Phase II study of mFOLFOX-4 followed by mFOLFIRI in advanced gastric cancer

Abstract

e15546 Background: FOLFOX followed by FOLFIRI regimen has been commonly used in colorectal cancer. This combination has also been evaluated in a number of phase II studies in the first- and second-line treatment setting of advanced gastric cancer. We have evaluated the efficacy and toxicity of modified FOLFOX-4 followed by modified FOLFIRI regimens in advanced gastric cancer patients. Methods: Previously untreated patients with advanced or recurrent gastric cancer were enrolled. As first-line therapy, patients received modified FOLFOX-4, bolus ldLV 50mg followed by a 5-FU bolus 400mg/m2 and 22-hour infusion 600mg/m2 on day 1 and 2, with oxaliplatin 85mg/m2 on day 1 every 14 days. At progression, patients received modified FOLFIRI, bolus ldLV 50mg followed by a 5-FU bolus 400mg/m2 and 22-hour infusion 600mg/m2 on day 1 and 2, with irinotecan 150mg/m2 on day 1 every 14 days as second-line therapy. Results: Fifty-six patients were enrolled in first-line mFOLFOX-4. Of these, 32 (57.1%) patients received sequential mFOLFIRI as second-line chemotherapy. In first- line therapy, mFOLFOX-4 achieved 41.4% (95% CI, 28–54%) partial response and 32.1% (95% CI, 20–45%) stable disease. The median time to progression was 4.2 months (95% CI, 2.8–5.5 months). In second-line therapy, mFOLFIRI achieved 18.8% (95% CI, 4–33%) partial response and 31.3% (95% CI, 14–48%) stable disease. The median time to progression was 3.1 months (95% CI, 1.4–4.7 months). Median survival was 12.8 months (95% CI, 9.5–16.0 months) in overall 56 patients, and median survival of sequential chemotherapy was 13.2 months (95% CI, 9.4–16.9 months) in 32 patients. In first-line mFOLFOX-4, NCI-CTC grade 3/4 hematological toxicities were neutropenia and thrombocytopenia in 28 (7.6%), 1 (0.3%) of the cycles, respectively and neutropenic fever was observed in 7 cycles (1.9%). Grade 1/2 sensory neuropathy was observed in three patients (5.6%). In second-line mFOLFIRI, NCI-CTC grade 3/4 hematological toxicity was neutropenia in 20 (19.8%) of the cycles, and neutropenic fever was observed in 5 cycles (4.6%). Grade 3 diarrhea was observed in one patient (3.1%). Conclusions: As sequential chemotherapy, the mFOLFOX-4 followed by mFOLFIRI regimen is both feasible and safe for advanced gastric cancer patients. No significant financial relationships to disclose.