CCL20, also called liver and activation-regulated chemokine, macrophage inflammatory protein 3 alpha, and small-inducible cytokine A20, is highly expressed in many types of cancer, including NSCLC, ovarian cancer, colorectal cancer, penile cancer, breast cancer, gastric cancer, and pancreatic cancer (Han et al., 2015; Liu et al., 2016; Lee et al., 2017; Wang et al., 2019b; Liu et al., 2020a; Mo et al., 2020). Here, CCL20 is linked to gastric cancer.