AXL and cancer: In another study, Li et al. found that the reduced expression of miR-34a-5p in CAF-derived exosomes promotes the proliferation and metastasis of OSCC by binding the downstream target of AXL; furthermore, the miR-34a-5p/AXL axis induces the epithelial–mesenchymal transition (EMT) process for cancer metastasis via the AKT/GSK-3β/β-catenin signal cascade [40] (Figure 2A).