Surveillance and outcomes after curative resection for gastroesophageal adenocarcinoma (GEAC).
e15579 Background: Although commonly performed, evidence supporting routine surveillance testing (SvT) in patients (pts) with resected GEAC is lacking. We evaluated patterns of relapse, frequency of salvage therapy and outcomes among pts with resected GEAC who underwent surveillance. Methods: Between 2011 and 2016, 210 consecutive pts with GEAC followed at Princess Margaret Cancer Center after resection were reviewed. SvT was any investigation performed in the absence of pt-reported symptoms, abnormal physical exam findings, or bloodwork. Relapse patterns were classified as locoregional (LRR; surgical anastomosis/gastroesophageal lumen/regional nodes) or distant (DR; beyond locoregional). Time-to-relapse (TTR) and overall survival (OS) were calculated from initial diagnosis, post recurrence survival (PRS) from initial relapse. Results: Median age was 64.1 years. Esophageal (14%), gastroesophageal junction (40%), and gastric adenocarcinomas (45%) were treated with surgery alone (29%), surgery plus perioperative chemotherapy (26%) or surgery plus chemoradiation (45%). SvT included imaging (71%), endoscopy (19%), tumor markers (6%), and clinical visits alone (9%). After median follow-up of 38.3 months (mo) (range 5.6-122.3), 3- and 5-year OS rates were 68% (95% confidence interval (CI) 62-75%) and 56% (95% CI 49-64%) respectively. Among 97 relapses (46%), 51 were detected by SvT, 45 by symptoms. Relapse patterns included LRR alone (4%), DR alone (86%) and both (10%). The majority of relapses (93%) occurred within 3 years. Pts with SvT-detected relapse had similar median TTR (16.2 vs 13.3 mo, p = 0.40) but longer PRS (16.5 vs 4.6 mo, p < 0.001) and OS (36.2 vs 23.7 mo, p = 0.004) than pts with symptomatic relapse. Salvage therapy in 4 pts (2%) resulted in post recurrence disease-free survival ≥2 years. Duration of palliative chemotherapy was similar between 28 pts with SvT-detected relapse and 18 pts with symptomatic relapses (3.9 vs 3.3 mo, p = 0.64). Conclusions: Following curative resection, 96% of relapses were distant. Routine SvT rarely enabled successful salvage therapy and did not extend duration of palliative chemotherapy. Longer OS in SvT-detected relapses was not due to earlier disease detection. These findings do not support routine SvT in pts with resected GEAC.