ROPN1 and benign prostatic hyperplasia: The quantitative analysis showed that the antibody titers of G antigen 1 (GAGE1), rhophilin associated tail protein 1 (ROPN1), sperm protein associated with the nucleus, X-linked, family member A1 (SPANXA1), and protein kinase C zeta (PRKCZ) in the serum samples from PCa patients were higher than those from BPH patients, and melanoma antigen family B1 (MAGEB1) and PRKCZ were found to be highly expressed.