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Current Oncology is published by MDPI from Volume 28 Issue 1 (2021). Previous articles were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence, and they are hosted by MDPI on mdpi.com as a courtesy and upon agreement with Multimed Inc..
Article

The Risk of Colorectal Cancer Is Not Increased after a Diagnosis of Urothelial Cancer: A Population-Based Study

1
Univ Manitoba, Dept Internal Med, Hematol Oncol Sect, Winnipeg, MB, Canada
2
CancerCare Manitoba, Dept Med Oncol & Hematol, Winnipeg, MB, Canada
3
Univ Manitoba, Dept Internal Med, Gastroenterol Sect, Winnipeg, MB, Canada
4
Univ Manitoba, Community Hlth Sci, Winnipeg, MB, Canada
5
Canc Care Manitoba, Dept Epidemiol, Winnipeg, MB, Canada; [Nugent, Z.; Demers, A.] Canc Care Manitoba, Canc Registry, Winnipeg, MB, Canada
*
Author to whom correspondence should be addressed.
Curr. Oncol. 2016, 23(6), 391-397; https://doi.org/10.3747/co.23.3304
Received: 4 September 2016 / Revised: 3 October 2016 / Accepted: 2 November 2016 / Published: 1 December 2016
Background The data about whether patients with a prior urothelial cancer (UCa) are at increased risk of colorectal cancer (CRC) are conflicting. We used a competing risks analysis to determine the risk of CRC after UCa. Methods Historical cohorts were assembled by record linkage of Manitoba Cancer Registry and Manitoba Health databases. The incidence of CRC for individuals with UCa as their first cancer between 1987 and 2009 was compared with the incidence for randomly selected age- and sex-matched individuals without a cancer diagnosis at the index date (UCa diagnosis date). Three competing outcomes (CRC, another primary cancer, and death) were evaluated by competing risks proportional hazards models with adjustment for relevant confounders. Results The cohorts of 4591 patients with UCa and 22,312 without UCa were followed for a total of 179,287 person– years (py). After UCa, the rate of subsequent colon cancer in UCa patients was 4.5 per 1000 py compared with 3.6 per 1000 py in the non-cancer cohort. In the multivariable analysis, no overall increase in CRC risk was observed for patients first diagnosed with UCa (hazard ratio: 0.88; 95% confidence interval: 0.70 to 1.1; p = 0.26). Conclusions Because of similar CRC risk, a similar CRC screening strategy should be applied for individuals with and without UCa.
Keywords: Colorectal neoplasms; urinary bladder neoplasms; ureteric neoplasms; second primary neoplasms; survivorship; competing risks analyses Colorectal neoplasms; urinary bladder neoplasms; ureteric neoplasms; second primary neoplasms; survivorship; competing risks analyses
MDPI and ACS Style

Harlos, C.H.; Singh, H.; Nugent, Z.; Demers, A.; Mahmud, S.M.; Czaykowski, P.M. The Risk of Colorectal Cancer Is Not Increased after a Diagnosis of Urothelial Cancer: A Population-Based Study. Curr. Oncol. 2016, 23, 391-397. https://doi.org/10.3747/co.23.3304

AMA Style

Harlos CH, Singh H, Nugent Z, Demers A, Mahmud SM, Czaykowski PM. The Risk of Colorectal Cancer Is Not Increased after a Diagnosis of Urothelial Cancer: A Population-Based Study. Current Oncology. 2016; 23(6):391-397. https://doi.org/10.3747/co.23.3304

Chicago/Turabian Style

Harlos, C.H., H. Singh, Z. Nugent, A. Demers, S.M. Mahmud, and P.M. Czaykowski 2016. "The Risk of Colorectal Cancer Is Not Increased after a Diagnosis of Urothelial Cancer: A Population-Based Study" Current Oncology 23, no. 6: 391-397. https://doi.org/10.3747/co.23.3304

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