It seems that you are in a position similar to a multitude of 1st-time, cancer survivors. You had a cancer, now it's "cured" and you are declared "cancer-free" - but oncologists always recommend that last little 3%-5% be treated. This is where the expertise and experience of your oncologist becomes critical.
As a care-giver and and familiar with cancer treatment in general from an observational position, my recommendation is:
1) Practice a healthy life-style - using all the recommended tools - exercise, diet (low animal fat intake), weight control, etc. etc.
2) Get regular and frequent check-ups from a cancer-oriented facility. Blood analysis, CT-Scans, MRI, PT-SCans - whatever is needed. Insurance will cover it and it gives a series of 'bench-marks' for the experts to refer to. Pay close attention to results, select a treatment source that you trust COMPLETELY. By 'cancer oriented', I mean a facility such as Cancer Treatment Centers of America or similar to it. This is where you get the best advice, cutting edge technology, and cancer-experienced specialists.
Agreeing to oncological treatment now - without expert consultations collectivly agreeing is taking a chance on extremely invasive measures upsetting your life and quality of life. Chemotherapy and how it is is delivered to an individual patient is extremely touchy and unpredictable as to severity of side-effects. It should only be prescribed and administered by the most experienced technician with literally thousands of patients to his credit.
Play it safe and adopt a wait-and-see time period with multiple, frequent check-ups from the best and most eperienced facility availabel to you - and today there are many. If you have to travel, don't hesitate, just do it.
I recommend Cancer Treatment Centers of America. They saved our sanity, quality of life, and literally, my wife's life after her inital oncologist gave her 6 mos. to live. CTCA continues watching her like a hawk with full check-ups every 90 days - for awhile, at least.
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Good Luck and God Bless You