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Drug-tolerant persister (DTP) cancer cells drive residual tumor and relapse. However, the mechanisms underlying DTP state development are largely unexplored. In a recent study, we determined that PINK1-mediated mitophagy favors DTP generation in the context of MAPK inhibition therapy. DTP cells that persist in the presence of a MAPK inhibitor exhibit mitochondriadependent metabolism. During DTP state development, MYC depletion alleviates the transcriptional repression of  PINK1 , resulting in PINK1 upregulation and mitophagy activation. PINK1-mediated mitophagy is essential for mitochondrial homeostasis in DTP cells. Either knockdown of PINK1 or inhibition of mitophagy eradicates DTP cells and achieves complete responses to MAPK inhibition therapy. This study reveals a novel role of mitophagy as a protective mechanism for DTP development.

Mitophagy is a novel protective mechanism for drug-tolerant persister (DTP) cancer cells