9781422280331

Words to Understand

benign: not harmful. carcinogens: substances that can cause cancer to develop. epithelial: a type of human tissue; includes the outer layer of skin and the lining of organs. genes: units of hereditary information. lymphatic system: part of the human immune system; transports white blood cells around the body. malignant: harmful; relating to tumors, likely to spread. mutation: a change in structure, particularly of a cell in this context. prognosis: the likely outcome of a disease.

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