MTTP and triple-negative breast carcinoma: Their exosomal microsomal triglyceride transfer protein (MTTP) upregulates GPX4 and XCT to inhibit ferroptosis in colorectal cancer (Zhang 2022), while adipocyte-secreted oleic acid attenuates lipid peroxidation and ferroptosis in triple-negative breast cancer cells in an ACSL3-dependent manner (Xie 2022).