SLC7A5 and breast cancer: Positive SLC7A5 expression (>15 H-score) was observed in 191/1110 (17%) and 268/1554 (17%) of cases in the discovery and validation sets, respectively, while high SLC7A5 mRNA expression (log2 intensity >8) was observed in 1019/1923 (53%) of the METABRIC breast cancer cases.