or IV
ovarian cancer who have undergone standard treatment, surgery and chemotherapy,
and have minimal or no evidence of disease).

         As part of the Corporation's regulatory approval strategy, it is
conducting two potentially pivotal Phase IIb trials based on the surrogate
endpoint of time to disease relapse. The Corporation has also initiated open
Phase II trials that are underway in the United States and Canada with ovarian
cancer patient populations that have already experienced disease relapse. The
Corporation intends to treat 300-500 patients with OvaRex(TM) MAb (or an earlier
radiolabelled imaging product) prior to submission for approval by the FDA and
other regulatory agencies. The Corporation is also working with Lonza Biologics
to scale-up cell culture-based OvaRex(TM) MAb antibody that is expected to be
studied in comparability trials with the Corporation's current ascites-derived
antibody material. Scaling-up production of cell culture-derived materials will
enable the Corporation to further pursue


                                       16
<PAGE>   20
regulatory approval and commercialization of OvaRex(TM) MAb. See "Risk Factors -
Reliance Upon Strategic Relationships".

         Clinical Experience with OvaRex(TM) MAb

         An earlier formulation of OvaRex(TM) MAb was administered to more than
200 patients for imaging purposes. Of the patients that received the imaging
antibody, about 50% were evaluated for an immunological response to OvaRex(TM)
MAb. The principal investigators observed that following the administration of
the imaging antibody, particularly in those patients who received more than one
dose, the patients developed a clinical response to treatment characterized by
what appeared to be unusually long survival times.

         A subsequent retrospective statistical analysis, initially prepared by
an independent statistician at the University of Dortmund in Germany, identified
a statistically significant treatment effect in the survival time of patients
receiving the earlier OvaRex(TM) MAb, when compared to a historical control
group treated with conventional chemotherapy. An additional independent analysis
by a statistician at the University of Western Ontario in Canada was undertaken
with almost identical results. The following graph illustrates the adjusted
survival curves. In this Cox Statistical Analysis, the median length of survival
was 30 months for the group treated with conventional chemotherapy and 59 months
for the group that received the earlier formulation of OvaRex(TM) MAb.
Additionally, the five year survival rates as determined by this analysis were
11.4% for the chemotherapy group and 40.7% for the group that received the
earlier formulation of OvaRex(TM) MAb.

         Cox Statistical Analysis is a statistical method of comparing two
different populations with respect to the length of survival of patients who
received a drug with those who did not, while balancing the effect of other
parameters that can also affect survival.


           ADJUSTED OVERALL SURVIVAL CURVES OF OVARIAN CANCER PATIENTS
                   TREATED WITH MAB B43 AND WITH CHEMOTHERAPY


                                       17
<PAGE>   21
         Current Trials with OvaRex(TM) MAB

         Based on the encouraging results obtained in the early retrospective
analysis and a substantial body of evidence supporting the retrospective
analysis based on immunological laboratory research, the Corporation has
initiated a prospective multi-centre Phase IIb North American clinical trial
with ovarian cancer patients to definitively evaluate the clinical utility of
OvaRex(TM) MAb. In Canada, the Corporation received approval from the HPB on
October 1, 1996 to conduct the Phase IIb clinical trial. Patient enrollment
commenced in a number of major cancer centres in Canada in early 1997. In the
United States, the Corporation received Orphan Drug status for the OvaRex(TM)
MAb drug on November 26, 1996 and received approval from the FDA on May 23, 1997
to proceed with the Phase IIb trial. The first patient was treated in April
1998. In 1998, the FDA approved the combination of the Canadian and United
States clinical trials into one combined, placebo controlled, and potentially
pivotal, trial that will recruit 280 patients of which 235 patients have been
enrolled to date. This trial is expected to be completed with respect to the
primary endpoint in 2001.

         The Corporation has also initiated a second potentially pivotal Phase
IIb trial in the United States with an ovarian cancer patient population with
more advanced disease. In November 1998, the Corporation passed the 30 day FDA
Investigational New Drug Amendment waiting period and in December 1998 began
recruiting centres for this 102 patient, randomized, controlled and multi-centre
clinical trial. To date, 12 patients have been enrolled in centres in the United
States in this clinical trial. This trial is currently scheduled for completion
in 2001.


                                       18
<PAGE>   22
         The Corporation is also conducting additional open Phase II trials in
relapsed ovarian cancer patients in Canada and the U.S. The open Phase II trial
under way in Vancouver is fully enrolled with 14 patients.

         BREVAREX(TM) MAb

         The Corporation is developing a cancer immunotherapeutic based on the
AIT(R) Technology for the treatment of MUC1 expressing cancers including
multiple myeloma, lung and prostate cancer. This tumor marker, also known as
CA15.3, is mutated in 100% of individuals with multiple myeloma (Treon et. al.,
Blood, 1999).

         Multiple myeloma is a rarely curable disease that was previously
considered to be a bone cancer. It is actually a haematological malignancy
related to leukemias and lymphomas. It accounts for about 10% of all hematologic
cancers. It was estimated that approximately 14,000 new cases would be diagnosed
in the United States in 1998 with a total of about 11,300 deaths. (American
Cancer Society, 1998 Cancer Facts & Figures). A steady increase in incidence of
the disease has been noted over the past 30 years. Although multiple myeloma is
sensitive to chemotherapy, with a median survival of three to four years, most
patients are not cured and eventually succumb to their disease.

         Multiple myeloma cells express tumor associated antigens that are ideal
targets for immunotherapy. One such antigen is the core protein of MUC1. The
ability of an antibody to bind to MUC1 is largely dependent on the extent of
"mutation" of the antigen. In contrast to breast and certain other more common
cancers, MUC1 in multiple myeloma patients is highly mutated in virtually every
patient, thereby making antibody therapy targeting the core peptide more
accessible.

         The combination of MUC1 antigen target and the nature of the disease in
question (i.e. a discrete population for whom there is currently no curative
alternative) makes multiple myeloma ideally suited for AltaRex's development
strategy. The Corporation will apply for Orphan Drug status for BrevaRex(TM) MAb
and should be in a position to petition for Fast Track designation using time to
disease progression as a surrogate end point.

         The Corporation filed an Investigational New Drug Application or IND in
late October 1998 to initiate a BrevaRex(TM) MAb Phase I clinical trial. In this
trial, the Corporation intends to monitor safety and surrogate markers of
immunological effect. To date, the Corporation has enrolled 4 of the intended 15
patients in this trial. The Corporation also intends to initiate a
safety/efficacy trial in multiple myeloma patients in the first half of 2000.

         OTHER AIT(R) TECHNOLOGY INDICATIONS AND PRODUCts

         In addition to ovarian cancer and multiple myeloma, OvaRex(TM) MAb and
BrevaRex(TM) MAb may have applicability to other tumors expressing the target
antigens. In the case of OvaRex(TM) MAb, this would include endometrial, breast
and non-small cell lung cancer and in respect of BrevaRex(TM) MAb would include
breast, prostate and non-small cell lung cancer. The Corporation believes that a
strategic partner may wish to pursue these other potentially more lucrative, but
difficult to study, disease targets. The Corporation has commenced further
exploratory research and early preclinical work on two additional antibodies
specific to the tumor associated antigens PSA and CA19.9 for two other potential
products, ProstaRex(TM) MAb and GivaRex(TM) MAb, respectively.

         A component of the Corporation's strategy is to continue to engage in
research activities and to develop new technologies for antibody-based
immunotherapeutics to treat diseases in addition to


                                       19
<PAGE>   23
cancer. The Corporation has early work under way in autoimmune diseases and
infectious diseases and the Corporation also believes its AIT(R) approach could
be applicable to other diseases.

REGULATORY APPROVAL PROCESS

         REGULATORY REQUIREMENTS

         Regulations imposed by governmental authorities in Canada and the
United States, as well as their counterparts in other countries, are a
significant factor in the conduct of the research, development, manufacturing
and eventual marketing activities for the Corporation's proposed products. In
Canada, these activities are regulated by the Food and Drug Act (Canada) and the
rules and regulations promulgated thereunder, which are enforced by the
Therapeutic Products Programme of the Health Protection Branch of Health Canada.
Drugs and biological products are subject to rigorous regulation by the FDA in
the United States and by the European Medicines Evaluation Agency or EMEA in
Europe. The regulatory processes in Canada, the United States and Europe follow
similar essential steps although timing and results may be different.

         The regulatory process for the development and approval of a new drug
includes the conduct of pre-clinical and clinical trials. The duration of those
trials and number of subjects required to meet the requirements of the various
authorities may vary according to, among other things, the disease studied, the
seriousness of the side effects, whether there is any current or conventional
therapy, the size of the target population, and the nature of the proposed
treatment.

         PRE-CLINICAL EVALUATION

         The purpose of pre-clinical evaluation is essentially to determine the
safety, pharmacokinetics and efficacy of a new drug in animals before it is
administered to humans. The data collected during pre-clinical studies must be
presented in the form of an IND application to the regulatory authorities in the
country where clinical trials will be conducted. In the United States, unless
otherwise notified, clinical trials may begin 30 days after the IND application
is filed, whereas in Canada, clinical trials may not begin until 60 days after
the application is submitted and upon receipt of a "no objection" letter.

         CLINICAL TRIALS

         Phase I Clinical Trials

         Phase I clinical trials are commonly performed in healthy human
subjects or, more rarely, in selected patients with the targeted disease or
disorder. The objective of these trials is to study the pharmacokinetics and
pharmacodynamics of the drug, as well as the toxicity of the treatment and the
patient's tolerance to it. Data regarding the absorption, distribution,
metabolism and excretion of the drug is also compiled in Phase I clinical
trials.


                                       20
<PAGE>   24
         Phase II Clinical Trials

         In Phase II clinical trials, preliminary evidence is sought regarding
the pharmacological effects of the drug and the desired therapeutic efficacy
with a small number of patients with the targeted disease. At this stage,
efforts are made to evaluate the effects of various dosages and to establish an
optimal dosage level and dosage schedule. Additional safety data may also be
compiled from these trials.

         Phase IIb (sometimes called Phase II/III) trials can be undertaken for
serious or fatal diseases and consist of well-controlled trials to evaluate
efficacy (and safety) in patients with the disease or condition to be treated,
diagnosed or prevented which may be deemed to be pivotol. Phase IIb trials can
lead to expedited review and accelerated approval by the FDA of the product for
commercial sale conditional upon the completion of subsequent Phase III
post-market information studies. Phase IIb trials incorporate certain design and
control features of Phase III trials. If data collected from Phase IIb trials is
statistically significant, authorization for accelerated approval may be sought
from the FDA.

         Phase III Clinical Trials

         The Phase III clinical development program generally consists of
expanded, large-scale studies of patients with the targeted disease or disorder
so as to obtain definitive statistical evidence of the efficacy and safety of
the proposed product and dosing regimen in comparison with standard therapy.

         After an appropriate analysis, the HPB, FDA or EMEA may interrupt
clinical trials at any stage if the drug has a clear efficacy advantage or,
alternatively, if the health of the subjects is threatened or the side effects
are not compensated for by the drug's benefits.

         REGULATORY APPROVAL

         Once Phase III clinical trials have been completed, the applicant will
compile all results, as well as all information concerning the product and its
composition, synthesis, manufacture, packaging and labelling methods, for the
purpose of obtaining approval to market the product. This application is known
as a New Drug Application or NDA or either a Biologics License Application or
BLA for a well-characterized biologic, such as a monoclonal antibody, or a
combination of a Product License Application or PLA and an Establishment License
Application or ELA for all other biologicals in the United States and as a New
Drug Submission or NDS in Canada. Government authorities may require that
additional trials be performed after the product is marketed to assess its
long-term effects.

         Since drug manufacturing is also regulated, the applicant is required
to ensure that it complies with cGMP's, which are quality standards that require
the control of production activities, raw-material procurement, complaint
management, product recalls, labelling and promotional material. In addition to
these standards, which are common to all drugs, certain biologics are subject to
ELA's and lot by lot release agreed to by FDA to ensure batch to batch
comparability.

         In certain circumstances, the FDA may expedite the development,
evaluation and marketing of new drugs used for the treatment of serious diseases
for which there is no other satisfactory treatment by granting such programs a
Fast Track designation. See "- The Corporation's Products - OvaRex(TM) MAb".


                                       21
<PAGE>   25
         ORPHAN DRUG STATUS

         Orphan Drug designation is designed to facilitate the introduction of
drugs into the market in the United States for use in treating rare diseases or
conditions. The disease must affect fewer than 200,000 patients in the United
States. Upon obtaining marketing approval for the drug, the FDA will grant a
period of seven years during which no approval will be given to a subsequent
sponsor of the same drug product for the same indication. The only exception to
this is if a competitor can show superiority of a second product which generally
requires a head to head comparison. Written application for Orphan Drug status
must be submitted to the Office of Orphan Drug Products Development of the FDA
and must include documentation supporting the request for the particular
indication. Orphan Drug designation also allows the manufacturer to apply for
grants from the United States government to help defray the cost of the clinical
testing of the drug in the United States and may allow for faster review of
pending United States patent applications filed with the United States Patent
and Trademark Office.

         AltaRex has received Orphan Drug status for OvaRex(TM) MAb for ovarian
cancer and expects to file similar applications for its other antibodies. See "-
The Corporation's Products - OvaRex(TM) MAb-OvaRex(TM) MAb Regulatory Approval
Strategy".

STRATEGIC ALLIANCES AND LICENSE AGREEMENTS

         As part of its business strategy the Corporation plans to license the
products it develops to strategic partners. These partners would participate in
the later stage clinical development as required by the FDA, HPB, EMEA and other
international drug regulatory agencies. The partners would then have the
opportunity to market the Corporation's products in return for payment to the
Corporation of up-front licensing fees, milestone payments and royalties. The
major objectives in seeking to license products to strategic partners include:

         -        Minimizing development expenditures through cost sharing
                  programs;

         -        Arranging for access to the resources and experience of large
                  multinational pharmaceutical corporations; and

         -        Maximizing long term revenue streams from royalties on the
                  sale of the Corporation's products.

         The Corporation has no current plans for developing in-house
manufacturing (beyond the pilot phase), marketing or sales capabilities. The
Corporation believes that the biopharmaceutical industry has adequate
manufacturing, marketing and sales capacity, which the Corporation believes it
may access through contractual or partnership arrangements.

         The Corporation's current alliances and collaborative partnerships are
described below.

         DRAXIMAGE INC.

         The Corporation is a party to an alliance agreement with Frosst
Radiopharmaceuticals (a division of Merck Frosst Canada Inc.) dated February 20,
1996 and assigned to Draximage Inc. ("Draximage"), a wholly-owned subsidiary of
Draxis Health Inc. ("Draxis Health"), by agreement dated August 1, 1997 (the
"Draxis Alliance Agreement"). Under the Draxis Alliance Agreement, the
Corporation and Draximage have agreed to collaborate on the manufacture of pilot
and scale-up


                                       22
<PAGE>   26
batches of OvaRex(TM) MAb. Draximage has agreed to manufacture (fill/finish)
vials of OvaRex(TM) MAb for clinical trials at a fixed price per vial and may
have certain contingent rights with respect to the manufacture and/or marketing
of the OvaRex(TM) MAb drug for commercial purposes. There are various conditions
to be fulfilled by the parties before such manufacturing and/or marketing can
commence.

         UNIVERSITY OF ALBERTA & NOUJAIM INSTITUTE

         In 1998, the Corporation entered into a three year collaborative
research agreement (the "NI Research Agreement") with the University of Alberta
and its Noujaim Institute for Pharmaceutical Oncology Research (the "Noujaim
Institute"). Under the NI Research Agreement the Noujaim Institute performs
research on behalf of and at the direction of the Corporation in the development
of tumor binding agents and therapeutic compositions. During the term of the NI
Research Agreement the Corporation compensates the University for services
rendered in an amount not to exceed $300,000 per year. The Corporation will also
owe to the University a royalty of one percent on any net sales (as defined in
the NI Research Agreement) derived from a prostate cancer immunotherapeutic
composition developed under the NI Research Agreement.

         ALBERTA HERITAGE FOUNDATION AGREEMENT

         The Alberta Heritage Foundation for Medical Research ("AHFMR") is a
foundation established by the Government of the Province of Alberta to support
medical research in the Province of Alberta.AHFMR contributed $500,000 to the
funding of the current Canadian Phase IIb trial of OvaRex(TM) MAb pursuant to an
agreement dated March 1, 1997 (the "AHFMR Agreement"). Commencing upon 12 months
following the earlier of the regulatory approval of OvaRex(TM) MAb and March 1,
2001 the Corporation shall pay to AHFMR on an annual basis an amount equal to
the lesser of 5% of the gross product sales (as defined in the AHFMR Agreement)
received from commercialization of OvaRex(TM) MAb and $100,000. Total payments
by the Corporation under the AHFMR Agreement shall not exceed $1 million. In
addition, in connection with the AHFMR Agreement the Corporation granted to
AHFMR warrants to purchase 41,667 Common Shares at an exercise price of $12.00
per share which expire on March 1, 2000.

         BIOMIRA LICENSE AGREEMENT

         The Corporation holds an exclusive worldwide license from Biomira for
the use of the murine working hybridoma cell bank and murine antibody MAb B43
(the "B43 Technology") for all anti-idiotype induction applications and
products, as well as for the use of such related experimental and clinical data
for anti-idiotype induction applications and products until November 30, 2010.
MAb B43 is the functional component of the OvaRex(TM) MAb product.

         The Corporation obtained the license from Biomira pursuant to a license
agreement dated November 24, 1995 (the "Biomira License Agreement"). Under the
terms of the Biomira License Agreement:

         -        The Corporation paid an up-front fee of $150,000;

         -        The Corporation agreed to use its best efforts to
                  commercialize the B43 Technology;

         -        The Corporation agreed to spend a minimum of $3,000,000 to
                  develop the B43 Technology from December 1, 1995 to December
                  1, 1999; and


                                       23
<PAGE>   27
         -        The Corporation agreed to pay a royalty to Biomira on the sale
                  of any products developed using the B43 Technology at various
                  rates as set out in the Biomira License Agreement for a period
                  of ten years from December 1, 1995 to November 30, 2005.

         The Biomira License Agreement only pertains to the products that will
potentially use MAb B43 or a derivative thereof. Products developed by the
Corporation which do not incorporate the B43 Technology are not subject to the
Biomira License Agreement.

         Under certain funding arrangements (the "ISTC Funding Arrangements")
between Biomira and the Minister of Industry, Science and Technology Canada
("ISTC"), Biomira is required to obtain the consent of ISTC to any license
relating to technology developed pursuant to the ISTC Funding Arrangements,
including the B43 Technology. The Corporation understands that Biomira has
failed to obtain such consent with respect to the license of the B43 Technology
granted to the Corporation under the Biomira License Agreement. In the past, the
Corporation has had discussions with ISTC and Biomira in this regard. In the
event of a breach of a term or condition of the ISTC Funding Arrangements, ISTC
may direct Biomira to transfer to ISTC clear title to, among other things, the
B43 Technology. In such event, the Corporation may need to obtain a license from
ISTC to use the B43 Technology which may affect the Corporation's rights granted
under the Biomira License Agreement. To the knowledge of the Corporation, ISTC
has not, to date, taken any such action. See "Risk Factors - Reliance on
Strategic Relationships" and "Risk Factors - Proprietary Rights and Patent
Protection".

         Biomira has given the Corporation written notice alleging that the
Corporation is in default of certain reporting obligations under the Biomira
License Agreement and that Biomira will terminate such agreement on June 1, 1999
unless such alleged defaults are fully cured on or before such date. Biomira had
previously given notice to the Corporation on March 16, 1999 of the alleged
default and that such agreement would terminate on April 15, 1999. The
Corporation believes that it has taken all such actions to ensure that it is
currently in compliance with all of the terms of the Biomira License Agreement
and intends to take all such actions as may be necessary to prevent any attempt
by Biomira to terminate the Biomira License Agreement.

         Biomira and the Corporation are currently engaged in respective legal
actions against each other, including an action by the Corporation relating to
the Biomira License Agreement. See "Legal Proceedings".

