| http://www.w3.org/ns/prov#value | - The PHS II is ongoing.For more information about clinical trials, visit cancer.gov/clinicaltrials or clinicaltrials.gov, or use the RePORTER tool at projectreporter.nih.gov/reporter.cfm.What is chemoprevention?Chemoprevention is the use of drugs, vitamins, or other substances to lower the risk of cancer, or keep it from recurring.
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