Prevalence of Emerging Treatment-induced Mutations in Metastatic ER-positive Breast Cancer.

NCT ID: NCT06417801

Last Updated: 2025-11-17

Basic Information

• Recruitment Status: RECRUITING
• Total Enrollment: 70 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2024-06-17
• Study Completion Date: 2025-12-30

Brief Summary

Observational study on prevalence of emerging ESR1 mutations in liquid biopsy in two cohorts of patients with breast cancer (with and without prior therapies in metastatic setting) in comparison with patient's baseline ESR1 mutation status as defined by tissue profiling.

Detailed Description

This is a prospective observational biomarker cohort study. Biomarkers: GS Focus Liquid Breast (liquid biopsy sequencing assay, covers mutations in ESR1, PIK3CA, AKT1, PTEN, ERBB2, BRCA1, BRCA2, PALB2) and parallel GS Focus Breast (tissue sequencing assay performed in baseline tissue biopsy from primary tumor or metastatic lesion not exposed to any systemic therapy, cover same gene panel).

Biomarker assessment will be carried out by NGS methodology in both liquid biopsy and baseline tissue biopsy. Both strategies consider a custom panel covering PIK3CA, AKT1, PTEN, ESR1, BRCA1, BRCA2, PALB2, ERBB2 genes.

NGS panels were internally validated and presented sensitivity, specificity and accuracy of 100,00% with a limit of detection of 0,5% VAF for liquid biopsy panel and sensitivity, specificity and accuracy of 100,00% with a limit of detection of 5% VAF for tissue panel. Basically, DNA is extracted from tissue samples (FFPE) and plasma using QIASymphony extractions kits. An input of 10 and 100 ng is required for liquid biopsy and tissue respectively. NGS libraries is prepared using QIAseq Targeted DNA Custom Panel (QIAGEN). Sequencing is performed in Illumina platform (NextSeq for liquid biopsy and MiSeq for tissue samples) in paired-end 2x 150 cycles.

Conditions

Metastatic Breast Cancer

Study Design

• Observational Model Type: COHORT
• Study Time Perspective: PROSPECTIVE

Study Groups

Cohort 1 (N=30)

Locally-advanced/metastatic HR+/HER2- breast cancer, either treatment naive or previously exposed to adjuvant therapies, no prior palliative therapy, candidates to receive first-line hormone therapy, primary tumor tissue available.

No interventions assigned to this group

Cohot 2 (N=40)

Locally-advanced/metastatic HR+/HER2- breast cancer, progression during hormone therapy plus CDK inhibitor; primary tumor tissue available.

No interventions assigned to this group

Eligibility Criteria

Inclusion Criteria

Cohort 1:

• BC patients, male and female, 18 years old and older, pre or post menopausal, with HR+ (ER and/or PR positive), Her-2 negative (confirmed centrally) locally advanced irresectable and/or metastatic disease
• Confirmation of HR and Her-2 status may be performed in the primary tumor or in the metastatic lesion (patients with discordant results may be included)
• Patients must be candidates to CDK4/6i therapy in combination with endocrine therapy in the first line setting (with or without ovarian suppression)
• Patients may have received one previous line of chemotherapy in the metastatic setting, but no endocrine therapy in the metastatic setting is allowed
• Patients may have received chemotherapy in the neo/adjuvant setting
• Patients may have received endocrine therapy (with or without ovarian suppression) in the neo/adjuvant setting
• Patients may have received a CDK4/6i in the adjuvant setting, provided they are still candidates for CDK4/6i therapy in the metastatic setting
• Patients must be able to undergo a liquid biopsy procedure before starting their first line treatment
• All patients must fill and sign an informed consent form.

Cohort 2:

• BC patients, male and felame, 18 years old and older, pre or post menopausal, with HR+ (ER and/or PR positive), Her-2 negative (confirmed centrally) locally advanced irresectable and/or metastatic disease who have progressed on a CDK4/6i in combination with endocrine therapy (with or without ovarian suppression) in the first or second line setting

Exclusion Criteria

Patients with HR+ (ER and/or PR positive) and Her-2 negative disease NOT confirmed centrally

• Patients with NO radiologic and/or pathologic confirmed locally irresectable and/or metastatic breast cancer
• Patients who are NOT candidates for further systemic treatment after diagnosis of metastatic disease or disease progression
• Patients who have already started a CDK4/6i in combination with endocrine therapy (with or without ovarian suppression) for metastatic disease in the first line setting (for cohort 1); and patients who have already started a new line of treatment for metastatic disease after disease progression on a CDK4/6i in combination with endocrine therapy (with or without ovarian suppression)(for cohort 2)
• Patients who are NOT able to undergo a liquid biopsy procedure
• Patients who are NOT able to provide informed consent.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 100 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

AstraZeneca

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Rodrigo Dienstmann

Role: PRINCIPAL_INVESTIGATOR

Oncoclínicas

Locations

Research Site

São Paulo, São Paulo, Brazil

Site Status: RECRUITING

Countries

Brazil

Central Contacts

AstraZeneca Clinical Study Information Center

Role: CONTACT

information.center@astrazeneca.com

1-877-240-9479

Other Identifiers

D3612L00003

Identifier Type: -

Identifier Source: org_study_id