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Review
. 2014 May 29:9:100.
doi: 10.1186/1746-1596-9-100.

The NQO1 Pro187Ser polymorphism and breast cancer susceptibility: evidence from an updated meta-analysis

Qiliu Peng, Yu Lu, Xianjun Lao, Zhiping Chen, Ruolin Li, Jingzhe Sui, Xue Qin  1 , Shan Li
Affiliations
Review

The NQO1 Pro187Ser polymorphism and breast cancer susceptibility: evidence from an updated meta-analysis

Qiliu Peng et al. Diagn Pathol. .

Abstract

Background nad(p)h: quinone oxidoreductase 1 (NQO1) plays a central role in catalyzing the two-electron reduction of quinoid compounds into hydroquinones. The NQO1 Pro187Ser polymorphism was found to correlate with a lower enzymatic activity, which may result in increased incidence of carcinomas including breast cancer. Previous studies investigating the association between NQO1 Pro187Ser polymorphism and breast cancer risk showed inconsistent results. We performed a meta-analysis to summarize the possible association.

Methods: All studies published from January 1966 to February 2014 on the association between NQO1 Pro187Ser polymorphism and breast cancer risk were identified by searching electronic databases PubMed, EMBASE, Cochrane library, and Chinese Biomedical Literature database (CBM). The association between NQO1 Pro187Ser polymorphism and breast cancer risk was assessed by odds ratios (ORs) together with their 95% confidence intervals (CIs).

Results: Ten studies with 2,773 cases and 4,076 controls were finally included in the meta-analysis. We did not observe a significant association between NQO1 Pro187Ser polymorphism and breast cancer risk when all studies were pooled into the meta-analysis. In subgroup analysis by ethnicity, significant increased breast cancer risk was found in Caucasians (Ser/Pro vs. Pro/Pro: OR=1.145, 95% CI=1.008-1.301, P=0.038; Ser/Ser+Ser/Pro vs. Pro/Pro: OR=1.177, 95% CI=1.041-1.331, P=0.009). When stratified by source of control, significant increased breast cancer risk was found in population-based studies (Ser/Pro vs. Pro/Pro: OR=1.180, 95% CI=1.035-1.344, P=0.013; Ser/Ser+Ser/Pro vs. Pro/Pro: OR=1.191, 95% CI=1.050-1.350, P=0.007). However, in subgroup analyses according to menopausal status, quality score, and HWE in controls, no any significant association was detected.

Conclusions: Our meta-analysis provides the evidence that the NQO1 Pro187Ser polymorphism contributed to the breast cancer susceptibility among Caucasians. Further large and well-designed studies are needed to confirm this association.

Virtual slides: The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/1248639991252504.

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Figures

Figure 1
Figure 1
Forest plots of the NQO1 Pro187Ser polymorphism and breast cancer risk in the overall populations. A. Forest plot for additive model Ser/Pro vs. Pro/Pro using a fixed-effect model; B. Forest plot for dominant model Ser/Ser + Ser/Pro vs. Pro/Pro using a fixed-effect model.
Figure 2
Figure 2
Forest plots of the NQO1 Pro187Ser polymorphism and breast cancer risk in population-based studies. A. Forest plot for additive model Ser/Pro vs. Pro/Pro using a fixed-effect model; B. Forest plot for dominant model Ser/Ser + Ser/Pro vs. Pro/Pro using a fixed-effect model.
Figure 3
Figure 3
Funnel plots for publication bias of NQO1 Pro187Ser polymorphism and breast cancer risk in the overall populations (dominant model Ser/Ser + Ser/Pro vs. Pro/Pro: P = 0.704).
See this image and copyright information in PMC

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