Medline ® Abstracts for References 24,25
of 'Treatment for potentially resectable exocrine pancreatic cancer'
Adjuvant chemoradiation for pancreatic adenocarcinoma: the Johns Hopkins Hospital-Mayo Clinic collaborative study.
Hsu CC, Herman JM, Corsini MM, Winter JM, Callister MD, Haddock MG, Cameron JL, Pawlik TM, Schulick RD, Wolfgang CL, Laheru DA, Farnell MB, Swartz MJ, Gunderson LL, Miller RC
Ann Surg Oncol. 2010;17(4):981. Epub 2010 Jan 20.
BACKGROUND: Survival for pancreatic ductal adenocarcinoma is low, the role of adjuvant therapy remains controversial, and recent data suggest adjuvant chemoradiation (CRT) may decrease survival compared with surgery alone. Our goal was to examine efficacy of adjuvant CRT in resected pancreatic adenocarcinoma compared with surgery alone.
MATERIALS AND METHODS: Patients with pancreatic adenocarcinoma at Johns Hopkins Hospital (n = 794, 1993-2005) and Mayo Clinic (n = 478, 1985-2005) following resection who were observed (n = 509) or received adjuvant 5-FU based CRT (median dose 50.4 Gy; n = 583) were included. Cox survival and propensity score analyses assessed associations with overall survival. Matched-pair analysis by treatment group (1:1) based on institution, age, sex, tumor size/stage, differentiation, margin, and node positivity with N = 496 (n = 248 per treatment arm) was performed.
RESULTS: Median survival was 18.8 months. Overall survival (OS) was longer among recipients of CRT versus surgery alone (median survival 21.1 vs. 15.5 months, P<.001; 2- and 5-year OS 44.7 vs. 34.6%; 22.3 vs. 16.1%, P<.001). Compared with surgery alone, adjuvant CRT improved survival in propensity score analysis for all patients by 33% (P<.001), with improved survival when stratified by age, margin, node, and T-stage (RR = 0.57-0.75, P<.05). Matched-pair analysis demonstrated OS was longer with CRT (21.9 vs. 14.3 months median survival; 2- and 5-year OS 45.5 vs. 31.4%; 25.4 vs. 12.2%, P<.001).
CONCLUSIONS: Adjuvant CRT is associated with improved survival after pancreaticoduodenectomy. Adjuvant CRT was not associated with decreased survival in any risk group, even in propensity score and matched-pair analyses. Further studies evaluating adjuvant chemotherapy compared with adjuvant chemoradiation are needed to determine the most effective combination of systemic and local-regional therapy to achieve optimal survival results.
Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins Hospital, Baltimore, MD, USA.
Results and patterns of failure in patients treated with adjuvant combined chemoradiation therapy for resected pancreatic adenocarcinoma.
Hattangadi JA, Hong TS, Yeap BY, Mamon HJ
BACKGROUND: Although adjuvant chemoradiation is used commonly in the United States for the treatment of resected pancreatic cancer, there is no consensus on the benefit of this therapy, because the results from randomized trials are conflicting. The authors of this report reviewed their experience in a consecutive, unselected series of patients who received adjuvant 5-fluorouracil (5-FU) and radiation therapy (RT) for resected pancreatic adenocarcinoma.
METHODS: Eighty-six patients with resected pancreatic adenocarcinoma who received adjuvant therapy from 1998 to 2005 were identified, and their medical records were reviewed. Ninety-three percent of patients were treated with external beam RT to>or =50.4 grays, and 91% of patients received concurrent 5-FU by continuous infusion. Forty-five percent of patients went on to receive adjuvant gemcitabine.
RESULTS: The median follow-up was 31 months (range, 21-62 months) among the 20 patients who remained alive. Less than half of patients had positive (33%) or close (<1 mm; 15%) resection margins, 81% of tumors were classified as T3,and 66% of patients had involved lymph nodes. The median overall survival (OS) for all patients was 22 months. Negative lymph node status (P = .016) was a significant prognostic factor for improved OS, whereas treatment with gemcitabine trended toward improved OS (P = .080). The median disease-free survival (DFS) for all patients was 10 months: Treatment with gemcitabine (P = .044) and the receipt of any chemotherapy (P = .047) were significant predictors of DFS. Seventy-five patients (87%) had disease recurrence, and the majority recurred with peritoneal metastases (55%) or liver metastases (53%). Patients who had negative lymph nodes trended toward a lower rate of distant failure (P = .060).
CONCLUSIONS: The median survival of the current cohort was greater than that of the chemoradiation arms of European Organization for Research and Treatment of Cancer trials and European Study Group for Pancreatic Cancer 1 trials and was comparable to the survival observed on the Gastrointestinal Tumor Study Group chemoradiation arm. Lymph node status and treatment with adjuvant chemotherapy were significant predictors of OS and DFS, respectively. Future survival improvements should be directed at reducing peritoneal and liver metastases. Further randomized trials will be required to define the role of adjuvant therapy for pancreatic adenocarcinoma.
Department of Radiation Oncology, Brigham and Women's Hospital, Dana Farber Cancer Institute, Boston, MA, USA.