Squamous Cell Carcinoma of the Head and Neck in Ontario, Canada, and in Southeastern Norway

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Abstract
Objectives/Hypothesis Reports comparing case mix, treatments, and outcomes between different countries are uncommon in head and neck oncology. Prospective databases of unselected patients from regional cancer centers in southeastern Ontario, Canada, and southeastern Norway were compared.Study Design Retrospective comparative study of two prospective databases.Methods The case mix, treatments, and disease‐specific mortality were compared using frequency tables, Kaplan‐Meier survival curves, and the log rank test.Results The case mix, except for differences in oral cavity, oropharynx, and the recorded tumor (T) category, was similar, and the treatments were different. There was no statistical difference in overall survival for all patients, as well as for some sites.Conclusions The results of treatments, based on different overall treatment polices, for all patients were similar. The differences in recorded T category with no statistical difference in overall survival suggest a difference in staging assignment and raises a question about the reliability of the TNM staging process.