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STP355
- Development stage
- Preclinical
- Lead developer
- Sirnaomics
- Modality
- Chemically Modified siRNA → Small Interfering RNA (siRNA) → Small RNA Therapeutics → RNA Therapeutics → Nucleic Acid Therapeutics, Nanoparticles → Drug Delivery Systems, Conjugated siRNA → Small Interfering RNA (siRNA) → Small RNA Therapeutics → RNA Therapeutics → Nucleic Acid Therapeutics
- Administration
- Intravenous
01
Overview
**STP355** is a Sirnaomics investigational dual-siRNA nanoparticle therapy for solid tumors, including breast cancer, melanoma, and colorectal cancer. It co-formulates siRNAs designed to silence **transforming growth factor beta-1** and **vascular endothelial growth factor receptor 2** expression in a proprietary polypeptide nanoparticle delivery platform, with the goal of simultaneously reducing immunosuppressive tumor-microenvironment signaling and tumor angiogenesis. Preclinical melanoma studies reported intravenous administration, dual-target knockdown, reduced tumor growth and lung metastasis, and increased immune-cell penetration into tumors. ([sirnaomics.com](https://sirnaomics.com/en/science-pipeline/pipeline/oncology/stp355))
- Other names
- STP 355STP355STP-355
02
Targets
Vascular endothelial growth factor receptor 2 (VEGFR2) messenger RNA
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