Three-week hypofractionated radiotherapy in early glottic cancer-a single institution retrospective study

Abstract

Background: Radiotherapy is a standard treatment option for early glottic carcinoma (stage I and II) with a fraction size of 2-2.2 Gy over 5-7 weeks. This study evaluates the outcome and prognostic factors of a 3-week hypofractionated treatment in early glottic malignancy.

Materials and methods: The case records of 329 eligible patients with stage I and II glottic carcinoma recorded at the institution from 2003 to 2008 were retrospectively analysed. All patients were treated in a Cobalt-60 machine to a dose of 52.5 Gy in 15 fractions (3.5 Gy/fraction) over 3 weeks.

Results: Eighty-three percent had stage I disease. The local control rate at 5 years was 91.9%. On univariate analysis, stage I and II patients without subglottic extension had better local control. Disease extension to the subglottis fared poorly on multivariate analysis. After salvage treatment, the 5-year disease-free survival rate was 96.1% and the functional larynx preservation rate was 94.9% for stage I and 83.9% for stage II. The rate of severe complications was 2.1%.

Conclusion: Comparable results with low morbidity are achievable with a 3-week hypofractionation in early glottic cancers and it offers better patient convenience.

Highlights: In early glottic cancer, hypofractionated radiation provides excellent local control.Subglottic extension is a poor prognostic factor.5-year disease-free survival rate of 96.1%.5-year functional larynx preservation rate of 94.9%.Severe complication rate of 2.1%.

Keywords: glottic cancers; hypofractionation; radiotherapy.

Figure 1.. Kaplan–Meier curve showing difference in (a): local control with stage and (b): subglottic involvement.