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, as being higher risk. NCCN contradicts itself. It the algorithm it sppifically states that only patients with high risk features, which it defines as lyphovascular invasion or high grade, should be followed by CT but in its narraitve section it says that stage II and III are appropriate for annual CT followup. Overal, I would recommend annual CT for up to 5 years in all stage II and resected patients.
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