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Immunocytochemical detection of prolactin binding sites in fine needle aspiration smears of breast lesions.

Specific prolactin (PRL) binding sites were demonstrated in the fine needle aspiration cytology (FNAC) specimens from 68 patients with benign and malignant diseases of the breast using highly sensitive technique of DNP hapten sandwich staining procedure and antibody against human PRL. In 16 patients, immunocytochemical staining was also carried out on paraffin embedded sections of corresponding lesions. FNAC specimens included 52 neoplasms and 16 non-proliferative and proliferative benign breast disease. The reaction varied in different lesions, being maximum (72%) in malignant tumours and 60 per cent in benign tumours. However, benign breast disease showed a reaction that varied with the lesion. The technique was found to be simple, sensitive and economical for demonstrating specific PRL binding sites in cytology specimens of breast lesions.