Patients
cancer, cognitive complaints, breast cancer
CANCER, BREAST CANCER
Eligible for inclusion were women, diagnosed with stage I-III breast cancer 2–4 years before study enrollment, who had been treated with (neo)adjuvant chemotherapy, were between 30 and 75 years, reported to be relatively inactive (150 min or less of moderate to vigorous physical activity per week), were sufficiently proficient in the Dutch language, and agreed to be randomized to either the intervention or control group. Only patients who reported cognitive complaints since cancer diagnosis or treatment (in a semi-structured interview) and who demonstrated lower than expected cognitive performance on onlineneuropsychological testing were included (≥ 1 normative standard deviation (based on sex and age) lower on ≥ 2 tests in ≥ 2 (out of 5) cognitive domains) (Content of the Amsterdam Cognition Scan.Age, education, menopausal status, and age at menopause were assessed with a questionnaire. Clinical characteristics were retrieved form medical records. Medical use (including endocrine therapy use) was assessed during an interview.