Serum IGF-1 levels in men with advanced prostate cancer treated with the ERα agonist, GTx-758.
2013
171 Background: The insulin pathway and, in particular, insulin-like growth factor-1 (IGF-1), has been implicated in the development of prostate cancer, and serum IGF-1 levels have been associated with advanced disease. GTx-758, an ERα agonist that is being evaluated for the treatment of advanced prostate cancer, reduces serum total testosterone (T) and free T and increases SHBG. Herein, we compare the effects of GTx-758 and leuprolide on serum IGF-1 levels in men with advanced prostate cancer treated with ADT. Methods: In a Phase II study (G200705), men with advanced prostate cancer (n=159) received 1000 mg or 2000 mg of GTx-758 daily or leuprolide. Serum samples were collected from all of the men in the study and serum IGF-1 levels (ng/ml) were analyzed by a reference laboratory. All p values describe the comparison of GTx-758 treatment groups to the leuprolide treated men. Results: Through day 90, in men receiving the 1000 mg and 2000 mg doses of GTx-758 , serum IGF-1 levels were decreased by more than...
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