Of the seven, CD84 (also known as SLAMF5, log2FC = − 3.69 and p = 2.22e−05 in total RNA-seq; log2FC = − 4.47 and p = 2.85e−10 in mRNA-seq), SLAMF7 (log2FC = − 3.12 and p = 4.44e−04 in total RNA-seq; log2FC = − 3.78 and p = 7.42e−08 in mRNA-seq) and CD244 (SLAMF4, log2FC = − 2.17 and p = 2.26e−02 in total RNA-seq; log2FC = − 2.34 and p = 1.16e−03 in mRNA-seq) were down-regulated in all T-PLL cases. Here, SLAMF7 is linked to T-cell prolymphocytic leukemia.