A Clinical Trial of Adjuvant Intismeran (V940) With or Without Pembrolizumab Coformulated With Berahyaluronidase Alfa (MK-3475A) in High-Risk Stage I Non-Small Cell Lung Cancer (V940-014)

Inclusion Criteria:

The main inclusion criteria include but are not limited to the following:

* Has a histological diagnosis of pathological Stage I (tumor ≤4 cm) non-small cell lung cancer (NSCLC) per American Joint Committee on Cancer (AJCC) 9th Edition with at least 1of the following high-risk pathologic features as assessed locally: tumor size \>2cm, visceral pleural invasion, lymphovascular invasion, or high-grade histology
* Has undergone a complete surgical resection of the primary NSCLC
* Has not received other prior treatment outside of definitive surgery (including but not limited to chemotherapy, immunotherapy, targeted therapy, or radiotherapy) for their current Stage I NSCLC
* Has provided a tissue sample from recent surgery along with the required blood sample
* Human immunodeficiency virus (HIV)-infected participants must have well-controlled HIV on antiretroviral therapy (ART)
* Participants who are hepatitis B surface antigen (HBsAg) positive are eligible if they have received hepatitis B virus (HBV) antiviral therapy for at least 4 weeks, and have undetectable HBV viral load prior to randomization
* Participants with history of hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable at screening

Exclusion Criteria:

The main exclusion criteria include but are not limited to the following:

* Has diagnosis of any 1 of the following: small cell lung cancer (SCLC) or, for mixed tumors, presence of small cell elements, neuroendocrine tumor with large cell components, sarcomatoid carcinoma, or two synchronous primary NSCLCs
* Has any clinically significant cardiovascular disease within 12 months before randomization, including a history of coronary artery bypass grafting (CABG) or percutaneous coronary intervention (PCI), valvular heart disease requiring surgical intervention, New York Heart Association Class III-IV heart failure, unstable angina, myocardial infarction (MI), pulmonary hypertension, cardiovascular accident (CVA), or hemodynamically unstable cardiac arrhythmia
* HIV-infected participants with a history of Kaposi's sarcoma and/or Multicentric Castleman's Disease
* Has known additional malignancy that is progressing or has required active treatment within the past 3 years
* Has active autoimmune disease that has required systemic treatment in the past 2 years. Hormonal supplementation (eg, thyroxine, insulin, or physiologic corticosteroid) is allowed
* Has history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease
* Has active infection requiring systemic therapy other than those permitted in protocol
* Has history of stem cell/solid organ transplant
* Participants who have not adequately recovered from major surgery or have ongoing surgical complications