Inetetamab Combined With Pyrotinib and Chemotherapy in the Treatment of HER2 Positive Metastatic Breast Cancer

Trastuzumab is the first target drug for HER2 positive metastatic breast cancer, which can significantly improve the survival of patients with HER2 positive metastatic breast cancer and become the first-line standard treatment. However, the selection of second-line targeted drugs after the failure of trastuzumab treatment has become a new difficulty and challenge. Studies have shown that the ADCC effect is one of the main mechanisms of the anti-tumor effect of trastuzumab. Therefore, Inetetamab, a new antibody to optimize the ADCC effect, has become one of the second-line treatment options after trastuzumab fails, showing good survival benefits. Pyrotinib, another second-line HER2 targeted drug, is a typical representative of TKI drugs, which not only has a strong HER2 antagonistic effect but also can synergize with monoclonal antibodies to amplify the ADCC effect. As two important class 1.1 innovative drugs in China, Pyrotinib and Inetetamab showed excellent anti-tumor efficacy and good safety in TKI and optimized ADCC respectively. Considering that the current guidelines recommend the combination of multiple anti-HER2 targeted drugs, and basic research also shows that Pyrotinib and Inetetamab have a synergistic effect, we plan to carry out a phase II single-arm clinical study to evaluate the efficacy and safety of "Inetetamab combined with Pyrotinib and chemotherapy" in the treatment of her positive metastatic breast cancer, so as to provide better results for patients with HER2 positive metastatic breast cancer Treatment options!