Osteoporosis therapy and outcomes for postmenopausal patients with hormone receptor-positive breast cancer: NCIC CTG MA.27.

Lipton, Allan; Chapman, Judith-Anne W; Leitzel, Kim; Garg, Ashwani; Pritchard, Kathleen I; Ingle, James N; Budd, G Thomas; Ellis, Matthew J; Sledge, George W; Rabaglio, Manuela; Han, Lei; Elliott, Catherine R; Shepherd, Lois E; Goss, Paul E; Ali, Suhail M (2017). Osteoporosis therapy and outcomes for postmenopausal patients with hormone receptor-positive breast cancer: NCIC CTG MA.27. Cancer, 123(13), pp. 2444-2451. John Wiley & Sons 10.1002/cncr.30682

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BACKGROUND Breast cancer patients in the MA.27 trial had similar outcomes with steroidal aromatase inhibitor (AI) exemestane and nonsteroidal anastrozole. AIs increase the risk of osteoporosis. This study examined the effects of self-reported osteoporosis and osteoporosis therapy (OPT) on outcomes. METHODS The MA.27 phase 3 adjuvant trial enrolled 7576 postmenopausal women. The primary outcome was event-free survival (EFS), and the secondary outcome was distant disease-free survival (DDFS). Patients were permitted bisphosphonates to prevent or treat osteopenia/osteoporosis. In a multivariate, stratified Cox regression, factors were significant with a 2-sided Wald test P value ≤ .05. RESULTS Osteoporosis was reported at the baseline by 654 of the 7576 women (8.6%) and in total by 1294 patients. Oral OPT was received at the baseline by 815 of the 7576 women (10.8%) and in total by 2711 patients (36%). With a median follow-up of 4.1 years, 693 EFS events (9.15%) and 321 DDFS events (4.2%) occurred. Osteoporosis was not associated with EFS or DDFS. Few EFS events occurred before the initiation of OPT, with no substantive evidence of a time-differing effect on outcomes (nonproportional hazards). OPT (yes vs no) was significantly associated with improved EFS (hazard ratio [HR] for yes vs no, 0.67; 95% confidence interval [CI], 0.57-0.80; P < .001) and DDFS (HR, 0.57; 95% CI, 0.44-0.73; P <. 001). Time-differing (time-dependent) OPT was not (EFS; P = .45). OPT did not alter the incidence of visceral-only metastasis (P = .31). CONCLUSIONS Oral OPT, administered to postmenopausal breast cancer patients receiving adjuvant AI therapy, was associated with improved EFS and DDFS; the time of OPT initiation (a time-dependent effect) did not affect the outcome. OPT did not alter the risk of visceral metastasis. Cancer 2017;123:2444-51. © 2017 American Cancer Society.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Medical Oncology

UniBE Contributor:

Rabaglio, Manuela

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0008-543X

Publisher:

John Wiley & Sons

Language:

English

Submitter:

Nicole Corminboeuf

Date Deposited:

20 Feb 2018 10:46

Last Modified:

22 Oct 2019 18:46

Publisher DOI:

10.1002/cncr.30682

PubMed ID:

28464211

Uncontrolled Keywords:

adjuvant breast cancer aromatase inhibitor bisphosphonate breast cancer clinical outcome osteoporosis osteoporosis therapy

BORIS DOI:

10.7892/boris.111494

URI:

https://boris.unibe.ch/id/eprint/111494

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