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Published on: September 27, 2024
Racial differences in the incidence of colorectal cancer
Rukinder Virk1, Sharlene Gill, Eric Yoshida
1Leeds University Hospital, Leeds, United Kingdom.
Summary
Colorectal cancer incidence varies significantly across racial groups in British Columbia. South Asian Canadians show a lower incidence than Caucasian or Chinese Canadians, suggesting protective factors may influence cancer development.
Area of Science:
- Oncology
- Epidemiology
- Public Health
Background:
- Colon cancer is a leading cause of cancer mortality in Western societies.
- Population screening aims to reduce colorectal cancer (CRC) impact.
- Data on CRC incidence across diverse Canadian populations are limited.
Purpose of the Study:
- To determine the incidence of colorectal cancer in specific racial populations in British Columbia.
- To compare CRC rates among Caucasian, Chinese, and South Asian Canadians.
Main Methods:
- Retrospective analysis of the British Columbia Cancer Agency database (1994-1998).
- Utilized population census data to calculate age-specific and age-standardized incidence rates.
- Identified individuals of South Asian and Chinese descent using surname analysis.
Main Results:
- Age-standardized incidence rates for Caucasian Canadians ranged from 51.99 to 57.68 per 100,000.
- Rates for Chinese Canadians ranged from 39.2 to 31.2 per 100,000.
- Rates for South Asian Canadians ranged from 7.40 to 24.85 per 100,000.
- Significantly different relative risks (RR) were observed: C vs. CC (RR 1.9), C vs. SAC (RR 7.1), CC vs. SAC (RR 3.7).
Conclusions:
- First-time definition of significant colorectal cancer incidence differences across racial subgroups in British Columbia.
- Findings have implications for targeted screening strategies and understanding environmental influences on CRC.
- Lower CRC incidence in South Asian Canadians, despite high rates of heart disease and diabetes, suggests potential protective genetic or environmental factors.
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