Phase II Study of Gemcitabine and Erlotinib as Adjuvant Therapy for Patients with Resected Pancreatic Cancer
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There is currently no consensus about the most effective adjuvant therapy for adenocarcinoma of the pancreas. Both gemcitabine and erlotinib have been demonstrated to improve survival in patients with metastatic disease. This study was designed to evaluate the efficacy of gemcitabine and erlotinib as adjuvant therapy, and to explore potential biomarkers associated with response.
An institutional review board–approved single-center phase II trial of adjuvant biweekly fixed-dose rate gemcitabine (1500 mg/m2) and daily erlotinib (150 mg/day) for 4 months followed by maintenance erlotinib (150 mg/day) over 8 months was initiated. Primary end point was recurrence-free survival (RFS). Epidermal growth factor receptor (EGFR) expression in the resected tumors was assessed by fluorescence in situ hybridization (FISH) and immunohistochemistry (IHC).
The study completed planned accrual of 25 patients. Median follow-up was 18.2 (range 11.6–23.5) months. Recurrences were observed in 17 subjects (68%). Median RFS was 14.0 months (95% confidence interval [95% CI], 8.2–24.5) with 1-year and 2-year RFS of 56% (95% CI, 35–73) and 26% (95% CI, 6–52), respectively. Median overall survival was not reached. Estimated 1-year and 2-year overall survival was 84% (95% CI, 63–94) and 53% (95% CI, 22–76), respectively. Nine patients (36%) had a grade 3 event and only 1 (4%) had a grade 4 (neutropenia). Most toxicities were dermatologic, gastrointestinal, and constitutional. There were nonsignificant trends to longer RFS and lower recurrence rates while receiving therapy in subjects with fluorescence in situ hybridization-positive tumors and greater immunohistochemistry expression.
Our phase II results suggest that adjuvant gemcitabine and erlotinib is a promising regimen that merits further investigation.
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- Phase II Study of Gemcitabine and Erlotinib as Adjuvant Therapy for Patients with Resected Pancreatic Cancer
Annals of Surgical Oncology
Volume 18, Issue 4 , pp 1122-1129
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- 1. Department of Surgery, Stony Brook University Hospital, Stony Brook, NY, USA
- 2. Virginia G. Piper Cancer Center, Scottsdale, AZ, USA
- 3. Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
- 4. Department of Medical Oncology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
- 5. Department of Surgery, Division of Surgical Oncology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA