A matched pair analysis of oncological outcomes in human papillomavirus-negative oropharyngeal squamous cell carcinoma: Transoral surgery versus radiotherapy or concurrent chemoradiation.

Abstract

With the termination of RTOG 1221, there remains a lacuna regarding the optimal treatment for human papillomavirus (HPV)-negative oropharyngeal squamous cell carcinoma (OPSCC). Matched pair analysis with propensity score matching (PSM) between Arm I (transoral surgery [TOS] + risk-stratified adjuvant treatment) and Arm II (nonsurgical treatment - radiation/chemoradiation) in HPV(-) OPSCC. Unmatched comparison of Arm I (n=57) and Arm II (n=89) indicated significantly better overall survival (OS) and disease-free survival (DFS) for Arm I. PSM by matched pairs (n=48, 24 each arm) indicated 5-year OS at 80% and 72.1%, respectively, for Arm I and II (p > 0.05) and corresponding DFS at 65.3% and 33.4% (p > 0.05). Subgroup analysis did not demonstrate statistical difference in outcomes in stage II and III, but stage IV tumors had significantly better outcomes in Arm I than Arm II (4-year OS: 100% vs. 21%, p=0.04; DFS: 75% vs. 14.3%, p=0.04). TOS +/- adjuvant was found to have oncological outcomes at par with nonsurgical modalities in stage I-III OPSCC, whereas a distinct survival advantage was noted in case of stage IV tumors.