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This study compares Pembrolizumab against high-dose Interferon Alfa-2b or Ipilimumab in patients with stage III-IV high-risk melanoma (a type of skin cancer) that has been completely removed by surgery. Adults aged 18 and over whose melanoma has been fully resected and who have not previously received immunotherapy may take part. The study is being conducted in Phase 3 and is active but not currently recruiting.
The summary above is a plain-language rendering of the official record. The original English title is shown for reference.
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Criteria are reproduced from the ClinicalTrials.gov record in the original English. Only the trial team can determine eligibility.
Inclusion Criteria: * STEP 1 REGISTRATION: * Patients must have completely resected melanoma of cutaneous origin or of unknown primary in order to be eligible for this study; patients must be classified as stage IIIA (N2a), IIIB, IIIC, or stage IV melanoma; patients with non-ulcerated T1b N1a disease are not eligible; patients with melanoma of mucosal or other non-cutaneous origin are eligible; patients with melanoma of ocular origin are not eligible; patients with a history of brain metastases are ineligible * Patients are eligible for this trial either at initial presentation of their melanoma or at the time of the first detected nodal, satellite/in-transit, distant metastases, or recurrent disease in prior lymphadenectomy basin or distant site; nodal, satellite/in-transit metastasis, distant metastases or disease in a prior complete lymphadenectomy basin must have been confirmed histologically by hematoxylin and eosin (H \& E) stained slides * Patients with multiple regional nodal basin involvement are eligible; gross or microscopic extracapsular nodal extension is permitted * Patients at initial presentation of melanoma must undergo an adequate wide excision of the primary lesion, if present; patients with previously diagnosed melanoma must have had all current disease resected with pathologically negative margins and must have no evidence of disease at the primary site or must undergo re-resection of the primary site; a full lymphadenectomy meeting the criteria outlined is required for all node-positive patients including those with positive sentinel nodes; patients with recurrent disease who have had a prior complete lymphadenectomy fulfill this requirement as long as all recurrent disease has been resected; for all patients, all disease must have been resected with negative pathological margins and no clinical, radiologic, or pathological evidence of any incompletely resected melanoma; patients must be registered within 98 days of the last surgery performed to render the patient free of disease * Patients must have available and be willing to submit a minimum of five unstained slides from primary, lymph node, or metastatic site to determine PD-L1 expression; the tumor tissue must be adequate for PD-L1 testing (defined as \>= 100 tumor cells as confirmed by the treating institution's local pathologist); this must be documented by having a pathologist sign the S1404 Local Pathology Review form prior to step 1 registration; the specimens may come from an archived block but must be submitted within 20 days from cutting the slides * Patients must be offered the opportunity to participate in specimen banking as outlined * Patients must be willing to have blood draws for PK/ADA analysis as outlined, should the patient be randomized to the MK-3475 arm * Patients may have received prior radiation therapy, including after the surgical resection; all adverse events associated with prior surgery and radiation therapy must have resolved to =\< grade 1 prior to registration * Patients must not have received neoadjuvant treatment for their melanoma; patients must not have had prior immunotherapy including, but not limited to ipilimumab, interferon alfa-2b, high dose IL-2, pegylated (PEG)-IFN, anti-PD-1, anti-PD-L1 intra-tumoral, or vaccine therapies; patients must not be planning to receive any of the prohibited therapies during the screening or treatment phases of the study * Patients must not be planning to receive concomitant other biologic therapy, radiation therapy, hormonal therapy, other chemotherapy, surgery or other therapy after step 2 registration * All patients must have disease-free status documented by a complete physical examination and imaging studies within 42 days prior to registration; imaging studies must include a total body positron emission tomography (PET)-computed tomography (CT) scan that is of diagnostic quality (with or without brain) or a CT of the chest, abdomen and pelvis; for patients with melanoma arising from the head and neck, dedicated neck imaging (CT with IV contrast or PET-CT through the region) is required; if the patient has had unknown primary with disease in the axilla, neck imaging is required to assure region is clear of cancer; CT imaging should be done with intravenous contrast if there are no contraindications for it; any other clinically-indicated imaging studies if performed (e.g. bone scan) must show no evidence of disease * All patients must have a CT or magnetic resonance imaging (MRI) of the brain within 90 days prior to registration; the brain CT or MRI should be performed with intravenous contrast (unless contraindicated) * Absolute neutrophil count (ANC) \>= 1,500 microliter (mcL) (within 42 days prior to registration) * Platelets \>= 100,000 mcL (within 42 days prior to registration) * Hemoglobin \>= 10 g/dL (within 42 days prior to registration) * Total bilirubin =\< 1.5 x institutional upper limit of normal (IULN) (except Gilbert's syndrome, who must have a total bilirubin \< 3.0 mg/dL) (within 42 days prior to registration) * Serum glutamic oxaloacetic transaminase (SGOT) (aspartate aminotransferase \[AST\]) and serum glutamate pyruvate transaminase (SGPT) (alanine aminotransferase \[ALT\]) =\< 2 x IULN (within 42 days prior to registration) * Alkaline phosphatase =\< 2 x IULN (within 42 days prior to registration) * Serum creatinine =\< IULN OR measured or calculated creatinine clearance \>= 60 mL/min (within 42 days prior to registration) * Patients must have lactate dehydrogenase (LDH) performed within 42 days prior to registration * Patients must have Zubrod performance status =\< 1 * Patients must have a baseline electrocardiogram (ECG) performed within 42 days of registration that is normal or considered not clinically significant by the site investigator * Patients must not have a history of (non-infectious) pneumonitis that required steroids or current pneumonitis * Patients must not have an active infection requiring systemic therapy * Patients must not have active autoimmune disease that has required systemic treatment in past 2 years (i.e., with use of disease modifying agents, corticosteroids or immunosuppressive drugs); replacement therapy (e.g., thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency, etc.) is not considered a form of systemic treatment * Patients must not have received live vaccines within 42 days prior to registration; examples of live vaccines include, but are not limited to, the following: measles, mumps, rubella, chicken pox, shingles, yellow fever, rabies, bacillus Calmette-Guerin (BCG), and typhoid (oral) vaccine; seasonal influenza vaccines for injection are generally killed virus vaccines and are allowed; however, intranasal influenza vaccines (e.g., Flu-Mist) are live attenuated vaccines, and are not allowed * Patients known to be human immunodeficiency virus (HIV) positive are eligible if they meet the following criteria within 30 days prior to registration: stable and adequate cluster of differentiation 4 (CD4) counts (\>= 350 mm\^3), and serum HIV viral load of \< 25,000 IU/ml; patients may be on or off anti-viral therapy so long as they meet the CD4 count criteria * Patients must not have known active hepatitis B virus (HBV) or hepatitis C virus (HCV) infection prior to registration * Patients must not have a history or current evidence of any condition, therapy or laboratory abnormality that might confound the trial results, interfere with the patient's participation for the full duration of the trial, or indicate that participation in the trial is not in the patient's best interests, in the opinion of the treating investigator * No other prior malignancy is allowed except for the following: adequately treated basal cell or squamous cell skin cancer, in situ cervical cancer, lobular carcinoma of the breast in situ, atypical melanocytic hyperplasia or melanoma in situ, adequately treated stage I or II cancer (including multiple primary melanomas) from which the patient is currently in complete remission, or any other cancer from which the patient has been disease free for three years * Women of childbearing potential must have a negative urine or serum pregnancy test within 28 days prior to registration; women/men of reproductive potential must have agreed to use an effective contraceptive method for the course of the study through 120 days after the last dose of study medication; should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately; a woman is considered to be of "reproductive potential" if she has had menses at any time in the preceding 12 consecutive months; in addition to routine contraceptive methods, "effective contraception" also includes heterosexual celibacy and surgery intended to prevent pregnancy (or with a side-effect of pregnancy prevention) defined as a hysterectomy, bilateral oophorectomy, or bilateral tubal ligation; however, if at any point a previously celibate patient chooses to become heterosexually active during the time period for use of contraceptive measures, he/she is responsible for beginning contraceptive measures; patients must not be pregnant or nursing due to unknown teratogenic side effects * Patients who are able to complete questionnaires in English, Spanish or French must participate in the quality of life assessments; (those patients who cannot complete the quality of life questionnaires in English, Spanish or French can be registered to S1404 without contributing to the quality of life studies) * Patients must be informed of the investigational nature of this study and must sign and give written informed consent for this protocol in accordance with institutional and federal guidelines * As a part of the Oncology Patient Enrollment Network (OPEN) registration process the treating institution's identity is provided in order to ensure that the current (within 365 days) date of institutional review board approval for this study has been entered in the system * STEP 2 REGISTRATION (RANDOMIZATION CRITERIA): * Patients must not be registered until receiving confirmation from the Southwest Oncology Group (SWOG) Statistical Center that the patient's tissue specimen was adequate for PD-L1 testing; patients must be registered within 7 working days of receiving the e-mail notification * Women of childbearing potential must plan to have a urine or serum pregnancy test within 72 hours prior to receiving the first dose of study medication; if the urine test is positive or cannot be confirmed as negative, a negative serum pregnancy test will be required * No tests or exams are required to be repeated for step 2 registration (randomization); however, patients who are known to have a change in eligibility status after step 1 registration are not eligible for step 2 registration; for example, ANC is not required to be repeated between step 1 and step 2 registration, but the most recent ANC performed before step 2 registration is required to be \>= 1,500 mcL