Impact of COVID-19 on breast cancer care - a retrospective cohort study in Brazil.

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Title: Impact of COVID-19 on breast cancer care - a retrospective cohort study in Brazil.
Authors: Nascimento DW; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil. diego.nascimento@hc.fm.usp.br.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil. diego.nascimento@hc.fm.usp.br.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil. diego.nascimento@hc.fm.usp.br., Filassi JR; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil., Cunha ÂFT; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil., Gonçalves R; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil., Kuller MB; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil., Maesaka JY; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.; Albert Einstein Israeli Hospital, São Paulo, Brazil., de Freitas GB; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil., Lima BSS; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil., Reis YN; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil., Mota RMS; Federal University of Ceará, Fortaleza, Brazil., de Abreu Freitas RP; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil., Piato JRM; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil., Barros LRC; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil., Teixeira LAB; Department of Radiotherapy, Faculty of Medicine University of São Paulo, São Paulo, Brazil., Stuart SR; Department of Radiotherapy, Faculty of Medicine University of São Paulo, São Paulo, Brazil., Formigoni MC; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil., Baracat EC; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil., Júnior JMS; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil., Mota BS; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil.
Source: BMC cancer [BMC Cancer] 2026 Apr 16; Vol. 26 (1). Date of Electronic Publication: 2026 Apr 16.
Publication Type: Journal Article
Journal Info: Publisher: BioMed Central Country of Publication: England NLM ID: 100967800 Publication Model: Electronic Cited Medium: Internet ISSN: 1471-2407 (Electronic) Linking ISSN: 14712407 NLM ISO Abbreviation: BMC Cancer Subsets: MEDLINE
Database: MEDLINE Ultimate
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  Data: Impact of COVID-19 on breast cancer care - a retrospective cohort study in Brazil.
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  Data: <searchLink fieldCode="AU" term="%22Nascimento+DW%22">Nascimento DW</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil. diego.nascimento@hc.fm.usp.br.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil. diego.nascimento@hc.fm.usp.br.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil. diego.nascimento@hc.fm.usp.br.<br /><searchLink fieldCode="AU" term="%22Filassi+JR%22">Filassi JR</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Cunha+ÂFT%22">Cunha ÂFT</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Gonçalves+R%22">Gonçalves R</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Kuller+MB%22">Kuller MB</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Maesaka+JY%22">Maesaka JY</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.; Albert Einstein Israeli Hospital, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22de+Freitas+GB%22">de Freitas GB</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Lima+BSS%22">Lima BSS</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Reis+YN%22">Reis YN</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Mota+RMS%22">Mota RMS</searchLink>; Federal University of Ceará, Fortaleza, Brazil.<br /><searchLink fieldCode="AU" term="%22de+Abreu+Freitas+RP%22">de Abreu Freitas RP</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Piato+JRM%22">Piato JRM</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Barros+LRC%22">Barros LRC</searchLink>; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Teixeira+LAB%22">Teixeira LAB</searchLink>; Department of Radiotherapy, Faculty of Medicine University of São Paulo, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Stuart+SR%22">Stuart SR</searchLink>; Department of Radiotherapy, Faculty of Medicine University of São Paulo, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Formigoni+MC%22">Formigoni MC</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Baracat+EC%22">Baracat EC</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Júnior+JMS%22">Júnior JMS</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil.<br /><searchLink fieldCode="AU" term="%22Mota+BS%22">Mota BS</searchLink>; Department of Mastology, Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, Sao Paulo, Sao Paulo, Brazil.; Instituto do Câncer do Estado de São Paulo - Octavio Frias de Oliveira, University of São Paulo, Arnaldo Avenue, 251, São Paulo, São Paulo, Brazil.; Division of Gynecology and Obstetrics, Faculty of Medicine of University of São Paulo, University of São Paulo, Arnaldo Avenue, 455, São Paulo, Brazil.
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  Data: <searchLink fieldCode="JN" term="%22100967800%22">BMC cancer</searchLink> [BMC Cancer] 2026 Apr 16; Vol. 26 (1). <i>Date of Electronic Publication: </i>2026 Apr 16.
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  Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22BioMed+Central%22">BioMed Central </searchLink><i>Country of Publication: </i>England <i>NLM ID: </i>100967800 <i>Publication Model: </i>Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1471-2407 (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%2214712407%22">14712407 </searchLink><i>NLM ISO Abbreviation: </i>BMC Cancer <i>Subsets: </i>MEDLINE
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