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Exhibit 10.4(a)
AMENDMENT TO
LICENSE AGREEMENT
This Amendment ("Amendment") is made as of the 23rd day of
October, 1998, by and between Pharmacia & Upjohn AB, a
corporation organized and existing under the laws of Sweden with an
operating office at Lindhagensgatan 133, SE-11287 Stockholm, Sweden
("P&U"); and ImmunoGen, Inc., a Massachusetts corporation
with an operating office at 333 Providence Highway, Norwood,
Massachusetts 02062, USA ("ImmunoGen").
WHEREAS, the parties hereto desire to amend the License
Agreement between P&U and ImmunoGen dated as of June 1,
1998 (the "Agreement").
NOW THEREFORE, for good and valuable consideration, the receipt
and sufficiency of which is hereby acknowledged, the parties hereto
hereby agree as follows:
1.
DEFINITIONS
Capitalized terms not otherwise defined herein shall have the
respective meanings ascribed to them in the Agreement.
2.
AMENDMENTS
2.1
The Agreement is hereby amended by adding as Section 1.9 a
definition of "C242" as follows:
"C242" shall mean any antibody or fragment thereof which
binds to the same epitope as the antibody p
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