Study Investigates Colorectal Cancer Risk Factors

Overview of Colorectal Cancer

A recent study explores the connection between colorectal cancer risk and high blood glucose levels, insulin levels, and insulin resistance. Colorectal cancer, which includes tumors originating in the colon or rectum, ranks among the most frequently diagnosed cancers globally. There is a clear link between colorectal cancer and lifestyle-related health issues such as diabetes and obesity, making it crucial to investigate how these risk factors correlate with the onset of colorectal cancer.

Previous Research and Study Rationale

Existing evidence suggests that elevated blood glucose and insulin levels, typically associated with diabetes, may also influence colorectal cancer rates. However, many prior studies were retrospective, indicating a need for further cohort studies to validate these findings. A recent clinical research article published in BMC Cancer by a Swedish research group delves into this relationship.

Study Design and Participants

The study involved participants who underwent initial measurements in the 1990s and were monitored until they were diagnosed with colorectal cancer, died, migrated, or until the study concluded at the end of 2010. Researchers assessed blood glucose levels, insulin levels, and insulin resistance through blood tests. They also considered the participants’ sex and the specific site of cancer (colon or rectum) to determine whether these relationships varied by gender or cancer location. Out of 4,910 individuals in the study, 145 were diagnosed with colorectal cancer.

Key Findings

Notably, individuals who later developed colorectal cancer exhibited larger waists and higher insulin levels at the outset of the study in the 1990s. The authors found a significant association between elevated blood sugar levels and colorectal cancer, particularly in men, but not in women. Conversely, insulin levels and insulin resistance did not show a correlation with colorectal cancer incidence.

Implications of the Findings

The study indicates that high blood glucose levels are associated with an increased risk of colorectal cancer in men. With an extensive follow-up period allowing for the capture of numerous cancer cases, the findings align with other research highlighting similar associations. Preclinical studies have demonstrated that high glucose and insulin levels can lead to inflammation, a known factor in cancer development. Furthermore, the observation that this association occurs primarily in men may be attributed to hormonal differences between the sexes.

Conclusion

The evidence presented supports the link between high blood glucose levels and colorectal cancer risk, which could help identify patients who might benefit from targeted prevention and screening strategies for colorectal cancer.

Written by Branson Chen, BHSc

Reference: Vulcan A, Manjer J, Ohlsson B. High blood glucose levels are associated with higher risk of colon cancer in men: a cohort study. BMC Cancer. 2017 Dec;17(1):842.