Study of MK-4830 as Monotherapy and in Combination With Pembrolizumab (MK-3475) in Participants With Advanced Solid Tumors (MK-4830-001)

Merck Sharp & Dohme (MSD)

Status and phase: Active, not recruiting; Phase 1

Conditions: Neoplasms

Treatments: Biological: MK-4830A; Drug: Lenvatinib; Drug: MK-4830; Drug: Pemetrexed; Drug: Pembrolizumab; Drug: Carboplatin; Drug: Paclitaxel; Drug: Cisplatin

Study type: Interventional

Funder types: Industry

Identifiers

NCT03564691

MK-4830-001 (Other Identifier)

2023-509542-35-00 (Registry Identifier)

U1111-1300-1952 (Other Identifier)

2019-003164-53 (EudraCT Number)

4830-001

Details and patient eligibility

About

This study consists of several parts: dose escalation, dose expansion, dose expansion in Chinese participants residing in China, and coformulation. Dose escalation is to evaluate the safety, tolerability, and preliminary efficacy of MK-4830 monotherapy administration (Arms A and B) and in combination with pembrolizumab (Arm C). Dose expansion is to evaluate the objective response rate (ORR) of MK-4830 in combination with pembrolizumab (Arms A-F); evaluate the safety and tolerability of MK-4830 administered in combination with pembrolizumab, carboplatin, and pemetrexed (Arm G) and of MK-4830 administered in combination with pembrolizumab and lenvatinib (Arm H); evaluate the safety, tolerability and ORR of MK-4830 in combination with pembrolizumab plus chemotherapy (Arms I-L); and evaluate the safety and tolerability of MK-4830 in combination with pembrolizumab in Chinese participants from China (Arm M). The coformulation part (Arm N) evaluates the safety and tolerability of MK-4830A (coformulation of MK-4830 800 mg + pembrolizumab 200 mg). There is no formal hypothesis testing in this study.

Enrollment: 442 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Dose escalation participants: Has any histologically- or cytologically-confirmed advanced/metastatic solid tumor by pathology report and has received, has been intolerant to, or has been ineligible for all treatment known to confer clinical benefit. Solid tumors of any type are eligible for enrollment

• Has measurable disease by Response Evaluation Criteria In Solid Tumors version 1.1 (RECIST 1.1), Response Assessment in Neuro-Oncology (RANO), or modified RECIST (mRECIST) as assessed by the local site investigator/radiology

• Submits an evaluable baseline tumor sample for analysis (either a recent or archival tumor sample). This inclusion criterion does not apply to Expansion phase Arm M

• Dose Escalation Part C and Back-fill participants: Has 1 or more discrete malignant lesions that are amenable to biopsy

• Has a performance status of 0 or 1 on the Eastern Cooperative Oncology Group (ECOG) Performance Scale. This inclusion criterion does not apply to Expansion phase Arm B

• Demonstrates adequate organ function

• A male participant must agree to use an approved contraception(s) during the treatment period and for at least 180 days after the last dose of study treatment and refrain from donating sperm during this period

• A female participant is eligible to participate if she is not pregnant, not breastfeeding, and either not a woman of childbearing potential (WOCBP) OR if a WOCBP agrees to follow the study contraceptive guidance during the treatment period and for at least 180 days after the last dose of study treatment

• Expansion phase Arm A participants:

  • Has histologically or cytologically confirmed metastatic pancreatic adenocarcinoma
  • Received at least 1 prior line of therapy and no more than 3 prior lines of systemic therapy

• Expansion phase Arm B participants:

  • Has histologically or cytologically confirmed unresectable glioblastoma multiforme (GBM) or its variants
  • Has a Karnofsky performance status (KPS) ≥ 70
  • Has had no more than 1 prior line of therapy for GBM. Radiation with or without chemotherapy is acceptable as the prior treatment
  • Has shown unequivocal evidence for tumor progression by magnetic resonance imaging (MRI) or computed tomography (CT) scan by contrast within 2 weeks prior to randomization
  • Has an interval of at least 3 weeks (to randomization) between prior surgical resection (one week for stereotactic biopsy)
  • Has an interval of at least 12 weeks from the completion of radiation therapy to randomization unless there is unequivocal histologic confirmation of tumor progression or radiographic progression outside of the prior radiation field
  • Is neurologically stable (eg, without a progression of neurologic symptoms or requiring escalating doses of systemic steroid therapy within last 2 weeks) and clinically stable

