This study will be divided into two stages, in the first stage (phase 2) participants will receive 1 of 2 doses of telisotuzumab adizutecan. In the second stage (phase 3) participants will receive the recommended phase 3 dose (RP3D) of telisotuzumab adizutecan, from the previous stage, or SOC. Approximately 430 adult participants with NSCLC will be enrolled in the study in 200 sites around the world.
In phase 2, participants will receive 1 of 2 intravenous (IV) doses of telisotuzumab adizutecan. In phase 3, participants will receive the IV RP3D of telisotuzumab adizutecan, or SOC. The study will run for a duration of approximately 69 months.

Telisotuzumab adizutecan is an investigational drug being developed for the treatment of NSCLC.

• Histologically or cytologically confirmed diagnosis of locally advanced or metastatic non-squamous non-small cell lung cancer (NSCLC) with documented EGFR Exon 19 deletion or Exon21 L858R mutation.
• Provide archived or recently obtained tumor tissue during Screening.
• Received one prior third-generation epidermal growth factor receptor tyrosine kinase inhibitor (EGFR TKI) therapy in the adjuvant, locally advanced, or metastatic setting, either as monotherapy or in combination with other agents, and experienced documented radiographic disease progression on or after therapy for the most recent regimen administered prior to study entry.
• Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 to 1.
• At least 1 measurable lesion per Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1, that has not been previously irradiated.
• Central nervous system (CNS) metastasis, these should be clinically asymptomatic or stable after definitive treatment.
• Current, historical, or suspected interstitial lung disease (ILD)/pneumonitis that required steroids should be excluded.
• If the prior third-generation EGFR TKI was administered in the adjuvant setting, progression must have occurred while on treatment.

• Tumor(s) have adenosquamous or squamous histology or sarcomatoid features.
• Received more than 1 line of systemic therapy in the locally advanced or metastatic setting.
• Have any clinically significant medical conditions or any other reason that the investigator determines would interfere with the participant's participation