研究指出結腸和胰腺癌效果不好，為什麽？

Colon and pancreatic cancer did not have a response.
Topalian SL, Hodi FS, Brahmer JR, Gettinger SN, Smith DC, McDermott DF, Powderly JD, Carvajal RD, Sosman JA, Atkins MB, Leming PD, Spigel DR, Antonia SJ, Horn L, Drake CG, Pardoll DM, Chen L, Sharfman WH, Anders RA, Taube JM, McMiller TL, Xu H, Korman AJ, Jure-Kunkel M, Agrawal S, McDonald D, Kollia GD, Gupta A, Wigginton JM, Sznol M (June 2012). "Safety, Activity, and Immune Correlates of Anti–PD-1 Antibody in Cancer". New England Journal of Medicine 366 (26): 2443–54.