Effect of FCGR genotypes and rituximab PK. (A) Arithmetic mean ± SD serum concentration-time profiles of rituximab in patients grouped by FCGR2A genotypes, (B) Arithmetic mean ± SD serum concentration-time profiles of rituximab in patients grouped by FCGR3A genotypes with their polymorphism. Only data for 3 cycles (1, 3, and 6) are displayed from a total of 19 patients.