Abstract: This paper reports serum β₂ microglobulin （β₂mG） and serum human chorinoic gonudotropin （HCG） levels in 62 patients with choriocarcinoma, hydatidiform mole and other gynaecological conditions. The results show that there is not significant relationship between serum β₂mG and HCG levels, and suggest that secreting sections of them are not the same.