A Study of NVL-330 in Patients With Advanced or Metastatic HER2-altered NSCLC (HEROEX-1)

Inclusion Criteria: 1. Age ≥ 18 years 2. Histologically or cytologically confirmed locally advanced or metastatic NSCLC 3. Documented HER2 status as follows: 1. Phase 1a: Documented oncogenic HER2 mutation such as HER2 exon20 insertion mutations or single nucleotide variants or HER2 amplification. 2. Phase 1b: Documented oncogenic HER2 mutation. 4. Identification of lesions as follows: 1. Phase 1a: Must have evaluable disease (target or nontarget) according to RECIST 1.1. 2. Phase 1b: Must have measurable disease, defined as ≥ 1 radiologically measurable target lesion according to RECIST 1.1. 5. Adequate organ function and bone marrow reserve Exclusion Criteria: 1. Participant's cancer has known oncogenic driver alteration other than HER2 2. Known allergy/hypersensitivity to excipients of NVL-330 3. Major surgery within 4 weeks of the first dose of study drug 4. Ongoing or recent anticancer therapy 5. Actively receiving systemic treatment or direct medical intervention on another therapeutic clinical study