A Study to Assess Efficacy and Safety of Pembrolizumab With or Without Sacituzumab Tirumotecan (MK- 2870) in Adult Participants With Resectable Non Small Cell Lung Cancer (NSCLC) Not Achieving Pathological Complete Response (pCR) (MK-2870-019)

BIOLOGICAL

Sacituzumab tirumotecan

Sacituzumab tirumotecan to be administered as 4mg/kg IV infusion q2w for up to 24 weeks

BIOLOGICAL

Pembrolizumab

Pembrolizumab to be administered 400mg by IV infusion q6w for up to 42 weeks

DRUG

Cisplatin

Cisplatin is administered as 75 mg/m\^2 IV infusion q3w for up to 12 weeks as background treatment in neoadjuvant phase

DRUG

Pemetrexed

Pemetrexed will be administered in the neoadjuvant phase as 500 mg/m\^2 IV infusion q3w for up to 12 weeks as background treatment in participants with nonsquamous NSCLC.

DRUG

Gemcitabine

Gemcitabine will be administered in the neoadjuvant phase as 1000 mg/m\^2 or 1250 mg/m\^2 IV infusion on day 1 and day 8 q3w for up to 24 weeks as background treatment in participants with squamous NSCLC.

DRUG

Carboplatin

Carboplatin will be administered in the neoadjuvant phase as AUC 5 mg/mL/min or AUC 6 mg/mL/min IV infusion q3w for up to 12 weeks as background treatment.

DRUG

Paclitaxel

Paclitaxel will be administered in the neoadjuvant phase as 175 mg/m\^2 or 200 mg/m\^2 IV infusion q3w for up to 12 weeks as background treatment.

DRUG

Rescue medication

Participants are permitted to take rescue medications to prevent hypersensitivity and/or infusion reactions as a premedication to study treatment. Rescue medications include antihistamine, H2 receptor antagonist, acetaminophen or equivalent, dexamethasone or equivalent, and granulocyte colony-stimulating factor. A steroid mouthwash (dexamethasone or equivalent) may be given as prophylaxis for stomatitis/oral mucositis.

Disease-free survival (DFS) as assessed by Blinded Independent Central Review (BICR)

Time frame: Up to ~ 93 months

DFS is defined as the time from randomization to any recurrence (local, locoregional, regional or distant), occurrence of new primary NSCLC, or death due to any cause, whichever occurs first.

What is a clinical trial?

A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.

Is it safe to participate?

Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.

Will I be compensated?

Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.

Will I receive a placebo instead of treatment?

When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.

Can I leave a trial if I change my mind?

Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.

How long does a clinical trial last?

Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.