TBX1 and oral lichen planus: In some populations, OLP has been reported to be associated with some systemic diseases such as dyslipidemia, hepatitis C, and thyroid disease (particularly hypothyroidism); which are called for further investigations.[5-6] There is a report about the higher levels of antinuclear antibody (ANA), antithyroglobulin (TGA), and antithyroid microsomal antibody in the population of patients with OLP.[7]