Glottic cancer: clinical factors affecting irradiation control

Area of Science:

• Oncology
• Radiotherapy
• Laryngology

Background:

• Glottic larynx cancer is a significant oncologic diagnosis.
• Orthovoltage radiotherapy was a primary treatment modality during the study period.
• Accurate staging is crucial for predicting treatment outcomes.

Purpose of the Study:

• To analyze the long-term outcomes of glottic larynx cancer treated with orthovoltage radiotherapy.
• To evaluate the recurrence-free survival rates based on tumor stage (T1, T2, T3).
• To identify prognostic factors influencing disease-free survival in T2 glottic cancer.

Main Methods:

• Retrospective analysis of 252 glottic larynx cancer patients treated between 1965 and 1971.
• Treatment modality: orthovoltage radiotherapy.
• Tumor staging: Union for International Cancer Control/American Joint Committee (UICC/AJC) staging system (1972).

Main Results:

• 3-year recurrence-free survival rates were 83% for T1, 62% for T2, and 60% for T3 glottic cancer.
• T2 patients with extraglottic extension or partial vocal cord mobility had a 70% disease-free survival.
• T2 patients with both extraglottic extension and partial immobility showed a reduced disease-free survival of 52%.

Conclusions:

• Orthovoltage radiotherapy provided varying recurrence-free survival rates for different stages of glottic cancer.
• Extraglottic extension and partial vocal cord immobility significantly impact disease-free survival in T2 glottic cancer.
• These findings underscore the importance of detailed staging for treatment planning and prognosis in glottic cancer.