Meta-analyses of the methylenetetrahydrofolate reductase C677T and A1298C polymorphisms and risk of head and neck and lung cancer

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• 作者：Stefania Boccia ; Paolo Boffetta ; Paul Brennan ; Gualtiero Ricciardi ; Francesco Gianfagna ; Keitaro Matsuo ; Cornelia M. van Duijn ; Rayjean J. Hung
• 关键词：Methylenetetrahydrofolate reductase (MTHFR) ; Lung cancer ; Head and neck cancer ; Genetic susceptibility ; Meta-analysis
• 刊名：Cancer Letters
• 出版年：2009
• 出版时间：8 January 2009
• 年：2009
• 卷：273
• 期：1
• 页码：55-61
• 全文大小：182 K

文摘

Authors report the results of four meta-analyses of studies that examined the association between methylenetetrahydrofolate reductase (MTHFR) C677T and A1298C polymorphisms and head and neck cancer (nine studies, 2076 cases and 4834 controls for C677T; four studies, 1439 cases and 3941 controls for A1298C), and lung cancer (ten studies, 5274 cases and 7435 controls for C677T; seven studies, 5098 cases and 6243 controls for A1298C). The summary odds ratio (OR) of head and neck cancer was 0.92 (95 % CI: 0.76–1.11) for MTHFR 677 TT and 0.68 (95 % CI: 0.37–1.26) for MTHFR 1298 CC. The OR of lung cancer was 1.22 [95 % confidence interval (CI): 0.95–1.55] for MTHFR 677 TT and 1.07 (95 % CI: 0.83–1.38) for MTHFR 1298 CC. Results from the meta-analysis of three studies on C677T stratified according to dietary folate intake showed an increased risk for individuals with low folate intake (OR = 1.37, 95 % CI: 0.92–2.06 for head and neck and OR = 1.28, 95 % CI: 0.97–1.68 for lung) versus high folate intake (OR = 0.85, 95 % CI: 0.63–1.16 for head and neck, and OR = 0.94, 95 % CI: 0.79–1.12 for lung). Despite the lack of formal statistical significance, these findings are consistent with the hypothesis that folate play a role in lung and head/neck carcinogenesis, and show the need to incorporate data on folate intake when interpreting results of MTHFR polymorphisms in relation to cancer risk.