The purpose of this study is to evaluate the effect of steady-state concentrations of lazertinib on the single-dose pharmacokinetics (PK) of probe substrates (midazolam, rosuvastatin, and metformin) in healthy adult participants.

Inclusion Criteria:

• Healthy on the basis of medical history at screening only, and physical examination, vital signs, and 12-lead electrocardiogram (ECG) performed at screening and at admission to the study center
• Healthy on the basis of clinical laboratory tests performed at screening and at admission to the study center.
• A woman who is considered surgically sterile but not postmenopausal, must have a negative highly sensitive serum (beta-human chorionic gonadotropin [beta-hCG]) at screening and a negative urine pregnancy test on Study Day 1. (exemptions: pregnancy test not required in female participants with prior hysterectomy or prior bilateral oophorectomy)
• Male participants must agree to use an adequate contraception method as deemed appropriate by the investigator
• Non-smoker or not using tobacco containing products for at least 6 months before first study drug administration and test negative for cotinine at screening and Study Day 1

Exclusion Criteria:

• History of malignancy within 5 years before screening (exceptions are squamous and basal cell carcinomas of the skin and carcinoma in situ of the cervix, or malignancy, that in the opinion of the investigator, with written concurrence with the sponsor's medical monitor is considered cured with minimal risk of recurrence)
• History of suspected or confirmed coronavirus disease 2019 within 4 weeks before intake of study drug, or tests positive for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) at admission to the study site
• Known allergies, hypersensitivity, or intolerance to lazertinib or its excipients or probe substrates
• Taken any disallowed therapies, concomitant therapy before the planned first dose of study drug
• Had major surgery, (example, requiring general anesthesia) within 8 weeks before screening, or will not have fully recovered from surgery, or has surgery planned during the time the participant is expected to participate in the study or within 4 weeks after the last dose of study drug administration

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