         CANADA-ISRAEL INDUSTRIAL RESEARCH AND DEVELOPMENT FOUNDATION

         The Corporation is a party to a co-operation and project funding
agreement with each of the Canada-Israel Industrial Research and Development
Foundation and Orgenics Ltd. (the "Canada-Israel Agreement") dated February 3,
1997. A total of $300,000 in funding is available to the Corporation under the
Canada-Israel Agreement over the three year term. The Corporation has received
$100,000 in funding to date under the Canada-Israel Agreement, all in 1997. The
Corporation is not currently conducting research pursuant to the contract. The
funds are re-payable pursuant to a royalty based upon gross sales (as defined in
the Canada-Israel Agreement) of products relating to research conducted
thereunder. The research conducted under the Canada-Israel Agreement does not
relate to the Corporation's AIT(R) Technology-related products.


                                       24
<PAGE>   28
MANUFACTURING

         The Corporation does not currently manufacture any of its products and
it has no immediate plans to establish manufacturing facilities for commercial
production of its therapeutic products. Instead, the Corporation's strategy,
beyond the pilot phase, is to manufacture and commercialize its products through
strategic alliances and licensing agreements with major pharmaceutical
companies.

HUMAN RESOURCES

         As at March 31, 1999, the Corporation had 35 employees, 20 of whom were
located at the Corporation's locations in Edmonton, Alberta and 15 of whom were
located at the Corporation's executive office in Waltham, Massachusetts. There
were 20 employees working in research and development and 15 working in
administration and corporate affairs. Four of the research and development
employees hold Ph.D.s and two are M.D.s.

         None of the employees are governed by a collective bargaining
agreement. The Corporation believes that working relationships with its
employees are excellent.

LEASED PROPERTIES

         AltaRex's Canadian office is located at Campus Tower, Suite 300, 8625 -
112 Street, Edmonton, Alberta, Canada T6G 1K8. Its research and development
facility is located at 1134 Dentistry Pharmacy Building, University of Alberta,
Edmonton, Alberta T6G 2N8. The Corporation's U.S. office is located at Suite
125, 303 Wyman Street, Waltham, Massachusetts 02451. All of the above premises
are leased by AltaRex.

         The Canadian leases are each for a term of five years, each terminating
on December 31, 2001 and the U.S. lease is for a three-year term, terminating on
March 31, 2001. The total lease costs under such leases for the Corporation were
approximately $280,000 for the fiscal year ended December 31, 1998 and are
expected to be approximately $280,000 for the fiscal years ending December 31,
1999 and 2000.

         In January 1999, the Corporation entered into a letter of intent for
the lease of approximately 25,000 square feet of laboratory and office
facilities in Waltham, Massachusetts. The facilities are expected to be
available on or about December 1, 1999. If leased as proposed, the initial term
would extend until March 31, 2007 and the expected annual lease cost to the
Corporation would be approximately $1.3 million plus operating expenses.

COMPETITION

         The biopharmaceutical industry is intensely competitive. Many
companies, including other biopharmaceutical companies and biotechnology
companies, are actively engaged in activities similar to those of the
Corporation, including research and development of drugs for the treatment of
cancer. More specifically, competitors for the development of new therapeutic
products to treat cancer focus on MAb based cancer therapeutics, cancer vaccines
and other approaches that are based on either stimulation of the body's own
immune response or on MAbs. Many of these companies have substantially greater
financial and other resources, larger research and development capabilities and
more extensive marketing and manufacturing organizations than the Corporation.
In addition, some such companies have considerable experience in pre-clinical
testing, clinical trials and other regulatory approval procedures. There are
also academic institutions, governmental agencies and other research


                                       25
<PAGE>   29
organizations which are conducting research in areas in which the Corporation is
working; they may also market commercial products, either on their own or
through collaborative efforts.

         The Corporation expects to encounter significant competition for the
pharmaceutical products it plans to develop. Companies that complete clinical
trials, obtain required regulatory approvals and commence commercial sales of
their products before their competitors may achieve a significant competitive
advantage. In addition, certain pharmaceutical and biotechnology firms,
including major pharmaceutical companies and specialized structure-based drug
design companies, have announced efforts in the field of immunological therapy
that exploit the presence of TAAs, and the Corporation is aware that other
companies or institutions are pursuing development of new drugs and technologies
directly targeted at applications for which the Corporation is developing its
biopharmaceutical products.

         Based on its review of the industry, the Corporation is not aware of
any other company that is focusing on anti-idiotype induction therapy as
practiced by the Corporation. There are a number of companies however, that
focus on the broader use of antibodies to treat various diseases. These
companies include Centocor Inc., Coulter Pharmaceuticals Inc., Genentech, IDEC,
Medarex Inc. and Immunex Corp, among others. The Corporation expects that its
platform AIT(R) Technology will attract significant additional competitors over
time. In order to compete successfully, the Corporation's goal is to develop
proprietary positions in patented drugs for therapeutic markets which have not
been satisfactorily addressed by conventional research strategies and, in the
process, extend its expertise in biopharmaceutical products design. See "Risk
Factors - Competition".

PROPRIETARY PROTECTION

         The Corporation vigorously pursues a policy of seeking patent
protection to preserve its proprietary technology and its right to capitalize on
the results of its research and development activities and, to the extent it may
be necessary or advisable, to exclude others from appropriating its proprietary
technology. The Corporation also relies upon trade secrets, know-how, continuing
technological innovations and licensing opportunities to develop and maintain
its competitive position. The Corporation plans to prosecute and defend its
intellectual property, including any patents that may issue, and proprietary
technology. The Corporation regularly searches for third-party patents in its
fields of endeavour, both to shape its own patent strategy as effectively as
possible and to identify licensing opportunities.

         PATENTS

         In general, the Corporation pursues a policy of obtaining patent
protection both in the United States and in selected foreign countries for
subject matter considered patentable and important to its business. In addition,
a portion of the Corporation's proprietary position is based upon technology and
products the Corporation has licensed from others, including MAb B43 that binds
to an ovarian cancer antigen. This license agreement generally requires the
Corporation to pay royalties upon commercialization of products covered by the
licensed technology.

         The Corporation owns five pending United States patent applications for
its therapeutic products and processes. Worldwide, the Corporation owns three
pending international applications and 15 pending national applications covering
the same technology. These patent applications cover various aspects of the
Corporation's core technology, products, processes, and the methods for their
production and use. These patent applications include both broad and specific
claims to various tumor therapies. The Corporation will continue to aggressively
protect its technology with new patent filings with the intent of further
extending its patent coverage.


                                       26
<PAGE>   30
         Biomira has recently commenced a legal action against, among others,
the Corporation seeking, among other things, an order stating that Biomira is
the sole owner of an invention disclosed in a PCT application filed by the
Corporation in respect of, among other things, the Corporation's lead product
and an injunction prohibiting the Corporation from using the invention referred
to therein. See "Risk Factors-Biomira Litigation" and "Legal Proceedings".

         TRADEMARKS AND TRADE NAMES

         The Corporation also relies upon trademarks and tradenames to protect
its technology. The Corporation has a registered trademark for its AIT(R) mark
in the United States and Canada and owns a Canadian registration for the
trade-mark IRT(R) . As well, the Corporation has pending applications to
register trademarks in various countries for the AltaRex name as well as for the
brand names (OvaRex(TM), BrevaRex(TM), GivaRex(TM), and ProstaRex(TM) MAb)
relating to its developing products.

         TRADE SECRETS

         The Corporation also relies in part on trade secrets, unpatented
know-how and continuing technological advancements to maintain its competitive
position. It is the practice of the Corporation to enter into confidentiality
agreements with employees, consultants and corporate sponsors. There can be no
assurance, however, that these measures will prevent the unauthorized disclosure
or use of the Corporation's trade secrets and know-how.

CLINICAL ADVISORY BOARD

         The Corporation maintains a Clinical Advisory Board (the "Advisory
Board") composed of outside internationally recognized clinicians and
scientists. The Advisory Board meets periodically to review the operational
aspects of the Corporation's clinical program and make appropriate
recommendations with regard to the perceived trends and direction of other
companies. The members of the Advisory Board have no rights to the Corporation's
technology and each member has signed a confidentiality agreement with the
Corporation. Advisory Board members receive an honorarium of U.S.$15,000 per
year. The current composition of the Advisory Board is:



                                       27
<PAGE>   31
<TABLE>
<CAPTION>
NAME                                        INSTITUTION
- ----                                        -----------
<S>                                         <C>
Robert Ozols, M.D., Ph. D.................  Fox Chase Cancer Center, United States
Roger Cohen, M.D..........................  University of Virginia, United States
Richard Margolese, M.D....................  McGill University, Canada
Daniel Von Hoff, M.D......................  Cancer Therapy and Research Center, United States
James Holland, M.D........................  Mount Sinai School of Medicine, New York, United States
</TABLE>

         ROBERT OZOLS, M.D. AND PH.D is Senior Vice President for Medical
Science at Fox Chase Cancer Center, Philadelphia. Dr. Ozol serves as Chairman of
the Advisory Board and is also Medical Director at the Hospital of the Fox Chase
Cancer Center and Professor of Medicine at Temple University. He is currently
serving on the Oncologic Drugs Advisory Committee of the FDA. The recipient of
the 1990 Cancer Research Award from the Milken Medical Foundation, Dr. Ozols has
also been elected to the American Society for Clinical Investigation. Dr. Ozols
received his medical degree and a Ph.D. in Biochemistry at the University of
Rochester in New York.

         ROGER COHEN, M.D. is Associate Professor at the University of Virginia,
Department of Medicine, Division of Haematology-Oncology and Director of the
Clinical Trials Office. Dr. Cohen is also currently an advisor and consultant to
the FDA at the Center for Biologics Evaluation and Research. Dr. Cohen received
his medical degree at Harvard Medical School and is the recipient of several
awards including the FDA Special Recognition Award.

         RICHARD MARGOLESE, M.D. is a Professor in the Department of Oncology,
and Herbert Black Chair in Surgical Oncology, McGill University. Dr. Margolese
is also Associate Director of Research at Lady Davis Institute, past President
of the National Cancer Institute of Canada and past Co-Chairman of the
Management Committee of the Canadian Breast Cancer Research Initiative. Dr.
Margolese received his medical degree at McGill University and was awarded the
Order of Canada in 1997 - Canada's highest honour for lifetime achievement.

         DANIEL VON HOFF, M.D. is Director of the Institute for Drug Development
at the Cancer Therapy and Research Center in San Antonio, Texas. Dr. Von Hoff is
President-Elect of the American Association for Cancer Research and recipient of
the Richard and Hinda Rosenthal Award for clinical investigation. He is also a
Professor for the Department of Cellular and Structural Biology and a Clinical
Professor in the Division of Medical Oncology at The University of Texas Health
Science Center. Dr. Von Hoff received his medical degree from Columbia College
of Physicians and Surgeons in New York.

         JAMES HOLLAND, M.D. is Distinguished Professor of Neoplastic Diseases,
Department of Medicine, Mount Sinai School of Medicine, New York. Dr. Holland
holds both a Medical Doctorate degree from Columbia University and a Doctor of
Science degree from State University of New York. He is past-President of both
the American Society of Clinical Oncology and the American Association of Cancer
Research and has contributed to over 590 scientific publications.




                                       28
<PAGE>   32
                           CONSOLIDATED CAPITALIZATION

         The following table sets forth the consolidated capitalization of
AltaRex as at December 31, 1998, March 31, 1999, and as at March 31, 1999 after
giving effect to this offering. This table should be read in conjunction with
the consolidated financial statements and the notes thereto contained elsewhere
in this prospectus.

<TABLE>
<CAPTION>
                                                                                                     As at March 31, 1999
                                                       As at December 31,         As at March         after giving effect to
                                  Authorized                   1998                 31, 1999            this offering
                                  ----------                   ----                 --------            -------------

                                                                $                      $                      $

<S>                               <C>                 <C>                        <C>                 <C>
Common Shares...............      unlimited                      32,838,364           32,838,364              48,138,364
Accumulated deficit during
 the development stage......                                   (20,191,524)      (20,191,524)(1)             (20,191,524)(1)
                                                      ---------------------     ----------------     -------------------
Total capitalization........                                     12,646,840           12,646,840              27,946,840
                                                      =====================     ================     ===================

Number of Common Shares.....                                     16,512,613           16,512,613              50,512,613
                                                      =====================     ================     ===================
</TABLE>

Note:

(1)      This amount represents the accumulated deficit of the Corporation as at
         December 31, 1998.

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

INTRODUCTION

         The following discussion and analysis explains trends in the
Corporation's financial condition and results of operation for the years ending
December 31, 1998, 1997 and 1996. In each case, issues and risks that can be
reasonably expected to impact future operations are discussed. These issues and
risks may cause actual results to differ materially from those described in
forward-looking statements contained in this management's discussion and
analysis. Where used, the words "anticipate", "expect", "intend", "should", and
similar expressions are intended to identify forward-looking statements. This
management' s discussion and analysis should be read in conjunction with the
consolidated financial statements and the related notes included elsewhere in
this prospectus. Such consolidated financial statements have been prepared by
management in accordance with accounting principles generally accepted in Canada
which conform in all material respects to accounting principles in the United
States, except as described in Note 8 to the consolidated financial statements
contained elsewhere in this prospectus.




                                       29
<PAGE>   33
SELECTED FINANCIAL INFORMATION

         The selected financial information provided below has been taken from
the consolidated financial statements of the Corporation contained elsewhere in
this prospectus.

<TABLE>
<CAPTION>
                                        YEAR ENDED DECEMBER 31
                                  1998            1997           1996
                                  ----            ----           ----

                                  ($)              ($)            ($)
INCOME STATEMENT DATA
<S>                           <C>            <C>            <C>
Revenues ..................     1,013,742      1,619,836         88,257
Expenses
 Research and development .     9,433,681      4,733,918      1,720,031
 General and administrative     4,695,990      1,563,555        540,285
                              -----------    -----------    -----------
Net loss ..................   (13,115,929)    (4,677,637)    (2,172,059)
                              ===========    ===========    ===========
Net loss per common share .         (0.79)         (0.29)         (0.24)
                              ===========    ===========    ===========
</TABLE>

<TABLE>
<CAPTION>
                                                            AS AT DECEMBER 31
                                                        1998                       1997
                                                        ----                       ----

                                                         ($)                       ($)
BALANCE SHEET DATA
<S>                                                   <C>                        <C>
Total Assets.................................         15,159,774                 27,229,744
Shareholders' equity.........................         12,646,840                 25,708,769
</TABLE>


OVERVIEW

         The Corporation's business is the research, development and
commercialization of unique antibody-based immunotherapeutics for the treatment
of late-stage cancers. Substantially all of the Corporation's products are
subject to regulation by the HPB in Canada, the FDA in the United States, the
EMEA in Europe and similar agencies in other countries. None of the
Corporation's products have been approved to date. Because the Corporation is in
the development stage of its products, the Corporation has not been profitable
since its inception and expects to continue to incur substantial losses in
continuing the research, development and clinical trials of its products. The
Corporation does not expect to generate significant revenues until such time as
and unless its cancer therapeutic products are approved by the various
regulatory agencies and become commercially viable.

ACQUISITION AND AMALGAMATION

         Effective July 17, 1996, the Corporation (at that time known as Allrich
Energy Group Inc.) acquired all of the outstanding shares of AltaRex Inc. for a
purchase price satisfied through the issue of 7,525,000 Common Shares of the
Corporation. These Common Shares gave AltaRex Inc.'s shareholders a controlling
interest in the Corporation and effectively constituted a reverse take-over of
the Corporation by the shareholders of AltaRex Inc. The Corporation, at the time
of acquisition, was an inactive public company. The purpose of the acquisition
was to realize funds associated with a private placement and special warrant
offering that were completed at that time and to provide future access to public
market funding. Effective May 31, 1997, the Corporation amalgamated with AltaRex
Inc. and continued under the name of AltaRex Corp.



                                       30
<PAGE>   34
RESULTS OF OPERATIONS

         The Corporation, through its predecessor AltaRex Inc., commenced
operations on December 1, 1995 and completed its first full year of operations
on December 31, 1996. As of December 31, 1998, the Corporation had incurred
cumulative losses of $20.2 million. This related to losses of $13.1 million,
$4.7 million, and $2.2 million, respectively, for the years ended December 31,
1998, 1997 and 1996 and a loss of $0.2 million for the one month ended December
31, 1995. These increasing losses are due to the increased cost of clinical and
product development activities and supporting efforts in product
commercialization. Costs for research and development and supporting activities
are expected to increase as the Corporation pursues its development, clinical
trials and commercialization programs prior to receiving regulatory approvals
and the successful introduction of the Corporation's products.

YEAR ENDED DECEMBER 31, 1998 COMPARED TO YEAR ENDED DECEMBER 31, 1997

         REVENUES

         Revenues for the year ended December 31, 1998 decreased by $0.61
million, from $1.62 million in 1997 to $1.01 million in 1998. Interest income
increased by $0.06 million, from $0.90 million in 1997 to $0.96 million in 1998,
due to higher effective interest rates on short-term investments in 1998.
Research contract revenue decreased by $0.63 million, from $0.68 million to
$0.05 million in 1998, due to the completion of government research contracts in
late 1997 and early 1998.

         EXPENSES

         Expenses for the year ended December 31, 1998 increased by $7.83
million, from $6.30 million in 1997 to $14.13 million in 1998. Research and
development expenses increased by $4.70 million, from $4.73 million in 1997 to
$9.43 million in 1998. This increase is due to the expansion and progress of the
Corporation's clinical trial program for OvaRex(TM) MAb, which involved the
consolidation of the Corporation's Phase II clinical trial commenced in Canada
in 1997 with its United States Phase IIb clinical trial initiated in 1998 to
form a potentially pivotal Phase IIb North American trial. The increase is also
due to the costs related to production of antibody for clinical trial purposes.

         General and administrative expenses increased by $3.13 million, from
$1.56 million in 1997 to $4.69 million in 1998. This increase is due to the
addition of key management personnel in 1998, the establishment of an office in
the United States in May 1998 and the relocation of certain personnel to such
office, as well as the related support costs for increasing research and
development activities and patent and corporate development activities.

         The Corporation anticipates that the level of spending in research and
development will continue to increase significantly in the near future as the
Corporation's OvaRex(TM) MAb, BrevaRex(TM) MAb and other programs enter into
further research and development activities, including but not limited to cell
culture-derived material production, clinical trials and submissions for
regulatory approvals. This will also result in an increase in general and
administrative expenses to support the growth in the Corporation's research,
clinical and business development programs. The actual levels of research and
development and general and administrative expenditures are dependent on the
cash resources available to the Corporation and the extent to which the
Corporation is successful in contracting with strategic partners to finance and
commercialize its products. See " - Liquidity and Capital Resources".




                                       31
<PAGE>   35
YEAR ENDED DECEMBER 31, 1997 COMPARED TO YEAR ENDED DECEMBER 31, 1996

         REVENUES

         Revenues for the year ended December 31, 1997 increased by $1.53
million, from $0.09 million in 1996 to $1.62 million in 1997. Interest income
increased by $0.84 million, from $0.06 million in 1996 to $0.90 million in 1997,
due to higher average balances in short-term investments resulting from funds
raised in the $27.7 million public share offering completed in December 1996.
Research contract revenue increased by $0.67 million, from $0.01 million in 1996
to $0.68 million in 1997, and relates to two government research contracts
undertaken by the Corporation.

         EXPENSES

         Expenses for the year ended December 31, 1997 increased by $4.04
million, from $2.26 million in 1996 to $6.30 million in 1997. Research and
development expenses increased by $3.01 million, from $1.72 million in 1996 to
$4.73 million in 1997. This increase reflects the cost of supporting a higher
level of activity in research, product development and clinical trials,
including increased staffing and research supplies and the costs of managing
clinical trials. Clinical trial activity included the commencement of a Phase II
clinical trial of the Corporation's lead product OvaRex(TM( MAb in Canada, as
well as the preparation for a Phase IIb clinical trial in the United States.

         General and administrative expenses for the year ending December 31,
1997 increased by $1.02 million, from $0.54 million in 1996 to $1.56 million in
1997. This increase is due to the support required of the Corporation's growth
in its research and development programs, its business development activities
and the costs related to the maintenance of a publicly-traded company, including
increased staffing.

