UGT1A1 and histiocytic sarcoma: Comparisons of laboratory findings and clinical characteristics showed no significant differences in hematologic parameters, hemolysis markers, iron status parameters, sex, family history of HS, number of splenectomized patients, and disease severity according to the gene mutation type and number of mutation or presence of UGT1A1 mutation (Table 1, Additional file 1: Table S6).