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Debulking surgery removes only part of a tumor because removing the entire cancer would be too risky or cause extensive damage. Debulking surgery is usually followed by chemotherapy or radiation to kill or shrink the rest of the tumor. It can also make subsequent therapy more effective.

Deductible is the amount of money a health insurance company requires you to pay out-of-pocket annually before you begin receiving any coverage for medical expenses.

Differentiation drugs are a type of chemotherapy that causes immature cancer cells to function more like normal cells, limiting their reproduction. Differentiation drugs are usually used in combination with other chemotherapy agents.

DNA (deoxyribonucleic acid) is the material inside the cells of every living organism that stores its genetic information and passes it to the next generation of cells. New research and many emerging new treatments aim at manipulating the specific DNA of cancer cells to make them behave more like normal cells, inhibit tumor growth, or stimulate an immune response.

DNA replication occurs when genetic material in a cell's nucleus uncoils to make an exact copy of itself. Some chemotherapy agents aim to block this process to stop cancer cells from reproducing.

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