Prospects of accelerated fractionation chemoradiotherapy for locally advanced oropharyngeal cancer during the COVID-19 pandemic.

ABSTRACT

Objective. To comparatively assess the early toxicity of treatment, its tolerability, 1-, 2-, 3-year overall survival, and local regional control rates in a group of patients receiving a radical cycle of accelerated or conventional fractionation chemoradiotherapy. Subjects and methods. The paper presents the interim results of a prospective study that included 115 patients with locally advanced cancer of the oropharynx, tongue root, and larynx who received a radical cycle of conformal chemoradiotherapy using accelerated (the single focal dose (SFD) was 2.4 Gy for 25-26 fractions) or conventional (SFD was 2.0 Gy for 32-33 fractions) fractionation in the period from 2015 to 2020. Results. An analysis comparing the study group with the control one revealed no statistically significant differences in the level of early toxicity of treatment (p=0.41). Complete tumor reversal was achieved in 57 (86.3%) patients in the study group and in 39 (79.5%) in the comparison group (p=0.23). The 1-, 2-, and 3-year local regional control rates in the accelerated fractionation group was 78.3+/-5.3%;65.9+/-6.8%, and 54.5+/-9.2%, respectively. The 3-year overall survival rate was 80.4+/-7.4%. These rates did not differ statistically from those in the conventional radiotherapy group (p=0.12-0.82);53 (80.3%) patients in the study group and 37 (75.5%) in the standard fractionation group received a radiation cycle without a forced interval. The treatment interval in the patients of both groups reduced the 2-year local regional control rates by 30.2% compared to that in the continuous cycle group (p=0.02). Conclusion. Accelerated fractionation chemoradiotherapy (SFD was 2.4 Gy for 25-26 fractions, the daily focal dose was 60.0- 62.4 Gy) is a procedure comparable with conventional radiation in its direct efficiency and safety. During the COVID-19 pandemic, this regimen can be considered to be a mainstay for patients with locally advanced oropharyngeal cancer in order to preserve the previous volumes of specialized healthcare.Copyright © A.V. SEMENOV I.A. GULIDOV O.G. LEPILINA M.U. RADZHAPOVA F.E. SEVRYUKOV K.B. GORDON.