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
Description
ISSN:1471-2407
DOI:10.1186/s12885-026-15994-4