FOREIGN CURRENCY EXPOSURE

         To date, exposure to foreign currency fluctuations has not had a
material effect on the Corporation's operations. The Corporation does not
currently engage in hedging or other activities to control the risk of foreign
currency exposure, but will continue to monitor the situation and may do so in
the future as conditions warrant.

IMPACT OF THE YEAR 2000 ISSUE

         The Year 2000 issue is the result of computer programs being written
using two rather than four digits to define the applicable year. Computer
programs that have time sensitive software may recognize a date using "00" as
the year 1900 rather than the year 2000. This could result in a major system
failure or miscalculations, causing disruptions in operations.

         In 1998, the Corporation developed, and is in the process of
completing, a comprehensive plan for the assessment of the impact of, and the
necessary remediation plans related to, the Year 2000 issue. The Corporation's
plan includes the review, assessment and testing of internal systems and
equipment, the review of Year 2000 compliance and readiness of vendors and
suppliers to the Corporation and the development of contingency plans for all
mission critical systems and risks. The design and execution of the plan is the
responsibility of the Chief Financial Officer and involves personnel from
throughout the Corporation.



                                       32
<PAGE>   36
         The Corporation has completed its inventory of all equipment and
software applications it uses throughout its offices and labs and is in the
process of testing such equipment and software. The Corporation has identified
all key vendors and suppliers and is currently in communication with them
regarding Year 2000 readiness. Confirmation of Year 2000 compliance has been
obtained from the Corporation's payroll and accounting systems suppliers and
banking and investment management service providers. The Corporation is
continuing its review and assessment of Year 2000 readiness with contract
research organizations and other suppliers and service providers involved in the
Corporation's clinical development programs. Alternative suppliers and service
providers and appropriate back-up of data and information will be provided to
mitigate any potential losses or delays due to the Year 2000 issue. The
Corporation specifies the need for Year 2000 compliance in all significant new
contractual relationships.

         Management of the Corporation believes that the review, assessment and
testing and the completion of any necessary changes will be completed by
September, 1999. The Corporation's expected aggregate expenditures related to
the Year 2000 compliance is expected to be less than $100,000. These
expenditures will be incurred and paid in 1999 and the first half of 2000.

LIQUIDITY AND CAPITAL RESOURCES

         Cash and short-term investments totalled $12.8 million at December 31,
1998. Since its inception, the Corporation has financed its operations primarily
through private placements and public offerings of equity securities, amounting
to $32.9 million, and interest income on invested balances, amounting to $1.9
million. The Corporation currently has no contributing cash flows from
operations. As a result, the Corporation relies on external sources of financing
such as the issue of equity or debt securities, the exercise of warrants and
investment income.

         On March 2, 1999, the Corporation announced that it would not proceed
with a previously announced offering of rights to purchase up to 3,302,522
Common Shares at a price of $0.62 per share.

         The Corporation's net cash used in operating activities amounted to
$11.4 million, $4.0 million and $2.2 million for the years ended December 31,
1998, 1997 and 1996, respectively, and resulted primarily from the Corporation's
net operating losses. The Corporation's net cash used in investing activities
amounted to $0.6 million, $1.5 million and $0.1 million for the years ended
December 31, 1998, 1997 and 1996, respectively, and resulted primarily from the
purchase of capital assets used in the Corporation's business.

         The Corporation expects to incur substantial and increasing research
and development expenses, including expenses related to preclinical studies,
clinical trials, manufacturing and commercialization activities, and supporting
general and administrative expenses. The Corporation believes that the net
proceeds of this offering, together with its available cash, and interest earned
thereon, should be sufficient to finance its operations and capital needs
through the year 2000, while maintaining sufficient cash reserves. The
Corporation's funding needs may vary depending on a number of factors including
progress of the Corporation's research and development programs, the number and
breadth of these programs, the results of preclinical studies and clinical
trials, the cost, timing and outcome of the regulatory process, the
establishment of collaborations, the cost of preparing, filing, prosecuting,
maintaining, defending and enforcing patent claims, the status of competitive
products and the availability of other financing.


                                       33
<PAGE>   37
         The Corporation may need to raise substantial additional capital to
fund its operations in the future. The Corporation may seek such additional
funding through public or private equity or debt financings from time to time,
as market conditions permit, or through collaborative arrangements. The ability
of the Corporation to access the capital markets or to enlist strategic partners
is substantially dependent on the progress of its research and development
programs and regulatory approval of its products. There can be no assurance that
additional financing will be available on acceptable terms, if at all. If
adequate funds are not available, the Corporation may be required to delay,
reduce the scope of, or eliminate one or more of its research and development
programs.


                              PLAN OF DISTRIBUTION

         Under an agreement (the "Agency Agreement") between First Marathon
Securities Limited, HSBC James Capel Canada Inc. (together, the "Agents") and
the Corporation dated April 27, 1999, the Agents have agreed to offer for sale
on a best efforts basis, if, as and when issued by the Corporation in accordance
with the terms of the Agency Agreement, up to 34,000,000 Common Shares at a
price of $0.50 (the "Issue Price"). It is expected that the closing of the issue
of the Common Shares will take place on or about May 6, 1999. In consideration
for their services on this offering, AltaRex has agreed to pay the Agents a fee
of $0.035 per Common Share sold, other than Common Shares sold to certain
officers and directors of the Corporation in respect of which the Corporation
has agreed to pay the Agents a fee of $0.0175 per Common Share. The Agents' fee
will be paid from the proceeds of this offering.

         The Corporation reserves the right to accept or reject any subscription
in whole or in part. While the Agents have agreed to use their best efforts to
sell the Common Shares, they are not obligated to purchase any Common Shares
which are not sold. The obligations of the Agents under the Agency Agreement may
be terminated, and the Agents may withdraw all subscriptions for Common Shares
on behalf of subscribers, at the Agents' discretion, upon the occurrence of
certain stated events including any material change in the business, personnel
or financial condition of the Corporation.

         The Corporation has granted to the Agents an option (the
"Over-Allotment Option") exercisable for 60 days following the date of the
closing of the offering to purchase up to 5,100,000 additional Common Shares at
the Issue Price solely to cover the over-allotments. This prospectus also
qualifies the distribution of the Over-Allotment Option and the Common Shares
issued upon exercise of the Over-Allotment Option.

         In addition, the Corporation has entered into option agreements with
each of the Agents pursuant to which the Agents will be granted an option (the
"Compensation Options") to purchase that number of Common Shares equal to 5% of
the Common Shares subscribed for pursuant to this offering. The Compensation
Options are exercisable at the Issue Price and expire on the second anniversary
of the date of the closing of the offering. This prospectus also qualifies the
distribution of the Compensation Options and Common Shares issuable upon
exercise of the Compensation Options.

         Pursuant to policy statements of the Ontario Securities Commission and
the Commission des valeurs mobilieres du Quebec, the Agents may not during the
period of distribution under this prospectus bid for or purchase Common Shares.
The foregoing restriction is subject to certain restrictions, as long as the bid
or purchase is not engaged in for the purpose of creating actual or apparent
active trading in, or raising the market price of the Common Shares. These
exceptions


                                       34
<PAGE>   38
include a bid or purchase permitted under the rules and by-laws of The Toronto
Stock Exchange relating to market stabilization and passive market-making
activities and a bid or purchase made for or on behalf of a customer where the
order was not solicited during the period of distribution. Pursuant to the first
mentioned exception, in connection with this offering, the Agents may over allot
or affect transactions which stabilize or maintain the market price of the
Common Shares at a level other than those which otherwise might prevail on the
open market. Such transactions may commence or be interrupted at any time during
the period of distribution.

         The securities offered under this prospectus have not been and will not
be registered under the United States Securities Act of 1933, as amended and,
subject to certain exceptions, may not be offered, sold or delivered directly or
indirectly, in the United States of America, its territories or possessions.


                                 USE OF PROCEEDS

         The estimated net proceeds to AltaRex from this offering, after
deducting the Agents' fee and the estimated expenses of the offering of
approximately $510,000, are $15.3 million. The Corporation will use the net
proceeds of this offering to fund the Corporation's antibody and clinical trial
costs of its lead products, OvaRex(TM) MAb for ovarian cancer and BrevaRex(TM)
MAb for multiple myeloma, with any remaining net proceeds to be used for working
capital requirements.

         The Corporation intends to use the aggregate of the net proceeds of
this offering as follows:

<TABLE>
<S>                                                                            <C>
OvaRex(TM)MAb antibody and clinical trial costs..............................  $      8.4  million
BrevaRex(TM)MAb  antibody and clinical trial costs...........................         4.3
Working capital requirements...............................................           2.6
                                                                               -------------------
                                       Total ..............................    $     15.3  million
                                                                               ===================
</TABLE>


         In each case, the amounts referred to above reflect estimated antibody
and clinical trial costs over a period of approximately 12 months. To the extent
that the aggregate net proceeds are less than as set forth above, such proceeds
will be applied to fund OvaRex(TM) MAb antibody and clinical trial costs in
priority to BrevaRex(TM) MAb antibody and clinical trial costs.


                             DIRECTORS AND OFFICERS

DIRECTORS

         The following table sets forth, for each director of AltaRex, the name,
municipality of residence, the year in which he became a director, and his
principal occupation. Directors are elected until the next annual meeting of
shareholders or, in the case of a vacancy or resignation, until a successor is
elected or appointed.

<TABLE>
<CAPTION>
NAME AND
MUNICIPALITY OF RESIDENCE                         DIRECTOR SINCE       PRINCIPAL OCCUPATION
- -------------------------                         --------------       --------------------
<S>                                              <C>                   <C>
DR. ANTOINE A. NOUJAIM......................     December 1, 1995      Chairman of the Board and Chief Scientific
         Edmonton, Alberta                                             Officer of AltaRex
</TABLE>



                                       35
<PAGE>   39
<TABLE>
<CAPTION>
NAME AND
MUNICIPALITY OF RESIDENCE                         DIRECTOR SINCE       PRINCIPAL OCCUPATION
- -------------------------                         --------------       --------------------
<S>                                              <C>                   <C>
RICHARD E. BAGLEY...........................     February 23, 1998     President and Chief Executive Officer of
         Weston, Massachusetts                                         AltaRex
WILLIAM R. MCMAHAN..........................       July 15, 1996       President, Oxbow Capital Corporation
         Calgary, Alberta
JEAN-CLAUDE GONNEAU.........................     January 29, 1997      Managing Director, Donaldson, Lufkin &
         Paris, France                                                 Jenrette

GEORGES HIBON(1)............................     January 19, 1998      Former Chairman and Chief Executive Officer,
         New York, New York                                            Pasteur Merieux Connaught, North America
THE HONOURABLE MONIQUE BEGIN................       May 14, 1998        Chairperson, Management Committee of the
         Ottawa, Ontario                                               Canadian Breast Cancer Research Initiative.
                                                                       Former Canadian Minister of National Health
                                                                       and Welfare

DR. JIM A. WRIGHT...........................       May 14, 1998        President & Chief Scientific Officer,
         Toronto, Ontario                                              GeneSense Technologies, Inc.
</TABLE>


Note:
(1)      Mr. Hibon has advised the Corporation that he does not intend to stand
         for election at the Corporation's annual and special meeting on May 19,
         1999.

EXECUTIVE OFFICERS

         The table below sets forth the name, municipality of residence, the
first year of employment with AltaRex and the position with AltaRex of each
executive officer of AltaRex on the date hereof.

<TABLE>
<CAPTION>
NAME AND
MUNICIPALITY OF RESIDENCE                    WITH ALTAREX SINCE      POSITION
- -------------------------                    ------------------      --------
<S>                                          <C>                     <C>
DR. ANTOINE A. NOUJAIM.................       December 1, 1995       Chairman of the Board and Chief Scientific
         Edmonton, Alberta                                           Officer

RICHARD E. BAGLEY......................      February 23, 1998       President and Chief Executive Officer
         Weston, Massachusetts

EDWARD M. FITZGERALD...................      September 28, 1998      Senior Vice President, Chief Financial Officer
         Dover, Massachusetts                                        and Secretary

DR. CHRISTOPHER F. NICODEMUS...........       January 25, 1999       Senior Vice President, Medical and Regulatory
         Charlestown,                                                Affairs
         Massachusetts

DR. THOMAS R. SYKES....................       January 2, 1996        Vice President, Preclinical and Support
         Acton, Massachusetts                                        Operations
</TABLE>



                                       36
<PAGE>   40
BIOGRAPHIES OF DIRECTORS AND EXECUTIVE OFFICERS

         Dr. Antoine A. Noujaim. Dr. Noujaim is the founder, Chairman and Chief
Scientific Officer of the Corporation. From inception of the Corporation to
February 22, 1998, Dr. Noujaim was also the President and Chief Executive
Officer of the Corporation. From 1985 to 1995, Dr. Noujaim was associated with
Biomira, a Canadian publicly-owned biotechnology company as an officer and a
director. From 1994 to 1995 he was President of Biomira's subsidiary, Biomira
Research. Prior to 1994 he was Senior Vice President of the Immunoconjugate
Division of Biomira. Dr. Noujaim is also Professor Emeritus of the University of
Alberta and a director of SYNSORB Biotech Inc. ("SYNSORB"), a Canadian publicly-
owned biotechnology company. Dr. Noujaim has served as an officer or Chairman of
various scientific organizations, editorial boards and national scientific
committees and has authored more than 200 publications.

         Richard E. Bagley. Mr. Bagley has been the President and Chief
Executive Officer and a Director of the Corporation since February 23, 1998.
Prior to joining the Corporation, Mr. Bagley was Chairman and Chief Executive
Officer of ProScript, Inc., a Massachusetts based biotechnology company from
1995 to 1998 and prior to that he was President and Chief Executive Officer of
ImmuLogic Pharmaceutical Corporation ("ImmuLogic"), a Massachusetts based
publicly-owned biotechnology company. Mr. Bagley previously held several
executive positions with Bristol-Myers Squibb Company from 1985 to 1990,
including President of E.R. Squibb & Sons, U.S. and President of SquibbMark.
Prior thereto, Mr. Bagley held executive positions with SmithKline Beecham
Corporation from 1968 to 1985, including President of SmithKline Consumer
Products.

         William R. McMahan. Mr. McMahan has been a Director of the Corporation
since July 15, 1996. He has served as President of Oxbow Capital Corporation and
Oxbow Investments Inc. from 1993 to present and Director of International
Marketing for Oxbow Research Limited from 1992 to 1993. Mr. McMahan is also the
President, Chief Executive Officer and a Director of Oxbow Equities Corp., a
mutual fund listed on The Toronto Stock Exchange. Mr. McMahan is a Director of
UltraVision, Inc. (contact lenses) and SYNSORB (biotechnology), all Canadian
publicly-traded companies.

         Jean-Claude Gonneau. Mr. Gonneau has been a Director of the Corporation
since 1996. He has been Managing Director of Donaldson, Lufkin & Jenrette, an
investment bank, in charge of capital market activity in Europe since 1991,
having served in London and Paris since 1985. Prior to that Mr. Gonneau held
various positions with First Boston Corporation in New York and London from 1981
to 1985 and with Banque Nationale de Paris, with a focus on cross-border
business, from 1977 to 1981.

         Georges Hibon. Mr. Hibon has been a Director of the Corporation since
February 1998. He is the former Chairman and Chief Executive Officer of Pasteur
Merieux Connaught ("PMC") NorthAmerica in charge of the United States, Canada
and Mexico. Mr. Hibon has over 30 years of experience in the pharmaceutical and
biotechnology industries in senior level positions with companies such as Merck
& Co. and Virogenetics as well as PMC.

         The Honourable Monique Begin. Ms. Begin has been a Director of the
Corporation since May 1998. She is Professor Emeritus at the University of
Ottawa and has served as the Dean of Faculty of Health Sciences at the same
institution. She is also Chair of the Management Committee of the Canadian
Breast Cancer Research Initiative. Ms. Begin is the former Minister of National
Health and Welfare Canada from September 1977 to September 1984 and, in that
capacity, authored the Canada Health Act of 1984.


                                       37
<PAGE>   41
         Dr. Jim A. Wright.Dr. Wright has been a Director of the Corporation
since May 1998. He is the founder, Chairman, President and Chief Executive
Officer of GeneSense Technologies Inc. established in 1987. He has also served
as the Terry Fox Senior Research Scientist at the National Cancer Institute of
Canada since 1990, Associate Director and Senior Scientist of the Manitoba
Institute of Cell Biology since 1989 and Professor of Microbiology, Biochemistry
and Molecular Biology at the University of Manitoba.

         Edward M. Fitzgerald. Mr. Fitzgerald has been Senior Vice President,
Chief Financial Officer and Secretary of the Corporation since September 28,
1998. Prior to joining the Corporation Mr. Fitzgerald was a consultant in
private practice. From 1992 to 1997, Mr. Fitzgerald was Director, Mergers &
Acquisitions and Director, Consumer Lending Group at BankBoston Corporation.
From 1978 to 1992 Mr. Fitzgerald was with Arthur Andersen & Co. in Boston,
holding the position of Partner from 1989 to 1992. Mr. Fitzgerald is a licensed
Certified Public Accountant.

         Dr. Christopher F. Nicodemus. Dr. Nicodemus has been Senior Vice
President, Medical and Regulatory Affairs of the Corporation since January 25,
1999. Prior to joining the Corporation, Dr. Nicodemus was Vice President,
Medical Affairs from 1998 to 1999 and Vice President, Clinical Operations from
1997 to 1998 of Diatide Inc., a biotechnology company. From 1993 to 1997 Dr.
Nicodemus was with ImmuLogic, in the position of Vice President, Medical Affairs
from 1994 to 1997 and Senior Director, Medical Affairs from 1993 to 1994. Prior
to joining ImmuLogic, he was Senior Associate Medical Director at Pfizer Labs
from 1992 to 1993.

         Dr. Thomas R. Sykes. Dr. Sykes has been with the Corporation since its
inception and is currently Vice President, Preclinical and Support Operations.
He has previously held other positions with the Corporation, including Vice
President, Product Development and Manufacturing Operations, Vice President,
Operations and Vice President, Pharmaceutical Development of the Corporation.
Prior to joining the Corporation Dr. Sykes held various positions with Biomira,
including Director, Pharmaceutical Research and Development at Biomira Research
from 1993 to 1995 and Director, Product Development of Biomira from 1990 to
1993.

AUDIT COMMITTEE

         The Board of Directors of AltaRex is required to elect annually from
among its members an audit committee comprised of not less than three members.
At present, the Audit Committee consists of Dr. Jim A. Wright, The Honourable
Monique Begin and Jean-Claude Gonneau. The Audit Committee must review the
annual and interim financial statements of AltaRex and report thereon to the
Board of Directors before such statements are approved by the Board of
Directors.



                                       38
<PAGE>   42
                             EXECUTIVE COMPENSATION

COMPENSATION OF EXECUTIVE OFFICERS

         The following table sets forth the compensation paid to Richard E.
Bagley, Dr. Antoine A. Noujaim, Dr. R. Madiyalakan, Dr. Thomas Sykes and Blaine
Schamber (the "Named Executive Officers") for each of the fiscal years ended
December 31, 1998 and 1997 and the period from July 17, 1996 to December 31,
1996, being the end of the first financial year of the Corporation following the
acquisition by the Corporation of all of the issued shares of AltaRex Inc.

