The present invention relates to anti-HER2 binding molecules (e.g., antibodies and antigen binding fragments thereof), derived HER2-binding molecules (e.g., bispecific anti-HER2 antibodies), and antibody-drug conjugates (ADC) that bind the extracellular domain of the HER2 receptor. Also provided are pharmaceutical formulation comprising the disclosed compositions and method for the treating diseases associated with HER2-mediated signal transduction.本發明係關於結合HER2受體之細胞外域的抗-HER2結合分子(例如抗體及其抗原結合片段)、衍生之HER2結合分子(例如雙特異性抗-HER2抗體)及抗體-藥物結合物(ADC)。亦提供包含所揭示之組合物的醫藥調配物及用於治療與HER2介導之信號轉導相關之疾病的方法。