Document Type : Systematic Review and Meta-analysis
Authors
1
Clinical Research Development Unit of Imam Khomeini Hospital, Uremia University of Medical Sciences, Uremia, Iran.
2
Department of General Surgery, Babol University of Medical Sciences, Mazandaran, Iran.
3
Firoozgar Clinical Research Development Center (FCRDC), Firoozgar Hospital, Iran University of Medical Sciences, Tehran, Iran.
4
Department of Medical Genetics, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
5
Hasheminejad Kidney Center (HKC), Iran University of Medical Sciences, Tehran, Iran.
6
Department of Urology, Alborz University of Medical Sciences, Karaj, Iran.
7
Department of Medical Laboratory Sciences, School of Paramedical Science, Shiraz University of Medical Sciences, Shiraz, Iran.
8
Department of Medical Genetics, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
9
Mother and Newborn Health Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Abstract
The effects of the MTHFR rs1801133 (677C>T) and rs180113 (1298A>C) polymorphisms on bladder cancer risk have been evaluated in some studies. However, the results were conflicting and ambiguous. Therefore, we aimed to perform a comprehensive meta-analysis to investigate the association of these polymorphisms with risk of bladder cancer from all eligible case-control studies. PubMed, Web of science, Scopus, SID, CNKI and SciELO databases were searched to identify all relevant studies published up to 1 January, 2021. Odds ratios (ORs) and 95% confidence intervals (CIs) were used to estimate the strength of associations. A total of 20 case-control studies including 11 studies with 3463 cases and 3927 controls on MTHFR rs1801133 (677C>T) and 9 studies with 3177 cases and 3502 controls on rs180113 (1298A>C) polymorphism were selected. Pooled data revealed that the MTHFR rs1801133 (677C>T) and rs180113 (1298A>C) polymorphisms were not associated with risk bladder cancer in overall. Stratified analysis by ethnicity revealed that the MTHFR rs1801133 (677C>T) and rs180113 (1298A>C) polymorphisms were associated with bladder cancer risk in Asians, but not in Caucasians. There was no publication bias. The current meta-analysis revealed that the MTHFR rs1801133 (677C>T) and rs180113 (1298A>C) polymorphisms were not risk factor for development of bladder cancer globally. However, large sample size, well-designed, and population-based studies should be performed to verify the association of the MTHFR polymorphisms with bladder cancer risk.
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