WALTHAM, Mass.--(BUSINESS WIRE)--ImmunoGen, Inc. (Nasdaq: IMGN), a biopharmaceutical company that develops targeted anticancer therapeutics, today announced the presentation of encouraging initial clinical findings with SAR3419 at the American Society of Hematology (ASH) 51st Annual Meeting and Exposition. Among the findings reported were responses to SAR3419 – administered as a single agent – among patients with B-cell non-Hodgkin’s lymphoma that is refractory to treatment with rituximab (Rituxan®).