Exhibit 99.1
JOINT FILING AGREEMENT
The undersigned hereby agree that statements on Schedules 13G and/or 13D
and Forms 3, 4 and 5 with respect to the shares of common stock of OSI
Pharmaceuticals, Inc. and any amendments thereto signed by each of the
undersigned shall be filed on behalf of each of the undersigned pursuant to and
in accordance with the provisions of Rule 13d-1(k) promulgated under the
Securities Exchange Act of 1934, as amended. The undersigned hereby further
agree that this Joint Filing Agreement may be included as an exhibit to such
statements or amendments. This Joint Filing Agreement may be executed in any
number of counterparts, all of which taken together shall constitute one and the
same instrument.
Dated: As of June 26, 2006
*
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Xxxxx Xxxxxx, individually
RIDGEBACK CAPITAL INVESTMENTS LTD.
*
By:----------------------------------
Name: Xxxxx Xxxxxx
Title: Director
RIDGEBACK CAPITAL MANAGEMENT LLC.
*
By:----------------------------------
Name: Xxxxx Xxxxxx
Title: Managing Member
*By: /S/ XXX XXXXXX
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Xxx Xxxxxx, Attorney-in-Fact
Power of attorney filed as an exhibit hereto
