Wang Y, et al. - Experts ascertained whether or not androgen receptor (AR) polymorphic CAG and/or GGC repeats are related to cryptorchidism. Compared to controls, longer CAG/GGC repeats in the AR gene are seen in cryptorchidism. A role in determining bilateral cryptorchidism can be played by longer CAG repeats and in determining unilateral and bilateral cryptorchidism, a role can be played by longer GGC repeats. A greater applicability of these observations is noted in Caucasian populations.