JOINT FILING AGREEMENT
Exhibit 99.1
The
undersigned hereby agree that the Statement on Schedule 13G dated February 10,
2010 with respect to the shares of Common Stock of ImmunoGen, Inc., and any
further amendments thereto executed by each and any 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)(1) under the Securities Exchange Act of 1934, as
amended.
Dated:
February 10, 2010
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BIOTECHNOLOGY
VALUE FUND, L.P.
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INVESTMENT
10, L.L.C.
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By:
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BVF
Partners L.P., its general partner
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By:
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BVF
Partners L.P., its investment manager
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By:
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BVF
Inc., its general partner
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By:
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BVF
Inc., its general partner
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By:
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/s/
Xxxx X.
Xxxxxxx
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By:
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/s/
Xxxx X.
Xxxxxxx
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Xxxx
X. Xxxxxxx
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Xxxx
X. Xxxxxxx
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President
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President
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BIOTECHNOLOGY
VALUE FUND II, L.P.
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BVF
PARTNERS L.P.
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By:
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BVF
Partners L.P., its general partner
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By:
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BVF
Inc., its general partner
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By:
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BVF
Inc., its general partner
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By:
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/s/ Xxxx X.
Xxxxxxx
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Xxxx
X. Xxxxxxx
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By:
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/s/
Xxxx X.
Xxxxxxx
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President
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Xxxx
X. Xxxxxxx
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President
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BVF
INVESTMENTS, L.L.C.
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BVF
INC.
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By:
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BVF
Partners L.P., its manager
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By:
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/s/ Xxxx X.
Xxxxxxx
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Xxxx
X. Xxxxxxx
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By:
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BVF
Inc., its general partner
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President
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By:
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/s/
Xxxx X.
Xxxxxxx
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Xxxx
X. Xxxxxxx
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/s/ Xxxx X.
Xxxxxxx
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President
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XXXX
X.
XXXXXXX
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