Abstract
Four postmenopausal women are described in whom breast cancer responded both to bilateral adrenalectomy and bilateral oophorectomy, and subsequently, after relapse, to estrogen therapy. This paradoxical finding demonstrates the complexity of the response of breast carcinoma to hormone manipulations. Simple estrogen dependence and estrogen suppression of pituitary mammotrophins are seen to be inadequate explanations of this phenomenon. Seven fundamental observations are listed that have to be accounted for by hypotheses concerning the endocrinology of breast cancer. It is suggested that in the past we have perhaps overlooked (1) the difficulty of extrapolating observations on experimental animal tumours to spontaneous human neoplasms, (2) the fact that there may be more than one type of breast cancer, and (3) the important role that must be played by the different tissues bearing the metastases.
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