(A) Oncomine output data was sorted to isolate specified associations as indicated and reported as the mRNA copy number unit expression values for normal breast, invasive ductal breast carcinoma, ER positive breast carcinoma, ER negative breast carcinoma, and triple negative breast carcinoma samples using box-and-whiskers plots (whiskers: 90/10 percentiles, box: 75/25 percentiles, line: median of all samples). (B) Kaplan-Meier plots of OS (left) and DMFS (right) of ER positive breast cancer patients with high or low expression of xCT. Data obtained from the Kaplan-Meier plotter database.