[Micro-analysis of hormone receptors in needle biopsies of human mammary lesions and tumors. Determination of estrogen receptors].

Estrogen receptors measurement was assayed in human mammary tumors as well as corresponding fine needle aspiration biopsies (95 cases). Correlations between these two determinations were highly significant just as correlations between aspiration biopsies of the same tumor. Some factors may disturb the quality of aspiration biopsy results particularly: 1) a low number of tumoral cells expressed by the cell density, 2) ratio: sample weight-cytosol volume lower than 1/17 corresponding to a too grent dilution, 3) a sample weight lower than 20 mg.