SPINK1 and neoplasm: A total of 103 samples from 20 PCa patients were analyzed; foci of adjacent non‐tumor prostate tissue, HGPIN, GL3, GL4, GL5, and LN were examined to determine the presence of the TMPRSS2‐ERG fusion and ERG, EZH2, NKX3.1, and SPINK‐1 expression levels, using RT‐PCR.