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The Functional Assessment of Cancer Therapy-Cognitive Function-Version 3 (FACT-Cog-v3) is the most extensively used instrument specifically developed to evaluate cognitive complaints in adult cancer patients. Nevertheless, this self-report measure is not yet validated for the Portuguese population. Therefore, the purpose of this study was to evaluate the psychometric properties of the FACT-Cog-v3 among patients with non-CNS cancers in Portugal.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>The validation study was conducted based on a convenience sample of 281 patients with non-CNS cancers, aged between 18 and 65\u00a0years, recruited online. A confirmatory factor analysis (CFA) was used to test the factor structure of the Portuguese FACT-Cog-v3 version; internal consistency analysis was also conducted. The European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core-30 (EORTC QLQ-C30\u2013version 3) and the Hospital Anxiety and Depression Scale (HADS) were also used to test the concurrent, convergent, and discriminant validity of the scale.\n<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>CFA supported a four-factor model with good fix indexes and internal consistencies: perceived cognitive impairments (\u03b1\u2009=\u20090.97), comments from others (\u03b1\u2009=\u20090.92), perceived cognitive abilities (\u03b1\u2009=\u20090.93), and impact on quality of life (\u03b1\u2009=\u20090.92). Concurrent, convergent, and discriminant validities were confirmed. Moderate and strong correlations were found between the FACT-Cog-v3 subscales and the QLQ-C30 cognitive functioning subscale. Good convergent validity, with moderate correlations, was found between the FACT-Cog-v3 subscales and the HADS-A, HADS-D, and QLQ-C30 fatigue, sleep disturbance, and global health status subscales. Acceptable discriminant validity, with weak and moderate correlations, was demonstrated between the FACT-Cog-v3 subscales and the QLQ-C30 pain and nausea\/vomiting subscales.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>The Portuguese FACT-Cog-v3 version can be considered a reliable and valid measure to assess cognitive concerns of patients with non-CNS cancers, with relevance for research and clinical practice.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40359-022-01018-w","type":"journal-article","created":{"date-parts":[[2022,12,14]],"date-time":"2022-12-14T10:03:01Z","timestamp":1671012181000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Validation study of the Functional Assessment of Cancer Therapy-Cognitive Function-Version 3 for the Portuguese population"],"prefix":"10.1186","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0883-7361","authenticated-orcid":false,"given":"Ana F.","family":"Oliveira","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2404-4035","authenticated-orcid":false,"given":"Isabel M.","family":"Santos","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2006-8187","authenticated-orcid":false,"given":"Sofia","family":"Fernandes","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7547-5743","authenticated-orcid":false,"given":"Pedro","family":"Bem-Haja","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8919-0378","authenticated-orcid":false,"given":"Ana","family":"Torres","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2022,12,14]]},"reference":[{"key":"1018_CR1","doi-asserted-by":"publisher","unstructured":"Mayo SJ, Lustberg M, M. 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