Param, KarKanchan, MohodPuttewar, ManishKumar, Satish2020-05-052020-05-052018-07Param Kar, Kanchan Mohod, Puttewar Manish, Kumar Satish . Assessment Of Serum Paraoxonase-1 Enzyme Activity, Malondialdehyde And Vitamin-c In Oral Premalignancies. International Journal of Clinical and Biomedical Research. 2018 Jul; 4(3): 21-262395-04712521-0394http://imsear.searo.who.int/handle/123456789/200814Background:Oral premalignancies are a group of disease or syndromes which if left untreatedcanleadtocancer.ItcarriesagreatsignificanceinIndianperspective. Theactual figure of oral cancers arising from oral premalignancies is not known and to predict accuratelythemalignanttransformationsofthemisstillnotpossible.Oxidativestressisa known player behind cancerogenesis. Recently decreased Paraoxonase-1 activity and increasedoxidativestressmarkerswarefoundtobeassociatedwithOralSquamousCell Carcinoma. So, thereis astrongpossibilityofasimilar findingin Oral Premalignanciestoo. Aim: This studyaims to investigatethecor-relation between serum PON-1 activityand oxidative stress markers (MDA& Vitamin C) in patients with Oral Premalignancies. MaterialandMethods:Atotalof62patientswithclinically diagnosedoralpremalignant lesions anddiseasedcontrolswerechosenforthe study. Venous bloodsampleswerecollectedandPON-1,MDA (inse-rum)&Vitaminc (inplasma) wereanalysed spectro-photometrically. Results:A significant decreased serum PON-1 activity (P<0.05) and concomitant significantlyincreased serum MDA(P<0.05)anddecreased Vitamin Clevels (P<0.05) were observedinpremalignanciescomparedtothecontrols.Thesefinding weremorepronounced inOral Leukoplakia (OL) thaninOral Submucous Fibrosis (OSMF)withasignificantdifference.Meanlevelsoftheanalysedparameters differedaccordinglyin theclinicalgrades of oral premalignancies. Conclusion:Itcanbeenvis-agedthatserumPON-1activity andincreasedoxidativestress mightbe acontributingfactorbehindpathogenesisandprogressionofOralPremalignant DiseasesPremalignanciesCancerogenesisPON-1Journal ArticleIndiaDepartment of Biochemistry, Mahatma Gandhi Institute of Medical Sciences, Sevagram, Maharashtra, IndiaDepartment of ENT, Mahatma Gandhi Institute of Medical Sciences, Sevagram, Maharashtra, India