Sacituzumab Tirumotecan in Combination With Furmonertinib as Second-line Treatment for EGFR-mutant Advanced or Metastatic NSCLC After Failure of First-line Third-generation EGFR-TKI Therapy

fixed dosage 4mg/kg iv, D1, D15, each 4 weeks one cycle. Drug reduction will be implemented according to the research plan.

160mg QD or 80mg QD, each 4 weeks one cycle, according to the safety run-in phase, until confirmed by the investigator as imaging disease progression, intolerable toxicity, subject's request to terrminate treatment, or other treatment termination criteria specified in the protocol. Drug reduction will be implemented according to the research plan.