<qa>  What is the name of the type of tumor mutations in the EGFR gene?1. Patients who are known to have somatic tumor mutations in the following genes, for which targeted agents are available that directly affect the treatment of brain metastasis: Anaplastic lymphoma kinase ALK, epidermal growth factor receptor EGFR, ROS-1 proto-oncogene, and proto-oncogene B-RAF 