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Correlation of ulcerative colitis and colorectal cancer: a systematic review and meta-analysis
Yansong Wang1, Pu Wang1, Lixiang Shao1
1Department of Oncology, The General Hospital of Western Theater Command, Chengdu, China.
Background:
A large number of studies have shown that ulcerative colitis (UC) can increase the risk of colorectal cancer (CRC). The purpose of the present study was to explore the specific mechanism of UC influence on CRC.
Methods:
We searched PubMed for articles related to CRC and colitis since the establishment of the database until April 2021. Keywords, such as ulcerative colitis, colorectal cancer, and relevance, were used for the article search. Two investigators read through the full text according to the inclusion and exclusion criteria to screen the articles. Cochrane system review manual (version 5.3) was adopted to evaluate the quality of the selected articles. Then, data was extracted, and the overall risk of UC patients into CRC, the course of the disease, and the region were systematically analyzed.
Results:
A total of 11 studies involving 26,765 patients with UC were included. The results showed that UC is one of the risk factors for CRC. we also found that geographical location also had an impact on the transition from UC to CRC, but the impact was not significant. Patients with colitis had a significantly higher rate of conversion to CRC after 10 to 20 years of disease.
Discussion:
A total of 11 articles were included to analyze the association between UC and CRC. The studies found that the location, duration, and geographical location of patients with UC directly affected the occurrence of CRC and are independent risk factors for the transformation of UC into CRC.
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