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Meta-Analysis
. 2013;8(2):e55138.
doi: 10.1371/journal.pone.0055138. Epub 2013 Feb 1.

Allergies and risk of head and neck cancer: an original study plus meta-analysis

Jenn-Ren Hsiao  1 , Chun-Yen Ou, Hung-I Lo, Cheng-Chih Huang, Wei-Ting Lee, Jehn-Shyun Huang, Ken-Chung Chen, Tung-Yiu Wong, Sen-Tien Tsai, Chia-Jui Yen, Yuan-Hua Wu, Wei-Ting Hsueh, Ming-Wei Yang, Shang-Yin Wu, Jang-Yang Chang, Kwang-Yu Chang, Chen-Lin Lin, Fang-Ting Wang, Yi-Hui Wang, Ya-Ling Weng, Han-Chien Yang, Jeffrey S Chang
Affiliations
Meta-Analysis

Allergies and risk of head and neck cancer: an original study plus meta-analysis

Jenn-Ren Hsiao et al. PLoS One. 2013.

Abstract

Background: Although the relationship between allergy and cancer has been investigated extensively, the role of allergy in head and neck cancer (HNC) appears less consistent. It is not clear whether allergies can independently influence the risk of HNC in the presence of known strong environmental risk factors, including consumption of alcohol, betel quid, and cigarette.

Methods: THE CURRENT PAPER REPORTS RESULTS FROM: 1) an original hospital-based case-control study, which included 252 incident cases of HNC and 236 controls frequency-matched to cases on sex and age; and 2) a meta-analysis combining the results of the current case-control study and 13 previously published studies (9 cohort studies with 727,569 subjects and 550 HNC outcomes and 5 case-control studies with 4,017 HNC cases and 10,928 controls).

Results: In the original case-control study, we observed a strong inverse association between allergies and HNC [odds ratio = 0.41, 95% confidence interval (CI): 0.27-0.62]. The meta-analysis also indicated a statistically significant inverse association between HNC and allergies [meta-relative risk (RR) = 0.76, 95% CI: 0.63-0.91], particularly strong for allergic rhinitis (meta-RR = 0.55, 95% CI: 0.40-0.76). In addition, the inverse association between allergies and HNC was observed only among men (meta-RR = 0.67, 95% CI: 0.54-0.84) but not among women (meta-RR = 0.98, 95% CI: 0.81-1.18).

Conclusions: These findings suggest that immunity plays an influential role in the risk of HNC. Future studies investigating immune biomarkers, including cytokine profiles and genetic polymorphisms, are warranted to further delineate the relationship between allergies and HNC. Understanding the relationship between allergies and HNC may help devise effective strategies to reduce and treat HNC.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Process of article exclusion.
Figure 2
Figure 2. Meta-analysis assessing the association between allergies and head and neck cancer Risk.
Figure 3
Figure 3. Funnel plot of the 14 studies assessing the association between allergies and head and neck cancer risk.
See this image and copyright information in PMC

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