Prognostic factors in T2 glottic cancer

Area of Science:

• Otolaryngology
• Oncology
• Radiation Oncology

Background:

• Glottic cancer staging impacts treatment decisions and prognosis.
• Current T2N0M0 staging for glottic cancer may not fully capture prognostic differences.
• Vocal cord mobility is a key clinical indicator in glottic cancer assessment.

Purpose of the Study:

• To evaluate the impact of vocal cord mobility and tumor extension on outcomes in T2N0M0 glottic cancer treated with radiotherapy.
• To determine if current T2 staging accurately reflects prognosis.
• To propose a refined staging system for T2 glottic cancer.

Main Methods:

• Retrospective analysis of 154 T2N0M0 glottic cancer patients treated with radiotherapy from 1965-1974.
• Assessment of outcomes based on vocal cord mobility and tumor surface extension.
• Analysis of actuarial local recurrence-free rates and corrected actuarial survival.

Main Results:

• Impaired vocal cord mobility was associated with a significantly lower local control rate (51.1% vs. 76.7%, P=0.015).
• A trend towards lower corrected actuarial survival was observed in patients with impaired vocal cord mobility (75.2% vs. 86.8%, P=0.068).
• Tumor surface extension did not significantly impact survival or local control rates after accounting for vocal cord mobility.

Conclusions:

• Vocal cord mobility is a critical prognostic factor in T2N0M0 glottic cancer treated with radiotherapy.
• The current T2 stage for glottic cancer should be subdivided into T2a (normal vocal cord mobility) and T2b (impaired vocal cord mobility).
• This proposed subdivision may lead to more accurate prognostic assessment and tailored treatment strategies.