CD79A and oral lichen planus: Out of five studies reporting the serum IgA and IgG levels [15,16,17,19,20], only one [17] reported a significant difference for IgA level (a lowered level), while three studies [15,16,19] reported a significant difference for IgG level (an elevated level in two studies and a lowered level in the other) in OLP patients as compared to the healthy controls.