In line with the induction of CXCL8 across cancer cell lines, radiation consistently induced directional migration of CD56dim NK cells (PANC-1: 1.34-fold, P = 0.007; SK-MEL-28: 1.66-fold, P = 0.010; SJSA-1: 1.36-fold, P = 0.031) (Figure 4B) — a cell type expressing the cognate receptors CXCR1 and CXCR2 (8, 39). Here, CXCL8 is linked to cancer.