Zhou Z, Peng Y, Wu X, Meng S, Yu W, Zhao J, Zhang H, Wang J, Li W. CCL18 secreted from M2 macrophages promotes migration and invasion via the PI3K/Akt pathway in gallbladder cancer. Cell Oncol (Dordr). 2019 Feb;42(1):81–92. doi: 10.1007/s13402-018-0410-8. PMID: 30276551.