DOI: 10.1101/507608Jan 8, 2019Paper

A single droplet digital PCR for ESR1 activating mutations detection in plasma

BioRxiv : the Preprint Server for Biology
Emmanuelle JeannotCharlotte Proudhon

Abstract

Background: Activating mutations in the estrogen receptor 1 (ESR1) gene are recurrent mechanisms of acquired resistance to aromatase inhibitors (AI), and may be the target of other selective estrogen receptor down-regulators. To assess the clinical utility of monitoring ESR1-resistant mutations, a droplet digital PCR (ddPCR)-based assay compatible with body fluids is ideal due to its cost-effectiveness and quick turnaround. Methods: We designed a multiplex ddPCR, which combines a drop-off assay, targeting the clustered hotspot mutations found in exon 8, with another pair of probes interrogating the E380Q mutation in exon 5. We assessed its sensitivity in vitro using synthetic oligonucleotides, harboring E380Q, L536R, Y537C, Y537N, Y537S or D538G mutations. Validation of the assay was performed on plasma samples from a prospective study and compared to next generation sequencing (NGS) data. Results: The multiplex ESR1-ddPCR showed a high sensitivity with a limit of detection ranging from 0.07 to 0.19% in mutant allele frequency depending on the mutation tested. The screening of plasma samples from patients with AI-resistant metastatic breast cancer identified ESR1 mutations in 29% of them with perfect concordance (and higher sen...Continue Reading

Related Concepts

Body Fluids
Down-Regulation
Exons
Genes
Oligonucleotides
Plasma
Polymerase Chain Reaction
Estrogen Receptors
Tachycardia
Carcinoma Breast Stage IV

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