AASTROM BIOSCIENCES INC
S-3, 2000-03-21
PHARMACEUTICAL PREPARATIONS
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<PAGE>

     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 21, 2000
                                                    REGISTRATION NO. 333-_______
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM S-3

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                            AASTROM BIOSCIENCES, INC.
             (Exact Name of Registrant as Specified in Its Charter)

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

              MICHIGAN                                       94-3096597
     (State or Other Jurisdiction                         (IRS Employer
  of Incorporation or Organization)                     Identification Number)

                           24 FRANK LLOYD WRIGHT DRIVE
                                  P.O. BOX 376
                            ANN ARBOR, MICHIGAN 48106
                                 (734) 930-5555
          (Address, Including Zip Code, and Telephone Number, Including
             Area Code, of Registrant's Principal Executive Offices)

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

                           R. DOUGLAS ARMSTRONG, PH.D.
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                            AASTROM BIOSCIENCES, INC.
                           24 FRANK LLOYD WRIGHT DRIVE
                                  P.O. BOX 376
                            ANN ARBOR, MICHIGAN 48106
                                 (734) 930-5555
       (Name, Address, Including Zip Code, and Telephone Number, Including
                        Area Code, of Agent for Service)

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

                                   COPIES TO:

                              DOUGLAS J. REIN, ESQ.
                        GRAY CARY WARE & FREIDENRICH LLP
                        4365 EXECUTIVE DRIVE, SUITE 1600
                               SAN DIEGO, CA 92121
                            TELEPHONE: (858) 677-1400
                            FACSIMILE: (858) 677-1477

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

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
                From time to time as described in the Prospectus.

     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [_]

     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [_]

     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]

     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]

     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
=============================================================================================================================
                                                                   PROPOSED               PROPOSED
                                                 AMOUNT             MAXIMUM               MAXIMUM                  AMOUNT OF
             TITLE OF SHARES                     TO BE          AGGREGATE PRICE          AGGREGATE               REGISTRATION
             TO BE REGISTERED                  REGISTERED        PER UNIT (2)        OFFERING PRICE (2)               FEE
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>               <C>                  <C>                        <C>
Common stock ($0 par value)                   4,528,302(1)          $5.9375             $26,886,794                 $7,099
=============================================================================================================================
</TABLE>

(1)  Includes an estimated 2,264,151 shares issuable upon the exercise of
     outstanding warrants. For purposes of estimating the number of shares of
     common stock to be included in this Registration Statement, the Company
     calculated 200% of the number of shares of common stock issuable upon
     exercise of the warrants (based on the current exercise price of $3.695),
     and added 2,264,151 shares of common stock held by the selling stockholder.
     In addition to 4,528,302 shares set forth in the table above, this
     Registration Statement also covers such indeterminate number of additional
     shares as may be held or acquired upon exercise of the warrants as a result
     of any future stock splits, stock dividends or similar transactions covered
     by Rule 416. Aastrom is not relying on Rule 416 to register any additional
     shares issuable or a result of other changes in the exercise price of the
     warrants.

(2)  Estimated, pursuant to Rule 457(c), solely for the purpose of calculating
     the registration fee based on the average of the high and low prices for
     the common stock, as reported on the Nasdaq National Market on March 17,
     2000.

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

================================================================================
<PAGE>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. THE
SELLING HOLDER MAY NOT SELL THESE SECURITIES UNDER THIS PROSPECTUS UNTIL THE
REGISTRATION STATEMENT FILED WITH THE SECURITIES AND EXCHANGE COMMISSION IS
EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER TO SELL NOR DOES IT SEEK AN OFFER TO
BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER AND SALE WOULD NOT BE
PERMITTED.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

                              DATED MARCH __, 2000

PROSPECTUS
- ----------

                        3,396,226 SHARES OF COMMON STOCK

                            AASTROM BIOSCIENCES, INC.

                                   ----------

     This Prospectus relates to the offer and sale of 3,396,226 shares of common
stock being offered by RGC International Investors, LDC. These shares include
1,132,075 shares that are issuable upon exercise of warrants.

     Our common stock is quoted on the Nasdaq National Market under the symbol
"ASTM." The selling stockholder will determine the price it may offer or sell
shares of our common stock independent of Aastrom. On March 17, 2000, the last
sale price of our common stock was $5.8125.


INVESTING IN THE COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD
CONSIDER CAREFULLY THE RISK FACTORS BEGINNING ON PAGE 4 OF THIS PROSPECTUS
BEFORE MAKING A DECISION TO PURCHASE OUR STOCK.

                                   ----------

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

                                   ----------

                 THE DATE OF THIS PROSPECTUS IS MARCH __, 2000.
<PAGE>

================================================================================
You should rely only on the information provided or incorporated by reference in
this prospectus. We have not authorized anyone to provide you with additional or
different information. This document may only be used where it is legal to sell
these securities. You should not assume that any information in this prospectus
is accurate as of any date other than the date of this prospectus.
================================================================================



                                TABLE OF CONTENTS
                                                                     Page
                                                                     ----
        Summary........................................                 3
        Risk Factors...................................                 4
        Where You Can Find More Information............                12
        Selling Shareholder............................                13
        Plan of Distribution...........................                14
        Use of Proceeds................................                16
        Legal Matters..................................                16
        Experts........................................                16

                                       2
<PAGE>

                                     SUMMARY

     Because this is a summary, it does not contain all the information about us
that may be important to you. You should read the more detailed information and
the financial statements and related notes which are incorporated by reference
in this Prospectus.

AASTROM

     Aastrom develops proprietary process technologies and devices for a range
of cell therapy applications. The AastromReplicell(TM) Cell Product System is
our lead product under development, and consists of a clinical cell culture
system that operates single-use therapy kits tailored for patient therapy in the
emerging cell therapy market. We had begun European commercialization of the
AastromReplicell(TM) System for use in stem cell therapy and had started a
pivotal study in the U.S. However, in October 1999 we suspended marketing
efforts in Europe and our U.S. clinical development activities until we obtained
additional funding. With recently received funding, we intend to recommence our
U.S. clinical development program, and are evaluating the possibility of
resuming marketing efforts in Europe.

     We believe that the AastromReplicell(TM) System method will be a
cost-effective, less invasive and less time consuming alternative, or
improvement to, currently available stem cell collection methods and may enhance
the clinical utility of umbilical cord blood transplants by expanding the number
of cells available for transplant. The AastromReplicell(TM) System is designed
as a platform product which implements our pioneering stem cell replication
technology. We believe that the AastromReplicell(TM) System can be modified to
produce a wide variety of other cell types for selected emerging therapies
currently in development.

     Stem cell therapy is a form of cell therapy used to restore blood and
immune system function to cancer patients following chemotherapy or radiation
therapy. Current stem cell collection methods, including bone marrow harvest and
peripheral blood progenitor cell mobilization, can be costly, invasive and
time-consuming for both medical personnel and patients. We believe that the
AastromReplicell(TM) System will offer significant advantages over traditional
stem cell collection methods. The AastromReplicell(TM) System is intended to be
used to produce cells for stem cell therapy from a small starting volume of bone
marrow or umbilical cord blood cells. Further, in an evaluation of seven
tumor-contaminated bone marrow samples that were expanded with the
AastromReplicell(TM) System process, the presence of breast cancer cells in each
sample was either substantially reduced or was no longer detectable. We believe
that the combination of passive tumor cell depletion during culture with the
lower starting volume of cells used for the process may result in a procedure
that offers a tumor-free or tumor-reduced cell product for transplant. Although
we may not market the AastromReplicell(TM) System in the United States for stem
cell therapy unless and until we receive FDA and other necessary regulatory
approvals, we have already completed production-level versions of the
AastromReplicell(TM) System and have obtained permission to affix the CE Mark to
such versions.

