Treatment of angiomatoid fibrous histiocytoma after unplanned excision: a case report

In-depth proteome analysis of brain tissue from Ewsr1 knockout mouse by multiplexed isobaric tandem mass tag labeling

EWS RNA binding protein 1 (EWSR1) is a multifunctional protein whose epigenetic signatures contribute to the pathogenesis of various human diseases, such as neurodegenerative disorders, skin development, and tumorigenic processes. However, the specific cellular functions and physiological characteristics of EWSR1 remain unclear. In this study, we used quantitative mass spectrometry-based proteomics with tandem mass tag labeling to investigate the global proteome changes in brain tissue in Ewsr1 knockout and wild-type mice. From 9115 identified proteins, we selected 118 differentially expressed proteins, which is common to three quantitative data processing strategies including only protein level normalizations and spectrum-protein level normalization. Bioinformatics analysis of these common differentially expressed proteins revealed that proteins up-regulated in Ewsr1 knockout mouse are mostly related to the positive regulation of bone remodeling and inflammatory response. The down-regulated proteins were associated with the regulation of neurotransmitter levels or amino acid metabolic processes. Collectively, these findings provide insight into the physiological function and pathogenesis of EWSR1 on protein level. Better understanding of EWSR1 and its protein interactions will advance the field of clinical research into neuronal disorders. The mass spectrometry proteomics data have been deposited to the ProteomeXchange Consortium via the PRIDE partner repository with the dataset identifier PXD026994.

Angiomatoid Fibrous Histiocytoma, A Great Mimicker -A Short Series of 3 Cases with EWSR1 Fusion

Angiomatoid Fibrous histiocytoma (AFH) is a rare soft tissue neoplasm that is often misdiagnosed initially. It is commonly encountered in the superficial extremities of children and young adults. It is composed of a nodular proliferation of bland looking spindled to ovoid cells, some with variant histology and characterized by EWSR1 fusion. We, herein, present three such cases, who presented with swelling in the right leg (case 1), right forearm (case 2), and right thigh (case 3). Case 2 presented in the fourth decade with a large swelling compared to the other two cases that presented in 3rd decade with a small swelling. Histologic examination of case 2 showed extensive myxoid changes making it diagnostically challenging. All three cases showed EWSR1 fusion with a break-apart probe. Follow-up was uneventful in all three cases. AFH, although it is a benign neoplasm, is a great mimicker of various low-grade spindle cell sarcomas. Awareness of this entity with its various histomorphological variants is necessary to accurately diagnose this lesion.

Angiomatoid Fibrous Histiocytoma in an Elderly Male: An Unusual Presentation of a Rare Case

Angiomatoid fibrous histiocytoma (AFH) is a rare soft tissue neoplasm of low malignant potential often misdiagnosed clinically. It typically occurs in the superficial soft tissues of the extremities in children and young adults. It is characterized by recurrences and rarely metastases. Surgery remains the mainstay of management. Here, we present a rare case report of AFH in a 65-year-old male diagnosed using fine needle aspiration as spindle cell sarcoma. The patient underwent wide local excision. The patient is under follow-up. There is no evidence of metastases, and the patient is disease free three-years post-excision.

Angiomatoid Fibrous Histiocytoma Mimicking a Lymph Nodal Lesion: A Case Report

Angiomatoid fibrous histiocytoma is an uncommon soft tissue neoplasm with potential for recurrence and rare metastasis. The majority of cases are painless, slow growing and occur in superficial extremities of young adults. Here we report a case of Angiomatoid fibrous histiocytoma in a 28-year-old male patient presenting as a slowly growing painful mass in the groin region. This case is of particular interest due to its uncommon site of presentation and its misdiagnosis as lymph nodal lesion on radiology. Although it is a rare entity, it should be considered in differential diagnosis of soft tissue mass in a young patient.

Tocilizumab Controls Paraneoplastic Inflammatory Syndrome but Does Not Suppress Tumor Growth of Angiomatoid Fibrous Histiocytoma

Angiomatoid fibrous histiocytoma (AFH) is a rare soft tissue tumor that rarely metastasizes but lacks effective systemic therapy once it propagates. In some reports, high interleukin-6 (IL-6) production promotes tumor growth by autocrine stimulation and tocilizumab, an IL-6 receptor antagonist, can control AFH growth. Here, we present a case report on a patient with local recurrence and distant lymph node metastasis of AFH treated with tocilizumab. As a result, the inhibition of the IL-6 signaling pathway controlled paraneoplastic inflammatory syndrome (PIS); however, the local recurrent tumor progressed. This case implied that IL-6 is not necessarily the cause of tumor growth in AFH. Therefore, physicians should bear in mind that watchful observation is needed whether tocilizumab can control tumor progression despite the amelioration of PIS associated with the attenuated effect of IL-6 on AFH.