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Review
. 2018 Sep 10;16(1):182.
doi: 10.1186/s12957-018-1485-4.

Assessment of thyroid cancer risk in more than 334,000 patients with inflammatory bowel disease: a case-control study and a meta-analysis

Lihong Cao  1
Affiliations
Review

Assessment of thyroid cancer risk in more than 334,000 patients with inflammatory bowel disease: a case-control study and a meta-analysis

Lihong Cao. World J Surg Oncol. .

Abstract

Background: Potential risk of thyroid cancer in patients with inflammatory bowel disease has not been well investigated. The aim of the study was to reveal the relationship between history of inflammatory bowel disease and risk of thyroid cancer.

Methods: First, 1392 patients with inflammatory bowel disease and 1392 controls were included in a case-control study. All patients did not receive immunosuppressive therapy. A multivariate logistic regression analysis was adopted to determine the relationship between history of inflammatory bowel disease and risk of thyroid cancer. Second, a literature search was performed and eight articles were collected. Pooled odds ratios with 95% confidence intervals were reported for relevant risk estimates in fixed or random effect model.

Results: In the case-control study, thyroid cancer was more common in patients with inflammatory bowel disease than in controls (P = 0.032). After Bonferroni correction, association of thyroid cancer risk with history of total inflammatory bowel disease or its two subtypes was not found. In the meta-analysis, patients with total inflammatory bowel disease or ulcerative colitis showed an increased risk of thyroid cancer, but patients with Crohn's disease did not. Furthermore, inflammatory bowel disease patients with immunosuppressive therapy showed an increased risk of the cancer, but patients without immunosuppressive therapy did not have this finding.

Conclusions: Risk of thyroid cancer probably elevates in patients with inflammatory bowel disease. Inflammatory bowel disease (particularly ulcerative colitis) itself and use of immunosuppressant might contribute to the development of the cancer.

Keywords: Crohn’s disease; Immunosuppressant; Inflammatory bowel diseases; Thyroid neoplasms; Ulcerative colitis.

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Conflict of interest statement

Ethics approval and consent to participate

All subjects signed the written informed consents and agreed to participate in this case control study. The study was separately approved by the ethics committee of Tianjin Medical University General Hospital and Tianjin Binjiang Hospital.

Consent for publication

Not applicable.

Competing interests

The author declares that she has no competing interests.

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Figures

Fig. 1
Fig. 1
Paper checklist and flowchart in the literature search
Fig. 2
Fig. 2
Relationship between history of inflammatory bowel disease and risk of thyroid cancer in fixed effects model
Fig. 3
Fig. 3
Funnel plots of studies evaluating publication bias in the meta-analysis
See this image and copyright information in PMC

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