Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Periodical. Pao, William, Theresa Y. Wang, Gregory J. Riely, Vincent Miller, Qiulu Pan, Marc Ladanyi, Maureen Zakowski, Robert Heelan, Mark Kris, and Harold Varmus. "KRAS Mutations and Primary Resistance of Lung Adencarcinomas to Gefitnib or Erlotinib." PLoS Medicine 2, 1 (January 2005): 57-61. Article. 5 Images.. PLoS Medicine. URL. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC545207/