KLK3 and posterior cortical atrophy: Given the clinical utility of the PSA gene in PCa testing, we studied the methylation of CpG and CCWGG (W = A/T) sites in the proximal promoter of PSA in both PSA-expressing and non-expressing cancer cell lines (LNCaP and PC3, respectively), as well as in noncancerous BPH1 and HPrEpiC cells.