Trial Outcomes & Findings for Efficacy and Safety of Ribociclib in Pre- and Postmenopausal Chinese Women With HR Positive, HER2-negative, Advanced Breast Cancer. (NCT NCT03671330)

The study was conducted in 24 centers in China.

Efficacy and Safety of Ribociclib in Pre- and Postmenopausal Chinese Women With HR Positive, HER2-negative, Advanced Breast Cancer.

Progression-free survival (PFS) was defined as the time from randomization to the first documented disease progression or death from any cause. PFS was assessed by local investigators based on tumor evaluations using RECIST version 1.1 criteria. Patients who had not experienced progression or death by the analysis cut-off date of 25 April 2022 were censored at the date of their last adequate tumor assessment prior to that cut-off.

Venous whole blood samples were collected for activity-based pharmacokinetic characterization. The maximum plasma concentration (Cmax) was listed and summarized using descriptive statistics. Actual sampling times were taken into consideration for the pharmacokinetic analysis.

Venous whole blood samples were collected for activity-based pharmacokinetic characterization. The time to reach maximum plasma concentration (Tmax) was listed and summarized using descriptive statistics. Actual sampling times were taken into consideration for the pharmacokinetic analysis.

Venous whole blood samples were collected for activity-based pharmacokinetic characterization. The area under the concentration-time curve from time zero to 24 hours post-dose (AUC₀-₂₄h) was listed and summarized using descriptive statistics. Actual sampling times were taken into consideration for the pharmacokinetic analysis.

Overall Survival (OS) was defined as the time from date of first dose to date of death due to any cause. If a participant was not known to have died, then OS was censored at the latest date the participant was known to be alive (on or before the cut-off date).

Overall Response Rate (ORR) was defined as the proportion of participants with best overall response (BOR) of complete response (CR) or partial response (PR) by Investigator assessment as per RECIST 1.1 criteria: * CR = Disappearance of all non-nodal target lesions. In addition, any pathological lymph nodes assigned as target lesions must have a reduction in short axis to \< 10 mm. * PR = At least a 30% decrease in the sum of diameter of all target lesions, taking as reference the baseline sum of diameters.

Clinical Benefit Rate (CBR) was defined as the proportion of patients achieving a complete response (CR) or partial response (PR) per RECIST 1.1 criteria, or stable disease (SD) lasting at least 24 weeks, based on Investigator assessment using RECIST 1.1 criteria: * CR = Disappearance of all non-nodal target lesions. In addition, any pathological lymph nodes assigned as target lesions must have a reduction in short axis to \< 10 mm. * PR = At least a 30% decrease in the sum of diameter of all target lesions, taking as reference the baseline sum of diameters. * SD = Neither sufficient shrinkage to qualify for PR or CR nor an increase in lesions which would qualify for Progressive Disease (PD).

Time to Response (TTR) was defined as the duration from randomization to the first documented evidence of either a complete response (CR) (the disappearance of all target and non-target lesions) or a partial response (PR) (at least a 30% reduction in the sum of the longest diameters of target lesions from baseline) as assessed by the investigator.

Duration of Response (DoR) only applies to participants whose Best Overall Response (BOR) was complete response (CR) or partial response (PR) according to RECIST 1.1 based on tumor response data per local review. The start date is the date of first documented response of CR or PR (i.e. the start date of response, not the date when response was confirmed), and the end date is defined as the date of the first documented progression or death due to any cause. Participants continuing without progression or death were censored at the date of their last adequate tumor assessment.

Time to definitive deterioration in ECOG performance status was defined as the time from the date of randomization to the date when ECOG performance status had definitively deteriorated by at least 1 category compared with baseline. Deterioration was considered definitive if there was no subsequent improvement in ECOG performance status back to the baseline category or above. The ECOG performance status scale assesses a patient's functional level, ranging from 0 (fully active) to 5 (dead). Patients were censored if no definitive deterioration in ECOG performance status was observed before the first to occur between: (i) the analysis cut-off date, and (ii) the date when a new anti-neoplastic therapy was started. The censoring date was the date of the last performance status assessment prior to cut-off/start of new anti-neoplastic therapy. Time to definitive deterioration of ECOG performance status from baseline was estimated by using the Kaplan-Meier method.