A Study of ZN-c3 in Participants With Solid Tumors

Inclusion Criteria

• Subjects must have a solid tumor with advanced or metastatic disease, refractory to standard therapy or for whom no standard therapy is available, or the subject is ineligible for standard therapy(ies).
• Measurable or evaluable disease per RECIST version 1.1. Food Effect Cohort Inclusion Criteria:
• Subjects with solid tumors with advanced or metastatic disease who are refractory or ineligible to standard therapy(ies) or for whom no standard therapy is available.
• Subjects must have no relevant dietary restrictions, and be willing to consume a high-calorie, high-fat breakfast and other standard meals provided during the study. Dose Expansion Inclusion Criteria:
• Measurable disease, defined as at least one lesion that can be accurately measured per RECIST version 1.1 criteria.
• Recurrent or persistent USC or locally advanced or metastatic malignancy with one or more relevant biomarkers related to deoxyribonucleic acid (DNA) damage pathways. Major

Exclusion Criteria

• Prior therapy with ZN-c3 or known hypersensitivity to any drugs similar to ZN-c3 in class or any inactive ingredients present in ZN-c3.
• Prior therapy with a WEE1 inhibitor.
• A serious illness or medical condition(s).
• Unresolved toxicity of Grade >1 attributed to any prior therapies (excluding Grade ≤2 neuropathy, alopecia or skin pigmentation).
• Pregnant or lactating females (including the cessation of lactation) or females of childbearing potential who have a positive serum pregnancy test within 14 days prior to C1D1.
• Subjects with active (uncontrolled, metastatic) second malignancies or requiring therapy.
• 12-lead ECG demonstrating a corrected QT interval using Fridericia's formula (QTcF) of >480 ms, except for subjects with atrioventricular pacemakers or other conditions (e.g., right bundle branch block) that render the QT measurement invalid.
• History or current evidence of congenital or family history of long QT syndrome or Torsade de Pointes (TdP).