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Rev. invest. clín ; 58(5): 462-469, sep.-oct. 2006. tab
Article in Spanish | LILACS | ID: lil-632414

ABSTRACT

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.


Objetivo. Buscar la asociación entre polimorfismos de la enzima metilentetrahidrofolato reductasa (MTHFR), factores ambientales y cáncer cérvico-uterino (CaCU) en mujeres del noreste de México. Métodos. Setenta pacientes con CaCU y 89 mujeres controles se sometieron a un interrogatorio clínico y a genotipificación de los polimorfismos 677C -> T y 1298A -> C del gen MTHFR. Resultados. La multigestación (0-2 vs.> 3, OR 2.1), un temprano inicio de vida sexual (IVS) (17 < vs. > 18 años, OR 4.3) o la combinación de ambos factores (OR 3.5), estuvieron asociados significativamente al CaCU. Los polimorfismos de MTHFR 677, 1298 y sus combinaciones no fueron diferentes entre casos y controles. Sin embargo, se observó una interacción significativa entre las gestaciones, el IVS y los polimorfismos de MTHFR (presencia del alelo 1298C o del genotipo 677TT). El alelo 1298C combinado con multigestación, con un IVS < 17 años, o con ambos factores, incrementó el riesgo para CaCU en 4.3, 5.3 y 11.8 veces, respectivamente, en tanto que el genotipo 677TT modificó este riesgo a 2.0, 1.9, y 4.2 veces, respectivamente. Conclusión. El alelo 1298C incrementa considerablemente el riesgo para CaCU en mujeres multigestas y con un IVS temprano, en tanto que el genotipo 677TT disminuye este riesgo, pero sin llegar a convertirse en un factor protector.


Subject(s)
Adult , Aged , Female , Humans , Middle Aged , Pregnancy , Coitus , /genetics , Parity , Polymorphism, Genetic , Uterine Cervical Neoplasms/epidemiology , Uterine Cervical Neoplasms/genetics , Age Factors , Mexico
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