observed higher levels of miR-4644 in plasma exosomes from patients with BC compared with patients without BC; additionally, exosomal miR-4644 directly targets and downregulates the expression of UBIAD1-containing protein 1 (UBIA prenyltransferase domain-containing protein 1) and promotes BC cell proliferation, migration and invasion [168]. The gene discussed is UBIAD1; the disease is breast cancer.