MUC1 and breast cancer: The results showed that Pink1 knockdown intensely constrained CCCP-induced cell proliferation and mammospheres formation not only in MDA-MB-468 cells (Figs. 6I, J, S6I), but also in BT549 cells (Fig. S6J, S6K), indicating MUC1 facilitates breast cancer progression by promoting Pink1-dependent mitophagy.