CYP1A1 m1 Polymorphism Increase Risk for Cervical Cancer in Oral Contraceptive Users

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Mayuree Wongpratate
Wannapa Settheetham Ishida
Sophida Phuthong
Sitakan Natphopsuk


Background and Objectives:  HPV infection is the main cause for cervical cancer. However, contraceptive use and genetic background may raise a risk of developing cervical cancer. CYP1A1 plays an important role in carcinogenic detoxification. Therefore, genetic polymorphism in CYP1A1 may affect role of CYP1A1 leading to difference in susceptibility to cancer. The aim of this study was to investigate the association between CYP1A1 m1 polymorphism combined with oral contraceptives and cervical cancer risk in Northeastern Thai women.

Methods:  The case-control study of women volunteers were divided into 2 groups, cervical cancer group (n=204) and healthy control group (n=204). DNA was extracted from white blood cells. CYP1A1 m1 polymorphism was detected by PCR-RFLP. Association between CYP1A1 m1 polymorphism combined with oral contraceptive use and cervical cancer risk was examined by uni-, multivariate logistic regression.

Results:  Carriers of CC genotype of CYP1A1 m1 had 10-fold increased cervical cancer risk among women who take oral contraceptives for 5-10 years (95% CI=0.66-530.47, p=0.0455). 

Conclusions:  Our result suggests that CYP1A1 m1 polymorphism is associated with increased risk of cervical cancer in women who use oral contraceptives for long term.


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