TEXAS BIOTECHNOLOGY CORP /DE/
10-K, 1997-03-11
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1
                                     PART I


ITEM 1. BUSINESS

    Texas Biotechnology Corporation ("TBC" or the "Company"), a
biopharmaceutical company, applies innovative drug discovery techniques and its
specialized knowledge of the role of vascular cell biology in cardiovascular
disease to the design and development of novel pharmaceutical compounds. The
Company was incorporated in Delaware in August 1989 under the name Cardiology
Institute of Texas, Ltd., and its name was changed to Texas Biotechnology
Corporation in October 1990. As of December 31, 1996, the Company had 73
employees, 60 of whom were engaged in research and development. References to
TBC or the Company include its subsidiary ImmunoPharmaceutics, Inc. ("IPI")
unless otherwise indicated.

                                    OVERVIEW

                                PRODUCT PIPELINE

    TBC's lead product is NOVASTAN(R), one of a new class of direct thrombin
inhibitors. NOVASTAN(R) is being developed for various indications as an
anticoagulant alternative to heparin. Heparin, discovered over 80 years ago,
is used at high intravenous doses in approximately 3 million patients annually
in the United States. Up to 10% of these patients develop a side effect known
as Heparin-Induced Thrombocytopenia ("HIT"), which may lead to potentially life
threatening blood clots. A significant portion, potentially over 50% of HIT
patients progress on to a life-threatening condition, Heparin-Induced
Thrombocytopenia with Thrombosis Syndrome ("HITTS"). The Company has completed
enrollment in a pivotal Phase III clinical trial for NOVASTAN(R) for the
treatment of both HIT and HITTS. The Company has also completed enrollment in
Phase II clinical trials for NOVASTAN(R) for use in the treatment of Acute
Myocardial Infarction ("AMI"). Those trials have been conducted to determine
whether NOVASTAN(R) could be used in combination with thrombolytics such as
tissue-plasminogen activator ("t-PA") or streptokinase ("SK") to treat AMI in
the approximately 250,000 persons who receive thrombolytics annually in the
U.S.

    The Company sublicensed the United States and Canadian rights to
NOVASTAN(R) from Genentech in 1993, which licensed the product from Mitsubishi
as part of a multi-product cross-licensing agreement. The agreement included
the use of NOVASTAN(R) for certain cardiovascular indications and access to an
improved formulation patent granted in 1993 which expires in 2010 and a use
patent which expires in 2009. See "Licenses and Patents". Mitsubishi
currently sells NOVASTAN(R) in Japan for chronic arterial occlusion and stroke,
indications not being developed by TBC.

    TBC's Endothelin Receptor Antagonist Program targets receptors believed to
be associated with vasoconstriction (narrowing of blood vessels). The Company
believes its compounds from this program could have efficacy in treating the
pulmonary hypertension associated with such diseases as Congestive Heart
Failure ("CHF") and Chronic Obstructive Pulmonary Disease ("COPD"). TBC's
scientists have developed a lead compound, TBC 11251, a synthetic small
molecule receptor antagonist that selectively blocks endothelinA receptors.
TBC 11251 entered Phase I clinical trials in 1996 for treatment of congestive
heart failure. An investigational new drug application ("IND") was filed in
early 1997. TBC intends to seek corporate partners for the development of TBC
11251 applications for CHF and COPD.

    There are two Anti-Cell Adhesion programs currently underway that were
initiated and developed by TBC scientists. The first program evaluates the
anti-inflammatory effect of inhibitors of selectins, a family of three
carbohydrate binding proteins. Selectins primarily contribute to acute
inflammatory diseases that result in tissue injury. Using its proprietary drug
design technology, the Company developed TBC 1269, which it is assessing for
the treatment of asthma. TBC 1269 entered Phase I clinical trials in 1996,
with the expectation of filing an IND in March 1997. Selectin inhibitors may
also be effective in the treatment of inflammatory bowel disease and psoriasis;
the Company will likely seek corporate partners to pursue these indications.




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    The Company's second Anti-Cell Adhesion program is based on the adhesion of
leukocytes to vascular cell tissue. There is evidence that Vascular Cell
Adhesion Molecules ("VCAM") at the sites of endothelial injury lead to an
accumulation of Very Late Antigen-4 ("VLA-4") containing macrophages that may
contribute to such inflammatory disorders as atherosclerosis, asthma,
rheumatoid arthritis and multiple sclerosis. The Company is currently
conducting preclinical studies on its VCAM/VLA-4 compounds in the treatment of
asthma and has ongoing research projects evaluating potential efficacy in
multiple sclerosis.

    In collaboration with Synthelabo, TBC is also directing research in
Vascular Proliferative Diseases. Vascular Proliferative Diseases result in the
thickening and narrowing of blood vessels in such disorders as atherosclerosis,
coronary restenosis, vascular graft failure, post-transplant accelerated
atherosclerosis, and hemodialysis shunt failure. TBC's approach is to develop
antagonists against the production of Fibroblast Growth Factor ("FGF"). The
Company expects to begin preclinical studies on an FGF antagonist in 1998; if
successful, TBC plans to evaluate this compound for the treatment of coronary
restenosis.

                                   TECHNOLOGY

    TBC uses a wide variety of technologies to develop pharmaceutical
treatments for cardiovascular diseases. The Company applies its understanding
of vascular biology and advanced drug design techniques to discover novel
therapeutics and to test these therapeutics in-house in in vitro and in vivo
test systems.

    The Company combines three-dimensional computer-aided drug design
techniques with unique chemistry approaches to construct small molecule
therapeutics. TBC believes that small synthetic molecules have significant
advantages over other types of therapeutics such as monoclonal antibodies,
peptides, and recombinant proteins. These advantages include easier synthesis
and production, simpler methods for administration, reduced production cost,
and better patent protection. The drug discovery process at TBC relies upon
its proprietary supercomputational chemistry capabilities (and, if necessary,
related structural science capabilities such as high-field nuclear magnetic
resonance and X-ray crystallography), molecular biology, and medicinal
chemistry, conducted in an integrated effort by TBC's scientific staff. The
core foundation for TBC's peptide- or protein-structure based approach to
rational drug discovery is contained in its proprietary computational chemistry
algorithms resident on in-house computer systems.

                                   THROMBOSIS

                                   BACKGROUND

    The formation of a blood clot, or thrombus, is the end result of a complex
sequence of events. Thrombosis causes different vascular diseases, depending
on the location and type of the vessel in which the clot is lodged. An
arterial clot may lead to heart attack if lodged in a coronary artery, or to
stroke if lodged in an artery that supplies oxygen to the brain. Venous clots
occur principally in the arms or legs (deep vein thrombosis), and may cause
local inflammation, chronic pain and other complications. In some cases, a
venous clot can cause lung injury (pulmonary embolism) by migrating from the
veins to the lungs.

    Thrombosis can be treated surgically or through drug therapy with
anticoagulant and thrombolytic agents. Anticoagulant agents, which prevent
clots from forming, are characterized as either antithrombotic or antiplatelet
agents. Antithrombotic agents block the action of the blood protein thrombin
and may be used to treat both arterial and venous clots. Antiplatelet agents
prevent the ability of platelets to clump together and effectively treat only
arterial clots. Heparin and aspirin are the two most widely-used
antithrombotic and antiplatelet agents, respectively. Thrombolytic drugs
dissolve existing clots in veins or arteries, but do not block the formation of
new blood clots. Tissue plasminogen activator ("t-PA") and streptokinase are
the most commonly used thrombolytic drugs. A combination of an anticoagulant
and a thrombolytic often achieves the best therapeutic effect.

    The only parenteral (injectable) anticoagulant is intravenous heparin,
first discovered over 80 years ago. In the United States, approximately 3
million patients annually receive intravenous heparin at high doses to treat a
variety of conditions that require inhibition of the body's natural clotting
mechanism. Up to 10% of heparin-treated patients





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develop a profound immunological reaction to heparin which is known as
Heparin-Induced Thrombocytopenia ("HIT"); according to recent literature,
approximately 50% of these patients progress to a very serious thrombotic
condition, Heparin-Induced Thrombocytopenia with Thrombosis Syndrome ("HITTS").
HITTS patients suffer from a life-threatening clotting disorder that cannot be
treated with heparin.

                                  TBC PROGRAM

    TBC's lead product, NOVASTAN(R), is a novel, non-protein, synthetic small
molecule thrombin blocker that directly and selectively binds to and
inactivates thrombin in the blood plasma. Small molecule non-protein
therapeutics are generally less costly to produce, easier to administer and
have a longer shelf-life than a protein based therapeutic. Moreover,
NOVASTAN(R) is also effective against thrombin that is bound in blood clots.
TBC is developing NOVASTAN(R) as an anticoagulant alternative to heparin for
the United States and Canadian markets.

    NOVASTAN(R) is manufactured and sold in Japan by Mitsubishi Chemical where
it is approved for the treatment of chronic arterial obstruction, acute
ischemic stroke and antithrombin III deficient patients undergoing
hemodialysis. Since the product introduction in June 1990 in excess of 58,000
patients have been treated with NOVASTAN(R) in Japan. Mitsubishi Chemical
licensed the drug to Genentech for the United States and Canada. Genentech
filed an IND in December 1988, and completed several Phase I clinical studies.
Genentech licensed and sublicensed NOVASTAN(R) related technology to TBC in May
1993.

    The Company has completed enrollment for the NOVASTAN(R) Phase III clinical
trial for the treatment of patients with HIT/HITTS and three Phase II clinical
trials for the treatment of acute myocardial infarction ("AMI). The
compilation and analysis of the data is continuing. Although there can be no
assurance that NOVASTAN(R) will receive required regulatory approvals or be
successfully commercialized, the Company plans to file a New Drug Application
("NDA") for the treatment of HIT/HITTS in mid 1997. This date is contingent
upon various factors, including, trial results, and availability of funds. The
Company is pursuing collaboration opportunities to develop and market
NOVASTAN(R) within its licensed territory.

                             VASOSPASM/HYPERTENSION

                                   BACKGROUND

    Smooth muscle cells in the blood vessel, via a series of biochemical and
morphological events, are responsible directly for mediating changes in vessel
diameter. The regulation of tissue blood flow depends on a delicate balance
between physical and chemical stimuli that cause smooth muscle cells to relax
(vasodilatation) or contract (vasoconstriction). Chronic periods of excessive
vasoconstriction in the peripheral circulation can lead to disturbances in
blood pressure (hypertension) or heart function (congestive heart failure),
whereas acute episodes of intense vasoconstriction (vasospasm) can restrict
blood flow leading to severe tissue damage and loss of function (myocardial
infarction or kidney failure). Vascular endothelium, cells comprising the
innermost lining of all blood vessels, is an essential component of all tissue.
Recently, it has been determined that the vascular endothelium plays a pivotal
role in maintaining normal blood vessel tone by producing substances that cause
vasodilatation and vasoconstriction.

    The endothelins ("ET"s) are a family of three peptides that are believed to
play a critical role in the pathophysiology of cardiac, vascular and renal
diseases. Originally isolated from vascular endothelium, endothelin-1 ("ET-1")
was shown initially to be an extremely potent, naturally occurring
vasoconstrictor substance that stimulates a persistent hypertensive effect.
There is now strong evidence that endothelins are involved in vasospasm,
myocardial infarction, congestive heart failure, renal disease, subarachnoid
hemorrhage, and certain types of hypertension. It has been determined that
this multiplicity of endothelin actions on different cell types can be
explained via its interactions with two distinct proteins (receptors) on cell
surfaces, termed ETA and ETB receptors. In general, ETA receptors are
associated with vasoconstriction and disorders of the cardiovascular and renal
systems. ETB receptors are primarily associated with vasodilation and
disorders of the central nervous system.





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                                  TBC PROGRAM

    The Company's research program is aimed at developing small molecules that
inhibit the binding of ET to its cell surface receptors. While there has been
some discussion of the need for combined inhibitors of both ETA and ETB
receptors, it is the Company's belief that specific agents for each receptor
subtype will have the best clinical utility and safety. The initial focus has
been to develop a highly potent and selective small-molecule based ETA receptor
antagonist. Company scientists have discovered a novel class of low molecular
weight compounds (mol.wt. less than 500) that antagonize ET-1 binding to the
ETA receptor at nanomolar concentrations. Using proprietary computational
methods, lead compounds were identified which mimicked the ability of ET-1 to
bind to the ETA receptor. Further optimization was then used to develop more
potent compounds until the current series of leads was identified. In addition
to their ability to block receptor binding, these compounds functionally
inhibit ET action on isolated blood vessels, in vitro, acting as full,
competitive antagonists. In addition, the lead compounds in this series have
been shown to exhibit in vivo efficacy using different rodent models:  1) to
prevent arterial pressure rise following ET-1 administration, 2) to reduce mean
arterial pressure in hypertensive rats, 3) to prevent the structural changes in
the heart in a pulmonary hypertension model, and (4) to correct hemodynamic
changes in a model of CHF. TBC has nine pending U.S. patent applications (four
of which have been issued) on the ET antagonists covering compositions of
matter and medical uses of these compositions.

    TBC 11251, a selective ETA inhibitor, has been identified as the Company's
lead compound in this program and entered clinical development for congestive
heart failure during 1996. TBC filed an IND for TBC 11251 in January 1997.

                             VASCULAR INFLAMMATION

                                   BACKGROUND

    Inflammation is the body's natural defense mechanism that fends off
bacterial, viral and parasitic infections. The inflammatory response involves
a series of events by which the body attempts to limit or destroy an injurious
agent. These steps include the production of proteins that attract white blood
cells, or leukocytes, to the site of inflammation, the production of chemicals
to destroy the injurious agent and the removal of the resulting debris. This
process is normally self-limiting and not harmful to the individual. However,
in certain instances, the process may be overly active, as during an acute
inflammatory reaction leading to a build up of leukocytes and debris at the
inflammation site, causing tissue damage.

    The initial interaction between white blood cells and the endothelial cell
layer is mediated by a group of adhesion molecules known as selectins. The
selectins are a family of three carbohydrate binding proteins. The binding of
E- selectin to its native ligand, sLex, and to related epitopes on neutrophils,
monocytes, a subset of T lymphocytes, eosinophils, and basophils is believed to
aid in the recruitment of these cells in response to inflammatory stimuli. The
selectins primarily contribute to acute inflammatory diseases that result in
tissue injury, such as adult respiratory distress syndrome and reperfusion
injury. The presence of Vascular Cell Adhesion Molecule ("VCAM") at sites of
endothelial injury leads to an accumulation at these sites of Very Late
Antigen-4 ("VLA-4")-containing macrophages. During chronic inflammatory
conditions, the body's own cells may become damaged as a consequence of the
production of harmful chemicals and debris. Diseases that are associated with
chronic inflammation include atherosclerosis, rheumatoid arthritis and
psoriasis.

                                  TBC PROGRAM

    Using its proprietary drug design technology, the Company has developed a
model of the E-selectin/sLex complex and used it to produce a novel class of
synthetic small molecule compounds that inhibit the selectin-mediated cellular
adhesion that occurs during acute inflammation. The Company believes that these
antagonists offer the possibility of reduced production cost, ease of synthesis
and oral delivery. The lead compound in the series, TBC 1269 in animal models
of inflammation, including canine coronary reperfusion injury and allergic
asthma. TBC is currently assessing TBC1269 for the treatment of asthma. TBC
1269 entered clinical development during 1996 and an IND filing is planned for
March 1997. This date is contingent upon various factors, including rate of
patient enrollment, trial results, and availability of funds.





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    TBC has also identified antagonists for the VCAM-dependent intercellular
adhesion that occurs during the accumulation of plaque in the blood vessels
(atherosclerosis). The Company's initial lead compounds are small cyclic
peptides and synthetic small molecules that block the interactions of cells
that express VCAM and VLA-4. These lead compounds are being modified in an
attempt to improve efficacy. TBC has demonstrated efficacy of TBC 772, its
lead cyclic peptide, in an animal model of acute inflammation, suggesting that
VCAM/VLA-4 plays a role in this disease process. TBC chemists have also
identified small molecule antagonists of VCAM/VLA-4 interaction, which are
currently still in research.

                         VASCULAR PROLIFERATION DISEASE

                                   BACKGROUND

    Smooth muscle cells in the blood vessel wall proliferate in response to
injury to the vessel. When the endothelial cell layer is damaged, platelets
attach to the vessel surface. Platelets and other cells begin to release
cellular growth factors, including the proteins Fibroblast Growth Factor
("FGF"), Platelet-Derived Growth Factor (PDGF) and thrombin. In response to
these growth factors, specific genes are activated in the smooth muscle cells.
The products of these genes stimulate the smooth muscle cells to move and
divide, eventually forming a scar on the vessel wall. When the initial damage
is slight, the proliferation is limited to endothelial cell repair. If the
damage is more extensive, the smooth muscle cells continue to proliferate.
Eventually, the proliferation process thickens the vessel wall, reduces the
interior size of the blood vessel and produces a stenosis (blood vessel
closure). This stenosis is comprised primarily of smooth muscle cells and
protein called fibroproliferative material. The process of producing this
fibroproliferative material is referred to as the fibroproliferative response.
Fibroproliferative stenosis differs from stenosis produced by atherosclerotic
plaque, which contains smooth muscle cells, fatty deposits and macrophages. As
with atherosclerotic plaque stenosis, however, blood flow is restricted, and
the tissue served by the vessel is deprived of oxygen. If the stenosis occurs
in a coronary artery, the heart muscle is deprived of oxygen. A heart attack
may result, in which heart muscle cells are injured or destroyed. Heart
attacks may, in turn, eventually result in heart failure.

    Fibroproliferative material is generally produced in response to extensive
damage to the blood vessel wall as a result of a mechanical injury. Mechanical
injury sufficient to produce the fibroproliferative response often occurs
during procedures designed to repair blood vessels that are occluded by plaque
or thrombus material, such as mechanical reopening of arteries (angioplasty)
and coronary artery bypass graft. Other surgical procedures, including vein
grafts, can also produce fibroproliferative stenosis. When fibroproliferative
stenosis occurs following the removal of the stenosis by surgical or other
means, it is referred to as restenosis. In addition, other types of injury to
the endothelial cell layer, such as may occur following organ transplantation,
may result in a fibroproliferative response leading to the failure of the
transplanted organ. Irrespective of how the injury is produced, the conditions
which lead to the fibroproliferative response are termed vascular proliferative
diseases.

                                  TBC PROGRAM

    The Company's research program for vascular proliferative disease is based
on an understanding of the basic mechanisms underlying smooth muscle cell
proliferation and the prevention of vessel occlusion following vascular injury.

    One approach to preventing smooth muscle cell proliferation is identifying
the factors that activate cells to proliferate and developing small molecule
antagonists to these factors. Using its knowledge of the signaling pathways
through which these factors stimulate cells to proliferate, the Company hopes
to develop products that disrupt the signaling process and prevent unnecessary
smooth muscle cell proliferation.

    The Company has focused on FGF because of a growing body of evidence as to
its central role in blood vessel formation. The Company's research has shown
that some components of the signaling pathways used by FGF are important for
smooth muscle cell proliferation. TBC's current effort on FGF involves the
development of small molecules designed to prevent activation of latent FGF to
an active form, and to block FGF receptor targets. Lead compounds in the FGF
program were identified in 1994. Optimization of the lead compounds to obtain
a clinical candidate is continuing.





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                               OTHER INDICATIONS

    The Company believes that a number of the small molecule non-carbohydrate
therapeutics that are being developed in its programs may have applications for
other indications.  For example, an FGF antagonist might be developed to treat
rheumatoid arthritis, a selectin antagonist to treat psoriasis, transplant
rejection and adult respiratory distress syndrome, and a VCAM antagonist to
treat asthma, rheumatoid arthritis and multiple sclerosis.  The Company intends
to license these non-cardiovascular indications to third parties, although no
assurance can be given that the Company will be successful in entering into any
such license.

        RESEARCH AND DEVELOPMENT COLLABORATIONS AND LICENSING AGREEMENTS

    The Company has established collaborations with a number of corporations,
research institutions and scientists to further the Company's research and
development objectives.  These collaborations are generally conducted pursuant
to agreements that grant the Company a license, or the option to license,
certain technology, patent rights or material that may be valuable to the
Company.  The Company's major agreements are summarized below.

                         GENENTECH/MITSUBISHI CHEMICAL

    In May 1993, TBC entered into an agreement with Genentech to sublicense
Genentech's rights and technology relating to NOVASTAN(R) (argatroban)
originally licensed to Genentech by Mitsubishi Chemical Corporation
("Mitsubishi"), and to license Genentech's own proprietary technology developed
with respect to NOVASTAN(R) (the "Genentech Agreement").  Under the license and
sublicense, the Company has an exclusive license to use and sell NOVASTAN(R) in
the United States and Canada for specified human cardiovascular indications,
not including cerebral thromboembolism (stroke).  The Company is required to
pay Genentech and Mitsubishi specified royalties on net sales of NOVASTAN(R) by
the Company and its sublicensees after its commercial introduction in the
United States and Canada.  Genentech has the right to terminate the agreement
or to cause the license to become non-exclusive if the Company fails to
exercise due diligence in performing its obligations under the agreement for a
period of 60 days after receiving written notice from Genentech or fails to
maintain a minimum consolidated tangible net worth of $5.0 million. The
Genentech Agreement, as amended, provides that Mitsubishi may terminate
Genentech's license with Mitsubishi (which results in the termination of the
Genentech Agreement as well) if TBC does not file an NDA for NOVASTAN(R) with
the FDA no later than June 30, 1997, subject to certain additional goals being
met by TBC.  As of December 31, 1995, TBC had not met certain of those goals.
However, Mitsubishi has agreed to withhold its rights to terminate the license
with Genentech if the NDA is filed by June 30, 1997, and if TBC accomplishes
the following milestones:  (i) on or before December 31, 1996, TBC shall have
met certain enrollment guidelines for certain NOVASTAN(R) clinical trials; (ii)
on or before March 31, 1997, TBC shall complete, report and analyze certain
other NOVASTAN(R) clinical trials; (iii) on or before September 30, 1997, TBC
shall have agreed to proceed with the Phase III trial in AMI, and (iv) TBC
shall comply with certain reporting and information meeting requirements.  If
these milestones are not met, Mitsubishi will retain the rights to terminate
the Genentech license; provided, that if such termination results from TBC's
violation of the milestone described in (iii) above, TBC will receive a license
from Mitsubishi in the field of HIT/HITTS on the same terms, as presently
included in the Genentech Agreement.  As of December 31, 1996, TBC had not met
certain of these goals and to date, Mitsubishi has not asserted its rights to
terminate the license arising out of this default.  Either party may terminate
the Genentech Agreement on 60 days notice if the other party defaults in its
material obligations under the agreement, declares bankruptcy or is insolvent,
or if a substantial portion of its property is subject to attachment.  The
Genentech Agreement is also subject to the continuation of Genentech's license
agreement with Mitsubishi, which is only terminable if Genentech defaults in
its material obligations under the agreement, declares bankruptcy or is
insolvent, or if a substantial portion of its property is subject to
attachment.  Unless terminated sooner pursuant to the above described
termination provisions, the Genentech Agreement is expected to expire in June
2007.  Under the Genentech Agreement, TBC has access to an improved formulation
patent granted in 1993 which expires in 2010 and a use patent which expires in
2009.

