CXCL13 and colorectal carcinoma: To further understand the effects of exosomal miR-934 on the microenvironment surrounding liver metastases, human Kupffer cells (Life Technologies) were also treated with CRC-derived exosomes, and ELISA showed that exosomal miR-934 could significantly increase CXCL13 secretion by Kupffer cells (Additional file 10: Fig. S10).