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Study of RP-3500 in Advanced Solid Tumors

Trial Status: Active

The primary purpose of this study is to study the maximum tolerated dose (MTD) of orally-administered RP-3500 alone or in combination with talazoparib, a PARP inhibitor, in patients with advanced solid tumors with ATR inhibitor-sensitizing mutations. This study will also evaluate the safety and tolerability of RP-3500 alone or in combination with talazoparib, examine both the pharmacokinetics (PK)and pharmacodynamics (PD)and investigate its anti-tumor activity in solid tumors.

Inclusion Criteria

  • Written informed consent, according to local guidelines, signed and dated by the patient or legal guardian prior to the performance of any study-specific procedures, sampling, or analyses.
  • Male or female and ≥18 years-of-age at the time of signature of the ICF.
  • Eastern Cooperative Oncology Group (ECOG) Performance Status score of 0 or 1.
  • Histologically confirmed solid tumors resistant or refractory to standard treatment and/or patients who are intolerant to standard therapy.
  • Measurable disease as per RECIST v1.1
  • Existing biomarker profile (tumor tissue or plasma) reported from a local test obtained in a certified lab per institutional guidelines:
  • Available tumor tissue or willingness to have a biopsy performed to obtain tissue.
  • Ability to comply with the protocol and study procedures detailed in the Schedule of Assessments.
  • Ability to swallow and retain oral medications.
  • Acceptable organ function at screening
  • Acceptable blood counts at screening
  • Negative pregnancy test (serum or urine) for women of childbearing potential at Screening and prior to first study drug. Women who are not of childbearing potential is defined as 1) adequate time with absence of menses (period) or 2) documented infertility.
  • Resolution of all toxicities of prior treatment or surgery.
  • Male patients with female partners of childbearing potential and women of childbearing potential must follow a contraception method (oral contraceptives allowed) during their participation in the study and for at least 4 months following last dose of study drug. Male patients must also refrain from donating sperm during their participation in the study and for 4 months following last dose of study drug.

Exclusion Criteria

  • Chemotherapy, small molecule anticancer or biologic anticancer therapy given within 14 days prior to first dose of study drug.
  • History or current condition (such as transfusion dependent anemia or thrombocytopenia), therapy, or laboratory abnormality that might confound the study results, or interfere with the patient's participation for the full duration of the study treatment.
  • Prior therapy with an ATR or DNA-dependent protein kinase (DNA-PK) inhibitor.
  • Known hypersensitivity to any of the ingredients of RP-3500.
  • Life-threatening illness, medical condition, active uncontrolled infection, or organ system dysfunction or other reasons which, in the investigator's opinion, could compromise the patient's safety.
  • Uncontrolled, symptomatic brain metastases.
  • Uncontrolled high blood pressure
  • Patients with active, uncontrolled bacterial, fungal, or viral infection, including hepatitis B virus (HBV), hepatitis C virus (HCV), known human immunodeficiency virus (HIV) or acquired immunodeficiency syndrome (AIDS) related illness.
  • Moderate or severe hepatic impairment (ie, Child-Pugh class B or C).
  • History or presence of an abnormal ECG that is clinically significant in the investigator's opinion.
  • History of ventricular dysrhythmias or risk factors such as structural heart disease, coronary heart disease (clinically significant electrolyte abnormalities or family history of sudden unexplained death or long QT syndrome
  • Current treatment with medications that are well-known to prolong the QT interval
  • History of myelodysplastic syndrome (MDS) or acute myeloid leukemia (AML) diagnosis


Brigham and Women's Hospital
Status: ACTIVE
Dana-Farber Cancer Institute
Status: ACTIVE

New York

New York
Memorial Sloan Kettering Cancer Center
Status: ACTIVE
Contact: Ezra Rosen
Phone: 212-639-2000

North Carolina

Duke University Medical Center
Status: ACTIVE


M D Anderson Cancer Center
Status: ACTIVE
Contact: Sandra Montez
Phone: 713-745-6274

This is a first-in-human, Phase 1/2, multi-center, open-label, dose-escalation and expansion

study to:

- Evaluate the safety profile and MTD of RP-3500 when administered orally, alone and in

combination with talazoparib, to establish the dose and schedule recommended for the

Phase 2

- Characterize the PK profile of RP-3500 alone or in combination with talazoparib

- Identify anti-tumor activity associated with RP-3500 given alone or in combination with


- Examine biomarker responses and establish a correlation with RP-3500 treatment.

The initial cohorts will test RP-3500 as monotherapy. Additional cohorts will be enrolled

with RP-3500 in combination with a PARP inhibitor.

After the RP2D and schedule is determined, expansion cohort(s) for RP-3500 will be enrolled

to study the anti-tumor effect, and further examine the safety, PK, and PD of RP-3500 at the


Trial Phase Phase I/II

Trial Type Treatment

Lead Organization
Repare Therapeutics

  • Primary ID RP-3500-01
  • Secondary IDs NCI-2020-06869, 2020-000301-87
  • ID NCT04497116