RecruitingDrug trialEfficacy and Safety of Inetetamab Combined With Pyrotinib and Vinorelbine in ABCThis is a prospective, no interventional, single arm cohort study, which aims to study the efficacy and safety of inetetamab combined with pyrotinib and vinorelbine in the Treatment of HER2 positive advanced breast cancer in the real world. The study will be conducted by signing an informed consent form for study enrollment, collecting patient case information, and conducting observation and follow-up.