Journal of Clinical Oncology, Vol 19, Issue 20
(October), 2001: 4029-4036
© 2001 American Society for Clinical Oncology
T1-T2N0 Squamous Cell Carcinoma of the Glottic Larynx Treated With Radiation Therapy
By William M. Mendenhall,
Robert J. Amdur,
Christopher G. Morris,
Russell W. Hinerman
From the Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, FL.
Address correspondence to William M. Mendenhall, MD, Department of Radiation Oncology, PO Box 100385, Gainesville, FL 32610-0385; email: mendewil{at}shands.ufl.edu
PURPOSE: The end results after radiation therapy for T1-T2N0 glottic carcinoma vary considerably. We analyze patient-related and treatment-related parameters that may influence the likelihood of cure.
PATIENTS AND METHODS: Five hundred nineteen patients were treated with radiation therapy and had follow-up for 2 years. Three patients who were disease-free were lost to follow-up at 7 months, 21 months, and 10.5 years. No other patients were lost to follow-up.
RESULTS: Local control rates at 5 years after radiation therapy were as follows: T1A, 94%; T1B, 93%; T2A, 80%; and T2B, 72%. Multivariate analysis of local control revealed that the following parameters significantly influenced this end point: overall treatment time (P < .0001), T stage (P = .0003), and histologic differentiation (P = .013). Patients with poorly differentiated cancers fared less well than those with better differentiated lesions. Rates of local control with laryngeal preservation at 5 years were as follows: T1A and T1B, 95%; T2A, 82%; and T2B, 76%. Cause-specific survival rates at 5 years were as follows: T1A and T1B, 98%; T2A, 95%; and T2B, 90%. One patient with a T1N0 cancer and three patients with T2N0 lesions experienced severe late radiation complications.
CONCLUSION: Radiation therapy cures a high percentage of patients with T1-T2N0 glottic carcinomas and has a low rate of severe complications. The major treatment-related parameter that influences the likelihood of cure is overall treatment time.

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