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For some people, surgery may be too risky. These people have other options for treating their kidney cancers, including: Treatment to freeze cancer cells. Recent studies show cryoablation may be useful for treating kidney tumors that cant be removed through surgery. During cryoablation, one or more special needles are inserted through small incisions in your skin and into the tumor. Gas in the needles creates extreme cold that causes the cells around the point of each needle to freeze. Doctors use CT scans to monitor the procedure and to ensure that all of the visible cancer tissue and some of the surrounding healthy tissue is frozen. Another type of gas in the needles creates warmth to thaw the frozen tissue. Then the process is repeated. The cycles of freezing and thawing cause cancer cells to die. You may experience some pain after the procedure. Rare side effects may include bleeding, infection and damage to tissue surrounding the tumor. Kidney cancer that recurs and kidney cancer that spreads to other parts of the body may also be curable. In these situations, treatments may include: Drugs that use your immune system to fight cancer. Biological therapy uses your bodys immune system to fight cancer. Drugs in this category include interferon and interleukin-2, which are synthetic versions of chemicals made in your body. These biological therapy drugs have serious side effects, including chills, fever, nausea, vomiting and loss of appetite. | 
