Interacciones entre polimorfismos del gen MTHFR, gestaciones e inicio de vida sexual modifican el riesgo para cáncer cérvico-uterino en una población del noreste de México

objective. to investigate the possible association among mthfr polymorfhisms, environmental factors and cervical cancer (cc) in the mexican population. methods. seventy patients with cc and 89 control women were questioned about clinical data and their 677 and 1298 genotypes of mthfr gene were analized. results. multipregnancies (0-2 vs. > 3, or 2.1), an early age of first intercourse (ivs) (17 < vs. > 18 years, or 4.3) or both factors (or 3.5) were significantly associated with cc. mthfr 677, 1298 polymorphisms and their combinations were not different between cases and controls. however, a significant association between pregnancies, tvs and mthfr polymorphisms (presence of 1298c allele or 677tt genotype) was observed. the 1298c allele plus multipregnancies and ivs < 17 years, or both factors, increased 4.3, 5.3, and 11.8 times the risk for cc, respectively, while 677tt genotype changed the risk 2.0, 1.9, and 4.2 times, respectively. conclusion. the 1298c allele increases the risk of cc strongly in women with multipregnancies and early age of ivs, while 677tt genotype has a lower risk without becoming a protection factor.