Notably, many peroxisome proliferators (i.e., PPARα activators) induce a so‐called tumor triad of liver adenomas/carcinomas (mice and rats), testicular Leydig cell tumors (rats) and pancreatic acinar cell tumors (rats) (Corton, Peters, & Klaunig, 2018; Felter et al., 2018; Klaunig et al., 2003). Here, PPARA is linked to testicular Leydig cell tumor.