Stage at diagnosis and stage-specific survival of breast cancer in Latin America and the Caribbean: A systematic review and meta-analysis


Autoři: Lívia Lovato Pires de Lemos aff001;  Mirian Carvalho de Souza aff003;  Daniela Pena Moreira aff001;  Paulo Henrique Ribeiro Fernandes Almeida aff004;  Brian Godman aff005;  Stéphane Verguet aff007;  Augusto Afonso Guerra, Junior aff002;  Mariangela Leal Cherchiglia aff001
Působiště autorů: Programa de Pós-Graduação em Saúde Pública, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil aff001;  SUS Collaborating Centre for Technology Assessment and Excellence in Health, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil aff002;  Divisão de Pesquisa Populacional, Instituto Nacional de Câncer José Alencar Gomes da Silva, Rio de Janeiro, Rio de Janeiro, Brazil aff003;  Programa de Pós-Graduação em Medicamentos e Assistência Farmacêutica, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil aff004;  Strathclyde Institute of Pharmacy and Biomedical Sciences, Strathclyde University, Glasgow, Scotland aff005;  Division of Clinical Pharmacology, Karolinska University Hospital Huddinge, Karolinska Institutet, Huddinge, Sweden aff006;  Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, United States of America aff007
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224012

Souhrn

Background

Female breast cancer is the most common cancer in Latin American and Caribbean (LAC) countries and is the leading cause of cancer deaths. The high mortality-to-incidence ratio in the regions is associated with mainly the high proportion of advanced stage diagnosis, and also to inadequate access to health care. In this study we aimed to systematically review the proportion of advanced stage (III-IV) at diagnosis (pas) and the five-year stage-specific survival estimates of breast cancer in LAC countries.

Methods

We searched MEDLINE, Embase, and LILACS (Latin American and Caribbean Health Science Literature) to identify studies, in any language, indexed before Nov 5, 2018. We also conducted manual search by reviewing citations of papers found. pas was summarized by random effects model meta-analysis, and meta-regression analysis to identify sources of variation. Stage-specific survival probabilities were described as provided by study authors, as it was not possible to conduct meta-analysis. PROSPERO CRD42017052493.

Results

For pas we included 63 studies, 13 of which population-based, from 22 countries comprising 221,255 women diagnosed from 1966 to 2017. The distribution of patients by stage varied greatly in LAC (pas 40.8%, 95%CI 37.0% to 44.6%; I2 = 99%; p<0.0001). The heterogeneity was not explained by any variable included in the meta-regression. There was no difference in pas among the Caribbean (pas 43.0%, 95%CI 33.1% to 53.6%), Central America (pas 47.0%, 95%CI 40.4% to 53.8%) and South America (pas 37.7%, 95%CI 33.1% to 42.5%) regions. For 5-year stage-specific survival we included 37 studies, comprising 28,988 women from ten countries. Seven of these studies were included also for pas. Since we were unable to adjust for age, comparability between countries and regions was hampered, and as expected, the results varied widely from study to study.

Conclusions

LAC countries should look to address concerns with early detection and diagnosis of breast cancer, and wherever viable implement screening programs and to provide timely treatment.

Klíčová slova:

Breast cancer – Cancer detection and diagnosis – Cancer screening – Cancer treatment – Caribbean – Latin American people – Metaanalysis – Systematic reviews


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