    Mitsubishi further agreed to supply the Company with its requirements of
NOVASTAN(R) throughout the term of the Genentech Agreement for TBC's clinical
testing and commercial sales of NOVASTAN(R) in the United States and Canada.
In the event Mitsubishi should discontinue the manufacture of NOVASTAN(R),
Mitsubishi, Genentech and 




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TBC have agreed to discuss in good faith the means by which, and the party to
whom, NOVASTAN(R) production technology will be transferred.  The transferee
may be a person or entity other than Genentech or TBC.  At present, Mitsubishi
is the only manufacturer of NOVASTAN(R).  Should Mitsubishi terminate or
default in its supply commitment, there can be no assurance that alternate
sources of bulk NOVASTAN(R) will be available to the Company at reasonable
cost, if at all.  If such alternate sources of supply are unavailable or
uneconomic, the Company's results of operations would be materially and
adversely affected.
        
    In exchange for the license to Genentech's NOVASTAN(R) technology, TBC
issued Genentech 285,714 shares of Common Stock and agreed to issue (i) an
additional 214,286 shares of Common Stock to Genentech within 10 days after the
filing of the first New Drug Application ("NDA") with the FDA for NOVASTAN(R),
and (ii) an additional 71,429 shares of Common Stock to Genentech within 10
days after the FDA's first approval of an NDA for NOVASTAN(R).  The Company has
also agreed to grant Genentech a warrant to purchase an additional 142,858
shares of Common Stock at an exercise price of $14.00 per share, subject to
adjustment, within ten days of the filing of the first NDA  for NOVASTAN(R)
with the FDA.  If the Company is unable to issue any of the additional shares
of Common Stock or the warrant to Genentech due to circumstances beyond the
Company's control, the Company has agreed to pay Genentech, in lieu thereof, an
amount equal to the value of the securities plus interest from May 27, 1993 at
the prime rate plus one percent, compounded annually.  The value of the Common
Stock is deemed to be $7.00 per share, which represents the cash consideration
the Company will be obligated to pay to Genentech as liquidated damages, and
the value of the warrants is to be determined by appraisal, based on the
warrants' market value.  The Company will not be required to make any cash
payment if both of the filing and approval of the NDA do not occur.  TBC has
also granted Genentech demand and piggyback registration rights with regard to
shares of Common Stock issued to Genentech. In connection with the Genentech
Agreement, a consultant involved in negotiations related to the Agreement will
receive a royalty on net sales of licensed products.

                                   SYNTHeLABO

    On October 11, 1994, the Company signed a collaborative agreement with
Synthelabo, a French pharmaceutical group, to develop and market compounds for
vascular proliferative disease derived from the Company's research programs.
Upon consummation of the transaction, Synthelabo purchased 1,428,571 shares of
Common Stock for $3.50 per share for a total of $5 million and paid the Company
a non-refundable licensing fee of $3 million.  In addition, Synthelabo
committed to pay $3 million annually in research payments (payable in quarterly
installments of $750,000). Beginning October 31, 1996, the parties to the
agreement have agreed to revise the payment for the third year to be $750,000
which has already been paid.  Synthelabo has agreed, upon the achievement of
certain milestones, to make further payments of up to $3 million per year for
up to $18 million in total.  Synthelabo has the right to terminate the
agreement any time on or after October 15, 1997 for any reason and either party
has the right to terminate the contract for breach of any material obligation.
If Synthelabo exercises this termination right, the license granted to
Synthelabo will  terminate and TBC will pay Synthelabo a royalty on net sales
of any products sold in a certain territory (Europe, Middle East, Africa and
countries of the former Soviet Union) for a period of time.  In addition,
Synthelabo may, at its option, require that the technology be transferred to
and the development program be conducted by a joint venture owned by TBC and
Synthelabo should "net worth", as defined in the agreement, be less than $5
million as of the end of any calendar quarter during the term of the agreement.
For the years ended December 31, 1995 and December 31, 1996, TBC received $3
million related to the Synthelabo agreement.  No such payments will be made in
1997.  Synthelabo will pay royalties to TBC based on the net sales in those
areas covered in the agreement.  In exchange for the above consideration,
Synthelabo will receive an exclusive license to manufacture, use, and sell any
products generated from the research, in Europe, the Middle East, Africa and
the countries of the former Soviet Union.

    During 1996, the Company signed two agreements with Synthelabo with respect
to the supply of information related to certain clinical studies regarding
NOVASTAN(R). Over the term of the agreements as certain milestones are met,
Synthelabo has committed to pay TBC up to $2,920,000 of which $1,895,000 has
been received as of December 31, 1996.  These payments are dependent on rate of
enrollment in certain clinical studies, the completion of certain clinical
studies and date of completion of certain clinical studies. Synthelabo is the
licensee for NOVASTAN(R) in certain territories other than those which were
sublicensed to TBC.



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<PAGE>   8
                               LG CHEMICAL, LTD.

    On October 10, 1996, the Company signed a strategic alliance agreement with
LG Chemical, Ltd. ("LG Chem"), a Korean corporation, to develop and market
compounds derived from the Company's Endothelin Receptor and Selectin
Antagonist for certain disease indications. Upon consummation of the
transaction, LG Chem purchased 1,250,000 shares of common stock for $4.00 per
share for a total of $5 million. In addition, LG Chem has committed to pay
$10.7 million in research payments. Of this amount, $100,000 was paid by
December 31, 1996, $1.0 million on each of June 30 and December 31 of 1997,
1998, 1999 and 2000, and $1.3 million on June 30 and December 31, 2001. LG
Chem has the right to terminate future research payments if TBC fails to meet
certain agreement milestones, which milestones will be established by the
parties in accordance with the agreement. LG Chem will pay royalties to TBC,
based on net sales, in those geographic areas covered by the agreement, which
include Korea, China, India and certain other Asian countries, excluding Japan.
The Company will pay its agents in the contract negotiations, a commission on
all future research payments as well as a royalty on net sales.

                              LICENSES AND PATENTS

    Because of the substantial length of time and expense associated with
developing new pharmaceutical products, the biotechnology industry places
considerable importance on obtaining patent and trade secret protection for new
technologies, products and processes. The Company's policy is to file patent
applications to protect technology, inventions and improvements that are
important to the development of its business. The Company has 13 pending
patent applications (1 of which has been allowed) and 9 issued United States
patents covering compounds including selectin inhibitors, endothelin
antagonists, VCAM/VLA-4 antagonists and proprietary rational drug design
technology. In addition, the Company has exclusive licenses to 2 patents
covering rational drug design technology. The Company has also filed patent
applications in certain foreign jurisdictions covering projects that are the
subject of United States applications and intends to file additional patent
applications as its research projects develop. The Company licensed the United
States and Canadian rights to NOVASTAN(R) from Genentech in 1993, which
licensed the product from Mitsubishi as part of a multi-product cross-licensing
agreement which included access to an improved formulation patent granted in
1993 which expires in 2010 and a use patent which expires in 2009. If any of
the NOVASTAN(R) patents remain outstanding at the time NOVASTAN(R) receives FDA
approval, the Company may apply, under the Waxman/Hatch Act, for up to a
five-year extension of one such patent. If all such patents have expired at
the time NOVASTAN(R) receives FDA approval, the Waxman/Hatch Act will grant the
Company NDA exclusivity for up to five years, during which time the FDA may not
accept or approve abbreviated applications for generic variations of
NOVASTAN(R). Although the Company believes that the expiration of the
NOVASTAN(R) patents will not have a material adverse effect on the
commercialization of NOVASTAN(R), there can be no assurance that the Company
will be able to take advantage of either the patent term extension or NDA
exclusivity provisions of the Waxman/Hatch Act. Moreover, even if the Company
receives either a patent term extension or NDA exclusivity, there can be no
assurance that generic pharmaceutical manufacturers will not ultimately enter
the market and compete with the Company.

    The patent positions of biopharmaceutical firms, including the Company, are
uncertain and involve complex legal and factual questions. Consequently, the
Company does not know whether any of its applications will result in the
issuance of patents or, if any patents are issued, whether they will provide
significant proprietary protection or will be circumvented or invalidated.
Since patent applications in the United States are maintained in secrecy until
patents issue, and since publication of discoveries in the scientific or patent
literature often lags behind actual discoveries, the Company cannot be certain
that it was the first creator of inventions covered by its pending patent
applications or that it was the first to file patent applications for such
inventions. Moreover, the Company may have to participate in interference
proceedings declared by the PTO to determine priority of invention, which could
result in substantial cost to the Company, even if the eventual outcome is
favorable to the Company. There can be no assurance that the Company's
patents, if issued, would be held valid by a court of competent jurisdiction.
An adverse outcome could subject the Company to significant liabilities to
third parties, require disputed rights to be licensed from third parties or
require the Company to cease using such technology.

    The development of therapeutic products for cardiovascular applications is
intensely competitive. Many pharmaceutical companies, biotechnology companies,
universities and research institutions have filed patent





                                       8
<PAGE>   9
applications or received patents in this field. Some of these applications or
patents may be competitive with the Company's applications or conflict in
certain respects with claims made under the Company's applications. Such
conflict could result in a significant reduction of the coverage of the
Company's patents, if issued. In addition, if patents are issued to other
companies that contain competitive or conflicting claims and such claims are
ultimately determined to be valid, no assurance can be given that the Company
would be able to obtain licenses to these patents at a reasonable cost or
develop or obtain alternative technology.

    The Company also relies upon trade secret protection for its confidential
and proprietary information. No assurance can be given that others will not
independently develop substantially equivalent proprietary information and
techniques or otherwise gain access to the Company's trade secrets or disclose
such technology, or that the Company can meaningfully protect its trade
secrets.

    The Company requires its employees, consultants, members of the Scientific
Advisory Board, outside scientific collaborators and sponsored researchers and
certain other advisors to enter into confidentiality agreements with the
Company that contain assignment of invention clauses. These agreements provide
that all confidential information developed or made known to the individual
during the course of the individual's relationship with the Company is to be
kept confidential and not disclosed to third parties except in specific
circumstances. In the case of employees, the agreements provide that all
inventions conceived by the employee are the exclusive property of the Company.
There can be no assurance, however, that these agreements will provide
meaningful protection or adequate remedies for the Company's trade secrets in
the event of unauthorized use or disclosure of such information.

                             GOVERNMENT REGULATION

    Regulation by governmental authorities in the United States and other
countries will be a significant factor in the production and marketing of any
products which may be developed by the Company. The nature and the extent to
which such regulation may apply to the Company will vary depending on the
nature of any such products. Virtually all of the Company's products will
require regulatory approval by governmental agencies prior to
commercialization. In particular, human therapeutic products are subject to
rigorous preclinical and clinical testing and other approval procedures by the
FDA and similar health authorities in foreign countries. Various federal
statutes and regulations also govern or influence the manufacturing, safety,
labeling, storage, record keeping and marketing of such products. The process
of obtaining these approvals and the subsequent compliance with appropriate
federal and foreign statutes and regulations requires the expenditure of
substantial resources.

    The effect of government regulation may be to delay for a considerable
period of time or prevent the marketing of any product that the Company may
develop and/or to impose costly procedures on the Company's activities, the
result of which may be to furnish an advantage to the Company's competitors.
Any delay in obtaining or failure to obtain such approvals would adversely
affect the marketing of the Company's products and its  ability to earn product
revenue.

    In order to test clinically, produce and market products for diagnostic or
therapeutic use, a Company must comply with mandatory procedures and safety
standards established by the FDA, the Health Protection Branch ("HPB") in
Canada, and comparable agencies in foreign countries. Before beginning human
clinical testing of a potential new drug, a Company must file an IND and
receive clearance from the FDA. This application is a summary of the
preclinical studies that were conducted to characterize the drug, including
toxicity and safety studies, as well as an in-depth discussion of the human
clinical studies which are being proposed.

    The pre-marketing program required for approval of a new drug typically
involves a time-consuming and costly three-phase process. In Phase I, trials
are conducted with a small number of patients to determine the early safety
profile, the pattern of drug distribution and metabolism. In Phase II, trials
are conducted with groups of patients afflicted with a target disease in order
to determine preliminary efficacy, optimal dosages and expanded evidence of
safety. In Phase III, large scale, multi-center comparative trials are
conducted with patients afflicted with a target disease in order to provide
enough data for statistical proof of efficacy and safety required by the FDA
and others.

    The FDA closely monitors the progress of each of the three phases of
clinical testing and may, in its discretion, reevaluate, alter, suspend or
terminate the testing based on the data that have been accumulated to that
point and its





                                       9
<PAGE>   10
assessment of the risk/benefit ratio to the patient. Estimates of the total
time required for carrying out such clinical testing vary between two and ten
years. Upon completion of such clinical testing, a company typically submits a
new drug application to the FDA that summarizes the results and observations of
the drug during the clinical testing. Based on its review of the new drug
application, the FDA will decide whether or not to approve the drug. This
review process can be quite lengthy, and approval for the production and
marketing of a new pharmaceutical product can require a number of years and
substantial funding, and there can be no assurance that any approvals will be
granted on a timely basis, if at all.

    Once the sale of a product is approved, FDA regulations govern the
production process and marketing activities, and a post-marketing testing and
surveillance program may be required to monitor continuously a product's usage
and effects. Product approvals may be withdrawn if compliance with regulatory
standards is not maintained. Other countries in which any products developed
by the Company may be marketed impose a similar regulatory process.

                                  COMPETITION

    The development and sale of new drugs for the treatment of cardiovascular
diseases is highly competitive and the Company will face intense competition
from major pharmaceutical companies and biotechnology companies worldwide.
Competition may increase further as a result of advances made in the commercial
applicability of technologies and greater availability of capital for
investment in these fields. 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, significant research in biotechnology and cardiovascular medicine may
occur in universities and other nonprofit research institutions. These
entities have become increasingly active in seeking patent protection and
licensing revenues for their research results. They also compete with the
Company in recruiting talented scientists.

    Primary competitors for NOVASTAN(R) in the intravenous heparin replacement
market are initially expected to be Hirulog (bivalirudin), Revasc (desirudin)
and lepirudin, manufactured by Biogen, Inc., Ciba-Geigy and Hoechst Marion
Roussel ("HMR"), respectively. Both of these compounds are in Phase III
clinical trials.

    Biogen has completed a large Phase III trial on Hirulog which demonstrated
better safety versus heparin but only equal efficacy. As a result of this
study, Biogen has halted development of Hirulog and is attempting to outlicense
the compound. The Company anticipates the Hirulog peptide will have a
relatively high cost of goods. An improved manufacturing process for Hirulog
with a lower cost of goods has been reported, and may become a competitive
factor should the product be approved for marketing.

    Revasc from Ciba-Geigy has been studied in two large Phase III trials for
acute myocardial infarction and unstable angina. Both trials, TIMI-9 and GUSTO
II, were halted in late 1994 due to increased hemorrhagic stroke. Both trials
resumed with reduced Revasc dosing. The bleeding complications with Revasc may
handicap the product in the marketplace. Revasc was found to have mixed
efficacy results versus heparin in TIMI-9 and Gusto II in terms of efficacy.
As a result of these mixed efficacy and safety results, development of Revasc
for acute coronary syndrome has been halted. Another hirudin compound,
lepirudin, from HMR is in development for HIT and acute MI.

    If either Hirulog, Revasc or lepirudin obtains regulatory approval prior to
NOVASTAN(R), these companies may gain a competitive advantage. Other compounds
which may be competitive with NOVASTAN(R) include napsagatran from Roche and
inogatran from Astra. These compounds are very similar to NOVASTAN(R) and
could have similar pharmacologic profiles. Both napsagatran and inogatran are
in phase II trials for various indications including unstable angina.

    A defibrinogenating snake venom, ancrod from Knoll may be submitted for
approval to the FDA for HIT in the near future. This drug, which is available
in Canada, is believed to have certain competitive liabilities including
difficulty in dosing, allergic reactions to the medication, and limited
efficacy.





                                       10
<PAGE>   11
    Low Molecular Weight Heparins ("LMWH") are newer forms of heparin and are
used in prophylaxis for deep vein thrombosis following orthopedic surgery. In
the initial indication of interest to the Company, HIT and HITTS, most LMWHs
also carry an immunological risk for precipitating HIT, and may be
inappropriate as therapy in patients with HIT or HITTS. A low molecular weight
heparinoid, Orgaran (danapariod) from Organon has been approved for deep vein
thrombosis. Organon has conducted trials with this drug in HIT, although the
Company is not aware of an FDA filing for HIT.

    The Company believes that its ability to compete successfully will depend
on its capability to create and maintain scientifically advanced technology,
develop proprietary products, attract and retain scientific personnel, obtain
patent or other protection for its products, obtain required regulatory
approvals and manufacture and successfully market products either alone or
through other parties. Many competitors have substantially greater financial,
marketing, and human resources than those of the Company. Therefore, the
Company expects to encounter significant long-term competition.

                          MANUFACTURING AND MARKETING

    TBC relies on its internal resources and third-party manufacturers to
produce compounds for preclinical development. Currently, the Company has no
manufacturing facilities for either the production of biochemicals or the
manufacture of final dosage forms. The Company believes that all of its
existing compounds can be produced using established manufacturing methods,
including traditional pharmaceutical synthesis.

    TBC has established supply arrangements with third-party manufacturers for
clinical trials and ultimately will establish arrangements with third party
manufacturers for commercial distribution, although there can be no assurance
that such arrangements will be established on reasonable terms. Mitsubishi
Chemical has agreed to supply the Company's requirements of bulk NOVASTAN(R)
during the term of the Genentech Agreement. The Company's long-range plan is
to establish internal manufacturing of small molecule therapeutics, including
the ability to formulate, fill, label, package and distribute its products.
However, the Company does not anticipate developing this capability for some
time, nor is it able to determine which of its potential products, if any, will
be appropriate for internal manufacturing. The primary factors the Company
will consider in making this determination are the availability and cost of
third-party sources, the expertise required to manufacture the product and the
anticipated manufacturing volume.

    TBC intends to market products for which it gains approval either directly
or through co-promotion or other licensing arrangements with large
pharmaceutical, biopharmaceutical or biotechnology companies. Ultimately, TBC
intends (i) to build a targeted, hospital-based sales force in the United
States and Canada to sell NOVASTAN(R) and subsequent products and (ii) to
establish strategic partner relationships for non-cardiovascular products and
for customer groups outside TBC's targeted markets or in some cases to
co-promote in such markets with partners to optimize the value of its products.

                                HUMAN RESOURCES

    As of December 31, 1996, TBC employed 73 individuals. TBC has 60 employees
engaged directly in research and development activities and 11 in general and
administrative positions. None of the Company's employees is represented by a
labor union. The Company has experienced no work stoppages and believes that
its relations with its employees are good. During the first half of 1996 the
Company consolidated its IPI operations into its Houston location and relocated
certain employees to Houston, Texas.

    The Company's policy is to have each employee enter into a confidentiality
agreement which contains provisions prohibiting the disclosure of confidential
information to anyone outside the Company and requiring disclosure to the
Company of ideas, developments, discoveries or inventions conceived during
employment and assignment to the Company of proprietary rights to such matters
related to the business and technology of the Company.

    TBC's success is highly dependent on its ability to attract and retain
qualified scientific and management personnel. In order to commercialize its
products, the Company may need to substantially expand its personnel,





                                       11
<PAGE>   12
particularly in the areas of clinical trial management, manufacturing, sales
and marketing. The Company faces intense competition for such personnel from
other companies, academic institutions, government entities and other
organizations. There can be no assurance that the Company will be successful
in hiring or retaining qualified personnel.

                   SCIENTIFIC ADVISORY BOARD AND CONSULTANTS

    The Company has assembled a Scientific Advisory Board composed of
distinguished professors from some of the most prestigious medical schools.
The Scientific Advisory Board is assisting the Company in identifying research
and development opportunities, in reviewing with management the progress of the
Company's projects and in recruiting and evaluating scientific staff. Although
the Company expects to receive guidance from the members of its Scientific
Advisory Board, all of its members are employed on a full-time basis by others
and, accordingly, are able to devote only a small portion of their time to the
Company. Management expects to meet with its Scientific Advisory Board members
as a group at least once each year and individually from time to time on an
informal basis. Each of the members of the Scientific Advisory Board has
entered into a consulting agreement with the Company. The Scientific Advisory
Board includes James T. Willerson, M.D., as Chairman, and the following
scientists.

    Morris J. Karnovsky, M.D. has served since 1972 as Shattuck Professor of
Pathological Anatomy at Harvard Medical School, where he was Chairman of the
Program in Cell and Developmental Biology from 1975 to 1989. Dr. Karnovsky
received the E.B. Wilson Award from the American Society for Cell Biology and
was inducted into the Institute of Medicine by the National Academy of Sciences
in 1991. In 1984, Dr. Karnovsky was elected to serve as President of the
American Society for Cell Biology. He is a member of numerous professional and
honorary societies, editorial boards and is the author or co-author of more
than 275 scientific articles.

    Joseph F. Sambrook, Ph.D. is a Professor of Pathology at Melbourne
University, Australia and Director of Research at Peter MacCallum Cancer
Institute. He is a member of various honorary and professional societies,
editorial boards and is the author of more than 100 scientific articles.
Professor Sambrook previously worked for 20 years in the USA where he served on
many blue ribbon government and non government committees.

    Ajit Varki, M.D. has been a Professor of Medicine since 1991 and is
currently serving in that position as well as Associate Director for Basic
Research at the University of California, San Diego. Dr. Varki served as
Instructor in Medicine at Washington University School of Medicine from 1980 to
1982. He also served as Assistant Professor of Medicine from 1982 to 1987 and
as Associate Professor of Medicine from 1987 to 1991 at the University of
California, San Diego. In 1975, Dr. Varki received an M.D. from Christian
Medical College and his Post-Doctorate in Biochemistry from Washington
University from 1979 to 1982. He is a member of various professional societies
and has won numerous awards since 1969. Dr. Varki is the author or co-author
of 106 scientific publications.

