A First-in-human Study of PARP1 Selective Inhibitor, IMP1734, in Participants With Advanced Solid Tumors

Key Inclusion Criteria

* Breast cancer; must have received at least one prior chemotherapy in neoadjuvant/adjuvant/metastatic setting, must have received hormonal therapy if HR+,
* HGSOC or high grade endometrioid EOC, fallopian tube or primary peritoneal cancer; must have received at least one prior platinum-based chemotherapy for advanced disease
* mCRPC with ongoing ADT, must have received NHA and up to 1 prior line of taxane chemotherapy
* Age ≥ 18 years at the time of informed consent
* Eastern Cooperative Oncology Group (ECOG) performance status ≤1
* Adequate organ function
* Life expectancy ≥ 12 weeks
* Should have evaluable disease as defined by RECIST1.1 and/or CA125 or PSA
* Female subjects of childbearing potential and male subjects must agree to use an effective method of contraception from study entry up to 6 months after the last dose of IMP1734
* deleterious or suspected deleterious germline or somatic mutations of select HRR genes
* up to 1 prior line of PARP inhibitor containing treatment

Key Exclusion Criteria:

* Any investigational or approved anti-cancer therapies administered within 28 days/ before the first dose of IMP1734
* Have received prior PARP1 selective inhibitors
* Mean resting QTcF \> 470 ms or QTcF \< 340 ms
* Active or untreated central nervous system (CNS) metastases and/or carcinomatous meningitis.
* Infections

  \- An active hepatitis B/C infection
* Any known predisposition to bleeding
* Unable to swallow oral medications OR have malabsorption syndrome or any other uncontrolled gastrointestinal condition that might impair the bioavailability