KLRK1 and sarcoma: Briefly, we have observed that NK cells minimally infiltrated sarcomas and expression of DNAM-1 and NKG2D were very low in both peripheral and sarcoma-infiltrating NK cells (Figure 1), even though ligand expression was observed in freshly dissociated tumors (Figure 2) and the expression profiles of DNAM-1 and NKG2D ligands were associated with poor survival in sarcoma patients (Figure 6).