Abstract
The immunohistochemical reactivity of three monoclonal antibodies, generated against human milk fat globule membranes (HMFG), were studied using peroxidase conjugated secondary antibody or avidin-biotin-peroxidase complex method. Two of the antibodies, III E 8 and III H 2 showed rather broad reactivity, staining all mammary, ovarian, endometrial, cervical and bronchial adenocarcinomas. They also stained all pancreatic adenocarcinomas but only 30% of the carcinomas of the colon. Reaction with prostatic and renal adenocarcinomas varied. No reaction was seen with squamous or transitional cell carcinomas. Antibody III D 5, which previously has been shown to recognize an estrogen receptor activation associated antigen in mammary carcinomas, stained 60% of mammary or gynegological adenocarcinomas. This antibody had a more limited reactivity with other tissues as well, as all intestinal carcinomas were negative. It stained all bronchial adenocarcinomas, however, and 50% of the prostatic carcinomas. The three monoclonal antibodies, althought not specific, show a more restricted reactivity than the so far described HMFG antibodies and they may therefore be of value in histopathological diagnosis.

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