GENITAL ANOMALIES AND RISK FOR TESTICULAR CANCER IN DANISH MEN

In a cohort of Danish boys characterized by (1) being born between 194 1 and 1957, (2) having attended schools in a defined area of Denmark, and (3) having a school health record available, 183 were registered i n the Danish Cancer Registry with testicular cancer diagnosed before J anuary 1, 1985. We selected 366 age- and sex matched controls from the same cohort. Using information recorded by school physicians, we perf ormed logistic regression analyses to estimate the relative risks (RR) associated with various genital anomalies. We found the risk for test icular cancer to be raised for men with a history of cryptorchidism [R R = 5.2; 95% confidence interval (CI) = 2.1-13.0], inguinal hernia (RR = 1.8; 95% CI = 0.9-3.7), hypospadias (RR = 4.2; 95% CI = 0.4-42.7), and hydrocele (RR = 2.4; 95% CI = 0.6-9.0). We observed no decrease in the risk associated with cryptorchidism after correction of the malde scent in early childhood. The RR of testicular cancer in the contralat eral, normally descended testis in unilateral cryptorchid men was incr eased to 3.6. The results add to the growing evidence for a common cau sal factor for both testicular cancer and cryptorchidism and support t he findings from other studies of associations between other genital a nomalies involving the closure of the processus vaginalis and the risk of testicular cancer.