A Study of ADRX-0706 in Select Advanced Solid Tumors

Inclusion Criteria: * Phase 1a Dose Escalation: Subjects with histologically confirmed select advanced solid tumors, including urothelial carcinoma (UC), head and neck squamous cell carcinoma (HNSCC), breast cancer, cervical cancer, ovarian cancer, non-small cell lung cancer (NSCLC), and pancreatic cancer. Subjects must have received at least one prior systemic regimen and have no other therapy available known to provide meaningful clinical benefit in the opinion of the investigator. * Phase 1b Dose Expansion: Subjects with urothelial cancer, triple negative breast cancer or cervical cancer with disease progression after at least one prior systemic regimen and no standard treatment options available and considered appropriate in the opinion of the investigator, unless subject refuses standard therapy. * Measurable disease according to RECIST version 1.1 * Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 * Adequate hematologic, liver, and renal function Exclusion Criteria: * Active and uncontrolled central nervous system metastases * Significant cardiovascular disease * History of another malignancy other than the one for which the subject is being treated on this study within 3 years * Receipt of any anticancer or investigational therapy within 5 elimination half-lives or 14 days (whichever is less) * Any P-gp inducers/inhibitors or strong CYP3A inhibitors received within 14 days prior to the first dose of study drug * Receiving systemic antimicrobial treatment for active infection; routine antimicrobial prophylaxis is permitted