Safety and Clinical Activity of the Anti-CD22 Immunoconjugate Inotuzumab Ozogamicin (CMC-544) in Combination with Rituximab in Follicular Lymphoma or Diffuse Large B-Cell Lymphoma: Preliminary Report of a Phase 1/2 Study

Abstract Inotuzumab ozogamicin (CMC-544) is an antibody-targeted chemotherapy agent composed of a humanized CD22 antibody, conjugated to calicheamicin, a potent cytotoxic antitumor agent. Inotuzumab ozogamicin targets B-cell malignancies since they often express CD22. In a previously reported phase 1 dose-escalation trial in patients with CD22-positive B-cell non-Hodgkin’s lymphoma (NHL), the maximum tolerated dose (MTD) was determined to be 1.8 mg/m2 every 4 weeks. Responses were seen in patients with both follicular lymphoma (FL) and diffuse large B-cell lymphoma (DLBCL). This ongoing study consisted of a limited dose escalation (DE) portion to confirm the MTD of inotuzumab ozogamicin whe…