Perioperative hypogonadism in men undergoing radical cystoprostatectomy for bladder cancer.

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470 Background: Radical cystectomy (RC) is associated with significant morbidity, and loss of body weight is a common after RC, even in patients without significant nutritional deficiencies. Prior studies have demonstrated a high prevalence of hypogonadism (HG) in men with cancer and who undergo anesthesia/major surgery. The suppression of testosterone persists up to seven days following surgery. We hypothesize that hypogonadism is prevalent in male patients undergoing RC for bladder cancer (BC), and that it persists in the post-operative period. Methods: We implemented a prospective, IRB-approved trial (Clinical trials.gov # NCT03063125) to prospectively enroll 25 men with no prior history of treatment for HG or other hormonal disorders with a new diagnosis of non-metastatic bladder cancer undergoing RC. Pre-operative total, free testosterone and luteinizing hormone (LH) were obtained. These labs were then repeated on post-operative days 2, 3, 30, and 90. The threshold for normal total testosterone was defined as > 250 ng/dl. Demographic data were recorded. Results: Between March and September 2017, 9 patients have been enrolled into the study. Mean patient age is 68.5 years (52-85). The mean pre-operative total testosterone was 247 ng/dl (range 50-496 ng/dl) and 6/9 (66.7%) patients had HG. Two patients had abnormal pre-operative LH levels (range 21-57 mIU/L). Testosterone decreased by a mean of 99 ng/dl between pre-op assessment and post-operative day 2 [95% CI 66.2, 131.8]; all 6 men who initially had HG remained below 250 ng/dl. Two men moved from eugonadal (347 ng/dl, 316 ng/dl) to hypogonadal (213 ng/dl,192 ng/dl, respectively) by post-operative day 2. At 30 days post-op, the mean T level was 206 ng/dl. No patients had returned to levels at or above their pre-operative baseline and 8/9 (88.9%) had HG (range 40-356 ng/dl). Conclusions: Hypogonadism is prevalent in men undergoing RC; our trial demonstrates a pre- and 30 day post-operative prevalence of 66.7% and 88.9%%. Furthermore, HG persisted beyond the immediate post-operative period. Treatment of peri-operative HG with correction to a eugonadal state may represent a therapeutic intervention to reduce the morbidity associated with radical cystectomy. Clinical trial information: NCT03063125.