Colorectal Cancer Epidemiology and Survival Analysis

Colorectal cancer remains one of the leading causes of cancer-related morbidity and mortality worldwide. Its epidemiology encompasses the study of incidence, geographic variation, temporal trends and the influence of demographic and lifestyle factors. Incidence rates are rising in many low- and middle-income regions, driven by urbanization, dietary westernization and ageing populations. Mortality patterns mirror incidence but are profoundly influenced by early detection through population screening and advances in treatment. Survival analysis, using methods such as Kaplan–Meier estimation and Cox proportional hazards modelling, quantifies time to event (often death or recurrence) and identifies prognostic factors. Key determinants of outcome include stage at diagnosis, histological subtype, molecular characteristics and access to health services. A global perspective highlights disparities in incidence and survival, underscoring the need for tailored prevention, screening and therapeutic strategies.

Research from Nature Portfolio

Recent studies have illuminated both social and molecular drivers of colorectal cancer progression. A large multilevel analysis in Brazil revealed that two-thirds of patients present with advanced-stage disease. Advanced stage at diagnosis was associated with extremes of age, lower regional Human Development Index and reduced density of primary care teams, emphasising the role of socioeconomic inequities in late presentation and poorer outcomes. Meanwhile, molecular profiling of tumours from West African patients has uncovered a distinct biological signature. Microsatellite instability rates were substantially higher than in reference cohorts, APC and WNT pathway alterations were less frequent and RAS pathway changes were more common. These findings underscore the necessity of region-specific data to guide diagnostic panels and targeted therapies, and they suggest that genetic and environmental context shapes tumour biology and survival prospects.

Colorectal Cancer Epidemiology and Survival Analysis publication trend

The graph below shows the total number of articles in colorectal cancer epidemiology and survival analysis across all publications each year (not limited to Nature Index journals).

Technical terms

Incidence rate: The number of new colorectal cancer cases in a defined population over a specified period, often expressed per 100 000 persons.

Age-standardised incidence rate: An incidence rate that has been adjusted to a standard age distribution to allow comparison between populations with different age structures.

Microsatellite instability: A molecular phenotype caused by defects in DNA mismatch repair, leading to accumulation of insertion/deletion mutations in repetitive genomic regions.

Human Development Index (HDI): A composite statistic of life expectancy, education and per capita income indicators used to rank regions by level of human development.

Survival analysis: A set of statistical methods for analysing time-to-event data, assessing overall survival or time to recurrence and identifying prognostic variables.

References

1. Multilevel analysis of social determinants of advanced stage colorectal cancer diagnosis. Scientific Reports (2024).
2. Molecular and phenotypic profiling of colorectal cancer patients in West Africa reveals biological insights. Nature Communications (2021).
3. Trends in the incidence of colorectal cancer in sub‐Saharan Africa: A population‐based registry study. International Journal of Cancer (2024).
4. Changing Colorectal Cancer Trends in Asians: Epidemiology and Risk Factors. Oncology Reviews (2023).