ESMO 2022, 9-13 September, Paris

🡕 Abstract          ⤓ Poster

Phase Ia/Ib study of RS-0139, a novel tumor-targeted delivery of docetaxel, in patients with recurrent, locally advanced, or metastatic non-small cell lung cancer (NSCLC)

RS-0139 is the lead candidate of RS Research, a clinical-stage biotechnology start-up harvesting the superior therapeutic index that PDC Therapeutics’ SagittaTM platforms are ready to offer.


Hakan Sedat Orer


Annals of Oncology (2022) 33 (suppl_7): S448-S554. 10.1016/annonc/annonc1064


H.S. Orer1, G. Nomak2, B.O. Oksuzoglu3, R.S. Senturk4, Y. Eralp5, F.P. Yumuk6, H.S. Nomak7, R. Sanyal8


Docetaxel (DTX) is an anti-microtubule agent registered for multiple indications and is usually administered 3-weekly at doses of 60-100 mg/m2. Important limitations of DTX include acute hypersensitivity reactions, neutropenia, neuropathy, fatigue and nausea. RS-0139 is developed as a DTX-releasing, tumor-targeted prodrug. DTX is covalently bound to a polymer backbone, together with a targeting peptide, which shows high affinity to avb3, avb5 and avb6 integrin receptors highly expressed on tumor cell surface. Once RS-0139 is up-taken by the cell, the covalent bond is cleaved to release DTX in the cytoplasm. RS-0139 gains the investigational new drug status since DTX is covalently modified for the targeted treatment. The physical properties of RS-0139, pharmacokinetic profile and improved aqueous solubility may provide an advantage over the currently used taxanes. In preclinical studies, enzymatically cleavable covalent conjugation of DTX enabled sustained-release inside the tumor, reducing adverse effects due to limited circulating free DTX. Hence, RS-0139 showed superior tolerability than DTX in healthy animals. Besides, the dosing frequency decreased owing to the increased half-life. Preclinical data strongly support the clinical translation of this novel nanomedicine for the treatment of solid tumors.

Trial design

This is a phase Ia/Ib open-label, multicenter, dose-escalation and expansion study to evaluate the safety and tolerability of RS-0139 monotherapy in NSCLC. Patients who progressed after standard therapy are eligible for the study. In Phase Ia, patients receive RS-0139 (IV) at escalating doses (75-200 mg/m2). The protocol consists of an accelerated titration design until the recommended dose for Phase Ib is elicited and switched to standard 3+3 design in case of grade 2 toxicity. Phase Ib will be initiated following the determination of the recommended dose for RS-0139 upon evaluation of all available safety and PK data and 6 patients will receive 3 cycles in every 21 days. The primary endpoint is the determination of the MTD of RS-0139. The study is open for enrollment in 2 sites. Two of the planned 16 patients have been enrolled to date.

Clinical trial identification


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