Mutational landscape of pure ductal carcinoma in situ and associations with disease prognosis and response to radiotherapy

Abstract Background Managing Ductal Carcinoma in Situ (DCIS) remains challenging due to the lack of reliable biomarkers to predict radiotherapy (RT) response, leading to both overtreatment of indolent disease and undertreatment of aggressive cases. Results Through whole-exome sequencing of 147 DCIS...

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Main Authors: Noor Rizvi, Eliseos J. Mucaki, Emily L. Salmini, Monica Zhang, Sabina Trebinjac, Ezra Hahn, Lawrence Paszat, Sharon Nofech-Mozes, Michael T. Hallett, Eileen Rakovitch, Vanessa Dumeaux
Format: Article
Language:English
Published: BMC 2025-07-01
Series:Breast Cancer Research
Online Access:https://doi.org/10.1186/s13058-025-02080-z
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author Noor Rizvi
Eliseos J. Mucaki
Emily L. Salmini
Monica Zhang
Sabina Trebinjac
Ezra Hahn
Lawrence Paszat
Sharon Nofech-Mozes
Michael T. Hallett
Eileen Rakovitch
Vanessa Dumeaux
author_facet Noor Rizvi
Eliseos J. Mucaki
Emily L. Salmini
Monica Zhang
Sabina Trebinjac
Ezra Hahn
Lawrence Paszat
Sharon Nofech-Mozes
Michael T. Hallett
Eileen Rakovitch
Vanessa Dumeaux
author_sort Noor Rizvi
collection DOAJ
description Abstract Background Managing Ductal Carcinoma in Situ (DCIS) remains challenging due to the lack of reliable biomarkers to predict radiotherapy (RT) response, leading to both overtreatment of indolent disease and undertreatment of aggressive cases. Results Through whole-exome sequencing of 147 DCIS cases, we characterized the genomic landscape of pure DCIS and identified genetic alterations associated with the risk of recurrence, either in-situ or invasive. DCIS lesions harbored frequent mutations in established cancer drivers (PIK3CA, TP53) and genes regulating tissue architecture, which likely enhanced pre-invasive cell fitness but lacked prognostic value. A subset of younger patients exhibited distinct mutational processes characterized by high mutational burden, though these were not linked to recurrence risk. Across the cohort, five mostly mutually exclusive genes (SH2B2, PDZD8, MYO7A, MUCL3, DNASE2B), involved in cell adhesion, membrane organization, and DNA degradation, were significantly associated with 10-year risk of local recurrence. In RT-treated patients, we identified 27 additional mutated genes uniquely associated with recurrence, along with SH2B2 and MUCL3. Most of these genes were involved in cytoskeletal regulation, cell adhesion, and cell-environment interactions. Mutations in metabolic regulators (MGAM2 and AADACL3) and REV1, which mediates DNA damage tolerance, may impair cellular responses to RT-induced stress. Notably, we identified distinct genes prognostic for in-situ versus invasive recurrence: nineteen genes predominantly involved in tissue structural maintenance in in-situ relapse, and thirteen genes primarily affecting cell-cycle and genome-stability pathways in invasive progression. Copy number analyses revealed that pure DCIS exhibits molecular subtype-specific patterns characteristic of invasive disease, with novel alterations associated with recurrence, including three non-adjacent gains and five losses in regions harboring oncogenes, tumor suppressor genes, and genes regulating structural integrity, cell-cell adhesion and interactions. Conclusions While TP53, PIK3CA, and recurrent copy number alterations represent early events in tumorigenesis, they lack prognostic value in pure DCIS, underscoring the need for alternative biomarkers. Our findings identify key genetic alterations associated with local recurrence and RT resistance. We further uncovered distinct molecular programs underlying in-situ versus invasive recurrence, with mutations affecting tissue structural maintenance in in-situ relapse and cell-cycle/genome-stability pathways in invasive progression.
