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Agrawal S, Ameline B, Folpe AL, Azzato E, Astbury C, Mentzel T, Knapp C, Rütten A, Creytens D, Sukov W, Baumhoer D, Billings SD, Fritchie KJ. ALK-rearranged, CD34-positive spindle cell neoplasms resembling dermatofibrosarcoma protuberans: a study of seven cases. Histopathology 2024. [PMID: 38867577 DOI: 10.1111/his.15239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 05/22/2024] [Accepted: 05/25/2024] [Indexed: 06/14/2024]
Abstract
AIMS The majority of dermatofibrosarcoma protuberans (DFSP) harbour PDGFB or PDGFD rearrangements. We encountered ALK expression/rearrangement in a PDGFB/D-negative CD34-positive spindle cell neoplasm with features similar to DFSP, prompting evaluation of ALK-rearrangements in DFSP and plaque-like CD34-positive dermal fibroma (P-LDF). METHODS AND RESULTS We searched the archives of academic institutions for cases previously coded as DFSP and P-LDF. NGS-naïve or PDGFB-negative DFSP were screened for ALK (clone D5F3) expression by immunohistochemistry. NGS or ALK FISH was performed on ALK-positive cases. Methylome profiling studies were performed and compared with conventional DFSP. One case of "DFSP" and two "P-LDF" with ALK expression were identified from the archives, while four cases were detected prospectively. These seven cases (6F:1M; 8 months to 76 years) arose in the dermis of the arm (two), scalp, eyelid, thigh, abdomen, and shoulder and ranged from 0.4 to 4.2 cm. Tumours were composed of spindled cells and displayed a storiform growth pattern. Cytologic atypia was absent, and mitotic figures were scarce (0-2/10 HPFs, high power fields). The lesional cells were diffusely positive for CD34 and ALK and negative for S100 protein. By NGS (n = 5), ALK fusion partners included DCTN1 (2), PLEKHH2, and CLIP2 in DFSP-like cases and FLNA in P-LDF-like lesions. ALK FISH was positive in one (of two) cases previously labelled P-LDF. Methylome profiling of two (of three) ALK-rearranged DFSP-like tumours showed clustering with conventional DFSP in the UMAP dimension reduction plot. To date, no tumour has recurred (n = 2; 26, 27 months). CONCLUSION We describe a cohort of novel ALK-rearranged tumours with morphologic features similar to DFSP.
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Affiliation(s)
- Shruti Agrawal
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Baptiste Ameline
- Bone Tumor Reference Center at the Institute for Medical Genetics and Pathology, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Andrew L Folpe
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Elizabeth Azzato
- Department of Anatomic Pathology, Cleveland Clinic, Cleveland, OH, USA
| | - Caroline Astbury
- Department of Anatomic Pathology, Cleveland Clinic, Cleveland, OH, USA
| | - Thomas Mentzel
- MVZ Dermatopathologie Friedrichshafen/Bodensee Part G, Friedrichshafen, Germany
| | - Calvin Knapp
- Department of Anatomic Pathology, Cleveland Clinic, Cleveland, OH, USA
| | - Arno Rütten
- MVZ Dermatopathologie Friedrichshafen/Bodensee Part G, Friedrichshafen, Germany
| | - David Creytens
- Department of Pathology, Ghent University and Ghent University Hospital, Ghent, Belgium
- CRIG, Cancer Research Institute Ghent, Ghent University and Ghent University Hospital, Ghent, Belgium
| | - William Sukov
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Daniel Baumhoer
- Bone Tumor Reference Center at the Institute for Medical Genetics and Pathology, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Steven D Billings
- Department of Anatomic Pathology, Cleveland Clinic, Cleveland, OH, USA
| | - Karen J Fritchie
- Department of Anatomic Pathology, Cleveland Clinic, Cleveland, OH, USA
