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NCT Number: NCT05378204

Study Evaluating DNA Double-strand Breaks (DSBs) REpair Factors (POLQ, Shieldin Complex and 53BP1) Expression as Biomarker of PARP Inhibitor Resistance in Patients With Deleterious Germline Mutation in BRCA 1/2 and HER2-negative, Metastatic or Locally Advanced Breast Cancer.

The purpose of this study is to assess whether expression of not only POLQ/Polθ, but also Shieldin complex and/or 53BP1 are correlated with primary and/or acquired resistance to PARPi (Poly(ADP-Ribose) Polymerases inhibitors) in a sub-population of locally advanced or metastatic breast cancer patients and vary regarding type and location of gBRCA1/2 mutations.

This translational research program is composed of two multicentric, non-randomized prospective studies in patients with HER2-negative locally advanced or metastatic breast cancer:

* The main study concerns 80 patients eligible for PARPi (according to the investigators).PARPi treatments (talazoparib or olaparib) will be administered and dosed according to the standard of care administration. * The sub-study concerns 40 patients in progression disease under PARPi alone.

For each included patient in the main study or sub-study, tumor biopsy specimen and blood samples will be collected at different times during the study.

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Key information

Conditions

Breast Cancer Breast Diseases Breast Neoplasms Neoplasms Neoplasms by Site Skin Diseases Skin and Connective Tissue Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Institut Bergonie, Bordeaux, France

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

MAIN STUDY

Inclusion criteria

  • Women (or men) aged ≥ 18 years with histologically proven breast cancer
  • Metastatic relapse or locally advanced breast cancer
  • No-HER2 overexpression or amplification
  • Triple-negative (defines as ER<1%, PR<1% and HER2-negative as per ASCO CAP guidelines) or hormone receptor positive (defines as ER and/or PR ≥ 1%) breast cancer
  • Patients with metastases that can be biopsied except bone metastases. At baseline, if patients already have an archived biopsy from a secondary or a primary site (if stage IV) of their current disease, this material can be used for the study, provided that, it was collected within 3 months prior enrollment and a frozen and a FFPE sample are both available for research
  • ECOG Performance Status ≤ 2
  • Patients must have measurable or evaluable disease according to RECIST v1.1
  • Patient with deleterious germline BRCA 1 and/or 2 mutation, eligible for PARP inhibitor therapy (olaparib or talazoparib), according each investigator
  • Any number of prior lines therapy are allowed
  • Current treatment with PARP inhibitor not yet started
  • Women should be post-menopaused or willing to accept the use of an effective contraceptive regimen during the treatment period by PARP inhibitor
  • Patient able to participate and willing to give informed consent prior performance of any study-related procedures and to comply with the study protocol
  • Patient affiliated to a Social Health Insurance in France

NON-INCLUSION CRITERIA:

  • Abnormal coagulation contraindicating biopsy
  • Bone metastases when this is the only site of biopsiable disease
  • Patients with all target in a previously irradiated region, except if clear progression has been observed prior to study in at least one of them
  • Patients with known additional malignancy that is progressing or requires active treatment. Exceptions include basal cell carcinoma of the skin or squamous cell carcinoma of the skin that has undergone potentially curative therapy or in situ cervical cancer
  • Patients with known untreated CNS metastases and/or carcinomatous meningitis
  • Patients with a known history of Human Immunodeficiency Virus (HIV)
  • Patients with known active Hepatitis B or C
  • Patients should not be on any other anti-cancer therapy (chemotherapy, endocrine therapy, immunotherapy, tailored therapy or alternative investigational therapy)
  • Patient pregnant, or breast-feeding
  • Any psychological, familial, geographic or social situation, according to the judgment of investigator, potentially preventing the provision of informed consent or compliance to study procedure
  • Patient who has forfeited his/her freedom by administrative or legal award or who is under legal protection (curatorship and guardianship, protection of justice)

SUB-STUDY

Inclusion criteria

  • Women (or men) aged ≥ 18 years with histologically proven breast cancer
  • Metastatic relapse or locally advanced breast cancer
  • No-HER2 overexpression or amplification
  • Triple-negative (defines as ER<1%, PR<1% and HER2-negative as per ASCO CAP guidelines) or hormone receptor positive (defines as ER and or PR ≥ 1%) breast cancer
  • Patients with metastases that can be biopsied except bone metastases
  • ECOG Performance Status ≤ 2
  • Patients, with deleterious germline BRCA 1 and/or 2, in progression under PARPi alone (talazoparib or olaparib)
  • Patient able to participate and willing to give informed consent prior performance of any study-related procedures and to comply with the study protocol
  • Patient affiliated to a Social Health Insurance in France

NON-INCLUSION CRITERIA:

  • Abnormal coagulation contraindicating biopsy
  • Bone metastases when this is the only site of biopsiable disease
  • Patient pregnant, or breast-feeding
  • Patients with a known history of Human Immunodeficiency Virus (HIV)
  • Patients with known active Hepatitis B or C
  • Any psychological, familial, geographic or social situation, according to the judgment of investigator, potentially preventing the provision of informed consent or compliance to study procedure
  • Patients already participating in the main REPARP study
  • Patient who has forfeited his/her freedom by administrative or legal award or who is under legal protection (curatorship and guardianship, protection of justice)

Treatment and study plan

Main study:

Other

For each included patient, tumor biopsy specimen and blood samples will be collected at baseline visit (before the first dose of PARPi treatment).

During the treatment period: blood samples will be scheduled every 8 weeks (i.e. 2 cycles).

At the time of progression: tumor biopsy and blood samples will be collected.

Sub-study:

Other

For each included patient, tumor biopsy specimen and blood samples will be collected as soon as possible after progression (before initiation of the post PARPi anti-tumoral treatment).

Primary outcomes

  1. Main study: the primary endpoint is the Area under the Receiver Operating Characteristic Curve (ROC Curve) of POLQ expression to identify patients presenting progressive disease or death at 6 months under PARPi alone (primary resistance).

    Time frame: 6 months for each patient

    Progression will be determined using RECIST v1.1 criteria.

  2. Sub-study: the primary end point is the rate of patients presenting loss of Shieldin complex and/or 53BP1.

    Time frame: 1 month for each patient

Secondary outcomes

  1. Main study: Progression-Free Survival defined as the time from inclusion until progression according to RECIST v1.1 criteria or death from any cause, whichever occurs first.

    Time frame: 12 months for each patient

  2. Main study: Objective Response (i.e. complete or partial response) defined using RECIST v1.1 criteria.

    Time frame: 12 months for each patient

  3. Main study: Duration Of Response defined as the time from initial objective response until progression according to RECIST v1.1 criteria or death from any cause.

    Time frame: 12 months for each patient

  4. Sub-study: expression of the Shieldin complex and 53BP1.

    Time frame: 1 month for each patient

Study contacts

Contact information is provided by the study sponsor or research team.

Florence DALENC

CONTACT

[email protected]

05 31 15 51 04

Sponsors and collaborators

Lead sponsor

Institut Claudius Regaud

Other

Registry information

Official study title

Prospective and Multicentric Study Evaluating DNA Double-strand Breaks (DSBs) REpair Factors (POLQ, Shieldin Complex and 53BP1) Expression as Biomarker of PARP Inhibitor Resistance in Patients With Deleterious Germline Mutation in BRCA 1/2 and HER2-negative, Metastatic or Locally Advanced Breast Cancer.

Acronym: REPARP

Important dates

Study start
2022
Primary completion
2027
Study completion
2027
First posted
May 18, 2022
Registry last updated
Feb 20, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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