Baseline carcinoembryonic antigen (CEA) serum levels predict bevacizumab-based treatment response in metastatic colorectal cancer.
Carcinoembryonic antigen (CEA) affects tumorigenesis by enhancing tumor cell survival and by inducing tumor angiogenesis. This study aimed to evaluate baseline CEA serum levels to predict bevacizumab-based therapy effect and survival in patients with metastatic colorectal cancer (mCRC). Two hundred and ninety eight mCRC patients receiving chemotherapy plus either bevacizumab or cetuximab were analyzed in a retrospective study. Disease control (DC), progression-free survival (PFS), and overall survival were assessed and related to pretreatment CEA serum levels. Patients with baseline CEA serum levels below the statistical median of 26.8 ng/mL (group I) were compared with patients with higher CEA levels (group II). The cetuximab-based treatment cohort was analyzed for specificity assessment of CEA to predict the anti-vascular endothelial growth factor effect in mCRC. Baseline CEA serum levels inversely correlated with therapeutic response in patients receiving bevacizumab-based treatment (disease control rate, 84% vs 60%), inversely correlated with median PFS leading to a median PFS benefit of 2.1 months for patients in group I when compared with group II, as well as inversely correlated with median overall survival (37.5 months vs 21.4 months). In an independent cohort of 129 patients treated with cetuximab-based therapy, no association of therapeutic response or PFS with CEA serum levels was found. As expected, baseline CEA levels were prognostic for mCRC. These data give first evidence that baseline serum CEA levels might constitute an important predictor for the efficacy of first-line bevacizumab-based therapy in patients with mCRC.
['Prager|Gerald W|GW|', 'Braemswig|Kira H|KH|', 'Martel|Alexandra|A|', 'Unseld|Matthias|M|', 'Heinze|Georg|G|', 'Brodowicz|Thomas|T|', 'Scheithauer|Werner|W|', 'Kornek|Gabriela|G|', 'Zielinski|Christoph C|CC|']
D000368:Aged D061067:Antibodies, Monoclonal, Humanized D000971:Antineoplastic Combined Chemotherapy Protocols D000068258:Bevacizumab D014408:Biomarkers, Tumor D002272:Carcinoembryonic Antigen D015179:Colorectal Neoplasms D018572:Disease-Free Survival D005260:Female D006801:Humans D053208:Kaplan-Meier Estimate D008297:Male D008875:Middle Aged D012189:Retrospective Studies D016896:Treatment Outcome
carcinoembryonic antigen colorectal cancer bevacizumab Angiogenesis inhibitors biological markers