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Intrathoracic synovial sarcoma with BRAF V600E mutation
Ida Russo1, Sabina Barresi2, Pier Luigi Di Paolo3
1Department of Pediatric Hematology and Oncology, Gene and Cellular Therapy, Bambino Gesù Children's Hospital IRCCS, Rome, Italy.
Abstract:
We report a case of 15-year-old boy with intrathoracic synovial sarcoma who relapsed after standard chemotherapy, surgery and radiotherapy. The molecular analysis of the tumour identified a BRAF V600E mutation at time of progression of relapsed disease under third line systemic treatment. This mutation is commonly seen in melanomas and papillary thyroid cancers, but less prevalent (typically <5%) across a variety of other cancer types. The patient underwent selective BRAF inhibitor Vemurafenib treatment achieving partial response (PR) with a progression free survival (PFS) ratio of 1.6 months and an overall survival of 19 months, alive in continuous PR. This case highlights the role of routinely next generation sequencing (NGS) used to drive treatment choice and to investigate extensively synovial sarcoma tumour for BRAF mutation.
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