Diabetes Mellitus and Colorectal Cancer Risk Factors

Diabetes mellitus constitutes a major global health burden and, increasingly, evidence indicates that it is a significant risk factor for colorectal neoplasia. Population studies have consistently shown that individuals with type 2 diabetes have a higher incidence of colorectal adenomas and carcinoma than non-diabetic counterparts. Pathophysiological links centre on chronic hyperglycaemia, hyperinsulinaemia and metabolic dysregulation, which converge on pro-inflammatory pathways, oxidative stress and aberrant cellular signalling such as Wnt/β-catenin and PI3K/Akt/mTOR. Obesity, sedentary lifestyle, high-glycaemic diets and altered adipokine profiles further amplify risk. Moreover, antihyperglycaemic therapies exert differential effects: insulin secretagogues may exacerbate tumourigenesis, while metformin appears protective. Improved understanding of these mechanisms has practical applications in stratified screening, timely glycaemic control and development of targeted therapies addressing insulin/IGF-1 signalling. The global rise in prediabetes and early-onset diabetes underlines the urgency of integrating metabolic and oncological prevention strategies.

Research from Nature Portfolio

Recent studies have highlighted the timing and magnitude of glycaemic exposure on colorectal carcinogenesis. One analysis revealed that patients newly diagnosed with type 2 diabetes before the conventional screening age exhibit an elevated risk of proximal colorectal tumours, with younger men bearing a twofold increase compared with non-diabetic peers. This finding suggests reconsideration of screening thresholds in early-onset diabetes. A complementary meta-analysis established a linear dose–response relationship between fasting plasma glucose and colorectal cancer risk: for each 20 mg/dL increment in fasting glucose, relative risk increased by 1.015. These foundational works underscore blood glucose concentration as a continuous risk determinant and support tighter glycaemic targets to mitigate colorectal neoplasia.

Diabetes Mellitus and Colorectal Cancer Risk Factors publication trend

The graph below shows the total number of articles in diabetes mellitus and colorectal cancer risk factors across all publications each year (not limited to Nature Index journals).

Technical terms

Hyperglycaemia: Elevated blood glucose levels chronically associated with diabetes and implicated in tumour growth.

Hyperinsulinaemia: Sustained high insulin concentrations that may promote cellular proliferation through growth factor pathways.

Insulin-like growth factor 1 (IGF-1): A hormone related to insulin that stimulates mitogenic and anti-apoptotic signalling in colorectal cells.

MicroRNA (miRNA): Short non-coding RNAs that regulate gene expression and can modulate tumour behaviour.

References

1. Metabolic Alteration Bridging the Prediabetic State and Colorectal Cancer. Cells (2024).
2. 2017 update on the relationship between diabetes and colorectal cancer: epidemiology, potential molecular mechanisms and therapeutic implications. Oncotarget (2017).
3. Insulin-Like Growth Factor 1 (IGF-1) Signaling in Glucose Metabolism in Colorectal Cancer. International Journal of Molecular Sciences (2021).
4. The Activation of ERK1/2 and JNK MAPK Signaling by Insulin/IGF-1 Is Responsible for the Development of Colon Cancer with Type 2 Diabetes Mellitus. PLOS ONE (2016).
5. Higher risk of colorectal cancer in patients with newly diagnosed diabetes mellitus before the age of colorectal cancer screening initiation. Scientific Reports (2017).
6. High blood sugar levels significantly impact the prognosis of colorectal cancer patients through down-regulation of microRNA-16 by targeting Myb and VEGFR2. Oncotarget (2016).
7. A Linear Dose-Response Relationship between Fasting Plasma Glucose and Colorectal Cancer Risk: Systematic Review and Meta-analysis. Scientific Reports (2015).
8. Type 2 diabetes mellitus and risk of colorectal adenoma: a meta-analysis of observational studies. BMC Cancer (2016).
9. Diabetes and Colorectal Cancer Risk: Clinical and Therapeutic Implications. Journal of Diabetes Research (2022).
10. Prospective study of colorectal cancer risk and physical activity, diabetes, blood glucose and BMI: exploring the hyperinsulinaemia hypothesis. British Journal of Cancer (2001).