Adding ovarian suppression to tamoxifen for premenopausal breast cancer: A randomized phase III trial

Hyun Ah Kim, Jong Won Lee, Seok Jin Nam, Byeong Woo Park, Seock Ah Im, Eun Sook Lee, Yong Sik Jung, Jung Han Yoon, Sung Soo Kang, Soo Jung Lee, Kyong Hwa Park, Joon Jeong, Se Heon Cho, Sung Yong Kim, Lee Su Kim, Byung In Moon, Min Hyuk Lee, Tae Hyun Kim, Chanheun Park, Sung Hoo JungGeumhee Gwak, Jeryong Kim, Sun Hee Kang, Young Woo Jin, Hee Jeong Kim, Se Hwan Han, Wonshik Han, Min Hee Hur, Woo Chul Noh

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


PURPOSE The addition of ovarian function suppression (OFS) for 5 years to tamoxifen (TAM) for treatment of premenopausal patients with breast cancer after completion of chemotherapy has beneficial effects on diseasefree survival (DFS). This study evaluated the efficacy of adding 2 years of OFS to TAM in patients with hormone receptor-positive breast cancer who remain in a premenopausal state or resume ovarian function after chemotherapy. PATIENTS AND METHODS We enrolled 1,483 premenopausal women (age ≤ 45 years) with estrogen receptor- positive breast cancer treated with definitive surgery after completing adjuvant or neoadjuvant chemotherapy. Ovarian function was assessed every 6 months for 2 years since enrollment on the basis of follicular-stimulating hormone levels and vaginal bleeding history. If ovarian function was confirmed to be premenopausal at each visit, the patient was randomly assigned to complete 5 years of TAM alone (TAM-only) group or 5 years of TAM with OFS for 2 years that involved monthly goserelin administration (TAM + OFS) group. DFS was defined from the time of enrollment to the time of the first event. RESULTS A total of 1,293 patients were randomly assigned, and 1,282 patients were eligible for analysis. The estimated 5-year DFS rate was 91.1% in the TAM + OFS group and 87.5% in the TAM-only group (hazard ratio, 0.69; 95% CI, 0.48 to 0.97; P = .033). The estimated 5-year overall survival rate was 99.4% in the TAM + OFS group and 97.8% in the TAM-only group (hazard ratio, 0.31; 95% CI, 0.10 to 0.94; P = .029). CONCLUSION The addition of 2 years of OFS to TAM significantly improved DFS compared with TAM alone in patients who remained premenopausal or resumed ovarian function after chemotherapy.

Original languageEnglish
Pages (from-to)434-443
Number of pages10
JournalJournal of Clinical Oncology
Issue number5
StatePublished - 10 Feb 2020

Bibliographical note

Publisher Copyright:
© 2019 by American Society of Clinical Oncology.


Dive into the research topics of 'Adding ovarian suppression to tamoxifen for premenopausal breast cancer: A randomized phase III trial'. Together they form a unique fingerprint.

Cite this