FCGR3A and follicular lymphoma: Conversely, clinical studies have shown that FcγRIIa-131H/H and FcγRIIIa-158 V/V genotypes (simplified here as FcγRIIa H/H and FcγRIIIa V/V) are associated with improved response and efficacy in follicular lymphomas and metastatic breast carcinomas treated with rituximab and trastuzumab [14–16], respectively.