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mRNA-4157 [Personalized cancer vaccine] alone or in combination with Keytruda. In Part C, admits MSS-CRC patients who not have received prior anti‑PD‑1/PD-L1 therapy, AND have measurable disease at study entry.

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* Parts A, A2, and D: Participants must be clinically disease-free at study entry (that is, participants in the adjuvant setting).
* Part B: Participants must have one of the histologically- or cytologically-confirmed unresectable (locally advanced or metastatic) protocol-specified solid malignancies, have measurable disease at study entry defined by RECIST 1.1., and be considered suitable for treatment with pembrolizumab; in this study pembrolizumab will be considered an investigational study drug.
* Part C: Participants must have one of the histologically- or cytologically confirmed unresectable (locally advanced or metastatic) protocol-specified solid malignancies, must not have received prior anti-programmed cell death protein 1 (PD-1)/programmed death -ligand 1 (PD-L1) therapy, and must have measurable disease at study entry defined by RECIST 1.1.
* Part A2: Participants with histologically confirmed PDAC who have undergone complete macroscopic resection(that is, R0 - no cancer cells within 1 mm of all resection margins or R1 - cancer cells present within 1 mm of one or more resection margins) who had no evidence of metastatic disease with adequate recovery from surgery to receive adjuvant therapy.
* Parts E1 and E2: Participants with untreated histologically/cytologically confirmed Stage II-IIIB NSCLC (per AJCC version 8) that is considered resectable of non-squamous (adenocarcinoma only) or squamous cell carcinoma histology, absence of major associated pathologies that increase the surgery risk to an unacceptable level, must have a tumor tissue sample available for NGS and PD-L1 IHC testing as defined in the Laboratory Manual.
* Part E3: Participants with untreated, locally advanced surgically resectable, histologically/cytologically confirmed, gastric/GEJ adenocarcinoma, as defined by a primary lesion that is T3 or greater or with the presence of any positive clinical nodes (N+) and without evidence of metastatic disease, measurable disease according to RECIST version 1.1, absence of major associated pathologies that increase the surgery risk to an unacceptable level, must have a tumor tissue sample available for NGS and PD-L1 IHC testing as defined in the Laboratory Manual.
* Part D: Participants with completely resected Stage II, III or IV cutaneous melanoma.
* Parts A, A2, and D: Participants must have a formalin-fixed paraffin embedded (FFPE) tumor sample available (for example, from their prior surgery) that is suitable for the next generation sequencing (NGS) required for this study.
* Parts B and C: Participants must have at least 1 lesion amenable to the mandatory fresh tumor biopsy at study entry.
* Participants must have resolution of toxic effect(s) (as specified in the protocol) from prior therapy to Grade 1 or less.
* Participant is willing to use an adequate method of contraception for the course of the study through 120 days after the last dose of study drug (male and female participants of childbearing potential), or for a specified time after the last dose of SoC chemotherapy per SoC product labeling, whichever is later.
* Participants with Performance Scale (PS) of 0 or 1 on the Eastern Cooperative Oncology Group (ECOG) PS.

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* Treatment with any of the following:

1. Any investigational agents, anti-cancer monoclonal antibody, anti-cancer therapeutic vaccine, immunostimulant (for example, IL-2), or study drugs from a previous clinical study within 4 weeks of the first dose of mRNA-4157 or pembrolizumab (note only a 2 week wash out is required from prior pembrolizumab treatment)
2. Any chemotherapy, targeted small molecule therapy, or radiation therapy within 2 weeks of the first dose of mRNA-4157 or pembrolizumab
3. Live-virus vaccination within 30 days of the first dose of mRNA-4157 or pembrolizumab. Seasonal flu vaccines that do not contain live virus are permitted.
4. Any systemic steroid therapy or other form of immunosuppressive therapy within 7 days of the first dose of mRNA-4157 or pembrolizumab
5. Transfusion of blood products (including platelets or red blood cells [RBCs]) or administration of colony stimulating factors (including granulocyte colony stimulating factor [G-CSF], granulocyte/macrophage colony stimulating factor [GM-CSF], or recombinant erythropoietin) within 1 week of the NGS blood sample during screening, and 4 weeks of the first dose of mRNA-4157 or pembrolizumab
* A history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the study, interfere with participation for the full duration of the study, or is not in the best interest of the participant to participate, in the opinion of the treating Investigator
* Known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the trial
* Previously identified hypersensitivity to components of the formulations used in this study
* Known additional malignancy that is progressing or requires active treatment, exceptions include basal cell carcinoma of the skin, squamous cell carcinoma of the skin that has undergone curative therapy, or in situ cervical cancer.

Note: Additional inclusion/exclusion criteria may apply, per protocol.