RCN1 and posterior cortical atrophy: Following a comparison of protein expression frequency in PCa samples classified as LRPCa versus HRPCa, we observed that ITIH2 was present in all LRPCa (4 out of 4) but absent in HRPCa samples (p = 0.034), while RCN1 was exclusively expressed in HRPCa (6 out of 7) and not in LRPCa samples (p = 0.034).