Risk of dementia in older breast cancer survivors: a population-based cohort study of the association with adjuvant chemotherapy.

Objectives: To assess whether there is an association between delivery of adjuvant chemotherapy to older women with breast cancer and development of dementia over time.

Design: Retrospective cohort study using Surveillance, Epidemiology, and End Results (SEER) data linked to Medicare claims data.

Setting: Women residing in geographic areas included in the SEER registry.