Confirmed partial responses (PR) in RECIST criteria were experienced by two patients, both receiving intermittent AZD5363 dosing (480 mg 4 days on/3 days off and 640 mg 2 days on/5 days off). Tumor samples from these two responders were subjected to mutation profiling by next-generation sequencing and each was found to have AKT1E17K mutation in archival primary tumor.