CC-95251: A Novel anti-SIRP-alpha Monoclonal Antibody ADCP, antibody-dependent cellular phagocytosis; FcγR, Fc gamma receptor; NHL, non-Hodgkin lymphoma; SIRPα, signal regulatory protein alpha. Abstract 2493: Interim results from the first clinical study of CC-95251, an anti-signal regulatory protein alpha (SIRPα) antibody, in combination with rituximab in patients with relapsed and/or refractory non-Hodgkin lymphoma (R/R NHL)Paolo Strati,1 Eliza Hawkes,2 Nilanjan Ghosh,3 Joseph Tuscano,4 Quincy Chu,5 Mary Ann Anderson,6 Amar Patel,7 Michael R. Burgess,7 Kristen Hege,7 Sapna Chhagan,7 Sarandeep Boyanapalli,7 Tracey Day,7 Frank Shen,7 Amitkumar Mehta81The University of Texas MD Anderson Cancer Center, Houston, TX, USA; 2Austin Health-Austin Hospital, Heidelberg, VIC, Australia; 3Levine Cancer Institute, Charlotte, NC, USA; 4University of California, Davis, Sacramento, CA, USA; 5Cross Cancer Institute, Edmonton, AB, Canada; 6Peter MacCallum Cancer Centre, Melbourne, VIC, Australia; 7Bristol Myers Squibb, Princeton, NJ, USA; 8University of Alabama at Birmingham, Birmingham, AL, USA NHL cancer cell CD47 CC-95251 Antitumor immunity FcγR Rituximab SIRPα FcγR CD20 SIRPα Reduced negative regulation of phagocytic cells Increased ADCP Potential for enhanced adaptive immune response via increased antigen presentation Macrophage Phagocytosis + Zhang W; et al. Front Immunol 2020;11:18; Sockolosky JT, et al. PNAS 2016;113(19):E2646-54. 35 Biotherapeutic