To examine whether phosphorylation of S537 influences the sensitivity of tumour cells to ferroptosis, RB1CC1‐KO HepG2 cells were reconstituted with RB1CC1S537A, RB1CC1S537E, RB1CC1RΔ5 and RB1CC1RΔ6. The gene discussed is RB1CC1; the disease is neoplasm.