CD274 and glioblastoma: One explanation for this lack of efficacy of nivolumab could be the lack of immune T-cells within GBM in line with observed comparatively low normalised mean count values of PD-1 (MGMTuc = 7.43 [0.44] and MGMTmc = 8.08 [0.73]) and in keeping with overall comparatively low T-cell associated proteins in our cohort, compared with PD-L1 (MGMTuc = 11.50 ([0.57] and MGMTmc = 10.62 [0.58]).