Hello,
Welcome to Healthcaremagic.
From your query i understood that your father is in advanced stage of adenocarcinoma
rectum without any metastasis.
Early rectal cancers have very good prognosis.
If cancer cells have not invaded the rectal muscular wall, 90%of them can be cured by surgery.
If the cancer has breached the rectal muscular wall and gone to the regional
lymph nodes, approximately 60% of rectal cancer patients will still survive at least 5 years.
If the rectal cancer tumour has spread to other organs such as the
liver or lung, the 5 year survival is only 10%.
Surgery ie. Resection and
colostomy followed by
chemotherapy is the main treatment even in the advanced stage for rectal and anal cancers.
Since he is advanced stage, At Least he need some Palliative surgery for tumour.
Hope this helps.
Take care of your father.