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Primary brain tumors include any tumor that starts in the brain. Tumors may be confined to a small area, invasive(spread to nearby areas), benign(not cancerous), or malignant(cancerous).Tumors can directly destroy brain cells.
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Your body is always changing. If you have gray hair or stretch marks, you've probably noticed how your body can change. You may not always notice other ways that your body can change, however. For example, your body's cells constantly change, dividing and creating new cells. You might not notice it when, as your cells divide and copy their DNA (their genetic information), a mutation is introduced.
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In a strict sense, mutations are changes in genes not caused by genetic recombination. A change in the base sequence of DNA, for example, represents a mutational change.
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