    The Company also has agreements with various outside scientific consultants
who assist the Company in formulating its research and development strategy.
All of the Company's consultants and advisors are employed by employers other
than the Company and may have commitments to or consulting or advisory
contracts with other entities that may affect their ability to contribute to
the Company.

    Dr. Denton Cooley, Surgeon-in-Chief of the Texas Heart Institute, acts as
an advisory director to the Company.

ITEM 2. PROPERTIES

    TBC leases approximately 29,300 square feet of office and laboratory space
in Houston, Texas, including a 16,671 square foot laboratory facility and a
3,909 square foot animal facility. The remaining area is being used for
clinical development and administrative offices, storage space and additional
offices for scientists. The lease was effective January 1, 1995, and calls for
a lease term of six years at an annual rate of $706,663 through December 2000,
subject to adjustments based on certain variable building operating expenses.
The lease also includes a provision for the Company to pay certain additional
charges to obtain utilities and building services during off-business hours.
Currently, the amount of these charges is approximately $253,400 per annum,
payable monthly and subject to annual adjustments based on the local consumer
price index. The Company may require additional space





                                       12
<PAGE>   13
to accommodate future research and laboratory needs as necessary to bring
products into development and clinical trials. The Company believes that these
facilities are adequate for its present needs.

ITEM 3. LEGAL PROCEEDINGS

    On November 21, 1994, a class action shareholders' suit was filed in the
United States District Court for the Southern District of Texas, Houston
Division seeking damages in the amount of $16 million. Plaintiffs are two
individuals who purchased shares of the Company on December 16, 1993 following
the Company's initial public offering. In their complaint, plaintiffs have
sued the Company, and certain members of the board of directors and certain
officers alleging violations of Sections 11, 12 and 15 of the Securities Act of
1933, as amended (the "Act"). Plaintiffs have also named David Blech, D. Blech
& Co., Incorporated and Isaac Blech as defendants. On January 23, 1995, the
Company and the members of the board of directors filed a motion to dismiss the
plaintiffs' complaint pursuant to Rule 9(b) and Rule 12b(6) of the Federal
Rules of Civil Procedure. In addition, defendant John Pietruski, Chairman of
the Board of Directors, filed a motion to dismiss the plaintiffs' complaint
pursuant to Rule 12(b)(2) of the Federal Rules of Civil Procedure. On February
7, 1995, the plaintiffs filed a motion for class certification. The Court
denied the motion by the Company and by John Pietruski.

    On March 28, 1995, a second class action shareholders' suit was filed in
the United States District Court for the Southern District of New York seeking
unspecified damages. Plaintiffs are eight individuals who purchased shares in
various companies for which D. Blech & Co. acted as an underwriter (or
co-underwriter) or marketmaker. In their complaint, the plaintiffs have sued
the Company alleging violations of Section 10(b) of the Securities Exchange Act
of 1934, as Amended (the "Exchange Act") and Rule 10b-5 promulgated thereunder
by the Securities and Exchange Commission (the "Commission"). Plaintiffs have
named a number of defendants, including David Blech and D. Blech & Co., four
individuals, two brokerage firms, one investment management company and ten
other companies for which D. Blech & Co. acted as underwriter or marketmaker.

    On August 14, 1995, the Judicial Panel on The Multi-District Litigation
ordered that the action filed in the United States District Court for the
Southern District of Texas, Houston Division be transferred to the United
States District Court for the Southern District of New York for coordinated or
consolidated pretrial proceedings with the action pending there.  In light of
the transfer and consolidation of the Texas case with similar cases against
other companies for which Blech acted as underwriter, the Company requested
that the Court in New York reconsider the Texas Court's denial of its motion to
dismiss as a part of the Court's consideration of similar motions to dismiss
filed by those companies. All of these motions were presented to the Court on
February 6, 1996. On June 6, 1996, the New York District Court entered two
memorandum opinions in the consolidated cases. In one of its opinions, the
Court dismissed all of the Exchange Act and common law fraud claims filed
against the Company and its officers and directors, but afforded those
plaintiffs the right to attempt to preserve those claims by repleading them.
The Court ordered that those claims be repleaded no later than July 26, 1996.
Plaintiffs did not replead those claims by the deadline, resulting in the
dismissal of all claims against the Company in that litigation. In its opinion
in the second case, i.e., the case filed on November 21, 1994, the Court
granted the Company and its officers and directors' motion for reconsideration,
but together with all other similar pending motions, denied the requested
relief. Pursuant to the court's order, the Company therefore filed an answer
in that case. The Company also filed a Motion seeking leave of court to
prosecute an immediate appeal of the Court's denial of the Company's Motion to
Dismiss. The Court heard argument on that Motion on October 10, 1996. The
motion was denied on January 16, 1997. Given the early stage of that case,
which is the only remaining shareholder litigation against the Company, the
Company is unable to evaluate its potential outcome at this time. The Company
disputes these claims and intends to contest them vigorously.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

      No matters were submitted to a vote of TBC's stockholders during the
fourth quarter of its fiscal year ended December 31, 1996.





                                       13
<PAGE>   14
                                    PART II

ITEM 5. MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
        MATTERS

    From December 16, 1993 until November 6, 1994, the Company's Unit security,
which consisted of one share of Common Stock and one redeemable common stock
purchase warrant, was traded on the American Stock Exchange ("AMEX") under the
symbol TXB.E. Prior to December 16, 1993, there was no public market for the
Company's securities. On November 7, 1994, the Unit separated, and the Common
Stock and redeemable common stock purchase warrants began trading separately on
the American Stock Exchange under the symbols TXB and TXB.WS, respectively.

<TABLE>
<CAPTION>
                                                          HIGH       LOW
                                                          ----       ---
    <S>                                                 <C>        <C>       <C>
    YEAR ENDED DECEMBER 31, 1995
      First Quarter                                      1 3/4     1 1/4     Common Stock
      Second Quarter                                   1 15/16     1 1/4     Common Stock
      Third Quarter                                      3 3/4    1 5/16     Common Stock
      Fourth Quarter                                   2 13/16   1 11/16     Common Stock

    YEAR ENDED DECEMBER 31, 1996
      First Quarter                                      5 1/2        2      Common Stock
      Second Quarter                                    6 9/16     3 1/2     Common Stock
      Third Quarter                                     4 7/16     2 3/8     Common Stock
      Fourth Quarter                                     4 3/4   2 15/16     Common Stock
</TABLE>

As of February 28, 1997 there were approximately 467 holders of record of
common stock of the Company. On February 28, 1997, the last sale price
reported on the AMEX was $5 13/16 per share. The Company has never paid
dividends and does not anticipate paying any cash dividends in the foreseeable
future. The Company intends to retain any future earnings and capital for use
in its business.

                    RECENT SALES OF UNREGISTERED SECURITIES

Common Stock Transactions

    On February 13, 1996, the Company completed a private placement of Common
Stock to institutional investors and certain individuals (the "Private
Placement"). The Company issued 6,550,990 shares of Common Stock at $2 1/8 per
share for aggregate gross proceeds of $13,920,854, and paid selling commissions
of $759,283. In connection with the Private Placement, the co-exclusive agent,
Harris, Webb & Garrison received a $634,630 selling commission. The
co-exclusive agent, Aurora Capital Corp., received a $124,653 selling
commission. In accordance with the terms of the offering, the Company filed,
pursuant to Rule 415 of the Securities Act, a Shelf Registration Statement as
to the resale of the shares of Common Stock sold to the purchasers in the
Private Placement which became effective on June 4, 1996. The Common Stock
issuance was exempt from registration under Section 4 (2) of the Securities Act
of 1933, as amended, and Regulation D promulgated thereunder.

    On April 1, 1996, May 30, 1996, June 10, 1996, June 30, 1996 and July 1,
1996, the Company issued an aggregate of 57,274 shares of its Common Stock to a
certain institution and individuals, pursuant to the exercise of outstanding
warrants for an aggregate purchase price of $200,459. The issuance of the
Common Stock was exempt from registration under Section 4 (2) of the Securities
Act of 1933, as amended, and Regulation D promulgated thereunder. The warrants
and the Common Stock underlying the warrants may not be sold in the United
States absent registration or an applicable exemption from registration
requirements.





                                       14
<PAGE>   15
Warrant Transactions

    In conjunction with the Private Placement completed on February 13, 1996,
the Company issued warrants to the co- agents who participated in the offering.
Co-agent, Harris, Webb & Garrison received 49,775 warrants with an exercise
price of $3.05 per share and no registration rights, and 497,749 warrants with
an exercise price of $3.66 per share with the underlying Common Stock being
registered, under certain circumstances, on a "piggyback" basis. Co-agent,
Aurora Capital Corp. received 25,587 warrants with an exercise price of $3.36
per share, and 157,350 warrants, with an exercise price of $4.58 per share.
The resale of the Common Stock underlying Aurora's warrants was registered
along with the Common Stock issued in the Private Placement. The issuance of
the warrants was exempt from registration under Section 4 (2) of the Securities
Act of 1933, as amended, and Regulation D promulgated thereunder. The Common
Stock underlying the warrants may not be sold in the United States absent
registration or an applicable exemption from registration requirements.

    On October 10, 1996 the Company signed a strategic alliance agreement and
Common Stock purchase agreement with LG Chemical, Ltd., a Korean corporation
("LG Chem"), and in conjunction therewith, the Company's agents in the contract
negotiations, Raymond James & Associates, Inc. and Mitani & Co., Inc., each
received 56,818 warrants exercisable at $4.40 per share with the resale of the
underlying Common Stock subject to certain piggyback registration rights. The
issuance of the warrants was exempt from registration under Section 4 (2) of
the Securities Act of 1933, as amended, and Regulation D promulgated
thereunder. The warrants and the Common Stock underlying the warrants may not
be sold in the United States absent registration or an applicable exemption
from registration requirements.





                                       15
<PAGE>   16
ITEM 6. SELECTED FINANCIAL DATA

    The selected financial data presented below as of and for each of the
fiscal years in the five-year period ended December 31, 1996 and for the period
from August 2, 1989 to December 31, 1996 are derived from the Company's audited
financial statements. These selected financial data should be read in
conjunction with "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and the financial statements and notes thereto.


<TABLE>
<CAPTION>
                                                                                                                        AUGUST 2,
                                                                                                                      1989 (DATE OF
                                                                                                                      INCORPORATION)
                                                                       YEARS ENDED                                         TO
                                                                       DECEMBER 31,                                   DECEMBER 31,
                                        ---------------------------------------------------------------------------   -------------
                                            1996           1995            1994            1993            1992           1996
                                        ------------   ------------    ------------    ------------    ------------   ------------
<S>                                     <C>            <C>             <C>             <C>             <C>            <C>         
STATEMENT OF OPERATIONS DATA:
Revenues                                $  5,405,776   $  7,234,002    $  4,718,785    $    149,764    $         --   $ 17,508,327
                                        ------------   ------------    ------------    ------------    ------------   ------------
Expenses:
   Research & Development                 22,251,895     14,949,822       8,936,004       6,098,282       3,012,880     55,839,550
   Charge for purchase of in-process
       research and development                   --      2,061,383       6,404,227       1,000,000              --      9,465,610
   General & Administrative                4,067,505      4,693,019       3,992,183       2,590,900       1,994,710     19,472,139
   Restructuring & Impairment                421,165        643,750              --              --              --      1,064,915
                                        ------------   ------------    ------------    ------------    ------------   ------------
      Total expenses                      26,740,565     22,347,974      19,332,414       9,689,182       5,007,590     85,842,214
                                        ------------   ------------    ------------    ------------    ------------   ------------
Other Income
    Interest Income                          898,039      1,200,921       1,011,251         212,433         474,967      4,117,158
    Interest Expense                              --         (1,068)         (1,315)         (1,509)             --        (91,647)
                                        ------------   ------------    ------------    ------------    ------------   ------------
Net loss                                $ 20,436,750   $ 13,914,119    $ 13,603,693    $  9,328,494    $  4,532,623   $ 64,308,376
                                        ============   ============    ============    ============    ============   ============
Net loss per  share(1)                  $        .87   $        .83    $        .97    $       1.05    $        .52   $       6.14
                                        ============   ============    ============    ============    ============   ============
Weighted average common shares
   used to compute net loss per share     23,616,033     16,748,995      14,018,269       8,896,780       8,635,229     10,470,502
</TABLE>

<TABLE>
<CAPTION>
                                                                          DECEMBER 31,
                                          -----------------------------------------------------------------------------
                                              1996            1995             1994            1993            1992
                                          ------------    ------------     ------------    ------------     -----------
<S>                                       <C>             <C>              <C>             <C>              <C>        
BALANCE SHEET DATA:
Working capital                           $ 10,109,803    $ 11,927,296     $ 22,930,263    $ 23,188,611     $ 9,680,218
Total assets                                18,180,121      18,926,499       31,192,345      27,996,255      14,657,943
Short-term debt                                     --              --               --          79,536              --
Stockholders' equity                        13,627,406      15,710,125       27,557,596      27,087,065      14,319,645
</TABLE>

- --------------
(1)  For information concerning calculation of net loss per share, see Note
     1(g) of Notes to Consolidated Financial Statements.





                                       16
<PAGE>   17
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS

                                    OVERVIEW

    Since its inception in 1989, the Company has primarily devoted its
resources to fund research, drug discovery and development. The Company has
been unprofitable to date and expects to incur substantial losses for the next
several years as the Company invests in product research and development,
preclinical and clinical testing and regulatory compliance. The Company has
sustained net losses of $64,308,376 from inception to December 31, 1996. The
Company has primarily financed its operations to date through private
placements of common stock and debt, which have raised an aggregate of $21.3
million in net proceeds, an initial public offering ("IPO") of a Unit security
which raised an aggregate of $24.2 million in net proceeds including the
over-allotment sold in January 1994 and a private placement of common stock on
February 13, 1996, which raised $13.0 million in net proceeds. On July 25,
1994, the Company acquired all of the outstanding stock of IPI in exchange for
common stock of the Company. IPI's results of operations have been included in
the consolidated results of operations beginning August 1, 1994. The Company
signed a collaborative agreement with Synthelabo, a French pharmaceutical group
on October 11, 1994. Upon consummation of the transaction, Synthelabo
purchased 1,428,571 shares of common stock for a total of $5 million and paid a
licensing fee of $3 million. In addition, Synthelabo has paid $3 million
annually in research payments (payable in quarterly installments) for two years
and paid $750,000 for the third year. During 1996, TBC signed an agreement
with Synthelabo to provide copies of certain clinical data. Over the life of
the agreement TBC may receive as much as $2.9 million, of which $1.9 million
has been received as of December 31, 1996. The Company's operating results
have fluctuated significantly during each quarter, and the Company anticipates
that such fluctuations, largely attributable to varying research and
development commitments and expenditures, will continue for the next several
years. During October 1996, the Company executed a research and common stock
purchase agreement with LG Chem. LG Chem purchased $5 million in Common Stock
of the Company and committed to pay up to $10.7 million over a five year period
to develop and market two compounds in clinical development.

    The Company expended approximately $22,252,000, $14,950,000, $8,936,000,
$6,098,000, $3,013,000, $501,000 and $90,000 on research and development and
clinical development during the years 1996, 1995, 1994, 1993, 1992 and 1991 and
the period from August 2, 1989 (date of incorporation) through December 31,
1990, respectively. In addition, the Company recorded non-cash charges of
$2,061,383 and $6,404,227 during the years 1996 and 1995, respectively for
purchase of in-process research and development. Expenditures on research and
development and clinical development are expected to increase during 1997 and
subsequent years.

                            RESULTS OF OPERATIONS
                                      
                 YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994

    Revenues were $5,405,776, $7,234,002 and $4,718,785 during 1996, 1995 and
1994, respectively. Revenues included grant income of $1,727, $227,938 and
$289,522 in 1996, 1995 and 1994, respectively. For the years 1996, 1995 and
1994, respectively, revenues also included $8,939, $217,707 and $178,934 of
product sales from the Company's subsidiary IPI and $5,395,110, $6,788,357 and
$4,250,329 from research agreements and collaborations with various other
companies. Revenues from research agreements in 1996 includes $2.6 million in
research payments from Synthelabo and $2.3 million for data supplied to
Synthelabo. Revenues from research agreements in 1995 includes $3 million in
research payments related to the agreement with Synthelabo and a $2 million
additional research payment from EISAI for attainment of a milestone. Revenues
from research agreements in 1994 includes a $3 million license fee and $500,000
in research payments related to the agreement with Synthelabo. Interest income
was $898,039, $1,200,921 and $1,011,251, for the years 1996, 1995 and 1994
respectively. Interest income for the year 1995 was significantly higher over
1994 due to funds received in conjunction with the Synthelabo agreement and
EISAI and generally higher interest rates. From 1995 to 1996, interest income
declined approximately $300,000 due to lower average invested balances and a
general decline in interest rates.

    Total operating expenses increased 20% from $22,347,974 in 1995 to
$26,740,565 in 1996 and 16% from $19,332,414 in 1994 to $22,347,974 in 1995.
The Company recorded noncash charges for the purchase of in-





                                       17
<PAGE>   18
process research and development of $2,061,383 and $6,404,227 during 1995 and
1994, respectively.  The Company impaired the remaining goodwill, $643,750, at
December 31, 1995, associated with the IPI purchase due to the expected
consolidation of IPI operations into TBC's in the first half of 1996 and
charged $421,165 to expense during 1996 costs related to restructuring IPI.
The change in operating expenses would have been 34% and 52% for the years 1995
to 1996 and 1994 to 1995 respectively, without these charges. The increase from
1995 to 1996 was primarily due to increases related to the costs associated
with the clinical trials of NOVASTAN(R). The increase from 1994 to 1995 was
primarily due to inclusion of a full year of costs for IPI and increased costs
associated with the clinical trials of NOVASTAN(R). The Company had 73
employees at December 31, 1996, 98 at December 31, 1995 of which 25 were IPI
employees, and 97 at December 31, 1994, of which 35 were IPI employees.

    Research and development expenses increased 49% from $14,949,822 in 1995 to
$22,251,895 in 1996 and 67% from $8,936,004 in 1994 to $14,949,822 in 1995
without including the noncash charge for purchase of in-process research and
development of $6,404,227 and $1,000,000 for the years 1995 and 1994,
respectively. The increase from 1996 to 1995 was primarily due to the increase
in clinical development expenses related to the ongoing clinical trials of
NOVASTAN(R). The increase from 1994 to 1995 was primarily due to inclusion of
a full year of costs for IPI and increased costs associated with the clinical
trials of NOVASTAN(R).

    General and administrative expenses decreased 13% from $4,693,019 in 1995
to $4,067,505 in 1996 and increased 18% from $3,992,183 in 1994 to $4,693,019
in 1995. The decrease in 1996 was primarily due to the restructuring of IPI and
the related decrease in general and administrative expenses. In addition,
legal expense decreased approximately $300,000 due primarily to lower
litigation expense in 1996. The increase in 1995 was primarily due to a full
year of IPI's general and administrative expenses of $814,724 and legal
expenses related to shareholder lawsuits and patent applications for TBC's
compounds.

    Rent and related expense, which is a component of both research and
development and general and administrative expense was approximately $1,025,000
in 1996, $1,218,000 in 1995 and $1,416,000 in 1994. The decrease of
approximately $193,000 in 1996 from 1995 was due to decreases in leased space
at IPI and credits applied to the Houston space due to the lease renegotiation.
The decrease of approximately 198,000 from 1994 to 1995 was a net of higher
rent due to a full year of rent from IPI office and lab space and lower rent
and utilities for the Houston space due to renegotiation of the lease.

    The Company incurred net losses of $20,436,750, $13,914,119 and $13,603,693
for the years ended December 31, 1996, 1995 and 1994, respectively.

                        LIQUIDITY AND CAPITAL RESOURCES

    The Company has financed its research and development activities to date
principally through (i) private sales of common stock and an initial public
offering of a unit security, (ii) issuances of common stock in conjunction with
assumption of liabilities and assets to acquire IPI and the NOVASTAN(R)
license, (iii) revenues from research and collaborative agreements and (iv)
investment income, net of interest expense.

    The Company expects to incur substantial research and development
expenditures as it designs and develops biopharmaceutical products for the
prevention and treatment of cardiovascular diseases. The Company anticipates
that operating expenses will continue to increase during 1997 and subsequent
years. The Company began to incur costs to develop NOVASTAN(R) during the
third quarter of 1993. These costs will continue during 1997 due to the
continuation of clinical trials and will continue to be significant through the
FDA approval process and additional clinical trial work for other clinical
indications. These costs include, among other things, hiring personnel to
direct and carry out all operations related to the clinical trials, paying for
hospital and procedural costs, services of a contract research organization,
and purchasing and formulating large quantities of the compound to be used in
such trials. In addition, the Company anticipates that the administrative
costs associated with this effort will be significant. The amounts and timing
of expenditures will depend on the progress of ongoing research and clinical
development and product launch costs.





                                       18
<PAGE>   19
    At December 31, 1996 and December 31, 1995, the Company had cash, cash
equivalents and short-term investments of approximately $13.4 million and $13.9
million, respectively. In February 1996, the Company completed a private
placement offering with net proceeds of approximately $13.0 million. The
Company consolidated the IPI operations into TBC's during 1996, which had a
positive impact on liquidity. The Company anticipates that its existing
capital resources should be sufficient to fund its cash requirements into the
third quarter of 1997. This date is contingent upon various factors, including
rate of patient enrollment and spending rate for the clinical trials of
NOVASTAN(R), Selectin and Endothelin compounds, and expenditures on research
and development of other compounds. However, the Company's existing capital
resources will not be sufficient to fund the Company's operations through
commercialization of its first product. Moreover, the Genentech and Synthelabo
Agreements require the Company to maintain a tangible net worth of at least
$5.0 million during the term of the Agreements. If the Company fails to
maintain the prescribed net worth or fails to exercise due diligence in
performing its obligations under the Genentech Agreement, Genentech may, at its
option, terminate the Genentech Agreement or cause the license to become
non-exclusive. For failure to maintain at least $5.0 million of net worth,
Synthelabo may require that the technology be transferred to, and the
development program be conducted by, a joint venture owned by TBC and
Synthelabo. The outcome of certain lawsuits that have been filed against the
Company could also have an impact on liquidity.

    The Company will need to raise substantial funds for future operations and
is actively seeking such funding through collaborative arrangements, public or
private financing, including equity financing, and other arrangements. The
Company expects that additional expenditures will be required if additional
product candidates enter clinical trials which may require additional
expenditures for laboratory space, scientific and administrative personnel, and
services of contract research organizations. There can be no assurance that
the Company will be able to obtain additional financing on acceptable terms or
in time to fund any necessary or desirable expenditures. In the event such
financing are not obtained, the Company's development and research projects
will be delayed or scaled back. See Item 3. Legal Proceedings.