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spelling doaj-art-8df242cd5a1d4c33bd947d664039c1622025-08-20T04:03:07ZengBMCBreast Cancer Research1465-542X2025-07-0127111910.1186/s13058-025-02080-zMutational landscape of pure ductal carcinoma in situ and associations with disease prognosis and response to radiotherapyNoor Rizvi0Eliseos J. Mucaki1Emily L. Salmini2Monica Zhang3Sabina Trebinjac4Ezra Hahn5Lawrence Paszat6Sharon Nofech-Mozes7Michael T. Hallett8Eileen Rakovitch9Vanessa Dumeaux10Department of Biochemistry, Western UniversityDepartment of Biochemistry, Western UniversityDepartment of Biochemistry, Western UniversityDepartment of Anatomy and Cell Biology, Western UniversityDepartment of Radiation Oncology, Sunnybrook Health Sciences Centre, University of TorontoDepartment of Radiation Oncology, Sunnybrook Health Sciences Centre, University of TorontoDepartment of Radiation Oncology, Sunnybrook Health Sciences Centre, University of TorontoDepartment of Pathology, Sunnybrook Health Sciences Centre, University of TorontoDepartment of Biochemistry, Western UniversityDepartment of Radiation Oncology, Sunnybrook Health Sciences Centre, University of TorontoDepartment of Biochemistry, Western UniversityAbstract Background Managing Ductal Carcinoma in Situ (DCIS) remains challenging due to the lack of reliable biomarkers to predict radiotherapy (RT) response, leading to both overtreatment of indolent disease and undertreatment of aggressive cases. Results Through whole-exome sequencing of 147 DCIS cases, we characterized the genomic landscape of pure DCIS and identified genetic alterations associated with the risk of recurrence, either in-situ or invasive. DCIS lesions harbored frequent mutations in established cancer drivers (PIK3CA, TP53) and genes regulating tissue architecture, which likely enhanced pre-invasive cell fitness but lacked prognostic value. A subset of younger patients exhibited distinct mutational processes characterized by high mutational burden, though these were not linked to recurrence risk. Across the cohort, five mostly mutually exclusive genes (SH2B2, PDZD8, MYO7A, MUCL3, DNASE2B), involved in cell adhesion, membrane organization, and DNA degradation, were significantly associated with 10-year risk of local recurrence. In RT-treated patients, we identified 27 additional mutated genes uniquely associated with recurrence, along with SH2B2 and MUCL3. Most of these genes were involved in cytoskeletal regulation, cell adhesion, and cell-environment interactions. Mutations in metabolic regulators (MGAM2 and AADACL3) and REV1, which mediates DNA damage tolerance, may impair cellular responses to RT-induced stress. Notably, we identified distinct genes prognostic for in-situ versus invasive recurrence: nineteen genes predominantly involved in tissue structural maintenance in in-situ relapse, and thirteen genes primarily affecting cell-cycle and genome-stability pathways in invasive progression. Copy number analyses revealed that pure DCIS exhibits molecular subtype-specific patterns characteristic of invasive disease, with novel alterations associated with recurrence, including three non-adjacent gains and five losses in regions harboring oncogenes, tumor suppressor genes, and genes regulating structural integrity, cell-cell adhesion and interactions. Conclusions While TP53, PIK3CA, and recurrent copy number alterations represent early events in tumorigenesis, they lack prognostic value in pure DCIS, underscoring the need for alternative biomarkers. Our findings identify key genetic alterations associated with local recurrence and RT resistance. We further uncovered distinct molecular programs underlying in-situ versus invasive recurrence, with mutations affecting tissue structural maintenance in in-situ relapse and cell-cycle/genome-stability pathways in invasive progression.https://doi.org/10.1186/s13058-025-02080-z
spellingShingle Noor Rizvi
Eliseos J. Mucaki
Emily L. Salmini
Monica Zhang
Sabina Trebinjac
Ezra Hahn
Lawrence Paszat
Sharon Nofech-Mozes
Michael T. Hallett
Eileen Rakovitch
Vanessa Dumeaux
Mutational landscape of pure ductal carcinoma in situ and associations with disease prognosis and response to radiotherapy
Breast Cancer Research
title Mutational landscape of pure ductal carcinoma in situ and associations with disease prognosis and response to radiotherapy
title_full Mutational landscape of pure ductal carcinoma in situ and associations with disease prognosis and response to radiotherapy
title_fullStr Mutational landscape of pure ductal carcinoma in situ and associations with disease prognosis and response to radiotherapy
title_full_unstemmed Mutational landscape of pure ductal carcinoma in situ and associations with disease prognosis and response to radiotherapy
title_short Mutational landscape of pure ductal carcinoma in situ and associations with disease prognosis and response to radiotherapy
title_sort mutational landscape of pure ductal carcinoma in situ and associations with disease prognosis and response to radiotherapy
url https://doi.org/10.1186/s13058-025-02080-z
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