What is the treatment for jejunal cancer that is best and has fewest side effects?

Multidisiplinary: There are several types of jejunal cancer: adenocarcinoma, carcinoid, stromal, and lymphoma are the most common. Surgery for tumor removal if possible, followed by cemotherapy+/- radiation therapy is the usual treatment plan. A team of medical personnel includuing a surgeon, medical oncologist, and radiation oncologist is the better approach to jejunal and other cancers.

Depends: Depends on type of cancer, how much, location, other factors including extent of disease/spread, predisposing factors, e.g. Ibd, celiac disease. Generally requires surgery, perhaps chemotherapy. Check with GI md, oncologist (cancer specialist), surgeon.