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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The longest a person has survived after a heart transplant is 24 years.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.