Chemoradiotherapy followed by surgery versus observation in esophageal squamous cell carcinoma.

PURPOSE We aimed to examine the effect of esophagectomy after chemoradiotherapy (CRT) or non-surgical follow-up after CRT in patients with locally advanced esophageal squamous cell carcinoma (ESCC). METHODS A total of 653 patients under follow-up for locally advanced ESCC between 2010-2019 were reviewed for enrollment. Patients with no distant metastasis at the time of diagnosis who underwent esophagectomy or were taken under observation following CRT were included in the study. Overall, 127 eligible patients were included, 55 of whom were male (43.3%) and 72 female (56.7%). RESULTS After CRT, 59 patients (53.5%) had undergone surgery and 68 (46.5%) were taken under observation. Median disease-free survival (mDFS) was not reached in the group that underwent surgery and was 13 months in the observation group (p<0.001). Median overall survival (mOS) was significantly longer in the operated group (p=0.006). There was no statistically significant difference in DFS and OS between patients who underwent surgery and those included in the observation group after achieving clinical and pathological complete response following CRT (p=0.119, p=0.699, respectively). The multivariate analysis identified surgery and increased CRT response as the factors that affect DFS (p=0.042, p<0.001, respectively). CONCLUSION In this study, surgery provided no additional benefit on survival in locally advanced ESCC patients with complete response while prolonged survival was observed in those without complete response. Key words: esophageal cancer, chemoradiotherapy, squamous cell carcinoma, observation .