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Ragasudha, Preethi N.; Thulaseedharan, Jissa V.; Wesley, Ramani; Jayaprakash, P. G.; Lalitha, Prema; Pillai, M. Radhakrishna
Nutrition and cancer, 05/2012, Letnik: 64, Številka: 4Journal Article
The present study was designed to identify the role of folate, B12, homocysteine, and polymorphisms of methylene tetrahydrofolatereductase (MTHFR) gene in cervical carcinogenesis among 322 women from Kerala, South India. Serum folate, vitamin B12 (chemiluminescence assay), and homocysteine (EIA) along with genetic polymorphisms of MTHFR gene (polymerase chain reaction/restriction fragment length polymorphism) were analyzed for 136 control subjects, 92 low-grade squamous intraepithelial lesions (LSIL) subjects, and 94 invasive cervical cancer cases (ICC). Statistically significant associations between MTHFR polymorphisms, serum homocysteine, and folate levels with cervical carcinogenesis were not evident, but we found that these parameters acted as effect modifiers of serum vitamin B12. The risk estimates observed for B12 became prominent only when there was a deficiency in serum folate levels LSIL-odds ratio (OR): 14.9 (95% CI: 2.65 to 84.4); ICC-OR = 8.72 (95% CI = 1.55 to 48.8) or when MTHFR A1298C polymorphic variant was present LSIL-OR = 9.8 (95% CI = 2.61 to 36.7); ICC-OR = 10.0 (95%CI = 2.5 to 39.3). The statistical significance of this effect modification was further studied using an interaction model, where only folate was observed to have an influence on B12 levels as suggested by the odds ratio of 7.11 (95% CI = 0.45 to 111.9) obtained for ICC group, implicating a synergistic role of these 2 vitamins in invasive cervical cancer.
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