Gedatolisib Plus Talazoparib in Advanced Triple Negative or BRCA1/2 Positive, HER2 Negative Breast Cancers

  • End date
    Dec 26, 2023
  • participants needed
  • sponsor
    Kari Wisinski
Updated on 26 March 2022
measurable disease
breast cancer
brain metastases
parp inhibitor


This study is designed to determine the RP2D of gedatolisib in combination with talazoparib and to evaluate the efficacy of this combination in advanced HER2 negative breast cancer that is triple negative or BRCA1/2 positive (deficient).


Triple negative breast cancers (TNBC) are tumors that lack the hormone receptors and the human epidermal growth factor receptor-2 (HER2). TNBC represents about 15% of all invasive breast cancers diagnosed in the United States each year. This aggressive breast cancer subtype has the lowest overall survival rate of all advanced breast cancers with median survival of 12-13 months. Due to the lack of expression of the hormone receptors and HER2,chemotherapy remains the current treatment for women with advanced TNBC.

A subset of breast cancers have defects in homologous recombination (HR) DNA repair due to germline BRCA mutations, and these cases are often triple negative. Poly(ADP-ribose) polymerase (PARP) enzymes are involved in DNA repair and are activated by DNA strand breaks. PARP function is particularly critical in tumors with BRCA1/2 mutations, making PARP inhibition a rationale therapeutic strategy.

Two PARP inhibitors, Talazoparib and Olaparib, were approved by the FDA in 2018 for patients who have advanced HER2 negative breast cancer and a germline BRCA 1/2 mutation. These approvals were based on results from the EMBRACA and OLYMPIAD trials, respectively, which both showed an improvement in progression-free survival (PFS) versus physician choice chemotherapy.

Gedatolisib is an intravenously administered PI3K and mTOR inhibitor which has been shown to be safe in patients with metastatic breast cancer, either alone or in combination with oral therapies. Previous research has shown that PI3K inhibitors lower nucleotide pools required for DNA synthesis and S-phase progression. Additionally, inhibition of PI3K/mTOR could impede PI3K interaction with the homologous recombination complex, increasing dependency on PARP enzymes for DNA repair. Based on this data, the combination of a PI3K inhibitor and PARP inhibitor could potentially lead to a new, non-chemotherapy treatment option for TNBC with wild-type BRCA and improve the modest PFS seen with the PARP inhibitors as single agents in BRCA1/2 mutant advanced breast cancer. The hypothesis for this trial is that the gedatolisib will sensitize advanced TNBC or BRCA1/2 mutant breast cancers to PARP inhibition with talazoparib. This study is thus designed to determine the recommended phase 2 dose of gedatolisib in combination with talazoparib and to evaluate the efficacy of this combination in advanced HER2 negative breast cancer that is triple negative or BRCA1/2 positive (mutated/deficient).

Condition TNBC - Triple-Negative Breast Cancer
Treatment Talazoparib, Gedatolisib
Clinical Study IdentifierNCT03911973
SponsorKari Wisinski
Last Modified on26 March 2022


Yes No Not Sure

Inclusion Criteria

Male or female ≥ 18 years of age at time of consent
Subjects with histologically confirmed breast cancer that is advanced (defined as metastatic or unresectable)
Phase II Cohort A: Patients with advanced triple negative breast cancer (TNBC) with negative or unknown germline BRCA status. Variants of undetermined significance in BRCA 1/2 should be considered negative
Note: most recent tumor biopsy must be ER/PR negative or have ER and PR <10% and all prior biopsies of metastatic sites cannot have ever had ER or PR ≥20%
Phase I run-in: meets criteria for either cohort A or B
Note: HER2 is considered negative if ISH negative by ASCO/CAP guidelines or HER2+ 0 or 1+ on IHC or 2+ with negative ISH
Phase II Cohort B: Patients with advanced HER2 negative breast cancer and a
Prior therapy
germline BRCA1 or 2 (1/2) mutation
\---Note: HER2 is considered negative if ISH negative by ASCO/CAP guidelines
or HER2+ 0 or 1+ on IHC or 2+ with negative ISH
Cohort B: No more than 2 lines of prior chemotherapy for advanced disease are allowed. No limit on prior endocrine or targeted therapies
Phase I run-in: Measurable or evaluable (non-measurable) disease (see section 9.2 for more detail)
Both cohorts: no prior PARP inhibitor for advanced breast cancer
Phase II: Measurable disease by RECIST 1.1 is required
Life expectancy of 12 weeks or greater as determined by the treating physician
Demonstrate adequate organ function as defined in the table in the protocol; all screening labs to be obtained within 28 days prior to registration
Archived tumor tissue available (Metastatic disease from non-bone and non-brain sites preferred, but primary breast or lymph node tissue is permitted. Confirmation of available tissue only- tumor samples do not need to be shipped for eligibility purposes. Tumor samples do not need to be shipped until subject is confirmed eligible and is registered for treatment
Cohort A: At least one line of prior systemic therapy for advanced breast cancer
Ability to take oral medications
(chemotherapy or other targeted therapy allowed). No more than 3 lines of
No history of type I diabetes. For patients with known type II diabetes, must have controlled diabetes (Hgb A1c < 7.0 mmol/L within 30 days of study entry) with no more than one oral anti-diabetic agent and no insulin
prior chemotherapy for advanced disease are allowed. No limit on prior
No active central nervous system (CNS) metastatic disease. NOTE: Subjects with CNS involvement must meet ALL of the following to be eligible
endocrine or targeted therapies
At least 28 days from prior definitive treatment of their CNS disease by surgical resection, SBRT or WBRT at the time of registration
Asymptomatic and off systemic corticosteroids and/or enzyme-inducing antiepileptic medications for brain metastases for >14 days prior to registration
Has an Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2
NOTE: HIPAA authorization may be included in the informed consent or obtained separately
within 28 days prior to study registration
Women of childbearing potential (WOCP) must not be pregnant or breast-feeding. A negative serum or urine pregnancy test is required within 14 days of study registration. If the urine test cannot be confirmed as negative, a serum pregnancy test will be required
Women of childbearing potential (WOCP) must be willing to use two effective methods of birth control such as an oral, implantable, injectable, or transdermal hormonal contraceptive, an intrauterine device (IUD), use of a double barrier method (condoms, sponge, diaphragm, or vaginal ring with spermicidal jellies or cream), vasectomized partner, or total abstinence for the course of the study until 7 months after the last dose of study drug
Men who are not surgically sterile (vasectomy) must agree to use an acceptable method of contraception. Male subjects with female sexual partners who are pregnant, possibly pregnant, or who could become pregnant during the study must agree to use condoms from the first dose of study drug through at least 4 months after the last dose of study drug. Total abstinence for the same time period is an acceptable alternative
As determined by the enrolling physician or protocol designee, ability of the subject to understand and comply with study procedures for the entire length of the study
Provided written informed consent and HIPAA authorization for release of personal
health information, approved by an Institutional Review Board (IRB)
NOTE; Women are considered to be of childbearing potential unless they are postmenopausal (≥45 years of age and has not had menses for greater than 12 consecutive months) or bilateral oophorectomy or surgically sterile (bilateral tubal ligation or hysterectomy) or not heterosexually active for the duration of the study and willing to continue for at least 7 months after the last dose of study drug

