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Gezer U, Bronkhorst AJ, Holdenrieder S. The Clinical Utility of Droplet Digital PCR for Profiling Circulating Tumor DNA in Breast Cancer Patients. Diagnostics (Basel) 2022; 12:diagnostics12123042. [PMID: 36553049 PMCID: PMC9776872 DOI: 10.3390/diagnostics12123042] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 11/29/2022] [Accepted: 11/30/2022] [Indexed: 12/07/2022] Open
Abstract
Breast cancer is the most common cancer affecting women worldwide. It is a malignant and heterogeneous disease with distinct molecular subtypes, which has prognostic and predictive implications. Circulating tumor DNA (ctDNA), cell-free fragmented tumor-derived DNA in blood plasma, is an invaluable source of specific cancer-associated mutations and holds great promise for the development of minimally invasive diagnostic tests. Furthermore, serial monitoring of ctDNA over the course of systemic and targeted therapies not only allows unparalleled efficacy assessments but also enables the identification of patients who are at risk of progression or recurrence. Droplet digital PCR (ddPCR) is a powerful technique for the detection and monitoring of ctDNA. Due to its relatively high accuracy, sensitivity, reproducibility, and capacity for absolute quantification, it is increasingly used as a tool for managing cancer patients through liquid biopsies. In this review paper, we gauge the clinical utility of ddPCR as a technique for mutational profiling in breast cancer patients and focus on HER2, PIK3CA, ESR1, and TP53, which represent the most frequently mutated genes in breast cancers.
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Affiliation(s)
- Ugur Gezer
- Institute of Oncology, Department of Basic Oncology, Istanbul University, Istanbul 34093, Turkey
| | - Abel J. Bronkhorst
- Munich Biomarker Research Center, Institute of Laboratory Medicine, German Heart Center Munich Technical University Munich, 80636 München, Germany
| | - Stefan Holdenrieder
- Munich Biomarker Research Center, Institute of Laboratory Medicine, German Heart Center Munich Technical University Munich, 80636 München, Germany
- Correspondence:
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Allouchery V, Perdrix A, Calbrix C, Berghian A, Lequesne J, Fontanilles M, Leheurteur M, Etancelin P, Sarafan-Vasseur N, Di Fiore F, Clatot F. Circulating PIK3CA mutation detection at diagnosis in non-metastatic inflammatory breast cancer patients. Sci Rep 2021; 11:24041. [PMID: 34911971 PMCID: PMC8674263 DOI: 10.1038/s41598-021-02643-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 11/11/2021] [Indexed: 01/04/2023] Open
Abstract
Inflammatory breast cancer (IBC) is an aggressive BC subtype with poor outcomes. A targetable somatic PIK3CA mutation is reported in 30% of IBC, allowing for treatment by PI3Kα-specific inhibitors, such as alpelisib. The aim of this study was to evaluate the detection rate of circulating PIK3CA mutation in locally-advanced IBC (LAIBC) patients harbouring a PIK3CA mutation on initial biopsy. This monocentric retrospective study was based on available stored plasma samples and tumour biopsies at diagnosis from all LAIBC patients treated with neo-adjuvant chemotherapy (NCT) between 2008 and 2018 at the Centre Henri Becquerel. PIK3CA mutations (E542K, E545K, H1047R/L) were assessed by droplet digital PCR (ddPCR) in plasma samples and tumoral tissue at diagnosis. A total of 55 patients were included. Overall, 14/55 patients (25%) had a PIK3CA mutation identified on baseline biopsy (H1047R = 8; H1047L = 3; E545K = 2; E542K = 1). Among them, 11 (79%) patients had enough DNA for circulating DNA analyses, and corresponding circulating PIK3CA mutations were found in 6/11 (55%). Among the 41 patients without PIK3CA mutations on biopsy, 32 (78%) had enough DNA for circulating DNA analysis, and no circulating PIK3CA mutation was identified. Our results revealed no prognostic or predictive value of PIK3CA mutations at the diagnosis of non-metastatic IBC but highlighted the prognostic value of the cfDNA rate at diagnosis. Our study showed that a corresponding circulating PIK3CA mutation was identified in 55% of LAIBC patients with PIK3CA-mutated tumours, while no circulating mutation was found among patients with PI3KCA wild-type tumours.
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Affiliation(s)
- Violette Allouchery
- Department of Medical Oncology, Centre Henri Becquerel, 1 Rue d'Amiens, 76038, Rouen Cedex 1, France.
| | - Anne Perdrix
- IRON Group, Inserm U1245, UNIROUEN, Rouen University Hospital, Normandy Centre for Genomic and Personalized Medicine, Normandie Université, Rouen, France.,Department of Bio-Pathology, Centre Henri Becquerel, Rouen, France
| | - Céline Calbrix
- IRON Group, Inserm U1245, UNIROUEN, Rouen University Hospital, Normandy Centre for Genomic and Personalized Medicine, Normandie Université, Rouen, France.,Department of Bio-Pathology, Centre Henri Becquerel, Rouen, France
| | - Anca Berghian
- Department of Bio-Pathology, Centre Henri Becquerel, Rouen, France
| | - Justine Lequesne
- Department of Biostatistics, Rouen University Hospital, Rouen, France
| | - Maxime Fontanilles
- Department of Medical Oncology, Centre Henri Becquerel, 1 Rue d'Amiens, 76038, Rouen Cedex 1, France.,IRON Group, Inserm U1245, UNIROUEN, Rouen University Hospital, Normandy Centre for Genomic and Personalized Medicine, Normandie Université, Rouen, France
| | - Marianne Leheurteur
- Department of Medical Oncology, Centre Henri Becquerel, 1 Rue d'Amiens, 76038, Rouen Cedex 1, France
| | | | - Nasrin Sarafan-Vasseur
- IRON Group, Inserm U1245, UNIROUEN, Rouen University Hospital, Normandy Centre for Genomic and Personalized Medicine, Normandie Université, Rouen, France.,Department of Bio-Pathology, Centre Henri Becquerel, Rouen, France
| | - Frédéric Di Fiore
- Department of Medical Oncology, Centre Henri Becquerel, 1 Rue d'Amiens, 76038, Rouen Cedex 1, France.,IRON Group, Inserm U1245, UNIROUEN, Rouen University Hospital, Normandy Centre for Genomic and Personalized Medicine, Normandie Université, Rouen, France.,Department of Gastroenterology, Rouen University Hospital, Rouen, France
| | - Florian Clatot
- Department of Medical Oncology, Centre Henri Becquerel, 1 Rue d'Amiens, 76038, Rouen Cedex 1, France.,IRON Group, Inserm U1245, UNIROUEN, Rouen University Hospital, Normandy Centre for Genomic and Personalized Medicine, Normandie Université, Rouen, France
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Batalini F, Moulder SL, Winer EP, Rugo HS, Lin NU, Wulf GM. Response of Brain Metastases From PIK3CA-Mutant Breast Cancer to Alpelisib. JCO Precis Oncol 2020; 4:1900403. [PMID: 32923889 PMCID: PMC7446424 DOI: 10.1200/po.19.00403] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/22/2020] [Indexed: 12/17/2022] Open
Affiliation(s)
| | | | | | - Hope S Rugo
- University of California, San Francisco, San Francisco, CA
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