Many cancers can be prevented by not smoking, maintaining a healthy weight, not drinking too much alcohol , eating plenty of vegetables , fruits and whole grains , vaccination against certain infectious diseases, not eating too much processed and red meat , and avoiding too much sunlight exposure.   Early detection through screening is useful for cervical and colorectal cancer .  The benefits of screening in breast cancer are controversial.   Cancer is often treated with some combination of radiation therapy , surgery, chemotherapy , and targeted therapy .   Pain and symptom management are an important part of care.  Palliative care is particularly important in people with advanced disease.  The chance of survival depends on the type of cancer and extent of disease at the start of treatment.  In children under 15 at diagnosis the five-year survival rate in the developed world is on average 80%.  For cancer in the United States the average five-year survival rate is 66%. 
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