CXCR4 and colorectal cancer: Another study showed that colorectal cancer cells promoted the M2 pole of macrophages by transferring a set of miRNAs (miR-25-3p, miR-130b-3p, and miR-425-5p) through exosomes in response to stromal cell-derived factor 1/C-X-C chemokine receptor type 4 (CXCL12/CXCR4) activation through the PTEN/PI3K/Akt pathway, which enhanced the liver metastasis of colorectal cancer in vitro and in vivo [67].