An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Johnson CA, Kilpatrick D, von Roemeling R, Langer C, Graham MA, Greenslade D, Kennedy G, Keenan E, O'Dwyer PJ.Johnson CA, et al.J Clin Oncol. 1997 Feb;15(2):773-80. doi: 10.1200/JCO.1997.15.2.773.J Clin Oncol. 1997.PMID: 9053504Clinical Trial.