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

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.

Eligibility

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
* All other non-conflicting inclusion criteria for cohort 1 apply.

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.

Conditions3

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