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Published in: BMC Cancer 1/2024

Open Access 01-12-2024 | Cytostatic Therapy | Research

Tretinoin improves the anti-cancer response to cyclophosphamide, in a model-selective manner

Authors: Caitlin M. Tilsed, M. Lizeth Orozco Morales, Rachael M. Zemek, Brianna A. Gordon, Matthew J. Piggott, Anna K. Nowak, Scott A. Fisher, Richard A. Lake, W. Joost Lesterhuis

Published in: BMC Cancer | Issue 1/2024

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Abstract

Background

Chemotherapy is included in treatment regimens for many solid cancers, but when administered as a single agent it is rarely curative. The addition of immune checkpoint therapy to standard chemotherapy regimens has improved response rates and increased survival in some cancers. However, most patients do not respond to treatment and immune checkpoint therapy can cause severe side effects. Therefore, there is a need for alternative immunomodulatory drugs that enhance chemotherapy.

Methods

We used gene expression data from cyclophosphamide (CY) responders and non-responders to identify existing clinically approved drugs that could phenocopy a chemosensitive tumor microenvironment (TME), and tested combination treatments in multiple murine cancer models.

Results

The vitamin A derivative tretinoin was the top predicted upstream regulator of response to CY. Tretinoin pre-treatment induced an inflammatory, interferon-associated TME, with increased infiltration of CD8 + T cells, sensitizing the tumor to subsequent chemotherapy. However, while combination treatment significantly improved survival and cure rate in a CD4+ and CD8+ T cell dependent manner in AB1-HA murine mesothelioma, this effect was model-selective, and could not be replicated using other cell lines.

Conclusions

Despite the promising data in one model, the inability to validate the efficacy of combination treatment in multiple cancer models deprioritizes tretinoin/cyclophosphamide combination therapy for clinical translation.
Appendix
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Metadata
Title
Tretinoin improves the anti-cancer response to cyclophosphamide, in a model-selective manner
Authors
Caitlin M. Tilsed
M. Lizeth Orozco Morales
Rachael M. Zemek
Brianna A. Gordon
Matthew J. Piggott
Anna K. Nowak
Scott A. Fisher
Richard A. Lake
W. Joost Lesterhuis
Publication date
01-12-2024
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2024
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-024-11915-5

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