This study is a randomized, open-label, multicenter Phase III clinical trial evaluating patients with EGFR-mutant locally advanced or metastatic NSCLC. The Phase III study is planned to enroll approximately 680 participants, who will be randomized in a 1:1 ratio into the following groups:
Test group: SYS6010 + osimertinib Control group: Investigator's choice of one treatment（Osimertinib or Osimertinib+ Chemotherapy）
Age 18 ~ 75 (inclusive) years old, regardless of gender;
Patients with pathologically confirmed locally advanced or metastatic NSCLC, including: patients with stage IIIB or IIIC based on AJCC staging version 8 who are not suitable for surgical resection or radical chemoradiotherapy, or patients with stage IV NSCLC. For the dose escalation phase, patients must have EGFR-mutant locally advanced or metastatic NSCLC that has failed previous standard therapy, and for the dose selection phase and phase III study, patients must have EGFR-mutant locally advanced or metastatic NSCLC, which has not received EGFR-TKIs or other systemic therapy before. Patients who have received adjuvant/neoadjuvant chemotherapy may be included if disease progression occurred at least 6 months after completing treatment;
Carry at least one EGFR-sensitive mutation (ex19del or L858R, which can be combined with other EGFR mutations). EGFR mutation: Stage Ib: can be enrolled based on previous test results. Phase III: Take the test results of the central laboratory as the admission group;
At least one measurable lesion confirmed by CT or MRI, as defined by RECIST v1.1 criteria;
Patients with meningeal metastases, brainstem metastases, spinal cord metastases and/or compression, or active CNS metastases;
History of other malignant tumors within 3 years prior to the first use of study drug, except for the following conditions: cured skin basal cell or squamous cell carcinoma, superficial bladder cancer, prostate carcinoma in situ, or cervical carcinoma in situ, etc.;
Known allergies to SYS6010 or any ingredient of Osimertinib, or to humanized monoclonal antibodies;
Adverse events caused by prior anti-tumor therapy that have not resolved to ≤ Grade 1 (as per NCI-CTCAE v6.0), except for Grade 2 alopecia or peripheral neuropathy deemed by the investigator not to pose a safety risk;