Exclusion Criteria

Pregnant or breastfeeding (NOTE: breast milk cannot be stored for future use while the mother is being treated on study)
Treatment with any investigational drug within 14 days prior to registration or within 5 half-lives of the investigational product, whichever is longer
Subject has had major surgery within 14 days prior to registration or has not recovered from major side effects of the surgery (tumor biopsy is not considered as major surgery)
Any prior or concurrent malignancy whose natural history or treatment has the potential to interfere with the safety or efficacy assessment of this investigational regimen
Known hypersensitivity to any of the excipients of gedatolisib or talazoparib
Any impairment of gastrointestinal (GI) function or GI disease that may significantly alter the absorption of talazoparib (e.g., ulcerative diseases, uncontrolled nausea, vomiting, diarrhea, malabsorption syndrome, or small bowel resection)
Known active hepatitis B or C (testing not mandatory). Patients who have completed curative therapy for HCV are eligible
Known history of myelodysplastic syndrome or acute myeloid leukemia
Subjects with any of the following conditions
History of drug-induced pneumonitis within last 12 months or any history of pneumonitis related to an mTOR inhibitor or current clinically significant pulmonary disease not due to the breast cancer
Active infection requiring systemic therapy. Patients with a known history of HIV must have a CD4 count ≥ the institutional lower limit of normal within 28 days prior to registration. Patients with HIV must also be on a stable anti-retroviral regimen for ≥ 28 days before registration
History of abdominal fistula, gastrointestinal perforation, or intra- abdominal abscess within 28 days prior to registration
Any history of cerebrovascular accident (CVA) or transient ischemic attack within 12 months prior to registration
Patients who have had chemotherapy, targeted therapy, or radiotherapy within 2 weeks (6 weeks for nitrosoureas or mitomycin C) prior to entering the study or those who have not recovered from acute effects of any prior therapy to baseline or Grade ≤1. Grade 2 or higher exceptions include alopecia, up to grade 2 neuropathy or other Grade 2 AEs or lab values not constituting a safety risk in the opinion of the treating physician
History of acute coronary syndromes (including myocardial infarction, unstable angina, coronary artery bypass grafting, coronary angioplasty, or stenting) or symptomatic pericarditis within 6 months prior to registration
Symptomatic congestive heart failure (New York Heart Association III-IV) or documented current cardiomyopathy with left ventricular ejection fraction (LVEF) <50%
Clinically significant cardiac ventricular arrhythmias (e.g. sustained ventricular tachycardia/ventricular fibrillation) or high-grade AV block (e.g. bifascicular block, Mobitz type II and third-degree AV block) unless a pacemaker is in place
Long QT syndrome or family history of idiopathic sudden death or congenital long QT syndrome
Any concurrent severe and/or uncontrolled medical condition that would, in the investigator's judgment, cause unacceptable safety risks, contraindicate subject participation in the clinical study or compromise compliance with the protocol
Subject is currently receiving warfarin or other coumarin-derived anticoagulant for treatment, prophylaxis or otherwise. Therapy with heparin, low molecular weight heparin (LMWH), direct thrombin inhibitors (such as dabigatran) or novel oral anticoagulants (such as rivaroxaban or apixaban) are allowed as long as the patient has been on this therapy for at least 14 days with no clinically significant bleeding
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