A Tale of Two MABs: Blinatumomab and Inotuzumab in COG Clinical Trials for Relapsed B ALL (C211)

4:45 –5:45 pm Thursday, September 13

coglogo

1CNE  Survival for pediatric patients with relapsed B lineage acute lymphoblastic leukemia (ALL) is sub-optimal. Traditionally, treatment protocols for relapsed ALL have relied on cytotoxic chemotherapy. Despite substantial acute and long-term toxicity, there has been no significant improvement in survival in patients treated on these protocols over the past several decades. Chemoresistance is commonly cited as a reason for treatment failure. Treatment failure is defined as either the inability to achieve clinical remission post-relapse or a subsequent relapse following traditional therapy that includes intensified chemotherapy with or without stem cell transplant. The ideal therapy would be the use of a cellular targeted approach that destroys leukemia cells but spares other cells and improves response and survival while minimizing distressing and sometimes life-threatening toxicities. Early phase clinical trials with the synthetic antibodies Blinatumomab (BiTE) and Inotuzumab (INO) have shown great promise in achieving clinical response in heavily pre-treated pediatric and adult patients with relapsed and refractory ALL. This session will detail the targeted approach of these novel antibodies and their unique mechanisms of action: Blinatumomab modulates the immune system to destroy cancer cells, while Inotuzumab provides a link to deliver cytotoxic treatment directly to the cancer cell. These two novel agents will be compared, including their reported efficacy from early phase trials, toxicity profiles, and administration principles. Highlights from the current COG clinical trials AALL1331 and AALL1621 will be reviewed, with a focus on the uniqueness of each trial, including phase type and eligibility criteria. Additionally, AALL1331 has been activated since December 2014, providing an opportunity to share clinical examples and practical tips regarding the nursing care of patients receiving Blinatumomab.