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Zhao M, Song J, Yin X, Xu J, Teng X, Wang J. ALK-rearranged mesenchymal neoplasms: a clinicopathological and molecular study of eight additional cases of an emerging group of tyrosine kinase fusion mesenchymal tumours. J Clin Pathol 2024:jcp-2024-209521. [PMID: 38839088 DOI: 10.1136/jcp-2024-209521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Accepted: 04/22/2024] [Indexed: 06/07/2024]
Abstract
AIMS Mesenchymal neoplasms characterised by ALK fusions mainly include inflammatory myofibroblastic tumour (IMT) and epithelioid fibrous histiocytoma (EFH). Most recently, ALK-rearranged mesenchymal tumours that are not IMT or EFH have been reported. Our aim is to further characterise eight such neoplasms, with a detailed clinicopathological, immunohistochemical and molecular analysis. METHODS Clinicopathological features were assessed and partner agnostic targeted RNA-sequencing on clinically validated platforms was performed. RESULTS The patients consisted of seven males and one female with a median age of 47 years (28 -59 years). The tumours ranged in size from 2.0 to 10.0 cm (mean=3.0 cm) and involved superficial and deep soft tissue (n=6) and visceral locations (n=2). Of the seven patients with follow-up (9-130 months), two developed distant metastases and five had no disease recurrence or metastasis. The tumours demonstrated diverse architectures and variable cellularity and cellular morphologies. The main constitutive cells appeared in elongated spindled in three, primitive to ovoid in two and round to epithelioid in three cases. We expanded the histopathological spectrum to include mildly to moderately cellular spindled to stellate cells in a multinodular growth in a prominent myxoid and vascularised stroma (n=2). All tumours expressed ALK(D5F3); seven were positive for S100 protein and six were positive for CD34. By fluorescence in situ hybridisation, ALK rearrangement was identified in all eight tumours. ALK fusion partners were identified by RNA-sequencing in all cases, including previously reported: EML4 (n=3), DCTN (n=1), CLIP1 (n=1) and PLEKHH2 (n=1), and also two novel fusion partners: TKT (n=1) and MMP2 (n=1). CONCLUSIONS Our study expands the clinicopathological and molecular spectrum of ALK-rearranged mesenchymal neoplasms.
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Affiliation(s)
- Ming Zhao
- Ningbo Clinical Pathology Diagnosis Center, Ningbo, China
| | - Jing Song
- Ningbo Clinical Pathology Diagnosis Center, Ningbo, China
| | - Xiaona Yin
- Ningbo Clinical Pathology Diagnosis Center, Ningbo, China
| | - Jiayun Xu
- Ningbo Clinical Pathology Diagnosis Center, Ningbo, China
| | - Xiaodong Teng
- Department of Pathology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jian Wang
- Department of Pathology, Fudan University Shanghai Cancer Center; Department of Oncology, Shanghai Medical College, Fudan University; Institute of Pathology, Fudan University, Shanghai, China
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Wood ML, Fanburg-Smith JC, Brian JM, White JC, Powell JL, Freiberg AS. Successful Crizotinib-targeted Therapy of Pediatric Unresectable ERC1::ALK Fusion Sarcoma. J Pediatr Hematol Oncol 2024; 46:e184-e187. [PMID: 38099690 PMCID: PMC10898542 DOI: 10.1097/mph.0000000000002777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 10/01/2023] [Indexed: 02/28/2024]
Abstract
Anaplastic lymphoma kinase ( ALK )-fusion sarcomas are rare part of the emerging theoretically targetable tyrosine kinase RAS::MAPK pathway fusion myopericytic-ovoid sarcomas. We report our clinicopathologic and treatment experience with an ALK fusion sarcoma. A novel ELKS/RAB6-interacting/CAST family member 1 - unaligned ALK fusion infiltrative nonmetastatic low-grade sarcoma of the right hand of a 15-month-old male was treated with crizotinib, an ALK tyrosine kinase inhibitor as oral monotherapy, inducing complete radiographic and clinical resolution by 10 months and sustained response now over 12 months after elective discontinuation. Crizotinib can successfully be used to treat unresectable novel ALK fusion sarcomas.
