To investigate the genotype–phenotype association of all HS patients, we first divided the patients into different groups based on the mutated genes and types of mutations, separately, then analyzed their data among the groups by Kruskal–Wallis test which showed no significant differences regarding Hb level, reticulocytes, and total bilirubin among different groups (Table 3, Table 4). The gene discussed is GSTM1; the disease is histiocytic sarcoma.