T category of the international TNM classification of maxillary sinus carcinoma was proposed in 1987. This paper reviews the past classifications of the extent of maxillary sinus carcinoma.
The JJC proposal coincides with the UICC classification in 80% the cases. The differences between the two systems, however, are summarized as follows: 1) Erosion of the posterior bony wall is classified as T3 by the UICC but as T2 by the JJC, 2) Invasion to the posterior ethmoid sinuses is classified as T4 by the UICC but as T3 by the JJC, 3) Tumor visible on the hard palate, gingiva and/ or inferior nasal meatus is classified as T2 by the UICC but as T3 by the JJC, 4) Extension of the invasion beyond the midline of the hard palate and or ulceration of the skin is classified as T3 by the UICC but as T4 by the JJC.
Examination of our series of 845 primary cases suggests that the group with erosion of the posterior wall can be classified as T3 according to the UICC but the other groups should be classified by the JJC proposal.
The international classification was, however, useful considering that the 5-year survival rates for clinical stages I, II, III and IV were 69%, 46%, 31% and 19%, respectively.