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Affiliation(s)
- Megan L Wood
- Department of Obstetrics and Gynecology, Stony Brooke University, New York, NY
| | | | | | - Jason C White
- Department of Pediatric Oncology, St. Christopher's Hospital for Children, Philadelphia, PA
| | - Jonathan L Powell
- Department of Pediatric Hematology and Oncology, Nemours Children's Health, Wilmington, DE
| | - Andrew S Freiberg
- Pediatric Hematology/Oncology, Penn State College of Medicine, Hershey
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Almohsen SS, Demicco EG. Spindle Cell Tumors of the Sinonasal Tract: A Diagnostic Update with Focus on Ancillary Workup. Head Neck Pathol 2024; 18:8. [PMID: 38363429 PMCID: PMC10873262 DOI: 10.1007/s12105-023-01605-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 12/14/2023] [Indexed: 02/17/2024]
Abstract
Spindle cell neoplasms arising in the head and neck may be challenging to recognize due to their relative rarity. While underlying molecular alterations are increasingly elucidated, testing for these features may not be readily available. In most cases, combinations of key morphologic features and diagnostic immunohistochemical markers can be used to replace molecular diagnostics. Conversely, some molecular alterations and expression of their surrogate biomarkers are not specific for any one entity, and it is important to recognize these to avoid diagnostic pitfalls. In this review, we discuss both old and new spindle cell tumors of the sinonasal tract, with an emphasis on histologic features and clinically relevant immunohistochemical markers serving as surrogate markers for underlying genomic alterations.
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Affiliation(s)
- Shahd S Almohsen
- Department of Pathology and Laboratory Medicine, Mount Sinai Hospital and Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Elizabeth G Demicco
- Department of Pathology and Laboratory Medicine, Mount Sinai Hospital and Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada.
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Zhu P, Wang J. ALK-Rearranged Epithelioid and Spindle Cell Neoplasm of the Sinonasal Tract. Int J Surg Pathol 2024:10668969241226699. [PMID: 38303518 DOI: 10.1177/10668969241226699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Abstract
Anaplastic lymphoma kinase (ALK)-rearranged mesenchymal neoplasms (non-inflammatory myofibroblastic tumor and non-epithelioid fibrous histiocytoma) have been recently described which tend to occur in the superficial and deep soft tissues. Occurrence as a primary sinonasal neoplasm has not been reported thus far. Herein, we describe the first case of sinonasal ALK-rearranged mesenchymal tumor that harbored remarkable epithelioid and spindle cell morphology. The tumor affected a 40-year-old man who presented with flu-like symptoms and was thought to have influenza A. However, computed tomography demonstrated a nasal polypoid lesion causing curvature of the nasal septum. Histological examination revealed a heterogeneous tumor composed of round to epithelioid cells with foci of spindle cells. The tumor cells exhibited moderate pleomorphism and mitotic activity. By immunohistochemistry, they showed diffuse staining of CD34, S100, ALK (D5F3) and CD30. Fluorescence in situ hybridization analysis demonstrated ALK rearrangement. Subsequent next-generation sequencing (RNA-seq) identified a rare PLEKHH2exon6::ALKexon20 fusion. This study further demonstrates the importance of molecular profiling in identifying kinase fusion-positive soft tissue tumors, particularly for those that arise at unusual sites and display atypical cytomorphology.
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Affiliation(s)
- Peipei Zhu
- Department of Pathology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Jian Wang
- Department of Pathology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
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Iwakoshi A, Kikui H, Nakashima R, Goto Y, Ichikawa D, Sasaki E, Sekimizu M, Hattori H, Maeda N. CD30 expression in an emerging group of mesenchymal spindle cell neoplasms with ALK fusion detected by flow cytometry and immunohistochemistry. Genes Chromosomes Cancer 2024; 63:e23228. [PMID: 38380728 DOI: 10.1002/gcc.23228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Accepted: 01/29/2024] [Indexed: 02/22/2024] Open
Abstract
An emerging group of spindle cell neoplasms harboring fusions involving NTRK or non-NTRK kinase genes often share characteristic S100 and/or CD34 expression; however, the diagnostic utility of immunohistochemical stains is not well established in this family owing to their lack of specificity. Recently, CD30 expression in spindle cell neoplasms with kinase gene fusions, such as NTRK, BRAF, RAF1, and RET, has been increasingly identified. We herein report a 10-year-old girl with high-grade spindle cell sarcoma of the neck. Prior to histopathological evaluation, flow cytometry (FCM) analysis and touch smear cytology of the tumor tissue revealed CD34+ and dimCD30+ spindle cell populations. Histopathologically, the case was characterized by monomorphic spindle-shaped cytomorphology with CD30, S100, and CD34 positivity and harbored close similarities with spindle cell neoplasms with NTRK or non-NTRK gene fusions. Subsequently, a comprehensive next-generation sequencing sarcoma panel identified a rare PLEKHH2::ALK fusion, and a diagnosis of ALK-rearranged spindle cell neoplasm was made. The patient showed significant tumor response to single-agent treatment with alectinib, an ALK-tyrosine kinase inhibitor. This case supports that CD30 is expressed in an ALK-rearranged mesenchymal neoplasm. The benefit of the early detection of CD30 expression by FCM for a prompt diagnosis and treatment is highlighted in the context of an aggressive clinical course. This case represents a learning experience regarding the need to the check the status of CD30 expression in these tumors and suggests the potential clinical benefits of CD30-targeted therapy.