• Expansion phase Arm C participants:

  • Has histologically confirmed recurrent or metastatic head and neck squamous cell cancer (HNSCC) of the oral cavity, oropharynx, hypopharynx, and/or larynx that is considered incurable by local therapies
  • Has experienced disease progression at any time during or after treatment with a platinum-containing (eg, carboplatin or cisplatin) regimen with or without cetuximab

• Expansion phase Arm D participants:

  • Has histologically confirmed advanced or metastatic HNSCC of the oral cavity, oropharynx, hypopharynx, and/or larynx that is considered incurable by local therapies
  • Has not had any prior programmed cell death 1 (PD-1)/ programmed cell death ligand 1 (PD-L1) therapy

• Expansion phase Arms E and F participants:

  • Has a histologically or cytologically confirmed diagnosis of advanced (Stage IIIb) or Stage IV metastatic non-small-cell lung cancer (NSCLC)
  • Has received no prior systemic therapy for chemotherapy or other targeted or biological antineoplastic therapy treatment for Stage IIIb or Stage IV metastatic NSCLC. Treatment with chemotherapy and/or radiation as part of neoadjuvant/adjuvant therapy is allowed if therapy was completed at least 6 months prior to the diagnosis of advanced disease. Participants with prior treatment with an anti-PD-1 or PD-L1 agent are not eligible

• Expansion phase Arm G participants:

  • Has a histologically or cytologically confirmed diagnosis of advanced (Stage IIIb) or Stage IV metastatic nonsquamous NSCLC (American Joint Committee on Cancer (AJCC) version 8)
  • Is able to tolerate chemotherapy with carboplatin and pemetrexed
  • Has received no prior systemic therapy for advanced NSCLC

• Expansion phase Arm H participants:

  • Has histologically confirmed diagnosis of renal cell cancer (RCC) with clear cell component with or without sarcomatoid features
  • Has locally advanced/metastatic disease or has recurrent disease
  • May have received 1 or 2 prior lines of systemic therapy for advanced RCC

• Expansion phase Arm I participants:

  • Has histologically confirmed diagnosis of recurrent and/or metastatic gastric or gastroesophageal junction adenocarcinoma that is considered incurable by local therapies
  • Has received and progressed on at least two prior chemotherapy regimens
  • If tumor was if human epidermal growth factor receptor 2 (HER2/neu) positive, participant must have previously received treatment with trastuzumab

• Expansion phase Arm J participants

  • Has histologically confirmed high-grade epithelial ovarian, fallopian tube or primary peritoneal carcinoma
  • Has received 1 or 2 prior lines of systemic therapy, including at least 1 prior platinum-based therapy
  • Has radiographic evidence of disease progression
  • Is a candidate for paclitaxel chemotherapy

• Expansion phase Arm K participants:

  • Has locally recurrent inoperable breast cancer OR have metastatic breast cancer not previously treated
  • Has confirmed triple-negative breast cancer (TNBC)
  • Has completed treatment for Stage I-III breast cancer, if indicated, and ≥6 months elapsed between the completion of treatment and first documented local or distant disease recurrence
  • Has been treated with (neo)adjuvant anthracycline

• Expansion phase Arm L participants:

  • Has histologically confirmed diagnosis of recurrent and/or advanced mesothelioma that is considered incurable by standard therapies
  • Is eligible to receive standard chemotherapy

• Expansion phase Arm M participants

  • Has any histologically or cytologically confirmed advanced/metastatic solid tumor by pathology report and have received, been intolerant of, been ineligible for, or refused all treatment known to confer clinical benefit
  • Has received up to 2 prior systemic regimens for the treatment of advanced/metastatic solid tumor
  • Is a Chinese participant residing in China

• Coformulation Arm N participants

  • Has any histologically- or cytologically-confirmed advanced/metastatic solid tumor by pathology report and have received, been intolerant to, been ineligible for, or refused all treatment known to confer clinical benefit

