Status and phase
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About
Trial design:
Phase II, prospective, multi-center, randomized, open label, parallel group study in patients with HR-positive, HER2-negative locally advanced or metastatic breast cancer with g/tBRCA1/2 or g/tPALB2 mutation, with 2:1 randomization into Arm A (niraparib + elacestrant) or arm B (niraparib). Treatment in either arm will be given until disease progression, unacceptable toxicity, withdrawal of patient´s consent to study participation, or end of study.
Trial population:
Patients with HR-positive, HER2-negative locally advanced or metastatic breast cancer with g/tBRCA1/2 or g/tPALB2 mutation, having received at least one prior line of chemotherapy or endocrine-based therapy for irresectable, locally advanced, or metastatic disease (or adjuvant treatment with CDK4/6 inhibitor therapy), with ECOG performance status of 0-2 and life expectancy of > 6 months, with normal bone marrow and kidney functions and no active or newly diagnosed central nervous system (CNS) metastases or symptomatic metastatic visceral disease at risk of life-threatening complications.
Interventions:
Patients randomized to Arm A will receive 200mg niraparib daily and 400mg elacestrant daily, while patients randomized to Arm B will receive 200mg niraparib daily. Blood tests (hematology, biochemistry) will be performed at the beginning of every cycle, and imaging for tumor assessment (chest and abdominopelvic imaging) as well as QoL assessments will be performed every three months and in case of suspicion of progression/end of study.
Full description
Patients with HR-positive, HER2-negative advanced or metastatic breast cancer and g/tBRCA1/2 and/or g/tPALB2 mutations have a low progression-free survival (PFS) and represent a patient population with a high unmet need, hence further treatment options should be explored to improve patient outcomes.
Elacestrant is a novel, nonsteroidal, orally bioavailable estrogen receptor antagonist (SERD) that has shown efficacy in heavily pretreated patients with HR-positive, HER2-negative breast cancer, and in those with ESR1 mutations known to confer endocrine resistance, and has thus gained approval in 2023 by the Food and Drug Administration (FDA) and the European Medicines Agency (EMA) for postmenopausal women or adult men with ER-positive, HER2-negative, ESR1-mutated advanced or metastatic breast cancer with disease progression following at least one line of ET.
Niraparib is a poly-adenosine diphosphate ribose polymerase (PARP) inhibitor that has shown promise in patients with gBRCA mutated, HER2-negative locally advanced or metastatic breast cancer, previously treated with ≤2 prior lines of chemotherapy, as well as in patients with platinum-sensitive, recurrent ovarian cancer, regardless of the presence or absence of gBRCA1/2 mutations, with moderate bone marrow toxicity.
The purpose of the proposed study is to investigate if the addition of elacestrant to niraparib could potentially lead to an improvement in PFS compared to niraparib alone in patients with HR-positive, HER2-negative locally advanced or metastatic breast cancer with g/tBRCA1/2 and/or g/tPALB2 mutations.
ELEMENT is a phase II, prospective, multi-center, randomized, open label, parallel group study in patients with HR-positive, HER2-negative locally advanced or metastatic breast cancer with g/tBRCA1/2 or g/tPALB2 mutation, with 2:1 randomization into Arm A (niraparib + elacestrant) or arm B (niraparib). Treatment in either arm will be given until disease progression, unacceptable toxicity, withdrawal of patient´s consent to study participation, or end of study.
Enrollment
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Volunteers
Inclusion criteria
Patients will be eligible for study participation only if they comply with the following criteria:
Exclusion criteria
Patients will be ineligible for study participation if they fulfill any of the following criteria:
Known hypersensitivity reaction to one of the compounds, excipients, or substances used in this protocol.
Active or newly diagnosed CNS metastases, including leptomeningeal carcinomatosis, carcinomatous meningitis, or radiographic signs of CNS hemorrhage. Note: Patients with stable brain metastases are allowed. Radiotherapeutic treatment must be completed 1 week before planned day 1 of study therapy.
Presence of symptomatic metastatic visceral disease that are at risk of life-threatening complications in the short term, including but not confined to massive uncontrolled effusions (peritoneal, pleural, pericardial), pulmonary lymphangitis, or fulminant liver involvement.
Inadequate organ function prior to enrolment including:
Existing contraindication against the use of the elacestrant or niraparib.
