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Most often, colon cancer spreads to the liver, but it can also spread to the ovaries, lungs, or brain. Colon cancer tends to spread to the liver first, because all of the blood from the colon drains to the liver before proceeding to the rest of the body.
Cancer begins when a cell begins dividing uncontrollably. Eventually these cells form a visible mass or tumor. This initial tumor is called the primary tumor. Cells from the primary tumor can break off and lodge elsewhere in the body where they then grow into secondary tumors. This process is called metastasis and a cancer which has spread to other organs is called metastatic.. When cancer spreads to another organ, the type of cancer remains the type of the primary tumor. Thus cancer that started in the colon and spread to the liver is still colon cancer. It is not liver cancer.