PMID- 38279510 OWN - NLM STAT- MEDLINE DCOM- 20240214 LR - 20240314 IS - 2573-8348 (Electronic) IS - 2573-8348 (Linking) VI - 7 IP - 2 DP - 2024 Feb TI - COL1A1::PDGFB fusion-associated uterine fibrosarcoma: A case report and review of the literature. PG - e1969 LID - 10.1002/cnr2.1969 [doi] LID - e1969 AB - BACKGROUND: Mesenchymal neoplasms of the uterus encompass a diverse group of tumors, with varying characteristics and origins, collectively accounting for 8% of uterine malignancies. The most common variants include uterine leiomyosarcoma, low-grade and high-grade endometrial stromal sarcoma, adenosarcoma, and undifferentiated sarcoma. Clinical presentation is often nonspecific and can lead to delayed diagnosis. Uterine sarcomas are generally aggressive, resulting in poorer prognosis compared to carcinomas. Recent advances in molecular techniques, such as next-generation sequencing (NGS), have led to the identification of new subtypes of uterine sarcomas, including COL1A1::PDGFB fusion-associated fibrosarcoma, which has a specific chromosomal translocation t(17;22)(q22;q13). Imatinib, a tyrosine kinase inhibitor (TKI), is an effective treatment for dermatofibrosarcoma protuberans (DFSP), marked by this translocation. CASE: We present the case of a 42-year-old woman diagnosed with COL1A1::PDGFB fusion-associated uterine fibrosarcoma. The patient underwent total hysterectomy and excision of the tumor, initially misdiagnosed as a low-grade leiomyosarcoma. Subsequent histological examination, immunohistochemistry, and fluorescence in situ hybridization (FISH) confirmed the diagnosis. After 10 months, disease recurrence was detected, and Imatinib therapy was initiated at a dose of 400 mg daily. An allergic reaction led to a temporary discontinuation, but upon resumption with appropriate medication, a positive radiological response was observed. The patient achieved a complete remission after 2 years and is still on Imatinib treatment. CONCLUSIONS: COL1A1::PDGFB fusion-associated uterine fibrosarcoma is an extremely rare mesenchymal neoplasm. In a case we present herein, we treated a patient with imatinib as first-line medical therapy. The patient is currently in complete remission after 37 months from treatment start. To the best of our knowledge, this represents a unique observation. We also provide a detailed literature review of the published cases so far. Prospective case series are needed to further understand the natural history of these tumors and optimize treatment strategies. CI - (c) 2024 The Authors. Cancer Reports published by Wiley Periodicals LLC. FAU - Rota, Simone AU - Rota S AUID- ORCID: 0009-0006-9172-7003 AD - Department of Medical Oncology, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milan, Italy. FAU - Franza, Andrea AU - Franza A AD - Department of Medical Oncology, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milan, Italy. FAU - Fabbroni, Chiara AU - Fabbroni C AD - Department of Medical Oncology, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milan, Italy. FAU - Paolini, Biagio AU - Paolini B AD - Department of Medical Oncology, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milan, Italy. FAU - Greco, Francesca Gabriella AU - Greco FG AD - Department of Interventional Radiology, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Nazionale Dei Tumori, Milan, Italy. FAU - Alessi, Alessandra AU - Alessi A AD - Department of Nuclear Medicine, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy. FAU - Padovano, Barbara AU - Padovano B AD - Department of Nuclear Medicine, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy. FAU - Casali, Paolo AU - Casali P AD - Department of Medical Oncology, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milan, Italy. AD - Medical Oncology, Universita degli Studi, Milan, Italy. FAU - Sanfilippo, Roberta AU - Sanfilippo R AD - Department of Medical Oncology, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milan, Italy. LA - eng PT - Case Reports PT - Review DEP - 20240126 PL - United States TA - Cancer Rep (Hoboken) JT - Cancer reports (Hoboken, N.J.) JID - 101747728 RN - 0 (Proto-Oncogene Proteins c-sis) RN - 8A1O1M485B (Imatinib Mesylate) SB - IM MH - Female MH - Humans MH - Adult MH - Proto-Oncogene Proteins c-sis/genetics/therapeutic use MH - Imatinib Mesylate/therapeutic use MH - *Dermatofibrosarcoma/diagnosis/genetics/pathology MH - In Situ Hybridization, Fluorescence MH - *Leiomyosarcoma MH - *Skin Neoplasms/pathology MH - Neoplasm Recurrence, Local MH - *Fibrosarcoma/diagnosis/drug therapy/genetics MH - *Soft Tissue Neoplasms MH - Translocation, Genetic MH - Uterus/pathology PMC - PMC10849982 OTO - NOTNLM OT - COL1A1::PDGFB OT - Imatinib OT - fibrosarcoma OT - soft tissue sarcomas OT - translocation t(17;22)(q22;q13) OT - uterus COIS- Dr Sanfilippo reported receiving personal fees from PharmaMar, Rain Oncology, and Boehringer Ingelheim and fees to her institution from Advenchen Laboratories, Amgen, Bayer, Epizyme, Eli Lilly, Daiichi, GlaxoSmithKline (GSK), Karyopharm, Novartis, Rain Therapeutics, Pfizer, SpringWorks Therapeutics, and PharmaMar outside the submitted work. Dr Fabbroni reported fees to her institution from Advenchen Laboratories, Amgen Dompe, AROG Pharmaceuticals, Bayer, Blueprint Medicines, Deciphera, Epizyme, Eli Lilly, Daiichi Sankyo, GSK, Karyopharm, Novartis, Pfizer, PharmaMar, SpringWorks Therapeutics, and Rain Therapeutics outside the submitted work. Dr Casali reported receiving grants from PharmaMar, Advenchen Laboratories, Amgen Dompe, AROG Pharmaceuticals, Bayer, Blueprint Medicines, Daiichi Sankyo, Eisai, Eli Lilly, Epizyme Inc, GSK, Deciphera, Karyopharm Pharmaceuticals, Novartis, and Pfizer outside the submitted work. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. EDAT- 2024/01/27 12:44 MHDA- 2024/02/10 22:54 PMCR- 2024/01/26 CRDT- 2024/01/27 01:03 PHST- 2023/11/28 00:00 [revised] PHST- 2023/09/18 00:00 [received] PHST- 2023/12/28 00:00 [accepted] PHST- 2024/02/10 22:54 [medline] PHST- 2024/01/27 12:44 [pubmed] PHST- 2024/01/27 01:03 [entrez] PHST- 2024/01/26 00:00 [pmc-release] AID - CNR21969 [pii] AID - 10.1002/cnr2.1969 [doi] PST - ppublish SO - Cancer Rep (Hoboken). 2024 Feb;7(2):e1969. doi: 10.1002/cnr2.1969. Epub 2024 Jan 26.