ERBB2 and metastatic neoplasm: For patients with metastatic diseases whose tumors harbor particular genetic profiles, such as the over-expression of the human epidermal growth factor receptor-2 (HER-2) or neurotrophic tropomyosin receptor kinase (NTRK)- gene fusions, microsatellite instability, mismatched repair genes or programmed cell death ligand 1 (PD-L1) over-expression, targeted therapy or immunotherapy may be beneficial.