Osteogenic sarcoma producing human chorionic gonadotrophin. Case report with immunohistochemical studies.

An osteogenic sarcoma occurring in a 22-year-old woman was found to be associated with production of a large amount of beta human chorionic gonadotrophin (B-hCG). Pregnancy was excluded on the basis of a normal ultrasonogram and a proliferative type endometrium obtained by curettage. A homogenate of the tumor was strongly positive for B-hCG while immunohistochemical staining of the tumor cells was strongly positive for B-hCG and negative for pregnancy associated glycoprotein. These results indicate ectopic production of hCG by the osteosarcoma.