Clinical behavior of recurrent hormone receptor-positive breast cancer by adjuvant endocrine therapy within the Breast International Group 1-98 clinical trial.

Leone, Jose P; Cole, Bernard F; Regan, Meredith M; Thürlimann, Beat; Coates, Alan S; Rabaglio, Manuela; Giobbie-Hurder, Anita; Gelber, Richard D; Ejlertsen, Bent; Harvey, Vernon J; Neven, Patrick; Láng, Istvan; Bonnefoi, Herve; Wardley, Andrew; Goldhirsch, Aron; Di Leo, Angelo; Colleoni, Marco; Vaz-Luis, Ines; Lin, Nancy U (2021). Clinical behavior of recurrent hormone receptor-positive breast cancer by adjuvant endocrine therapy within the Breast International Group 1-98 clinical trial. Cancer, 127(5), pp. 700-708. Wiley 10.1002/cncr.33318

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BACKGROUND

Endocrine therapy resistance is a major cause of distant recurrence (DR) in hormone receptor-positive breast cancer. This study evaluated differences in survival after DR in patients treated with different adjuvant endocrine therapy regimens in the Breast International Group (BIG) 1-98 trial.

METHODS

BIG 1-98 compared 5 years of adjuvant treatment among 4 arms: tamoxifen (T), letrozole (L), tamoxifen followed by letrozole (TL), and letrozole followed by tamoxifen (LT). After a median follow-up of 8.1 years, 911 of 8010 patients (T, 302; L, 285; TL, 170; and LT, 154) had DR as the site of first recurrence. Univariate and multivariate Cox analyses were performed to determine features associated with post-DR survival.

RESULTS

The median follow-up time after DR was 59 months (interquartile range, 29-88 months). Among all patients with DR, 38.1% were 65 years old or older at enrollment, 61.9% had tumors larger than 2 cm, and 69.7% were node positive. Neoadjuvant or adjuvant chemotherapy was administered to 35.6% of the patients. There was no difference in post-DR survival by treatment arm (median survival, 20.8 months for T, 17.9 months for L, 17.3 months for TL, and 20.8 months for LT; P = .21). In multivariate analysis, older patients (hazard ratio [HR], 1.35; 95% confidence interval [CI], 1.15-1.59) and patients with tumors larger than 2 cm (HR, 1.19; 95% CI, 1.00-1.41), 4 or more positive nodes (HR, 1.31; 95% CI, 1.05-1.64), progesterone receptor (PR)-negative tumors (HR, 1.25; 95% CI, 1.02-1.52), or shorter disease-free survival (DFS) had significantly worse post-DR survival.

CONCLUSIONS

Treatment with adjuvant T, L, or their sequences was not associated with differences in survival after DR. Significant differences in survival were observed by age, primary tumor size, nodal and PR status, and DFS, and this suggests that traditional baseline high-risk features remain prognostic in the metastatic setting.

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:

1097-0142

Publisher:

Wiley

Language:

English

Submitter:

Rebeka Gerber

Date Deposited:

19 Jan 2021 10:45

Last Modified:

21 Feb 2021 01:36

Publisher DOI:

10.1002/cncr.33318

PubMed ID:

33290610

Uncontrolled Keywords:

breast cancer clinical trial distant recurrence hormone therapy survival

BORIS DOI:

10.48350/150359

URI:

https://boris.unibe.ch/id/eprint/150359

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