I am really sorry to hear about your dad.In stage 2 the cancer might extend and invade the nearby tissue from the wall of colon.Usually surgery is recommended for this and is the only treatment required.But chemotherapy is advised when there are risk factors of the symptoms appearing again.
There are various factors to be taken into consideration for chemotherapy as the extent of the disease,lymph node involvement, microscopic view suggesting abnormality,colon obstruction etc which help in deciding the treatment plan.Your treating Physician would be the best to guide you as he has physically examined and investigated you.Kindly be in follow up with him and take the treatment as advised.
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