ASCO 2005 guideline says that there was agreement by its experts that not all patients with stage II and III require CT followup; nevertheless, they could not agree on any other measure of high risk beyond staging and recommended followup by CT annually for stage II and III NCCN supprots CT6-12mo, except when Ct scans are not definitve, when a PET can be considered.
NCCN, colon cancer, COL-8
http://www.asco.org/asco/downloads/CRC_G-line_Summary.pdf
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