Journal
CANCER LETTERS
Volume 371, Issue 2, Pages 161-170Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2015.11.036
Keywords
Neuroblastoma; Oncolytic virotherapy; Mesenchymal stem cells; Immune response; Cell migration
Categories
Funding
- Fondo de Investigaciones Sanitarias [PI08/0029, PI14CIII/00005, PI13/02487, EC11-061, EC07/90591]
- Madrid Regional Government [S-BIO-0204-2006, P2010/BMD-2420]
- Asociacion Pablo Ugarte
- Asociacion NEN
- RTICC [RD12/0036/0027]
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We report here our clinical experience of a program of compassionate use of Celyvir - autologous marrow derived mesenchymal stem cells (MSCs) carrying an oncolytic adenovirus - for treating children with advanced metastatic neuroblastoma. Children received weekly doses of Celyvir with no concomitant treatments. The tolerance was excellent, with very mild and self-limited viral-related symptoms. Patients could be distinguished based on their response to therapy: those who had a clinical response (either complete, partial or stabilization) and those who did not respond. We found differences between patients who responded versus those who did not when analyzing their respective MSCs, at the expression levels of adhesion molecules (CCR1, CXCR1 and CXCR4) and in migration capacities in transwell assays, and in immune-related molecules (IFN gamma, HLA-DR). These results suggest interpatient differences in the homing and immune modulation capacities of the therapy administered. In addition, the pretherapy immune T cell status and the T effector response were markedly different between responders and non-responders. We conclude that multidoses of Celyvir have an excellent safety profile in children with metastatic neuroblastoma. Intrinsic patients' and MSCs' factors appear to be related to clinical outcome. (C) 2015 Elsevier Ireland Ltd. All rights reserved.
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