Real-World Outcomes of FLOT versus CROSS Regimens for Patients with Oesophagogastric Cancers

INTRODUCTION: Treatment of oesophageal (OC), gastro-oesophageal junction (GOJ), and gastric cancer (GC) includes either neoadjuvant Chemoradiotherapy for Oesophageal Cancer Followed by Surgery Study (CROSS) for OC or GOJ or perioperative 5-fluorouracil, leucovorin, oxaliplatin, and docetaxel (FLOT) for OC, GOJ, and GC adenocarcinomas. This study aims to describe the real-world outcomes of patients with GC, GOJ, and OC treated with FLOT or CROSS and identify variables associated with efficacy through exploratory analysis. We also aimed to evaluate the comparison of FLOT and CROSS for the treatment of OC and GOJ adenocarcinomas. METHODS: This is a retrospective observational study of patients with locally advanced OC, GOJ, or GC treated with FLOT or CROSS between January 2015 and June 2021 in 5 cancer centres across Sydney, Australia. Long-rank test was used to compare survival estimated between subgroups. Hazard ratios for univariate and multivariate analyses were estimated with Cox proportional regression. RESULTS: The study included 168 patients. The 24-month relapse-free survival (RFS) and overall survival (OS) for FLOT were 59% and 69%, respectively. The median RFS was 29.6 months and median OS was not reached. For CROSS, the 24-month RFS and OS were 55% and 63% with a median RFS and OS of 28.5 and 40.2 months, respectively. There was no difference in OS and RFS between the treatments. FLOT was less tolerable than CROSS with more dose reductions, treatment discontinuation, and clinically relevant grade 3 and 4 toxicity. Neutrophil lymphocyte ratio was associated with survival for both treatments. CONCLUSION: Similar efficacy outcomes were seen in this real-world population compared to the clinical trials for FLOT and CROSS.