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Translation and cultural adaptation followed the EORTC procedure and included expert review and cognitive debriefing. Psychometric evaluation used baseline data from 142 women and six-month follow-up data from 47. Analyses included item-level indicators, internal consistency, multitrait scaling, inter-scale correlations, correlations with the Stress Symptom Scale, and paired change analyses. Conditional QLQ-BR45 items were treated as structurally missing when not applicable.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Expert review and cognitive debriefing supported linguistic, conceptual, and cultural appropriateness. Reliability and item-scale correspondence were acceptable for several domains, with particularly strong multitrait scaling results for QLQ-BR45 Body Image, Sexual Functioning, and Breast Symptoms. Correlations between EORTC functioning and symptom domains and the Stress Symptom Scale were generally in the hypothesised directions. Six-month findings showed clinically plausible changes in functioning and treatment-related symptoms, but estimates were based on a smaller follow-up sample and reduced valid samples for some conditional scales.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The Latvian EORTC QLQ-C30 and QLQ-BR45 showed acceptable preliminary psychometric performance. The findings provide initial support for their use to assess HRQoL and breast cancer-specific symptoms in Latvia, while larger multicentre and longitudinal studies are needed to evaluate additional measurement properties and responsiveness.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s11136-026-04394-7","type":"journal-article","created":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T13:07:15Z","timestamp":1790341635000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Adaptation and initial psychometric validation of the Latvian version of EORTC QLQ-C30 and QLQ-BR45 in women with breast cancer"],"prefix":"10.1007","volume":"35","author":[{"given":"Ingrida","family":"Trups-Kalne","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Nesaule","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauma","family":"Springe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lubova","family":"Tihomirova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vita","family":"Steina","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Viktorija","family":"Pacukevica-Stope","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Rotberga","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jelena","family":"Maksimenko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arvids","family":"Irmejs","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elita","family":"Poplavska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,25]]},"reference":[{"key":"4394_CR1","unstructured":"International Agency for Research on Cancer (2024). 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Arvids Irmejs has received speaker honoraria from MSD and Novartis during the last two years. Lubova Tihomirova is employed by MSD.","order":1,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"This study was approved by the Research Ethics Committee of R\u012bga Stradi\u0146\u0161 University (No. 2-P\u0112K-4\/479\/2024). All participants received oral and written study information and provided informed consent before enrolment. Participants could withdraw at any time.","order":2,"name":"Ethics","label":"Ethics approval","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Informed consent was obtained from all individual participants included in the study.","order":3,"name":"Ethics","label":"Consent to participate","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"People with lived experience were involved in the translation evaluation through cognitive debriefing, and the breast cancer patient association \u201cP\u0101rdz\u012bvot\u201d supported recruitment for this phase. Patients were not involved as coinvestigators in the study design, statistical analysis, or dissemination planning.","order":4,"name":"Ethics","label":"Patient, public or community engagement","group":{"name":"EthicsHeading","label":"Declarations"}}],"article-number":"294"}}