COLIN CUTHBERT / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / SCIENCE PHOTO LIBRARY
Cancer chemotherapy. Nurse giving an intravenous dose of chemotherapy drugs to a young boy with cancer. The drugs are designed to destroy cancer cells. Because they target all rapidly dividing cells, they kill healthy cells in some tissues, producing side effects such as hair loss and nausea. Cancer is a disease caused by the uncontrolled division of abnormal cells.
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