Cancer is a group of diseases characterized by the uncontrolled growth and spread of abnormal cells in the body. Normally, cells in the body grow, divide, and die in an orderly and controlled manner. However, cancer cells continue to grow and divide uncontrollably, forming a mass of tissue called a tumor.
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There are many different types of cancer, each with its own unique characteristics and behavior. In general, cancer develops when changes occur in the DNA of normal cells, causing them to grow and divide abnormally. These changes can be caused by a variety of factors, including genetic mutations, exposure to radiation or certain chemicals, and lifestyle factors such as smoking, poor diet, and lack of exercise.
As cancer cells continue to grow and divide, they can invade nearby tissues and organs, and eventually spread to other parts of the body through the bloodstream or lymphatic system. This process is called metastasis and is a key feature of advanced cancer.
The symptoms and treatment options for cancer depend on the type and stage of the disease, as well as the individual patient's overall health and other factors. Treatment may include surgery, radiation therapy, chemotherapy, immunotherapy, and other approaches aimed at controlling or eliminating the cancer cells.
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