Cancer of the piriform sinus: treatment by radiation therapy alone and with surgery.

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Abstract
To ascertain the optimal treatment for carcinoma of the piriform sinus, the authors determined survival rates and local and regional tumor growth for two groups of patients: those treated by radiation therapy alone (n = 209) and those treated by radiation therapy combined with surgery (n = 154). The two groups were similar with respect to the characteristics of primary tumor stage and degree of nodal involvement. The overall 3-year and 5-year actuarial survival rates were 19.2% and 15.5%, respectively. For 5-year actuarial survival, there was no significant difference between patients with T1 and T2 tumors, but there was a significant difference between patients with T1 + T2 tumors versus those with T3 tumor. There was no significant difference in 3- and 5-year survival between patients with N0 and N1 nodal involvement and those with N1 and N2 involvement, but there was a significant difference between patients with N0 versus those with N3 involvement. The 5-year actuarial survival rate is significantly better for patients who underwent surgery followed by radiation therapy than for those who received only radiation therapy. However, for patients with early-stage (T1 and T2) tumors, radiation therapy alone controls local tumor growth as well as the combination of surgery and radiation therapy does. For each treatment group, the cause of death and patterns of failure were studied and compared with investigations to date.