Exclusion criteria

• Has had chemotherapy, definitive radiation, or biological cancer therapy within 4 weeks (2 weeks for palliative radiation) prior to the first dose of study therapy, or has not recovered from any adverse events (AEs) that were due to cancer therapeutics administered more than 4 weeks earlier

• Has not recovered from all radiation-related toxicities to Grade 1 or less, requires corticosteroids, and had radiation pneumonitis

• Has a history of a second malignancy, unless potentially curative treatment has been completed with no evidence of malignancy for 2 years

• Has known untreated central nervous system metastases or known carcinomatous meningitis. This exclusion criterion does not apply to Expansion phase Arm B

• Has received any prior immunotherapy and was discontinued from that treatment due to a Grade 3 or higher immune-related AEs

• Has previously had a severe hypersensitivity reaction to treatment with a monoclonal antibody or has a known sensitivity to any component of pembrolizumab and/or chemotherapy agents

• Has an active infection requiring therapy

• Has a history or current interstitial lung disease

• Has a history of noninfectious pneumonitis that required steroids or current pneumonitis

• Has an active autoimmune disease that has required systemic treatment in the past 2 years except vitiligo or resolved childhood asthma/atopy

• Has clinically significant cardiac disease, including unstable angina, acute myocardial infarction within 6 months from Day 1 of study drug administration, or New York Heart Association Class III or IV congestive heart failure

• Has a known history of human immunodeficiency virus (HIV)

• Has a known active hepatitis B or C

• Is taking chronic systemic steroids in doses >10 mg daily of prednisone or equivalent within 7 days prior to the first dose of trial treatment

• Has not fully recovered from any effects of major surgery without significant detectable infection. Surgical proceduress that required general anesthesia must be completed at least 2 weeks before first study treatment administration. Surgery requiring regional/epidural anesthesia must be completed at least 72 hours before first study treatment administration and participants should be recovered

• Has received a live or live-attenuated virus vaccine within 30 days prior to first dose of study intervention

• Is currently participating and receiving study therapy in a study of an investigational agent or has participated and received study therapy in a study of an investigational agent or has used an investigational device within 28 days of administration of MK-4830

• All Expansion phase participants:

  • Tumor types with known MSI-high status are not eligible

• Expansion phase Arm A participants:

  • Has received more than 3 lines of prior therapy for advanced disease (pancreatic cancer)

• Expansion phase Arm B participants:

  • Has tumor primarily localized to the brainstem or spinal cord
  • Has presence of diffuse leptomeningeal disease or extracranial disease
  • Has recurrent tumor greater than 6 cm in maximum diameter
  • Requires treatment with moderate or high dose systemic corticosteroids for at least 3 days within 2 weeks of randomization

• Expansion phase Arm D participants:

  • Has received prior systemic chemotherapy or other targeted or biological antineoplastic therapy treatment for their advanced metastatic HNSCC

• Expansion phase Arm E and F participants:

  • Has received prior systemic chemotherapy or other targeted or biological antineoplastic therapy treatment for their Stage IIIb or Stage IV metastatic NSCLC
  • Has had prior treatment with any anti-PD-1, PD-L1, or programmed cell death-ligand 2 (PD-L2) agent

• Expansion phase Arm G participants:

  • Has received prior systemic chemotherapy or other targeted or biological antineoplastic therapy treatment for their Stage IIIb or Stage IV nonsquamous NSCLC
  • Has had prior treatment with any anti-PD-1, PD-L1, or PD-L2 agent

• Expansion phase Arm H participants:

  • Has a clinically significant gastrointestinal (GI) abnormality
  • Has a history of untreated deep vein thrombosis or pulmonary embolism within 6 months prior to screening
  • Has poorly controlled hypertension
  • Has active GI bleeding
  • Has evidence of inadequate wound healing
  • Has active bleeding disorder or other history of significant bleeding episodes within 30 days prior to randomization
  • Has hemoptysis within 6 weeks prior to randomization
  • Has radiographic evidence of encasement or invasion of a major blood vessel, or of intratumoral cavitation

• Expansion phase Arm I participants:

  • Has experienced weight loss > 10 % over 2 months prior to first dose of study therapy
  • Has clinical evidence of ascites
  • Has peritoneal metastases

• Expansion phase Arm J participants:

