CD274 and neoplasm: Treatment with anti‐PD‐L1 alone did not alter tumour volume or weight in HepG2, HepG2.2.15 or HepG2.2.15‐ BMP9 tumour‐bearing mice (Figure 6B, bottom panel; 6C, D blue icon); however, compared with treatment with anti‐PD‐L1 alone, the combination treatment with NK cells and anti‐PD‐L1 significantly reduced the tumour volume and weight (Figure 6B, bottom panel; 6C,D green icon) and resulted in greater number of infiltrating NK cells in HepG2 and especially HepG2.2.15‐BMP9 tumour‐bearing mice (Figure 6E, green icon, Supporting Information Figure S7B).