To further analyse DPP4 expression levels in normal and PCa tissues and examine correlations of DPP4 levels with progression and prognosis of PCa, we utilized TCGA‐PRAD dataset and observed no significant difference in DPP4 expression levels between tumour and noncancerous tissues (Figure 1A, left panel) or tumour and corresponding matched normal tissues (Figure 1A, right panel). This evidence concerns the gene DPP4 and posterior cortical atrophy.