Comparison of Hb, RBC, MCV, MCH, and MCHC levels between adult (12 cases) and pediatric (22 cases) groups revealed that pediatric HS patients had significantly lower Hb (P = 0.0015), RBC (P = 0.0298), MCV (P = 0.0023), and MCH (P = 0.0016) compared to adult patients(Fig. 4). Here, GSTM1 is linked to histiocytic sarcoma.