SLC7A2 and neoplasm: Consequently, a risk score formula was constructed, “risk score = 0.2384 * SLC7A2 expression + 0.4544 * SLC7A3 expression − 0.3645 * SLC6A9 expression − 0.3365 * SLC25A15 expression.” Tumor samples had significantly higher risk scores than normal samples (Supplementary Figure S1).