 Saliva testing for specific mRNAs has been found to possess significant potential for oral cancer diagnosis.In fact, there is evidence to suggest that saliva RNA diagnostics are slightly superior to serum RNA diagnostics, with the comparative receiver operating characteristic (ROC) value being 95% for saliva but only 88% for serum.A 2009 study compared the saliva glucose levels of diabetic patients to those of non-diabetic controls.