medRxiv PreprintsInternational15 October 2026
No decline in functional status or cognitive function during the first year after treatment initiation for early-stage breast cancer in women aged 75 years and older: a prospective observational matched cohort study
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Background: This study compared functional and cognitive trajectories in older women treated for early breast cancer with matched women without cancer. Methods: Data were derived from two Dutch cohorts: the CLIMB study (women aged 75 years and older with operable breast cancer) and the ISCOPE study (community-dwelling women aged 75 years and older without cancer). Breast cancer patients were matched 1:2 to controls on age and baseline functional or cognitive status. Functional status was assessed using the Groningen Activity Restriction Scale (GARS), and cognitive function using the Mini-Menta
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