     Aastrom's principal executive offices are located at 24 Frank Lloyd Wright
Drive, P. O. Box 376, Ann Arbor, MI 48106. Aastrom's telephone number is (734)
930-5555.

THE OFFERING

Common stock offered by the selling shareholder............  3,396,226 shares

                                       3
<PAGE>

                                  RISK FACTORS

     You should carefully consider the following risk factors before purchasing
our common stock. The risks and uncertainties described below are not the only
ones we face. There may be additional risks and uncertainties that are not known
to us or that we do not consider to be material at this time. If the events
described in these risks occur, our business, financial condition and results of
operations would likely suffer. This prospectus contains forward-looking
statements which involve risks and uncertainties. Aastrom's actual results may
differ significantly from the results discussed in the forward-looking
statements. This section discusses some of the factors that might cause those
differences.


WE CANNOT BE CERTAIN THAT WE WILL BE ABLE TO RAISE THE REQUIRED CAPITAL TO
CONDUCT OUR OPERATIONS AND DEVELOP OUR PRODUCTS.

     We will require substantial capital resources in order to conduct our
operations and develop our products. In October 1999, Aastrom was forced to
reduce operations based on its declining level of capital resources and its
limited financing alternatives available at that time. Although we have started
to restore operating activities, the previous reduction in our operating
activities has negatively affected our ability to develop our products and has
delayed our product development programs. Based on current funding and
anticipated operating activities, we expect that our available cash and expected
interest income will only be sufficient to finance our current activities into
late 2000. This is a forward-looking statement and could be negatively affected
by funding limitations and other factors discussed under this heading. We are
currently pursuing additional sources of financing. If we can not obtain
additional funding prior to that time, Aastrom will be forced to make
substantial reductions in the scope and size of its operations, and may be
forced to curtail activities that we currently plan to resume. In order to grow
and expand our business, and to introduce our product candidates into the
marketplace, Aastrom will need to raise additional funds. We will also need
additional funds or a collaborative partner, or both, to finance the research
and development activities of Aastrom's product candidates for the expansion of
additional cell types.

     Aastrom's future capital requirements will depend upon many factors,
including:

     .    continued scientific progress in its research and development
          programs;

     .    costs and timing of conducting clinical trials and seeking regulatory
          approvals and patent prosecutions;

     .    competing technological and market developments;

     .    the ability of Aastrom to establish additional collaborative
          relationships; and

     .    effective commercialization activities and facility expansions if and
          as required.

Because of our long-term funding requirements, we may attempt to access the
public or private equity markets if and whenever conditions are favorable, even
if we do not have an immediate need for additional capital at that time.
Further, we may enter into financing transactions at rates which are at a
substantial discount to market. Currently we have approximately five million
shares of common stock authorized and available for any financing transactions.
We intend to increase the number of shares of authorized common stock, and will
need stockholder approval to do so. Until such additional shares are duly
authorized, we may be limited in our ability to raise additional funding. This
additional funding may not be available to us on reasonable terms, or at all. If
adequate funds are not available, we may be required to further delay or
terminate research and development programs, curtail capital expenditures, and
reduce business development and other operating activities.

                                       4
<PAGE>

IF WE CANNOT COMPLETE OUR PRODUCT DEVELOPMENT ACTIVITIES SUCCESSFULLY, OUR
ABILITY TO OPERATE OR FINANCE OPERATIONS WILL BE SEVERELY LIMITED.

     Commercialization in the United States of our lead product candidate, the
AastromReplicell(TM) CeLL Production System, will require additional research
and development by Aastrom as well as substantial clinical trials. While we have
commenced initial marketing on a very limited basis of the Aastrom Replicell(TM)
System IN Europe, we believe that the United States will be the principal market
for our products. Aastrom may not be able to successfully complete development
of the AastromReplicell(TM) System or its other product candidates, or
successfully market its technologies or product candidates. Aastrom or its
potential collaborators may encounter problems and delays relating to research
and development, regulatory approval and intellectual property rights of
Aastrom's technologies and product candidates. Aastrom's research and
development programs may not be successful, and its cell culture technologies
and product candidates may not facilitate the ex vivo production of cells with
the expected biological activities in humans. Our technologies and product
candidates may not prove to be safe and efficacious in clinical trials, and we
may not obtain the intended regulatory approvals for our technologies or product
candidates and the cells produced in such products. If any of these events
occur, we may not have adequate resources to continue operations for the period
required to resolve the issue delaying commercialization and we may not be able
to raise capital to finance our continued operation during the period required
for resolution of that issue.


WE MUST SUCCESSFULLY COMPLETE OUR CLINICAL TRIALS TO BE ABLE TO MARKET OUR
PRODUCTS.

     To be able to market products in the United States, Aastrom must
demonstrate, through extensive preclinical studies and clinical trials, the
safety and efficacy of its processes and product candidates, together with the
cells produced by such processes in such products, for application in the
treatment of humans. Aastrom is currently conducting a pivotal clinical trial to
demonstrate the safety and biological activity of patient-derived cells produced
in the AastromReplicell(TM) System. Depending on the availability of resources,
we intend to commence two other pivotal clinical trials to demonstrate the
safety and biological activity of umbilical cord blood cells produced in the
AastromReplicell(TM) System. If our clinical trials are not successful, our
products may not be marketable.

     Our ability to complete our clinical trials in a timely manner depends on
many factors, including the rate of patient enrollment. Patient enrollment can
vary with the size of the patient population, the proximity of suitable patients
to clinical sites, perceptions of the utility of stem cell therapy for the
treatment of certain diseases and the eligibility criteria for the study. We
have experienced delays in patient accrual in our previous and current clinical
trials. If we experience future delays in patient accrual, we could experience
increased costs and delays associated with clinical trials which would impair
our product development programs and our ability to market our products.
Furthermore, the FDA monitors the progress of clinical trials and it may suspend
or terminate clinical trials at any time due to patient safety or other
considerations.


FAILURE TO OBTAIN AND MAINTAIN REQUIRED REGULATORY APPROVALS WOULD SEVERELY
LIMIT OUR ABILITY TO SELL OUR PRODUCTS.

