Could colon cancer t4 , no positive nodes, but isolated tumor deposits found in pericolic tissue be cured with chemotherapy and radiation?

Surgery is the best : Shot. A T4 lesion means the cancer has grown outside the walls of the colon and into adjacent structures. If all of the cancer can be surgically removed you can be cured. Often we add chemotherapy and radiation if there are positive microscopic cells left behind. Newer techniques such as hipec are also used in these cases.

Surgery best shot: Prior md already covered this well...Best chance is removal of all tumor if that is possible.

Possibly: T4 means metastasis to other organ(s) the liver is the common site. Liver with with 1-2 adjacent spots is possible to do surgery for curative purpose. Will need chemotherapy. Surgeon and oncologist need to work together. Large comprehensive cancer center are better in managing metastatic colon cancer when curative surgery is a possible option. Radiation is usually for rectal cancer not colon ca.