Retinol dietary intake and oral leukoplakia development.

To investigate the clinical outcome of unbalanced diet in patients with oral precancerosis and to assess a possible relationship between dietary factors and the development of oral leukoplakia, a case-control study was carried out within a cohort of 53 subjects treated at our Centre in October-November 1997. Enrolled subjects and suitable controls underwent a careful interview on their own alimentary habits with a particular interest in retinol and carotenoids major sources. An individual qualitative and quantitative assessment of retinol-equivalents dietary intake, yielding average values for each group, allowed to compare the cohorts and to relate data also to tobacco use and to the severity of histopathological findings. Case levels were always significantly lower than controls (P<0.001), disregarding smoking, whilst no difference resulted between smokers and non smokers within the same groups. No statistical influence seemed to link alimentary vitamin A to the development of oral dysplasia but this work strengthen the epidemiological opinion that specific dietary factors are of great importance in oral oncology.