126013-144

CALGB/SWOG 80405: Phase III trial of irinotecan/5-FU/leucovorin (FOLFIRI) or oxaliplatin/5-FU/leucovorin (mFOLFOX6) with bevacizumab (BV) or cetuximab (CET) for patients (pts) with KRAS wild-type (wt) untreated metastatic adenocarcinoma of the colon or rectum (MCRC).

Subcategory: 
Category: 
Gastrointestinal (Colorectal) Cancer
Session Type and Session Title: 
Plenary Session, Plenary Session Including the Science of Oncology Award and Lecture
Abstract Number: 

LBA3

Citation: 

J Clin Oncol 32:5s, 2014 (suppl; abstr LBA3)

Author(s): 

Alan P. Venook, Donna Niedzwiecki, Heinz-Josef Lenz, Federico Innocenti, Michelle R. Mahoney, Bert H. O'Neil, James Edward Shaw, Blase N. Polite, Howard S. Hochster, James Norman Atkins, Richard M. Goldberg, Robert J. Mayer, Richard L. Schilsky, Monica M. Bertagnolli, Charles David Blanke, Cancer and Leukemia Group B (Alliance), SWOG, and ECOG; University of California, San Francisco, San Francisco, CA; Duke University, Durham, NC; USC Norris Comprehensive Cancer Center, Los Angeles, CA; The University of North Carolina at Chapel Hill, Chapel Hill, NC; Mayo Clinic, Rochester, MN; Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN; Virginia Commonwealth University, Richmond, VA; Pritzker School of Medicine, The University of Chicago, Chicago, IL; Department of Medical Oncology, Yale University School of Medicine, New Haven, CT; Southeast Cancer Control Consortium, CCOP, Goldsboro, NC; The Ohio State University Comprehensive Cancer Center - Arthur G. James Cancer Hospital and Richard J. Solove Research Institute, Columbus, OH; Dana-Farber Cancer Institute, Boston, MA; American Society of Clinical Oncology, Alexandria, VA; Brigham and Women's Hospital, Boston, MA; SWOG and Oregon Health & Science University, Portland, OR


Abstracts that were granted an exception in accordance with ASCO's Conflict of Interest Policy are designated with a caret symbol (^).

Abstract Disclosures

Abstract: 

Background: Irinotecan/5-FU/leucovorin (FOLFIRI) or oxaliplatin/5-FU/leucovorin (mFOLFOX6), combined with bevacizumab (BV) or cetuximab (CET), are first-line treatments for metastatic adenocarcinoma of the colon or rectum (MCRC). The optimal antibody combination is unknown. Methods: Patients (pts) with KRAS wild-type (wt)(codons 12 and 13) MCRC and performance status 0-1 received FOLFIRI or mFOLFOX6 (MD/pt choice at enrollment) and randomized to either CET 400 mg/m2 X 1, then 250 mg/m2 qw or BV 5 mg/kg q2w. The original study included unselected MCRC pts receiving FOLFIRI or mFOLFOX6 and randomized to CET, BV, or both. After 1,420 pts accrued the study amended as follows: only pts with KRAS wt tumors (codon 12 and 13) were included and the combination CET + BV arm was deleted. Rx continued until progression, death, unacceptable toxicity, curative surgery; treatment holidays of 4 wks permitted. Subsequent Rx not mandated. Accrual goal was 1,142 pts. One° endpoint was overall survival (OS). Results: Between November 2005 and March 2012, 3,058 unselected pts enrolled, 2,334 KRAS wt pts randomized; final N =1137 (333 pre-amend eligible retrospective KRAS test, 804 post-amend), median f/u = 24 mos; Median age – 59 y; 61% male. Chemo/BV – 559; chemo/CET – 578. FOLFIRI = 26.6%, mFOLFOX6 = 73.4%. OS analysis planned at 849 events; efficacy futility boundary crossed at 10th interim analysis on 1/29/14. OS - chemo/BV v. chemo/CET = 29.04 (25.66 - 31.21) v. 29.93 (27.56 - 31.21) mos; HR = 0.92 (0.78, 1.09) (p value = 0.34). PFS (by investigator): chemo/BV v. chemo/CET: 10.84 (9.86 - 11.4) v. 10.45 (9.66 - 11.33) mos. There were 94 pts free of disease following surgery, median f/u 40 mos (range 8.0 - 86.0). Outcomes similar by gender. On-study toxicity and deaths as expected. Analyses underway: Expanded RAS, FOLFOX v. FOLFIRI, subsequent therapies, long-term survivors, correlates. Conclusions: Chemo/CET and chemo/BV equivalent in OS in pts KRAS wt (codons 12 + 13) MCRC; either is appropriate in first line. Overall OS of 29 + mos and 8% long-term survivors confirms progress in MCRC. The preference for FOLFOX limits chemotherapy comparison. Expanded RAS and other molecular and clinical analyses may identify subsets of pts who get more or less benefit from specific regimens. Clinical trial information: NCT00265850.