                 HAZARDOUS MATERIALS AND ENVIRONMENTAL MATTERS

    The Company's research and development activities involve the controlled
use of hazardous and radioactive materials. The Company is subject to federal,
state, and local laws and regulations governing the use, manufacture, storage,
handling and disposal of such materials and certain waste products. Management
believes that the Company is in compliance with all such laws, regulations and
standards currently in effect and that the cost of compliance with such laws,
regulation, and standards will not have a material adverse effect on the
Company. The Company does not expect to incur any capital expenditures for
environmental control in the foreseeable future.

                    IMPACT OF INFLATION AND CHANGING PRICES

    The pharmaceutical research industry is labor intensive, and wages and
related expenses increase in inflationary periods. The lease of space and
related building services for the Houston facility contains a clause that
escalates rent and related services each year based on the increase in building
operating costs and the increase in the Houston Consumer Price Index,
respectively. To date, inflation has not had a significant impact on
operations.

                DISCLOSURE REGARDING FORWARD LOOKING STATEMENTS

    This Report includes "forward looking statements" within the meaning of
Section 27A of the Securities Act of 1933, as amended, and Section 21E of the
Securities Exchange Act of 1934, as amended. All statements other than
statements of historical fact included in this Report are forward looking
statements. Such forward looking statements include, without limitation,
statements under (a) "Part I - Business and Note 1 to the Financial Statements
- -- regarding TBC's expectations for future drug discovery and development and
related expenditures and regulatory filings and approvals (b) "Management's
Discussion and Analysis of Financial Condition and Results of Operations -
Liquidity and Capital Resources" - regarding TBC's estimate of sufficiency of
existing capital resources and ability to raise additional capital to fund cash
requirements for future operations. Although TBC believes that the
expectations reflected in such forward looking statements are reasonable, it
can give no assurance that such expectations reflected in such forward looking
statements will prove to have been correct. The ability to achieve





                                       19
<PAGE>   20
TBC's expectations is contingent upon a number of factors which include (i)
ongoing cost of research and development activities, (ii) cost of clinical
development of product candidates, (iii) attainment of research and clinical
goals of product candidates, (iv) timely approval of TBC's product candidates
by appropriate governmental and regulatory agencies, (v) effect of any current
or future competitive products, (vi) ability to manufacture and market products
commercially,  (vii) retention of key personnel and (viii) obtaining and timing
of sufficient financing through capital raising or collaborative agreements to
fund operations.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

    The financial statements of the Company required to be included in this
Item 8 are set forth in Item 14 of this Report.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE

    Not applicable.





                                       20
<PAGE>   21
                                    PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

    The directors and executive officers of the Company are as follows:

<TABLE>
<CAPTION>
                 NAME                    AGE              POSITION
                 ----                    ---              --------
<S>                                      <C>  <C>
John M. Pietruski (1)(2)  . . . . . .    64   Chairman of the Board of Directors
David B. McWilliams (1) . . . . . . .    53   President, Chief Executive Officer 
                                              and Director
Richard A. F. Dixon, Ph.D. (1)  . . .    43   Vice President of Research and Director
Stephen L. Mueller  . . . . . . . . .    49   Vice President of Administration, 
                                              Secretary and Treasurer Richard
P. Schwarz, Jr., Ph.D.  . . . . . . .    46   Vice President of Clinical and 
                                              Regulatory Affairs
Joseph M. Welch . . . . . . . . . . .    56   Vice President of Business Development
James T. Willerson, M.D. (1)(2) . . .    57   Chairman of the Scientific Advisory 
                                              Board and Director
Patrick Owen Burns (2)  . . . . . . .    59   Director
Frank C. Carlucci (3) . . . . . . . .    66   Director
Robert J. Cruikshank (3)  . . . . . .    66   Director
James A. Thomson, Ph.D. (3) . . . . .    52   Director
</TABLE>

- ---------------
(1) Member, Executive Committee of the Board of Directors
(2) Member, Compensation and Personnel Committee of the Board of Directors
(3) Member, Audit Committee of the Board of Directors

      The additional information requested by this item will be contained in
the Company's definitive Proxy Statement ("Proxy Statement") for its 1997
Annual Meeting of Stockholders to be held on May 6, 1997 and is incorporated by
reference from the sections titled "Election of Directors" and "Executive
Officers".  Such Proxy Statement will be filed with the Securities and Exchange
Commission not later than 120 days subsequent to December 31, 1996.

ITEM 11. EXECUTIVE COMPENSATION

      The information requested by this item is incorporated by reference from
the section titled "Executive Compensation" in the Company's definitive Proxy
Statement for the Annual Meeting of Stockholders to be held on May 6, 1997.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

      The information requested by this item is incorporated by reference from
the section titled "Principal Stockholders" in the Company's definitive Proxy
Statement for the Annual Meeting of Stockholders to be held on May 6, 1997.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

      The information requested by this item is incorporated by reference from
the sections titled "Principal Stockholders," "Compensation Committee
Interlocks and Insider Participation," "Director Compensation", "Employment
Agreements" and "Certain Transactions" in the Company's definitive Proxy
Statement for the Annual Meeting of Stockholders to be held on May 6, 1997.





                                       21
<PAGE>   22
                                    PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

    (A)  1.    INDEX TO FINANCIAL STATEMENTS

         Reference is made to the Consolidated Financial Statements, the
         reports thereon, and the notes thereto commencing at Page F-1 of this
         Annual Report on Form 10-K.  Set forth below is an index to such
         Financial Statements and Schedules.

<TABLE>
<CAPTION>
                                                                                 PAGE
                                                                                 ----
         <S>                                                                      <C>
         Independent Auditors' Report                                             F-1

         Consolidated Balance Sheets as of December 31, 1996 and 1995             F-2

         Consolidated Statements of Operations for the years ended December 31,
         1996, 1995 and 1994, and the period from August 2, 1989 (date of
         incorporation) to December 31, 1996                                      F-3

         Consolidated Statements of Stockholders' Equity for the period from
         August 2, 1989 (date of incorporation) to December 31, 1996              F-4

         Consolidated Statements of Cash Flows for the years ended
         December 31, 1996, 1995 and 1994, and the period from August 2, 1989
         (date of incorporation) to December 31, 1996                             F-7

         Notes to Consolidated Financial Statements                               F-8
</TABLE>

         2.    INDEX TO EXHIBITS

         Information with respect to this Item is contained in the attached
         Index to Exhibits.

         The Company will furnish a copy of any one or more of these exhibits
         to a shareholder who so requests upon receipt of payment for the cost
         of duplication and mailing the requested items.

    (B)  REPORTS ON FORM 8-K:

    No reports on Form 8-K filed during the quarter ended December 31, 1996.

    All schedules have been omitted since the information is not required or is
    not material to require submission of the schedule, or because the
    information is included in the financial statements or notes thereto.





                                     22
<PAGE>   23



                                   SIGNATURES

      PURSUANT TO THE REQUIREMENTS OF SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934, THE REGISTRANT HAS DULY CAUSED THIS REPORT TO BE SIGNED
ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE CITY OF
HOUSTON AND STATE OF TEXAS ON THE 11TH DAY OF MARCH, 1997.

                                   TEXAS BIOTECHNOLOGY CORPORATION

                                   By:  /s/  STEPHEN L. MUELLER
                                       ---------------------------------------
                                            Stephen L. Mueller
                                            Vice President of Administration,
                                            Secretary and Treasurer



      PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF 1934, THIS
REPORT HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS AND IN THE CAPACITIES
INDICATED ON THE 11TH DAY OF MARCH, 1997.



<TABLE>
<CAPTION>

  SIGNATURE                           TITLE
  ---------                           -----
  <S>                                 <C>

  /s/  JOHN M. PIETRUSKI              Chairman of the Board of Directors
  ---------------------------
       John M. Pietruski


  /s/  DAVID B. MCWILLIAMS            Director, President and Chief Executive Officer
  ---------------------------         (Principal Executive Officer)
       David B. McWilliams               
                                                                   
                                      
  /s/  RICHARD A.F. DIXON             Director and Vice President of Research
  ---------------------------
       Richard A.F. Dixon               
                                      
                                      
  /s/  STEPHEN L. MUELLER             Vice President of Administration,
  ---------------------------         Secretary and Treasurer
       Stephen L. Mueller             (Principal Financial and Accounting Officer)              
                                                             
                                      
  /s/  PATRICK OWEN BURNS             Director
  ---------------------------
       Patrick Owen Burns               
                                      
                                      
  /s/  FRANK C. CARLUCCI              Director
  ---------------------------
       Frank C. Carlucci                
                                      
                                      
  /s/  ROBERT J. CRUIKSHANK           Director
  ---------------------------
      Robert J. Cruikshank            
                                      
                                      
  /s/  JAMES A. THOMSON               Director
  ---------------------------
       James A. Thomson               
                                      
                                      
  /s/  JAMES T. WILLERSON             Director
  ---------------------------
       James T. Willerson    
</TABLE>
                                      


                                      23
<PAGE>   24





                          Independent Auditors' Report





The Board of Directors
Texas Biotechnology Corporation:


We have audited the accompanying consolidated balance sheets of Texas
Biotechnology Corporation and subsidiary (a development stage enterprise) (the
Company) as of December 31, 1996 and 1995, and the related consolidated
statements of operations, stockholders' equity, and cash flows for each of the
years in the three-year period ended December 31, 1996, and for the period from
August 2, 1989 (date of incorporation) to December 31, 1996.  These
consolidated financial statements are the responsibility of the Company's
management.  Our responsibility is to express an opinion on these consolidated
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 the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement.  An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements.  An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation.  We believe that our audits provide a reasonable basis
for our opinion.

In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the financial position of Texas Biotechnology
Corporation and subsidiary (a development stage enterprise) as of December 31,
1996 and 1995, and the results of their operations and their cash flows for
each of the years in the three-year period ended December 31, 1996, and for the
period from August 2, 1989 (date of incorporation) to December 31, 1996, in
conformity with generally accepted accounting principles.





                                        KPMG PEAT MARWICK LLP


Houston, Texas
February 21, 1997


                                      F-1
<PAGE>   25
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                          CONSOLIDATED BALANCE SHEETS


<TABLE>
<CAPTION>
                                                                                 DECEMBER 31,      DECEMBER 31,
                                                                                    1996              1995
                                    ASSETS                                       ------------      -----------
      
<S>                                                                              <C>               <C>
Current assets:                                                                                 
    Cash and cash equivalents                                                    $ 2,127,999        5,724,264  
    Short term investments                                                        11,262,292        8,195,307  
    Short term note receivable (note 13)                                             122,500          122,500  
    Prepaids                                                                         546,752          554,208  
    Other current assets                                                             602,975          547,391  
                                                                                  ----------       ----------
        Total current assets                                                      14,662,518       15,143,670  

                                                                                                               
Equipment and leasehold improvements, at cost less                                                             
    accumulated depreciation and amortization (note 5)                             3,458,012        3,782,829  
                                                                                                               
Other assets                                                                          59,591              --  
                                                                                 -----------       ----------
       Total assets                                                              $18,180,121       18,926,499  
                                                                                 ===========       ==========                       
                     LIABILITIES AND STOCKHOLDERS' EQUITY
                                                                                                               
Current liabilities:                                                                                           
    Accounts payable                                                             $ 1,661,339        1,370,708  
    Accrued expenses                                                               2,266,376        1,195,556  
    Deferred revenue (note 8)                                                        625,000          650,110
                                                                                 -----------       ----------
       Total current liabilities                                                   4,552,715        3,216,374  

Commitments and contingencies (notes 6, 7, 8, 9, 12 and 14)

Stockholders' equity (notes 2, 3 and 6):
    Preferred stock, par value $.005 per share.  At December 31, 1996
       and 1995, 5,000,000 shares authorized; none outstanding                           --              --
    Common stock, par value $.005 per share.  At December 31, 1996,
       75,000,000 shares authorized; 25,490,269 shares issued and
       outstanding.  At December 31, 1995, 40,000,000 shares authorized;
       17,439,365 shares issued and outstanding                                      127,451           87,198
    Additional paid-in capital                                                    77,808,331       59,540,730
    Deferred compensation expense                                                        --           (46,177)
    Deficit accumulated during the development stage                             (64,308,376)     (43,871,626)
                                                                                 -----------       ----------
       Total stockholders' equity                                                 13,627,406       15,710,125
                                                                                 -----------       ----------
       Total liabilities and stockholders' equity                                $18,180,121       18,926,499
                                                                                 ===========       ==========
</TABLE>


         See accompanying notes to consolidated financial statements


                                     F-2
<PAGE>   26
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                     CONSOLIDATED STATEMENTS OF OPERATIONS

        For the years ended December 31, 1996, 1995 and 1994, and the
   period from August 2, 1989 (date of incorporation) to December 31, 1996


<TABLE>
<CAPTION>
                                                                                             AUGUST 2, 1989
                                                                                               (DATE OF
                                                                                              INCORPORATION)
                                                                                                  TO
                                                                                              DECEMBER 31,
                                                   1996             1995          1994            1996
                                                 -----------     ---------      ---------     -------------
<S>                                               <C>            <C>           <C>            <C>
Revenues:
   Research agreements (note 8)                  $ 5,395,110     6,788,357      4,250,329        16,433,796
   Products and services                               8,939       217,707        178,934           405,580
   Grant revenue                                       1,727       227,938        289,522           668,951
                                                 -----------    ----------     ----------        ----------
      Total revenues                               5,405,776     7,234,002      4,718,785        17,508,327
                                                 -----------    ----------     ----------        ----------

Expenses:
   Research and development                       22,251,895    14,949,822      8,936,004        55,839,550
   Charge for purchase of in-process research                                                              
      and development (notes 9 and 14)                    --     2,061,383      6,404,227         9,465,610
   General and administrative                      4,067,505     4,693,019      3,992,183        19,472,139
   Restructuring & Impairment charges (note 14)      421,165       643,750             --         1,064,915
                                                 -----------    ----------     ----------        ----------
      Total expenses                              26,740,565    22,347,974     19,332,414        85,842,214
                                                 -----------    ----------     ----------        ----------
                                                                                                           
      Operating loss                              21,334,789    15,113,972     14,613,629        68,333,887
                                                 -----------    ----------     ----------        ----------
Other income (expense):                                                                                    
   Interest income                                   898,039     1,200,921      1,011,251         4,117,158
   Interest expense                                       --        (1,068)        (1,315)          (91,647
                                                 -----------    ----------     ----------        ----------
      Total other income (expense)                   898,039     1,199,853      1,009,936         4,025,511
                                                                                                           
      Net loss                                   $20,436,750    13,914,119     13,603,693        64,308,376
                                                 ===========    ==========     ==========        ==========
                                                                                                           
Net loss per share                               $      0.87          0.83           0.97              6.14
                                                 ===========    ==========     ==========        ==========
                                                                                                           
Weighted average common shares used to compute                                                             
   net loss per share                             23,616,033    16,748,995     14,018,269        10,470,502
                                                 ===========    ==========     ==========        ==========
</TABLE>


         See accompanying notes to consolidated financial statements


                                      
                                     F-3
<PAGE>   27
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

   For the period August 2, 1989 (date of incorporation) to December 31, 1996


<TABLE>
<CAPTION>
                                                                                                         DEFICIT
                                                  COMMON STOCK                                         ACCUMULATED
                                          -------------------------     ADDITIONAL       DEFERRED       DURING THE
                                             SHARES                      PAID-IN       COMPENSATION     DEVELOPMENT
                                             ISSUED        AMOUNT        CAPITAL         EXPENSE          STAGE            TOTAL
                                          -----------   -----------    ------------    ------------    ------------    ------------
<S>                                       <C>           <C>            <C>               <C>           <C>             <C>       
Issuance of shares for cash pursuant to
    subscription agreements between
    March and April 1990                   1,885,700    $     9,428          56,572            --              --            66,000
Repurchase and retirement of
    shares (note 2)                         (107,140)          (536)         (3,214)           --              --            (3,750)
Net loss                                        --             --              --              --          (692,951)       (692,951)

                                         -----------    -----------    ------------    ------------    ------------    ------------
    Balance at December 31, 1990           1,778,560    $     8,892          53,358            --          (692,951)       (630,701)
                                         -----------    -----------    ------------    ------------    ------------    ------------

Issuance of shares upon conversion of
    notes payable and accrued interest
    to stockholders and related trusts       554,355          2,772       1,937,483            --              --         1,940,255
Issuance of common stock and
    warrants through private
    placement, net of expenses             6,302,314         31,512      19,310,948            --              --        19,342,460
Net loss                                        --             --              --              --        (1,799,746)     (1,799,746)

                                         -----------    -----------    ------------    ------------    ------------    ------------
    Balance at December 31, 1991           8,635,229    $    43,176      21,301,789            --        (2,492,697)     18,852,268
                                         -----------    -----------    ------------    ------------    ------------    ------------

Net loss                                        --             --              --              --        (4,532,623)     (4,532,623)

                                         -----------    -----------    ------------    ------------    ------------    ------------
    Balance at December 31, 1992           8,635,229    $    43,176      21,301,789            --        (7,025,320)     14,319,645
                                         -----------    -----------    ------------    ------------    ------------    ------------

Issuance of shares related to Genentech
    license acquisition                      285,714          1,429         998,571            --              --         1,000,000
Issuance of shares pursuant to research
    and consulting agreements                  6,999             35          24,465            --              --            24,500
Deferred compensation expense                   --             --           287,158        (287,158)           --              --
Compensation expense related to certain
    stock options                               --             --              --            52,265            --            52,265
Issuance of common stock, warrants
    and underwriter's purchase options
    through initial public offering,
    net of expenses                        3,550,000         17,750      21,001,399            --              --        21,019,149
Net loss                                        --             --              --              --        (9,328,494)     (9,328,494)

                                         -----------    -----------    ------------    ------------    ------------    ------------
    Balance at December 31, 1993,
      carry forward                       12,477,942    $    62,390      43,613,382        (234,893)    (16,353,814)     27,087,065
                                         -----------    -----------    ------------    ------------    ------------    ------------
</TABLE>



          See accompanying notes to consolidated financial statements

                                      F-4
<PAGE>   28
               TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY, CONTINUED

<TABLE>
<CAPTION>
                                                                                                         DEFICIT
                                                    COMMON STOCK                                        ACCUMULATED
                                            -------------------------     ADDITIONAL     DEFERRED       DURING THE
                                               SHARES                      PAID-IN     COMPENSATION     DEVELOPMENT
                                               ISSUED        AMOUNT        CAPITAL       EXPENSE          STAGE            TOTAL
                                            -----------   -----------   ------------   ------------    ------------    ------------
<S>                                          <C>          <C>             <C>              <C>          <C>              <C>       
    Balance at December 31, 1993,
      brought forward                        12,477,942   $    62,390     43,613,382       (234,893)    (16,353,814)     27,087,065
                                            -----------   -----------   ------------   ------------    ------------    ------------

Issuance of shares related to
    initial public offering
    overallotment                               532,500         2,663      3,206,002           --              --         3,208,665
Issuance of common stock to former
    ImmunoPharmaceutics'
    shareholders                              1,599,958         8,000      5,799,848           --              --         5,807,848
Issuance of common stock to former
    ImmunoPharmaceutics'
    shareholders held in escrow                 999,956          --             --             --              --              --
Issuance of shares for common
    stock option exercise                           477             2          1,667           --              --             1,669
Issuance of common stock to
    Synthelabo for cash, net of
    expenses                                  1,428,571         7,143      4,952,948           --              --         4,960,091
Compensation expense related to
     stock options                                 --            --             --           95,951            --            95,951
Net loss                                           --            --             --             --       (13,603,693)    (13,603,693)
                                            -----------   -----------   ------------   ------------    ------------    ------------

    Balance at December 31, 1994             17,039,404   $    80,198     57,573,847       (138,942)    (29,957,507)     27,557,596
                                            -----------   -----------   ------------   ------------    ------------    ------------

Issuance of common stock to former
    ImmunoPharmaceutics'
    shareholders held in escrow                    --           5,000      1,404,938           --              --         1,409,938
Issuance of common stock to former
    ImmunoPharmaceutics'
    shareholders pursuant to issue rights       399,961         2,000        561,945           --              --           563,945
Compensation expense related to
     stock options                                 --            --             --           92,765            --            92,765
Net loss                                           --            --             --             --       (13,914,119)    (13,914,119)
                                            -----------   -----------   ------------   ------------    ------------    ------------
    Balance at December 31, 1995,
      carryforward                           17,439,365   $    87,198     59,540,730        (46,177)    (43,871,626)     15,710,125
                                            -----------   -----------   ------------   ------------    ------------    ------------
</TABLE>
                                             



          See accompanying notes to consolidated financial statements

                                      F-5

<PAGE>   29

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY, CONTINUED

<TABLE>
<CAPTION>
                                                                                                         DEFICIT
                                                    COMMON STOCK                                        ACCUMULATED
                                            -------------------------     ADDITIONAL     DEFERRED       DURING THE
                                               SHARES                      PAID-IN     COMPENSATION     DEVELOPMENT
                                               ISSUED        AMOUNT        CAPITAL       EXPENSE          STAGE            TOTAL
                                            -----------   -----------   ------------   ------------    ------------    ------------
<S>                                          <C>          <C>             <C>              <C>          <C>              <C>       

    Balance at December 31, 1995,
      brought forward                        17,439,365   $    87,198     59,540,730        (46,177)    (43,871,626)     15,710,125
                                            -----------   -----------   ------------   ------------    ------------    ------------

Issuance of common stock and
    warrants through private
    placement, net of expenses                6,550,990        32,754     12,958,327           --              --        12,991,081
Issuance of common stock for
    stock option exercises                      192,640           963        590,092           --              --           591,055
Issuance of common stock for
    warrant exercises                            57,274           286        200,173           --              --           200,459
Issuance of common stock to
    LG Chem for cash, net of
    expenses                                  1,250,000         6,250      4,519,009           --              --         4,525,259
Compensation expense related to
     stock options                                 --            --             --           46,177            --            46,177
Net loss                                           --            --             --             --       (20,436,750)    (20,436,750)
                                            -----------   -----------   ------------   ------------    ------------    ------------

    Balance at December 31, 1996             25,490,269   $   127,451     77,808,331           --       (64,308,376)     13,627,406
                                            ===========   ===========   ============   ============    ============    ============
</TABLE>