     We must obtain the approval of the U.S. Food and Drug Administration
before commercial sales of our product candidates may commence in the United
States, which we believe will be the principal market for our products. We may
also be required to obtain additional approvals from foreign regulatory
authorities to continue or increase our sales activities in those jurisdictions.
If we cannot demonstrate the safety, reliability and efficacy of our product
candidates, or of the cells produced in such products, we may not be able to
obtain required regulatory approvals. Many of the patients enrolled in the
clinical trials will have previously undergone extensive treatment which will
have substantially weakened the patients and may have irreparably damaged the
ability of their blood and immune systems to recover. Some patients undergoing
the transplant recovery process have died, from causes that were, according to

                                       5
<PAGE>

the physicians involved, unrelated to the AastromReplicell(TM) System procedure,
and it is possible that other patients may die or suffer severe complications
during the course of either the current trials or future trials. In addition,
patients receiving cells produced with Aastrom's technologies and product
candidates may not demonstrate long-term engraftment in a manner comparable to
cells obtained from current stem cell therapy procedures. If we cannot
demonstrate the safety or efficacy of our technologies and product candidates,
including long-term sustained engraftment, or if one or more patients die or
suffer severe complications, the FDA or other regulatory authorities could delay
or withhold regulatory approval of our product candidates.

     Finally, even if we obtain regulatory approval of a product, that approval
may be subject to limitations on the indicated uses for which it may be
marketed. Even after granting regulatory approval, the FDA, other regulatory
agencies, and governments in other countries continue to review and inspect
marketed products, manufacturers and manufacturing facilities. Later discovery
of previously unknown problems with a product, manufacturer or facility may
result in restrictions on the product or manufacturer, including a withdrawal of
the product from the market. Further, governmental regulatory agencies may
establish additional regulations which could prevent or delay regulatory
approval of our products.


EVEN IF WE OBTAIN REGULATORY APPROVALS TO SELL OUR PRODUCTS, LACK OF COMMERCIAL
ACCEPTANCE WOULD IMPAIR OUR BUSINESS.

     Aastrom's product development efforts are primarily directed toward
obtaining regulatory approval to market the AastromReplicell(TM) System as an
alternative to, or as an improvement for, the bone marrow harvest and peripheral
blood progenitor cell stem cell collection methods. These stem cell collection
methods have been widely practiced for a number of years, and Aastrom's
technologies or product candidates may not be accepted by the marketplace as
readily as these or other competing processes and methodologies. Additionally,
our technologies or product candidates may not be employed in all potential
applications being investigated, and any limited applications would limit the
market acceptance of our technologies and product candidates and our potential
revenues. As a result, even if we obtain all required regulatory approvals, we
cannot be certain that our products and processes will be adopted at a level
that would allow us to operate profitably.


FAILURE OF THIRD PARTIES TO MANUFACTURE COMPONENT PARTS OR PROVIDE LIMITED
SOURCE SUPPLIES WOULD IMPAIR OUR NEW PRODUCT DEVELOPMENT AND OUR SALES
ACTIVITIES.

     Aastrom relies solely on third parties to manufacture its product
candidates and their component parts. Aastrom also relies solely on third party
suppliers to provide necessary key mechanical components, as well as growth
factors and other materials used in the cell expansion process. We would not be
able to obtain alternate sources of supply for many of these items on a
short-term basis. If any of our key manufacturers or suppliers fail to perform
their respective obligations or if our supply of growth factors, components or
other materials is limited or interrupted, we would not be able to conduct
clinical trials or market our product candidates on a timely and
cost-competitive basis, if at all.

     Furthermore, some of the compounds used by Aastrom in its current stem
cell expansion processes involve the use of animal-derived products. Suppliers
or regulatory authorities may limit or restrict the availability of such
compounds for clinical and commercial use. Any restrictions on these compounds
would impose a potential competitive disadvantage for Aastrom's products. If
Aastrom was not able to develop or obtain alternative compounds, its product
development and commercialization efforts would be harmed.

                                       6
<PAGE>

     Finally, we may not be able to continue our present arrangements with our
suppliers, supplement existing relationships, establish new relationships or be
able to identify and obtain the ancillary materials that are necessary to
develop our product candidates in the future. Our dependence upon third parties
for the supply and manufacture of these items could adversely affect our ability
to develop and deliver commercially feasible products on a timely and
competitive basis.

OUR PAST LOSSES AND EXPECTED FUTURE LOSSES CAST DOUBT ON OUR ABILITY TO OPERATE
PROFITABLY.

     Aastrom was incorporated in 1989 and has experienced substantial
operating losses since inception. As of December 31, 1999, Aastrom has incurred
net operating losses totaling approximately $75.2 million. These losses have
resulted principally from costs incurred in the research and development of
Aastrom's cell culture technologies and the AastromReplicell(TM) System, general
and administrative expenses, and the prosecution of patent applications. Aastrom
expects to incur significant operating losses until product sales increase,
primarily owing to its research and development programs, including preclinical
studies and clinical trials, and the establishment of marketing and distribution
capabilities necessary to support commercialization efforts for its products.
Aastrom cannot predict with any certainty the amount of future losses. Aastrom's
ability to achieve profitability will depend, among other things, on
successfully completing the development of its product candidates, obtaining
regulatory approvals, establishing manufacturing, sales and marketing
arrangements with third parties, and raising sufficient funds to finance its
activities. Aastrom may not be able to achieve or sustain profitability.


GIVEN OUR LIMITED INTERNAL SALES AND MARKETING CAPABILITIES, WE NEED TO DEVELOP
COLLABORATIVE RELATIONSHIPS TO SELL, MARKET AND DISTRIBUTE OUR PRODUCTS.

     While we have commenced initial marketing on a limited basis of the
AastromReplicell(TM) System in Europe, we have only limited internal sales,
marketing and distribution capabilities. We intend to market our products
through collaborative relationships with companies for sales, marketing and
distribution capabilities. If we cannot develop and maintain those
relationships, we would have only limited abilities to market, sell and
distribute our products. Even if we are able to enter into those relationships,
they may not succeed or be sustained on a long-term basis, and termination would
require us to develop alternate arrangements at a time when we need sales,
marketing or distribution capabilities to meet existing demand. For example, in
November 1998 Aastrom and COBE BCT terminated their strategic alliance for the
worldwide distribution of the AastromReplicell(TM) System for stem cell therapy
and related uses and Aastrom is seeking to enter into other arrangements
relating to the development and marketing of our product candidates.


ANY CHANGES IN THE GOVERNMENTAL REGULATORY CLASSIFICATIONS OF OUR PRODUCTS COULD
PREVENT, LIMIT OR DELAY OUR ABILITY TO MARKET OR DEVELOP OUR PRODUCTS.

     The FDA establishes regulatory requirements based on the classification of
a product. Although the FDA has indicated it intends to regulate the
AastromReplicell(TM) System for stem cell therapy as a Class III medical device,
the FDA may ultimately choose to regulate the AastromReplicell(TM) System under
another category. Because our product development programs are designed to
satisfy the standards applicable to Class III medical devices, a change in the
regulatory classification would affect our ability to obtain FDA approval of our
products. Also, the FDA is in the process of developing its requirements with
respect to somatic cell therapy and gene cell therapy products. Until the FDA
issues definitive regulations covering our product candidates, the regulatory
guidelines or requirements for approval of such product candidates will continue
to be uncertain.

                                       7
<PAGE>

IF WE DO NOT KEEP PACE WITH OUR COMPETITORS AND WITH TECHNOLOGICAL AND MARKET
CHANGES, OUR PRODUCTS MAY BECOME OBSOLETE AND OUR BUSINESS MAY SUFFER.

