Survival of systemic mastocytosis patients. (A) The observed Kaplan-Meier survival for systemic mastocytosis patients (red) compared with the expected age- and sex-matched US population's survival (blue). (B) The observed Kaplan-Meier survival for systemic mastocytosis patients classified by disease type ISM (red), ASM (green), AHNMD (yellow), and MCL (purple) compared with the expected age- and sex-matched US population's survival (blue) for the entire cohort.