PTBP1 and posterior cortical atrophy: To investigate the functional link between PTBP1 and DNMT3B in contributing to radioresistance in PCa, we first examined the expression of different DNMT3B isoforms in a tissue set comprising 14 pairs of PCa tissues via PCR and found that the percentage‐splice‐in (PSI) was significantly higher in PCa tissues than that in paired adjacent noncancerous tissues (Figure S7a, Supporting Information).