-Broad Development Plan Expected to Continue-
SOUTH SAN FRANCISCO, Calif., Jun 21, 2010 (BUSINESS WIRE) --Exelixis, Inc. (Nasdaq:EXEL) today announced that it has regained full
rights to develop and commercialize XL184. Exelixis and Bristol-Myers
Squibb Company (BMS) entered into a global development collaboration for
XL184, the clinically most advanced MET inhibitor, in December 2008.
Under the agreement, BMS and Exelixis had originally agreed to certain
clinical development plans, and Exelixis maintained key rights regarding
timing and funding of current and future clinical trials. Given the
recent progress of BMS' wholly-owned oncology pipeline and positive data
generated by XL184, Exelixis and BMS were not able to align on the
scope, breadth and pace of the ongoing clinical development of XL184. As
a result, BMS returned XL184 to Exelixis, thereby giving Exelixis the
opportunity to advance the program as originally envisioned. BMS will
make a payment to Exelixis of $17 million in connection with the return
of XL184.
"We believe in the clinical and commercial potential of XL184 in a broad
array of cancer indications. The data that we recently presented at ASCO
were encouraging," said George A. Scangos, Ph.D., president and chief
executive officer of Exelixis. "We certainly understand BMS' need to
make pipeline and prioritization decisions, but from Exelixis'
perspective, XL184 is our most advanced compound, the data are
encouraging, and we need to rapidly develop the compound in indications
justified by the data, including medullary thyroid cancer, glioblastoma,
and potentially some of the major tumor types being evaluated in the
randomized discontinuation trial. We regret BMS' decision, but we are
pleased to now have the opportunity to develop XL184 independent of
divergent pipeline and portfolio considerations. It is a sign of the
strength of our relationship that we could achieve this outcome for
XL184 at the same time that we continue our positive collaborations
around a number of other compounds. We have the resources to take XL184
forward on our own for some time and we see several attractive longer
term options, which we are currently evaluating."
XL184 Clinical Development Program
XL184 is currently being evaluated in 13 tumor types across multiple
clinical trials. As recently reported at the 2010 Annual Meeting of the
American Society of Clinical Oncology (ASCO) in early June, in an
expanded cohort in phase 1 of patients with medullary thyroid cancer,
XL184 demonstrated a 29% response rate, with a median duration of
response that had not yet been reached, with a range of 4 to 35+ months.
XL184 is currently being evaluated in a pivotal phase 3 clinical trial
in patients with medullary thyroid cancer. Assuming positive results
from the pivotal trial, Exelixis anticipates submitting a new drug
application (NDA) with the Food and Drug Administration for XL184 in
this indication in 2011. Also as reported at the 2010 ASCO Annual
Meeting, in a phase 2 clinical trial in patients with recurrent
glioblastoma, XL184 demonstrated a 30% response rate when dosed at 125
mg daily, with a median duration of response of 5.1 months. Exelixis
expects to initiate a phase 3 pivotal trial in recurrent glioblastoma in
the year-end 2010 time frame. In addition, as reported at the 2010 ASCO
Annual Meeting, objective responses with XL184 have been observed in
patients with refractory melanoma, non-small cell lung cancer (NSCLC)
(both as a single agent and in combination with erlotinib),
hepatocellular carcinoma, prostate and ovarian cancers in an ongoing
adaptive randomized discontinuation trial (RDT). Exelixis expects to
prioritize tumor types from the RDT for further development early in
2011.
The detailed safety and efficacy data regarding XL184 reported at the
2010 ASCO Annual Meeting are available in the four XL184 press releases
issued by Exelixis on May 20, 2010, which are available under
"Investors" on Exelixis' website, www.exelixis.com.
