1. Able and willing to provide a written informed consent
2. 18-75 years old (inclusive of both ends)
3. ECOG score of 0 or 1.
4. Patients with histologically or cytologically confirmed advanced or metastatic NSCLC.
5. Subjects with central laboratory- confirmed functional HER2 mutations
6. No prior systemic antitumor therapy (including investigational agents) for advanced or metastatic NSCLC.
7. Have at least one measurable lesion outside the central nervous system that meets the criteria defined by RECIST v1.1
8. Protocol-defined adequate organ function including cardiac, renal, hepatic function
You may not be if
1. Mixed lung cancer with small cell components and sarcomatoid carcinoma confirmed by histology or cytology.
2. Concurrently carrying other driver gene mutations, and targeted drugs for such driver gene mutations have been approved for market release.
3. Subjects with untreated or active metastasis of central nervous system (CNS) tumors, or a history of meningeal metastasis or current meningeal metastasis.
4. With poorly controlled tumor-related pain.
5. previous or current with other malignancies.
6. Subjects with a history of interstitial pneumonia/non-infectious pneumonia requiring hormone therapy, or current interstitial pneumonia/non-infectious pneumonia.
7. Subjects with active or previous autoimmune diseases.
8. Subjects with uncontrolled or severe cardiovascular diseases.
9. Subjects with active hepatitis B or hepatitis C.