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Affiliation(s)
- Akari Iwakoshi
- Department of Pathology, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
- Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - Hajime Kikui
- Department of Pediatrics, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - Ryosuke Nakashima
- Clinical Laboratory Department, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - Yuya Goto
- Clinical Laboratory Department, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - Daisuke Ichikawa
- Department of Pediatrics, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - Eiichi Sasaki
- Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
- Department of Pathology and Molecular Diagnostics, Aichi Cancer Center Hospital, Nagoya, Japan
| | - Masahiro Sekimizu
- Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
- Department of Pediatrics, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - Hiroyoshi Hattori
- Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
- Department of Pediatrics, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - Naoko Maeda
- Department of Pediatrics, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
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Yatabe Y. Molecular pathology of non-small cell carcinoma. Histopathology 2024; 84:50-66. [PMID: 37936491 DOI: 10.1111/his.15080] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 10/06/2023] [Accepted: 10/10/2023] [Indexed: 11/09/2023]
Abstract
Currently, lung cancer is treated by the highest number of therapeutic options and the benefits are based on multiple large-scale sequencing studies, translational research and new drug development, which has promoted our understanding of the molecular pathology of lung cancer. According to the driver alterations, different characteristics have been revealed, such as differences in ethnic prevalence, median age and alteration patterns. Consequently, beyond traditional chemoradiotherapy, molecular-targeted therapy and treatment with immune check-point inhibitors (ICI) also became available major therapeutic options. Interestingly, clinical results suggest that the recently established therapies target distinct lung cancer proportions, particularly between the EGFR/ALK and PD-1/PD-L1-positive subsets, e.g. the kinase inhibitors target driver mutation-positive tumours, whereas driver mutation-negative tumours respond to ICI treatment. These therapeutic efficacy-related differences might be explained by the molecular pathogenesis of lung cancer. Addictive driver mutations promote tumour formation with powerful transformation performance, resulting in a low tumour mutation burden, reduced immune surveillance, and subsequent poor response to ICIs. In contrast, regular tobacco smoke exposure repeatedly injures the proximal airway epithelium, leading to accumulated genetic alterations. In the latter pathway, overgrowth due to alteration and immunological exclusion against neoantigens is initially balanced. However, tumours could be generated from certain clones that outcompete immunological exclusion and outgrow the others. Consequently, this cancer type responds to immune check-point treatment. These pathogenic differences are explained well by the two-compartment model, focusing upon the anatomical and functional composition of distinct cellular components between the terminal respiratory unit and the air-conducting system.
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Affiliation(s)
- Yasushi Yatabe
- Department of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan
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Linos K, Chang JC, Busam KJ. A cutaneous epithelioid vascular tumor harboring a TPM3::ALK fusion. Genes Chromosomes Cancer 2024; 63:e23207. [PMID: 37787425 PMCID: PMC10842594 DOI: 10.1002/gcc.23207] [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: 07/21/2023] [Revised: 09/13/2023] [Accepted: 09/23/2023] [Indexed: 10/04/2023] Open
Abstract
Substantial progress has been made in understanding the molecular pathways associated with vascular tumors over the last two decades. In addition to mutations and copy number aberrations, fusions have emerged as significant contributors to the pathogenesis of a notable subset of vascular tumors. In this report, we present a case of an unusual intradermal vascular tumor with epithelioid cytomorphology. Immunohistochemistry revealed diffuse positivity for CD31, ERG and Factor VIII, supporting its endothelial lineage. RNA sequencing (ArcherFusion Plex) revealed the presence of an in-frame fusion between the genes TPM3 Exon 8 and ALK Exon 20. Immunohistochemistry confirmed ALK expression by the endothelial cells. To our knowledge, this is the first documented case of a vascular tumor harboring an ALK fusion. It may fall within the spectrum of epithelioid hemangiomas; nevertheless, we cannot definitively exclude the possibility of it being a distinct and potentially unique benign entity on its own.
