Head and neck cancer staging systems: a comparison between UICC and AJC.

Two major TNM classification systems are currently in use for staging cancer of the head and neck region, i.e. UICC and AJC. This causes confusion when attempting to exchange information and evaluate treatment results between Australia and certain overseas centres. The two systems are described and the effect of any differences on altering survival data is assessed by reviewing 234 cases of squamous carcinoma of the larynx, hypopharynx, oropharynx and oral cavity. The direct correlation between the two systems is established. Shortcomings of the systems are demonstrated and important variables not included in either TNM system are discussed.