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                           Annual Compensation                        Long-Term
                                                                                                       Compensa-
                                                                                                        tion
                                                                                                        Awards

                                                                                        Other          Common
                                                                                        Annual          Shares            All Other
                                                                                        Compen-          Under              Compen-
      Name and                                          Salary              Bonus        sation         Options            sation
 Principal Position                Year (5)               ($)                ($)          ($)           Granted (#)        ($)(4)
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                <C>                  <C>            <C>             <C>             <C>
Richard E. Bagley (1)                 1998               315,179             Nil           Nil             825,000           Nil
President and Chief                     -                      -               -             -                   -             -
 Executive Officer                      -                      -               -             -                   -             -
- -----------------------------------------------------------------------------------------------------------------------------------
Dr. Antoine A. Noujaim (1)            1998               220,000             Nil           Nil                 Nil         6,880
Chairman of the Board,                1997               220,000             Nil           Nil                 Nil         6,312
 Chief Scientific Officer and         1996                78,602             Nil           Nil             375,000           Nil
 Former President and Chief
 Executive Officer
- -----------------------------------------------------------------------------------------------------------------------------------
Dr. R. Madiyalakan (2)                1998               131,706             Nil           Nil                 Nil        32,991
Vice-President, Planning and          1997               105,000           5,771           Nil              10,000         3,997
 Chief Scientific Officer             1996                36,559             Nil           Nil              25,000           465
- -----------------------------------------------------------------------------------------------------------------------------------
Dr. Thomas Sykes                      1998               167,135             Nil           Nil                 Nil        51,589
Vice-President, Operations            1997               105,000             Nil           Nil              10,000         4,269
 Preclinical and Support              1996                36,559             Nil           Nil              25,000           465
- -----------------------------------------------------------------------------------------------------------------------------------
Blaine Schamber (3)                   1998               116,250             Nil           Nil              40,000        11,021
Controller; previously Vice-          1997               105,000             Nil           Nil              10,000         4,206
President, Finance and                1996                35,941             Nil           Nil              25,000           464
 Corporate Development
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>


Notes:

(1)      Dr. Noujaim became an officer of the Corporation on July 17, 1996 upon
         the acquisition by the Corporation of all of the issued shares of
         AltaRex Inc. Dr. Noujaim's salary was paid by AltaRex Inc. until May of


                                       39
<PAGE>   43
         1997. Dr. Noujaim ceased to be the President and Chief Executive
         Officer of the Corporation on February 23, 1998. Mr. Richard E. Bagley
         was appointed President and Chief Executive Officer of the Corporation
         on that date.

(2)      Dr. Madiyalakan ceased to be an officer of the Corporation in September
         1998. He currently serves as a consultant to the Corporation under a
         services agreement that expires on September 30, 1999 and the amounts
         which appear on the table do not include compensation earned
         thereunder.

(3)      Mr. Schamber ceased to be the Vice-President, Finance and Corporate
         Development of the Corporation in July, 1998. He currently serves as
         Controller of the Corporation.

(4)      Compensation under the column "All Other Compensation" is with respect
         to employee benefits such as health care, life insurance and a group
         retirement savings plan. In respect of Messrs. Madiyalakan and Sykes,
         such amounts include relocation expenses. The aggregate amount of
         perquisites and other personal benefits, securities and property did
         not exceed the lesser of $50,000 and 10 percent of the total annual
         salary and bonus of the Named Executive Officer.

(5)      1996 figures are for the period from July 17, 1996 to December 31,
         1996. 1997 and 1998 figures are for the period from January 1 to
         December 31 of those years.

STOCK OPTIONS

     The following table details information with respect to the grant of
options by the Corporation to the Named Executive Officers during the financial
year of the Corporation ended December 31, 1998.

<TABLE>
<CAPTION>
                                OPTION GRANTS DURING THE MOST RECENTLY COMPLETED FINANCIAL YEAR
                                                                                           MARKET VALUE OF
                                                                                             COMMON SHARES
                            COMMON SHARES     % OF TOTAL OPTIONS                          UNDERLYING OPTIONS
                            UNDER OPTIONS         GRANTED TO         EXERCISE OR BASE           ON THE
                               GRANTED           EMPLOYEES IN              PRICE            DATE OF GRANT        EXPIRATION
          NAME                    #             FINANCIAL YEAR       ($/COMMON SHARE)      ($/COMMON SHARE)          DATE
- ---------------------------------------------------------------------------------------------------------------------------
<S>                         <C>               <C>                    <C>                   <C>                  <C>
Richard E. Bagley              825,000               57%                  $3.00                 $3.00           March 4, 2003
Blaine J. Schamber             40,000                 3%                  $2.18                 $2.18           May 13, 2003
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

         The following table details information with respect to all options of
the Corporation exercised by the Named Executive Officers during the last
financial year of the Corporation and all options held by the Named Executive
Officers and outstanding on December 31, 1998.


         AGGREGATED OPTION EXERCISES DURING THE MOST RECENTLY COMPLETED
             FINANCIAL YEAR END AND FINANCIAL YEAR-END OPTION VALUES

<TABLE>
<CAPTION>
                                                                             UNEXERCISED            VALUE OF UNEXERCISED
                               COMMON SHARES                                  OPTIONS AT            IN-THE-MONEY OPTIONS
                                ACQUIRED ON            AGGREGATE               FINANCIAL            AT FINANCIAL YEAR-END
                                  EXERCISE           VALUE REALIZED            YEAR-END                 EXERCISABLE/
           NAME                     (#)                   ($)                EXERCISABLE/           UNEXERCISABLE($)(1)
                                                                           UNEXERCISABLE(#)
<S>                           <C>                    <C>                   <C>                      <C>
Richard E. Bagley                   Nil                   Nil                Nil/825,000                   NA/NA
Dr. Antoine A. Noujaim              Nil                   Nil              250,000/125,000                 NA/NA
Dr. Thomas R. Sykes                 Nil                   Nil                26,666/8,334                  NA/NA
Blaine J. Schamber                  Nil                   Nil               26,666/48,334                  NA/NA
Dr. R. Madiyalakan                  Nil                   Nil                 Nil/26,666                   NA/NA
</TABLE>


                                       40
<PAGE>   44
Note:
i.       None of the unexercised options were in-the-money as at December 31,
         1998.


EMPLOYMENT AGREEMENTS

         The Corporation entered into a letter agreement with Mr. Bagley dated
February 28, 1998 which provides that if Mr. Bagley's employment is terminated
without cause he will receive U.S. $250,000, equivalent to severance pay of one
year's salary.

         The Corporation entered into a letter agreement with Dr. Sykes dated
March 25, 1998 as amended on April 21, 1998 which provides that, if Dr. Sykes'
employment is terminated without cause prior to the year 2000, he will receive
U.S.$150,000, equivalent to severance pay of one year's salary, and, thereafter,
if terminated without cause, he will receive U.S. $75,000, equivalent to
severance pay of six months salary.

         The Corporation entered into an employment contract with Mr. Schamber
dated January 1, 1997. This agreement is for a three year term and is renewable
on an annual basis for additional and successive one year terms upon the
expiration of the initial three year term and each successive one year term at a
salary mutually agreeable by the Corporation and Mr. Schamber. If Mr. Schamber
is terminated at any time during the initial three year term of his employment
contract, then that he shall be entitled to the lesser of the balance of his
salary for the initial three year term of the employment contract and one year's
salary.

COMPENSATION OF DIRECTORS

         Effective in 1998, each director, with the exception of Dr. Noujaim and
Mr. Bagley, receives a fee of U.S. $10,000 per annum. Further, all directors are
eligible to receive stock options and are entitled to receive reimbursement of
their reasonable out-of-pocket disbursements incurred on the business of the
Corporation. In the aggregate, a total of $71,501 in fees was paid to the board
of directors during the period from January 1, 1998 to December 31, 1998.

         AltaRex provides liability insurance for directors and officers of
AltaRex. The policy does not distinguish between the liability insurance for its
directors and officers, the coverage being the same for both groups. The premium
for the 12-month period ending December 31, 1998 was approximately $32,000 all
of which was borne by AltaRex. The policy limit is $5,000,000 per year with a
corporate deductible of $25,000 per loss. The individual directors and officers
of AltaRex are insured against losses arising from claims against them for
certain of their acts, errors or omissions in such capacity. AltaRex is insured
against losses arising out of any liability to indemnify a director or officer.



                                       41
<PAGE>   45
                     INDEBTEDNESS OF DIRECTORS AND OFFICERS

         No individual who is, or at any time during the most recent completed
financial year of the Corporation was, a director, executive officer or senior
officer of the Corporation, nor any proposed nominee for election as a director
of the Corporation, nor any associate of any one of them is, or at any time
since the beginning of the most recent completed financial year of the
Corporation has been, indebted to the Corporation or any of its subsidiaries or
was indebted to another entity, which such indebtedness is, or was at any time
during the most recent completed financial year of the Corporation, the subject
of a guarantee, support agreement, letter of credit or other similar arrangement
or understanding provided by the Corporation or any of its subsidiaries, except
for Dr. Thomas Sykes.

                       TABLE OF INDEBTEDNESS OF DIRECTORS,
                     EXECUTIVE OFFICERS AND SENIOR OFFICERS

<TABLE>
<CAPTION>
                                                           LARGEST AMOUNT OUTSTANDING    AMOUNT OUTSTANDING
NAME AND PRINCIPAL                 INVOLVEMENT OF          DURING FISCAL YEAR ENDED      AS OF THE DATE HEREOF
POSITION                           ALTAREX                 DECEMBER 31, 1998
- --------------------------------------------------------------------------------------------------------------
<S>                                <C>                     <C>                           <C>
Dr. Thomas Sykes,                  Lender                  U.S. $25,000                  U.S. $25,000
Vice-President, Pre-
Clinical and Support
Operations
</TABLE>

         Dr. Sykes was granted a U.S. $25,000 loan in connection with his
relocation from Edmonton, Alberta to Waltham, Massachusetts. This loan bears no
interest during its stated term and is due in its entirety on May 14, 2003. Any
overdue amounts will bear interest at 9.5% per annum until paid.


                                  STOCK OPTIONS

STOCK OPTION PLAN

         At the special meeting of the shareholders of the Corporation held on
November 15, 1996, shareholders, among other things, approved the adoption of a
new Stock Option Plan (the "Plan"). In connection with the listing of the Common
Shares of the Corporation on The Toronto Stock Exchange (the "TSE") in December
of 1996, the TSE required that certain amendments be made to the Plan to conform
with certain rules and regulations of the TSE including an amendment to section
4 of the Plan whereunder the total number of Common Shares that may be issuable
under stock options granted under the Plan was changed from 10% of the issued
and outstanding common shares of the Corporation to a fixed number. At the May
29, 1997 meeting of the shareholders, that number was fixed at 1,544,206.

         At the annual and special meeting of shareholders held on May 14, 1998
the shareholders approved and adopted the following amendments to the Plan: (i)
Section 4 of the Plan was amended to increase the number of Common Shares
issuable under stock options granted under the Plan from 1,544,206 to 2,480,000,
such number being approximately 15% of the issued and outstanding common shares
of the Corporation as at March 31, 1998; and (ii) Section 5 of the Plan was
amended to provide the Board of Directors with the option of fixing the exercise
price of any stock options granted under the Plan at the weighted average of the
trading prices of the Common Shares of the Corporation as traded on the TSE on
the five days preceding the date of the grant of such stock options.


                                       42
<PAGE>   46
         The Corporation's directors have approved, subject to the approval of
shareholders of the Corporation and any necessary regulatory approval, further
amendments to the Plan. Such shareholder approval will be sought by the
Corporation at its annual and special meeting of shareholders to be held on May
19, 1999. If approved, the amendment to the Plan would (i) increase the maximum
number of Common Shares reserved for issuance under the Plan from 2,480,000 to
4,180,000 Common Shares, and (ii) increase the maximum exercise period of
options granted under the Plan from five years from the date of grant to ten
years from the date of grant.

         As at the date of this prospectus there were outstanding options to
purchase a total of 2,255,499 Common Shares under the Plan and the following
table sets out in detail all stock options issued and outstanding under the
Plan.

<TABLE>
<CAPTION>
                                        NUMBER OF
                                     SHARES UNDER                                 EXERCISE PRICE
          GROUP                            OPTION            DATE OF GRANT             PER SHARE         EXPIRY DATE (1)
<S>                                  <C>                 <C>                      <C>                 <C>
Directors (excluding                      382,500            July 26, 1996                  1.80           July 26, 2001
Executive Officers)                        12,500             July 8, 1997                  3.68            July 8, 2002
(six in total)                             30,000         January 22, 1998                  2.96        January 22, 2003
                                          100,000             May 21, 1998                  2.18            May 21, 2003
- ------------------------------------------------------------------------------------------------------------------------
Executive Officers                         25,000            July 26, 1996                  1.80           July 26, 2001
(four in total)                            10,000        February 11, 1997                  5.90       February 11, 2002
                                          824,130            March 4, 1998                  3.00           March 4, 2003
                                              870             July 6, 1998                  3.00            July 6, 2003
                                          175,000       September 15, 1998                  0.91      September 15, 2003
                                          175,000        December 23, 1998                  0.53       December 23, 2003
- ------------------------------------------------------------------------------------------------------------------------
Employees                                 108,500            July 26, 1996              1.806.00           July 26, 2001
(28 in total)                              13,333         February 4, 1997                  5.90        February 4, 2002
                                           10,000        February 11, 1997                  3.68       February 11, 2002
                                           14,000             July 8, 1997                  3.30            July 8, 2002
                                            3,000         November 7, 1997                  2.84        November 7, 2002
                                           10,000         February 1, 1998                  2.18        February 1, 2003
                                          105,000             May 21, 1998                  1.15            May 21, 2003
                                           50,000           August 4, 1998                  0.80          August 4, 2003
                                           50,000        November 30, 1998                             November 30, 2003
</TABLE>



                                       43
<PAGE>   47
<TABLE>
<CAPTION>
Consultants
<S>                                        <C>          <C>                                 <C>         <C>
Dr. Terry Allen...........                  5,000             July 8, 1997                  3.68            July 8, 2002
Dr. Richard Baum..........                 10,000             July 8, 1997                  3.68            July 8, 2002
Dr. Beatrice Leveugle.....                  5,000             July 8, 1997                  3.68            July 8, 2002
Dr. Gerry Miller..........                  5,000             July 8, 1997                  3.68            July 8, 2002
Dr. John Samuels..........                  5,000             July 8, 1997                  3.68            July 8, 2002
Dr. Constantine Bona......                 10,000             July 8, 1997                  3.68            July 8, 2002
Dr. Jean-Francois Chatal..                 10,000             July 8, 1997                  3.68            July 8, 2002
Dr. David Goodwin.........                 10,000             July 8, 1997                  3.68            July 8, 2002
Dr. James Lown............                 10,000             July 8, 1997                  3.68            July 8, 2002
Dr. Dean Mann.............                 10,000             July 8, 1997                  3.68            July 8, 2002
Dr. Paul Muller...........                 10,000             July 8, 1997                  3.68            July 8, 2002
Dr. Aldo Serafini.........                 10,000             July 8, 1997                  3.68            July 8, 2002
Dr. David Wishart.........                  5,000         November 7, 1997                  3.30        November 7, 2002
Dr. R. Madiyalakan........                 26,666       September 30, 1998                  0.72        October 30, 1999
Genome Securities Inc.....                 25,000            July 17, 1998                  1.40           July 17, 2003
</TABLE>


Note:
i.   The Corporation's directors have approved, subject to the approval of
     shareholders and any necessary regulatory approval, an amendment to the
     terms of certain outstanding options granted under the Plan extending the
     exercise period of such options from five years from the original date of
     grant to ten years from the original date of grant. The Corporation will
     seek shareholder approval for such amendments at its annual and special
     meeting of shareholders to be held on May 19, 1999.


WARRANTS

         In connection with the AHFMR Agreement, pursuant to which AHFMR
contributed $500,000 to the funding of the Canadian component of the current
North American Phase IIb trial of OvaRex(TM) MAb, the Corporation granted to
AHFMR warrants to purchase 41,667 Common Shares at an exercise price of $12.00
per share. Such warrants expire on May 1, 2000. See "Business of AltaRex -
Strategic Alliances and License Agreements - Alberta Heritage Foundation
Agreement".


                          DESCRIPTION OF SHARE CAPITAL

         The authorized share capital of the Corporation consists of an
unlimited number of Common Shares and an unlimited number of Preferred Shares.
As of the date hereof, 16,512,613 Common Shares and no Preferred Shares were
issued and outstanding as fully paid and non-assessable. In addition, 2,480,000
Common Shares are reserved for issuance under a stock option plan (which the
Corporation intends to increase to 4,180,000, subject to shareholder approval as
set out under the heading "Stock Options") and 41,667 Common Shares are reserved
for issuance upon the exercise of a warrant granted to the AHFMR.

         The holders of Common Shares are entitled to dividends, if as and when
declared by the directors, to one vote per Common Share at meetings of the
holders of Common Shares of the Corporation and, upon liquidation, to receive
such assets of the Corporation as are distributable to the holders of the Common
Shares. The Preferred Shares may be issued in one or more series, and the
directors are authorized to fix the number of preferred shares in each series
and to determine the designation, rights, privileges, restrictions and
conditions attached to the Preferred Shares of each series. The Preferred Shares
are entitled to a priority over the Common Shares in respect of the payment of
dividends and distribution of assets upon liquidation of the Corporation.



                                       44
<PAGE>   48
                                 DIVIDEND POLICY

         Since its incorporation, AltaRex has not paid any dividends on the
outstanding Common Shares. The future payment of dividends will be dependent
upon the financial requirements of the Corporation to fund future growth, the
financial condition of the Corporation and other factors which the Board of
Directors may consider appropriate in the circumstances. It is unlikely that
dividends will be paid in the foreseeable future.


                             PRINCIPAL SHAREHOLDERS

         The following table sets forth the particulars, as at the date of this
prospectus, with respect to those persons who, to the knowledge of the directors
or officers of the Corporation, beneficially own or exercise control or
direction over more than 10% of the Common Shares (being the only class of
shares of the Corporation outstanding):

<TABLE>
<CAPTION>
                                                                                            PERCENTAGE OF
NAME                                    NUMBER OF COMMON SHARES                             COMMON SHARES
- ----                                    -----------------------                             -------------
<S>                                     <C>                                                   <C>
DR. ANTOINE A. NOUJAIM                  3,924,700 Common Shares (1)                           23.8% (1)
</TABLE>


Note:
(1)  This number does not include 375,000 Common Shares issuable upon the
     exercise of stock options held by Dr. Noujaim which are exercisable at a
     price of $1.80 per share until July 26, 2001.

         As of the date hereof, to the knowledge of AltaRex's directors and
officers, there are no other persons who are holders of record or are beneficial
owners, directly or indirectly, of shares conferring over 10% of the voting
rights attached to the issued and outstanding Common Shares.

         Except as disclosed above, as at the date hereof, the current directors
and officers of AltaRex as a group own directly or indirectly or exercise
control or direction over a total of 508,159 Common Shares representing
approximately 3.0% of the issued and outstanding Common Shares.




                                       45
<PAGE>   49
               PRICE RANGE AND TRADING VOLUME OF THE COMMON SHARES

         The Common Shares are listed for trading on The Toronto Stock Exchange
(the "TSE") and have been so listed since December 1996, prior to which the
Common Shares were listed for trading on The Alberta Stock Exchange. The TSE has
conditionally approved the listing of the Common Shares offered pursuant to this
prospectus, subject to fulfillment by the Corporation of certain requirements of
the TSE. The following table summarizes the reported high and low trading prices
and volume of trading of the Common Shares on the TSE for the periods indicated:

<TABLE>
<CAPTION>
                                                  HIGH                 LOW        VOLUME
                                                   ($)                 ($)          ($)
1997
<S>                                              <C>                 <C>               <C>
First Quarter                                    $7.00               $5.00             1,189,686
Second Quarter                                    5.50                3.45             1,343,944
Third Quarter                                     4.30                2.50             1,958,491
Fourth Quarter                                    3.80                2.10               994,316
1998
First Quarter                                    $3.25               $2.25               537,211
Second Quarter                                    2.54                1.01               960,682
Third Quarter                                     1.92                0.71             2,359,806
Fourth Quarter                                    0.85                0.42             2,936,251
1999
January                                          $0.74               $0.47             1,179,319
February                                          0.67                0.48               581,986
March                                             0.65                0.42               469,274
April (to April 23)                               0.60                0.43               250,313
</TABLE>

                    CANADIAN FEDERAL INCOME TAX CONSEQUENCES

         In the opinion of McCarthy Tetrault, the following summary describes
the principal Canadian federal income tax considerations of acquiring, holding
and disposing of Common Shares offered under this prospectus. This summary is
applicable to an investor who acquires the Common Shares under this offering and
who for the purposes of the Income Tax Act (Canada) (the "Tax Act") deals at
arm's length with the Corporation, is a resident of Canada and holds Common
Shares as capital property. Securities generally will be capital property of the
holder unless the holder is a trader or dealer in securities or is engaged in an
adventure in the nature of trade in respect of them. This summary is not
applicable to holders of Compensation Options.

