Metastatic Breast Cancer Clinical Trial
Official title:
PANGEIA-2: Prevalence of Emerging Treatment-induced Mutations in metastaticER Positive Breast Cancer.
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.
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. ;
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