ARRIS PHARMACEUTICAL CORP/DE/
DEFA14A, 1997-12-05
PHARMACEUTICAL PREPARATIONS
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                                December 5, 1997
 
To Our Investors and Friends:
 
     The pharmaceutical industry is changing. Readers of scientific and industry
publications will recognize the imperative of putting together a breadth of new
capabilities that not only identifies new targets and characterizes their
functions, but also finds the chemical entities that modulate their activity. We
believe the creation of AXYS Pharmaceuticals will position our new company on
the forefront of these changes. We will be poised to address both the
requirements and the challenges of the pharmaceutical industry's future:
 
     - AXYS will, we believe, be the only biotechnology company that combines a
       full spectrum of drug discovery technologies from genes to drugs.
 
     - AXYS will have a powerful intellectual property position in both disease
       targets and in new chemical entities. In the combination, Arris will
       enrich its portfolio of high quality biological targets; Sequana will
       access combinatorial and medicinal chemistries.
 
     - AXYS will be able to offer one-stop shopping to pharmaceutical partners.
       We believe that this will increase the value of AXYS' collaborative
       programs and eliminate the stacking of royalties that occurs when
       pharmaceutical partners must collaborate with several organizations to
       access technology and expertise.
 
     - AXYS will combine its functional genomics technologies with chemical
       compound libraries produced by combinatorial chemistry to determine not
       only those targets that are appropriate for intervention, but those that
       are amenable to small molecule drugs -- a capability we believe has
       previously been unavailable from a single source.
 
     Marrying advances in genomics and combinatorial chemistry is perhaps the
most salient of the rationales for merging, but equally important are other
prospects to create business opportunities as many of the technologies used in
gene identification and in drug discovery potentially have value beyond that
which may be tapped in our own programs. We believe we can leverage this
potential to create significant value in related businesses -- in combinatorial
chemistry, diagnostics, pharmacogenomics, protein therapeutics and in gene
therapy.
 
     Finally, we believe the merger provides AXYS a longer term opportunity to
lay a foundation that will ensure the success of a sustainable business
enterprise:
 
     - The AXYS clinical pipeline is funded by pharmaceutical partners that
       validate both companies' scientific accomplishments. Research
       partnerships with Amgen, Bayer, Boehringer
       Ingelheim, Boehringer Mannheim, Bristol-Myers Squibb, Glaxo Wellcome,
       Memorial Sloan Kettering, Merck, Parke-Davis, Pharmacia & Upjohn and
       SmithKline Beecham provide opportunities to expand collaborative scope
       and a track record to point to in pursuing broader, more lucrative
       agreements.
 
     - Programs at Sequana and Arris today combine proprietary discovery targets
       with critical mass in a single therapeutic area -- cancer. This
       "infrastructure" has the potential to attract a significant strategic
       partner to provide near term funding in exchange for exclusive geographic
       marketing rights, an essential building block for the creation of a
       self-sustaining business with proprietary research, a clinical pipeline,
       and ultimately, products.
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December 5, 1997

Page 2
 
     Last but not least, we believe AXYS will have the financial resources it
will need to succeed:
 
     - A partnership portfolio with a deal value at announcement of more than
       $500 million that provides ongoing research support to a broadly-based
       research pipeline.
 
     - Approximately 335 researchers of which 114 are PhD's and MD's.
 
     - A more than $40 million investment in plant, property and equipment.
 
     - More than $100 million in cash and equivalents.
 
     We believe the combination of Arris and Sequana is one that uniquely
enables the newly-created AXYS Pharmaceuticals to build value that neither
company could have achieved alone.
 
     With both breadth and depth in technology as well as therapeutic
opportunities, we believe AXYS is poised to provide significant returns on the
investments we will make to integrate Sequana's genomics capability and Arris'
proven drug discovery strengths.
 
                                          Sincerely,

                                          /s/ John P. Walker
                                          ----------------------
                                          John P. Walker
                                          President
                                          Chief Executive Officer
 
     The merger of a subsidiary of Arris with and into Sequana is described more
fully in the Joint Proxy Statement/Prospectus sent to Arris stockholders. Arris
stockholders should read the Joint Proxy Statement/Prospectus in its entirety
before determining whether or not to vote in favor of the issuance of shares in
connection with the Sequana transaction and the related proposals at the Arris
Special Stockholders' Meeting. This letter contains forward-looking statements
that involve risks and uncertainties. Arris' and Sequana's actual results may
differ materially from those anticipated in those forward-looking statements as
a result of certain factors, including those discussed in the Joint Proxy
Statement/Prospectus and in the documents incorporated therein by reference.
Such risk factors should be considered carefully by Arris stockholders in
determining whether or not to vote in favor of the issuance of shares of Arris
Common Stock in the merger and the related proposals.


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