     The market for our product is very competitive and is subject to rapid
technological changes. Many of Aastrom's competitors have significantly greater
resources, more product candidates and have developed product candidates and
processes that directly compete with Aastrom's products. Aastrom's competitors
may have developed, or could in the future develop, new technologies that
compete with our products or even render our products obsolete. In addition,
some recently published studies have suggested that stem cell therapy, which is
the current principal market for our products, may have limited clinical benefit
in the treatment of breast cancer, which is a significant portion of the current
overall stem cell transplant market. Our products are designed to improve upon
traditional stem cell collection methods, but even if we are able to demonstrate
improved or equivalent results, practitioners may not switch to our new
processes. Given the experience and expertise associated with traditional
methods, if we cannot develop our cell production procedure to lead to a less
expensive and quicker recovery time than seen with the traditional methods, we
will suffer a competitive disadvantage. Finally, to the extent that others
develop new technologies that address the diseases and health conditions we have
targeted, our business will suffer.


IF OUR PATENTS AND PROPRIETARY RIGHTS DO NOT PROVIDE SUBSTANTIAL PROTECTION, OUR
BUSINESS AND COMPETITIVE POSITION WILL SUFFER.

     Our success depends in large part on our ability to develop or license and
protect proprietary products and technologies. However, we cannot be assured
that patents will be granted on any of our pending or future patent
applications. We also cannot be assured that the scope of any of our issued
patents will be sufficiently broad to offer meaningful protection. In addition,
our issued patents or patents licensed to us could be successfully challenged,
invalidated or circumvented so that our patent rights would not create an
effective competitive barrier. Furthermore, Aastrom relies on licenses granted
by the University of Michigan for certain of its patent rights. If Aastrom
breaches such agreements or otherwise fails to comply with such agreements, or
if such agreements expire or are otherwise terminated, Aastrom may lose its
rights under the patents held by the University of Michigan. Aastrom also relies
on trade secrets and unpatentable know-how which it seeks to protect, in part,
by confidentiality agreements with its employees, consultants, suppliers and
licensees. These agreements may be breached, and Aastrom might not have adequate
remedies for any breach. If this were to occur, our business and competitive
position would suffer.


INTELLECTUAL PROPERTY LITIGATION COULD HARM OUR BUSINESS.

     Aastrom's success will also depend in part on its ability to develop
commercially viable products without infringing the proprietary rights of
others. Although Aastrom has not been subject to any filed infringement claims,
other patents could exist or could be filed which would prohibit or limit our
ability to market our products or maintain our competitive position. In the
event of an intellectual property dispute, Aastrom may be forced to litigate.
Intellectual property litigation would divert management's attention from
developing our products and would force Aastrom to incur substantial costs
regardless of whether we are successful. An adverse outcome could subject
Aastrom to significant liabilities to third parties, and force Aastrom to
curtail or cease its development and sale of its products and processes.


THE MARKET FOR OUR PRODUCTS WILL BE HEAVILY DEPENDENT ON THIRD PARTY
REIMBURSEMENT POLICIES.

     Aastrom's ability to successfully commercialize its product candidates
will depend on the extent to which government healthcare programs, such as
Medicare and Medicaid, as well as private health

                                       8
<PAGE>

insurers, health maintenance organizations and other third party payors will pay
for our products and related treatments. Reimbursement by third-party payors
depends on a number of factors, including the payor's determination that use of
the product is safe and effective, not experimental or investigational,
medically necessary, appropriate for the specific patient and cost-effective.
Reimbursement in the United States or foreign countries may not be available or
maintained for any of Aastrom's product candidates. If we do not obtain
approvals for adequate third-party reimbursements, we may not be able to
establish or maintain price levels sufficient to realize an appropriate return
on our investment in product development. Any limits on reimbursement available
from third-party payors may reduce the demand for, or negatively affect the
price of, our products.


POTENTIAL PRODUCT LIABILITY CLAIMS COULD EFFECT OUR EARNINGS AND FINANCIAL
CONDITION.

     Aastrom faces an inherent business risk of exposure to product liability
claims in the event that the use of the AastromReplicell(TM) System during
research and development efforts, including clinical trials, or after
commercialization results in adverse effects. As a result, Aastrom may incur
significant product liability exposure, which could exceed existing insurance
coverage. We may not be able to maintain adequate levels of insurance at
reasonable cost and/or reasonable terms. Excessive insurance costs or uninsured
claims would increase our operating loss and affect our financial condition.


IF WE CANNOT ATTRACT AND RETAIN KEY PERSONNEL, OUR BUSINESS WILL SUFFER.

     Our success depends in large part upon our ability to attract and retain
highly qualified scientific and management personnel. We face competition for
such personnel from other companies, research and academic institutions and
other entities. For example, since our initial public offering in February 1997
three of the six executive officers who were with Aastrom at the time have since
left for positions with other organizations and Aastrom has hired two new
executive officers to assume their responsibilities, one of which subsequently
left. Further, in an effort to conserve financial resources, we have been forced
to implement reductions in our work force on two separate occasions. As a result
of these and other factors, we may not be successful in hiring or retaining key
personnel.


THE WARRANTS HAVE THE POTENTIAL FOR SUBSTANTIAL DILUTION.

     The exercise price of the warrants that we issued in February 2000 is
subject to certain reset provisions in the event the price of our common stock
goes down at specified times in the future or if we issue additional securities
at less than the warrant exercise price. If such an adjustment were made to the
exercise price of the warrants, there would also be an increase in the number of
shares that could be issued upon exercise of the warrants. The warrants are
currently exercisable for 1,132,075 shares of common stock. This number of
shares could increase to 2,614,386 shares of common stock and the exercise price
could be reduced to as low as $1.60 per share. Purchasers of common stock could
therefore experience dilution of their investment upon exercise of the warrants.
The warrants are not registered and may be sold only if registered under the
Securities Act or sold in accordance with an applicable exemption from
registration, such as Rule 144.

                                       9
<PAGE>

OUR STOCK PRICE HAS BEEN VOLATILE AND FUTURE SALES OF SUBSTANTIAL NUMBERS OF OUR
SHARES COULD HAVE AN ADVERSE EFFECT ON THE MARKET PRICE OF OUR SHARES.

     The market price of shares of our common stock has been volatile. The price
of our common stock may continue to fluctuate in response to a number of events
and factors, such as:

     .    clinical trial results;

     .    the amount of our cash resources and our ability to obtain additional
          funding;

     .    announcements of research activities, business developments,
          technological innovations or new products

     .    by us or our competitors;

     .    changes in government regulation;

     .    disputes concerning patents or proprietary rights;

     .    changes in our revenues or expense levels;

     .    public concern regarding the safety, efficacy or other aspects of the
          products or methodologies we are developing; and

     .    changes in potential recommendations by securities analysts.

     Any of these events may cause the price of our shares to fall, which
may adversely affect our business and financing opportunities. In addition, the
stock market in general and the market prices for biotechnology companies in
particular have experience significant volatility that often has been unrelated
to the operating performance or financial conditions of such companies. These
broad market and industry fluctuations may adversely affect the trading price of
our shares, regardless of our operating performance or prospects. For example,
within the last year, our stock price has experienced a day where it traded at
approximately twice the previous day's closing price and another day when it
dropped by over 20% from the previous day's closing price.