About XL184
XL184 is an investigational oral inhibitor of MET, VEGFR2, and RET that
produces antiangiogenic, antiproliferative, and antiinvasive effects in
preclinical tumor models. MET is mutationally activated in some tumor
types, such as hereditary and sporadic papillary renal cell carcinoma
and some head and neck cancers. More frequently, MET is either
over-expressed or activated in the absence of mutation in glioblastomas,
breast carcinomas, some gastric cancers, and other solid tumors. MET
amplification has been demonstrated in some NSCLCs. Expression of VEGF
has been observed in a variety of cancers and has been associated with
prognostic significance. Targeting the VEGF receptor has been recognized
as a potential anti-cancer strategy in multiple tumors. Dual targeting
of MET and VEGFR2 blocks two of the major mechanisms tumors use to
overcome hypoxia. Activated RET is involved in cell signaling cascades
that regulate cell proliferation, migration, differentiation, and
survival. RET is mutationally activated in papillary thyroid cancer
(PTC) and in both familial and sporadic forms of medullary thyroid
cancer (MTC).
About Exelixis
Exelixis, Inc. is a development-stage biotechnology company dedicated to
the discovery and development of novel small molecule therapeutics for
the treatment of cancer and other serious diseases. The company is
leveraging its biological expertise and integrated research and
development capabilities to generate a pipeline of development compounds
with significant therapeutic and commercial potential for the treatment
of cancer and potentially other serious diseases. Currently, Exelixis'
broad product pipeline includes investigational compounds in phase 3,
phase 2, and phase 1 clinical development. Exelixis has established
strategic corporate alliances with major pharmaceutical and
biotechnology companies, including Bristol-Myers Squibb Company,
sanofi-aventis, GlaxoSmithKline, Genentech (a wholly owned member of the
Roche Group), Boehringer Ingelheim, and Daiichi-Sankyo. For more
information, please visit the company's web site at http://www.exelixis.com.
Forward-Looking Statements
This press release contains forward-looking statements, including,
without limitation, all statements related to the future clinical
development of and regulatory submissions with respect to XL184 and
other Exelixis compounds (including the timing thereof), the clinical,
therapeutic and commercial potential of XL184, the receipt of $17
million from BMS, the sufficiency of Exelixis' financial and other
resources to take XL184 forward on its own for some time and Exelixis'
ability to execute longer term options for financing the XL184
development program. Words such as "expects," "will," "potential,"
"opportunity," "anticipates" and similar expressions are intended to
identify forward-looking statements. These forward-looking statements
are based upon Exelixis' current plans, assumptions, beliefs and
expectations. Forward-looking statements involve risks and
uncertainties. Exelixis' actual results and the timing of events could
differ materially from those anticipated in such forward-looking
statements as a result of these risks and uncertainties, which include,
without limitation, risks related to: the sufficiency of Exelixis'
capital, including risks related to satisfaction by Exelixis of its
obligations under its loan from GlaxoSmithKline, the risk that the
closing of the previously announced transaction with Deerfield will not
occur on the anticipated timing, or at all, due to potential failure to
satisfy the conditions to closing, and the risk that if additional
capital is not available to Exelixis, it would be forced to delay,
reduce or eliminate its product development programs efforts and may
breach its financial covenants; the potential failure of XL184 and other
Exelixis compounds to demonstrate safety and efficacy in future clinical
testing; Exelixis' dependence on current and anticipated future
collaborations; Exelixis' ability to conduct clinical trials for its
compounds sufficient to achieve a positive completion; regulatory
approval of and competition related to Exelixis' compounds and the
uncertain timing and level of expenses associated with the development
of Exelixis' programs. These and other risk factors are discussed under
"Risk Factors" and elsewhere in Exelixis' quarterly report on Form 10-Q
for the quarter ended April 2, 2010 and other filings with the
Securities and Exchange Commission. Exelixis expressly disclaims any
duty, obligation, or undertaking to release publicly any updates or
revisions to any forward-looking statements contained herein to reflect
any change in Exelixis' expectations with regard thereto or any change
in events, conditions, or circumstances on which any such statements are
based.

SOURCE: Exelixis, Inc.
Exelixis, Inc.
Charles Butler, 650-837-7277
Vice President, Corporate Communications & Investor Relations
cbutler@exelixis.com