NCOA4 and glioblastoma: demonstrated that in glioblastoma cells, cystine deprivation rather than L-buthionine sulfoximine treatment caused ferroptosis, although they both lead to depletion of cellular GSH, and NCOA4-mediated degradation of FTH1 was observed in cystine-deprived cells but not in L-buthionine sulfoximine -treated cells.