     In addition, sales, or the possibility of sales, of substantial numbers
of shares of common stock in the public market could adversely affect prevailing
market prices of shares of common stock. Our employees hold a significant number
of options to purchase shares, many of which are presently exercisable.
Employees may exercise their options and sell shares shortly after such options
become exercisable, particularly if they need to raise funds to pay for the
exercise of such options or to satisfy tax liabilities that they may incur in
connection with exercising their options. Additionally, beginning January 1,
2001, COBE BCT will be able to sell all of its approximately 2.4 million shares
of our common stock without restriction.


OUR CORPORATE DOCUMENTS AND MICHIGAN LAW CONTAIN PROVISIONS THAT MAY MAKE IT
MORE DIFFICULT FOR US TO BE ACQUIRED.

     Our board of directors has the authority, without shareholder approval, to
issue additional shares of preferred stock and to fix the rights, preferences,
privileges and restrictions of these shares without any further vote or action
by our shareholders. This authority, together with certain provisions of our
charter documents, may have the effect of making it more difficult for a third
party to acquire, or of discouraging a third party from attempting to acquire,
control of our company. This effect could occur even if our shareholders
consider the change in control to be in their best interest.


WE MAY BE REQUIRED TO REDEEM A PORTION OF OUR SHARES, WHICH WOULD SIGNIFICANTLY
REDUCE OUR LIMITED CASH RESOURCES.

     The original purchasers of the Shares and warrants may require us to redeem
some or all of those Shares in the event that the Company fails to perform
certain administrative activities that are within its control. These
administrative activities includes: issuing the shares of common stock upon the
exercise of the warrants, transferring or instructing the transfer agent to
transfer shares of common stock issued upon exercise of the warrants when
required and removing any restrictive legends from such shares of common stock
when required. This redemption could significantly reduce our limited capital
resources.

                                       10
<PAGE>

OUR STOCK MAY BE DELISTED FROM NASDAQ, WHICH COULD AFFECT ITS MARKET PRICE AND
LIQUIDITY.

     We are required to meet certain financial tests (including, but not limited
to, a minimum bid price of our common stock of $1.00 and $4 million in tangible
net worth) to maintain the listing of our common stock on the Nasdaq National
Market. Within the last six months, our common stock price has fallen below the
minimum level for some periods and during other periods our tangible net worth
has been below the amount required. In the future, our stock price or tangible
net worth may fall below the Nasdaq requirements, or we may not comply with
other listing requirements, and our common stock might be delisted. If that
happened the market price and liquidity of our common stock would be impaired


ABSENCE OF DIVIDENDS COULD REDUCE OUR ATTRACTIVENESS TO INVESTORS.

     Some investors favor companies that pay dividends, particularly in market
downturns. Aastrom has never paid cash dividends on its common stock and does
not anticipate paying any cash dividends on its common stock in the foreseeable
future. Therefore, your return on this investment will depend on your ability to
sell our stock at a profit.


FORWARD-LOOKING STATEMENTS

     This prospectus contains certain forward-looking statements within the
meaning of Section 27A of the Securities Act and Section 21E of the Securities
Exchange Act. These forward-looking statements include statements regarding:

     .    uncertainties related to potential strategic collaborations with
          others;

     .    future capital needs and uncertainty of additional funding;

     .    uncertainties related to product development and marketability;

     .    uncertainties related to clinical trials;

     .    manufacturing and supply uncertainties and dependence on third
          parties;

     .    anticipation of future losses;

     .    limited sales and marketing capabilities;

     .    uncertainty of regulatory approval and extensive government
          regulation;

     .    competition and technological change;

     .    uncertainty regarding patents and proprietary rights;

     .    no assurance of third party reimbursement;

     .    hazardous materials; and

     .    potential product liability and availability of insurance.

These statements are subject to risks and uncertainties, including those set
forth in this Risk Factors section, and actual results could differ materially
from those expressed or implied in these statements. All forward-looking
statements included in this prospectus are made as of the date hereof. Aastrom
assumes no obligation to update any such forward-looking statement or reason why
actual results might differ.

RECENT DEVELOPMENTS

     As of December 31, 1999 there were 4,000 shares of 1998 Series I
Convertible Preferred Stock and 1,550 shares of 1999 Series III Preferred Stock
outstanding. During January and February 2000, all of those shares of preferred
stock were converted into 7,954,647 shares of common stock. On February 29,
2000, the Company completed the sale of 2,264,151 units, each of which consists
of one share of common stock and a three-year warrant to purchase one-half of
one share of common stock at an initial exercise price of $3.69 per share. On
March 7, 2000, Robert J. Kunze resigned from the Company's Board of Directors.

                                       11
<PAGE>

                       WHERE YOU CAN FIND MORE INFORMATION

     We file annual, quarterly and special reports, proxy statements and other
information with the SEC. You may read and copy any document we file at the
SEC's public reference rooms located at Room 1024, 450 Fifth Street, N.W.,
Washington, D.C. 20549, at The Citicorp Center, 500 West Madison Street, Suite
1400, Chicago, Illinois 60661, and at Seven World Trade Center, Suite 1300, New
York, New York 10048. Please call the SEC at 1-800-SEC-0330 for further
information on the public reference rooms. Our filings with the SEC are also
available to the public on the SEC's Internet web site at http://www.sec.gov.

     The SEC allows us to "incorporate by reference" the information we file
with it, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
considered to be part of this prospectus, and information that we file with the
SEC later will automatically update and supersede the information in this
Prospectus or incorporated by reference. The following documents filed by us and
any future filings made by us with the SEC under Sections 13(a), 13(c) 14 or
15(d) of the Securities Exchange Act of 1934, until the selling shareholder
sells all of the common stock offered hereby, are incorporated by reference in
this Prospectus:

     (a)  the Company's Annual Report on Form 10-K for the year ended June 30,
          1999 (Commission File No.: 000-22025), but specifically excluding The
          Report of the Independent Accountants thereto which is superceded by
          the report included in the Company's current report on Form 8-K filed
          on December 10, 1999 (Commission File No. 000-22025);

     (b)  the Company's Quarterly Report on Form 10-Q for the quarter ended
          September 30, 1999 (Commission File No. 000-22025);

     (c)  the Company's Quarterly Report on Form 10-Q for the quarter ended
          December 31, 1999 (Commission File No. 000-22025);

     (d)  the Company's Current Report of Form 8-K filed with the Commission on
          October 27, 1999 (Commission File No.: 000-22025);

     (e)  the Company's Current Report of Form 8-K filed with the Commission on
          December 10, 1999 (Commission File No.: 000-22025);

     (f)  the Company's Current Report on Form 8-K filed with the Commission on
          January 19, 2000 (Commission File No.: 000-22025);

     (g)  the Company's Current Report on Form 8-K filed with the Commission on
          March 3, 2000 (Commission File No.: 000-22025); and

     (h)  the Company's Registration Statement on Form 8-A filed with the
          Commission on April 11, 1997 (Commission File No.: 000-22025).

     YOU MAY REQUEST A COPY OF THESE FILINGS, AT NO COST, BY WRITING OR
TELEPHONING US AT AASTROM BIOSCIENCES, INC., 24 FRANK LLOYD WRIGHT DRIVE, P.O.
BOX 376, ANN ARBOR, MICHIGAN 48106, TELEPHONE NUMBER (734) 930-5555, ATTENTION:
CHIEF FINANCIAL OFFICER.

