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Preoperative Paclitaxel and Concurrent Rapid-Fractionation Radiation for Resectable Pancreatic Adenocarcinoma: Toxicities, Histologic Response Rates, and Event-Free Outcome

From the Pancreatic Tumor Study Group, University of Texas M.D. Anderson Cancer Center, Houston, TX.

Address reprint requests to Peter W.T. Pisters, MD, Department of Surgical Oncology, Box 444, University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Blvd, Houston, TX 77030-4009; email: ppisters{at}mdanderson.org

PURPOSE: To evaluate the toxicity of a preoperative regimen of paclitaxel and concurrent external-beam radiation therapy, pancreaticoduodenectomy, and electron-beam intraoperative radiation therapy (EB-IORT) for patients with resectable pancreatic adenocarcinoma.

PATIENTS AND METHODS: Patients with localized, potentially resectable pancreatic adenocarcinoma were treated with 30 Gy external-beam radiation therapy and concomitant weekly 3-hour infusions of paclitaxel (60 mg/m²). Radiographic restaging was performed 4 to 6 weeks after chemoradiation, and patients with localized disease underwent pancreatectomy with EB-IORT.

RESULTS: Thirty-five patients completed chemoradiation; 16 (46%) experienced grade 3 toxicity. Four patients (11%) required hospitalization for dehydration due to grade 3 nausea and vomiting. Twenty (80%) of 25 patients who underwent surgery underwent pancreatectomy; EB-IORT was used in 13 patients. There were no histologic complete responses to preoperative therapy; 21% of specimens demonstrated more than 50% nonviable cells (grade 2b treatment effect). With a median follow-up period of 46 months, the 3-year overall survival rate with chemoradiation and pancreatectomy was 28%.

CONCLUSION: Preoperative paclitaxel-based concurrent chemoradiation is feasible. The toxicity of this regimen seems greater than that with fluorouracil. The histologic responses and survival are similar, suggesting no advantages to paclitaxel-based preoperative treatment.

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