Effects of anastrozole on cognitive performance in postmenopausal women: a randomised, double-blind chemoprevention trial (IBIS II).
AuthorsJenkins, Valerie A
Ambroisine, Laurence M
Fallowfield, Lesley J
AffiliationCancer Research UK Psychosocial Oncology Group, Brighton and Sussex Medical School, University of Sussex, Falmer, Brighton, UK.
MetadataShow full item record
AbstractBACKGROUND: Mild cognitive impairments have been recorded in cross-sectional studies of women with breast cancer receiving endocrine treatment. More comprehensive studies were warranted because aromatase inhibitors are being used increasingly in both chemoprevention and adjuvant settings. We report findings from the cognitive subprotocol of the International Breast Intervention Study (IBIS II), a double-blind placebo-controlled trial of anastrozole in postmenopausal women at high risk of developing breast cancer. We aimed to study and compare the effect of anastrozole versus placebo on memory and attention in these women. METHODS: Between Jan 3, 2003, and Dec 21, 2005, participants were recruited into the cognitive subprotocol from five UK centres. Cognitive assessments were done before randomisation, at 6 months, and at 24 months. 227 of 249 women approached completed a comprehensive set of standardised cognitive tasks at baseline and were randomly assigned to receive anastrozole (1 mg/day for 5 years) or placebo. Psychological morbidity, endocrine symptoms, and self-reported cognitive complaints were also measured. The main outcomes were cognitive task scores at baseline, 6 months, and 24 months. Analyses were done by intention to treat. This study is registered as an International Standard Randomised Controlled Trial, number ISRCTN31488319. FINDINGS: 111 women were assigned to anastrozole and 116 women to placebo. At 6 months, ten women in each group were excluded from analysis, leaving a total of 207 of 227 (91%) women available for further assessments. At 24 months, 24 women were excluded from the anastrozole group and 32 from the placebo group, leaving 151 of 227 (67%) women. We did not note any significant differences between the groups for any of the cognitive tasks. By 6 months, 13 women in both groups reported changes to their memory and this had decreased to five women in the placebo group and three women in the anastrozole group by the 24-month assessment. Significantly more women in the anastrozole group complained of hot flushes at 24 months (23 of 76 [30%] vs 11 of 73 [15%], p=0.032, not corrected for multiple comparison), but this was the only difference in reported endocrine symptoms. INTERPRETATION: These findings show little or no impairment of cognitive performance with the use of anastrozole compared with placebo in postmenopausal women at high risk of developing breast cancer who were able to tolerate endocrine-related side-effects. Future studies assessing cognition should be done within randomised trials with baseline assessments to ascertain the true extent of the putative effects that treatments for breast cancer might have on memory and attention. FUNDING: Cancer Research UK, London, UK (grant numbers C6280/A3162 and C6280/A6764).
CitationEffects of anastrozole on cognitive performance in postmenopausal women: a randomised, double-blind chemoprevention trial (IBIS II). 2008, 9 (10):953-61 Lancet Oncol.
JournalThe Lancet Oncology
- Anastrozole for prevention of breast cancer in high-risk postmenopausal women (IBIS-II): an international, double-blind, randomised placebo-controlled trial.
- Authors: Cuzick J, Sestak I, Forbes JF, Dowsett M, Knox J, Cawthorn S, Saunders C, Roche N, Mansel RE, von Minckwitz G, Bonanni B, Palva T, Howell A, IBIS-II investigators.
- Issue date: 2014 Mar 22
- Anastrozole versus tamoxifen for the prevention of locoregional and contralateral breast cancer in postmenopausal women with locally excised ductal carcinoma in situ (IBIS-II DCIS): a double-blind, randomised controlled trial.
- Authors: Forbes JF, Sestak I, Howell A, Bonanni B, Bundred N, Levy C, von Minckwitz G, Eiermann W, Neven P, Stierer M, Holcombe C, Coleman RE, Jones L, Ellis I, Cuzick J, IBIS-II investigators.
- Issue date: 2016 Feb 27
- Changes in bone mineral density at 3 years in postmenopausal women receiving anastrozole and risedronate in the IBIS-II bone substudy: an international, double-blind, randomised, placebo-controlled trial.
- Authors: Sestak I, Singh S, Cuzick J, Blake GM, Patel R, Gossiel F, Coleman R, Dowsett M, Forbes JF, Howell A, Eastell R
- Issue date: 2014 Dec
- Anastrozole versus tamoxifen in postmenopausal women with ductal carcinoma in situ undergoing lumpectomy plus radiotherapy (NSABP B-35): a randomised, double-blind, phase 3 clinical trial.
- Authors: Margolese RG, Cecchini RS, Julian TB, Ganz PA, Costantino JP, Vallow LA, Albain KS, Whitworth PW, Cianfrocca ME, Brufsky AM, Gross HM, Soori GS, Hopkins JO, Fehrenbacher L, Sturtz K, Wozniak TF, Seay TE, Mamounas EP, Wolmark N
- Issue date: 2016 Feb 27
- Weight change associated with anastrozole and tamoxifen treatment in postmenopausal women with or at high risk of developing breast cancer.
- Authors: Sestak I, Harvie M, Howell A, Forbes JF, Dowsett M, Cuzick J
- Issue date: 2012 Jul