                                       12
<PAGE>

                               SELLING SHAREHOLDER

     This prospectus relates to the offering by RGC International Investors, LDC
for resale of up to 3,396,226 shares of common stock. In addition to the
2,264,151 shares of common stock currently owned, the selling shareholder may
acquire 1,132,075 shares upon exercise, from time to time, of the warrants that
it holds. The table below sets forth the following information with respect to
the selling shareholder as of March 1, 2000:

     .    the name and position or other relationship with Aastrom within the
          past three years, if any, of the selling shareholder,

     .    the number of Aastrom's outstanding shares of common stock
          beneficially owned by the selling shareholder (including shares
          obtainable under options exercisable within sixty days of such date)
          prior to the offering hereby,

     .    the number of such shares being offered hereby,

     .    the number and percentage of Aastrom's outstanding shares of common
          stock to be beneficially owned by the selling shareholder after
          completion of the sale of common stock being offered hereby.

     We cannot be sure that the selling shareholder will exercise any of the
warrants or sell any or all of the shares offered hereby.

<TABLE>
<CAPTION>



                                        NUMBER OF SHARES                                                       PERCENTAGE OF
                                       BENEFICIALLY OWNED         NUMBER OF            NUMBER OF SHARES        AASTROM STOCK
                                          PRIOR TO THE           SUCH SHARES          BENEFICIALLY OWNED        OWNED AFTER
SELLING SHAREHOLDER                         OFFERING            BEING OFFERED         AFTER THE OFFERING       THE OFFERING
- -------------------                    ------------------       -------------         ------------------       -------------
<S>                                    <C>                      <C>                   <C>                      <C>
RGC INTERNATIONAL INVESTORS, LDC           3,396,226              3,396,226                    0                     0
</TABLE>


     The number of shares set forth in the table represents an estimate of the
number of shares of common stock to be offered by the selling shareholder. Based
on an exercise price of $3.695 on March 1, 2000, the selling shareholder would
receive 1,132,075 shares of common stock upon exercise of the warrants. If the
warrant exercise price decreases 10% to $3.3255, the number of shares issuable
upon exercise of the warrant would increase to 1,257,672, which would dilute the
ownership interests of existing shareholders by approximately .2%. The actual
number of shares of common stock issuable upon exercise of the warrant is
indeterminate and is subject to adjustment. Therefore, the actual number of
shares could be materially less or more than this estimate depending on several
unpredictable factors,

                                       13
<PAGE>

principally the timing of any future exercises, the market prices of our common
stock shortly before the exercise and financing activities by Aastrom. The
actual number of shares of common stock offered hereby, and included in the
Registration Statement of which this Prospectus is a part, also includes an
additional number of shares of common stock that may be issued or issuable upon
exercise of the warrant by reason of any stock split, stock dividend or similar
transaction involving the common stock, in order to prevent dilution, in
accordance with Rule 416 under the Securities Act.

     The number of shares of common stock set forth above as beneficially
owned by the selling shareholder is based on a warrant exercise price of $3.695.
Pursuant to the warrants, the warrants are exercisable by any holder only to the
extent that the number of shares of common stock owned by such holder and its
affiliates after such conversion or exercise would not exceed 9.9% of the then
outstanding common stock as determined in accordance with Section 13(d) of the
Securities Exchange Act. Accordingly, the number of shares of common stock set
forth in the table for the selling shareholder exceeds the number of shares of
common stock that the selling shareholder could own beneficially at any given
time through its immediate exercise of the warrants. In that regard, beneficial
ownership of the selling shareholder set forth in the table is not determined in
accordance with Rule 13d-3 under the Exchange Act.

     The selling shareholder, RGC International Investors, LDC, is a party
to an investment management agreement with Rose Glen Capital Management, L.P., a
limited partnership of which the general partner is RGC General Partner Corp.
Messrs. Wayne Bloch, Gary Kaminsky and Steve Katznelson own all of the
outstanding capital stock of RGC General Partner Corp., are the sole officers
and directors of RGC General Partner Corp. and are parties to a shareholders'
agreement pursuant to which they collectively control RGC General Partner Corp.
Through RGC General Partner Corp., these individuals control Rose Glen Capital
Management, L.P. These individuals disclaim beneficial ownership of Aastrom's
Common Stock owned by the selling shareholder.


                              PLAN OF DISTRIBUTION

     The shares of common stock may be offered for sale from time to time by or
on behalf of the holder of those shares. The actual number of shares that may be
offered will vary based on the market price of our common stock, and the
3,396,226 shares covered by this prospectus is based on an assumed warrant
exercise price of $3.695. Because the actual number of shares issued upon
exercise of the warrant may vary, we have registered up to 4,528,302 shares
pursuant to a Registration Statement that includes this Prospectus.

     The shares of common stock being offered by the selling shareholder or
its permitted donees, pledgees, transferees, or other successors in interest,
will be sold in one or more transactions (which may involve block transactions)
on the Nasdaq National Market or on such other market on which the common stock
may from time to time be trading:

     .    in privately-negotiated transactions;

     .    through the writing of options on the shares;

     .    short sales; or

     .    any combination of these transactions.

     The shares may also be sold pursuant to Rule 144.

                                       14
<PAGE>

     The sale price may be:

     .    the market price prevailing at the time of sale;

     .    a price related to the prevailing market price; or

     .    such other price as the selling shareholder determines from time to
          time.

The selling shareholder may not accept any purchase offer or make any sale of
shares if it considers the purchase price to be unsatisfactory at any particular
time.

     The selling shareholder or its permitted donees, pledgees, transferees, or
other successors in interest, may also sell the shares directly to market makers
acting as principals and/or broker-dealers acting as agents for themselves or
their customers. Brokers acting as agents for the selling shareholder will
receive usual and customary commissions for brokerage transactions, and market
makers and block purchasers purchasing the shares will do so for their own
account and at their own risk. The selling shareholder may attempt to sell
shares of common stock in block transactions to market makers or other
purchasers at a price per share which may be below the then current market
price. There can be no assurance that all or any of the shares offered hereby
will be issued to, or sold by, the selling shareholder.

     Alternatively, the selling shareholder may sell all or any part of the
shares through an underwriter. The selling shareholder has not entered into any
agreement with a prospective underwriter and may not do so. If the selling
shareholder enters into such an agreement or agreements, Aastrom will supplement
or revise this prospectus.

     The selling shareholder and any other persons participating in a
distribution of the shares will be subject to applicable provisions of the
Securities Exchange Act and the rules and regulations thereunder, including
Regulation M, which may restrict certain activities of, and limit the timing of
purchases and sales of the shares by the selling shareholder and other persons
participating in a distribution of the shares. Furthermore, under Regulation M,
persons engaged in a distribution of the shares are prohibited from
simultaneously engaging in market making and certain other activities with
respect to the shares for a specified period of time prior to the commencement
of such distributions subject to specified exceptions or exemptions. All of the
foregoing may affect the marketability of the shares offered hereby.

     Aastrom has agreed to indemnify the selling shareholder, or certain
transferees or assignees, against certain liabilities, including liabilities
under the Securities Act, or to contribute to payments the selling shareholder,
or certain transferees or assignees, may be required to make in respect thereof.
The selling shareholder has agreed to indemnify Aastrom against certain
liabilities, including liabilities under the Securities Act, or to contribute to
payments Aastrom may be required to make in respect thereof.

                                       15
<PAGE>

                                 USE OF PROCEEDS

     Aastrom will not receive any proceeds from sales of the shares. We will
receive up to approximately $4.2 million upon exercise of the warrants. This is
based on a potential full exercise of the warrants to purchase 1,132,075 shares
of common stock at $3.695 per share. We intend to apply any net proceeds
received from exercise of the warrants to general working capital purposes.


                                  LEGAL MATTERS

     The validity of the common stock offered hereby will be passed upon for
Aastrom by Pepper Hamilton LLP, Detroit, Michigan. Gray Cary Ware & Freidenrich
LLP, San Diego, California, has acted as special counsel to Aastrom in
connection with this offering.


                                     EXPERTS

     The financial statements incorporated in this Prospectus by reference to
the Current Report on Form 8-K filed with the Commission on December 10, 1999,
have been so incorporated in reliance on the report (which contains an
explanatory paragraph relating to the Company's ability to continue as a going
concern and described in Note 1 to the Financial Statements) of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.

                                       16
<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

     Other expenses in connection with the registration of the common stock
hereunder will be substantially as follows (all expenses other than the SEC
Registration Fee are estimates):

                                              Company
            Item                              Expense
            ----                              -------
            SEC Registration Fee ..........   $ 7,099
            Printing and engraving expenses   $ 2,000
            Legal fees and expenses .......   $10,000
            Accounting fees and expenses ..   $ 5,000
            Miscellaneous .................   $ 5,901
                                              -------
                     Total ................   $30,000
                                              =======


ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Sections 1561 through 1565 of the Michigan Business Corporation Act (the
"MBCA") authorize a corporation to grant or a court to award indemnity to
directors, officers, employees and agents in terms sufficiently broad to permit
such indemnification under certain circumstances for liabilities (including
reimbursement for expenses incurred) arising under the Securities Act of 1933.

     The Bylaws of the Registrant, provide that the Registrant shall, to the
fullest extent authorized or permitted by the MBCA, or other applicable law,
indemnify a director or officer who was or is a party or is threatened to be
made a party to any proceeding by or in the right of the Registrant to procure a
judgment in its favor by reason of the fact that such person is or was a
director, officer, employee or agent of the Registrant, against expenses,
including actual and reasonable attorneys' fees, and amounts paid in settlement
incurred in connection with the action or suit, if the indemnitee acted in good
faith and in a manner the person reasonably believed to be in, or not opposed
to, the best interests of the Registrant or its shareholders. This section also
authorizes the Registrant to advance expenses incurred by any agent of the
Registrant in defending any proceeding prior to the final disposition of such
proceeding upon receipt of an undertaking by or on behalf of the agent to repay
such amount unless it shall be determined ultimately that the agent is entitled
to be indemnified.

     The Bylaws also authorize the Registrant to purchase and maintain insurance
on behalf of any person who is or was a director, officer, employee or agent of
the Registrant against any liability asserted against or incurred by such person
in such capacity or arising out of such person's status as such, regardless of
whether the Registrant would have the power to indemnify such person against
such liability under the provisions of the MBCA.

     The Registrant has entered into an indemnification agreement with certain
of its directors, officers and other key personnel, which contains provisions
that may in some respects be broader than the specific indemnification
provisions contained under applicable law. The indemnification agreement

                                       17
<PAGE>

may require the Registrant, among other things, to indemnify such directors,
officers and key personnel against certain liabilities that may arise by reason
of their status or service as directors, officers or employees of the
Registrant, to advance the expenses incurred by such parties as a result of any
threatened claims or proceedings brought against them as to which they could be
indemnified and, to the maximum extent that insurance coverage of such
directors, officers and key employees under the Registrant's directors' and
officers' liability insurance policies is maintained.

     Section 1209 of the MBCA permits a Michigan corporation to include in its
Articles of Incorporation a provision eliminating or limiting a director's
liability to a corporation or its shareholders for monetary damages for breaches
of fiduciary duty. The enabling statute provides, however, that liability for
breaches of the duty of loyalty, acts or omissions not in good faith or
involving intentional misconduct or knowing violation of the law, or the receipt
of improper personal benefits cannot be eliminated or limited in this manner.
The Registrant's Restated Articles of Incorporation include a provision which
eliminates, to the fullest extent permitted by the MBCA, director liability for
monetary damages for breaches of fiduciary duty.


ITEM 16. EXHIBITS.

     EXHIBIT
     NUMBER                 DESCRIPTION OF DOCUMENT
     -------                -----------------------
       4.1*      Restated Articles of Incorporation
       4.2**     Bylaws, as amended
       4.3***    Common Stock Purchase Warrant
       5.1       Consent and Opinion of Pepper Hamilton LLP
      23.1       Consent of PricewaterhouseCoopers LLP, independent accountants
      23.2       Consent of Gray Cary Ware & Freidenrich LLP
      23.3       Consent of Pepper Hamilton LLP (included in Exhibit 5.1)
      24.1       Power of Attorney (see Signature page)
- -----------
*     Incorporated by reference from Aastrom's Quarterly Report of Form 10-Q for
      the quarter ended December 31, 1996.

**    Incorporated by reference from Aastrom's Registration Statement Form S-1
      (No. 333-15415).

***   Incorporated by reference from Aastrom's Current Report on Form 8-K filed
      March 3, 2000.

      A. The undersigned Registrant hereby undertakes:

          (1) To file, during any period in which offers or sales are being
      made, a post-effective amendment to this registration statement:

               (i) To include any prospectus required by section 10(a)(3) of the
          Securities Act of 1933 (the "Securities Act");

               (ii) To reflect in the prospectus any facts or events arising
          after the effective date of the registration statement (or the most
          recent post-effective amendment thereof) which, individually or in the
          aggregate, represent a fundamental change in the information set forth
          in the registration statement. Notwithstanding the foregoing, any
          increase or decrease in volume of securities offered (if the total
          dollar value of securities offered would not exceed that which was
          registered) and any deviation from the low or high end of the
          estimated maximum offering range may be reflected in the form of
          prospectus filed with the Commission pursuant to Rule 424(b) if, in
          the aggregate, the changes in volume and price represent no more than
          a 20% change in the maximum aggregate offering price set forth in the
          "Calculation of Registration Fee" table in the effective registration
          statement;

                                       18
<PAGE>

               (iii) To include any material information with respect to the
          plan of distribution not previously disclosed in the registration
          statement or any material change to such information in the
          registration statement; provided, however, that paragraphs (a)(1)(i)
          and (a)(1)(ii) do not apply if the information required to be included
          in a post-effective amendment by those paragraphs is contained in
          periodic reports filed by the Registrant pursuant to Section 13 or
          Section 15(d) of the Securities Exchange Act of 1934 that are
          incorporated by reference in the registration statement.

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

          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.

