CD274 and gastric cancer: It has been suggested that hsa-miR-195-5p was involved in regulating the invasion and metastasis of gastric cancer cells by binding to PD-L1 and regulating E-calmodulin expression, which was closely associated with poor prognosis for patients with gastric cancer (Zou et al., 2019; Liu et al., 2020; Liu et al., 2021).