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We obtained data of women diagnosed between 2008 and 2012 from 11 population\u2010based cancer registries (PBCRs) in 10 countries, with follow\u2010up until December 2014. Following stage data standardization and multiple imputation for missing data, we estimated age\u2010standardized 1\u2010, 3\u2010, and 5\u2010year net survival (ASNS) by stage and age group. Stage distribution varied significantly across jurisdictions. Puerto Rico had over 4 in 5 patients diagnosed with early stage (stage I\/II), while India, Trivandrum, and Thailand, Khon Kaen had &lt;3 in 5 diagnosed with early stage. Stage\u2010specific ASNS was similar across early stages (stage I\/II) but varied markedly for stage IV, where the highest 3\u2010year ASNS (Puerto Rico: 43.2% 95% CI: 38.9%\u201347.6%) was 20 percentage points higher than the lowest 3\u2010year ASNS (India, Trivandrum: 22.8% 95% CI: 10.2%\u201335.4%). ASNS for patients 60\u2009years and older was generally lower than for patients younger than 60\u2009years across all jurisdictions. Differences in ASNS were subtle in early stages but were especially pronounced for stage IV, where in Puerto Rico, 3\u2010year ASNS for patients younger than 60 (49.0% 95% CI: 42.7%\u201355.2%) was over 13 percentage points higher than 3\u2010year ASNS for patients 60 or older (35.4% 95% CI: 29.2%\u201341.7%). Disparities in breast cancer survival were partly explained by differences in early diagnosis and in care at late stages. Stage at diagnosis is an important indicator that should be collected by registries worldwide, particularly for late\u2010stage disease and older patients.<\/jats:p>","DOI":"10.1002\/ijc.70353","type":"journal-article","created":{"date-parts":[[2026,1,27]],"date-time":"2026-01-27T14:12:12Z","timestamp":1769523132000},"page":"92-100","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Breast cancer survival by stage at diagnosis in countries in transition: A population\u2010based study"],"prefix":"10.1002","volume":"159","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-6976-819X","authenticated-orcid":false,"given":"Hanna","family":"Fink","sequence":"first","affiliation":[{"name":"Cancer Surveillance Branch International Agency for Research on Cancer (IARC\/WHO)  Lyon France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eileen","family":"Morgan","sequence":"additional","affiliation":[{"name":"Cancer Surveillance Branch International Agency for Research on Cancer (IARC\/WHO)  Lyon France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aude","family":"Bardot","sequence":"additional","affiliation":[{"name":"Cancer Surveillance Branch International Agency for Research on Cancer (IARC\/WHO)  Lyon France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Jurado","sequence":"additional","affiliation":[{"name":"Public Health Research Group Universidad de Nari\u00f1o  Pasto Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wilmer","family":"Tarupi","sequence":"additional","affiliation":[{"name":"National Cancer Registry SOLCA  Quito Ecuador"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Supakorn","family":"Pitakkarnkul","sequence":"additional","affiliation":[{"name":"Division of Gynecologic Oncology National Cancer Institute, Department of Medical Services, Ministry of Public Health  Bangkok Thailand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1574-7356","authenticated-orcid":false,"given":"Aleyamma","family":"Mathew","sequence":"additional","affiliation":[{"name":"Regional Cancer Center  Thiruvananthapuram India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rama","family":"Ranganathan","sequence":"additional","affiliation":[{"name":"Cancer Institute  Chennai India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luisa Bravo","family":"Goyes","sequence":"additional","affiliation":[{"name":"Population Cancer Registry  Pasto Colombia"},{"name":"University of Narino  Pasto Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0864-4751","authenticated-orcid":false,"given":"Freddy","family":"Gnangnon","sequence":"additional","affiliation":[{"name":"Cotonou Cancer Registry  Cotonou Benin"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guledal","family":"Boztas","sequence":"additional","affiliation":[{"name":"Ankara Cancer Registry  Ankara Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6017-741X","authenticated-orcid":false,"given":"Isabelle","family":"Soerjomataram","sequence":"additional","affiliation":[{"name":"Cancer Surveillance Branch International Agency for Research on Cancer (IARC\/WHO)  Lyon France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"name":"the SURVCAN\u20103 Collaborators","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,1,27]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.3322\/caac.21834"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(17)33326-3"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/ijc.32406"},{"key":"e_1_2_10_5_1","unstructured":"United Nations Development Programme.Human Development Report 2021\/22. 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