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Updated: Jul 23, 2025
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Evaluating the Effectiveness of Cancer Drug Sensitization In Vitro and In Vivo
Published on: February 6, 2015
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Quantitative Assessment of Ribociclib Exposure-Response Relationship to Justify Dose Regimen in Patients with
Yan Ji1, Christelle Darstein2, Shu Yang1
1Novartis Pharmaceuticals Corporation, East Hanover, NJ, USA.
Journal of Clinical Pharmacology
|July 19, 2023
Summary
Ribociclib with endocrine therapy improves survival in advanced breast cancer. Dose adjustments effectively manage side effects like neutropenia and QT prolongation, maintaining treatment efficacy.
Area of Science:
- Oncology
- Pharmacology
- Clinical Trials
Background:
- Ribociclib combined with endocrine therapy (ET) is approved for HR+/HER2- advanced breast cancer (ABC).
- This combination has shown significant overall survival (OS) benefits in multiple Phase 3 trials.
Purpose of the Study:
- To analyze pharmacokinetic (PK), safety, and efficacy data of ribociclib in ABC.
- To justify the recommended dose regimen and dose modification strategy for ribociclib.
Main Methods:
- Pooled analysis of data from Phase 1-3 clinical studies.
- Characterization of exposure-response relationships for efficacy (PFS, OS) and safety (neutropenia, QT prolongation).
Main Results:
- No clear exposure-efficacy relationship was observed for progression-free survival (PFS) or OS.
- Dose reductions to 400 mg and 200 mg maintained patient benefit.
- Neutropenia and QT prolongation are linked to ribociclib exposure and manageable via dose modification.
Conclusions:
- The starting dose of 600 mg ribociclib is supported, along with dose reductions.
- Individualized dose modification effectively manages safety concerns while preserving efficacy in HR+/HER2- ABC patients.
- Quantitative exposure-response assessment is valuable for optimizing oncology drug dosing.
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