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Computed tomography of five patients with stage IV colorectal cancer in whom KRAS was not detectable. White arrows indicate the metastatic tumors. In all five cases, the size and the number of metastatic tumors were very small (<1.5 cm) (arrows). (a) Case 4. (b) Case 8. (c) Case 16. (d) Case 33. (e) Case 34.
