Trends in Investigations for Suspected Head and Neck Carcinoma of the Unknown Primary: A HNCIG and IFHNOS International Survey of Practice.

Background: The aim of this clinical survey was to assess variations in head and neck squamous cell carcinoma from an unknown primary (HNSCCUP) diagnostic practices across international centers.

Methods: Clinical practice survey of experts nominated by Head and Neck Cancer International Group (HNCIG) and International Federation of Head and Neck Oncologic Societies (IFHNOS).

Results: Responses were received from 48/49 (97.