A Study to Investigate Ubamatamab With and Without Marlotamig (REGN7075) in Adult Participants With Advanced/Metastatic Non-Small Cell Lung Cancer (NSCLC)

Inclusion Criteria

• Has histologically or cytologically confirmed diagnosis of advanced (stage IIIB not amenable to definitive chemoradiotherapy or stage IIIC) or metastatic (stage IV) NSCLC
• Has received appropriate first line standard of care treatment for advanced or metastatic NSCLC, as described in the protocol
• If platinum doublet chemotherapy was not administered as first line therapy, it is required in a later line of therapy prior to enrollment unless there is a documented reason why it is not appropriate
• Has tumor tissue (archival or fresh) available for testing MUC16 expression by immunohistochemistry inclusion (IHC), as described in the protocol
• Has at least 1 radiographically measurable lesion by Computed Tomography (CT) or Magnetic Resonance Imaging (MRI) per RECIST v1.1 criteria. Target lesions may be located in a previously irradiated field if there is documented (radiographic) disease progression in that site
• Has an Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 Key

Exclusion Criteria

• Has progression of disease fewer than 84 days from starting initial anti-Programmed Cell Death (PD)-(L) 1 therapy
• Experienced toxicity related to prior treatment that has not resolved to grade 1 prior to initiation of study intervention (except alopecia, hearing loss, grade 2 neuropathy, or endocrinopathy managed with hormone replacement therapy)
• Has untreated or active primary brain tumor, Central Nervous System (CNS) metastases, leptomeningeal disease, or spinal cord compression, as described in the protocol
• Current participation OR past participation in another investigational study in which an investigational intervention (eg, drug, vaccine, invasive device) was administered within 4 weeks before planned first dose of study intervention in this clinical study
• Has received prior monoclonal antibody against PD-(L)1 within 21 days of the first dose of study intervention
• Has had other prior anti-cancer immunotherapy within 21 days prior to study intervention, as described in the protocol
• Has received prior cytotoxic chemotherapy within 21 days of the first dose of study intervention
• Has received an anti-EGFR antibody therapy within the following drug-specific window prior to first dose of study intervention (approximately 5 half-lives), as described in the protocol NOTE: Other protocol defined inclusion / exclusion criteria apply