16-covariate propensity score matching between trimodality (TMT)-eligible esophagogastric cancer (EC) patients who had surgery and those who declined surgery after preoperative chemoradiation.

111 Background: Localized EC patients should receive chemoradiation followed by surgery (TMT). Nevertheless, some patients decline surgery after preoperative chemoradiation. Reports on the outcome of such patients are scant. Methods: Between 2002 and 2011, we identified 622 TMT-eligible EC patients in our databases. Of 622 patients, 425 achieved clinical complete response (negative biopsy and PET in the physiologic range) after preoperative chemoradiation. Of 425, 244 patients underwent surgery but 61 patients declined surgery. We were able to matched 16 covariates between 36 patients who declined surgery and 36 patients who had TMT. Results: Baseline characteristics between the two groups were well-balanced (p=NS). Within this matched cohort, the median overall survival (OS) and relapse-free survival were 57.9 months (95% CI, 27.7-NA), and 18.5 (95% CI, 11.5-30.4) for the declined surgery group and those were 50.8 months (95% CI, 30.7-NA), and 26.5 months (95% CI, 15.5-NA) for the TMT group. OS and RFS f...