Review links colorectal cancer origins to crypt position and tumour heterogeneity

The review describes how intestinal crypts maintain epithelial turnover through local stem-cell niches and morphogenetic gradients. It examines how a cell of origin at different positions along the crypt axis may initiate tumour development by outcompeting neighbouring stem cells or establishing a new stem-cell population, and how these routes differ in the mechanisms needed to escape local homeostatic control.

The authors discuss how these early processes influence clonal dynamics and give rise to morphologically distinct precursor lesions. They then consider how lesions progress into molecularly heterogeneous colorectal cancer subtypes with differing clinicopathological features and therapeutic outcomes. The review also highlights phenotypic plasticity as a contributor to tumour-cell adaptation, treatment resistance and metastasis.

This is a narrative review, not a clinical study, and the supplied text reports no patient sample size or new outcome data. Its account offers a framework for understanding colorectal cancer heterogeneity, but does not establish a diagnostic or treatment strategy for clinical use.