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Originally published as JCO Early Release 10.1200/JCO.2008.21.6663 on May 18 2009 © 2009 American Society of Clinical Oncology. Randomized Phase III Trial Comparing Biweekly Infusional Fluorouracil/Leucovorin Alone or With Irinotecan in the Adjuvant Treatment of Stage III Colon Cancer: PETACC-3From the Digestive Oncology Unit, University Hospital Gasthuisberg, Leuven; European Organisation for Research and Treatment of Cancer Headquarters, Statistics Department, Brussels, Belgium; Department of Oncology, Ospedali Riuniti, Bergamo; Medical Oncology, Catholic University of the Sacred Heart, Rome; Medical Oncology, Department of Pharmacology, Ospedale San Martino, Genova; Unit of Medical Oncology, Azienda Ospedaliero Universitaria Careggi; Medical Oncology, University of Florence, Florence, Italy; Szent László Hospital, Budapest, Hungary; Medical Oncology Service, Hospital Universitario Reina Sofia, Cordoba; Medical Oncology Department, Vall d'Hebron University Hospital, Barcelona, Spain; Hôpital Ambroise Paré, Centre Hospitalier Universitaire Paris Ouest, Boulogne; Service d'Hépato-Gastro-Entérologie and Service D'Oncologie Medicale, Groupe Hospitalier Pitié-Salpêtrière, Paris, France; St Luke's Cancer Centre, Royal Surrey County Hospital, Guildford; Royal Marsden Hospital National Health Service Foundation Trust, London and Surrey, United Kingdom; Third Medical Department with Hematology and Oncology, Private Medical University, Salzburg, Austria; Pfizer, New York, NY; Department of Haematology and Oncology, University Hospital Hamburg, Eppendorf, Germany; and Department of Surgery, Hôpital Cantonal Universitaire Genève, Genève, Switzerland. Corresponding author: Eric Van Cutsem, MD, PhD, Digestive Oncology Unit, University Hospital Gasthuisberg/Leuven, Herestraat 49, 3000 Leuven, Belgium; e-mail: Eric.VanCutsem{at}uz.kuleuven.ac.be. Purpose The primary objective of this randomized, multicenter, phase III trial was to investigate whether the addition of irinotecan to the de Gramont infusional fluorouracil (FU)/leucovorin (LV) adjuvant regimen (LV5FU2) would improve disease-free survival (DFS) in patients with stage III colon cancer. Patients and Methods After curatively intentioned surgery, patients with stage II and III colon cancer were randomly allocated surgery to receive LV5FU2 (LV 200 mg/m2 as a 2-hour infusion, followed by FU; as a 400 mg/m2 bolus and then a 600 mg/m2 continuous infusion over 22 hours, days 1 and 2, every 2 weeks for 12 cycles: de Gramont regimen) with or without irinotecan (180 mg/m2 as a 30- to 90-minute infusion, day 1, every 2 weeks). In total, 260 (7.9%) of 3,278 patients received an alternative high-dose infusional FU/LV regimen (Arbeitsgemeinschaft Internische Onkologie regimen) with or without irinotecan. Results The principal efficacy analysis was based on 2,094 treated patients with stage III disease, randomly allocated in the LV5FU2 strata. After a median follow-up of 66.3 months, the 5-year DFS rate was 56.7% with irinotecan/LV5FU2 and 54.3% with LV5FU2 alone (primary end point: log-rank P = .106). Combining irinotecan with LV5FU2 did not significantly improve overall survival in this patient group compared with LV5FU2 alone (5-year rate 73.6% v 71.3%, respectively; log-rank P = .094). The addition of irinotecan to LV5FU2 was associated with an increased incidence of grade 3 to 4 GI events and neutropenia. Conclusion Irinotecan added to LV5FU2 as adjuvant therapy did not confer a statistically significant improvement in DFS or overall survival in patients with stage III colon cancer compared with LV5FU2 alone. Authors' disclosures of potential conflicts of interest and author contributions are found at the end of this article. Clinical Trials repository link available JCO.org. Clinical trial information can be found for the following: NCT00026273 [ClinicalTrials.gov] .
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Copyright © 2009 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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