Gemcitabine, oxaliplatin, and capecitabine (GEMOXEL) compared with gemcitabine alone in metastatic pancreatic cancer: a randomized phase II study

Background: Single-agent gemcitabine (GEM) has been considered for many years as the standard first-line treatment for advanced pancreatic cancer. However, recently, several studies reported encouraging activity and good tolerability for some combination regimens. Considering the apparently non-overlapping toxicity and the proved individual efficacy of GEM, oxaliplatin (l-OHP), and capecitabine (CAP), this randomized phase II study compared the activity and safety of the combination GEM, l-OHP, and CAP (GEMOXEL) versus GEM alone, in patients with metastatic pancreatic cancer. Materials and methods: The treatment in GEMOXEL arm consisted of GEM 1,000 mg/m2 as a 30-min intravenous infusion on days 1, 8, 15, 22, l-OHP 100 mg/m2 i.v. on day 2, and CAP 1,500 mg/m2/day in two divided doses on days 1-14, every 21 days (one cycle). In both treatment groups, GEM was administered weekly for seven consecutive weeks followed by 1-week rest for the first 8 weeks, and thereafter, GEM was continued on days 1, 8, 15, every 28 days. Chemotherapy was administered until disease progression or unacceptable toxicity. Results: Sixty-seven patients were enrolled in the study. Thirty-four were randomly assigned to GEMOXEL and 33 to GEM. At 4 months, disease control rate was 79.4 % with GEMOXEL versus 45.4 % with GEM (p = 0.004). The median progression-free survival was 6.8 months (95 % CI 5.3-7.3 months) in GEMOXEL arm and 3.7 months (95 % CI 2.9-4.7 months) in GEM arm (p < 0.001). The median OS was 11.9 months (95 % CI 10.6-12.9 months) in GEMOXEL arm and 7.1 months (95 % CI 5.5-9.1 months) in GEM arm (p < 0.001). Hematologic and non-hematologic toxicity was more severe with combination chemotherapy, yet still tolerable. No grade 4 adverse events were observed with either regimen. Conclusion: GEMOXEL regimen seemed to be safe and more efficient than the standard therapy with GEM alone in the treatment of metastatic pancreatic cancer.