         This summary is not applicable to any holder which is a "financial
institution", as defined in section 142.2 of the Tax Act or to any holder an
interest in which would be a "tax shelter investment".

         This summary is based upon the facts set out in this prospectus, the
current provisions of the Tax Act and the regulations issued thereunder (the
"Regulations"), all specific proposals to amend the Tax Act and the Regulations
publicly announced by or on behalf of the Minister of Finance (Canada) prior to
the date hereof, and counsel's understanding of the current published
administrative practices of Revenue Canada. This summary is not exhaustive of
all possible Canadian federal income tax consequences and, except as noted
above, does not take into account or anticipate any changes in law, whether by
legislative, governmental or judicial action, and does not take into account tax
legislation or considerations of any province, territory or foreign
jurisdiction.


                                       46
<PAGE>   50
         THIS SUMMARY IS OF A GENERAL NATURE ONLY AND IS NOT INTENDED TO BE, AND
SHOULD NOT BE CONSTRUED TO BE, LEGAL OR TAX ADVICE TO ANY PROSPECTIVE HOLDER OF
COMMON SHARES, AND NO REPRESENTATIONS WITH RESPECT TO THE INCOME TAX
CONSEQUENCES TO ANY SUCH HOLDER ARE MADE. PROSPECTIVE HOLDERS SHOULD CONSULT
THEIR OWN TAX ADVISORS FOR ADVICE WITH RESPECT TO THE TAX CONSEQUENCES TO THEM
OF ACQUIRING, HOLDING AND DISPOSING OF COMMON SHARES, INCLUDING THE APPLICATION
AND EFFECT OF THE INCOME AND OTHER TAX LAWS OF ANY COUNTRY, PROVINCE, STATE OR
LOCAL TAX AUTHORITY.

DIVIDENDS

         Dividends received or deemed to be received on the Common Shares by an
investor who is an individual will be included in computing the investor's
income, and will be subject to the gross-up and dividend tax credit rules
normally applicable to taxable dividends received from taxable Canadian
corporations.

         Dividends received or deemed to be received on the Common Shares by an
investor that is a corporation generally will be included in the investor's
income. Such an investor will, however, generally be entitled to deduct the
amount of such dividends in computing taxable income. Certain corporations may
be liable under Part IV of the Tax Act to pay a refundable tax of 331/3% on
dividends received or deemed to be received on the Common Shares to the extent
that such dividends are deductible in computing taxable income.

DISPOSITION OF COMMON SHARES

         A disposition or a deemed disposition of a Common Share by an investor
will generally give rise to a capital gain (or a capital loss) equal to the
amount by which the actual or deemed proceeds of disposition, less reasonable
costs of disposition, exceed (or are exceeded by) the adjusted cost base of the
Common Share to the investor. Generally, three-quarters of any capital gain
realized will be included in computing the investor's income as a taxable
capital gain and three-quarters of any capital loss will be deductible, subject
to certain limitations, against net taxable capital gains of the year of
disposition or the three preceding years or any subsequent year. The full amount
of capital gains must be included in an individual's adjusted taxable income (as
defined by the Tax Act) for the purposes of computing such individual's
liability under the Tax Act for the alternative minimum tax. If the investor is
a corporation (or a partnership or trust of which a corporation is a member or
beneficiary), any such capital loss may in certain circumstances be reduced by
the amount of any dividends, including deemed dividends, which have been
received by the investor on the Common Share. Similar rules may apply where a
corporation is a member of a partnership or a beneficiary of a trust that owns
Common Shares or where a trust or partnership of which a corporation is a
beneficiary or a member is a member of a partnership or a beneficiary of a trust
that owns Common Shares.

         In the case of a disposition of a Common Share to the Corporation, a
holder will be deemed to receive a dividend to the extent the proceeds received
exceed the paid-up capital of the Common Share. The amount of such dividend will
reduce the proceeds of disposition to the holder for purposes of calculating the
capital gain (or loss) arising on the disposition.

         Certain corporations may be liable to pay an additional refundable tax
of 6 2/3% on their "aggregate investment income" for the year, which is defined
by the Tax Act to include an amount


                                       47
<PAGE>   51
in respect of taxable capital gains (but not dividends or deemed dividends
deductible in computing taxable income).


                                  RISK FACTORS

         An investment in the securities of the Corporation should be considered
highly speculative due to the nature of the business of the Corporation and the
present stage of its development. In evaluating the securities of the
Corporation, the following should be considered:

BIOMIRA LITIGATION

         On February 26, 1999, Biomira commenced legal action in the Province of
Alberta against AltaRex, the founder of AltaRex and certain other individuals
affiliated with AltaRex, claiming ownership of an invention disclosed in an
international patent application filed by AltaRex relating to certain aspects of
AltaRex's core technology, products, processes and their production. In the
action, Biomira is seeking, among other things, a court order declaring that it
is the sole owner of the invention and related intellectual property rights
therein, including the patent application, an injunction prohibiting AltaRex
from using the invention, and damages in the amount of $200,000,000. In response
to Biomira's action, the Corporation filed a statement of defence with the court
on April 21, 1999. See "Legal Proceedings". Although there can be no assurance
that Biomira's legal action will not be successful, AltaRex believes that
Biomira's claims are without merit and intends to defend against such action.

         If Biomira is successful in its action against the Corporation, the
ability of the Corporation to develop and commercialize its existing products
and future products based upon the invention described in the patent application
referred to above, including, in particular, its OvaRex(TM) MAb lead product,
may be materially and adversely affected and could be fully lost. In any event,
this litigation will, if it proceeds to trial, require the court to consider
complicated scientific evidentiary matters (such as the point at which
significant discoveries were made) and questions as to the contractual
interpretation of the Biomira License Agreement. It is not possible to predict
the court's position or disposition in these and other matters. In addition,
even if successful at trial, this litigation will result in significant expense
to the Corporation.

POSSIBLE EXPIRATION OR TERMINATION OF LICENSE AGREEMENT FOR MAB B43; LOSS OF
EXCLUSIVITY

         In 1995, the Corporation licensed the B43 Technology from Biomira,
including the antibody MAb B43, which is utilized in OvaRex(TM) MAb. The Biomira
License Agreement requires that the Corporation use its best efforts to
commercialize the B43 Technology and to spend certain minimum amounts to develop
the B43 Technology between 1995 and 1999. Biomira provided the Corporation with
written notice alleging that the Corporation was in default of certain reporting
obligations under the Biomira License Agreement and that Biomira will terminate
such agreement on June 1, 1999 unless such alleged defaults are fully cured on
or before such date. Biomira had previously given notice to the Corporation on
March 16, 1999 of the alleged default and that such agreement would terminate on
April 15, 1999. Although the Corporation believes it is currently in compliance
with all of the terms of the Biomira License Agreement, there can be no
assurance that the Corporation will be able to continue to meet the obligations
of the Biomira License Agreement. Should the Corporation's rights under the
Biomira License Agreement be terminated or cease to be exclusive, Biomira may
elect to license the B43 Technology to competitors of the Corporation. Although
the Corporation believes that it would have a competitive advantage over other
potential competitors based


                                       48
<PAGE>   52
on its lead time in the regulatory process, termination of the Biomira License
Agreement or the loss of exclusivity to the B43 Technology could have a material
adverse effect on the Corporation's business, its results of operations, its
financial condition and its ability to market and develop commercially viable
products based on the B43 Technology.

         Pursuant to the ISTC Funding Arrangement (see "Strategic Alliances and
License Agreements -Biomira License Agreement"), Biomira is required to obtain
the consent of ISTC to any license relating to technology developed pursuant to
the ISTC Funding Arrangements, including the B43 Technology. The Corporation
understands that Biomira has failed to obtain such consent with respect to the
license of the B43 Technology granted to the Corporation under the Biomira
License Agreement. In the past, in this regard, the Corporation has had
discussions with ISTC and Biomira. In the event of a breach of a term or
condition of the ISTC Funding Arrangements, ISTC may direct Biomira to transfer
to ISTC clear title to the B43 Technology. In such event, the Corporation may
need to obtain a license from ISTC to use the B43 Technology which may affect or
result in the loss of the Corporation's rights to the B43 Technology. To the
knowledge of the Corporation, ISTC has not, to date, taken any such action.

         In addition, the Biomira License Agreement expires November 30, 2010,
unless the parties mutually agree in writing to renew the Biomira License
Agreement. If at that time the Corporation cannot successfully renew the Biomira
License Agreement on terms acceptable to the Corporation, the Corporation may be
subject to competition from others to whom Biomira Research would be free to
license the Technology. Consequently, the loss of such exclusive Biomira License
Agreement or renewal of the Biomira License Agreement on different terms may
adversely affect the revenues, if any, from the sale of products that use the
Technology. The termination of, or loss of exclusivity of, the Biomira License
Agreement could have a material adverse affect on the Corporation's business,
results of operations and financial condition. In light of the current
litigation involving Biomira and the Corporation, the Corporation considers the
mutual agreement of the parties to renew the Biomira License Agreement to be
unlikely.

RELIANCE ON STRATEGIC RELATIONSHIPS

         The Corporation's future success is dependent on the development and
maintenance of strategic relationships. The Corporation intends to seek to enter
into strategic relationships with strategic partners to participate in and
finance the later stage clinical development of products as required by the FDA,
HPB, EMEA and other international drug regulatory agencies. The Corporation
expects that its strategic partners would then have the opportunity to market
the Corporation's products in return for payment to the Corporation of up-front
licensing fees, milestone payments, royalties or previously agreed upon transfer
prices on the sale of such products.

         The Corporation is seeking to enter into strategic relationships with
strategic partners to complete certain clinical trials required for registration
and regulatory approval of OvaRex(TM) MAb or BrevaRex(TM) MAb in world markets.
If the Corporation fails to enter into such strategic relationships on terms
favourable to the Corporation or if these strategic partners fail to effectively
complete the clinical trials, the regulatory approval of OvaRex(TM) MAb or
BrevaRex(TM) MAb may be delayed, and such delay may have a materially adverse
effect on the Company's results of operations and business. The Corporation also
intends to rely on strategic partners to market OvaRex(TM) MAb and BrevaRex(TM)
MAb. If the Corporation fails to enter such strategic partnerships or if these
strategic partners fail to effectively market OvaRex(TM) MAb or BrevaRex(TM)
MAb, the Corporation may lose the opportunity to successfully commercialize the
products. There can be no assurance that the Corporation will be able to enter
these strategic partnerships on terms that are acceptable to the Corporation.



                                       49
<PAGE>   53
         The Corporation does not manufacture its own antibodies but has, and
will seek to enter into, agreements with third parties to manufacture its
antibodies. Pursuant to the Draximage Alliance Agreement, Draximage will
fill/finish OvaRex(TM) MAb vials for clinical trials and may have certain
contingent rights with respect to the manufacture and/or marketing of the
OvaRex(TM) MAb drug for commercial purposes. In addition, the Corporation is
working with other vendors to fill/finish OvaRex(TM) MAb vials. The Corporation
has an agreement with Lonza Biologics to scale-up cell culture-derived material
to the commercial level. Similarly the Corporation is working with other vendors
to begin the scale-up processes for cell culture BrevaRex(TM) MAb and to
fill/finish BrevaRex(TM) MAb vials. If these contract suppliers fail to perform
under the terms of the agreement, the Corporation may incur significant costs
and risks.

         Scaling-up production of cell culture-derived materials will enable the
Corporation to further pursue regulatory approval and commercialization of
OvaRex(TM) MAb. Such regulatory approval and commercialization is dependant upon
the Corporation's ability to achieve such production.

         The Corporation also relies on a number of alliances and collaborative
partnerships for the development of its products. There is no guarantee that
these relationships will continue or result in any successful developments.

UNCERTAINTY ASSOCIATED WITH PRECLINICAL AND CLINICAL TESTING

         Before obtaining regulatory approvals for the commercial sale of any of
the Corporation's potential new products, the products will be subjected to
extensive preclinical and clinical testing to demonstrate their safety and
efficacy in humans. Results of the initial preclinical and clinical testing of
products under development by the Corporation are not necessarily indicative of
results that will be obtained from subsequent or more extensive preclinical and
clinical testing. Furthermore, there can be no assurance that clinical trials of
products under development will be completed or will demonstrate the safety and
efficacy of such products at all or to the extent necessary to obtain regulatory
approvals. Companies in the biotechnology industry have suffered significant
setbacks in advanced clinical trials, even after achieving promising results in
earlier trials. The failure to adequately demonstrate the safety and efficacy of
a therapeutic product under development could delay or prevent regulatory
approval of such product.

         The rate of completion of clinical trials depends on, among other
factors, the enrollment of patients. Patient accrual is a function of many
factors, including the size of the patient population, the proximity of patients
to clinical sites, the eligibility criteria for the study and the existence of
competitive clinical trials. Delays in planned patient enrollment in the
Corporation's current clinical trials or future clinical trials may result in
increased costs, program delays, or both.

LACK OF PRODUCT REVENUES; HISTORY OF LOSSES

         To date, the Corporation has not recorded any revenues from the sale of
biopharmaceutical products and there can be no assurance that significant
additional losses will not occur in the near future or that the Corporation will
be profitable in the future. The Corporation has accumulated net losses of
approximately $20.2 million to December 31, 1998. The Corporation anticipates
that its operating expenses and capital expenditures will increase significantly
in 1999 and in subsequent years as it adds the personnel and facilities
associated with advancing products throughout development, clinical trials and
commercialization. The amounts and timing of expenditures will depend on the
progress of ongoing research and development, the results of preclinical testing
and clinical trials, the rate at which operating losses are incurred, the
execution of any development and licensing agreements


                                       50
<PAGE>   54
with strategic partners, the Corporation's development of additional products,
the FDA, HPB, EMEA and other regulatory processes and other factors, many of
which are beyond the Corporation's control.

         The Corporation does not expect to receive revenues from commercial
sales of its new products for several years, if at all. The Corporation expects
to continue to incur losses unless and until such time as strategic alliance
payments, product sales and royalty payments generate sufficient revenues to
fund its continuing operations. The ability of the Corporation to achieve
profitability in subsequent years depends upon, among other things, successfully
completing product development efforts and obtaining regulatory approval for its
lead clinical products. The development of the Corporation's products will
require the commitment of substantial resources to conduct the time-consuming
development of products to meet market and regulatory requirements and to
establish strategic relationships for production capabilities. There can be no
assurance that the Corporation will generate any revenues or achieve
profitability.

         The Corporation has two licensing agreements that require payments of
royalties based on the gross revenue of the OvaRex(TM) MAb. On the successful
commercialization of OvaRex(TM) MAb, the Corporation will be required to pay
royalties from the gross revenue received by the Corporation on the sale of this
product. There can be no assurance that the Corporation will generate sufficient
revenues from the sale of OvaRex(TM) MAb to achieve profitability.

         The Corporation anticipates that, based on its current operating plan,
its existing cash reserves are sufficient to meet its planned cash requirements
into the second half of 1999. Beyond that, the Corporation intends to rely on
cash from this offering and, if any, cash generated from operations, licensing
revenues and collaborative agreements, which will be highly dependent on the
Corporation's successful development and commercialization of its clinical
products. There can be no assurance that these products will be successfully
developed or commercialized or that the underlying assumed levels of expenses
will prove to be accurate. Further there can be no assurance that this offering
will be successful.

CAPITAL REQUIREMENTS

         Based on its current operating plan, the Corporation estimates that its
net expenditures for 1999 will significantly exceed that of 1998. The
Corporation's future capital requirements, however, will depend on many factors,
including continued scientific progress in its product discovery and development
program, progress in its pre-clinical and clinical evaluation of product
candidates, time and expense associated with filing, prosecuting and enforcing
its patent claims and costs associated with obtaining regulatory approvals. In
order to meet such capital requirements, the Corporation will consider contract
fees, collaborative research and development arrangements, and additional public
or private financing (including the issuance of additional equity securities) to
fund all or a part of particular programs. There can be no assurance that
additional funding will be available or, if available, that it will be available
on acceptable terms. If adequate funds are not available, the Corporation may
have to reduce substantially or eliminate expenditures for research and
development, testing, production and marketing of its proposed products, or
obtain funds through arrangements with corporate partners that require the
Corporation to relinquish rights to certain of its technologies or products.
There can be no assurance that this offering will be successful. Further, there
can be no assurance that the Corporation will be able to raise additional
capital if its capital resources are exhausted. The ability of the Corporation
to arrange such financing in the future will depend in part upon the prevailing
capital market conditions as well as the business performance of the
Corporation. There can be no assurance that the Corporation will be successful
in its efforts to arrange additional


                                       51
<PAGE>   55
financing if needed or that any such additional financing will be available on
terms satisfactory to the Corporation.

KEY PERSONNEL

         The Corporation is highly dependent on its senior officers, scientific
personnel, consultants and management staff, the loss of whose services might
significantly delay or prevent the Corporation's achievement of its scientific
or business objectives. Competition among biotechnology and biopharmaceutical
companies for qualified employees is intense, and the ability to retain and
attract qualified individuals is critical to the Corporation's success. There
can be no assurance that the Corporation will be able to attract and retain such
individuals currently or in the future on acceptable terms, or at all, and the
failure to do so would have a material adverse effect on the Corporation's
business, financial condition and results of operations.

REGULATORY ENVIRONMENT; NO ASSURANCE OF PRODUCT APPROVAL

         The FDA, HPB, EMEA and comparable agencies in foreign countries impose
substantial requirements on biotechnology and pharmaceutical companies prior to
the introduction of therapeutic products. These requirements include lengthy and
detailed laboratory and clinical testing procedures, sampling activities and
other costly and time-consuming procedures, together which involve the
expenditure of substantial resources. Satisfaction of these requirements
typically takes a number of years and varies substantially based on the type,
complexity and novelty of the pharmaceutical product.

         Any future FDA, HPB, EMEA or other governmental approval of products
developed by the Corporation may entail limitations on the indicated uses for
which such product may be marketed. Approved products may be subject to
additional testing and surveillance programs as required by regulatory agencies.
In addition, product approvals may be withdrawn or limited for noncompliance
with regulatory standards or the occurrence of unforeseen problems following
initial marketing.

         The effect of governmental regulation may be to delay marketing the
Corporation's products for a considerable period of time, to impose costly
requirements on the Corporation's activities or to provide a competitive
advantage to other companies that compete with the Corporation. Adverse clinical
results could have a negative impact on the regulatory process and timing. A
delay in obtaining or failure to obtain regulatory approvals could adversely
affect the marketing of the Corporation's products and the Corporation's
liquidity and capital resources. In addition, future legislation or
administrative action may result in governmental regulations adverse to the
Corporation. The extent of potentially adverse governmental regulation that
might arise from future legislation or administrative action cannot be
predicted.

         To date, the Corporation has submitted INDs to the HPB and FDA for
OvaRex(TM) MAb and BrevaRex(TM) MAb products, but has not submitted such
documentation for other products currently under development. There can be no
assurance that the Corporation will obtain regulatory approval to commercialize
OvaRex(TM) MAb and BrevaRex(TM) MAb, or that it will be in a position to file
the regulatory applications for its future products.

COMPETITION

         Technological competition in the pharmaceutical industry is intense.
There are many companies and institutions, both public and private, including
pharmaceutical companies, chemical


                                       52
<PAGE>   56
companies, specialized biotechnology companies and research, government or
academic institutions, that are engaged in developing synthetic pharmaceuticals
and biotechnological products for human therapeutic applications, including the
applications targeted by the Corporation. The Corporation may have to compete
with these competitors to develop products aimed at treating similar conditions.
Many of these competitors have substantially greater resources than the
Corporation. There can be no assurance that developments by others will not
render the Corporation's products or technologies non-competitive or adversely
affect the commitment of the Corporation's commercial collaborators to the
Corporation's programs.

         The pharmaceutical industry is also characterized by extensive research
efforts and rapid technological change. Competition can be expected to increase
as technological advances are made and commercial applications for
biopharmaceutical products increase. Competitors of the Corporation may use
different technologies or approaches to develop products similar to products
which the Corporation is seeking to develop, or may develop new or enhanced
products for processes that may be more effective, less expensive, safer or more
readily available before the Corporation obtains approval of its products. There
can be no assurance that the Corporation's products will compete successfully or
that research and development will not render the Corporation's products
obsolete or uneconomical.

