AR and posterior cortical atrophy: In addition, the AR transcription activity, correlated to the PCa risk, is implicated in polymorphism of CAG repeat length which has been demonstrated in vitro, and the AR with a shorter CAG repeats has greater transcription than that with longer CAG repeats.[70,71] Overall, the normal distribution of the CAG triad nucleotide repetitive sequences is reported in a range of 6 to 39, with an average of 19 to 20 in African–Americans, 21 to 22 in Caucasians, 22 to 23 in Asians, and 23 in Hispanics.[72] Remarkably, the length of CAG repeats was usually longer in Asians than in Caucasians.