Estrogen and progesterone receptors in breast carcinoma and in nonmalignant breast tissue.

Since 1983 we have studied the relationship, in the same patient, between receptor status in breast carcinoma and in nonmalignant breast tissue. Fifty patients have been evaluated to date. The total unoccupied cytosol estrogen and progesterone receptors were determined by a dextran-coated charcoal method. In nonmalignant breast tissue we found a measurable receptor concentration above the sensitivity of the method in 62% of cases for estrogen receptors and in 44% of cases for progesterone receptors. No relationships were found between the receptor level of each tumor and that of the corresponding benign tissue. The data suggest that the levels of the receptors in the tumor and in the nonmalignant tissue are totally independent.