Giuliani M, et al. - Authors systematically reviewed the literature to ascertain 1. the malignant transformation rate (TR) of oral lichen planus (OLP) and its risk factors 2. if or not oral lichenoid lesions (OLL) have a different malignant transformation rate (TR). Review confirmed both OLP and OLL, the latter with a slightly higher TR, to be potentially malignant disorders and suggest that erosive type. Also female gender and tongue site should be considered as risk factors for OLP transformation.