CXCL12 and cancer: Specifically, our results suggest that microRNA/mRNA interactions miR-27a/Foxo1, miR-27a/Mef2c, miR-27b/Cxcl12, miR-27b/Mef2c, miR-140/Cxcl12, miR-199a/Cav1, and miR-199a/Junb may contribute to muscle wasting in cancer cachexia.