Clinical experiences with systemically administered siRNA-based therapeutics in cancer
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Updated: Mar 30, 2026

Preparation of Neutrally-charged, pH-responsive Polymeric Nanoparticles for Cytosolic siRNA Delivery
Published on: May 2, 2019
Jonathan E Zuckerman1, Mark E Davis2
1Department of Pathology and Laboratory Medicine, University of California Los Angeles, Los Angeles, California 90095, USA.
Abstract:
Small interfering RNA (siRNA)-based therapies are emerging as a promising new anticancer approach, and a small number of Phase I clinical trials involving patients with solid tumours have now been completed. Encouraging results from these pioneering clinical studies show that these new therapeutics can successfully and safely inhibit targeted gene products in patients with cancer, and have taught us important lessons regarding appropriate dosages and schedules. In this Review, we critically assess these Phase I studies and discuss their implications for future clinical trial design. Key challenges and future directions in the development of siRNA-containing anticancer therapeutics are also considered.
Insights
Small interfering RNA (siRNA) therapies show promise for treating solid tumors. Early clinical trials demonstrate safety and efficacy in inhibiting gene targets, providing valuable insights for future cancer treatment development.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Small interfering RNA (siRNA)-based therapies represent a novel approach in cancer treatment.
- Early-stage clinical trials have been conducted for patients with solid tumors.
Purpose of the Study:
- To critically assess Phase I clinical studies of siRNA-based anticancer therapies.
- To discuss implications for future clinical trial design and development.
Main Methods:
- Review of completed Phase I clinical trials involving siRNA therapeutics for solid tumors.
- Analysis of safety, efficacy, dosage, and scheduling from trial data.
Main Results:
- Phase I trials indicate that siRNA therapeutics can safely and effectively inhibit targeted gene products in cancer patients.
- Pioneering studies have provided crucial information on appropriate dosing and treatment schedules.
Conclusions:
- siRNA-based therapies are a promising anticancer strategy with demonstrated safety and efficacy.
- Lessons learned from early trials are vital for optimizing future clinical development and overcoming challenges in siRNA therapeutics.
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