Scagliotti G, Hanna N, Fossella F, Sugarman K, Blatter J, Peterson P, et al. The Differe ntial Efficacy of Pemetrexed According to NSCLC Histology: A Review of Two Phase III Studies The Oncologist 2009;14:253 –263 72. Sharma P, Hu -Lieskovan S, Wargo JA, Ribas A. Primary, Adaptive, and Acquired Resistance to Cancer Immunotherapy. Cell.