Mathivananet al also found a significant increase in the expression of CD63 and a decrease in the expression of CD9 and CD81 in exosomes present in the saliva of oral cancer patients compared to that of the exosomes in the saliva of healthy individuals.6 Exosomes are recognized by the molecular biomarkers that they express; namely, CD63, CD9, CD81, Alix, TSG101 and hsp70.15 Here, CD9 is linked to lip and oral cavity carcinoma.