          See accompanying notes to consolidated financial statements

                                      F-6

<PAGE>   30
                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                     CONSOLIDATED STATEMENTS OF CASH FLOWS

           For the years ended December 31, 1996, 1995 and 1994, and
  the period from August 2, 1989 (date of incorporation) to December 31, 1996

<TABLE>
<CAPTION>
                                                                                                                  AUGUST 2, 1989
                                                                                                                    (DATE OF
                                                                                                                  INCORPORATION)
                                                                                                                       TO
                                                                                                                  DECEMBER 31,
                                                                      1996            1995            1994            1996
                                                                  ------------    ------------    ------------    ------------
<S>                                                               <C>              <C>             <C>             <C>         
CASH FLOWS FROM OPERATING ACTIVITIES:
   Net loss                                                       $(20,436,750)    (13,914,119)    (13,603,693)    (64,308,376)
   Adjustments to reconcile net loss to net cash
     used in operating activities:
           Write-off of deferred offering costs related
                 to delayed offering                                    24,140            --              --           349,078
           Depreciation and amortization                               759,328         800,614       1,098,602       4,612,167
           Interest expense converted on notes payable
                 to stockholders                                          --              --              --            87,755
           Non cash acquisition costs expensed (notes 9 and 14)           --         2,061,383       6,404,227       9,465,610
           Expenses paid with stock                                       --              --              --            24,500
           Deferred compensation expense                                46,177          92,765          95,951         287,158
           Loss on disposition of fixed assets                           7,056            --              --             7,056
           Impairment of intangible assets                                --           643,750            --           643,750
   Change in operating assets and liabilities, net of
     effect of acquisition:
     (Increase) decrease in prepaids                                     7,456        (108,799)        (15,031)       (369,094)
     (Increase) decrease in receivables                                   --            71,843        (125,064)        (90,286)
     (Increase) in other current assets                                (55,584)       (219,601)       (435,682)       (710,867)
     (Increase) in other assets                                        (33,594)           --              --           (33,594)
     Decrease in inventories                                              --            59,118           2,127          61,245
     (Decrease) increase in current liabilities                      1,361,451       2,010,466        (419,508)      3,861,599
     Increase (decrease) in deferred revenue                           (25,110)     (2,428,841)      1,406,829      (1,047,122)
                                                                  ------------    ------------    ------------    ------------
           Net cash used in operating activities                   (18,345,430)    (10,931,421)     (5,591,242)    (47,159,421)
                                                                  ------------    ------------    ------------    ------------

CASH FLOWS FROM INVESTING ACTIVITIES:
   Purchases of equipment and leasehold improvements                  (494,965)       (199,750)     (1,169,128)     (7,715,920)
   Proceeds from disposition of fixed assets                            27,400            --              --            27,400
   Purchase of short term investments                              (31,176,391)    (23,448,580)    (28,472,640)    (83,097,611)
   Maturity of short term investments                               28,109,406      33,104,073      10,621,840      71,835,319
   Acquisition of subsidiary, net of cash acquired                        --              --          (167,331)       (167,331)
                                                                  ------------    ------------    ------------    ------------
          Net cash provided by (used in) investing activities       (3,534,550)      9,455,743     (19,187,259)    (19,118,143)
                                                                  ------------    ------------    ------------    ------------

CASH FLOWS FROM FINANCING ACTIVITIES:
   Proceeds from notes payable to stockholders and
     related trusts (note 2)                                              --              --              --         1,852,500
   Proceeds from sale of common stock and warrants, net             18,307,855            --         8,170,427      66,905,891
   Repurchase of common stock                                             --              --              --            (3,750)
   Cost of delayed offering                                            (24,140)           --              --          (349,078)
                                                                  ------------    ------------    ------------    ------------
           Net cash provided by financing activities                18,283,715            --         8,170,427      68,405,563
                                                                  ------------    ------------    ------------    ------------

     Net increase (decrease) in cash and cash equivalents           (3,596,265)     (1,475,678)    (16,608,074)      2,127,999

Cash and cash equivalents at beginning of period                     5,724,264       7,199,942      23,808,016            --
                                                                  ------------    ------------    ------------    ------------

Cash and cash equivalents at end of period                        $  2,127,999       5,724,264       7,199,942       2,127,999
                                                                  ============    ============    ============    ============

Supplemental schedule of noncash financing activities
   (see notes 2, 9 and 14)                                        $       --         2,061,383       6,404,227      11,405,865
                                                                  ============    ============    ============    ============
</TABLE>



          See accompanying notes to consolidated financial statements

                                      F-7
<PAGE>   31
               TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                      (A DEVELOPMENT STAGE ENTERPRISE)

                 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



(1)   ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES

      (a)    Organization

             Texas Biotechnology Corporation (the "Company" or "TBC"), a
             biopharmaceutical company, applies innovative drug discovery
             techniques and its specialized knowledge of the role of vascular
             cell biology in cardiovascular disease to the design and
             development of novel pharmaceutical compounds.  The Company was
             incorporated in the state of Delaware in 1989.

             During the period from August 2, 1989, (date of incorporation)
             through March 1990, the Company was largely inactive.  Since that
             time, the Company has been engaged principally in research and
             drug discovery programs and clinical development of a drug
             compound.  On July 25, 1994, the Company acquired all of the
             outstanding common stock of ImmunoPharmaceutics, Inc. ("IPI"), a
             San Diego, California based company, in exchange for common stock
             of the Company.  TBC consolidated the IPI operation into TBC in
             the first half of 1996. (See note 14)

             The Company is presently working on a number of long-term
             development projects which involve experimental and unproven
             technology, which may require many years and substantial
             expenditures to complete, and which may be unsuccessful.  To date,
             other than small amounts of monoclonal antibody compounds and
             services produced and sold by IPI (now discontinued), the Company
             has not developed or sold any products, and no assurance can be
             given that the Company will be able to develop, manufacture or
             market any products in the future.  In addition, no assurance
             exists that future revenues will be significant, that any sales
             will be profitable, or that the Company will have sufficient funds
             available to complete its research and development programs or
             market any products which it may develop.  Accordingly, the
             Company is considered to be in the development stage as it has not
             to date derived significant revenues from its planned principal
             operations.

      (b)    Basis of Consolidation

             The Company's consolidated financial statements include the
             accounts of the Company and its wholly owned subsidiary, IPI.  All
             material intercompany transactions have been eliminated.  The
             Company's consolidated financial statements include the activity
             related to IPI since August 1, 1994.

      (c)    Cash, Cash Equivalents and Short Term Investments

             Cash equivalents are considered to be those securities or
             instruments with original maturities, when purchased, of three
             months or less.  At December 31, 1996, approximately $1,643,000
             was invested in demand and money market accounts.  Short term
             investments are those investments which have an original maturity
             of less than one year and greater than three months.  At December
             31, 1996, the Company's short term investments consisted of
             approximately $998,000 in U.S. Treasury Bills and $10,264,000 in
             Corporate Commercial Paper.  Cash equivalents and short term
             investments are stated at cost, which approximates market value.
             Interest income is accrued as earned.

             On January 1, 1994, the Company adopted Statement of Financial
             Accounting Standards No. 115 (Statement 115), Accounting for
             Certain Investments in Debt and Equity Securities.  Statement 115
             provides for the use of the amortized cost method for investments
             in debt securities when management has the positive intent and



                                     F-8

<PAGE>   32

               TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                      (A DEVELOPMENT STAGE ENTERPRISE)

                 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





             ability to hold such securities to maturity.  In connection with
             the adoption of Statement 115, the Company classified all short
             term investments as held to maturity.

      (d)    Equipment and Leasehold Improvements

             Equipment and leasehold improvements are stated at cost less
             accumulated depreciation and amortization.  Depreciation of
             furniture and equipment is provided on the straight-line method
             over the estimated useful lives of the respective assets (3 to 10
             years).  Amortization of leasehold improvements is provided on the
             straight-line method over the remaining minimum lease term.

      (e)    Intangible Assets

             Intangible assets are amortized on a straight line basis over ten 
             years.

      (f)    Research and Development Costs

             All research and development costs are expensed as incurred and
             include salaries of research and development employees.  For the
             years ended December 31, 1996, 1995, 1994 and the period from
             August 2, 1989 (date of incorporation) through December 31, 1996,
             salaries and benefits totaled approximately $6,233,000,
             $7,005,000, $4,841,000 and $23,286,000, respectively, of which
             approximately $4,893,000, $5,612,000, $3,420,000 and $16,946,000,
             respectively, was charged to research and development.  Payments
             related to the acquisition of in-process research and development
             are expensed.

      (g)    Net Loss Per Share

             Net loss per share is calculated using the weighted average shares
             of common stock outstanding during the period.  For the years ended
             December 31, 1996, 1995, 1994 and the period from August 2, 1989
             (date of incorporation) through December 31, 1996, the weighted
             average common shares used to compute net loss per share totaled
             23,616,033, 16,748,995, 14,018,269 and 10,470,502, respectively.
             Stock options and stock warrants are considered common stock
             equivalents, however they are not included in the loss per share
             computations as their effect is anti-dilutive. Shares held in
             escrow through June 30, 1995, pending satisfaction of certain
             future conditions, and shares related to contingent stock issue
             rights related to the IPI acquisition have been excluded from the
             net loss per share calculation until such shares were released or
             issued.

      (h)    Reclassifications

             Certain reclassifications have been made to prior period financial
             statements to conform with the December 31, 1996 presentation with
             no effect on net loss reported.

      (i)    Revenue Recognition

             Revenue from grants is recognized as earned under the terms of the
             related grant agreements.  Revenue from service contracts is
             recognized as the services are performed and/or as milestones are
             achieved.  Revenue from products and services is recognized when
             the products are shipped or the services are performed.  Amounts
             received in advance of services to be performed under contracts
             are recorded as deferred revenue.





                                      F-9
<PAGE>   33

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      (j)    Patent Application Costs

             Costs incurred in filing for patents are expensed as incurred.

      (k)    Use of Estimates

             Management of the Company has made a number of estimates and
             assumptions relating to the reporting of assets and liabilities
             and the disclosure of contingent assets and liabilities to prepare
             these consolidated financial statements in conformity with
             generally accepted accounting principles.  Actual results could
             differ from these estimates.

      (l)    Accounting Pronouncements

             In March 1995, the Financial Accounting Standards Board issued
             Statement No. 121, "Accounting for the Impairment of Long-Lived
             Assets and for Long-Lived Assets to Be Disposed Of" (Statement
             121).  The Company has adopted the statement effective December
             31, 1995.  Statement 121 requires that long-lived assets and
             certain identifiable intangible assets to be held and used by an
             entity be reviewed for impairment whenever events or changes in
             circumstances indicate that the carrying amount of an asset may
             not be recoverable.  In addition, Statement 121 requires that
             certain long-lived assets and certain identifiable intangible
             assets to be disposed of be reported at the lower of carrying
             amount or fair value less costs to sell.  The Company believes the
             goodwill associated with IPI, $643,750, is impaired due to the
             decision to cease operations at IPI and the sale of the QED
             business unit and has recorded a charge to expense during 1995.
             (See note 14)

             In October 1995, the Financial Accounting Standards Board issued
             Statement No. 123, "Accounting for Stock-Based Compensation"
             (Statement 123).  Statement 123 establishes financial accounting
             and reporting standards for stock-based employee compensation
             plans using a fair value based methodology as an alternative to
             intrinsic value based methodology.  In addition, Statement 123
             establishes the fair value as the measurement basis for
             transactions in which an entity issues its equity instruments to
             acquire goods or services from non-employees.  The accounting and
             reporting requirements of  Statement 123 are effective beginning
             January 1, 1996.  The Company continues to use the intrinsic value
             method.  (See Note 3)

(2)   CAPITAL STOCK

      At December 31, 1996, the Company's authorized capital stock consisted of
      75,000,000 shares of common stock, (in May 1996, the Board of Directors
      proposed, and stockholders approved, an amendment to the Company's
      Certificate of Incorporation to increase the authorized number of shares
      of the Company's common stock from 40 million shares to 75 million
      shares) par value $.005 per share, and 5,000,000 shares of preferred
      stock, par value $.005 per share, issuable in one or more series.  During
      March and April 1990, 1,885,700 shares of common stock were sold pursuant
      to subscription agreements for $.035 per share (initial offering).
      Certain stockholders sold a total of  107,140 shares back to the Company.
      In addition, certain employees and consultants who purchased stock were
      granted registration rights in certain circumstances, limited pre-emptive
      rights and limited rights of co-sale with two principal stockholders.

      During 1991, 6,302,314 shares of common stock were sold pursuant to a
      private placement.  Proceeds to the Company were approximately $19.3
      million, net of selling expenses.  The sales agent, D. Blech & Co. (whose
      sole stockholder was a principal stockholder of the Company), received
      approximately $2.3 million in commissions and





                                      F-10
<PAGE>   34

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      expense reimbursement, and purchased 629,566 warrants for $.035 each.
      Each warrant entitles the holder to purchase one share of common stock at
      $3.50 per share and expires between August 1, 1998 and October 25, 1998.
      The warrant holder has certain "piggy-back" and demand registration
      rights with respect to the warrants and underlying shares.  As of
      December 31, 1996, 261,599 of the 629,566 outstanding warrants for shares
      of stock were assigned to selected dealers who participated in the
      private placement and others.  A total of 57,274 warrants had been
      exercised as of December 31, 1996.

      Between December 1989 and July 1991, two principal stockholders (and
      certain related trusts) who were also members of the Board of Directors
      made loans to the Company totaling $1,852,500.  Notes were executed for
      the loans which carried mandatory conversion provisions.  At the time of
      the 1991 private placement, all principal and accrued interest, which
      totaled $1,940,255, was converted into 554,355 shares of Common Stock.

      During May, 1993, the Company issued 285,714 shares of common stock to
      Genentech, Inc. in connection with the Stock Agreement and Sublicense and
      License Agreement entered into with Genentech, Inc. on the same date.
      (See note 9)  In August, 1993, the Company issued 6,999 shares of common
      stock in connection with certain collaboration and consulting agreements.

      In December 1993, D. Blech & Company, Incorporated acted as underwriter
      for an initial public offering of Company securities.  Pursuant to this
      offering, 4,082,500 units were sold including the over-allotment, each
      unit consisting of one share of common stock (par value $.005 per share)
      and one warrant to purchase one share of common stock.  Proceeds to the
      Company were approximately $24.2 million, net of selling expenses of
      approximately $3.3 million.  The securities included in the unit were
      transferable only as a unit until November 7, 1994, at such time when the
      Company separated the unit into its common stock and warrant components.
      The warrants are exercisable at $8.44 per share and expire on December
      15, 1998. The warrants are redeemable for $.05 per warrant, at the option
      of the Company, upon 30 days' prior written notice at any time after the
      last sale price of the common stock has been at least $11.82 for 30
      consecutive business days ending within 15 days of the date of the notice
      of redemption.  All of the warrants must be redeemed if any are redeemed.
      The underwriter received approximately $2.9 million in commissions and
      expense reimbursement and purchased options to purchase 355,000 units at
      an exercise price of $11.14.  These options were sold for $.001 each and
      expire on December 15, 1998.

      In July, 1994, the Company acquired all of the outstanding common stock
      of IPI in exchange for common stock of the Company.  TBC issued (i)
      1,599,958 shares of common stock which was distributed to the existing
      IPI shareholders, (ii) 999,956 shares of common stock, issued in the
      names of IPI shareholders that were held in escrow pending satisfaction
      of certain research and development milestones and released from escrow
      on June 30, 1995, and (iii) contingent stock issue rights to issue an
      aggregate of 1,400,000 shares of common stock, the conversion of which is
      pending satisfaction of research and development milestones, in exchange
      for all the issued and outstanding shares of IPI.  On June 30, 1995, the
      Company issued 399,961 shares pursuant to the contingent stock issue
      rights, upon attainment of certain research and development milestones.
      In conjunction with the acquisition, in addition to granting piggyback
      registration rights under certain circumstances, the Company has filed a
      registration statement on Form S-3 covering the resale of the TBC common
      stock, which became effective on December 6, 1995.  (See note 14)

      In October, 1994, the Company signed a collaborative agreement with
      Synthelabo, a French pharmaceutical group.  In conjunction with the
      agreement, Synthelabo purchased 1,428,571 shares of common stock for
      $3.50 per share for a total of $5 million.  In addition, the Company has
      granted demand and piggyback registration rights with respect to such
      shares under certain circumstances.  (See note 8)





                                      F-11
<PAGE>   35

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      In February, 1996, the Company completed a private placement of common
      stock.  The Company issued 6,550,990 shares of Common Stock at $2 1/8 per
      share with proceeds of approximately $13.0 million, net of selling
      commissions and expenses of  approximately $900,000.  In accordance with
      the terms of the offering, the Company filed, pursuant to Rule 415 of the
      Securities Act, a Shelf Registration Statement as to the resale of the
      shares of Common Stock sold to the purchasers in the private placement
      which became effective on June 4, 1996.  In connection with the private
      placement, the co-exclusive agent, Harris, Webb & Garrison received a
      $634,630 selling commission, 49,775 warrants with an exercise price of
      $3.05 per share and no registration rights, and 497,749 warrants with an
      exercise price of $3.66 per share with the underlying common stock being
      registered, under certain circumstances, on a "piggyback" basis in the
      event of a public offering of common stock by the Company.  The
      co-exclusive agent, Aurora Capital Corp., received a $124,653 selling
      commission, 25,587 warrants with an exercise price of $3.36 per share,
      and 157,350 warrants, of which 8,348 were canceled pursuant to an
      agreement for services with one of the selected dealers, with an exercise
      price of $4.58 per share.  The common stock underlying Aurora's warrants
      were registered with the Common Stock issued in the private placement.
      The co-exclusive agents assigned some of these warrants to others.

      On October 10, 1996 the Company signed a strategic alliance agreement and
      common stock purchase with LG Chemical, Ltd. ("LG Chem"), a Korean
      corporation.  In conjunction with the agreement, LG Chem purchased
      1,250,000 shares of common stock for $4.00 per share for a total of $5
      million.  In addition, LG Chem has the option to purchase up to $5
      million of common stock on one of four exercise dates ending at December
      31, 1997.  The minimum purchase amount is $1,000,000 and LG Chem and TBC
      must agree on the purchase price or the option cannot be exercised on the
      given exercise date.  These shares were issued pursuant to "Regulation S"
      and may not be sold by LG Chem for a period of one year per the
      agreement.  The Company's agents in the contract negotiations received
      $420,000 in commissions and 113,636 warrants exercisable at $4.40 per
      share with the resale of the underlying common stock being subject to
      certain piggyback registration rights.

(3)   STOCK OPTIONS

      The Company has in effect the following stock option plans:

      The Amended and Restated 1990 Incentive Stock Option Plan ("1990 Plan")
      allows for the issuance of incentive and non-qualified options to
      employees, directors, officers, non-employee independent contractors and
      non-employee directors, pursuant to which 230,590 shares of common stock
      are reserved for issuance out of authorized but unissued shares of the
      Company.

      The Amended and Restated 1992 Incentive Stock Option Plan ("1992 Plan")
      allows for the issuance of incentive and non-qualified options to
      employees, directors, officers, non-employee independent contractors and
      non-employee directors, pursuant to which 1,562,008 shares of common
      stock are reserved for issuance out of authorized but unissued shares of
      the Company.

      The Stock Option Plan for Non-Employee Directors ("Director Plan") allows
      for the issuance of non-qualified options to non-employee directors,
      pursuant to which 71,429 shares of common stock are reserved for issuance
      out of authorized but unissued shares of the Company to be issued to
      non-employee members of the Board of Directors of the Company based on a
      formula.

      The 1995 Stock Option Plan ("1995 Plan") allows for the issuance of
      incentive and non-qualified options, shares of restricted stock and stock
      bonuses to employees, officers, and non-employee independent contractors,
      pursuant to which 1,000,000 shares of common stock are reserved for
      issuance out of authorized but unissued shares of the





                                      F-12
<PAGE>   36

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      Company.  The Board of Directors amended the 1995 Plan effective April 1,
      1997 to allow 2,000,000 shares to be reserved for issuance subject to the
      approval of stockholders at the annual meeting on May 6, 1997.

      The Amended and Restated 1995 Non-Employee Director Stock Option Plan
      ("1995 Director Plan") allows for the issuance of non-qualified options
      to non-employee directors, pursuant to which 200,000 shares of common
      stock are reserved for issuance out of authorized but unissued shares of
      the Company to be issued to non-employee members of the Board of
      Directors of the Company based on a formula.  In June 1996, the 1995
      Director Plan was amended with respect to the election date requirement
      for a director to request stock in lieu of cash payment of director fees.
      The Board of Directors amended the 1995 Director Plan effective April 1,
      1997 to allow 300,000 shares to be reserved for issuance subject to the
      approval of stockholders at the annual meeting on May 6, 1997.

      A summary of stock options as of December 31, 1996, follows:


<TABLE>
<CAPTION>
                           Exercise Price                                                                Available    
      Stock Option Plans      Per Share       Authorized      Outstanding     Exercised   Exercisable    for Grant    
      ------------------   --------------     ----------      -----------     ---------   -----------    ---------    
      <S>                   <C>               <C>              <C>            <C>         <C>            <C>          
      1990 Plan             $3.50 - $3.56        285,715          173,369        55,125       165,369       57,221    
                                                                                                                      
      1992 Plan             $1.41 - $5.36      1,700,000        1,305,513       137,992       683,794      256,495    
                                                                                                                      
      Director Plan         $2.40 - $4.54         71,429           42,576           ---        33,148       28,853    
                                                                                                                      
      1995 Plan             $1.31 - $4.38      1,000,000          564,500           ---        37,500      435,500    
                                                                                                                      
      1995 Director Plan    $1.38 - $5.19        200,000           82,806           ---        49,422      117,194    
                                               ---------        ---------       -------       -------      -------    
                    TOTALS                     3,257,144        2,168,764       193,117       969,233      895,263    
                                               =========        =========       =======       =======      =======
</TABLE>                              

      As of March 4, 1997, the Board of Directors approved increases in the
      number of shares authorized of 1,000,000 shares in the 1995 Plan and
      100,000 shares in the 1995 Director Plan respectively, subject to the
      approval of stockholders at the annual meeting on May 6, 1997.  See (note
      16)

      The Company applies APB Opinion 25 and related interpretations on
      accounting for its plans.  The Company has recorded deferred compensation
      for the difference between the grant price and the deemed fair value for
      financial statement presentation purposes related to certain options
      granted in the period subsequent to May 27, 1993 and prior to the initial
      public offering.  Such amount totaled $287,158, of which $92,765 was
      charged to expense in 1995.  The unamortized deferred compensation
      expense of $46,177 at December 31, 1995 was expensed during 1996.  Had
      compensation costs for the Company's stock-based compensation plans been
      determined consistent with SFAS No.  123, the Company's proforma net loss
      and proforma net loss per share for the year ended December 31, 1996
      would have been $21,057,088 and $0.89, respectively and for December 31,
      1995 would have been $14,116,842 and $0.84, respectively.

