• Heinz-Josef Lenz, Fang-Shu Ou, Alan P Venook, Howard S Hochster, Donna Niedzwiecki, Richard M Goldberg, Robert J Mayer, Monica M Bertagnolli, Charles D Blanke, Tyler Zemla, Xueping Qu, Pratyaksha Wirapati, Sabine Tejpar, Federico Innocenti, and Omar Kabbarah.
• 1University of Southern California Norris Comprehensive Cancer Center, Los Angeles, CA.
• J. Clin. Oncol. 2019 Aug 1; 37 (22): 1876-1885.

PurposeTo determine the predictive and prognostic value of the consensus molecular subtypes (CMSs) of colorectal cancer (CRC) that represent a merging of gene expression-based features largely in primary tumors from six independent classification systems and provide a framework for capturing the intrinsic heterogeneity of CRC in patients enrolled in CALGB/SWOG 80405.Patients And MethodsCALGB/SWOG 80405 is a phase III trial that compared the addition of bevacizumab or cetuximab to infusional fluorouracil, leucovorin, and oxaliplatin or fluorouracil, leucovorin, and irinotecan as first-line treatment of advanced CRC. We characterized the CMS classification using a novel NanoString gene expression panel on primary CRCs from 581 patients enrolled in this study to assess the prognostic and predictive value of CMSs in these patients.ResultsThe CMSs are highly prognostic for overall survival (OS; P < .001) and progression-free survival (PFS; P < .001). Furthermore, CMSs were predictive for both OS (P for interaction < .001) and PFS (P for interaction = .0032). In the CMS1 cohort, patients treated with bevacizumab had a significantly longer OS than those treated with cetuximab (P < .001). In the CMS2 cohort, patients treated with cetuximab had a significantly longer OS than patients treated with bevacizumab (P = .0046).ConclusionThese findings highlight the possible clinical utility of CMSs and suggests that refinement of the CMS classification may provide a path toward identifying patients with metastatic CRC who are most likely to benefit from specific targeted therapy as part of the initial treatment.

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