Modulation of protein expression in endometrial adenocarcinoma cells by in vitro exposure to estradiol and progesterone

Protein maps of in vitro hormone-modulated adenocarcinoma cells from an endometrial tumor are described. It is noted that mapping of tumor tissues by means of the two-dimensional analysis described by O'Farrell and associates6of 35S-methionine-labeled proteins can provide a characteristic map for each tumor and that the methionine-containing proteins of tumor cells can be independently modulated by the in vitro additions of estradiol and progesterone. Such protein modulation could be indicative of hormonal therapeutic responsiveness of individual endometrial adenocarcinomas and other hormone receptor-positive tumors. Tumor maps may further provide data for the identification and isolation of new tumor markers which might be correlated with the radiotherapeutic and chemotherapeutic sensitivity of the malignancy.