PROPRIETARY RIGHTS AND PATENT PROTECTION

         Due to the length of time and expense associated with bringing new
products through development and the governmental approval process to the
marketplace, the pharmaceutical industry has traditionally placed considerable
importance on obtaining and maintaining patent and trade secret protection for
significant new technologies, products and processes.

         The patent protection afforded to biotechnology and pharmaceutical
firms is uncertain and involves many complex legal, scientific and factual
questions. There is no clear law or policy involving the breadth of claims
allowed in such cases, or the degree of protection afforded under patents. These
issues are further complicated in this field by the abundance of publications
and/or prior art, including publications by the Corporation. Thus, while the
Corporation believes that its proprietary information is protected to the
fullest extent practicable, there can be no assurance that (i) any patents will
be issued to the Corporation in any or all appropriate jurisdictions, (ii)
litigation will not be commenced seeking to challenge the Corporation's patent
protection or that such challenges will not be successful, (iii) processes or
products of the Corporation do not or will not infringe upon the patents of
third parties, or (iv) the scope of patents that may be issued to the
Corporation will successfully prevent third parties from developing similar and
competitive products. It is not possible to predict how any patent litigation
will affect the Corporation's efforts to develop, manufacture or market its
products. The cost of litigation to uphold the validity and prevent infringement
of any patents issued to the Corporation may be significant. See "-Biomira
Litigation" and "Legal Proceedings".

         The products developed by the Corporation also incorporate technology
and processes that will not be protected by any patent and are capable of being
duplicated or improved upon by competitors. Accordingly, the Corporation may be
vulnerable to competitors, which develop competing technology, whether
independently or as a result of acquiring access to the proprietary products and
trade secrets of the Corporation. In addition, the Corporation may be required
to obtain licenses under patents or other proprietary rights of third parties.
No assurance can be given that any licenses required under such patents or
proprietary rights will be available on terms acceptable to the Corporation. If
the Corporation does not obtain such licenses, it could encounter delays in
introducing one or more of its


                                       53
<PAGE>   57
products to the market while it attempts to design around such patents, or could
find that the development, manufacture or sale of products requiring such
licenses could be foreclosed.

         There can be no assurance that the Corporation's patent applications
will mature into issued patents, or will afford legal protection against
competitors, or will provide significant proprietary protection or competitive
advantage. In addition, there can be no assurance that the Corporation's patents
will not be held invalid or unenforceable by a court, infringed or circumvented
by others or that others will not obtain patents that the Corporation would need
to license or circumvent. Competitors or potential competitors may have filed
patent applications or received patents, and may obtain additional patents and
proprietary rights relating to the products or processes competitive with those
of the Corporation.

MANUFACTURING AND MARKETING

         The Corporation has limited experience in manufacturing
pharmaceuticals. The Corporation intends to rely primarily on contract
manufacturers to produce antibodies, adjuvants and other components of its
products for research and development, preclinical and clinical trial purposes.
The Corporation's products have never been manufactured on a commercial scale,
and there can be no assurance that such products can be manufactured at a cost
or in quantities necessary to make them commercially viable. There can be no
assurance that third party manufacturers will be able to meet the Corporation's
needs with respect to timing, quantity or quality. If the Corporation is unable
to contract for a sufficient supply of required products and substances on
acceptable terms, or if it should encounter delays or difficulties in its
relationships with manufacturers, the Corporation's preclinical and clinical
testing would be delayed, thereby delaying the submission of products for
regulatory approval or the market introduction and subsequent sales of such
products. Any such delay may have a material adverse effect on the Corporation's
business, financial condition and results of operations. Moreover, contract
manufacturers that the Corporation may use must continually adhere to current
Good Manufacturing Practices regulations enforced by the FDA through its
facilities inspection program. If the facilities of such manufacturers cannot
pass a pre-approval plant inspection, the FDA premarket approval of the
Corporation's products will not be granted.

         The Corporation currently has no sales, marketing or distribution
experience. The Corporation intends to rely on its current and future strategic
partners, to market its products; however, there can be no assurance that such
corporate partners have effective sales forces and distribution systems. If the
Corporation is unable to maintain or establish such relationships and is
required to market any of its products directly, the Corporation will have to
develop a marketing and sales force with technical expertise and with supporting
distribution capabilities. There can be no assurance that the Corporation will
be able to maintain or establish such relationships with third parties or
develop in-house sales and distribution capabilities. To the extent that the
Corporation depends on its strategic partners or third parties for marketing and
distribution, any revenues received by the Corporation will depend upon the
efforts of such strategic partners or third parties, and there can be no
assurance that such efforts will be successful.

         There can be no assurance that any products successfully developed by
the Corporation, if approved for marketing, will ever achieve market acceptance.
The Corporation's products, if successfully developed, will compete with a
number of traditional drugs and therapies manufactured and marketed by major
pharmaceutical and other biotechnology companies, as well as new products
currently under development by such companies and others. The degree of market
acceptance of any products developed by the Corporation will depend on the
clinical efficacy and safety of the product candidates, their potential
advantage over alternative treatment methods and reimbursement policies


                                       54
<PAGE>   58
of government and third-party payors. There can be no assurance that physicians,
patients or the medical community in general will accept and utilize any
products that may be developed by the Corporation, and the lack of such market
acceptance would have a material adverse effect on the Corporation's business,
financial condition and results of operations.

PRODUCT LIABILITY AND INSURANCE

         The testing, marketing, sale and use of products under development by
the Corporation may entail risk of product liability. Such risk exists in human
clinical trials and even with respect to those products that receive regulatory
approval for commercial sale. There can be no assurance that the Corporation can
avoid significant product liability exposure. The Corporation currently has in
place product liability insurance for its biopharmaceutical products and expects
that as it expands, it will require additional insurance. There can be no
assurance that it will be able to obtain appropriate levels of product liability
insurance prior to any sale of its biopharmaceutical products. An inability to
obtain insurance on economically feasible terms or to otherwise protect against
potential product liability claims could inhibit or prevent the
commercialization of products developed by the Corporation. The obligation to
pay any product liability claim or recall a product could have a material
adverse effect on the business, financial condition and future prospects of the
Corporation.

UNSTABLE SHARE PRICE

         Market prices for securities of biotechnology companies generally, and
of common shares in particular, are volatile. Factors such as announcements
(publicly made or at scientific conferences) of technological innovations, new
commercial products, patents, the development of proprietary rights by the
Corporation or others, results of clinical trials, regulatory actions,
publications, quarterly financial results or public concern over the safety of
biotechnological products, future sales of Common Shares by the Corporation or
by its current shareholders and other factors could have a significant effect on
the market price of the Common Shares of the Corporation.

NO ASSURANCE OF SUCCESSFUL DEVELOPMENT

         Prospects for companies in the biotechnology industry generally may be
regarded as uncertain given the nature of the industry and, accordingly,
investments in biotechnology companies should be regarded as highly speculative.
The Corporation's realization of its long-term potential will be dependent upon
the successful development and commercialization of products currently under
development. There can be no assurance that these products will be delivered
successfully or receive regulatory approval. The new products of the Corporation
are currently in the research and development stages, the riskiest stages for a
company in the biotechnology industry. There can be no assurance that the
research and development programs conducted by the Corporation will result in
commercially viable products. To achieve profitable operations the Corporation,
alone or with others, must successfully develop, introduce and market its
products. To obtain regulatory approvals for the products being developed and to
achieve commercial success, human clinical trials must demonstrate that the
products are safe for human use and that they show efficacy. Unsatisfactory
results obtained from a particular study relating to a program may cause the
Corporation to abandon its commitment to that program. No assurances can be
provided that any future animal or human test, if undertaken, will yield
favourable results.


                                       55
<PAGE>   59
                       INTERESTS OF MANAGEMENT AND OTHERS
                            IN MATERIAL TRANSACTIONS

         The only transactions in which the directors or officers of AltaRex or
any of the principal shareholders of AltaRex mentioned under "Principal
Shareholders", or any associate or affiliate of any of the foregoing persons or
companies has had, since March 16, 1996, a material interest, direct or
indirect, which has materially affected or will materially affect AltaRex or any
of its subsidiaries are as follows:

a)       On July 17, 1996 the Corporation acquired all of the issued and
         outstanding shares of AltaRex Inc. for a purchase price satisfied by
         the issuance by the Corporation of 7,525,000 Common Shares (the
         "AltaRex Acquisition"). As a result, the former shareholders of AltaRex
         Inc. became the controlling shareholders of the Corporation and AltaRex
         Inc. became a wholly owned subsidiary of the Corporation. Each of the
         officers and directors of the Corporation at that time, including Dr.
         Noujaim and Mr. McMahan directly or indirectly owned shares of AltaRex
         Inc. prior to the AltaRex Acquisition and therefore received Common
         Shares of the Corporation pursuant to the AltaRex Acquisition. The
         numbers of Common Shares of the Corporation referred to in this
         paragraph have been adjusted to reflect a consolidation of the Common
         Shares of the Corporation which was effected in November of 1996.

2.       AltaRex Inc. entered into loan agreements with several individuals
         between January 1, 1996 and July 17, 1996 pursuant to which it borrowed
         $1,100,000 (the "Bridge Financing"). Dr. Antoine A. Noujaim and 668355
         Alberta Ltd. loaned $100,000 and $400,000 respectively to AltaRex Inc.
         pursuant to the bridge financing. The loans from Dr. Noujaim and 668355
         Alberta Ltd. were unsecured loans bearing interest at 12% per annum.
         The bridge financing was repaid in full by AltaRex Inc. on July 30,
         1996. William R. McMahan, a director of the Corporation, is a director
         of 668355 Alberta Ltd. and a trust established for the benefit of his
         family is a major shareholder of 668355 Alberta Ltd.


                               MATERIAL CONTRACTS

         Except for contracts entered into the normal course of its business,
the only material contract entered into by AltaRex during the past two years
prior to the date hereof is the Agency Agreement between the Agents and AltaRex
referred to in "Plan of Distribution". Copies of such agreement may be consulted
at AltaRex's offices at Campus Tower, Suite 300, 8625 - 112 Street, Edmonton,
Alberta T6G 1K8 or at 303 Wyman Street, Suite 125, Waltham, Massachusetts 02154
during normal business hours.


                                 ESCROWED SHARES

         As at the date of this prospectus, a total of 2,649,552 Common Shares
are held in escrow pursuant to two separate escrow agreements.

         Pursuant to an escrow agreement dated November 24, 1993 among Montreal
Trust, the Corporation and certain initial shareholders of the Corporation (the
"Initial Escrow Agreement"), such initial shareholders deposited certain Common
Shares with Montreal Trust, to be held in escrow pursuant to the terms and
conditions if the Initial Escrow Agreement. The Initial Escrow Agreement
provides that the Common Shares held thereunder may not be traded, released,
transferred or dealt


                                       56
<PAGE>   60
with in any manner without the consent of the Executive Director of the Alberta
Securities Commission (the "ASC Director"). Two thirds of such Common Shares
have been released and the remaining 214,779 Common Shares may be released on
July 17, 1999 upon consent of the ASC Director.

         As a condition of a share purchase agreement between two predecessor
corporations (which subsequently amalgamated to form AltaRex) and all of the
then shareholders of the Corporation, certain shareholders of the Corporation
also entered into an escrow agreement dated July 16, 1996 with the Corporation
and Montreal Trust (the "Voluntary Escrow Agreement"), pursuant to which such
shareholders agreed to deposit certain Common Shares in escrow with Montreal
Trust. The Voluntary Escrow Agreement provides that the Common Shares deposited
thereunder may not be traded, released, transferred or dealt with in any manner.
The Voluntary Escrow Agreement allows for the remaining shares held thereunder
to be released from escrow on a basis pro rata to each shareholder of one common
share for each $1.20 of gross research and development costs incurred by the
Corporation, up to a maximum of 2,396,667 Common Shares in any one year. A total
of 2,434,773 Common Shares remain subject to the Voluntary Escrow Agreement.


                                  LEGAL MATTERS

         Certain legal matters relating to this offering will be reviewed by
McCarthy Tetrault on behalf of AltaRex and by Fogler, Rubinoff on behalf of the
Agents.


                                LEGAL PROCEEDINGS

THE BIOMIRA CLAIM

         On February 26, 1999, Biomira commenced legal action (the "Biomira
Claim") in the Province of Alberta against the Corporation and the founder of
AltaRex and certain other individuals affiliated with AltaRex (the "Individual
Defendants"), claiming ownership of an invention (the "Invention") disclosed in
an international patent application entitled "Method and Composition for
Reconforming Multi-Epitopic Antigens to Initiate an Immune Response" (the
"Multi-Epitopic Patent Application") and filed by AltaRex relating to certain
aspects of AltaRex's core technology, products, processes and their production.
In the action, Biomira is seeking, among other things, a court order declaring
that it is the sole owner of the invention and related intellectual property
rights therein, including the Multi-Epitopic Patent Application, an injunction
prohibiting AltaRex from using the invention, and damages in the amount of
$200,000,000. The Biomira Claim alleges that the Individual Defendants owed
fiduciary duties and/or duties of confidence to Biomira arising out of such
individuals' affiliation with Biomira prior to the formation of AltaRex and that
the Individual Defendants have breached those duties by causing the
Multi-Epitopic Patent Application to be filed for AltaRex's benefit. In
addition, the Biomira Claim alleges that the Corporation intentionally or
negligently induced the Individual Defendants to breach such alleged duties. On
March 16, 1999, the Corporation demanded further particulars from Biomira with
respect to the allegations made in its legal action against the Corporation on
the basis that such action fails to disclose sufficient information with respect
to claims made by Biomira in its action so as to enable the Corporation to
properly defend the action. On April 7, 1999, Biomira responded to the
Corporation's request by refusing to provide further particulars with respect to
its claims. On April 15, 1999, the Court of Queen's Bench of Alberta refused to
grant a motion by the Corporation to require Biomira to provide such further
particulars.


                                       57
<PAGE>   61
         On April 21, 1999, the Corporation filed its statement of defence to
the Biomira Claim. In its statement of defence, the Corporation denies all of
the allegations contained in the Biomira Claim. In particular, the Corporation
maintains that (i) the Invention was entirely conceived, fashioned and developed
by the Individual Defendants, who are fully and properly disclosed as the
"inventors" of the Multi-Epitopic Patent Application, (ii) the Invention was
arrived at by the Individual Defendants in all material respects while in the
employ of and under obligation to AltaRex and not in any material respect in the
course of work by any of them for Biomira or an affiliate thereof, (iii) it was
at all material times agreed and understood by Biomira that, pursuant to certain
previously agreed principles, the Biomira License Agreement and the license
granted thereunder, the Individual Defendants and AltaRex were authorized,
enabled and licensed from and after the commencement of operations of AltaRex on
December 1, 1995 to proceed and continue with research, development and product
creation for the sole benefit of the Corporation and not for that of Biomira,
and (iv) neither AltaRex nor any of the Individual Defendants acted in breach of
any obligations to or entitlements of Biomira. Alternatively, the Corporation
maintains that if Biomira has any claim whatsoever to the Multi-Epitopic Patent
Application, the Biomira License Agreement grants to the Corporation an
exclusive, world-wide license to the Invention and all related rights and
entitlements and, accordingly, Biomira is precluded from asserting the purported
entitlements alleged in the Biomira Claim.

         Although there can be no assurance that Biomira will not be successful
in the Biomira Claim and neither Biomira nor the Corporation has had an
opportunity to request production of documents or to discover the other party,
management of the Corporation believes that the Biomira claim is without merit.
The Corporation intends to vigorously defend the Biomira Claim. See "Risk
Factors - Biomira Litigation".

         If Biomira is successful in its action against the Corporation, the
ability of the Corporation to develop and commercialize its existing products
and future products based upon the invention described in the patent application
referred to above, including, in particular, its OvaRex(TM( MAb lead product,
may be materially and adversely affected and could be fully lost. In any event,
this litigation will, if it proceeds to trial, require the court to consider
complicated scientific evidentiary matters (such as the point at which
significant discoveries were made) and questions as to the contractual
interpretation of the Biomira License Agreement. It is not possible to predict
the court's position or disposition in these and other matters. In addition,
even if successful at trial, this litigation will result in significant expense
to the Corporation.

THE ALTAREX CLAIM

         On March 16, 1999, the Corporation commenced legal action (the "AltaRex
Claim") in the Province of Alberta against Biomira seeking a declaration of the
court that, among other things, (i) Biomira is in breach of the Biomira License
Agreement and the Asset Purchase Agreement, (ii) the Corporation has the
exclusive worldwide right and license to use the B43 Technology to develop,
commercialize, manufacture, use and sell products based upon such technology
(including OvaRex(TM) MAb), (iii) the Corporation has the exclusive right under
the Biomira License Agreement to develop, commercialize, use and sell all AIT(R)
Technology applications, (iv) as a result of its breaches of the Biomira License
Agreement, Biomira is not entitled to any rights under the Biomira License
Agreement, and (v) the terms of the Biomira License Agreement prohibit Biomira
from bringing the Biomira Claim. In addition, the Corporation is seeking an
injunction prohibiting Biomira from pursuing its legal action against the
Corporation and damages in an amount to be proven at trial.

         On March 31, 1999, Biomira filed a statement of defence in respect of
the AltaRex Claim. In its statement of defence, Biomira denies the allegations
contained in the AltaRex Claim. In


                                       58
<PAGE>   62
particular, Biomira maintains that (i) there were not any agreed principles
between Biomira and AltaRex and their respective representatives in addition to
those set forth in the Biomira License Agreement and the Asset Purchase
Agreement, (ii) Biomira has not breached the Biomira License Agreement, and
(iii) the Biomira License Agreement does not grant to AltaRex the exclusive
right to develop, commercialize, use and sell all AIT(R) Technology
applications.

         Neither Biomira nor the Corporation has had an opportunity to request
production of documents or to discover the other party in connection with the
AltaRex Claim.

OTHER

         Except for non-material legal proceedings against it in the normal
course of its operations, the Corporation is not aware of any other material
existing or pending legal proceedings against it.


                     AUDITORS, TRANSFER AGENT AND REGISTRAR

         The auditors of AltaRex are Ernst & Young LLP, Chartered Accountants,
located at Suite 1800, Scotia 2, Scotia Place 10060 Jasper Avenue, Edmonton,
Alberta T5J 3R8.

         The transfer agent and registrar for the Common Shares is Montreal
Trust Company of Canada at its offices in Calgary, Alberta and Toronto, Ontario.


                                    PROMOTERS

         Dr. Antoine A. Noujaim and William R. McMahan may each be considered
promoters under applicable securities laws by virtue of their role in founding
and organizing the business of the Corporation in 1996. Each of Messrs. Noujaim
and McMahan is a director and/or officer of the Corporation and as such receives
a fee for services provided to the Corporation in such capacity. See "Executive
Compensation - Compensation of Directors".


                          PURCHASERS' STATUTORY RIGHTS

         Securities legislation in certain provinces provides purchasers with
the right to withdraw from an agreement to purchase securities within two
business days after receipt or deemed receipt of a prospectus or any amendment
thereto. In several of the provinces, applicable securities legislation further
provides a purchaser with remedies for rescission or, in some jurisdictions,
damages where the prospectus or any amendment thereto contains a
misrepresentation or is not delivered to the purchaser, provided that such
remedies for rescission or damages are exercised by the purchaser within the
time limit prescribed by the securities legislation of the purchaser's province.
The purchaser should refer to any applicable provisions of the securities
legislation of their province for the particulars of these rights or consult
with a legal advisor.



                                       59
<PAGE>   63
                      CONSOLIDATED FINANCIAL STATEMENTS OF

                                  ALTAREX CORP.

                  YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996
              AND THE PERIOD DECEMBER 1, 1995 TO DECEMBER 31, 1998




                                       F-1
<PAGE>   64
                                AUDITORS' REPORT



To the Directors of
ALTAREX CORP.

