Kaplan-Meier estimates of overall survival of 38 SM patients with respect to the individual mutation status irrespective of disease subtype: 12 patients with KIT D816V alone (ISM, n = 7; SSM, n = 2; ASM, n = 3) vs 26 patients with KIT D816V + at least one additional mutation (ISM, n = 3; SM-AHNMD, n = 4, ASM: n = 19). Patients with KIT D816V only are depicted by the continuous line; patients with additional mutations are depicted by the dashed line.