Prior treatment with PARP inhibitors.
Female patients: pregnancy or lactation at the time of randomization or intention to become pregnant during the study and for a predefined period after the end of treatment (as described in protocol). Male patients: intention to get a child during the study and for a predefined period after the end of treatment (as described in protocol). According to the treatment received during the study, required contraception timelines for female and male patient after the end of therapy differ (refer to the study protocol).
Any of the following within 6 months prior to enrolment: myocardial infarction, severe/unstable angina, ongoing grade ≥ 2 cardiac dysrhythmias, prolonged QT corrected by Fridericia's formula (QTcF) grade ≥ 2, uncontrolled atrial fibrillation of any grade, coronary/peripheral artery bypass graft, heart failure of New York Heart Association (NYHA) Class II or greater, or cerebrovascular accident including transient ischemic attack.
Uncontrolled hypertension at the time of screening (systolic BP > 140 mmHg or diastolic BP > 90 mmHg that has not been adequately treated or controlled).
Active and current anticoagulation for treatment purposes of thrombotic events occurring <6 months before enrolment is not allowed (prophylactic anticoagulation, however, is acceptable). Treatment with an anticoagulant for a thrombotic event occurring > 6 months before enrolment, or for an otherwise stable and allowed medical condition (e.g., well controlled atrial fibrillation) is acceptable, provided dose and coagulation parameters (as defined by local standard of care) are stable for at least 28 days prior to the first dose of study drug.
Known difficulty in tolerating oral medications or conditions which would impair absorption of oral medications such as: uncontrolled nausea or vomiting (i.e., CTCAE ≥ grade 3 despite antiemetic therapy), ongoing gastrointestinal obstruction/motility disorder, malabsorption syndrome, or prior gastric bypass.
History of endometrial intraepithelial neoplasia in patients who have not undergone a hysterectomy.
Malignant disease other than breast cancer, active or being disease-free for less than 5 years (except carcinoma in situ of the cervix, DCIS, and non-melanomatous skin cancer adequately treated).
Any known history of myelodysplastic syndrome (MDS) or a pretreatment cytogenetic testing result at risk for a diagnosis of MDS/acute myeloid leukemia (AML).
Increased bleeding risk due to concurrent conditions (e.g., major injuries or major surgery within the past 28 days before start of study treatment).
Received a transfusion (platelets or red blood cells) within 4 weeks before the first dose of study treatment.
Received radiotherapy encompassing > 20% of the bone marrow within 2 weeks, or any radiation therapy (including radiation therapy for CNS metastases) within 1 week before planned day 1 of study therapy.
Uncontrolled significant active infections including HBV, HCV, and/or HIV. Patients with a positive hepatitis B surface antigen result or a positive hepatitis C antibody test result at screening or within 3 months before first dose of study treatment are excluded, except for the following:
Current active pneumonitis or any history of pneumonitis requiring steroids (any dose) or immunomodulatory treatment within 90 days of planned start of the study.
Any severe, acute, uncontrolled, or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with study participation or investigational or non-investigational products administration, or may interfere with the interpretation of study results, and, in the judgment of the investigator, would make the patient inappropriate for entry into this study.
History of significant neurological or psychiatric disorders including psychotic disorders, dementia, or seizures that would prohibit the understanding and giving of informed consent. Also, prior history of posterior reversible encephalopathy syndrome (PRES) excludes patients from this study.
Unable or unwilling to avoid medications, supplements (e.g., St. John's wort), or foods (e.g., grapefruit, pomegranate, pomelos, star fruit, Seville oranges and their juices) that are moderate/strong inhibitors or inducers of CYP3A4 activity. Participation will be allowed if the medication, supplements, or foods are discontinued for at least 14 days prior to study entry and for the duration of the study.
Concurrent treatment with other experimental drugs. Participation in another clinical trial with any investigational not marketed drug within 30 days prior to study entry.
Receipt of live attenuated vaccination within 30 days prior to study entry. COVID-19 vaccines that do not contain live viruses are allowed (at least one week prior to study entry).
Primary purpose
Allocation
Interventional model
Masking
176 participants in 2 patient groups
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Central trial contact
Stefan Schoeffel; Nader Hirmas, MD/PhD
Data sourced from clinicaltrials.gov
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