We have audited the consolidated balance sheets of ALTAREX CORP. as at December
31, 1998 and 1997 and the consolidated statements of loss and accumulated
deficit, and the consolidated statements of cash flows for the years ended
December 31, 1998, 1997, 1996 and the period December 1, 1995 to December 31,
1998. 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 in accordance with generally accepted auditing
standards. Those standards require that we plan and perform an audit to obtain
reasonable assurance 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. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.

In our opinion, these consolidated financial statements present fairly, in all
material respects, the financial position of the Company as at December 31, 1998
and 1997 and the results of its operations and the changes in its financial
position for the years ended December 31, 1998, 1997, 1996 and the period
December 1, 1995 to December 31, 1998 in accordance with accounting principles
generally accepted in Canada.



Edmonton, Canada                                               Ernst & Young LLP
February 12, 1999                                          Chartered Accountants
(except as to note 11 which is
as of April 27, 1999)

                                       F-2
<PAGE>   65
ALTAREX CORP.


                           CONSOLIDATED BALANCE SHEETS

As at December 31

<TABLE>
<CAPTION>
                                                                              1998                 1997
(In Canadian dollars)                                                          $                   $
- ----------------------------------------------------------------------------------------------------------
<S>                                                                        <C>                  <C>
ASSETS
CURRENT ASSETS
Cash and short-term investments                                             12,823,420          25,002,106
Accounts receivable                                                             78,616             192,299
Investment tax credit receivable                                                     -             247,734
Prepaid expenses                                                               174,293              89,096
- ----------------------------------------------------------------------------------------------------------
                                                                            13,076,329          25,531,235
DEPOSITS AND OTHER ASSETS [note 2]                                             322,840             185,741
NOTES RECEIVABLE FROM EMPLOYEES [note 3]                                       106,186                   -
CAPITAL ASSETS [note 4]                                                      1,654,419           1,582,768
- ----------------------------------------------------------------------------------------------------------
                                                                            15,159,774          27,299,744
==========================================================================================================

LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities                                     2,079,168           1,035,299
- ----------------------------------------------------------------------------------------------------------
                                                                             2,079,168           1,035,299
DEFERRED LEASE CREDIT                                                          433,766             555,676
- ----------------------------------------------------------------------------------------------------------
                                                                             2,512,934           1,590,975
- ----------------------------------------------------------------------------------------------------------

COMMITMENTS AND CONTINGENCIES [notes 7, 10 and 11]

SHAREHOLDERS' EQUITY
Share capital [notes 5 and 11]                                              32,838,364          32,784,364
Accumulated deficit during the development stage                           (20,191,524)         (7,075,595)
- ----------------------------------------------------------------------------------------------------------
                                                                            12,646,840          25,708,769
- ----------------------------------------------------------------------------------------------------------
                                                                            15,159,774          27,299,744
==========================================================================================================
</TABLE>


See accompanying notes

On behalf of the Board:


                                 "Antoine A. Noujaim"        "Richard E. Bagley"
                                 Director                    Director


                                       F-3
<PAGE>   66
ALTAREX CORP.


                       CONSOLIDATED STATEMENTS OF LOSS AND
                               ACCUMULATED DEFICIT

<TABLE>
<CAPTION>
                                                                         YEARS ENDED                         DEC. 1, 1995
                                                                          DECEMBER 31,                        - DEC. 31,
                                                    ---------------------------------------------------
                                                              1998             1997              1996            1998
(In Canadian dollars)                                           $                $                $                $
- -------------------------------------------------------------------------------------- ---------------------------------
REVENUES
<S>                                                       <C>             <C>               <C>             <C>
Research contracts [note 7]                                    50,000          680,000           15,000          745,000
Sale of research materials                                          -           39,760            8,589           71,869
Interest income                                               963,742          900,076           64,668        1,928,486
- -------------------------------------------------------------------------------------- ---------------------------------
                                                            1,013,742        1,619,836           88,257        2,745,355
- -------------------------------------------------------------------------------------- ---------------------------------

EXPENSES
Research and development [note 7]                           9,433,681        4,733,918        1,720,031       16,095,431
General and administrative                                  4,695,990        1,563,555          540,285        6,841,448
- -------------------------------------------------------------------------------------- ---------------------------------
                                                           14,129,671        6,297,473        2,260,316       22,936,879
- -------------------------------------------------------------------------------------- ---------------------------------

NET LOSS FOR THE YEAR                                     (13,115,929)      (4,677,637)      (2,172,059)     (20,191,524)
Accumulated deficit, beginning of year                     (7,075,595)      (2,397,958)        (225,899)
- -------------------------------------------------------------------------------------- ---------------------------------
Accumulated deficit, end of year                          (20,191,524)      (7,075,595)      (2,397,958)     (20,191,524)
====================================================================================== =================================

Net loss per common share                                      ($0.79)          ($0.29)          ($0.24)
- -------------------------------------------------------------------------------------- ----------------

 Weighted-average number of common shares                  16,503,764       15,894,880        9,067,374
====================================================================================== ================     
</TABLE>



See accompanying notes


                                       F-4
<PAGE>   67
ALTAREX CORP.


                      CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                           YEARS ENDED                   DEC. 1, 1995
                                                                          DECEMBER 31,                     - DEC. 31,
                                                          ---------------------------------------------
                                                                1998           1997          1996            1998
(In Canadian dollars)                                            $              $              $               $
- ------------------------------------------------------------------------------------------------------------------------

CASH USED IN OPERATING ACTIVITIES
<S>                                                            <C>            <C>            <C>             <C>
Net loss                                                       (13,115,929)   (4,677,637)    (2,172,059)     (20,191,524)
Adjustments to reconcile net loss to net
  cash used in operating activities:
  Depreciation and amortization                                    548,687       366,268        127,816        1,052,488
  Amortization of deferred lease credit                           (168,551)      (64,324)             -         (232,875)
  Interest expense satisfied through
  issuance of common shares                                              -             -         12,066           12,066
Net changes in non-cash working capital
  balances                                                       1,301,468       374,431       (163,546)       1,621,897
- ------------------------------------------------------------------------------------------------------------------------
                                                               (11,434,325)   (4,001,262)    (2,195,723)     (17,737,948)
- ------------------------------------------------------------------------------------------------------------------------

CASH USED IN INVESTING ACTIVITIES
Purchase of capital assets                                        (620,339)   (1,473,826)       (45,473)      (2,706,908)
Acquisition of AltaRex Corp.                                             -             -        (30,250)         (30,250)
- ------------------------------------------------------------------------------------------------------------------------
                                                                  (620,339)   (1,473,826)       (75,723)      (2,737,158)
- ------------------------------------------------------------------------------------------------------------------------

CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES
Issue of common shares, net [note 6]                                54,000     2,860,273     25,391,601       29,305,874
Issue of Private Placement Units, net [note 6]                           -             -      2,340,674        2,340,674
Issues of Special Warrants, net [note 6]                                 -             -      1,210,000        1,210,000
Share subscription receivable                                            -             -        293,963                -
Deferred lease credit                                               46,641       620,000              -          666,641
Deferred finance costs                                            (118,477)            -              -         (118,477)
Employee relocation loans                                         (106,186)            -              -         (106,186)
Net changes in non-cash financing balances                                      (219,028)       219,028
- ------------------------------------------------------------------------------------------------------------------------
                                                                  (124,022)    3,261,245     29,455,266       33,298,526
- ------------------------------------------------------------------------------------------------------------------------
NET INCREASE (DECREASE) IN CASH AND
  SHORT-TERM INVESTMENTS                                       (12,178,686)   (2,213,843)    27,183,820       12,823,420
Cash and short-term investments, beginning of
 year                                                           25,002,106    27,215,949         32,129                -
- ------------------------------------------------------------------------------------------------------------------------
CASH AND SHORT-TERM INVESTMENTS,
END OF YEAR                                                     12,823,420    25,002,106     27,215,949       12,823,420
========================================================================================================================
</TABLE>

See accompanying notes

                                       F-5
<PAGE>   68
ALTAREX CORP.

                                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)



1.       BASIS OF PRESENTATION

DESCRIPTION OF BUSINESS

The Company, amalgamated under the Business Corporations Act (Alberta), is a
biotechnology company that is engaged in the research and development of
biopharmaceutical products for the therapy of cancer. The Company is in its
development stage.

The Company's ability to complete its research and development program and
commercialize its technology is dependent on the Company continuing to arrange
the necessary financing and the receipt of regulatory approvals to use its
products in the therapy of cancer.

ACQUISITION OF ALTAREX INC.

Effective July 17, 1996, AltaRex Corp. (formerly known as Allrich Energy Group
Inc.) acquired 100% of the issued and outstanding common shares of AltaRex Inc.
by issuing a total of 7,525,000 of AltaRex Corp.'s common shares. At the date of
acquisition, AltaRex Corp. was a non-operating company with net monetary
liabilities totalling $30,250, which amount approximated their net fair value.
AltaRex Inc. was incorporated on October 31, 1995 and commenced active
operations on December 1, 1995. By this transaction, sufficient common shares of
AltaRex Corp. were issued so that a controlling interest (approximately 74%) of
the corporate group passed to the former shareholders of AltaRex Inc.
Accordingly, for accounting purposes, AltaRex Inc. was treated as the purchaser,
and the acquisition was accounted for as a reverse take-over. The legal parent
company, AltaRex Corp., is deemed to be a continuation of AltaRex Inc., and
accordingly, these financial statements are a continuation of the financial
statements of AltaRex Inc., the legal subsidiary, and not the legal parent. In
these financial statements, the 1996 comparative figures presented are those of
AltaRex Inc. In making the acquisition, AltaRex Inc. acquired net liabilities of
approximately $30,250 which amount has been charged to share issue costs. The
acquisition has been accounted for using the purchase method with the cost of
the purchase being a nominal $1.

AMALGAMATION OF ALTAREX CORP. AND ALTAREX INC.

Effective May 31, 1997, AltaRex Corp. amalgamated with its wholly-owned
subsidiary, AltaRex Inc., to continue operations as AltaRex Corp. For accounting
purposes, the amalgamation has been accounted for based on the carrying amounts
of the assets and liabilities of AltaRex Corp. and AltaRex Inc. prior to the
amalgamation.


                                       F-6
<PAGE>   69
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


2.       SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

The financial statements have been prepared by management in accordance with
accounting principles generally accepted in Canada, which do not differ
materially from those established in the United States, except as disclosed in
Note 8. The preparation of financial statements in conformity with such
principles requires management to make estimates and assumptions that affect the
reported assets and liabilities and disclosure of contingent assets and
liabilities at the date of the financial statements and the reported amounts of
revenue and expenses during the reporting periods. Actual results could differ
from those estimates.

CONSOLIDATION OF SUBSIDIARIES

The consolidated financial statements include the accounts of the Company and
its wholly-owned subsidiary, AltaRex US, Corp.

REVENUE RECOGNITION

Research material sales are recognized as materials are delivered.

Revenue from research contracts, which includes government funding of research
projects, is recognized as the services are performed based on costs incurred
or, for those contracts that provide for milestone payments, as milestones are
achieved. Amounts received under refundable research contracts are recorded as
revenue when repayment is conditional on the commercial success of the research
effort. Amounts received in advance of services to be performed are recorded as
unearned revenue.

CASH AND SHORT-TERM INVESTMENTS

The Company invests its surplus cash in highly liquid government and commercial
instruments with maturities not exceeding one year. The carrying cost of
short-term investments approximates their fair value. The short-term investments
held at December 31, 1998 have maturity periods averaging 2.5 months (1997 - 5
months) and average interest rates approximating 5.1% (1997 - 3.9%).


                                       F-7
<PAGE>   70
ALTAREX CORP.

                                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)



2.       SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

DEPOSITS AND OTHER ASSETS

Deposits and down payments on service contracts are deferred and expensed as
services are provided under the terms of the contract.

Included in deposits and other assets are amounts paid on deposit to an
underwriter in anticipation of a financing transaction and have been deferred
pending completion of a transaction. In the event of successful completion of
the financing these costs will be charged to capital. In the event the financing
is unsuccessful these costs will be expensed.

CAPITAL ASSETS

Capital assets are stated at cost net of investment tax credits, accumulated
amortization and depreciation. Depreciation and amortization is provided at
rates which are designed to allocate the cost of the assets, on a straight-line
basis, over their estimated useful lives as follows:

          Scientific equipment                        5 years
          Computer software and equipment             3 years
          Office equipment                            5 years
          Leasehold improvements                      3-5 years, term of lease

DEFERRED LEASE CREDIT

The deferred lease credit relates to leasehold improvements provided to the
Company by the landlord for its leased office and research facilities. The
deferred lease credit is being amortized over the term of the lease agreements
which is three to five years (see note 7).

RESEARCH AND DEVELOPMENT COSTS

Research costs are expensed in the period incurred. Development costs are
expensed in the period incurred unless the Company believes a development
project meets generally accepted accounting principles for deferral and
amortization. No development costs have been deferred to date.

FOREIGN CURRENCY TRANSLATION

Monetary assets and liabilities in foreign currencies are translated into
Canadian dollars at the rate of exchange at the period end; transactions during
the period are translated at the rate of exchange in

                                       F-8
<PAGE>   71
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


2.       SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)



effect at the date of the transaction. Gains and losses arising from these
translation adjustments are included in income.

INVESTMENT TAX CREDITS

The Company is permitted to offset federal income taxes payable with unapplied
investment tax credits which are based on the cost of carrying on qualifying
research and development activities and the cost of qualifying new equipment
(see note 6).

Refundable investment tax credits received by the Company relating to the
acquisition of assets are deducted from the cost of the related asset.
Refundable investment tax credits received by the Company relating to current
expenses are included in the determination of net income as a reduction of
research and development costs.

INCOME TAXES

Income taxes have been provided on a deferred tax allocation basis whereby the
provision for income taxes is determined on the basis of income and expenses
included on the statement of income rather than the related amounts reported in
the income tax returns of the Company. Deferred income taxes relate primarily to
differences between the amount of depreciation and amortization recorded for
accounting purposes and capital cost allowance claimed for income tax purposes.

LOSS PER SHARE

In accordance with generally accepted accounting principles in Canada applicable
to reverse takeovers, the loss per share figures are calculated on the following
basis:

         -        The number of shares outstanding from the beginning of the
                  fiscal period to the date of the reverse take-over on July 17,
                  1996 are deemed to be the number of shares issued by AltaRex
                  Corp. to AltaRex Inc.

         -        The number of shares outstanding from the date of the reverse
                  take-over to the end of each of the fiscal periods are deemed
                  to be the actual number of shares of AltaRex Corp. outstanding
                  in each period.


                                      F-9
<PAGE>   72
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)

2.       SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

The loss per share figure is calculated on the weighted-average number of shares
outstanding based on the numbers determined above, including shares held in
escrow.

3.       NOTES RECEIVABLE

The note receivable balance is comprised of employee relocation loans. The notes
are unsecured, non-interest bearing (except on default of repayment),
denominated in U.S. dollars and have maturity dates ranging from May 2000 to
June 2003.

4.       CAPITAL ASSETS

<TABLE>
<CAPTION>
                                                                 1998                                1997
                                                       --------------------------------------------------------------
                                                                      ACCUMULATED                        ACCUMULATED
                                                       COST          AMORTIZATION          COST          AMORTIZATION
                                                        $                  $                $                 $
- ------------------------------------------------ ---------------- ------------------- --------------  ------------------
<S>                                                     <C>                 <C>            <C>                   <C>
Scientific equipment                                    1,187,996             543,893        954,565             306,144
Computer software and equipment                           301,968             150,688        174,658              74,763
Office equipment                                          416,559             117,151        244,346              50,820
Leasehold improvements                                    781,041             221,413        713,000              72,074
- ------------------------------------------------ ---------------- ------------------- --------------  ------------------
                                                        2,687,564           1,033,145      2,086,569             503,801
- ------------------------------------------------ ---------------- ------------------- --------------  ------------------
Net Book value                                                1,654,419                           1,582,768
- ------------------------------------------------ ---------------- ------------------- --------------  ------------------
</TABLE>

5.       SHARE CAPITAL

AUTHORIZED

The authorized share capital of the Company consists of an unlimited number of
common shares and an unlimited number of preferred shares.


                                      F-10
<PAGE>   73
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)



5.       SHARE CAPITAL (CONTINUED)

The preferred shares may be issued in one or more series and the directors are
authorized to fix the number of shares in each series and to determine the
designation, rights, privileges, restrictions and conditions attached to the
shares of each series.



                                      F-11
<PAGE>   74
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


5.       SHARE CAPITAL (CONTINUED)

ISSUED AND OUTSTANDING COMMON SHARES

Summarized below is the issued and outstanding common shares of AltaRex Corp.:

<TABLE>
<CAPTION>
                                                                                                               SHARE
                                                                                     NUMBER OF                CAPITAL
                                                                                       SHARES                     $
- ----------------------------------------------------------------------------------------------------------------------
<S>                                                                            <C>                    <C>
BALANCE AS AT DECEMBER 1, 1995                                                        1,169,330
  Issue of shares                                                                        25,000
  Initial capitalization of Company                                                                          1,000,000
- ----------------------------------------------------------------------------------------------------------------------
BALANCE AT DECEMBER 31, 1995                                                          1,194,330              1,000,000
  Private placement of shares of AltaRex Inc                                                                   175,200
  Issue of shares of AltaRex Inc. in settlement of interest                                                     12,066
  Shares issued in private placement of unit sales                                    1,497,500              2,310,424
  Shares issued to acquire AltaRex Inc.                                               7,525,000                      1
  Issue of shares for cash from exercise of Special Warrants                            797,500              1,210,000
  Shares issued for cash in public offering                                           4,100,000             25,036,466
  Issue of shares resulting from exercise of stock options                              116,933                 76,014
  Issue of shares resulting from exercise of Warrants                                    43,300                103,920
- ----------------------------------------------------------------------------------------------------------------------
BALANCE AS AT DECEMBER 31, 1996                                                      15,274,563             29,924,091
  Issue of shares resulting from exercise of stock options, net                          95,000                170,931
  Issue of shares resulting from exercise of Warrants                                 1,113,050              2,689,342
- ----------------------------------------------------------------------------------------------------------------------
BALANCE AT DECEMBER 31, 1997                                                         16,482,613             32,784,364
  Issues of shares resulting from exercise of stock options                              30,000                 54,000
- ----------------------------------------------------------------------------------------------------------------------
BALANCE AT DECEMBER 31, 1998                                                         16,512,613             32,838,364
======================================================================================================================
</TABLE>


Effective November 28, 1996, the shareholders approved a consolidation of the
Company's common shares, on the basis of one new common share for every four
existing common shares. These financial statements reflect the share
consolidation for all periods presented.

On July 17, 1996, the Company issued 1,497,500 common shares on the exercise of
Private Placement Units ("Units"). The Units were issued for gross proceeds of
$2,695,500 inclusive of Units issued for $175,000 in commission charges. The
Units consisted of 1,497,500 common shares and common share purchase warrants
("Warrants") that were exercisable into 1,497,500 common shares.


                                      F-12
<PAGE>   75
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


5.       SHARE CAPITAL (CONTINUED)

Also on July 17, 1996 Special Warrants were issued for gross proceeds of
$1,435,500 inclusive of Special Warrants issued for $130,500 in commission
charges. The Special Warrants consisted of 797,500 common shares and Warrants
that were exercisable into 797,500 common shares. On November 18, 1996 a total
of 797,500 common shares were issued on the exercise of Special Warrants.

As additional consideration for the services rendered by the underwriter related
to the Special Warrant issuance, a compensation option was granted. The
compensation option consisted of optioned units that if exercised would have
resulted in the issuance of 72,500 common shares and warrants that would have
been exercisable into 72,500 common shares.

On July 17, 1998 the right to exercise the outstanding Warrants and compensation
option related to the issuance of Units and Special Warrants expired.

On December 20, 1996, the Company issued 4,100,000 common shares in a public
offering for net proceeds of $25,036,466, after related issue expenses of
$2,638,534.

As at December 31, 1998, a total of 2,649,552 (December 31, 1997 - 5,260,994)
common shares of the Company are being held in escrow for regulatory purposes
and released on the following basis:

- -        An amount of 2,434,773 (December 31, 1997 - 4,831,440) common shares
         will be released from escrow on a basis pro rata to each shareholder,
         of one common share for each $1.20 of gross research and development
         costs incurred by the Company to a maximum in any one year of 2,396,667
         common shares. A total of 2,396,667 common shares were released in
         1998.

