An in vitro study by Dall’Ozzo et al. reported that the concentration of rituximab needed for 50% lysis (EC50) of a Burkitt lymphoma cell line by natural killer (NK) cells from healthy donors who had the FCGR3A 158 V/V genotype was 4.2 times lower than that observed with NK cells from donors who had FCGR3A 158 F/F [25]. Here, FCGR3A is linked to Burkitt lymphoma.