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Dehner CA, Bell RC, Cao Y, He K, Chrisinger JS, Armstrong AE, Yohe M, Shern J, Hirbe AC. Loss of Chromosome 3q Is a Prognostic Marker in Fusion-Negative Rhabdomyosarcoma. JCO Precis Oncol 2023; 7:e2300037. [PMID: 37738543 PMCID: PMC10861018 DOI: 10.1200/po.23.00037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 06/05/2023] [Accepted: 07/16/2023] [Indexed: 09/24/2023] Open
Abstract
PURPOSE Soft tissue sarcomas (STS) are rare mesenchymal neoplasms that frequently show complex chromosomal aberrations such as amplifications or deletions of DNA sequences or even whole chromosomes. We recently found that gain of chromosome (chr) 8 is associated with worse overall survival (OS) in STS as a group. We therefore aimed to investigate the overall copy number profile of rhabdomyosarcoma (RMS) to evaluate for prognostic signatures. METHODS Fluorescence in situ hybridization (FISH) testing was performed on a cohort of STS to assess for chr8 gain. Copy number variation (CNV) data from the National Cancer Institute were analyzed to assess for prognostically significant CNV aberrations in FOXO1 fusion-negative (FN)- versus fusion-positive (FP)-RMS. FISH testing was performed on a cohort of FN-RMS to assess for chr3q loss and correlate with outcomes. RESULTS Chr8 gain is a highly prevalent CNV in embryonal RMS and shows slightly improved prognosis. Meanwhile, loss of chr3q was associated with worse outcome in FN-RMS compared with FP-RMS. CONCLUSION The pathogenesis of STS including FN-RMS remains poorly understood, emphasizing the need for new therapeutic advances and adequate risk stratification. Our data demonstrate that loss of chr3q is associated with poor OS in FN-RMS, supporting it as an important tool for risk stratification.
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Affiliation(s)
- Carina A. Dehner
- Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO
- Department of Pathology/Dermatopathology, Indiana University, Indianapolis, IN
| | - Robert C. Bell
- Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO
- Department of Pathology, University of Michigan, Ann Arbor, MI
| | - Yang Cao
- Division of Oncology, Washington University School of Medicine, St Louis, MO
| | - Kevin He
- Division of Oncology, Washington University School of Medicine, St Louis, MO
| | - John S.A. Chrisinger
- Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO
| | - Amy E. Armstrong
- Division of Pediatric Hematology/Oncology, Washington University School of Medicine, St Louis, MO
| | - Marielle Yohe
- Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD
| | - Jack Shern
- Center for Cancer Research, National Cancer Institute, Bethesda, MD
| | - Angela C. Hirbe
- Division of Oncology, Washington University School of Medicine, St Louis, MO
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Rogers LC, Kremer JC, Brashears CB, Lin Z, Hu Z, Bastos AC, Baker A, Fettig N, Zhou D, Shoghi KI, Dehner CA, Chrisinger JS, Bomalaski JS, Garcia BA, Oyama T, White EP, Van Tine BA. Discovery and Targeting of a Noncanonical Mechanism of Sarcoma Resistance to ADI-PEG20 Mediated by the Microenvironment. Clin Cancer Res 2023; 29:3189-3202. [PMID: 37339179 PMCID: PMC10425734 DOI: 10.1158/1078-0432.ccr-22-2642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 04/11/2023] [Accepted: 06/15/2023] [Indexed: 06/22/2023]
Abstract
PURPOSE Many cancers lack argininosuccinate synthetase 1 (ASS1), the rate-limiting enzyme of arginine biosynthesis. This deficiency causes arginine auxotrophy, targetable by extracellular arginine-degrading enzymes such as ADI-PEG20. Long-term tumor resistance has thus far been attributed solely to ASS1 reexpression. This study examines the role of ASS1 silencing on tumor growth and initiation and identifies a noncanonical mechanism of resistance, aiming to improve clinical responses to ADI-PEG20. EXPERIMENTAL DESIGN Tumor initiation and growth rates were measured for a spontaneous Ass1 knockout (KO) murine sarcoma model. Tumor cell lines were generated, and resistance to arginine deprivation therapy was studied in vitro and in vivo. RESULTS Conditional Ass1 KO affected neither tumor initiation nor growth rates in a sarcoma model, contradicting the prevalent idea that ASS1 silencing confers a proliferative advantage. Ass1 KO cells grew robustly through arginine starvation in vivo, while ADI-PEG20 remained completely lethal in vitro, evidence that pointed toward a novel mechanism of resistance mediated by the microenvironment. Coculture with Ass1-competent fibroblasts rescued growth through macropinocytosis of vesicles and/or cell fragments, followed by recycling of protein-bound arginine through autophagy/lysosomal degradation. Inhibition of either macropinocytosis or autophagy/lysosomal degradation abrogated this growth support effect in vitro and in vivo. CONCLUSIONS Noncanonical, ASS1-independent tumor resistance to ADI-PEG20 is driven by the microenvironment. This mechanism can be targeted by either the macropinocytosis inhibitor imipramine or the autophagy inhibitor chloroquine. These safe, widely available drugs should be added to current clinical trials to overcome microenvironmental arginine support of tumors and improve patient outcomes.
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Affiliation(s)
- Leonard C. Rogers
- Division of Medical Oncology, Washington University in St. Louis, St. Louis, Missouri
| | - Jeff C. Kremer
- Division of Medical Oncology, Washington University in St. Louis, St. Louis, Missouri
| | - Caitlyn B. Brashears
- Division of Medical Oncology, Washington University in St. Louis, St. Louis, Missouri
| | - Zongtao Lin
- Department of Biochemistry and Molecular Biophysics, Washington University in St. Louis, St. Louis, Missouri
| | - Zhixian Hu
- Rutgers Cancer Institute of New Jersey, New Brunswick, New Jersey
| | - Alliny C.S. Bastos
- Division of Medical Oncology, Washington University in St. Louis, St. Louis, Missouri
| | - Adriana Baker
- Division of Medical Oncology, Washington University in St. Louis, St. Louis, Missouri
| | - Nicole Fettig
- Department of Radiology, Washington University in St. Louis School of Medicine, St. Louis, Missouri
| | - Dong Zhou
- Department of Radiology, Washington University in St. Louis School of Medicine, St. Louis, Missouri
| | - Kooresh I. Shoghi
- Department of Radiology, Washington University in St. Louis School of Medicine, St. Louis, Missouri
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, Missouri
| | - Carina A. Dehner
- Department of Pathology and Immunology, Washington University in St. Louis School of Medicine, St. Louis, Missouri
| | - John S.A. Chrisinger
- Department of Pathology and Immunology, Washington University in St. Louis School of Medicine, St. Louis, Missouri
| | | | - Benjamin A. Garcia
- Department of Biochemistry and Molecular Biophysics, Washington University in St. Louis, St. Louis, Missouri
| | - Toshinao Oyama
- Division of Medical Oncology, Washington University in St. Louis, St. Louis, Missouri
| | - Eileen P. White
- Rutgers Cancer Institute of New Jersey, New Brunswick, New Jersey
- Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey
| | - Brian A. Van Tine
- Division of Medical Oncology, Washington University in St. Louis, St. Louis, Missouri
- Division of Pediatric Hematology/Oncology, St. Louis Children's Hospital, St. Louis, Missouri
- Siteman Cancer Center, St. Louis, Missouri
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