opdivo for lung cancer

http://www.cancer.gov/news-events/nci-update/2015/fda-opdivo?cid=tw_ncimain_nci_Lung.fda.immunotherapy_sf37211139

PD1 as checkpoint inhibitors

http://www.npr.org/blogs/health/2015/02/09/373292216/harnessing-the-immune-system-to-fight-cancer