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Kasago IS, Chatila WK, Lezcano CM, Febres-Aldana CA, Schultz N, Vanderbilt C, Dogan S, Bartlett EK, D'Angelo SP, Tap WD, Singer S, Ladanyi M, Shoushtari AN, Busam KJ, Hameed M. Undifferentiated and Dedifferentiated Metastatic Melanomas Masquerading as Soft Tissue Sarcomas: Mutational Signature Analysis and Immunotherapy Response. Mod Pathol 2023; 36:100165. [PMID: 36990277 PMCID: PMC10698871 DOI: 10.1016/j.modpat.2023.100165] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 03/13/2023] [Accepted: 03/17/2023] [Indexed: 03/29/2023]
Abstract
The distinction between undifferentiated melanoma (UM) or dedifferentiated melanoma (DM) from undifferentiated or unclassifiable sarcoma can be difficult and requires the careful correlation of clinical, pathologic, and genomic findings. In this study, we examined the utility of mutational signatures to identify patients with UM/DM with particular attention as to whether this distinction matters for treatment because the survival of patients with metastatic melanoma has dramatically improved with immunologic therapy, whereas durable responses are less frequent in sarcomas. We identified 19 cases of UM/DM that were initially reported as unclassified or undifferentiated malignant neoplasm or sarcoma and submitted for targeted next-generation sequencing analysis. These cases were confirmed as UM/DM by harboring melanoma driver mutations, UV signature, and high tumor mutation burden. One case of DM showed melanoma in situ. Meanwhile, 18 cases represented metastatic UM/DM. Eleven patients had a prior history of melanoma. Thirteen of 19 (68%) of the tumors were immunohistochemically completely negative for 4 melanocytic markers (S100, SOX10, HMB45, and MELAN-A). All cases harbored a dominant UV signature. Frequent driver mutations involved BRAF (26%), NRAS (32%), and NF1 (42%). In contrast, the control cohort of undifferentiated pleomorphic sarcomas (UPS) of deep soft tissue exhibited a dominant aging signature in 46.6% (7/15) without evidence of UV signature. The median tumor mutation burden for DM/UM vs UPS was 31.5 vs 7.0 mutations/Mb (P < .001). A favorable response to immune checkpoint inhibitor therapy was observed in 66.6% (12/18) of patients with UM/DM. Eight patients exhibited a complete response and were alive with no evidence of disease at the last follow-up (median 45.5 months). Our findings support the usefulness of the UV signature in discriminating DM/UM vs UPS. Furthermore, we present evidence suggesting that patients with DM/UM and UV signatures can benefit from immune checkpoint inhibitor therapy.
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Affiliation(s)
- Israel S Kasago
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Walid K Chatila
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Cecilia M Lezcano
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | | | - Nikolaus Schultz
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Chad Vanderbilt
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Snjezana Dogan
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Edmund K Bartlett
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Sandra P D'Angelo
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - William D Tap
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Samuel Singer
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Marc Ladanyi
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York; Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | | | - Klaus J Busam
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Meera Hameed
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York.
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Ferrer FA. EDITORIAL COMMENT. Urology 2020; 137:176-177. [DOI: 10.1016/j.urology.2019.11.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 11/21/2019] [Indexed: 10/24/2022]
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The decreased metastatic potential of rhabdomyosarcoma cells obtained through MET receptor downregulation and the induction of differentiation. Cell Death Dis 2013; 4:e459. [PMID: 23328666 PMCID: PMC3563987 DOI: 10.1038/cddis.2012.199] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Rhabdomyosarcoma (RMS) is the most common type of pediatric soft tissue sarcoma. The MET receptor has an important role in the biology of RMS, and its overexpression and hyperactivation correlate with the metastatic ability of RMS. Consequently, interfering with MET expression or functionality may constitute a sound strategy for reducing the progression and metastatic potential of RMS. Our study reveals that downregulation of the MET receptor leads to changes in the morphology of ARMS cell in vivo. Tumors acquire a spindle shape that is characteristic of muscle fibers. Inhibition of MET expression or function leads to (i) a decreased expression of the early myogenic marker MyoD, (ii) a decreased ability of ARMS cells to metastasize to bone marrow cavities, (iii) downregulation of CXCR4 receptor expression and (iv) a decreased migration of MET-depleted cells towards gradients of HGF and SDF-1. Finally, we demonstrate that in vitro differentiation of alveolar RMS cells decreases their metastatic behavior by reducing both the expression of the MET and CXCR4 receptors and their migratory response to HGF and SDF-1. These findings suggest that blockers of MET receptor function and inducers of RMS cells differentiation may be clinically useful for reducing the aggressiveness and metastatic potential of RMS and may have significant implications for its treatment.
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Abstract
Soft tissue sarcomas in children are rare. Approximately 850 to 900 children and adolescents are diagnosed each year with rhabdomyosarcoma (RMS) or a non-RMS soft tissue sarcoma (NRSTS). RMS is more common in children 14 years old and younger and NRSTS in adolescents and young adults. Infants get NRSTS, but their tumors constitute a distinctive set of histologies. Surgery is a major therapeutic modality and radiation plays a role. RMS is treated with adjuvant chemotherapy, whereas chemotherapy is reserved for the NRSTS that are high grade or unresectable. This review discusses the etiology, biology, and treatment of pediatric soft tissue sarcomas.
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Affiliation(s)
- David M Loeb
- Oncology and Pediatrics, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Bunting-Blaustein Cancer Research Building, Baltimore, MD 21231, USA.
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