ImmunoGen, Inc. announced that in connection with the Merger, effective as of the Effective Time, Stephen C. McCluski, Stuart A. Arbuckle, Mark J. Enyedy, Mark A. Goldberg, Tracey L. McCain, Dean J. Mitchell, Kristine Peterson, Helen Thackray, and Richard J. Wallace ceased to be members of the Company?s board of directors or any committee thereof.