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Affiliation(s)
- Konstantinos Linos
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Jason C Chang
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Klaus J Busam
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA
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Gestrich CK, Davis JL, Biederman L, John I, Alaggio R, Giovannoni I, Arnold MA, Shenoy A, Tchakarov A, Al-Ibraheemi A. ALK-Rearranged Epithelioid Mesenchymal Neoplasm: Expanding the Spectrum of Tyrosine Kinase-Altered Mesenchymal Tumors. Mod Pathol 2023; 36:100334. [PMID: 37726067 DOI: 10.1016/j.modpat.2023.100334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 08/21/2023] [Accepted: 08/31/2023] [Indexed: 09/21/2023]
Abstract
The anaplastic lymphoma kinase (ALK) gene encodes a receptor tyrosine kinase, and fusions involving this gene have been reported in a variety of mesenchymal neoplasms. ALK-altered tumors with epithelioid morphology have been described in epithelioid inflammatory myofibroblastic sarcoma and epithelioid fibrous histiocytoma. Herein, we describe the clinicopathologic features of 7 ALK-rearranged mesenchymal tumors with epithelioid morphology occurring predominately in the pediatric population. Tumors occurred in 4 females and 3 males with an age ranging from 1 month to 28 years. Five tumors were superficial and solitary, while 1 presented with multiple peritoneal/omental nodules, and 1 presented as a large mediastinal mass. Morphologically, all tumors comprised epithelioid cells arranged in sheets, anastomosing cords, or small clusters embedded in a myxohyaline stroma. The cells had slightly variably sized ovoid nuclei with moderately prominent nucleoli and abundant eosinophilic cytoplasm. Four cases had sparse mitotic figures without necrosis. The remaining 3 tumors (2 deep and 1 superficial) had more than 10 mitoses per 10 high-power fields as well as foci of necrosis. ALK fusions were identified in all cases. The fusion partners included HMBOX1 (n = 1), VCL (n = 1), PRRC2B (n = 1), MYH10 (n = 1), STRN (n = 1), and EML4 (n = 2). One tumor recurred locally 2 years after initial resection; 1 patient had widely metastatic disease (mediastinal tumor). At the time of last follow-up (n = 6), 4 patients were alive without evidence of disease, 1 died due to complications of therapy (peritoneal tumor), and 1 was alive with disease. Our findings expand the spectrum of ALK-rearranged mesenchymal tumors. Our cases predominately occurred in older children and mainly exhibited epithelioid to round cell morphology, as opposed to spindle cell morphology. We also show that tumors in a deep location with higher-grade features follow a more aggressive clinical course.
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Affiliation(s)
- Catherine K Gestrich
- University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania; Boston Children's Hospital, Boston, Massachusetts
| | - Jessica L Davis
- Oregon Health & Science University, Portland, Oregon; Indiana University, Indianapolis, Indiana
| | | | - Ivy John
- University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Rita Alaggio
- Università La Sapienza/Bambino Gesu Children's Hospital, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Rome, Italy
| | - Isabella Giovannoni
- Università La Sapienza/Bambino Gesu Children's Hospital, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Rome, Italy
| | - Michael A Arnold
- University of Colorado, Anschutz Medical Campus, Aurora, Colorado; Children's Hospital Colorado, Aurora, Colorado
| | - Archana Shenoy
- Nationwide Children's Hospital, Columbus, Ohio; The Ohio State University College of Medicine, Columbus, Ohio
| | - Amanda Tchakarov
- University of Texas Health Science Center McGovern Medical School, Houston, Texas
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