     B. The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     C. The undersigned Registrant hereby undertakes to deliver or cause to be
delivered with the prospectus, to each person to whom the prospectus is sent or
given, the latest annual report to security holders that is incorporated by
reference in the prospectus and furnished pursuant to and meeting the
requirements of Rule 14a-3 or Rule 14c-3 under the Securities Exchange Act of
1934; and, where interim financial information required to be presented by
Article 3 of Regulation S-X are not set forth in the prospectus, to deliver, or
cause to be delivered to each person to whom the prospectus is sent or given,
the latest quarterly report that is specifically incorporated by reference in
the prospectus to provide such interim financial information.

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

                                       19
<PAGE>

     E. The undersigned Registrant hereby undertakes that:

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

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

                                       20
<PAGE>

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements of filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized in the City of Ann Arbor, State of Michigan, on March 21, 2000.

                                    AASTROM BIOSCIENCES, INC.

                                    By: /s/ R. Douglas Armstrong, Ph.D.
                                       --------------------------------
                                       R. Douglas Armstrong, Ph.D.
                                       President and Chief Executive Officer
                                       (Principal Executive Officer)


                                POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints R. Douglas Armstrong and Todd E. Simpson,
or either of them, as his or her attorney-in-fact, each with full power of
substitution for him or her in any and all capacities, to sign any and all
amendments to this registration statement, including, but not limited to,
post-effective amendments and any and all new registration statements filed
pursuant to Rule 462 under the Securities Act of 1933 in connection with or
related to the offer contemplated by this registration statement, as amended,
and to file the same, with exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, hereby ratifying and
confirming our signatures as they may be signed by our said attorney to said
registration statement and any and all amendment thereto.

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>

                  Signature                                          Title                                   Date
                  ---------                                          -----                                   ----
<S>                                            <C>                                                      <C>

        /s/ R. Douglas Armstrong               President, Chief Executive Officer and Chairman          March 21, 2000
- ---------------------------------------        of the Board of Directors (Principal Executive
       R. Douglas Armstrong, Ph.D.             Officer)


           /s/ Todd E. Simpson                 Vice President, Finance and Administration, Chief        March 21, 2000
- ---------------------------------------        Financial Officer, Secretary and Treasurer
             Todd E. Simpson                   (Principal Financial and Accounting Officer)


          /s/ Mary L. Campbell                 Director                                                 March 21, 2000
- ---------------------------------------
            Mary L. Campbell

         /s/ Stephen G. Emerson                Director                                                 March 21, 2000
- ---------------------------------------
     Stephen G. Emerson, M.D., Ph.D.

          /s/ Arthur F. Staubitz               Director                                                 March 21, 2000
- ---------------------------------------
           Arthur F. Staubitz


          /s/ Joseph A. Taylor                 Director                                                 March 21, 2000
- ---------------------------------------
            Joseph A. Taylor

</TABLE>

                                       21
<PAGE>

                                INDEX TO EXHIBITS


     EXHIBIT
     NUMBER                 DESCRIPTION OF DOCUMENT
     -------                -----------------------
   4.1*          Restated Articles of Incorporation

   4.2**         Bylaws, as amended

   4.3***        Common Stock Purchase Warrant

   5.1           Consent and Opinion of Pepper Hamilton LLP

  23.1           Consent of PricewaterhouseCoopers LLP, independent accountants

  23.2           Consent of Gray Cary Ware & Freidenrich LLP

  23.3           Consent of Pepper Hamilton LLP (included in Exhibit 5.1)

  24.1           Power of Attorney (see signature page)

- ----------
*     Incorporated by reference from Aastrom's Quarterly Report of Form 10-Q for
      the quarter ended December 31, 1996.

**    Incorporated by reference from Aastrom's Registration Statement Form S-1
      (No. 333-15415).

***   Incorporated by reference from Aastrom's Current Report on Form 8-K filed
      March 3, 2000.

<PAGE>

                                                                     Exhibit 5.1

                                 March 20, 2000


Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, N.W.
Washington, D.C.  20549

      Re:      Aastrom Biosciences, Inc. Registration
               Statement on Form S-3
               File No.: 333-_______________

Gentlemen:

     We have acted as special counsel to Aastrom Biosciences, Inc., a Michigan
corporation (the "Company"), in connection with the preparation and filing with
the Securities and Exchange Commission (the "Commission") of a registration
statement filed with the SEC on March 21, 2000 (the "Registration Statement")
of the Company on Form S-3 under the Securities Act of 1933, as amended (the
"Act"). The Registration Statement relates to the proposed issuance by the
Company of shares of the Company's Common Stock (the "Shares") covered by the
Registration Statement.

     In this connection, we have examined the Registration Statement, including
the exhibits thereto, the originals or copies, certified or otherwise identified
to our satisfaction, of the Articles of Incorporation and the By-Laws of the
Company amended to date, resolutions of the Company's Board of Directors and
such other documents and corporate records relating to the Company, and the
issuance and sale of the Company's common stock and warrants issued in
connection with the sale of such shares (the "Warrants") and the issuance of the
Shares upon exercise of the Warrants, as we have deemed appropriate. The opinion
expressed herein is based exclusively on the applicable provisions of the
Michigan Business Corporation Act as in effect on the date hereof.

     On the basis of the foregoing, we are of the opinion that the Shares,
including those issued upon exercise of the Warrants, will be, duly authorized,
validly issued, fully paid, and non-assessable.

     We hereby consent to the reference to our firm under the caption "Legal
Matters" in the Registration Statement and to the filing of this opinion as an
exhibit to the Registration Statement. Such consent does not constitute a
consent under Section 7 of the Act, since we have not certified any part of such
Registration Statement and do not otherwise come within the categories of
persons whose consent is required under Section 7 of the Act or the rules and
regulations of the Commission promulgated thereunder.


                                    Very truly yours,

                                    PEPPER HAMILTON LLP


                                    By:  /s/ Michael B. Staebler
                                       -------------------------
                                       Michael B. Staebler

<PAGE>

                                                                    Exhibit 23.1



                       CONSENT OF INDEPENDENT ACCOUNTANTS



     We hereby consent to the incorporation by reference in this Registration
Statement on Form S-3 of our report dated December 8, 1999 relating to the
financial statements, which appears in Aastrom Biosciences, Inc.'s Current
Report on Form 8-K dated December 10, 1999. We also consent to the reference to
us under the heading "Experts" in such Registration Statement.




/s/ PriceWaterhouseCoopers
- --------------------------
PRICEWATERHOUSECOOPERS LLP


Minneapolis, Minnesota
March 20, 2000

<PAGE>

                                                                    EXHIBIT 23.2

                    [GRAY CARY WARE & FREIDENRICH LETTERHEAD]



March 21, 2000



Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, N.W.
Washington, D.C.  20549

     Re: Aastrom Biosciences, Inc.
         Registration Statement on Form S-3

Ladies and Gentlemen:

     As counsel to Aastrom Biosciences, Inc., a Michigan corporation (the
Company"), in connection with the proposed offer and sale of those certain
shares of the Company's Common Stock, $0 par value, as set forth in the
Registration Statement on Form S-3 (the "Registration Statement"), we hereby
consent to the use of our name under the caption "Legal Matters" in the
Registration Statement, including the Prospectus constituting a part thereof, as
originally filed or as subsequently amended.

Very truly yours,

/s/ GRAY CARY WARE & FREIDENRICH LLP


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