Department of Obstetrics and Gynecology, Kumamoto University Medical School, Kumamoto 860, and *Department of Obstetrics and Gynecology, Miyazaki Medical College, Japan
(Received 11 February 1976)
It has been reported that 20α-hydroxysteroid dehydrogenase (20α-HSD), catalysing the oxidation of 20α-hydroxy-4-pregnen-3-one (20α-OHP) to progesterone with NAD+ is mainly associated with the mitochondrial fraction of endometrial cells and increases progressively from the early proliferative phase until the late secretory phase (Maeyama, Nakahara, Sudo & Mori, 1973; Tseng & Gurpide, 1974). Recently Collins & Jewkes (1974) and Pollow, Lübbert, Boquoi & Pollow (1975) showed that human endometrial carcinomata do not produce significantly more 20α-OHP than proliferative endometrium and that the specific activity of 20α-HSD decreases with decreasing differentiation of the tumour. The present study was on the effect of combined administration of progestagen and oestrogen on the conversion of 20α-OHP to progesterone in human endometrial carcinomata.
Tissues of endometrial carcinomata were obtained by total hysterectomy
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