Coexistent mutations of KRAS and PIK3CA affect the efficacy of NVP‐BEZ235, a dual PI3K/MTOR inhibitor,in regulating the PI3K/MTOR pathway in colorectal cancer
1. Laboratory of Experimental Pathology, Korea Institute of Radiological and Medical Science, , Seoul, Korea;2. Department of Pathology, Korea Institute of Radiological and Medical Science, , Seoul, Korea