EIK1005-002: A Clinical Research Study Evaluating EIK1005, a Werner Helicase Inhibitor, as Monotherapy and in Combination With Pembrolizumab in Participants With Advanced Solid Tumors Including Microsatellite Instability High (MSI-H) Tumors

is ≥ 18 years of age at the time of signing the informed consent.

has a life expectancy of at least 3 months.

has histologically or cytologically documented advanced (unresectable and/or metastatic) solid tumor. Part 1A: recommend that participants have archival tissue not more than 3 years old. Part 1B and Part 2: participant has locally confirmed Microsatellite Instability High (MSI-H) or Mismatch Repair Deficient (dMMR) tumor. Participant must have archival tumor tissue (not more than 3 years old) for retrospective confirmation of MSI-H or dMMR tumor by a central laboratory.

In Part 1A, has received and then progressed after or is intolerant to at least 1 standard treatment regimen in the advanced setting. The participant does not have alternative therapeutic options per PI's medical judgement. Preference should be given to: (1) participants with MSI-H or dMMR cancers that have progressed after checkpoint inhibitor (CPI) therapy and (2) participants with microsatellite stable cells (MSS) cancers that have progressed following at least one regimen of platinum, alkylating or topoisomerase containing chemotherapy.