IFNG and chordoma: Our study showed that IFNγ increased PD-L1 expression (both % positive cells and MFI) on 2 of 2 chordoma cell lines (Fig. 6A) and in turn, enhanced the susceptibility of these cell lines to lysis by PD-L1 t-haNK cells (P ≤ 0.0001; Fig. 6B).