  • Has non-epithelial cancers, including borderline, malignant Müllerian mixed mucinous, malignant Brenner's tumor and undifferentiated carcinoma and/or germ cell tumors and/or sex cord - stromal tumors
  • Has received more than 2 prior lines of systemic therapy for ovarian cancer

• Expansion phase Arm K participants:

  • Has a known history of hypersensitivity or allergy to the study chemotherapies and/or any of their components

• Expansion phase Arm L participants:

  • Has a known history of hypersensitivity or allergy to the study chemotherapies and/or any of their components
  • Is receiving any medication prohibited in combination with study chemotherapies as described in the respective product labels, unless medication was stopped within 7 days prior to randomization

• All Participants (Arms A through N)

  • Has symptomatic pleural effusion (eg, cough, dyspnea, pleuritic chest pain)
  • Has had an allogenic tissue/solid organ transplant.

Trial design

Primary purpose: Treatment

Allocation: Non-Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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442 participants in 17 patient groups

Dose Escalation, Part A: MK-4830 Monotherapy

Experimental group

Description:

MK-4830 monotherapy (with MK-4830 doses determined by an accelerated titration design \[ATD\]) will be administered intravenously (IV), every 3 weeks (Q3W), starting with Cycle 1, Day 1, for a maximum of 35 cycles (up to approximately 2 years). Each cycle is 21 days. Participants enroll with histologically or cytologically confirmed pancreatic adenocarcinoma.

Treatment:

Drug: MK-4830

Dose Escalation, Part B: MK-4830 Monotherapy

Experimental group

Description:

MK-4830 monotherapy (with MK 4830 doses determined by a modified toxicity probability interval \[mTPI\] method) will be administered IV, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles (up to approximately 2 years). Each cycle is 21 days. Participants enroll with histologically or cytologically confirmed pleural or peritoneal malignant mesothelioma, epithelial, sarcomatoid, or biphasic subtypes.

Treatment:

Drug: MK-4830

Dose Escalation, Part C: MK-4830 and Pembrolizumab

Experimental group

Description:

Combination therapy with MK-4830 and pembrolizumab (with MK-4830 doses determined by an mTPI design). MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm A: Pancreatic Adenocarcinoma

Experimental group

Description:

Combination therapy with the preliminary recommended phase 2 dose (RP2D) A of MK-4830, and pembrolizumab, in participants with histologically or cytologically confirmed pancreatic adenocarcinoma. MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm B: Glioblastoma (GBM)

Experimental group

Description:

Combination therapy with the preliminary RP2D A of MK-4830, and pembrolizumab, in participants with histologically or cytologically confirmed GBM. MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm C: R/M HNSCC

Experimental group

Description:

Combination therapy with the preliminary RP2D A of MK-4830, and pembrolizumab, in participants who have histologically or cytologically-confirmed recurrent or metastatic head and neck squamous cell carcinoma (R/M HNSCC) whose disease progressed on an anti-programmed cell death 1/programmed cell death ligand 1 (PD1/L1) therapy. MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm D: PD-L1 positive HNSCC, Dose A

Experimental group

Description:

Combination therapy with the preliminary RP2D A of MK-4830, and pembrolizumab, in participants who have histologically or cytologically-confirmed advanced programmed death-ligand 1 (PD-L1) positive head and neck squamous cell carcinoma (HNSCC). MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm E: First-Line Advanced NSCLC, Dose A

Experimental group

Description:

Combination therapy with the preliminary RP2D A of MK-4830, and pembrolizumab, in participants who have histologically-confirmed, first-line treatment advanced non-small-cell-lung-cancer (NSCLC) (Stage IIIB or IV). MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm F: First-Line Advanced NSCLC, Dose B

Experimental group

Description:

Combination therapy with the preliminary RP2D B of MK-4830, and pembrolizumab, in participants who have histologically-confirmed, first-line treatment advanced non-small-cell-lung-cancer (NSCLC) (Stage IIIB or IV). MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm G: NSCLC, +Carboplatin/Pemetrexed

Experimental group

Description:

Combination therapy with the preliminary RP2D A of MK-4830, pembrolizumab, and carboplatin/pemetrexed in participants with advanced non-squamous non-small-cell-lung-cancer (NSCLC) (Stage IIIB or IV). MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles. Carboplatin and pemetrexed will be administered IV Q3W, starting with Cycle 1, Day 1, for 4 cycles, followed by pemetrexed Q3W continuous with MK-4830 and pembrolizumab, up to 35 cycles. Each cycle is 21 days (up to approximately 2 years).

