Study of 2 Ribociclib Doses in Combination With Aromatase Inhibitors in Women With HR+, HER2- Advanced Breast Cancer

Summary

The purpose of the study was to evaluate the safety and efficacy of a reduced ribociclib starting dose of 400 mg in combination with a non-steroidal aromatase inhibitor (NSAI) (letrozole or anastrozole) for the treatment of pre- and postmenopausal women with hormone receptor-positive (HR-positive), HER2-negative advanced breast cancer (aBC) who have received no prior therapy for advanced disease. Premenopausal women were required to receive goserelin in both treatment arms.

Timeline

Start

2019-06-11

Primary completion

2021-06-11

Completion

2024-08-30

Outcome

Missed primary endpoint

paper The AMALEE randomized clinical trial did not demonstrate ORR noninferiority of ribociclib, 400 mg vs ribociclib, 600 mg, with comparable DOR and PFS between doses. PMID 40996770 ↗

Publications

• Ji Y, Wang C, Combes FP, Ho YY, Fasching PA, Untch M, Zarate JP, Crown J. Quantitative Pharmacology Justifying Ribociclib Dose in Early Breast Cancer. Clin Pharmacokinet. 2026 Jun 23. doi: 10.1007/s40262-026-01643-3. Online ahead of print.
• Cardoso F, Jacot W, Kuemmel S, Gupta S, Cruz F, Balaraman R, Ferreira A, Ahola T, Chapko Y, Zhukova L, Chiang W, Li Z, Ji Y, Kaakiou N, Bolotova N, Sparano JA. 600- vs 400-mg First-Line Ribociclib in Hormone Receptor-Positive/ERBB2-Negative Advanced Breast Cancer: The AMALEE Randomized Clinical Trial. JAMA Oncol. 2025 Nov 1;11(11):1356-1363. doi: 10.1001/jamaoncol.2025.3687.

Drugs

Indications