GSTM1 and retinoblastoma: There was no significant difference noted for gender (p=0.785), mean age (p=0.347), hemoglobin (Hb) (p=0.605), total leucocyte count (TLC) (p=0.702), and platelet count (PC) (p=0.253) in cases of retinoblastoma with and without bone marrow metastasis.