Locally Advanced Metastatic Or Recurrent Non Small Cell Lung Cancer Nsclc Harboring Epidermal Growth Factor Receptor Egfr Mutations

This is a Phase II study evaluating the safety, tolerability, pharmacokinetics, and preliminary efficacy of JS212 in combination with JS111 in patients with advanced or metastatic non-small cell lung cancer (NSCLC) harboring EGFR-sensitizing mutations who have progressed after prior EGFR-TKI therapy. The study consists of two parts: a dose-escalation phase followed by an expansion phase. Approximately 30 participants will be enrolled. The dose-escalation phase will explore the safety and tolerability of escalating doses of JS212 in combination with a fixed dose of JS111, using a Bayesian optimal interval (BOIN) design. Based on safety and tolerability data, a recommended Phase III dose (RP3D) will be determined. The expansion phase will further evaluate safety and preliminary anti-tumor activity at the selected dose level.