BESPONSA® (Inotuzumab ozogamicin) October 4, 2017April 5, 2020 RR FDA Approvals Acute Lymphocytic Leukemia The FDA on August 17, 2017 approved BESPONSA® for the treatment of adults with relapsed or refractory B-cell precursor Acute Lymphoblastic Leukemia (ALL). BESPONSA® is a product of Wyeth Pharmaceuticals Inc., a subsidiary of Pfizer Inc. Related Posts:MYLOTARG® (Gemtuzumab ozogamicin)