A Phase 1b Study Evaluating the Safety, Tolerability, and Immunogenicity of CMB305, a Lentiviral-Based Prime-Boost Vaccine Regimen, in Patients with Locally Advanced, Relapsed, or Metastatic Cancer Expressing NY-ESO-1

Neeta Somaiah, Sant P. Chawla, Matthew S. Block, John C. Morris, Khanh Do, Joseph W. Kim, Mihaela Druta, Kamalesh K. Sankhala, Patrick Hwu, Robin L. Jones, Sacha Gnjatic, Seunghee Kim-Schulze, Kevin Tuballes, Mahlet Yishak, Hailing Lu, Adam Yakovich, Jan Ter Meulen, Michael Chen, Richard T. Kenney, Chet BohacSeth M. Pollack

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Preclinical data suggest that a “prime-boost” vaccine regimen using a target-expressing lentiviral vector for priming, followed by a recombinant protein boost, may be effective against cancer; however, this strategy has not been evaluated in a clinical setting. CMB305 is a prime-boost vaccine designed to induce a broad anti-NY-ESO-1 immune response. It is composed of LV305, which is an NY-ESO-1 expressing lentiviral vector, and G305, a recombinant adjuvanted NY-ESO-1 protein. This multicenter phase 1b, first-in-human trial evaluated CMB305 in patients with NY-ESO-1 expressing solid tumors. Safety was examined in a 3 + 3 dose-escalation design, followed by an expansion with CMB305 alone or in a combination with either oral metronomic cyclophosphamide or intratumoral injections of a toll-like receptor agonist (glucopyranosyl lipid A). Of the 79 patients who enrolled, 81.0% had sarcomas, 86.1% had metastatic disease, and 57.0% had progressive disease at study entry. The most common adverse events were fatigue (34.2%), nausea (26.6%), and injection-site pain (24.1%). In patients with soft tissue sarcomas, a disease control rate of 61.9% and an overall survival of 26.2 months (95% CI, 22.1–NA) were observed. CMB305 induced anti-NY-ESO-1 antibody and T-cell responses in 62.9% and 47.4% of patients, respectively. This is the first trial to test a prime-boost vaccine regimen in patients with advanced cancer. This approach is feasible, can be delivered safely, and with evidence of immune response as well as suggestion of clinical benefit.

Original languageEnglish (US)
Article number1847846
JournalOncoImmunology
Volume9
Issue number1
DOIs
StatePublished - Jan 1 2020

Keywords

  • G305
  • immunotherapy
  • lentivirus
  • LV305
  • myxoid liposarcoma
  • NY-ESO-1
  • prime-boost
  • synovial sarcoma
  • vaccine

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Oncology

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