GSTM1 and lymphopenia: Complete blood count of DG demonstrated a significant (P < 0.05) erythrocytosis (marked by the significant (P < 0.05) raises in RBC, Hb, PCV and MCV) accompanied by significant neutrophilic leukocytosis (P < 0.05) and severe (P < 0.05) lymphopenia (Table 6).