GSTM1 and neoplasm: Murayama et al. proved that the tumor was significantly inhibited by radiation treatment accompanied with intravenous injection of Hb encapsulated in liposomes compared to treatment with radiation and unencapsulated Hb.31 Many efforts have been made to conjugate Hb with different types of polymers to create an oxygen delivery system to alleviate hypoxia and hence enhance cancer treatment.