RESUMEN
Estrogen, progesterone and glucocorticoid receptors were determined in samples obtained by trepanobiopsy before treatment and in surgical material following chemo- or radiotherapy in 131 Stage III a, b, c breast cancer patients. The levels and distribution of the receptors in bioptates coincided with the data obtained earlier for the surgical material from patients, who didn't receive presurgical therapy. It is concluded that breast tumor trepanobioptates may be used for the determination of tumor receptor status. Radiotherapy affected the level and frequency of occurrence of steroid hormone receptors. The degree of variations depended on the dosage of irradiation and after exposure period. After presurgical chemotherapy the percent of receptor-positive tumors increased.