• Merck Oncology
• 18 Nov, 2017

What is lung cancer? Lung cancer is a disease that starts in the lungs. When a person has lung cancer, they have uncontrolled growth of abnormal cells that cluster together to form a tumor. As these cells grow, they can interfere with the functioning of the lung, which provides oxygen to the body via the blood. Most people with lung cancer don't have symptoms until the cancer is advanced.
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