Cumulative incidence of VTE. (A) Cumulative VTE incidence in patients with blood type O (n = 653) compared with patients with blood type non-O (n = 1055). (B) Cumulative VTE incidence in patients with intermediate/low-risk tumor types with blood type O (n = 522) compared with patients with blood type non-O (n = 856). (C) Cumulative VTE incidence in patients with very high-risk tumor types with blood type O (n = 131) compared with patients with blood type non-O (n = 196). Cumulative incidence functions were obtained within a competing risk framework considering all-cause mortality as a competing event.