Carcinoma

Hepatocellular carcinoma

Biology

Cancer research

Biochemistry

Internal medicine

MEDLINE

Oncology

Medicine

Nature Reviews Gastroenterology & Hepatology

Hepatocellular carcinoma (HCC), the most common form of primary liver cancer, typically develops on the background of chronic liver disease and is an aggressive disease with dismal prognosis. Studies using next-generation sequencing of multiple regions of the same tumour nodule suggest different patterns of HCC evolution and confirm the high molecular heterogeneity in a subset of patients. Different hypotheses have been proposed to explain tumour evolution, including clonal selection or neutral and punctuated acquisition of genetic alterations. In parallel, data indicate a fundamental contribution of nonmalignant cells of the tumour microenvironment to cancer clonal evolution. Delineating these dynamics is crucial to improve the treatment of patients with HCC, and particularly to help understand how HCC evolution drives resistance to systemic therapies. A number of new minimally invasive techniques, such as liquid biopsies, could help track cancer evolution in HCC. These tools might improve our understanding of how systemic therapies affect tumour clonal composition and could facilitate implementation of real-time molecular monitoring of patients with HCC. This Review discusses the molecular heterogeneity of hepatocellular carcinoma, the intrinsic and extrinsic factors that stimulate tumour evolution and how this information can be leveraged to improve the clinical management of patients with this disease.

Tumour evolution in hepatocellular carcinoma