Volume 3 Supplement 2

30th Annual Meeting and Associated Programs of the Society for Immunotherapy of Cancer (SITC 2015)

Open Access

Phase I study of patients with non-muscle invasive bladder cancer (NMIBC) treated with vesigenurtacel-L (HS-410) after Bacillus Calmette-Guérin (BCG)

  • Gary Steinberg1,
  • Neal Shore2,
  • Lawrence Karsh3,
  • James Bailen4,
  • Michael Woods5,
  • Taylor Schreiber6 and
  • Melissa Price6
Journal for ImmunoTherapy of Cancer20153(Suppl 2):P447

DOI: 10.1186/2051-1426-3-S2-P447

Published: 4 November 2015

Background

Vesigenurtacel-L (HS-410), consists of an allogeneic bladder cancer cell line, selected for high expression of a series of tumor antigens that are known to be shared by a high proportion of bladder tumors. The cell line secretes gp96-Ig, a modified heat shock protein which delivers cell-derived antigens to MHC-I via the cross-presentation pathway, leading to preferential activation of CD8+ cytotoxic T cells. Vesigenurtacel-L was evaluated in a Phase I trial after treatment with standard of care induction BCG for safety and immune response.

Methods

Ten patients with non-muscle invasive bladder cancer who had undergone TURBT, were judged to be at an increased risk for recurrence, and were either BCG naïve or had completed previous BCG treatment >12 months prior to the most recent TURBT were treated with induction BCG as standard of care and enrolled in the trial. Patients received up to 15 doses of monotherapy vesigenurtacel-L at a dose of 106 cells per dose, weekly for 12 weeks followed by 3 monthly doses. Baseline tumor tissue and any follow up biopsies were evaluated by immunohistochemistry for tumor infiltrating lymphocytes and expression of PD-L1.

Results

Vesigenurtacel-L was well tolerated with no treatment-related Grade 3/4 adverse events. The most common adverse events were low-grade injection site reactions consistent with delayed type hypersensitivity. Peripheral blood mononuclear cells were evaluated by flow cytometry for detection of circulating leukocyte subsets, regulatory T cells, myeloid derived suppressor cells, activated T cells and expression of immune checkpoint molecules on T cells. Additionally, analyses from pre- and post-treatment tissue specimens in a subset of patients including antigen expression, evaluation of tumor-infiltrating lymphocytes, PD-L1 expression and T cell receptor sequencing will be reported, and their extrapolation to an emerging definition of responder phenotype discussed. For example, tissue analysis indicates an increase in CD8+ T cells in the bladder after treatment, consistent with the mechanism of action derived from preclinical models, and this change appears be correlated to clinical outcome.

Trial registration

Clinical trial information: NCT02010203.

Authors’ Affiliations

(1)
University of Chicago Medical Center
(2)
Atlantic Urology Clinics
(3)
The Urology Center of Colorado
(4)
First Urology
(5)
The University of North Carolina at Chapel Hill
(6)
Heat Biologics, Inc.

Copyright

© Steinberg et al. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Advertisement