Panitumumab has a high affinity for epidermal growth factor receptor. Its utility as a salvage therapy is unknown in cetuximab-resistant colorectal cancer. We assessed the prognostic and predictive role of circulating tumor cells (CTCs) in KRAS wild-type metastatic Colorectal Cancer (mCRC) patients treated with panitumumab after progression on cetuximab.Citation: Ohhara Y, Matsusaka S, Watanabe T, Shinozaki E, Suenaga M, et al. (2013) Circulating Tumor Cells as Prognostic Marker in Japanese patients with Kras Wild-type Metastatic Colorectal Cancer Receiving Panitumumab after Progression on Cetuximab. J Cytol Histol 5:204.