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Any change that is not normal in the genes in a cell. The change can result in a damaged gene, missing gene, or a gene that ends up in the wrong place. It may be caused by mistakes when a cell divides. It may be caused by something in the environment. The change (called a mutation) can be harmful, good, or have no effect. If this happens in a mother's egg or a father's sperm, it can be passed on to the parent's child. Some of these changes can lead to cancer or other diseases.

Read about genetics and breast cancer risk.

Hyde pierce david tcm8 329521

Audio contributed by: David Hyde Pierce

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