Comparison of immunological reactivity of glycoprotein antigens extracted from individual cases of mucinous and serous ovarian adenocarcinomas was performed taking into account the immunological relationship with carcinoembryonic antigen (CEA), nonspecific cross-reacting antigen (NCA), alpha-1-antichymotrypsin, and alpha-1-acid glycoprotein. In all immunological tests, the specific immune sera against perchloric acid extracts of ovarian mucinous and serous cystadenocarcinomas and antisera against the reference antigens mentioned above were used. It was established that: 1) ovarian mucinous and serous adenocarcinomas are immunologically different and possess various tumor-associated antigens, 2) ovarian mucinous adenocarcinomas contain considerable amounts of CEA and NCA, whereas serous type neoplasms show negligible amounts or lack of these antigens; and 3) in both types of tumors, alpha-1-antichymotrypsin and alpha-1-acid glycoprotein activities are found. Immunological data indicate that ovarian mucinous and serous adenocarcinomas derive from separate lineages of epithelium.
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