- -        An additional 214,779 (December 31, 1997 - 429,554) common shares will
         be released from escrow on a basis pro rata to each shareholder on July
         17, 1999. A total of 214,775 common shares were released on July 15,
         1998.

WARRANTS AND STOCK OPTION PLAN (see note 11)

In 1998, the Company amended its stock option plan for directors, officers,
employees and consultants. Pursuant to the amended plan, a total of 2,480,000
(December 31, 1997 - 1,544,206) common shares of the Company are reserved for
issue of stock options, of which 209,251 (December 31, 1997 - 565,373) are
available for grant at December 31, 1998. At December 31, 1998, there were
2,114,083 (December 31, 1997 - 683,833) stock options outstanding for directors,
officers and employees and 156,666 (December 31, 1997 - 295,000) options for
consultants.


                                      F-13
<PAGE>   76
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)



5.       SHARE CAPITAL (CONTINUED)

The following schedule details the warrants and stock options granted,
exercised, expired and cancelled since December 1, 1995.

<TABLE>
<CAPTION>
                                                                       SHARES ISSUABLE ON
                                                                            EXERCISE OF
                                                                                                       EXERCISE PRICE
                                                                    STOCK             WARRANTS           PER SHARE
                                                                   OPTIONS                                   $
- -----------------------------------------------------------  ------------------- ------------------ --------------------
<S>                                                                <C>                <C>              <C>
BALANCE AT DECEMBER 1 AND                                                    Nil                Nil
DECEMBER 31, 1995
         Granted                                                         858,500          2,440,000          1.80 - 3.00
         Exercised                                                                         (43,300)          2.40 - 3.00
- -----------------------------------------------------------  ------------------- ------------------ --------------------
BALANCE AT DECEMBER 31, 1996                                             858,500          2,396,700
         Granted                                                         217,833             41,667         3.30 - 12.00
         Exercised                                                      (95,000)        (1,113,050)          1.80 - 3.00
         Cancelled                                                       (2,500)                                    3.68
- -----------------------------------------------------------  ------------------- ------------------ --------------------
BALANCE AT DECEMBER 31, 1997                                             978,833          1,325,317
         Granted                                                       1,723,666                             0.53 - 3.00
         Exercised                                                      (30,000)                                    1.80
         Cancelled                                                     (401,750)                             1.15 - 5.90
         Expired                                                                        (1,283,650)          1.80 - 3.00
- -----------------------------------------------------------  ------------------- ------------------ --------------------
BALANCE AT DECEMBER 31, 1998                                           2,270,749              41667
===========================================================  =================== ================== ====================
</TABLE>


                                      F-14
<PAGE>   77
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


5.       SHARE CAPITAL (CONTINUED)

The following warrants and stock options to purchase common shares are
outstanding at December 31, 1998.

<TABLE>
<CAPTION>
                    SHARES ISSUABLE ON
                        EXERCISE OF
        STOCK OPTIONS                   WARRANTS                   EXERCISE PRICE
                                                                      PER SHARE                  YEAR OF EXPIRY
                                                                          $
- ----------------------------- ----------------------------- ----------------------------- ----------------------
<S>                                     <C>                        <C>                           <C>
26,666                                                                  0.72                          1999
                                         41,667                         12.00                         2000
522,250                                                                 1.80                          2001
139,500                                                              3.30 - 3.68                      2002
33,333                                                               5.90 - 6.00                      2002
400,000                                                              0.53 - 0.91                      2003
75,000                                                               1.15 - 1.40                      2003
1,074,000                                                            2.18 - 3.00                      2003
- ----------------------------- ----------------------------- ----------------------------- ----------------------
2,270,749                               41,667
============================= ============================= ============================= ======================
</TABLE>




                                      F-15
<PAGE>   78
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


6.       INCOME TAX

The Company is eligible for scientific research and development investment tax
credits which may be applied against federal taxes payable. The accumulated
non-refundable investment tax credits as at December 31, 1998 approximate
$1,923,000 (December 31, 1997 - $1,360,000).

As at December 31, 1998, the Company has scientific research and experimental
development expenditures for tax purposes of approximately $8,146,000 (December
31, 1997 - $5,208,000) which may be carried forward indefinitely and utilized by
reducing income for income tax purposes.

As at December 31, 1998, the Company has approximately $12,984,000 (December 31,
1997 - $2,900,000) of non-capital losses available to be applied to taxable
income of future years. These losses expire between 2001 and 2005.

No recognition has been given in these financial statements to the potential tax
benefits which may result from these carry forward amounts.

7.       COMMITMENTS AND CONTINGENCIES  (SEE NOTE 11)

The Company leases office and research facilities and is committed to annual
minimum basic rent payments as follows:

<TABLE>
<CAPTION>
                                                                     $
- ------------------------------------------------------------------------
<S>                                                               <C>
                            1999                                  279,919
                            2000                                  279,919
                            2001                                  156,077
                            2002                                   52,454
</TABLE>



                                      F-16
<PAGE>   79
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


7.       COMMITMENTS AND CONTINGENCIES (CONTINUED)

On December 1, 1995, in an arm's-length transaction, AltaRex Inc. acquired a
fifteen year exclusive world-wide right and license from Biomira Inc. (the
"Biomira License Agreement") to a certain antibody, its cell bank, related data,
records and proprietary rights (the "Technology") which will be used for the
therapy of cancer, for a non-refundable cash fee of $150,000 which, at the time
of the acquisition, had a director who was also a director of the Company. This
license fee has been charged to research and development expenses. In addition,
certain equipment was purchased for cash of $514,000, an amount approximating
its fair value. The Company also agreed to pay royalties associated with
revenues from the Technology. The Technology agreement requires that the Company
use its best efforts to commercialize the Technology and to commit to spending
certain minimum amounts to develop the Technology. Should these obligations not
be met, the Company's right under the Technology agreement ceases to be
exclusive (see note 11).

The Company is party to a jointly-funded research contract with the
Canada-Israel Industrial Research and Development Foundation. Total funding of
$300,000 is available over a three year term commencing in 1997. During 1997,
$100,000 was received and recorded as revenue. No amounts were received in 1998
and the Company is not currently conducting research pursuant to the contract.
This funding is conditionally repayable, on commercial success, at a rate of
2.5% of gross sales of the resulting products.

The Company is party to an agreement with the Alberta Heritage Foundation for
Medical Research to jointly fund clinical trials, with the Company controlling,
through ownership or licensing, all of the technology. Total funding available
of $500,000 was received and recorded as revenue in 1997. The Company is
required to repay this funding and a royalty equivalent to the amount actually
received, from the commercial success of the resulting products and technology,
at a rate of the lesser of 5% of gross sales or $100,000 per annum. In addition,
the Company granted Warrants in connection with this agreement which entitle the
holder to obtain 41,667 common shares (see note 5).

The Company has contracted certain research projects to a third party consultant
for a three year period ending March 2000. Fees will be paid to the consultant
to a maximum of $300,000 per annum.



                                      F-17
<PAGE>   80
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


8.       RECONCILIATION TO ACCOUNTING PRINCIPLES GENERALLY
         ACCEPTED IN THE UNITED STATES

These financial statements have been prepared in accordance with accounting
principles generally accepted in Canada (Canadian GAAP) which conform in all
material respects to those accounting principles in the United States (U.S.
GAAP), except as follows:

(a)      Cash and short-term investments
         For Canadian GAAP purposes with regard to the statement of cash flows,
         cash and cash equivalents include all short-term investments. For U.S.
         GAAP purposes only those short-term investments with original
         maturities of less than three months would be included in cash and cash
         equivalents. Short-term investments with maturities greater than three
         months amounted to $4,241,732 as at December 31, 1998 ($9,036,000 as at
         December 31, 1997).

         In addition, for Canadian GAAP purposes, the gross amount of non-cash
         items are included in the respective operating, investing, or financing
         activities as applicable. For U.S. GAAP purposes, non-cash items such
         as leasehold improvements financed by the deferred lease credit would
         be excluded from the statements of cash flows. Accordingly, for U.S.
         GAAP purposes for the year ended December 31, 1998 cash used in
         investing activities would decrease by $4,840,909 (1997 - increase by
         $8,416,000), cash provided in financing activities would decrease by
         $46,641 (1997 - $620,000) and cash and cash equivalents would decrease
         by $4,241,732 (1997 - $9,036,000).

(b)      Accounting for income taxes
         For U.S. GAAP purposes, the Company would be required to account for
         income taxes in accordance with the provisions of Statement of
         Financial Accounting Standards No. 109 "Accounting for Income Taxes"
         (SFAS 109). SFAS 109 requires recognition of deferred tax assets and
         liabilities for the expected future tax consequences of events that
         have been included in the financial statements or tax returns. Under
         this method, deferred tax assets and liabilities are determined based
         on the difference between the financial statement and tax bases of
         assets and liabilities using enacted tax rates in effect for the year.
         In addition, for U.S. GAAP purposes, a deferred tax asset, net of a
         valuation allowance, would be recorded to recognize the future benefit
         of loss carryforwards when the realization of the benefit is determined
         to be more likely than not. For Canadian GAAP purposes, the benefits of
         such losses may only be recorded in the period incurred if realization
         is virtually certain. At December 31, 1998, the Company has determined
         that the deferred tax asset net of a valuation allowance of $11,066,000
         (December 31, 1997 - $5,005,000) would be nil (nil at December 31,
         1997).



                                      F-18
<PAGE>   81
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


8.       RECONCILIATION TO ACCOUNTING PRINCIPLES GENERALLY
         ACCEPTED IN THE UNITED STATES (CONTINUED)

(c)      Accounting for stock-based compensation
         For U.S. GAAP purposes, the Company would account for stock-based
         compensation to employees in accordance with Accounting Principles
         Board (APB) Opinion No. 25. For U.S. GAAP purposes, no compensation
         expense would be recognized on the Company's stock options and warrants
         granted, since the exercise price of these instruments equal the fair
         value of the Company's stock as at the date of the grant. Stock-based
         compensation to non-employees would be recorded at the fair value of
         the options and warrants granted. This compensation expense would be
         amortized over the appropriate vesting periods. As at December 31,
         1998, the unamortized compensation benefit that the Company would
         record as additional compensation expense in future periods amounts to
         $89,000 (December 31, 1997 - $181,000).

(d)      Reverse  take-over costs
         For Canadian GAAP purposes, costs incurred in connection with the
         Company's reverse take-over are presented as a charge against
         shareholder's equity. For U.S. GAAP purposes, these costs totalling
         $495,000 would be charged to expense. Accordingly, net loss for the
         year ended December 31, 1996 and share capital for each of the periods
         presented would increase by $495,000.

(e)      Comprehensive income

         For U.S. GAAP purposes, the Company would adopt the disclosure
         requirements of Financial Accounting Standard No. 130 ('SFAS 130').
         SFAS 130 requires the presentation of comprehensive income and its
         components. Comprehensive income includes all changes in equity during
         a period except shareholder transactions. For the periods presented,
         comprehensive income would equal net loss determined for U.S. GAAP
         purposes as set out in the following table.



                                      F-19
<PAGE>   82
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


8.       RECONCILIATION TO ACCOUNTING PRINCIPLES GENERALLY
         ACCEPTED IN THE UNITED STATES (CONTINUED)

The following table reconciles the net loss as reported on the statements of
loss to the net loss that would have been reported had the financial statements
been prepared in accordance with U.S. GAAP.

<TABLE>
<CAPTION>
                                                                       YEARS ENDED                       DEC. 1, 1995
                                                                       DECEMBER 31,                        - DEC. 31,
                                                   ----------------------------------------------------
                                                          1998             1997              1996            1998
                                                           $                 $                $                $
- -------------------------------------------------------------------------------------- ---------------------------------
<S>                                                       <C>              <C>              <C>              <C>
Net loss per Canadian GAAP                                 13,115,929        4,677,637        2,172,059       20,191,524

Adjustment for stock-based compensation                       130,000          163,000           75,000          368,000

Adjustments of reverse take-over costs                                                          495,000          495,000
- -------------------------------------------------------------------------------------- ---------------------------------
Net loss per U.S. GAAP                                     13,245,929        4,840,637        2,742,059       21,054,524
====================================================================================== =================================

Basic and diluted net loss
per share, U.S. GAAP                                           (0.80)           (0.30)           (0.30)
====================================================================================== =================================

Weighted-average number of
common shares                                              16,503,764       15,894,880        9,067,374

Weighted-average number
of common shares and
dilutive share equivalents                                 16,503,764       15,894,880        9,067,374
====================================================================================== =================================
</TABLE>



The following summarizes balance sheet items with material variations under U.S.
GAAP

<TABLE>
<CAPTION>
                                                                                           DECEMBER 31,      DECEMBER 31,
                                                                                                   1998             1997
                                                                                                      $                $
- -------------------------------------------------------------------------------------- ---------------------------------
<S>                                                                                          <C>              <C>
Share capital                                                                                33,701,364       33,517,364
Accumulated deficit                                                                          21,054,524        7,808,595
</TABLE>

                                      F-20
<PAGE>   83
ALTAREX CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


9.       SEGMENTED DISCLOSURE

The Company has considered the reporting requirements of the Canadian Institute
of Chartered Accountants on segment disclosures. The Company has determined that
it manages its operations as one reportable segment of a biotechnology company
engaged in the research and development of biopharmaceutical products for the
therapy of cancer. All of the Company's revenues are generated in Canada. The
Company's capital assets are located in Canada with the exception of $330,000
located in the United States.

10.      UNCERTAINTY DUE TO THE YEAR 2000 ISSUE

The Year 2000 Issue arises because many computerized systems use two digits
rather than four to identify a year. Date-sensitive systems may recognize the
year 2000 as 1900 or some other date, resulting in errors when information using
year 2000 dates is processed. In addition, similar problems may arise in some
systems which use certain dates in 1999 to represent something other than a
date. The effects of the Year 2000 Issue may be experienced before, on, or after
January 1, 2000, and, if not addressed, the impact on operations and financial
reporting may range from minor errors to significant systems failure which could
affect an entity's ability to conduct normal business operations. It is not
possible to be certain that all aspects of the Year 2000 Issue affecting the
entity, including those related to the efforts of customers, suppliers, or other
third parties, will be fully resolved.

11.      SUBSEQUENT EVENTS

(a)      Biomira Licence Agreement

Biomira Inc. has provided the Company with written notice alleging that the
Company is in default of certain reporting obligations under the Biomira License
Agreement and that Biomira Inc. will terminate the agreement on June 1, 1999
unless the alleged defaults are fully cured on or before that date. Biomira had
previously given notice to the Company of the alleged default and that the
agreement would terminate on April 15, 1999. The Company believes that it is
currently in compliance with all of the terms of the Biomira License Agreement
and intends to take such actions as may be necessary to prevent any attempt by
Biomira Inc. to terminate the Biomira License Agreement or in any way limit the
rights of the Company thereunder.

(b)      Biomira Claim

On February 26, 1999, Biomira Inc. commenced legal action against the Company,
the founder of the Company and certain other individuals affiliated with the
Company, claiming ownership of an invention disclosed in a patent application
filed by the Company relating to certain aspects of the


                                      F-21
<PAGE>   84
ALTAREX CORP.

                                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)


Company's core technology, products, processes, and their production. In the
action, Biomira is seeking, among other

11.      SUBSEQUENT EVENTS (CONTINUED)

things, a court order stating that it is the sole owner of the invention and
related intellectual property rights therein, including the patent application,
an injunction prohibiting the Company from using the invention and damages in
the amount of $200,000,000. Although, there can be no assurance that Biomira
will not be successful with its claim, the Company believes that the claim is
without merit. The Company has filed a statement of defense denying the claim.
Given the early stage of the Biomira Claim, it is not possible to estimate the
potential costs and losses, if any, related to this matter.

(c)      Altarex Claim

On March 16, 1999, the Company filed a counterclaim against Biomira Inc. seeking
a declaration of the court that, among other things, (i) Biomira is in breach of
the Biomira License Agreement and the related asset purchase agreement between
the Company, Biomira Inc. and Biomira Research Inc., (ii) the Company has the
exclusive worldwide right and license to use the B43 Technology to develop,
commercialize, manufacture, use and sell products based upon such technology
(including OvaRex(TM) MAb), (iii) the Company has the exclusive right under the
Biomira License Agreement to develop, commercialize, use and sell all AIT(R)
Technology applications, (iv) as a result of its breaches of the Biomira License
Agreement, Biomira Inc. is not entitled to any rights under the Biomira License
Agreement, and (v) the terms of the Biomira License Agreement prohibit Biomira
from bringing the legal action described in the preceding paragraph. In
addition, the Company is seeking an injunction prohibiting Biomira from pursuing
its legal action against the Company and damages in an amount to be proven at
trial. Biomira Inc. has filed a statement of defense denying the counterclaim.
Given the early stage of the Altarex Claim, it is not possible to estimate the
potential costs related to this matter.

(d)      Amendment to stock option plan

On April 9, 1999, the Company's directors approved an amendment to the Company's
stock option plan, subject to shareholder and regulatory approval, by increasing
the number of Common Shares reserved for issuance from 2,480,000 to 4,180,000
and increasing the maximum exercise period for existing and future options from
5 years to 10 years.

(e)      Public offering of Common Shares


                                      F-22
<PAGE>   85
ALTAREX CORP.

                                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


December 31, 1998 and 1997
(In Canadian dollars)

Pursuant to an agency agreement dated April 27, 1999, the Company proposes to
issue up to 34,000,000 Common Shares at $0.50 per share, for gross proceeds of
$17,000,000. The agency fee and other expenses of the issue payable by the
Company are estimated at $1,700,000 and will be deducted from the gross
proceeds. The Company has also agreed to grant the agents options to acquire up
to an aggregate of 5,100,000 additional Common Shares at the offering price to
cover over-allotments.


                                      F-23
<PAGE>   86
                          CERTIFICATE OF ALTAREX CORP.



Dated: April 27, 1999


The foregoing constitutes full, true and plain disclosure of all material facts
relating to the securities offered by this prospectus as required by Part 7 of
the Securities Act (British Columbia), by Part 8 of the Securities Act
(Alberta), by Part VII of The Securities Act (Manitoba) and by Part XV of the
Securities Act (Ontario) and by the respective regulations thereunder. This
prospectus, as required by the Securities Act (Quebec) and the regulations
thereunder, does not contain any misrepresentation that is likely to affect the
value or the market price of the securities to be distributed.





<TABLE>
<S>                                      <C>
     (SIGNED) RICHARD E. BAGLEY                  (SIGNED) EDWARD M. FITZGERALD
President and Chief Executive Officer    Senior Vice President, Chief Financial Officer
                                                          and Secretary
</TABLE>

                       On behalf of the Board of Directors






    (SIGNED) ANTOINE A. NOUJAIM             (SIGNED) WILLIAM R. MCMAHAN
              Director                               Director



                                       80
<PAGE>   87
                              CERTIFICATE OF AGENTS


Dated: April 27, 1999

To the best of our knowledge, information and belief, the foregoing constitutes
full, true and plain disclosure of all material facts relating to the securities
offered by this prospectus as required by Part 7 of the Securities Act (British
Columbia), by Part 8 of the Securities Act (Alberta), by Part VII of The
Securities Act (Manitoba) and by Part XV of the Securities Act (Ontario) and by
the respective regulations thereunder. To our knowledge, this prospectus, as
required by the Securities Act (Quebec) and the regulations thereunder, does not
contain any misrepresentation that is likely to affect the value or the market
price of the securities to be distributed.








FIRST MARATHON SECURITIES LIMITED                   HSBC JAMES CAPEL CANADA INC.




(SIGNED) ANDRE DENIS                                     (SIGNED) ROD N. BAKER






The following includes the name of every person or company having an interest,
either directly or indirectly, to the extent of not less than 5% in the capital
of:

FIRST MARATHON SECURITIES LIMITED: a wholly-owned subsidiary of First Marathon
Inc.; and

HSBC JAMES CAPEL CANADA INC.: a wholly-owned subsidiary of a Canadian chartered
bank.


                                       81


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