GSTM1 and Pancytopenia: The pancytopenia was labeled as severe if patient had two or more of the following: Hb <7 gm%, ANC <0.5*109/L, and platelet count <20*109/L.1 In pancytopenia the marrow is customarily hypocellular as a result of primary production defects, it can be due to diminution of hemopoitic cell production, ineffective haemopoiesis or may be due to peripheral devastation of cells.