A Phase 1/2, Open-Label Study to Evaluate the Safety, Tolerability, Pharmacokinetics and Efficacy of TNG260 as Single Agent and in Combination With an Anti-PD-1 Antibody In Patients With STK11 Mutated Advanced Solid Tumors

Inclusion Criteria: * Is ≥18 years of age at the time of signature of the main study ICF. * Has ECOG performance status of 0 or 1. * Has measurable disease based on RECIST v1.1. * All participants must have documented STK11 mutation in a solid tumor, which is identified through a validated analytical method * Has confirmed histologic or cytologic diagnosis of a locally advanced or metastatic solid tumor. * Adequate organ function/reserve per local labs * Adequate liver function per local labs * Adequate renal function per local labs * Negative serum pregnancy test result at screening * Written informed consent must be obtained according to local guidelines Exclusion Criteria: * Known allergies, hypersensitivity, or intolerance to TNG260, PD-1 antibody or its excipients * Uncontrolled intercurrent illness that will limit compliance with the study requirements * Active infection requiring systemic therapy * Currently participating in or has planned participation in a study of another investigational agent or device * Impairment of GI function or disease that may significantly alter the absorption of oral TNG260 * Active prior or concurrent malignancy. * Central nervous system metastases associated with progressive neurological symptoms * Current active liver disease from any cause * Clinically relevant cardiovascular disease * A female patient who is pregnant or lactating