      The fair value of options granted during the years ended December 31,
      1996 and 1995 for employee services were estimated on the date of grant
      using the Black-Scholes Pricing Model with the following weighted average
      assumptions:  risk-free interest rate of between 5.82 and 6.65 percent,
      expected life of between 3 and 8 years, expected volatility of 69 percent
      and no dividends.  There were no options granted for other than employee
      services.





                                      F-13
<PAGE>   37

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      A summary of the status of the Company's stock option plans as of
      December 31, 1996 and 1995 and the changes during the years then ended is
      presented below:

<TABLE>
<CAPTION>
                                                                                   WEIGHTED-AVERAGE
                                                                  OPTIONS           EXERCISE PRICE
                                                                  -------           --------------
      <S>                                                       <C>                  <C>
      Outstanding at December 31, 1994 . . . . . . . . .         1,546,800             $ 3.62
      Granted  . . . . . . . . . . . . . . . . . . . . .           717,154               1.51
      Canceled . . . . . . . . . . . . . . . . . . . . .          (208,523)              3.43
      Exercised  . . . . . . . . . . . . . . . . . . . .               ---                ---
                                                                 ---------
      Outstanding at December 31, 1995 . . . . . . . . .         2,055,431               2.90
      Granted  . . . . . . . . . . . . . . . . . . . . .           600,102               4.42
      Canceled . . . . . . . . . . . . . . . . . . . . .          (294,129)              3.52
      Exercised  . . . . . . . . . . . . . . . . . . . .          (192,640)              3.07
                                                                 ---------
      Outstanding at December 31, 1996 . . . . . . . . .         2,168,764             $ 3.22

</TABLE>


<TABLE>
<CAPTION>      
                                                             December 31, 1996    December 31, 1995
                                                             -----------------    -----------------
      <S>                                                    <C>                  <C>
      Weighted-average fair value of options granted
      during the period at an exercise price equal to
      market at issue date . . . . . . . . . . . . . . .         $ 2.72                $ 0.88
</TABLE>

      The following tables summarize information about the Company's stock
      options outstanding as of December 31, 1996 and December 31, 1995,
      respectively:


<TABLE>
<CAPTION>
                                                            Weighted                                       
                                            Weighted        Average                          Weighted      
                           Options          Average         Exercise        Options          Average       
          Option         Outstanding       Remaining        Price of      Exercisable     Exercise Price   
      Exercise Price    as of 12/31/96  Contractual Life   Outstanding  as of 12/31/96    of Exercisable   
      --------------    --------------  ----------------   -----------  --------------  ----------------   
      <S>                 <C>                    <C>           <C>          <C>                <C>                
       $1.31 - $3.50       1,238,673              4.39         $2.18         727,483            $2.56   
                                                                                                           
       $3.56 - $5.36         930,091              6.53         $4.61         241,750             $4.94   
                           ---------                                         -------
       $1.31 - $5.36       2,168,764              5.31         $3.22         969,233             $3.15   
</TABLE>





                                      F-14
<PAGE>   38

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





<TABLE>
<CAPTION>
                                            Weighted         Weighted                          Weighted
                           Options          Average           Average         Options          Average
          Option         Outstanding       Remaining      Exercise Price    Exercisable     Exercise Price
      Exercise Price    as of 12/31/95  Contractual Life  of Outstanding   as of 12/31/95  of Exercisable
      --------------    --------------  ----------------  --------------   --------------  ---------------
       <S>              <C>             <C>               <C>              <C>             <C>
       $1.31 - $3.50         1,463,029          5.10            $2.21             477,225          $3.12
                                                                                              
       $3.59 - $5.36           592,402          3.32            $4.60             208,833          $4.58
                            ----------                                           --------     
                                                                                              
       $1.31 - $5.36         2,055,431          4.59            $2.90             686,058          $3.56
                                                                                              
</TABLE>                                                                      

      The fair value of warrants issued during the years ended December
      31, 1996 and 1995 for other than employee services were estimated on
      the date of grant using the Black-Scholes Pricing Model with the
      following weighted average assumptions:  risk-free interest rate of
      6.06 percent, expected life of 5 years, expected volatility of 69
      percent and no dividends.
      
      The following table summarizes the status of the Company's warrants as of
      December 31, 1996 and 1995, and changes during the periods then ended is
      presented below:

<TABLE>
<CAPTION>
                                                                                      WEIGHTED-AVERAGE
                                                                      WARRANTS         EXERCISE PRICE
                                                                      --------         --------------
           <S>                                                      <C>                  <C>
           Outstanding at December 31, 1994 . . . . . . . . .         4,712,066          $  7.78
           Issued . . . . . . . . . . . . . . . . . . . . . .               ---              ---
           Forfeited  . . . . . . . . . . . . . . . . . . . .               ---              ---
           Canceled . . . . . . . . . . . . . . . . . . . . .          (373,633)            3.50
           Reissued . . . . . . . . . . . . . . . . . . . . .           373,633             3.50
                                                                      ---------
           Outstanding at December 31, 1995 . . . . . . . . .         4,712,066             7.78
           Issued . . . . . . . . . . . . . . . . . . . . . .           844,097             3.89
           Forfeited  . . . . . . . . . . . . . . . . . . . .               ---              ---
           Canceled . . . . . . . . . . . . . . . . . . . . .          (124,732)            3.93
           Exercised  . . . . . . . . . . . . . . . . . . . .           (57,274)            3.50
           Reissued . . . . . . . . . . . . . . . . . . . . .           116,384             3.88
                                                                      ---------
           Outstanding at December 31, 1996 . . . . . . . . .         5,490,541          $  7.23

</TABLE>

<TABLE>
<CAPTION>
                                                                  DECEMBER 31, 1996     DECEMBER 31, 1995
                                                                  -----------------     -----------------                   
           <S>                                                        <C>                     <C>
           Weighted-average fair value of warrants issued during
           the year ended at an exercise price equal to market
           price at issue date  . . . . . . . . . . . . . . .           $0.00                  $0.00

           Weighted-average fair value of warrants issued during
           the year ended at an exercise price less than market
           at issue date  . . . . . . . . . . . . . . . . . .           $2.26                  $0.00

           Weighted-average fair value of warrants issued during
           the year ended at an exercise price greater than
           market at issue date . . . . . . . . . . . . . . .           $2.17                  $0.00
</TABLE>


                                      F-15
<PAGE>   39

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


      The warrants shown above were issued in connection with equity
      transactions of the Company and, therefore, there is no effect on net
      income.

      During December 1996, the Compensation and Personnel Committee of the
      Board of Directors authorized the extension of options originally granted
      for a five year period to ten years upon election by individual option
      holders.  No elections were made in 1996 and when such elections are made
      in 1997, may result in compensation expense being recorded for any
      difference between the original option exercise price and fair market
      value on the effective date of the election.

(4)   INCOME TAXES

      The Company uses the asset and liability method of accounting for income
      taxes.  Under the asset and liability method of Statement 109, deferred
      tax assets and liabilities are recognized for the future tax consequences
      attributable to differences between the financial statement carrying
      amounts of existing assets and liabilities and their respective tax bases
      and operating loss and tax credit carry forwards.  Deferred tax assets
      and liabilities are measured using enacted tax rates expected to apply to
      taxable income in the years in which those temporary differences are
      expected to be recovered or settled. The effect on deferred tax assets
      and liabilities of a change in tax rates is recognized in income in the
      period that includes the enactment date.

      At December 31, 1996 and 1995, the net deferred tax asset totaled
      approximately $22,000,000 and $15,355,000, respectively, and was fully
      reserved.  The Company did not incur any tax expense in any year due to
      operating losses.

      At December 31, 1996, 1995 and 1994, the Company had net operating loss
      carry forwards of approximately $45,496,000, $28,292,000 and $19,411,000,
      respectively, for federal income tax return purposes.  Utilization of the
      Company's net operating loss carry forwards is subject to certain
      limitations due to specific stock ownership changes which have occurred
      or may occur.  To the extent not utilized, the carry forwards will expire
      during the years beginning 2002 through 2011.

(5)   EQUIPMENT AND LEASEHOLD IMPROVEMENTS

      Equipment and leasehold improvements consist of the following:
<TABLE>
<CAPTION>
                                                              December 31,1996     December 31, 1995
                                                              ----------------     -----------------
      <S>                                                       <C>                   <C>
      Laboratory and office equipment                           $ 4,079,728           $ 3,827,643
      Leasehold improvements                                      3,701,772             3,701,772
                                                                -----------           -----------
                                                                  7,781,500             7,529,415
      Less accumulated depreciation and amortization             (4,323,488)           (3,746,586)
                                                                -----------           ----------- 
                                                                $ 3,458,012           $ 3,782,829
                                                                ===========           ===========
</TABLE>                                                   





                                      F-16
<PAGE>   40

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





(6)   COMMON STOCK RESERVED

      The Company has reserved common stock for issuance as of December 31,
      1996 as follows:

<TABLE>
             <S>                                                  <C>         
             Stock option plans                                     3,064,027
             Agreement with Genentech, Inc.                           285,715
             Warrants issuable under the Genentech Agreement          142,858
             Warrants outstanding                                   5,490,541
             Underwriters purchase options and related warrants       710,000
             IPI acquisition (contingent shares)                    1,000,000 (See note 14)
                                                                   ----------                
                  Total shares reserved                            10,693,141
                                                                   ==========
</TABLE>

      LG Chem has the option to purchase up to $5 million of common stock on
      one of four exercise dates ending at December 31, 1997.  The minimum
      purchase amount is $1,000,000 and LG Chem and TBC must agree on the
      purchase price or the option cannot be exercised on the given exercise
      date.  As of March 4, 1997, the Board of Directors approved an additional
      1.1 million in Common Stock issuable pursuant to the stock option plans,
      subject to the approval of stockholders at the annual meeting on May 6,
      1997, which would be in addition to the reserved shares shown.  See (note
      16)

(7)   CLINICAL RESEARCH AGREEMENTS

      On February 10, 1995, the Company entered into an agreement with Coromed,
      Inc., a contract research organization, to coordinate the clinical
      evaluation of NOVASTAN(R) as an adjunct to streptokinase in acute
      myocardial infarction.  Coromed is responsible for managing all aspects
      of the clinical trial and making all financial remuneration to testing
      sites.  The term of the agreement is 19 months, subject to extension upon
      the mutual written agreement of both parties.  The parties have agreed to
      a total budget of approximately $3,196,000.  Of this amount, $106,000 was
      paid upon execution of a letter of intent and approximately $450,000 was
      paid upon execution of the agreement.  Subsequent payments will be made
      monthly on a per patient basis, to a maximum total of approximately
      $2,490,000.  Three additional payments of $50,000 each will be made upon
      completion of specified tasks by Coromed.  If the clinical trial is
      completed in less than 19 months, the Company will pay Coromed a bonus
      calculated as a percentage of personnel costs as set forth in the budget,
      to a maximum bonus amount of approximately $327,000.  In addition, the
      Company has engaged Coromed to provide various services related to other
      ongoing NOVASTAN(R) trials being conducted by the Company.

      On May 1, 1996, the Company amended the above agreement with Coromed,
      Inc.  The term of the contract was extended to 24 months with an
      additional cost of $1,200,000.  The bonus payment, if any, is now based
      on the completion in less than 24 months.

      On April 1, 1995 the Company entered into an agreement with Coromed, Inc.
      for data management services for the clinical trial related to use of
      NOVASTAN(R) in patients with Heparin-Induced Thrombocytopenia ("HIT").
      The term of the agreement is 17 months, subject to extension upon the
      mutual written agreement of both parties.  The parties have agreed to a
      total budget of  $245,295.  Of this amount, $24,530 was paid upon
      execution of the contract.  Subsequent payments will be paid upon
      completion of certain tasks.  In addition, the Company has engaged
      Coromed to provide various services related to other ongoing NOVASTAN(R)
      trials being conducted by the Company.

      On June 1, 1995, the Company entered into an agreement with Coromed,
      Inc., to coordinate the clinical evaluation of  NOVASTAN(R) as an adjunct
      to t-PA in acute myocardial infarction.  Coromed is responsible for
      managing all aspects





                                      F-17
<PAGE>   41

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      of the clinical trial and making all financial remuneration to testing
      sites.  The term of the agreement is 16 months, subject to extension upon
      the mutual written agreement of both parties.  The term of the contract
      expired on October 1, 1996, however, the trials are still ongoing and the
      terms of the contract remain in effect.  The parties have agreed to a
      total budget of  $961,659.  Of this amount, $44,000 was paid upon
      execution of a letter of intent and $138,566 was paid upon execution of
      the agreement.  Subsequent payments will be made monthly on a per patient
      basis, to a maximum total of approximately $734,000.  Three additional
      payments of $15,000 each will be made upon completion of specified tasks
      by Coromed.  If the clinical trial is completed in less than 13 months,
      the Company will pay Coromed a bonus calculated as a percentage of
      personnel costs as set forth in the budget, to a maximum bonus amount of
      approximately $45,000.

      On July 1, 1995 the Company entered into an agreement with Coromed, Inc.
      for program management services and clinical monitoring services for a
      clinical trial comparing the efficacy and safety of NOVASTAN(R) versus
      Arvin(R) in patients with Heparin-Induced Thrombocytopenia ("HIT") or
      Heparin-Induced Thrombocytopenia and Thrombosis Syndrome ("HITTS").  The
      original term of the agreement was 15 months, and was extended until
      March 31, 1997.  The parties have agreed to a total budget of $409,270
      including the extension.  Of this amount, $30,000 was paid upon execution
      of a letter of intent.  Subsequent payments will be paid upon completion
      of certain tasks.

 (8)  RESEARCH AGREEMENTS

      During September 1993, IPI entered into an agreement to provide research
      and development services, over a period of 30 months, to EISAI Co., LTD
      ("EISAI").  The agreement guaranteed $3,900,000 in contract research
      funding and allowed for additional amounts to be received upon the
      attainment of certain milestones. In addition, the contract provided for
      an extension for up to two additional years at the sole discretion of
      EISAI, if TBC received written notification from EISAI in September 1995.
      EISAI did not send written notification extending the contract.  The
      agreement provides for payment of royalties under certain conditions.  As
      of December 31, 1995, the total $3,900,000 in contract payments had been
      received, of which approximately $400,000 was included in current
      deferred revenue at December 31, 1995.  On August 10, 1995, IPI received
      a $2,000,000 milestone payment from EISAI, which was recognized as income
      in the third quarter.  In conjunction with the agreement, IPI remunerated
      a former director of the Company as a third party consultant under an
      agreement which provides for compensation based upon cash received from
      EISAI pursuant to the EISAI agreement.  The agreement expired in March
      1996.

      On October 11, 1994, the Company signed a collaborative agreement with
      Synthelabo, a French pharmaceutical group, to develop and market
      compounds for vascular proliferative disease derived from the Company's
      research programs.  Upon consummation of the transaction, Synthelabo
      purchased 1,428,571 shares of Common Stock for $3.50 per share for a
      total of $5 million becoming the Company's largest shareholder at that
      time and paid the Company a non-refundable licensing fee of $3 million.
      In addition, Synthelabo committed to pay $3 million annually in research
      payments (payable in quarterly installments of $750,000). Beginning
      October 31, 1996, the parties to the agreement have agreed to revise the
      payment for the third year to be $750,000 which has already been paid.
      No such payments will be made in 1997.  Synthelabo has agreed, upon the
      achievement of certain milestones, to make further payments of up to $3
      million per year for up to $18 million in total.  Synthelabo has the
      right to terminate the agreement any time on or after October 15, 1997
      for any reason and either party has the right to terminate the contract
      for breach of any material obligation.  If Synthelabo exercises this
      termination right, the license granted to Synthelabo will  terminate and
      TBC will pay Synthelabo a royalty on net sales of any products sold in a
      certain territory (Europe, Middle East, Africa and countries of the
      former Soviet Union) for a period of time.  In addition, Synthelabo may,
      at its option, require that the technology be transferred to and the
      development program be conducted by a joint venture owned by TBC and
      Synthelabo should "net worth", as defined in the agreement, be less than
      $5 million as of the end of any calendar quarter during the term of the
      agreement.  For the years ended





                                      F-18
<PAGE>   42

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      December 31, 1995 and December 31, 1996, TBC received $3 million related
      to the Synthelabo agreement.  Synthelabo will pay royalties to TBC based
      on the net sales in those areas covered in the agreement.  In exchange
      for the above consideration, Synthelabo will receive an exclusive license
      to manufacture, use, and sell any products generated from the research,
      in Europe, the Middle East, Africa and the countries of the former Soviet
      Union.  The first quarterly research payment of $750,000 was received on
      October 31, 1994, of which $500,000 was recognized in 1994.  During the
      year ended December 31, 1996, research payments of $3,000,000 were
      received of which $2,625,000 was recognized as income during the year.
      Synthelabo amended the contract effective on November 1, 1996 noting that
      the November 1996 research payment of $750,000 would be for research
      conducted during the period of November 1, 1996 through October 31, 1997.
      As of December 31, 1996, $625,000 is included in current deferred
      revenue.  Synthelabo will pay royalties to TBC, based on the net sales,
      in those geographic areas covered in the agreement.

      During 1995, the Company and Synthelabo mutually agreed to exchange
      certain clinical data.  During 1996, the Company signed two agreements
      with Synthelabo with respect to the supply of information related to
      certain clinical studies. Over the term of the agreements as certain
      milestones are met, Synthelabo has committed to pay TBC up to
      $2,920,000.  These payments are dependent on rate of enrollment in
      certain clinical studies, the completion of certain clinical studies and
      date of completion of certain clinical studies.  As of December 31, 1996,
      TBC has recognized approximately $2.3 million of revenue related to these
      agreements.  Synthelabo is the licensee for NOVASTAN(R) in certain
      territories other than those which were sublicensed to TBC.

      On October 10, 1996, the Company signed a strategic alliance agreement
      with LG Chem, a Korean corporation, to develop and market compounds
      derived from the Company's Endothelin Receptor and Selectin Antagonist
      for certain disease indications.  Upon consummation of the transaction,
      LG Chem purchased 1,250,000 shares of common stock for $4.00 per share
      for a total of $5 million.  In addition, LG Chem has committed to pay
      $10.7 million in research payments.  Of this amount, $100,000 will be
      paid on or before December 31, 1996, $1.0 million will be paid on each
      of June 30 and December 31 of 1997, 1998, 1999 and 2000, and $1.3
      million on June 30 and December 31, 2001.  LG Chem has the right to
      terminate future research payments if TBC fails to meet certain
      Agreement milestones, which milestones will be established by the
      parties in accordance with the agreement.  LG Chem will pay royalties to
      TBC, based on net sales, in those geographic areas covered by the
      agreement, which include Korea, China, India and certain other Asian
      countries, excluding Japan.  The Company will pay its agents in the
      contract negotiations, a commission on all future research payments as
      well as a royalty on net sales.
      
(9)   LICENSE AGREEMENT

      In May 1993, TBC entered into an agreement with Genentech to sublicense
      Genentech's rights and technology relating to NOVASTAN(R) (argatroban)
      originally licensed to Genentech by Mitsubishi Chemical Corporation
      ("Mitsubishi"), and to license Genentech's own proprietary technology
      developed with respect to NOVASTAN(R) (the "Genentech Agreement").  Under
      the license and sublicense, the Company has an exclusive license to use
      and sell NOVASTAN(R) in the United States and Canada for specified human
      cardiovascular indications, not including cerebral thromboembolism
      (stroke).  The Company is required to pay Genentech and Mitsubishi
      specified royalties on net sales of NOVASTAN(R) by the Company and its
      sublicensees after its commercial introduction in the United States and
      Canada.  Genentech has the right to terminate the agreement or to cause
      the license to become non-exclusive if the Company fails to exercise due
      diligence in performing its obligations under the agreement for a period
      of 60 days after receiving written notice from Genentech or fails to
      maintain a minimum consolidated tangible net worth of $5.0 million. The
      Genentech Agreement, as amended, provides that Mitsubishi may terminate
      Genentech's license with Mitsubishi (which results in the termination of
      the Genentech Agreement as well) if TBC does not file an NDA for
      NOVASTAN(R) with the FDA no later than June 30, 1997, subject to certain
      additional goals





                                      F-19
<PAGE>   43
               TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                      (A DEVELOPMENT STAGE ENTERPRISE)

                 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


being met by TBC.  As of December 31, 1995, TBC had not met certain of those
goals.  However, Mitsubishi has agreed to withhold its rights to terminate the
license with Genentech if the NDA is filed by June 30, 1997, and if TBC
accomplishes the following milestones:  (i) on or before December 31, 1996, TBC
shall have met certain enrollment guidelines for certain NOVASTAN(R) clinical
trials; (ii) on or before March 31, 1997, TBC shall complete, report and
analyze certain other NOVASTAN(R) clinical trials; (iii) on or before September
30, 1997, TBC shall have agreed to proceed with the Phase III trial in AMI, and
(iv) TBC shall comply with certain reporting and information meeting
requirements.  If these milestones are not met, Mitsubishi will retain the
rights to terminate the Genentech license; provided, that if such termination
results from TBC's violation of the milestone described in (iii) above, TBC
will receive a license from Mitsubishi in the field of HIT/HITTS on the same
terms, as presently included in the Genentech Agreement.  As of December 31,
1996, TBC had not met certain of these goals and to date, Mitsubishi has not
asserted its rights to terminate the license arising out of this default. 
Either party may terminate the Genentech Agreement on 60 days notice if the
other party defaults in its material obligations under the agreement, declares
bankruptcy or is insolvent, or if a substantial portion of its property is
subject to attachment.  The Genentech Agreement is also subject to the
continuation of Genentech's license agreement with Mitsubishi, which is only
terminable if Genentech defaults in its material obligations under the
agreement, declares bankruptcy or is insolvent, or if a substantial portion of
its property is subject to attachment.  Unless terminated sooner pursuant to
the above described termination provisions, the Genentech Agreement is expected
to expire in June 2007.  Under the Genentech Agreement, TBC has access to an
improved formulation patent granted in 1993 which expires in 2010 and a use
patent which expires in 2009.
        
