MEN1 and posterior cortical atrophy: We did not observe a linear correlation between HSP27 and Menin levels in serum of patients with non-aggressive PCa (r = −0.108; R = 0.011; p = 0.677); contrariwise, there was a significant inverse correlation between HSP27 and Menin in serum of patients with moderately aggressive PCa (r = −0.497; R = 0.247; p = 0.025).