The purpose of this study is to confirm the tolerability of recommended Phase 2 dose (RP2D) of Lazertinib (Phase 1), to determine the tolerability and identify the recommended Phase 2 combination dose of Lazertinib when combined with Amivantamab (JNJ-61186372) (Phase 1b), to characterize the safety and tolerability of Lazertinib and Amivantamab combinations at the RP2CD in participants with advanced non-small cell lung cancer (NSCLC) with documented advanced or metastatic epidermal growth factor receptor (EGFR) mutation (Phase 1b expansion cohorts A, B, C, D and E), to estimate the antitumor activity of Lazertinib and Amivantamab combinations at the RP2CD in participants with advanced NSCLC with documented advanced or metastatic EGFR mutation (Phase 1b expansion cohorts A, B, C, and D), to validate the biomarker identified in Phase 1b expansion Cohort D as a predictor of antitumor activity of Lazertinib and Amivantamab combination (Cohort E) or Amivantamab monotherapy (Cohort F) in participants with osimertinib-relapsed, chemotherapy-naïve, EGFR Exon19del or L858R mutated NSCLC, to identify the recommended Phase 2 dose (RP2ChD) of Lazertinib when combined with Amivantamab and standard of care chemotherapy and to determine the tolerability of the Lazertinib, Amivantamab, and platinum-doublet chemotherapy (LACP) combination (Phase 1b LACP combination cohort) and to characterize the safety and tolerability of Lazertinib at the RP2ChD and Amivantamab and standard of care chemotherapy in participants with advanced or metastatic EGFR-mutated NSCLC (Phase 1b LACP combination cohort), to assess 2 potential biomarker strategies to identify participants at increased, or decreased, probability of tumor response with JNJ-61186372 and lazertinib combination in participants with EGFR Exon19del or L858R mutated NSCLC progressed on or after osimertinib (Phase 1b expansion Cohort D).

Lung cancer is one of the most common types of cancer and is also the most common cause of death from cancer. NSCLC accounts for 85 percent (%) to 90% of lung cancers. Lazertinib is an oral, highly potent, mutant-selective, and irreversible EGFR-tyrosine kinase inhibitor (TKI) targeting both, the T790M mutation and activating EGFR mutations while sparing wild type EGFR. JNJ-61186372 (also referred to as amivantamab), is a low fucose, fully human immunoglobulin G1(IgG1)-based bispecific antibody. As a third generation EGFR-TKI targeting activating EGFR mutations, lazertinib has a distinct mechanism of action from JNJ-61186372, which targets the extracellular domains of both the EGFR and cMet proteins. The distinct mechanisms of action of lazertinib and JNJ-61186372 suggests potential to improve clinical outcomes through the combination of these two molecules. Phase 1 and 1b lazertinib + amivantamab, and Phase 1b LACP combination cohort are divided into 2 periods: screening and treatment period whereas Phase 1b expansion cohorts are divided into 3 periods: screening, treatment, and post-treatment follow up period. Safety assessment will include adverse events (AEs), serious adverse events (SAEs), physical examinations, Eastern Cooperative Oncology Group (ECOG) criteria for performance status, laboratory tests, vital signs, electrocardiograms, chest x-ray, baseline ophthalmologic examination (Phase 1b Expansion Cohorts), echocardiography or multigated acquisition, and concomitant medication usage. The overall duration of the study will be up to 5 years and 2 months.

Inclusion Criteria:

• Phase 1 and Phase 1b lazertinib+Amivantamab combination cohorts: Histologically or cytologically confirmed non-small cell lung cancer (NSCLC) with previously epidermal growth factor receptor (EGFR) mutation (identified locally in a Clinical Laboratory Improvement Amendments [CLIA]-certified laboratory [or equivalent]) that is metastatic or unresectable, and have progressed after standard of care front-line therapy, and exhausted available options with targeted therapy. A participant who has refused all other currently available therapeutic options is allowed to enroll

• For the Phase 1b Lazertinib, Amivantamab and Platinum-doublet Chemotherapy (LACP) combination cohort: histologically or cytologically confirmed advanced or metastatic EGFR-mutated NSCLC who have progressed on or after an EGFR-TKI as the most recent line of treatment with a maximum of 3 prior lines of therapy in the metastatic setting allowed

• For all expansion cohorts, the EGFR mutation must have been previously histologically or cytologically characterized, as performed by a CLIA-certified (US sites) or an accredited (outside of US) local laboratory, with a copy of the mutation analysis being submitted during screening (Phase 1b expansion Cohort B, C, D, E, and F)

