Novel HER-2 Targeted Therapies in Breast Cancer

Simple Summary HER-2-targeting drugs changed the paradigm of HER-2-positive breast cancer, improving survival rates of an aggressive and lethal disease. Recently, a plethora of new drugs have been approved in different settings, leading to a continuous change in the treatment algorithm of HER-2-positive breast cancer. This current review aims to summarize all the new approved therapeutic options and highlight the new therapeutic options under development.Abstract Human epidermal growth factor 2 (HER-2)-positive breast cancer represents 15-20% of all breast cancer subtypes and has an aggressive biological behavior with worse prognosis. The development of HER-2-targeted therapies has changed the disease's course, having a direct impact on survival rates and quality of life. Drug development of HER-2-targeting therapies is a prolific field, with numerous new therapeutic strategies showing survival benefits and gaining regulatory approval in recent years. Furthermore, the acknowledgement of the survival impact of HER-2-directed therapies on HER-2-low breast cancer has contributed even more to advances in the field. The present review aims to summarize the newly approved therapeutic strategies for HER-2-positive breast cancer and review the new and exploratory HER-2-targeted therapies currently under development.