Beamion LUNG-3: Adjuvant Zongertinib vs Standard Treatment in People With Completely Resected Stage II-IIIB NSCLC Harboring Activating HER2 TKD Mutations

This is a global, randomized, open-label, Phase 3 study designed to assess the efficacy and safety of zongertinib as adjuvant therapy in participants with completely resected Stage II-IIIB NSCLC and HER2 TKD-activating mutations.

Participants must have undergone complete resection and received perioperative systemic therapy consistent with current standards, including either neoadjuvant platinum-based chemotherapy with or without immunotherapy, or adjuvant platinum-based chemotherapy.

After completing surgery and required systemic treatment, eligible participants are randomized 1:1 to receive either Zongertinib taken orally once daily for up to 3 years, or standard treatment, which may include an approved adjuvant immunotherapy agent administered according to its label, or observation, depending on local clinical practice and patient status.

The primary objective is to evaluate whether zongertinib improves disease-free survival (DFS) compared with standard treatment. Secondary objectives include overall survival (OS), safety, tolerability, and patient-reported outcomes.

Primary Outcome Measures

1. Disease-free survival (DFS) by investigator's assessment
   DFS is defined as the time from randomization until recurrence of tumor or death from any cause, whichever occurs earlier

Secondary Outcome Measures

1. Key secondary endpoint: Overall survival (OS), defined as the time from randomization until death from any cause
2. Occurrence of trial-related Adverse Events (AEs) ≥ Grade 3 from first treatment administration (or from randomization for patients in the observation arm) until the earliest of tumor recurrence or 3 years since treatment start
   AEs are graded according to Common Terminology Criteria for Adverse Events (CTCAE) version 5.0