Our expert says:
Colon cancer can be healed by operation if the tumour did not yet penetrate the whole thickness of the bowel. Yes it is a risk to operate on a 84 year old, and yes, it is major surgery, but if you leave it and it spreads, her 5 year survival is almost nil. On top of that she may end up with metastasis and bowel obstruction because of the tumour. She may need chemotherapy if the cancer is right through the bowel or into the lymphglands - but that is her own choice.
Good luck with the difficult decision!
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