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RESEARCH PRODUCT

A two-gene epigenetic signature for the prediction of response to neoadjuvant chemotherapy in triple-negative breast cancer patients

Octavio BurguesAna B. CrujeirasBegoña PinedaInés González-barralloJuan SandovalAna LluchManel EstellerJose Alejandro Perez-fidalgoAngel Diaz-lagaresPilar Eroles

subject

0301 basic medicineOncologymedicine.medical_treatmentADNlcsh:MedicineTriple Negative Breast NeoplasmsEpigenesis Genetic0302 clinical medicineGenetics (clinical)Triple-negative breast cancermedicine.diagnostic_testHigh-Throughput Nucleotide SequencingNuclear ProteinsMethylationMiddle AgedNeoadjuvant TherapyGene Expression Regulation NeoplasticTreatment OutcomeMyogenic Regulatory FactorsEfectes secundaris dels medicaments030220 oncology & carcinogenesisCohortFemaleTaxoidsMetilacióMicrotubule-Associated ProteinsAdultmedicine.medical_specialtylcsh:QH426-470MethylationMinor Histocompatibility Antigens03 medical and health sciencesBreast cancerTriple-negative breast cancerInternal medicineCell Line TumorBiopsyGeneticsmedicineHumansEpigeneticsMolecular BiologyEpigenetic signatureAgedChemotherapybusiness.industryGene Expression ProfilingResearchlcsh:RSequence Analysis DNADNADNA Methylationmedicine.diseaseHuman geneticsRepressor Proteinslcsh:Genetics030104 developmental biologyDrug side effectsbusinessPredictionDevelopmental Biology

description

Background Pathological complete response (pCR) after neoadjuvant chemotherapy (NAC) in triple-negative breast cancer (TNBC) varies between 30 and 40% approximately. To provide further insight into the prediction of pCR, we evaluated the role of an epigenetic methylation-based signature. Methods Epigenetic assessment of DNA extracted from biopsy archived samples previous to NAC from TNBC patients was performed. Patients included were categorized according to previous response to NAC in responder (pCR or residual cancer burden, RCB = 0) or non-responder (non-pCR or RCB > 0) patients. A methyloma study was performed in a discovery cohort by the Infinium HumanMethylation450 BeadChip (450K array) from Illumina. The epigenetic silencing of those methylated genes in the discovery cohort were validated by bisulfite pyrosequencing (PyroMark Q96 System version 2.0.6, Qiagen) and qRT-PCR in an independent cohort of TN patients and in TN cell lines. Results Twenty-four and 30 patients were included in the discovery and validation cohorts, respectively. In the discovery cohort, nine genes were differentially methylated: six presented higher methylation in non-responder patients (LOC641519, LEF1, HOXA5, EVC2, TLX3, CDKL2) and three greater methylation in responder patients (FERD3L, CHL1, and TRIP10). After validation, a two-gene (FER3L and TRIP10) epigenetic score predicted RCB = 0 with an area under the ROC curve (AUC) = 0.905 (95% CI = 0.805–1.000). Patients with a positive epigenetic two-gene score showed 78.6% RCB = 0 versus only 10.7% RCB = 0 if signature were negative. Conclusions These results suggest that pCR in TNBC could be accurately predicted with an epigenetic signature of FERD3L and TRIP10 genes. Further prospective validation of these findings is warranted. Electronic supplementary material The online version of this article (10.1186/s13148-019-0626-0) contains supplementary material, which is available to authorized users.

yearjournalcountryeditionlanguage
2019-02-20
10.1186/s13148-019-0626-0http://hdl.handle.net/2445/171758