Moderately differentiated locally infiltrative adenocarcinoma without lymph node involvement and metastasis (t3n0m0) proves it is a slowly growing cancer
. But because the size is big and local invasion has occurred. There is always a chance that some seedlings might have spread which are so small that can not be seen now. Being of microscopic size. But may show up in due course. Hence I opine that you opt for chemotherapy
and stay under close followup. Trying other branches of medicine will remain open at any instance. But chemo is the need of the hour.