People are asked to take or do something.
In some studies, people are asked to do something
to lower cancer risk. For example:
- Exercise
- Follow a special diet.
In most studies, people are asked to take something
to lower cancer risk. For example:
- Take a medicine
- Take a vitamin.
When people are asked to take something,
it may be:
- The standard agent: A medicine or vitamin that is
already used to prevent a certain cancer
- The study agent: A new medicine or vitamin that
doctors hope will be better than what is already used to
prevent a certain cancer
- The placebo: A pill that has no medicine at all. It helps
doctors figure out whether or not the study agent really
works to prevent cancer.
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