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Mechanistically, DDHD2 forms biomolecular condensates through phase separation upon AKT1-mediated phosphorylation, which enhances its lipase activity, reduces the abundance of proferroptotic lipids, and consequently decreases ferroptosis susceptibility. Therapeutically, the DDHD2 inhibitor KLH45 remarkably enhances ferroptosis sensitivity to restrict luminal breast cancer progression, and its combination with ferroptosis inducers further improves the efficacy of endocrine therapy. 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