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As the prevalence of type 2 diabetes (T2D) is predicted to double during the next two decades, a better understanding of the interplay between CLL and T2D is of increasing importance. In this study, analyses were performed in parallel in two separate cohorts, based on Danish national registers and the Mayo Clinic CLL Resource. The primary outcomes were overall survival (OS) from time of CLL diagnosis, OS from time of treatment, and time to first treatment (TTFT), studied using Cox proportional hazard regression analysis and Fine\u2010Gray regression analysis. In the Danish CLL cohort, the prevalence of T2D was 11%, in the Mayo CLL cohort, it was 12%. Patients with CLL and T2D had shorter OS both from time of diagnosis and from first\u2010line treatment for were less likely to receive treatment for CLL compared with patients with CLL and without T2D. The increased mortality was largely driven by an increased risk of death due to infections, especially in the Danish cohort. The findings of this study emphasize a substantial subgroup of CLL patients with co\u2010occurring T2D with an inferior prognosis and a possible unmet treatment need requiring additional interventions and further research.<\/jats:p>","DOI":"10.1002\/ajh.26964","type":"journal-article","created":{"date-parts":[[2023,5,22]],"date-time":"2023-05-22T11:11:36Z","timestamp":1684753896000},"page":"1236-1245","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Impact of type 2 diabetes on mortality, cause of death, and treatment in chronic lymphocytic leukemia"],"prefix":"10.1002","volume":"98","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4199-772X","authenticated-orcid":false,"given":"Emelie Curovic","family":"Rotbain","sequence":"first","affiliation":[{"name":"Department of Hematology Rigshospitalet  Copenhagen Denmark"},{"name":"Hematology Group Danish Cancer Society Research Center  Copenhagen 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