Mitsubishi further agreed to supply the Company with its requirements of
NOVASTAN(R) throughout the term of the Genentech Agreement for TBC's clinical
testing and commercial sales of NOVASTAN(R) in the United States and Canada. 
In the event Mitsubishi should discontinue the manufacture of NOVASTAN(R),
Mitsubishi, Genentech and TBC have agreed to discuss in good faith the means by
which, and the party to whom, NOVASTAN(R) production technology will be
transferred.  The transferee may be a person or entity other than Genentech or
TBC.  At present, Mitsubishi is the only manufacturer of NOVASTAN(R).  Should
Mitsubishi terminate or default in its supply commitment, there can be no
assurance that alternate sources of bulk NOVASTAN(R) will be available to the
Company at reasonable cost, if at all.  If such alternate sources of supply are
unavailable or uneconomic, the Company's results of operations would be
materially and adversely affected.
        
In exchange for the license to Genentech's NOVASTAN(R) technology, TBC issued
Genentech 285,714 shares of Common Stock and agreed to issue (i) an additional
214,286 shares of Common Stock to Genentech within 10 days after the filing of
the first New Drug Application ("NDA") with the FDA for NOVASTAN(R), and (ii)
an additional 71,429 shares of Common Stock to Genentech within 10 days after
the FDA's first approval of an NDA for NOVASTAN(R).  The Company has also
agreed to grant Genentech a warrant to purchase an additional 142,858 shares of
Common Stock at an exercise price of $14.00 per share, subject to adjustment,
within ten days of the filing of the first NDA  for NOVASTAN(R) with the FDA. 
If the Company is unable to issue any of the additional shares of Common Stock
or the warrant to Genentech due to circumstances beyond the Company's control,
the Company has agreed to pay Genentech, in lieu thereof, an amount equal to
the value of the securities plus interest from May 27, 1993 at the prime rate
plus one percent, compounded annually.  The value of the Common Stock is deemed
to be $7.00 per share, which represents the cash consideration the Company will
be obligated to pay to Genentech as liquidated damages, and the value of the
warrants is to be determined by appraisal, based on the warrants' market value. 
The Company will not be required to make any cash payment if both of the filing
and approval of the NDA do not occur.  TBC has also granted Genentech demand
and piggyback registration rights with regard to shares of Common Stock issued
to Genentech.
        




                                      F-20
<PAGE>   44

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      In connection with the Genentech Agreement, a consultant involved in
      negotiations related to the Agreement will receive a royalty on net sales
      of licensed products.
        
(10)  401(k) PLAN

      The Company adopted a 401(k) plan which became effective on September 1,
      1993.  Under the plan, all employees with three months of service are
      eligible to participate in the plan and may contribute up to 15 percent of
      their compensation, with a maximum of $9,500 per employee in 1996. At the
      present time, no matching contributions have been authorized by the Board
      of Directors.  Costs associated with administering the plan totaled
      approximately $10,000 in 1996.  During 1995, the existing 401(k) plan of
      ImmunoPharmaceutics, Inc. was merged into the Texas Biotechnology
      Corporation plan.
        
(11)  CONSOLIDATION OF IMMUNOPHARMACEUTICS, INC.

      The Company decided to consolidate the IPI operation into TBC's in the
      first half of 1996. The Company believes the goodwill associated with IPI,
      $643,750, was impaired due to the decision to cease operations at IPI and
      the sale of the QED business unit and has charged it to expense in the
      year ended December 31, 1995.  The restructuring costs associated with the
      consolidation of the IPI operation were approximately $421,000 and have
      been expensed in the three months ended March 31, 1996.  This cost
      included waste disposal, future lease commitments, severance pay  and
      related taxes.

(12)  COMMITMENTS AND CONTINGENCIES

      a)     Employment Agreements

             Since inception, the Company has entered into employment
             agreements with certain officers and key employees.  The Company
             has signed agreements with five of its officers to provide certain
             benefits in the event of a "change of control" as defined in these
             agreements and the occurrence of certain other events.  The
             agreements provide for a lump-sum payment in cash equal to
             eighteen (18) months to three (3) years of annual base salary and
             annual bonus if any.  The base salary portion of the agreements
             would aggregate approximately $1.6 million at current rate of
             compensation.  In addition,  the agreements provide for gross-up
             for certain taxes on the lump-sum payment, continuation of certain
             insurance and other benefits for periods of eighteen (18) months
             to three (3) years and reimbursement of certain legal expenses in
             conjunction with the agreements.  These provisions are intended to
             replace compensation continuation provisions of any other
             agreement in effect for an officer if the specified event occurs.

      (b)    Lease Agreements

             The Company has renegotiated its noncancelable lease agreement
             which began December 1, 1990 for its facilities in Houston, Texas
             and executed a new lease agreement.  The new lease is effective
             January 1, 1995 and calls for a lease term of six years at an
             annual rate of $706,663 for 1995 and $712,449 for 1996 through
             December 2000 subject to adjustments based on certain variable
             building operating expenses.  The Company also amended the lease
             effective for the period from October 1, 1996 through June 30,
             1997 to include additional expansion space for research and
             development.  For the years ended December 31, 1996, 1995, 1994,
             and the period from August 2, 1989 (date of incorporation) to
             December 31, 1996, rent and related building services totaled
             approximately $1,025,000, $1,218,000, $1,416,000 and $6,969,000,
             respectively, of which approximately $924,000, $1,076,000,
             $1,225,000 and $5,242,000, respectively, was charged to research
             and development expense.





                                      F-21
<PAGE>   45

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





             Total committed lease payments from January 1, 1997 through
             December 31, 2000 equal $2,849,796.  The Company has also
             committed to pay for seventy-four parking spaces during the lease
             at the facility established rate charged which currently
             approximates $45,000 per annum.  The lease also includes a
             provision for the Company to pay certain additional charges to
             obtain utilities and building services during off-business hours.
             Currently, the amount of these charges is approximately $250,000
             per annum, payable in monthly installments.  These charges are
             subject to annual adjustments based on the local consumer price
             index.  Should the Company terminate the use of non-standard
             services, an additional amount of up to $4,167 per month shall be
             due in addition to base rent on the remaining lease payments
             through December 2000.  In addition, the lease grants certain
             credits to rent and utilities which at December 31, 1996 totaled
             approximately $225,000, and which will be amortized on a straight
             line basis over the lease term.

             The Company leases certain scientific equipment and computer
             hardware and software.  These have been classified as operating
             leases.  The future minimum lease payments for noncancelable
             equipment leases are $45,310 and $3,776 for the years ended
             December 31, 1997 and 1998. For the year ended December 31, 1996
             and the period August 1, 1994 through December 31, 1996, lease
             expenses totaled $114,321 and $314,246, respectively.

      c)     Legal Proceedings

             On November 21, 1994, a class action shareholders' suit was filed
             in the United States District Court for the Southern District of
             Texas, Houston Division seeking damages in the amount of $16
             million.  Plaintiffs are two individuals who purchased shares of
             the Company on December 16, 1993 following the Company's initial
             public offering.  In their complaint, plaintiffs have sued the
             Company, and certain members of the board of directors and certain
             officers alleging violations of Sections 11, 12 and 15 of the
             Securities Act of 1933, as amended (the "Act").  Plaintiffs have
             also named David Blech, D. Blech & Co., Incorporated and Isaac
             Blech as defendants. On January 23, 1995, the Company and the
             members of the board of directors filed a motion to dismiss the
             plaintiffs' complaint pursuant to Rule 9(b) and Rule 12b(6) of the
             Federal Rules of Civil Procedure.  In addition, defendant John
             Pietruski, Chairman of the Board of Directors, filed a motion to
             dismiss the plaintiffs' complaint pursuant to Rule 12(b)(2) of the
             Federal Rules of Civil Procedure.  On February 7, 1995, the
             plaintiffs filed a motion for class certification.  The Court
             denied the motion by the Company and by John Pietruski.

             On March 28, 1995, a second class action shareholders' suit was
             filed in the United States District Court for the Southern
             District of New York seeking unspecified damages.  Plaintiffs are
             eight individuals who purchased shares in various companies for
             which D. Blech & Co. acted as an underwriter (or co-underwriter)
             or marketmaker. In their complaint, the plaintiffs have sued the
             Company alleging violations of Section 10(b) of the Securities
             Exchange Act of 1934, as Amended (the "Exchange Act") and Rule
             10b-5 promulgated thereunder by the Securities and Exchange
             Commission (the "Commission").  Plaintiffs have named a number of
             defendants, including David Blech and D. Blech & Co., four
             individuals, two brokerage firms, one investment management
             company and ten other companies for which D. Blech & Co. acted as
             underwriter or marketmaker.

             On August 14, 1995, the Judicial Panel on The Multi-District
             Litigation ordered that the action filed in the United States
             District Court for the Southern District of Texas, Houston
             Division be transferred to the United States District Court for
             the Southern District of New York for coordinated or consolidated
             pretrial proceedings with the action pending there.   In light of
             the transfer and consolidation of the Texas case with similar
             cases against other companies for which Blech acted as
             underwriter, the Company requested that the Court in New York
             reconsider the Texas Court's denial of its motion to dismiss as a
             part of the Court's





                                      F-22
<PAGE>   46

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





             consideration of similar motions to dismiss filed by those
             companies.  All of these motions were presented to the Court on
             February 6, 1996.  On June 6, 1996, the New York District Court
             entered two memorandum opinions in the consolidated cases.  In one
             of its opinions, the Court dismissed all of the Exchange Act and
             common law fraud claims filed against the Company and its officers
             and directors, but afforded those plaintiffs the right to attempt
             to preserve those claims by repleading them.  The Court ordered
             that those claims be repleaded no later than July 26, 1996.
             Plaintiffs did not replead those claims by the deadline, resulting
             in the dismissal of all claims against the Company in that
             litigation.  In its opinion in the second case, i.e., the case
             filed on November 21, 1994, the Court granted the Company and its
             officers and directors' motion for reconsideration, but together
             with all other similar pending motions, denied the requested
             relief.  Pursuant to the court's order, the Company therefore
             filed an answer in that case. The Company also filed a Motion
             seeking leave of court to prosecute an immediate appeal of the
             Court's denial of the Company's Motion to Dismiss.  The Court
             heard argument on that Motion on October 10, 1996.  The motion was
             denied on January 16, 1997.  Given the early stage of that case,
             which is the only remaining shareholder litigation against the
             Company, the Company is unable to evaluate its potential outcome
             at this time. The Company disputes these claims and intends to
             contest them vigorously.

(13)  SHORT TERM NOTE RECEIVABLE

      On April 12, 1994, the Company loaned $350,000 to D. Blech and Company,
      Incorporated in exchange for a non-interest bearing promissory note of
      even amount.  The loan represents advance payment of a success fee
      pursuant to a consulting agreement with D. Blech and Company,
      Incorporated payable in connection with the IPI acquisition (note 14).
      As of December 31, 1996, $227,500 of the fee had been earned.  The
      remaining amount of the note will be considered earned as fees upon
      issuance of the remaining Company stock related to the IPI acquisition
      upon the satisfaction of the conditions to issuance.  Any amount not
      earned will be due and payable on the day following the date the
      conditions cannot be met or June 18, 1997.

(14)  ACQUISITION OF IMMUNOPHARMACEUTICS, INC.

      On July 25, 1994, the Company acquired all of the outstanding common
      stock of IPI in exchange for common stock of the Company.  TBC issued (i)
      1,599,958 shares of common stock which was distributed to the existing
      IPI shareholders, (ii) 999,956 shares of common stock, issued in the
      names of IPI shareholders that was held in escrow pending satisfaction of
      certain research and development milestones and released from escrow on
      June 30, 1995, and (iii) contingent stock issue rights to issue an
      aggregate of 1,400,000 shares of common stock, the conversion of which is
      pending satisfaction of research and development milestones, in exchange
      for all the issued and outstanding shares of IPI (after conversion of the
      IPI Series A and Series B preferred stock and all options and warrants).
      On June 30, 1995, the Company issued 399,961 shares pursuant to the
      contingent stock issue rights, upon attainment of certain research and
      development milestones.

      The acquisition of IPI was accounted for under the purchase method of
      accounting.  The aggregate purchase price (consisting of the fair value
      of non-contingent TBC shares issued, transaction expenses and liabilities
      assumed) was allocated to the tangible and intangible assets acquired
      based on their estimated fair value as of the date of the acquisition.
      The common stock issued on July 25, 1994 was valued at $3.63 per share
      which was derived by discounting the value of the TBC shares without the
      attached warrant on July 25, 1994. The common stock issued on June 30,
      1995 and the common stock released from escrow was valued at $1.41 per
      share which was derived by discounting the value of the TBC shares on
      June 30, 1995.  During the second quarter of 1995, the Company charged
      $1,973,883 to in-process research and development expense which
      represented the value of the 1,399,917 shares of TBC common stock
      (including 999,956 shares released from escrow and 399,961 shares issued
      pursuant to the





                                      F-23
<PAGE>   47

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      contingent stock issue rights) given as consideration for acquired
      technology.  The value of the remaining shares issuable upon conversion
      of the contingent stock issue rights will be determined when the research
      and development milestones are met by IPI, if ever, and additional
      in-process research and development expense will be recorded at such
      time.  As of December 31, 1996, the Company had determined that the
      contractual requirements for issuance of additional shares pursuant to
      the contingent stock issue rights had not been met.  The Company has
      received notification from the committee representing former IPI
      shareholders that it does not agree with this determination.   Any
      further discussion would be by arbitration pursuant to the Acquisition
      Agreement.

      The following is an allocation of the purchase price to the tangible and
      intangible assets acquired based on their estimated fair value as of the
      date of the IPI acquisition:

<TABLE>
             <S>                                                             <C>
             Common stock issued to IPI shareholders on July 25, 1994        $  5,807,848
             Common stock released from escrow on June 30, 1995                 1,409,938
             Common stock issued pursuant to contingent stock issue
                  rights on June 30, 1995                                         563,945
             Costs and expenses of acquisition                                    461,368
             Liabilities assumed                                                1,738,238
                                                                             ------------
                 Total purchase price                                        $  9,981,337
                                                                             ============

             Current assets                                                  $    457,263
             Equipment, furniture and fixtures and leasehold improvements         308,464
             Intangible assets                                                    750,000
             In-process research and development                                8,465,610
                                                                             ------------
                                                                             $  9,981,337
                                                                             ============
</TABLE>

      The Company consolidated the IPI operation into TBC's in the first half
      of 1996. The overall financial impact on the Company's performance was
      positive in 1996 due to the reduction in general and administrative
      expenses and the elimination of some research and development positions
      associated with IPI.  The Company believes the goodwill associated with
      IPI, $643,750, is impaired due to the decision to cease operations at IPI
      and the sale of the QED business unit and has charged it to expense in
      the year ended December 31, 1995.  The restructuring costs associated
      with the consolidation of the IPI operation were approximately $421,000
      and have been expensed in 1996.  The costs included waste disposal,
      future lease commitments, severance pay and related taxes.

(15)  ASSET SALE

      On October 2, 1995, IPI sold the assets of a division, QED, which
      manufactures and sells monoclonal antibodies.  The buyer was QED
      Bioscience, Inc., a California corporation ("QEDB"), owned by Dr. Edward
      T. Maggio, two former IPI employees and two other individuals.  Dr.
      Maggio is also an officer of QEDB.  The sale agreement restricts the
      activities that Dr. Maggio can perform as an officer and shareholder of
      QEDB as long as he is an employee of the Company.  The Company received
      $150,000 in cash, payment for certain prepaid items and inventory and
      royalties of $30,000, in total, to be paid at the rate of $10,000 per
      year. Five IPI employees that were assigned to QED resigned and are now
      employed by QEDB.  The divestiture of the QED assets will have no
      material future impact on the operations of the Company.

      During the fourth quarter of 1996, the Company concluded an agreement
      with Structural BioInformatics, Inc.  ("SBI"), wherein the Company
      received 468,334 shares of common stock of SBI in exchange for certain
      assets and use of a portion of facilities and equipment.  The common
      stock was valued at $59,591 which is comprised of





                                      F-24
<PAGE>   48

                 TEXAS BIOTECHNOLOGY CORPORATION AND SUBSIDIARY
                        (A DEVELOPMENT STAGE ENTERPRISE)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





      $25,997 in net book value of assets given up and $33,594 representing the
      value of facilities and equipment use provided.  Pursuant to the
      agreement, the Company has the right to certain databases developed by
      SBI.  Dr. Maggio is an officer of SBI.

(16)  SUBSEQUENT EVENTS (UNAUDITED)

      As of March 4, 1997, the Board of Directors approved increases in the
      number of shares authorized of 1,000,000 shares in the 1995 Plan and
      100,000 shares in the 1995 Director Plan respectively, subject to the
      approval of stockholders at the annual meeting on May 6, 1997.





                                      F-25
<PAGE>   49
                               INDEX TO EXHIBITS
<TABLE>
<CAPTION>

  Exhibit No                            Description of Exhibit
  ----------                            ----------------------
  <S>            <C>
   2.1   (8)*    Plan and Agreement of Merger, dated June 17, 1994, among the 
                 Company, TBC Acquisition Company No. 1 and certain major
                 shareholders of ImmunoPharmaceutics, Inc.

   2.2   (9)     Common Stock Purchase Agreement between the Company and 
                 Sylamerica, Inc., a Subsidiary of Synthelabo S.A. dated
                 October 11, 1994 (the "Purchase Agreement") and Disclosure
                 Schedule

   3.1   (1)     Certificate of Incorporation, as amended

   3.2   (1)     By-laws, as amended

   3.3   (1)     Amendment to Article IV of By-laws

   3.4   (10)    Amendment to the Certificate of Incorporation dated 
                 November 30, 1993

   3.5   (10)    Amendment to the Certificate of Incorporation dated 
                 May 20, 1994

   3.6   (18)    Certificate of Amendment of Certificate of Incorporation

   3.7   (19)    Amended and Restated By-laws of Texas Biotechnology Corporation

   4.1   (1)     Article II of the By-laws

   4.4   (1)     Agreement with Dr. James T. Willerson dated March 6, 1990

   4.5   (1)     Agreement with Dr. Richard Dixon dated February 23, 1990

   4.6   (7)     Form of Warrant Agreement (with Form of Warrant)

   4.7   (7)     Form of Underwriter's Unit Purchase Options

  10.3   (1)     Employment Agreement with Dr. Richard A. F. Dixon dated 
                 July 15, 1990

  10.4   (1)     Consulting Agreement with Dr. James T. Willerson dated 
                 January 1, 1990

  10.6   (1)     Consulting Agreement with Mr. John M. Pietruski dated 
                 January 1, 1992

  10.11  (2)     Employment Agreement with David B. McWilliams dated 
                 July 15, 1992

  10.12  (3)     Consulting Agreement with Hennessey & Associates, Ltd.

  10.17  (4)(5)* Sublicense and License Agreement dated May 27, 1993 between 
                 Company and Genentech, Inc., together with exhibits

  10.18  (4)*    Stock Agreement dated May 27, 1993 between the Company and 
                 Genentech, Inc.

  10.19  (4)     Technology License Agreement dated June 1, 1993 between the 
                 Company and University of Houston- University Park

  10.25  (6)     Consulting Agreement dated August 1, 1993, between the 
                 Company and D. Blech & Company, Incorporated

  10.27  (9)*    License and Research and Development Agreement between the 
                 Company and Synthelabo S.A. dated October 11, 1994 (the 
                 "License Agreement"), Schedule 1 - Patent Applications, 
                 Schedule 1.27 - Territories, and Schedule 3.2(c) - Work Plan 
                 for the Company's Restenosis Program
  
                 -   Schedule 1 - Patent Applications.
 
                 -   Schedule 1.27 - Territories.
 
                 -   Schedule 3.2(c) - Work Plan for the Company's Restenosis 
                     Program.

  10.28  (11)*   Agreement between ImmunoPharmaceutics, Inc. And EISAI Co., LTD

                 -   Exhibit A-1 - Work plan timelines.
 
                 -   Exhibit A-2 - Project research proposal.

                 -   Exhibit B - Proposed EISAI Additional Research Payment.

                 -   Exhibit C - Royalty terms.

                 -   Exhibit D - Principal License Terms.

                 -   Exhibit E - List of the Countries in Asia.

                 -   Exhibit F - Personnel Allocation
</TABLE>
<PAGE>   50
<TABLE>
<S>              <C>
  10.31  (12)    Lease Agreement dated, February 24, 1995 between Texas 
                 Biotechnology Corporation and Doctors Center, Inc.

  10.33  (12)    Amended and Restated 1990 Incentive Stock Option Plan

  10.34  (12)    Amended and Restated 1992 Incentive Stock Option Plan (as of 
                 March 3, 1995)

  10.36  (12)    Employment Agreement, dated February 7, 1995 between Richard 
                 P. Schwarz Jr., Ph.D. and Texas Biotechnology Corporation

  10.38  (13)    Clinical Trial Research Agreement dated February 10, 1995
                 between Texas Biotechnology Corporation and Coromed, Inc.

  10.39  (14)    Amended and Restated Stock Option Plan for Non-Employee 
                 Directors
                                       
  10.40  (14)    1995 Stock Option Plan

  10.42  (16)    Clinical Trial Research Agreement dated April 1, 1995 between
                 Texas Biotechnology Corporation and Coromed, Inc.

  10.43  (16)    Clinical Trial Research Agreement dated June 1, 1995 between
                 Texas Biotechnology Corporation and Coromed, Inc.

  10.44  (16)    Clinical Trial Research Agreement dated July 1, 1995 between
                 Texas Biotechnology Corporation and Coromed, Inc.

  10.45  (15)*   Extension Agreement between the Company, Genentech, Inc.
                 and Mitsubishi Chemical Corporation dated as of June 30, 1995
                 (the "Extension Agreement").

  10.46  (16)    Employee Agreement with Stephen L. Mueller and Texas
                 Biotechnology Corporation dated July 1, 1995.

  10.47  (16)    Employee Agreement with David B. McWilliams and Texas 
                 Biotechnology Corporation dated July 1, 1995.

  10.48  (16)    Employee Agreement with Richard A. F. Dixon, Ph.D. and Texas 
                 Biotechnology Corporation dated July 1, 1995.

  10.49  (16)    Employee Agreement with Richard P. Schwarz, Jr., Ph. D. and
                 Texas Biotechnology Corporation dated July 1, 1995.

  10.50  (16)    Employee Agreement with Joseph M. Welch and Texas 
                 Biotechnology Corporation dated July 1, 1995.

