But if I am healthy to begin with, I am 100% certain to get the crippling side effects of chemotherapy if I decide to take it.
False.
Though the benefits of chemo are dubious in an adjuvant setting, your age and health going into chemo have almost no bearing whatsoever on how severe your side effects will be. When I was first starting chemo, I sat with a 70 year old man who was towards the end of his 12 cycle folfox regimen. He said his side effects were minimal and no big deal all the time. He was older and frail and had no serious side effects. I also had few serious side effects. Annoying ones, for sure, but nothing debillitating at all, and I was young/healthy. I've met plenty of folks on this board whom have had little to almost no side effects of varying ages and health. Likewise I've met plenty who have had difficult side effects of varying ages and health. Bottom line, making blanket statements about what group of people will get severe chemo side effects is pretty useless.
Moving on, chemotherapy for colon cancer is nowhere near as bad as you may have been led to believe. I'm not going to say it's a walk in the park, but it's far from the debillitating nightmare modern cinema/TV will have you believe. I can promise you that you will have far more good days than bad during chemotherapy. I can also promise you that you will NOT know how bad the treatment is without trying it. There are many ways we may be able to assist you in your journey through chemo, so you won't be alone. Also remember there are multiple different types of chemo, and it is possible to do just a 5FU and/or Xeloda course of chemo and really have very few side effects at all. You can also try heavier duty chemo like folfox and if it's debillitating and you hate it, you can stop doing it. It's not like chemo is some contract written in un-breakable stone. You can start/stop/try things, etc.
Lastly, you do not mention having gone through chemo/radiation prior to surgery. This would make some sense when they initially thought a T2 tumor. IF this is true and you have NOT had chemo/rad, the stats you're quoting are only correct for distant recurrence (ie liver, lungs, lymph, etc). You will have a significantly higher risk of local recurrence with the deeper penetration through the wall seen in pathology for rectal cancer. That risk is separate from and in addition to your systemic risk. I don't know the exact numbers so I won't try and quote them, but I do know that the benefits of chemo/rad in preventing LOCAL (ie pelvic) recurrence are much greater than the 7-12% boost systemic folfox gives. Chemo/rad has a far greater positive impact on local recurrence (and by association overall survival) than systemic folfox does. I would STRONGLY suggest doing that as a minimum. It can be done post-operatively so your "window" for doing it has not closed.
Long story short, talk with your doctors, try and remove blanket assumptions from your opinions, and lean on us here for support. Always ask yourself when choosing to treat or not to treat, "If I choose to NOT do treatment, AND the cancer returns, will I kick myself for that inaction?" If you can TRULY answer "no" then feel free to refuse treatment.
11/13/09 5cm Stage IV 9/25 lymph nodes w/2cm peritoneal met at 29 YoA
12/15/09 LA right hemi-colectomy
6/16/10 Folfox
FINISHED8/10/10 Prophylactic HIPEC
10/9/10 got Married
Still NED and living life to the fullest
"Can any one of you by worrying add a single hour to your life."