To further confirm the effect of PD‐L1 blockade on the proliferative ability of tumours, we added imatinib to GIST‐882 and PD‐L1+GIST882 cells, and the apoptosis rates of the two cell lines were not significantly different by flow cytometry, suggesting that the sensitivities of the two cell lines to imatinib were similar (Figure 3C). Here, CD274 is linked to neoplasm.