Phase I dose-escalation study to determine the safety, tolerability, preliminary efficacy and pharmacokinetics of an intratumoral injection of tigilanol tiglate (EBC-46)

Benedict J. Panizza, Paul de Souza, Adam Cooper, Aflah Roohullah, Christos S. Karapetis, Jason D. Lickliter

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Background: Tigilanol tiglate, a short-chain diterpene ester, is being developed as intratumoral treatment of a broad range of cancers. We conducted the first-in-human study of intratumoral tigilanol tiglate in patients with solid tumors. Methods: Tigilanol tiglate was administered in a multicentre, non randomized, single-arm study, with escalating doses beginning with 0·06 mg/m2 in tumors estimated to be at least twice the volume of injection (dose-escalation cohorts). Patients with smaller tumors were assigned to the local effects cohort and received the appropriate dose for tumor size. Findings: Twenty-two patients were enrolled. The maximum dose was 3·6 mg/m2 and the maximum tolerated dose was not reached. There was one report of dose-limiting toxicity (upper airway obstruction), two serious adverse events (upper airway obstruction and septicemia), 160 treatment-emergent adverse events, and no deaths. Injection site reactions in all tumors and tumor types occurred even at the lowest dose. Six of the 22 patients experienced a treatment response, with four of the six patients achieving complete response. Interpretation: Intratumoral tigilanol tiglate was generally well tolerated, the maximum tolerated dose was not reached, and clinical activity was observed in 9 tumor types including complete response in four patients. These results support the continued development of tigilanol tiglate for intratumoral administration. Funding: QBiotics Group Limited Brisbane, Queensland, Australia was the sponsor of the study.

    Original languageEnglish
    Pages (from-to)433-441
    Number of pages9
    JournalEBioMedicine
    Volume50
    DOIs
    Publication statusPublished - Dec 2019

    Keywords

    • Diterpene ester
    • EBC-46
    • Intratumoral
    • Protein kinase C
    • Tigilanol tiglate

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