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Originally published as JCO Early Release 10.1200/JCO.2008.17.3781 on September 15 2008 © 2008 American Society of Clinical Oncology. Adjuvant Chemotherapy After Potentially Curative Resection of Metastases From Colorectal Cancer: A Pooled Analysis of Two Randomized Trials
From the Hôpital Ambroise Paré, Assistance Publique Hôpitaux de Paris, Boulogne and EA4340, Faculty of Medicine, Paris-Ile de France Ouest, Université Versailles, Saint-Quentin; Centre Hospitalier Universitaire Purpan, Toulouse; Institut Gustave Roussy, Villejuif; Centre Hospitalier Universitaire Robert Debré, Reims; and Centre Hospitalier Universitaire Dijon and Fédération Francophone de Cancérologie Digestive, Dijon, France; University of Toronto, and Princess Margaret Hospital, Toronto; National Cancer Institute of Canada Clinical Trials Group, Queens University, Kingston, Ontario; and Alberta Cancer Board, Edmonton, Alberta, Canada; Institute Jules Bordet, Brussels; Universitair Ziekenhuis Gasthuisberg, Leuven, Belgium; Ospedali Riuniti, Bergamo; University of Padova, Padova; and Ospedale San Carlo Borromeo, Milano, Italy Corresponding author: Emmanuel Mitry, MD, PhD, Hépato-gastroentérologie et oncologie digestive, Hôpital Ambroise Paré, 9 ave Charles de Gaulle, 92100 Boulogne, France; e-mail: emmanuel.mitry{at}apr.aphp.fr Purpose Adjuvant systemic chemotherapy administered after surgical resection of colorectal cancer metastases may reduce the risk of recurrence and improve survival, but its benefit has never been demonstrated. Two phase III trials (Fédération Francophone de Cancérologie Digestive [FFCD] Trial 9002 and the European Organisation for Research and Treatment of Cancer/National Cancer Institute of Canada Clinical Trials Group/Gruppo Italiano di Valutazione Interventi in Oncologia [ENG] trial) used a similar design and showed a trend favoring adjuvant chemotherapy, but both had to close prematurely because of slow accrual, thus lacking the statistical power to demonstrate the predefined difference in survival. We report here a pooled analysis based on individual data from these two trials. Patients and Methods After complete resection of colorectal liver or lung metastases, patients were randomly assigned to chemotherapy (CT arm; fluorouracil [FU] 400 mg/m2 administered intravenously [IV] once daily plus DL-leucovorin 200 mg/m2 [FFCD] x 5 days or FU 370 mg/m2 plus L-leucovorin 100 mg/m2 IV x 5 days [ENG] for six cycles at 28-day intervals) or to surgery alone (S arm). Results A total of 278 patients (CT, n = 138; S, n = 140) were included in the pooled analysis. Median progression-free survival was 27.9 months in the CT arm as compared with 18.8 months in the S arm (hazard ratio = 1.32; 95% CI, 1.00 to 1.76; P = .058). Median overall survival was 62.2 months in the CT arm compared with 47.3 months in the S arm (hazard ratio = 1.32; 95% CI, 0.95 to 1.82; P = .095). Adjuvant chemotherapy was independently associated with both progression-free survival and overall survival in multivariable analysis. Conclusion This pooled analysis shows a marginal statistical significance in favor of adjuvant chemotherapy with an FU bolus–based regimen after complete resection of colorectal cancer metastases. published online ahead of print at www.jco.org on September 15, 2008. Supported by Association pour la Recherche en Oncologie Digestive. Presented in part at the 42nd Annual Meeting of the American Society of Clinical Oncology, June 2-6, 2006, Atlanta, GA. Authors disclosures of potential conflicts of interest and author contributions are found at the end of this article.
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Copyright © 2008 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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