SPINK1 and posterior cortical atrophy: Aiming to establish the clonal origin of the different prostatic foci analyzed in each of the 20 patients, the concordance of molecular characteristics was assessed with respect to the presence or absence of the TMPRSS2‐ERG fusion and the ERG, EZH2, NKX3.1, and SPINK‐1 gene expression in 70 prostatic foci (17 HGPIN and 53 PCa) (Figure 1, Table 3).