KLRG1 and hepatocellular carcinoma: CD127−KLRG1+ and CD127+KLRG1− are respectively used to define short-lived effector cells (SLECs) and memory precursor cells (MPECs).26 27 To evaluate the state of CD137+CD8+ T cells from HCC, CD127 and KLRG1 surface expression were detected by flow cytometry.