Efficacy and Safety of mFOLFOX-6 in Advanced Gastric Cancer: A Prospective Observational Study

The widespread use of oxaliplatin plus infusional 5-fluorouracil (5-FU) and folinic acid (FOLFOX) in advanced gastric cancers is mainly based on clinical trials conducted at Western/European countries. The prospective data on efficacy and safety of FOLFOX in advanced gastric cancer is lacking from the developing countries. In this prospective observational study, we evaluated the efficacy and toxicity of mFOLFOX-6 in patients with advanced gastric or gastroesophageal junction (GEJ) adenocarcinomas, as first-line palliative chemotherapy.

Patients with previously untreated metastatic adenocarcinoma of stomach/GEJ, received mFOLFOX-6 (2 hours infusion of oxaliplatin [85 mg/m ² ] and folinic acid [400 mg/m ² ], followed by fluorouracil 400 mg/m ² intravenous push, then a 46-hour continuous infusion of 5-FU [2,400 mg/m ² ]). Cycles were repeated every 2 weeks. The patients were prospectively followed up for response rates and toxicity.

Sixty-six patients were included in the study with a median age of 57 years. Sixty-two patients were evaluable for response. The overall response rate was 53%, with a disease control rate (overall response and stable disease) of 81.8%. The median progression-free survival was 6 months (95% confidence interval [CI] 5.2-6.7 months) and the median overall survival was 11.5 months (95% CI 9.0-13.9 months). Ascites at presentation and more than one site of metastasis are associated with significantly lower survival on the log-rank test. Gastrointestinal and hematological toxicities were predominant, with rates of grade 3 to 4 nausea/vomiting (13.6%), anemia (15.1%), and neutropenia (13.6%). Among other toxicities, neurosensory toxicities were common. Four (6%) patients had grade 3 peripheral neuropathy.

mFOLFOX-6 is an active and well-tolerated chemotherapy regimen in advanced adenocarcinoma of stomach/GEJ. This regimen has similar response rates and treatment outcomes with lesser grade 3 or 4 toxicities than that of triplet regimens compared to historical studies.