Clinical trials with CD19-directed CARs have achieved unprecedented remission rates as high as 90%. However, recent follow-up studies have shown a substantial portion of treated patients relapsed due to antigen escape. CD20-CD19 cCAR is a compound Chimeric Antigen Receptor (cCAR) immunotherapy with two distinct functional CAR molecules expressed on a T-cell, directed against the surface proteins CD20 and CD19. CD20-CD19 cCAR intends to target the mechanisms of single-CAR relapse, specifically antigen escape.
