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Letters | February 9, 2011

KRAS Genotypes and Outcome in Patients With Chemotherapy-Refractory Metastatic Colorectal Cancer Treated With Cetuximab

Kohei Shitara, MD; Tomoya Yokota, MD; Kei Muro, MD

JAMA. 2011;305(6):564-566. doi:10.1001/jama.2011.85.

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To the Editor: According to the retrospective analysis of KRAS genotypes and outcome after treatment with cetuximab in patients with chemotherapy-refractory metastatic colon cancer, Dr De Roock and colleagues reported that patients with KRAS codon p.G13D mutations who received cetuximab compared with best supportive care experienced longer progression-free and overall survival.¹ In contrast, patients with other KRAS mutations did not appear to benefit from cetuximab. Previously, any type of KRAS mutation indicated a lack of effect of anti-epidermal growth factor receptor monoclonal antibody therapy.¹

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February 9, 2011

KRAS Genotypes and Outcome in Patients With Chemotherapy-Refractory Metastatic Colorectal Cancer Treated With Cetuximab—Reply

Sabine Tejpar, MD, PhD; Wendy De Roock, MD, PhD; Derek Jonker, MD

JAMA. 2011;305(6):564-566. doi:10.1001/jama.2011.88.

February 9, 2011

KRAS Genotypes and Outcome in Patients With Chemotherapy-Refractory Metastatic Colorectal Cancer Treated With Cetuximab

Chen Mao, MD; Jin-Ling Tang, MD, PHD

JAMA. 2011;305(6):564-566. doi:10.1001/jama.2011.86.

February 9, 2011

KRAS Genotypes and Outcome in Patients With Chemotherapy-Refractory Metastatic Colorectal Cancer Treated With Cetuximab

Eeonora Zaccarelli, MD; Silverio Tomao, MD; Giovanni Codacci-Pisanelli, MD

JAMA. 2011;305(6):564-566. doi:10.1001/jama.2011.87.

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Shitara K, Yokota T, Muro K. KRAS Genotypes and Outcome in Patients With Chemotherapy-Refractory Metastatic Colorectal Cancer Treated With Cetuximab. JAMA. 2011;305(6):564-566. doi:10.1001/jama.2011.85.

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