Similarly, HCC-derived exosomal Anthrax toxin receptor 1 circ RNA (circANTXR1) promotes HCC proliferation and metastasis by up-regulating X-ray repair cross-complementing 5 (XRCC5) by acting as a sponge for miR-532-5p (106). Here, ANTXR1 is linked to hepatocellular carcinoma.