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- W2078890435 abstract "Studies were undertaken to examine the effects of an estradiol-chemical delivery system (E2-CDS) or castration (CAST) on plasma testosterone (T) and growth of the Segaloff 11095 carcinoma. Fischer 344 rats were implanted subcutaneously with the Segaloff 11095 tumor and tumor growth was monitored thereafter. After optimal tumor growth, when the average tumor size was approximately 25 x 15 mm (length x width; 4-5 g wet weight), rats were randomized into (1) testis-intact controls; (2) CAST; (3) intact+E2-CDS groups (rats received weekly injection of the E2-CDS at 0.5 mg/kg). Animals were killed 7 or 14 days after the initiation of treatments. Blood and tissue samples were collected for subsequent analysis. Plasma T levels were suppressed by 98% and 97% through 14 days after CAST or E2-CDS treatment. CAST increased plasma gonadotropin (LH) concentrations, while E2-CDS reduced LH compared to intact control levels. E2-CDS treatment increased plasma E2 levels to 24 (one injection) or 75 pg/ml (two injections) at 7 or 14 days, respectively. E2-CDS, given once a week for 2 consecutive weeks, resulted in a decreased growth of the prostate tumor by 61%, while CAST reduced the weights of these tumors by only 20%. In response to E2-CDS (one or two injections), weights of the in situ ventral prostate and seminal vesicles were significantly reduced by 70% and 50%, respectively, in tumor-bearing rats. Similarly, CAST reduced the weights of these tissues by 80% (prostate) or 52% (seminal vesicle) at 7 or 14 days after treatment. Pituitary weight increased, while testes weight decreased by 20% with two injections of E2-CDS, compared with intact control rats. Collectively, these data indicate that E2-CDS is effective in reducing the growth rate of prostatic tumors in the rat." @default.
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- W2078890435 date "1993-01-01" @default.
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- W2078890435 title "Suppression of plasma testosterone and prostate carcinoma size by a redox-based, brain-targeted estrogen delivery system in the rat" @default.
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- W2078890435 doi "https://doi.org/10.1002/pros.2990230108" @default.
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