Treatment:

Drug: Carboplatin

Drug: Pemetrexed

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm H: RCC, +Lenvatinib

Experimental group

Description:

Combination therapy with the preliminary RP2D A of MK-4830, pembrolizumab, and lenvatinib in participants with advanced renal cell carcinoma (RCC). MK-4830 will be administered IV, Q3W, starting with Cycle 1 following pembrolizumab infusion, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years). Lenvatinib will be administered orally once daily for up to 35 cycles of 21 days (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Drug: Lenvatinib

Dose Expansion, Arm I: R/M Gastric/GE Junction Adenocarcinoma

Experimental group

Description:

Combination therapy with the preliminary RP2D A of MK-4830, and pembrolizumab, in participants who have histologically or cytologically-confirmed recurrent or metastatic (R/M) gastric or gastroesophageal (GE) junction adenocarcinoma and who have been previously treated with at least 2 prior lines of therapy. MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm J: Ovarian Cancer

Experimental group

Description:

Triple combination therapy with pembrolizumab plus preliminary RP2D A of MK-4830 plus paclitaxel in participants who have histologically confirmed, ovarian cancer. MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1 for a maximum of 35 cycles (up to approximately 2 years). Each cycle is 21 days. Paclitaxel will be administered by IV, once every week (QW) on Days 1, 8, and 15 of each 21-day cycle until disease progression or prohibitive toxicity.

Treatment:

Drug: Paclitaxel

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm K: Triple negative Breast Cancer (TNBC)

Experimental group

Description:

Triple combination therapy with pembrolizumab plus preliminary RP2D A of MK-4830 plus paclitaxel in participants who have histologically confirmed TNBC. MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1 for a maximum of 35 cycles (up to approximately 2 years). Each cycle is 21 days. Paclitaxel will be administered by IV on Days 1, 8, and 15 every 4 weeks (Q4W) until disease progression or prohibitive toxicity.

Treatment:

Drug: Paclitaxel

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm L: Mesothelioma

Experimental group

Description:

Triple combination therapy with pembrolizumab plus preliminary RP2D A of MK-4830 plus pemetrexed plus cisplatin in participants who have histologically confirmed advanced mesothelioma. MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1 for a maximum of 35 cycles (up to approximately 2 years). Each cycle is 21 days. Pemetrexed will be administered by IV, on Day 1 of each Q3W cycle for a maximum of 6 cycles. Each cycle is 21 days. Cisplatin will be administered by IV, on Day 1 of each Q3W cycle for a maximum of 6 cycles. Each cycle is 21 days.

Treatment:

Drug: Cisplatin

Drug: Pemetrexed

Drug: Pembrolizumab

Drug: MK-4830

Dose Expansion, Arm M: Advanced Solid Tumor in Chinese Participants In China

Experimental group

Description:

Combination therapy with the preliminary RP2D A of MK-4830, and pembrolizumab, in Chinese participants, who reside in China, have histologically or cytologically-confirmed advanced/metastatic solid tumor, and who have been previously treated with at least 2 prior lines of therapy. MK-4830 will be administered IV following pembrolizumab infusion, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles. Each cycle is 21 days. Pembrolizumab will be administered by IV, Q3W, starting with Cycle 1, Day 1. Each cycle is 21 days. The combination may be administered for a maximum of 35 cycles (up to approximately 2 years).

Treatment:

Drug: Pembrolizumab

Drug: MK-4830

Coformulation Phase, Arm N: MK-4830A (Coformulation of MK-4830 + pembrolizumab)

Experimental group

Description:

Monotherapy with MK-4830A, a coformulation of MK-4830 800 mg + pembrolizumab 200 mg, in participants with histologically or cytologically-confirmed advanced/metastatic solid tumor, and who and have received, been intolerant to, been ineligible for, or refused all treatment known to confer clinical benefit. MK-4830A will be administered IV, Q3W, starting with Cycle 1, Day 1, for a maximum of 35 cycles (up to approximately 2 years). Each cycle is 21 days.

Treatment:

Biological: MK-4830A