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Orlando G, Santoro F, Linari A, Tampieri C, Verdun di Cantogno L, De Meo S, Ratto N, Grignani G, Papotti M, Senetta R. SS18-SSX Antibody: A Useful Tool to Save Time and Reduce Costs in Synovial Sarcoma Diagnosis. Proposal of a Novel Diagnostic Algorithm. J Histochem Cytochem 2023; 71:377-385. [PMID: 37357741 PMCID: PMC10363909 DOI: 10.1369/00221554231184287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 06/05/2023] [Indexed: 06/27/2023] Open
Abstract
Synovial sarcoma is a rare malignant mesenchymal neoplasm mostly affecting young adults, characterized by a specific translocation which results in the fusion of the SS18 gene on chromosome 18 with one of the three highly homologous SSX genes on chromosome X. Its morphological diagnosis, especially in monophasic or poorly differentiated variants, can be challenging because histological features often overlap with other malignant mesenchymal tumors. Until recently, the differential diagnosis mostly relied on the use of cytogenetic or molecular analyses to detect the specific t(X;18)(p11;q11) translocation, thus virtually restricting its correct identification to referral centers with a high histological and molecular pathology workflow. The recently commercialized highly sensitive and fusion-specific SS18-SSX antibody has significantly improved the approach to these tumors, representing a relatively cheap and easy to access tool for synovial sarcoma diagnosis. Through a retrospective analysis of 79 synovial sarcomas and histological mimickers, this study confirms the usefulness of the SS18-SSX antibody in the diagnosis of synovial sarcoma, particularly focusing on its application in the pathological response evaluation after neoadjuvant treatment as well as its time- and cost-saving advantages. Finally, we here propose a new diagnostic algorithm to apply into the routine practice.
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Affiliation(s)
- Giulia Orlando
- Pathology Unit, Department of Oncology, Città della Salute e della Scienza Hospital, University of Turin, Turin, Italy
| | - Federica Santoro
- Pathology Unit, Department of Medical Sciences, Città della Salute e della Scienza Hospital, University of Turin, Turin, Italy
| | - Alessandra Linari
- Pathology Unit, Città della Salute e della Scienza Hospital, Turin, Italy
| | - Cristian Tampieri
- Pathology Unit, Department of Medical Sciences, Città della Salute e della Scienza Hospital, University of Turin, Turin, Italy
| | | | - Simone De Meo
- Fondazione per la ricerca sui tumori dell’apparato muscoloscheletrico e rari Onlus, Turin, Italy
| | - Nicola Ratto
- Orthopaedic Oncological Surgery, Città della Salute e della Scienza Hospital, Turin, Italy
| | - Giovanni Grignani
- Medical Oncology Unit, Città della Salute e della Scienza Hospital, Turin, Italy
| | - Mauro Papotti
- Pathology Unit, Department of Oncology, Città della Salute e della Scienza Hospital, University of Turin, Turin, Italy
| | - Rebecca Senetta
- Pathology Unit, Department of Oncology, Città della Salute e della Scienza Hospital, University of Turin, Turin, Italy
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Tahara S, Kohara M, Honma K, Morii E. Detection of synovial sarcoma with an atypical fusion transcript by using SS18-SSX and SSX antibodies. Pathol Int 2020; 70:689-691. [PMID: 32564448 DOI: 10.1111/pin.12976] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/03/2020] [Accepted: 06/05/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Shinichiro Tahara
- Department of Pathology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Masaharu Kohara
- Department of Pathology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Keiichiro Honma
- Department of Pathology, Osaka International Cancer Institute, Osaka, Japan
| | - Eiichi Morii
- Department of Pathology, Osaka University Graduate School of Medicine, Osaka, Japan
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