Pts had advanced/metastatic solid tumors with germline PTEN-inactivating mutations…Unconfirmed partial response was observed in 1 pt with breast cancer; 6 pts had stable disease. A pt with breast cancer had stable disease of >8 months associated with a target lesion tumor shrinkage of ≈15%....TAS-117 showed tolerable toxicity; durable clinical benefit associated with tumor shrinkage was observed in 1 pt.