PNPO and Miyoshi myopathy: After four weeks, we observed that the MM xenograft tumors formed by PNPO‐KD cells were visibly smaller than those formed by PNPO‐Ctrl cells (n = 5, p < 0.001) (Figures 1M,N; Figures S1G,H, Supporting Information), whereas the use of Dox had no significant effect on mouse weight (Figure S1I, Supporting Information).