PRF1 and breast cancer: Consequently, CD8+ T-cell effector (Teff) score, comprising gene expression of IFNG, PRF1, CD8A and CD8B, and BATF3-DC score, calculated with the expression level of BATF3, IRF8, THBD, CLEC9A, and XCR118 were markedly increased in the high SLAMF6 group than in the low SL AMF6 group in breast cancer.