CD274 and gastric cancer: The results showed that positive PD‐L1 expression was associated with a better OS after surgical resection in patients with early‐stage gastric cancers (HR = 0.44, 95%CI: 0.22–0.87; p = 0.019; Figure 7A), but HER2 amplification was not correlated with prognosis in these population (HR = 0.64, 95%CI: 0.26–1.57; p = 0.399; Figure 7B).