A Study to Assess the Relative Bioavailability, Effect of Food, and Gastric Potential Hydrogen (pH) Modification on the Pharmacokinetics (PK) of TAK-931 in Participants With Advanced Solid Tumors

The drug being tested in this study is called TAK-931. TAK 931 is being tested to treat participants who have advanced solid tumors. This study will look at relative bioavailability, effect of food and gastric pH modification on the PK of TAK-931.

The study will enroll approximately 44 participants. The study will be conducted in 2 parts: Part 1 and Part 2. In Part 1 and Part 2, participants will be randomly assigned (by chance, like flipping a coin) in a crossover design. In Part 1, participants will be assigned to 1 of the 2 following treatment sequences:

• TAK-931 80 mg PIC + TAK-931 80 mg Tablet
• TAK-931 80 mg Tablet + TAK-931 80 mg PIC

Part 2 of the study will be initiated, once the preliminary PK data from Part 1 is available to determine the relative bioavailability of the tablet formulation in reference to PIC and to calculate the single dose of TAK-931 tablet to be used in Part 2.In Part 2, participants will be assigned to 1 of the 2 following treatment sequences:

• TAK-931 TBD Fed + TAK-931 TBD Fasted
• TAK-931 TBD Fasted + TAK-931 TBD Fed

This multi-center trial will be conducted in the Netherlands. The overall time to participate in this study is approximately 2 years. Participants will make multiple visits to the clinic and will be contacted for approximately 30 days after receiving their last dose of study drug or until the start of subsequent anticancer therapy, whichever occurs first for a follow up assessment.

Inclusion criteria

• Adult participants with histologically or cytologically confirmed metastatic or locally advanced or metastatic solid tumors for whom there is no available standard treatment with proven survival benefit, this therapy is not indicated, or it is refused by the participant. Based on the nonclinical data, the following indications may have a higher probability of clinical benefit: high-grade serous ovarian cancer, uterine carcinosarcoma, squamous esophageal cancer, squamous non-small cell lung carcinoma (NSCLC), rectal adenocarcinoma, and in general tumors with known tumor protein 53 (TP53) gene mutations. For any of these preferred indications, participants should have exhausted standard therapeutic options with a proven survival benefit.
• Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1.
• Recovered to Grade 1 or baseline from all toxic effects of previous therapy (except alopecia or neuropathy).
• Suitable venous access for the study-required blood sampling including PK and pharmacodynamic sampling.
• Must have a radiographically or clinically evaluable tumor, but measurable disease as defined by RECIST v1.1 is not required for participation in this study.

Exclusion criteria

• Participants who require continuous use of proton pump inhibitors (PPIs) or histamine-2 (H2) receptor antagonists and participants who are taking PPIs within 5 days before the first dose of study drug.
• Treatment with clinically significant enzyme inducers, such as phenytoin, carbamazepine, enzalutamide, mitotane, ritonavir, rifampin, or St John's wort within 14 days before the first dose of study drug.
• With treated brain metastases are eligible if there is no evidence of progression for at least 4 weeks after central nervous system-directed treatment, as ascertained by clinical examination and brain imaging (magnetic resonance imaging [MRI] or CT) during the screening period.
• Part 2 only: known hypersensitivity to PPIs (example, angioedema or anaphylaxis have occurred).
• Part 2 only: not being able or willing to take one high fat breakfast as indicated in the protocol.