[Policy Review] International consensus recommendations and alignment of terminology for the histopathological diagnosis of extranodal extension in head and neck squamous cell carcinoma: an HN-CLEAR initiative

Histopathologically detected extranodal extension leads to upstaging and treatment escalation in head and neck squamous cell carcinoma. There is considerable variation in the prevalence of histopathologically detected extranodal extension in comparable studies. The Head and Neck Cancer International Group, which includes 23 organisations managing patients with head and neck cancer, identified several challenges in evaluating histopathologically detected extranodal extension. Thus, the Head and Neck Consensus Language for Ease and Reproducibility (HN-CLEAR) and its global stakeholders prioritised developing diagnostic criteria and uniform terminology for histopathologically detected extranodal extension.