RT Journal Article T1 Ribociclib with letrozole vs letrozole alone in elderly patients with hormone receptor-positive, HER2-negative breast cancer in the randomized MONALEESA-2 trial. A1 Sonke, Gabe S A1 Hart, Lowell L A1 Campone, Mario A1 Erdkamp, Frans A1 Janni, Wolfgang A1 Verma, Sunil A1 Villanueva, Cristian A1 Jakobsen, Erik A1 Alba, Emilio A1 Wist, Erik A1 Favret, Anne M A1 Bachelot, Thomas A1 Hegg, Roberto A1 Wheatley-Price, Paul A1 Souami, Farida A1 Sutradhar, Santosh A1 Miller, Michelle A1 Germa, Caroline A1 Burris, Howard A K1 Breast cancer K1 CDK inhibitor K1 Elderly K1 Endocrine therapy K1 Hormone receptor-positive K1 Ribociclib AB Determine the efficacy and safety of first-line ribociclib plus letrozole in elderly patients with HR+, HER2- advanced breast cancer. 668 postmenopausal women with HR+, HER2- advanced breast cancer and no prior systemic therapy for advanced disease were enrolled in the Phase III MONALEESA-2 trial (NCT01958021); 295 patients were aged ≥ 65 years. Patients were randomized to ribociclib (600 mg/day; 3-weeks-on/1-week-off) plus letrozole (2.5 mg/day) or placebo plus letrozole until disease progression, unacceptable toxicity, death, or treatment discontinuation. The primary endpoint was PFS, which was evaluated in elderly (≥ 65 years) and younger ( Ribociclib plus letrozole significantly improved PFS vs placebo plus letrozole in elderly (hazard ratio: 0.608; 95% CI 0.394-0.937) and younger patients (hazard ratio: 0.523; 95% CI 0.378-0.723). Overall response rates were numerically higher in the ribociclib vs placebo arm, regardless of age. Ribociclib plus letrozole was well tolerated in elderly patients, with the safety profile similar to the overall study population. Nausea, vomiting, alopecia, and diarrhea were > 10% more frequent in the ribociclib plus letrozole vs placebo plus letrozole arm in both subgroups; most events were grade 1/2. In elderly patients, grade 1/2 anemia and fatigue were > 10% more frequent in the ribociclib plus letrozole vs placebo plus letrozole arm and discontinuation rates were similar in both arms. Addition of ribociclib to letrozole is a valid therapeutic option for elderly patients with HR+, HER2- advanced breast cancer in the first-line setting. YR 2017 FD 2017-10-22 LK http://hdl.handle.net/10668/11714 UL http://hdl.handle.net/10668/11714 LA en DS RISalud RD Apr 9, 2025