  1. Expansion Cohort A: Participant must have advanced or metastatic EGFR-mutated non-small cell lung cancer (NSCLC) that has progressed on prior treatment with osimertinib in the first or second line, followed by progression on a platinum-based chemotherapy regimen as the last line of therapy prior to study enrollment. Prior use of first or second generation EGFR tyrosine kinase inhibitor (TKI) is allowed if administered prior to osimertinib
  2. Expansion Cohort B: Participant must have previously treated, advanced or metastatic NSCLC with documented primary EGFR Exon 20ins activating mutation. Participants should have been treated with standard of care, platinum-based chemotherapy regimens, but may have treated with approved EGFR TKI, investigational EGFR, or immunotherapy agents if refusing front line platinum-based chemotherapy standard of care. Up to 3 lines of prior systemic anti-cancer treatment are allowed
  3. Expansion Cohort C: Participant must have advanced or metastatic NSCLC characterized by an uncommon activating mutation Additional uncommon EGFR mutations/alterations, beyond those listed above, may be considered for enrollment after agreement with the medical monitor. Participants may be treatment naïve or have been treated with one prior line of therapy which must be a first or second generation TKI (that is gefitinib, erlotinib, afatinib) in the most recent line of therapy. Prior chemotherapy is allowed if administered prior to EGFR TKI therapy, or as the only systemic anti-cancer therapy prior to study enrollment. Up to 2 lines of prior systemic anti-cancer treatment are allowed
  4. Expansion Cohort D, E, and F: Participant must have advanced or metastatic EGFR-mutated NSCLC (EGFR Exon19 deletion or L858R) that has progressed on prior treatment with osimertinib in the first or second line (after first- or second-generation EGFR TKI), as the immediate prior line of therapy. Only previous treatment in the metastatic setting with a first, second, or third generation EGFR TKI is allowed. In addition, participants considered for Cohorts E and F must be eligible for, and agree to comply with, the use of prophylactic anticoagulation with a direct oral anticoagulant or a low molecular weight heparin during the first 4 months (from Day 1 through Day 120) according to national comprehensive cancer network (NCCN) or local guidelines, if assigned to the combination Cohort E

• Evaluable disease

• Eastern Cooperative Oncology Group (ECOG) performance status grade of 0 or 1

• Participants must meet the study protocol defined laboratory criteria without having a history of red blood cell transfusion, platelet transfusion, or granulocyte-colony stimulating factor support within 7 days prior to the date of the test

• A woman of childbearing potential: Must have a negative serum beta human chorionic gonadotropin at screening; Must agree not to breast-feed during the study and for 6 months after the last dose of study intervention. (Enrollment is not allowed even if a woman who is breast-feeding stops breast-feeding); Must agree not to donate eggs (ova, oocytes) for the purposes of assisted reproduction during the study and for 6 months after receiving the last dose of study intervention

Exclusion Criteria:

• Participant has an uncontrolled illness, including but not limited to uncontrolled diabetes, ongoing or active infection (includes infection requiring treatment with antimicrobial therapy [participants will be required to complete antibiotics 1 week prior to study treatment] or diagnosed or suspected viral infection); active bleeding diathesis; Impaired oxygenation requiring continuous oxygen supplementation; Refractory nausea and vomiting, chronic gastrointestinal diseases, inability to swallow the formulated product, or previous significant bowel resection that would preclude adequate absorption of study treatment; or psychiatric illness or any other circumstances (including social circumstances) that would limit compliance with study requirements. Any ophthalmologic condition that is either clinically unstable or requires treatment
• Prior treatment with anti programmed cell death-1 (PD-1) or anti programmed cell death-ligand 1 (PD-L1) antibody within 6 weeks of planned first dose of study intervention
• Untreated brain or other central nervous system (CNS) metastases whether symptomatic or asymptomatic. Participants who have completed definitive therapy, are not on steroids, and have a stable clinical status for at least 2 weeks prior to study treatment may be eligible for Phase 1b expansion cohorts. If brain metastases are diagnosed on Screening imaging, the participant may be enrolled, or rescreened for eligibility, after definitive treatment if above criteria are met
• Any Toxicities from prior anticancer therapy must have resolved to common terminology criteria for adverse events (CTCAE) version 5.0 Grade 1 or baseline level (except for alopecia [any grade], Grade <=2 peripheral neuropathy, and Grade <=2 hypothyroidism stable on hormone replacement therapy)
• Allergies, hypersensitivity, or intolerance to Lazertinib or JNJ-61186372 or their excipients. For the LACP combination cohort: participant has a contraindication for the use of carboplatin or pemetrexed (refer to local prescribing information for each agent). Participant has a history of hypersensitivity to, or cannot take, vitamin B12 or folic acid

The data sharing policy of the Janssen Pharmaceutical Companies of Johnson & Johnson is available at www.janssen.com/clinical trials/transparency. As noted on this site, requests for access to the study data can be submitted through Yale open Data Access (YODA) Project site at yoda.yale.edu