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.
Markman M, Kelsen D.Markman M, et al. Among authors: kelsen d.J Cancer Res Clin Oncol. 1992;118(7):547-50. doi: 10.1007/BF01225271.J Cancer Res Clin Oncol. 1992.PMID: 1624547Clinical Trial.