Incidence Of Reduced Penis Size Among Men With Recurrent Prostate Cancer Previously Treated With Surgery, Radiation Plus Androgen Deprivation, Or Radiation Alone

38 Background: The relative incidence of reduced penis size across prostate cancer treatment modalities is not well-known.The incidence of physician-reported patient complaints about reduced penis size was calculated for 948 men in the COMPARE registry who experienced PSA failure and were assessed a median of 5.45 (2.6-8.9 IQ range) years after prostatectomy or radiation (RT) consisting of either external beam or brachytherapy. Multivariable logistic regression was used to determine factors associated with poorer sexual function and incontinence.Of 948 men, 25 (2.63%) complained of a reduced penis size. The incidence of reduced penis size by treatment was: surgery (19/510=3.73%), RT plus androgen deprivation therapy (ADT) (6/225=2.67%), RT without ADT (0/213=0%). Surgery (p=0.004) and RT+ADT (p=0.016) had significantly more short penis complaints than RT alone. Rates of shortened penis for surgery and for RT+ADT were similar (p=0.47). On multivariable analysis adjusting for age and treatment type, short penis was associated with poorer sexual function (Odds ratio: 2.430, 95% CI: 1.046-5.643) (p=0.0389) and more incontinence (Odds ratio: 4.671, 95% CI: 1.985-10.994) (p=0.0004).Complaints about reduced penis size were more common with RT+ADT or surgery than with RT alone, and were associated with poorer sexual function and incontinence issues.