  10.51  (17)*   Letter Agreement regarding Argatroban Studies Information
                 dated December 14, 1995, between the Company and Synthelabo
                 Recherche

  10.52  (17)    Amendment B to Clinical Trial Research Agreement dated 
                 February 10, 1995 between Texas Biotechnology Corporation 
                 and Coromed Inc.

  10.53  (18)    Letter of Understanding between Texas Biotechnology 
                 Corporation and Mitsubishi Chemical Corporation dated 
                 July 10, 1996

  10.54  (18)    Form of Indemnification Agreement between Texas Biotechnology
                 Corporation and its officers and directors dated May 3, 1996
</TABLE>
<PAGE>   51
<TABLE>
  <S>            <C>
  10.55  (18)    Amended and Restated 1995 Non-Employee Director Stock Option 
                 Plan (as amended by the Board of Directors on June 30, 1996)

  10.56  (19)*   Strategic Alliance Agreement between Texas Biotechnology 
                 Corporation and LG Chemical, Ltd. dated October 10, 1996

  10.57  (19)    Common Stock Purchase Agreement between Texas Biotechnology 
                 Corporation and LG Chemical, Ltd. dated October 10, 1996

  10.58          Third Amendment dated January 1, 1997 to Consulting Agreement
                 with John M. Pietruski dated January 1, 1992.

  10.59          Amendment to License and Research and Development Agreement 
                 between the Company and Synthelabo S.A.

  23.1           Independent Auditors' Consent

  27.1           Financial Data Schedule
</TABLE>

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

*     The Company has omitted certain portions of these agreements in reliance 
      on Rule 24b-2 under the Securities and Exchange Act of 1934, as amended.

(1)   Filed as an exhibit to the Company's Form 10 (File No. 0-20117) effective 
      June 26, 1992 (as amended) and incorporated herein by reference.

(2)   Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for the 
      quarter ended June 30, 1992 and incorporated herein by reference.

(3)   Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for the
      quarter ended September 30, 1992 and incorporated herein by reference.

(4)   Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for the
      quarter ended June 30, 1993 and incorporated herein by reference.

(5)   Filed as an exhibit to the Company's Form 10-Q/A-1 (File No. 0-20117) for
      the quarter ended June 30, 1993 and incorporated herein by reference.

(6)   Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for the
      quarter ended September 30, 1993 and incorporated herein by reference.

(7)   Filed as an exhibit to the Company's Form S-1 registration statement
      (File No. 0-20117) effective December 15, 1993 (as amended) and
      incorporated herein by reference.

(8)   Filed as an exhibit to the Company's Form 8-K (File No. 0-20117) filed 
      with the Securities and Exchange Commission (the "Commission") on October
      5, 1994 (as amended) and incorporated herein by reference.

(9)   Filed as an exhibit to the Company's Form 8-K/A (File No. 0-20117) filed
      with the Commission on March 13, 1995 (as amended) and incorporated herein
      by reference.

(10)  Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) filed 
      with the Commission on November 14, 1994.

(11)  Filed as an exhibit to the Company Form 10-Q/A-1 (File No. 0-20117) for 
      the quarter ended September 30, 1994 filed with the Commission on March
      13, 1995.

(12)  Filed as an exhibit to the Company's Form 10-K (File No. 0-20117) for 
      the year ended December 31, 1994 and incorporated herein by reference.

(13)  Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for 
      the quarter ended March 31, 1995 and incorporated herein by reference.

(14)  Filed as an exhibit to the Company's Form 10-Q (File No. 0-20117) for 
      the quarter ended June 30, 1995 and incorporated herein by reference.
<PAGE>   52
(15)  Filed as an exhibit to the Company's Form 8-K (File No. 1-12574) 
      initially filed with the Securities and change Commission on October 6,
      1995 and incorporated herein by reference.

(16)  Filed as an exhibit to the Company's Form 10-Q (File No. 1-12574) for 
      the quarter ended September 30, 1995 and incorporated herein by reference.

(17)  Filed as an exhibit to the Company's Form 10-Q (File No. 1-12574) for 
      the quarter ended March 31, 1996 and incorporated herein by reference.

(18)  Filed as an exhibit to the Company's Form 10-Q (File No. 1-12574) for 
      the quarter ended June 30, 1996 and incorporated herein by reference.

(19)  Filed as an exhibit to the Company's Form 10-Q (File No. 1-12574) for 
      the quarter ended September 30, 1996 and incorporated herein by reference.

<PAGE>   1





                                                                   EXHIBIT 10.58

                    THIRD AMENDMENT TO CONSULTING AGREEMENT

         This THIRD AMENDMENT TO CONSULTING AGREEMENT (the "Amendment") is made
as of the 1st day of January 1997 (the "Effective Date"), by and between JOHN
M. PIETRUSKI, an individual residing at 27 Paddock Lane, Colts Neck, New Jersey
07722 ("Consultant"), and TEXAS BIOTECHNOLOGY CORPORATION, a Delaware
corporation located at 7000 Fannin Street, Suite 1920, Houston, Texas 77030
(the "Corporation").

         WHEREAS, the Corporation and Consultant have entered into that certain
Consulting Agreement, dated January 1, 1992 (the "Agreement"), as set forth in
Exhibit "A" attached hereto and incorporated herein by reference; and

         WHEREAS, pursuant to the Agreement, the Corporation has retained
Consultant to provide consulting services to the Corporation with respect to
corporate governance, business development and other such matters; and

         WHEREAS, the Corporation and Consultant desire to amend the Agreement
as herein set forth.

         NOW, THEREFORE, for and in consideration of the foregoing and of the
mutual covenants contained herein, the parties hereto agree as follows:

         1.  Definitions.  If not otherwise defined herein, all capitalized
terms used herein shall have their respective meaning assigned to them in the
Agreement.

         2.  Amendment to Section 2.  Effective as of the date hereof, Section
2 of the Agreement is hereby amended by deleting paragraph (a) in its entirety
and substituting the following in lieu thereof:

                 "(a) Consultant's retention under this agreement shall
         commence on the date hereof (the "Commencement Date") and shall end on
         the earliest of:  (i) the death or disability (as defined herein) of
         Consultant; (ii) the termination of Consultant's retention by the
         Corporation for cause (as defined herein); or (iii) two years after
         the Effective Date.  After the expiration of such two-year period,
         this Agreement may be renewed for additional periods on all the
         remaining terms and conditions set forth herein upon mutual agreement
         of Consultant and the Corporation."

         3.  The terms and provisions set forth in this Amendment shall modify
and supersede all inconsistent terms and provisions set forth in the Agreement
and except as expressly modified and superseded by this Amendment, the terms
and provisions of the Agreement are ratified and confirmed and shall continue
in full force and effect.  Corporation and Consultant agree that the Agreement
as amended shall continue to be legal, valid, binding and enforceable in
accordance with its terms.
<PAGE>   2
         4.  Except as expressly modified or amended hereby, the terms and
provisions of the Agreement shall remain in force and effect in accordance with
the terms hereof; provided, however, that from and after the date hereof any
reference to the Agreement shall be deemed and construed as meaning the
Agreement as amended and modified hereby.

         IN WITNESS WHEREOF, the parties have executed this Amendment as of the
day and year first written above.



                                     CONSULTANT:
                              
                                     /s/ JOHN M. PIETRUSKI   
                                     ----------------------------------------
                                     John M. Pietruski
                              
                              
                              
                                     CORPORATION:
                              
                                     TEXAS BIOTECHNOLOGY CORPORATION
                              
                                     /s/ DAVID B. MCWILLIAMS             
                                     ----------------------------------------
                                     David B. McWilliams
                                     President and Chief Executive Officer
<PAGE>   3



                                  (EXHIBIT A)

                        TEXAS BIOTECHNOLOGY CORPORATION

                              CONSULTING AGREEMENT

                                      with

                               JOHN M. PIETRUSKI

      
      AGREEMENT, dated as of January 1, 1992, between JOHN M. PIETRUSKI
("Consultant"), residing at 3 Bruce Court, Edison, New Jersey 08820, and TEXAS
BIOTECHNOLOGY CORPORATION (the "Corporation"), a Delaware corporation, having
an address at Doctors Center, 7000 Fannin, Suite 1920, Houston, Texas 77030.

                              W I T N E S S E T H:

      WHEREAS, the Corporation desires to retain Consultant, and Consultant
desires to accept such retention by the Corporation, on the terms and
conditions set forth below.

      NOW, THEREFORE, in consideration of the premises and mutual agreements
hereinafter contained, the parties hereto do agree as follows:

      1.  Retention.  Subject to the terms and conditions set forth herein, the
Corporation hereby retains Consultant as a consultant to the Corporation to
provide certain consulting services to the Corporation and Consultant hereby
accepts such retention.

      2.  Term.  (a)  Consultant's retention under this Agreement shall
commence on the date hereof (the "Commencement Date") and shall end on the
earliest of: (i) the death or disability (as defined herein) of Consultant;
(ii) the termination of Consultant's retention by the Corporation for cause (as
defined herein); or (iii) one year after the Commencement Date.  After the
expiration of such one-year
<PAGE>   4

                                     -2-

period, this Agreement may be renewed for an additional one-year period on all
the remaining terms and conditions set forth herein upon the mutual agreement
of Consultant and the Corporation.

      (b)  For the purpose of this Section 2, "disability" shall mean any
physical or mental illness or injury as a result of which Consultant fails to
devote at least fifty-two working days per year (roughly equivalent on average
to one day per week) to the rendition of consulting services hereunder for a
continuous period of 90 days during any 365-day period.  Disability shall
occur upon the end of such 90-day period.

      (c)  For the purpose of this Section 2, "cause" shall exist if Consultant
(i) without the prior written consent of the Corporation, assigns, pledges or
otherwise disposes of his rights or obligations under this Agreement, or
attempts to do the same, (ii) breaches any of the material terms or conditions
hereof including, without limitation, any of the terms of Sections 8, 9, 10 or
11; (iii) engages in willful misconduct or acts in bad faith; or (iv) commits a
felony or perpetrates a common law fraud against the Corporation.

      3.  Compensation.  During the term hereof, and subject to the performance
of the services required to be performed hereunder by Consultant, the
Corporation shall pay to Consultant for all services rendered by Consultant
under this Agreement fees at a rate of $75,000 per annum.  The fees due
Consultant under this Agreement shall be payable quarterly on January 15, April
15, July 15 and October 15. In addition, promptly after Consultant executes
this Agreement he will be granted an option to purchase up to 150,000 shares of
the Corporation's common stock, at a purchase price of $.50 per share, in
accordance with the Corporation's 1990 Incentive Stock Option Plan.

      4.  Services.  (a)  Consultant shall provide consulting services to the
Corporation with respect to corporate governance and business development and
such other matters, within the unique experience
<PAGE>   5


                                     -3-

and expertise of Consultant, as may be mutually agreed upon provided, that,
Consultant shall not be required to provide any professional medical services.

      (b)  In furtherance of his obligations hereunder, Consultant will devote
approximately 52 working days per year (roughly equivalent, on average, to one
working day per week) to his services hereunder and shall provide such services
at such places and on such days as may be mutually agreed upon.  In addition,
Consultant shall also generally make his services available to the Corporation
over the telephone.

      5.  Expenses.  The Corporation shall reimburse Consultant, in accordance
with the Corporation's standard policy, for the travel expenses of Consultant
incurred at the request of the Corporation for travel and other related
reasonable expenses.  Except as aforesaid or unless otherwise agreed to with
respect to the rendition of specific services, the Corporation shall have no
liability to reimburse Consultant for any expenses incurred by Consultant in
connection with this Agreement.

      6.  Status of Parties.  Consultant will at all times act as an
independent contractor and not as an employee of the Corporation.  The manner
in which Consultant renders services to the Corporation will be within his sole
control and discretion.  However, Consultant will cooperate with the
Corporation's personnel and use his best efforts on behalf of the Corporation.

      7.  Indemnification.  During the term of this Agreement and for a period
of three years thereafter, the Corporation shall indemnify Consultant and hold
him harmless for any loss, claim, demand, damages or otherwise, including
reasonable attorney's fees, with respect to any threatened or pending action or
proceeding arising out of or in connection with Consultant's carrying out his
duties hereunder.

      8.  Proprietary Rights.  Any  and all patentable and unpatentable
inventions, discoveries, ideas or applications conceived, originated or
developed by Consultant, or developed by others for or on behalf of
<PAGE>   6

                                     -4-


the Corporation of which Consultant becomes informed, during the term hereof
and relating to the Corporation's business shall be the sole and exclusive
property of the Corporation throughout the world.  Consultant, at the request
and sole expense of the Corporation, shall execute such documents and perform
such acts as the Corporation or its counsel may deem necessary or advisable to
confirm in the Corporation all right, title and interest throughout the world
in and to any such invention, discovery or idea, and all patent applications,
patents and copyrights thereon, and to enable and assist the Corporation in
procuring, maintaining, enforcing and defending patents, copyrights and other
applicable statutory protection throughout the world on any such invention,
discovery, idea or application which may be patentable or copyrightable.

      9.  Secrecy and Nondisclosure.  Without the prior written consent of the
Corporation in each instance, Consultant agrees to treat as secret and
confidential all of the processes, methods, formulas, procedures, techniques,
software, designs, data, drawings and other information which are not of public
knowledge or record pertaining to the Corporation's business of which
Consultant becomes informed, and Consultant agrees not to disclose, use,
publish, or in any other manner reveal, directly or indirectly, at any time
during or after the term of this Agreement, any such processes, methods,
formulas, procedures, techniques, software, designs, data, drawings and other
information pertaining to the Corporation's business.

      10.  Non-Competition.  (a)  Consultant agrees that, unless consented to
in writing by the Corporation after complete disclosure by Consultant of his
proposed activities, during the term of this Agreement and for a period of six
(6) months after the termination of his consulting services to the Corporation
he
<PAGE>   7


                                     -5-
                                                            -
will not directly or indirectly, for his own account or as an employee,
officer, director, partner, joint venturer, shareholder, investor, consultant
or otherwise:

               (i)  Anywhere in the world interest himself in or engage in any
           projects which are competitive with significant projects in which
           the Corporation is engaged or is actively contemplating engaging
           during the term of this Agreement or at the time of such
           termination;

               (ii)  Hire, engage or employ or solicit, contact or communicate
           with for the purposes of hiring, employing-or engaging, any person
           who is then or was an employee of the Corporation at any time within
           the 12-month period immediately prior thereto.

      (b)  Nothing in this Section 11 shall be construed to prevent Consultant
from holding stock as an investor in a corporation whose stock is publicly
traded and in which Consultant holds less than 5% of the outstanding shares.

      (c)  Consultant acknowledges that the restricted period of time and
geographical area specified under Section 11(a) hereof are reasonable, in view
of the nature of the business in which the Corporation is engaged and
Consultant's knowledge of the Corporation's business.

      (d)  Notwithstanding anything contained in this Section 11 to the
contrary, if the period of time or the geographical area specified under
Section 11(a) hereof should be determined to be unreasonable in any judicial
proceeding, then the period of time and area of the restriction shall be
reduced so that this Agreement may be enforced in such area and during such
period of time as shall be determined to be reasonable.

      11.  Mutual Representations.  Each party hereto represents and warrants
to the other that:

      (a)  The execution and delivery of this Agreement and the fulfillment of
the terms hereof (i) will not constitute a default under or conflict with any
agreement or other instrument to which he or it is a
<PAGE>   8


                                     -6-

party or by which he or it is bound and (ii) do not require the consent of any
person, or entity; and

      (b)  This Agreement constitutes the valid and binding obligation of such
party enforceable against such party in accordance with its terms subject to
applicable bankruptcy, insolvency, moratorium and similar laws affecting
creditors rights generally, and subject, as to enforceability, to general
principles of equity (regardless if enforcement is sought in a proceeding in
equity or at law).

      12.  Waiver.  Failure to insist upon compliance with any of the terms,
covenants, or conditions hereof shall not be deemed a waiver of such term,
covenant, or condition, nor shall any waiver or relinquishment of any right or
power hereunder at any one time or more times be deemed a waiver or
relinquishment of such right or power at any other time or times.

      13.  Severability.  The invalidity or unenforceability of any provision
hereof shall in no way affect the validity or enforceability of any other
provision.  The parties to this Agreement agree and intend that this Agreement
shall be enforced as fully as it may be enforced consistent with applicable
statutes and rules of law.

      14.  Benefit. Except as otherwise herein expressly provided, this
Agreement shall inure to the benefit of and be binding upon the Corporation,
its successors and assigns, including, without limitation, any corporation
which may acquire all or substantially all of the Corporation's assets or
business or with or into which the Corporation may be consolidated or merged,
and to the benefit of, and be binding upon, Consultant, his heirs, executors,
administrators and legal representatives.

      15.  Entire Agreement. This Agreement constitutes the entire
understanding and agreement between the parties hereto, supersedes any and all
prior discussions, agreements and correspondence with
<PAGE>   9


                                     -7-

regard to the subject matter hereof, and may not be amended, modified or
supplemented in any respect, except by a subsequent writing executed by both
parties hereto.

                 16.  Notices. Any notice or other communication required or
permitted hereunder shall be in writing and shall be delivered personally,
telegraphed, telexed, sent by facsimile transmission or sent by certified,
registered or express mail, postage prepaid.  Any such notice shall be deemed
given when so delivered personally, telegraphed, telexed or sent by facsimile
transmission or, if mailed, five days after the date of deposit in the United
States mails, as follows:


                   (i)  if to Consultant, to:

                        John M. Pietruski
                        3 Bruce Court
                        Edison, New Jersey 08820

                   (ii) if to the Corporation, to:

                        Texas Biotechnology Corporation
                        Doctors Center
                        7000 Fannin
                        Suite 1920
                        Houston, Texas 77030
                        Attention: President

                        with a copy to:

                        Cahill Gordon & Reindel
                        80 Pine Street
                        New York, New York 10005
                        Attention: Jonathan I. Mark, Esq.


    Any party may by notice given in accordance with this Section to the other
parties designate another address or person for receipt of notices hereunder.
<PAGE>   10


                                     -8-

      17.  Applicable Law.  This Agreement shall be governed by, and construed
and enforced in accordance with, the laws of the State of New York without
giving effect to principles of conflicts of law.

      18.  Jurisdiction. The parties agree that the federal and state courts
located in the State of New York shall have jurisdiction to settle any disputes
that may arise out of or in connection with this Agreement and that,
accordingly, any suit, action or proceeding arising out of or in connection
with this Agreement may be brought in such courts.  In connection with any
such litigation, each party waives all rights to a trial by jury and personal
service of any summons, complaint or other process and agrees that the service
thereof may be made by certified or registered mail.  In the alternative, any
such service may be effected in any other form or manner permitted by law.

      19.  Counterparts. This Agreement may be executed in one or more
counterparts but all such separate counterparts shall constitute but one and
the same instrument; provided that, although executed in counterparts, the
executed signature pages of each of such counterparts may be affixed to a
single copy of this Agreement which shall constitute an original.
<PAGE>   11


                                     -9-

      IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

                              
WITNESSED BY:                         TEXAS BIOTECHNOLOGY CORPORATION
                              
/s/ Catherine W. Ortlieb              By: /s/ David W. Ortlieb                  
- ------------------------------            --------------------------------------
                                                                               
/s/ Stephanie McClure                 By: /s/ John M. Pietruski                
- ------------------------------            --------------------------------------
                                          JOHN M. PIETRUSKI                 
 

<PAGE>   1
                                                                   EXHIBIT 10.59


Synthelabo

                                                               January  14, 1997


David B. McWilliams
TEXAS BIOTECHNOLOGY CORPORATION
7000 Fannin, Suite 1920
Houston, Texas 77030

                                                                   (VIA COURIER)


re: License and Research Development Agreement dated October 11, 1994


Dear David,

I refer to the License and Research Development Agreement between Texas
Biotechnology Corporation ("TBC") and Synthelabo S.A. ("Synthelabo") dated
October 11, 1994, as amended (hereinafter the "Research Agreement").  Any
capitalized terms not defined herein shall have the meanings attributed to them
in the Research Agreement.

This letter will serve as the agreement of TBC and Synthelabo to amend the
provisions of Section 4.2(c) of the Research Agreement by deleting the
requirement that Synthelabo make research payments of $750,000 on each of
January 31, April 30, July 31 and October 31, 1997.  TBC further agrees that
the last research payment which has been made by Synthelabo in the amount of
$750,000 for the quarter ended January 31, 1997 fully satisfies any and all
obligations of Synthelabo to make any research payments under Section 4.2(c) of
the Research Agreement.

TBC and Synthelabo further agree that Section 3.1 of the Research Agreement is
amended by deleting the third and fourth sentences of Section 3.1, and
inserting in lieu thereof the following: "TBC shall conduct the research
relating to the FGF Program in a manner reflecting the reduced research
payments provided by Synthelabo, which research will be conducted by
approximately four scientists working on a full-time basis.

Additionally, TBC and Synthelabo agree that the third sentence of Section 10.2
of the Research Agreement is amended to provide that the date of October 15,
1996 set forth therein is hereby changed to October 15, 1997.

Except as set forth in this letter agreement and any prior amendments, the
Research Agreement otherwise remains in full force and effect.
<PAGE>   2





If the above accurately reflects your agreement please execute the two
originals of this letter and return one to the undersigned.




SYNTHELABO

By: Marc Guyader, Ph.D.                    
    ---------------------------------------

Title: Executive Vice President            
       ------------------------------------

Date:  January 16, 1996
       ----------------

                                        Accepted and Agreed to:
                                    
                                        TEXAS BIOTECHNOLOGY CORPORATION
                                    
                                        By:  /s/ David B. McWilliams          
                                             -----------------------------------
                                                                                
                                        Title:  President                       
                                                --------------------------------
                                                                                
                                        Date:   02/19/97                        
                                                --------------------------------
                                                                                

<PAGE>   1
                                                                    EXHIBIT 23.1





                         Independent Auditors' Consent



The Board of Directors
Texas Biotechnology Corporation:


We consent to incorporation by reference in the registration statements (Nos.
33-79656, 33-79658, 3379670, 33-93282 and 33-93368) on Form S-8 and (Nos.
33-92152 and 333-03433) on Form S-3 of Texas Biotechnology Corporation of our
report dated February 21, 1997 relating to the consolidated balance sheets of
Texas Biotechnology Corporation and subsidiary as of December 31, 1996 and
1995, and the related consolidated statements of operations, stockholders'
equity, and cash flows for the years ended December 31, 1996, 1995 and 1994,
and the period from August 2, 1989 (date of incorporation) to December 31,
1996, which report appears in the December 31, 1996 annual report on Form 10-K
of Texas Biotechnology Corporation.





                                                           KPMG PEAT MARWICK LLP


Houston, Texas
March 7, 1997

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