As your onc said, you're not at the *higher* risk of recurrence (re:"the CC Onc stated was I had a non aggressive tumor type and there is no reason to believe they didn't get it all. He didn't like the amount of lymph nodes but believe it was localized. Told me to eat healthy, exercise and they will scan more frequently). But you are at risk of recurrence. I'm not one who likes chemotherapy but this is from this past weekend, at ASCO GI 2017 Prevalence and survival benefit of adjuvant chemotherapy in stage III colon cancer patients: Comparison of overall and age-stratified results by multivariable modeling and propensity score methodology in a population-based cohort: http://meetinglibrary.asco.org/content/174566-195
However, IF you would feel better doing some adjuvant treatment, the alternatives might be:
1. the NCCC guidelines call for a *reduction* of the 5-FU (the intravenous one, or the oral capecitabine); it could be a big reduction. Still, it's risky if you really have a DPD deficiency.
If your onc is a creative one, irinotecan + cetuximab (Erbitux) can be used, or irinotecan + bevazizumab (Avastin) (oxaliplatin requires 5-Fu to work, irinotecan, not so much). You have a good old discussion here, from people who were in your situation (but dealing with stage IV): viewtopic.php?t=33179
2. Look for a trial for Stage III patients, or NED patients, immunotherapy. There is that trial I mentioned for NED in other thread (https://clinicaltrials.gov/ct2/show/NCT02960594
) and also a trial for Stage III patients at Duke, with a vaccine, to prevent recurrence: https://clinicaltrials.gov/ct2/show/NCT01890213
Four immunizations. It lists as inclusion criteria that the patients have to had chemo first but I would call anyway, to explain your situation --that criteria might be more flexible than what we imagine. Might be other trials out there, those are the two I can think of immediately : )
And if you op for following your onc advise, there are many off-labels and supplements that might help you, to prevent recurrence. You need to take a decision.