The American Journal of Surgical Pathology最新文献

{"title":"Morphologic Patterns and the Correlation With MYD88 L265P, CD79B Mutations in Primary Adrenal Diffuse Large B-Cell Lymphoma","authors":"Zihang Chen, Y. Zou, Wei-ping Liu, Pujun Guan, Qing Tao, C. Xiang, Wenyan Zhang, Y. Ye, Jiaqi Yan, Sha Zhao","doi":"10.1097/PAS.0000000000001386","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001386","url":null,"abstract":"Supplemental Digital Content is available in the text. Primary adrenal diffuse large B-cell lymphoma (PA-DLBCL) is a rare subtype of extranodal DLBCL. Because of the rarity of this disease, its morphologic and genetic features are not comprehensively studied. Here, we systematically reviewed the clinicopathologic features of 42 cases of PA-DLBCL from our institution and investigated the frequency of MYD88 L265P and CD79B (exon 5) mutation in 29 eligible cases using Sanger sequencing. Clinically, PA-DLBCL was predominant in elderly male patients with advanced clinical stage and poor outcomes. Morphologically, the tumors often showed a sinusoidal and/or cohesive pattern with condensed chromatin and inconspicuous nucleolus which mimicked neuroendocrine carcinoma. Moreover, increased Reed-Sternberg–like cells were observed frequently. These confounding morphologic manifestations may lead to misdiagnosis. Genetically, PA-DLBCL harbored a high prevalence of MYD88 L265P (24%) and CD79B mutations (52%) which may be involved in lymphomagenesis. The CD79B mutation was significantly associated with a worse prognosis. A novel Histo-Molecular Classification system (4 categories) was proposed based on correlation with genetic changes. Generally, the neuroendocrine carcinoma–like type was associated with CD79B mutation, whereas the RS-like cell type indicated MYD88 L265P. The biphasic type was correlated with coexisting mutations of MYD88 and CD79B, whereas the common type implied no mutation. Furthermore, the common type showed significantly better survival. In conclusion, the proposed new category system could indicate the genetic changes as well as facilitate risk stratification to guide treatment and predict prognosis. Although this study augmented our understanding of PA-DLBCL, further analysis is required to validate our results and extend them to extranodal DLBCL at other sites.","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122510083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prostate Carcinoma Grade and Length But Not Cribriform Architecture at Positive Surgical Margins Are Predictive for Biochemical Recurrence After Radical Prostatectomy","authors":"E. Hollemans, Esther I. Verhoef, C. Bangma, J. Rietbergen, J. Helleman, M. Roobol, G. V. van Leenders","doi":"10.1097/PAS.0000000000001384","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001384","url":null,"abstract":"Postoperative biochemical recurrence occurs in up to 40% of prostate carcinoma patients treated with radical prostatectomy. Primary tumor grade and cribriform architecture are important parameters for clinical outcome; however, their relevance at positive surgical margins has not been completely elucidated yet. We reviewed 835 radical prostatectomy specimens and recorded pT-stage, surgical margin status, Grade Group, and cribriform architecture of the primary tumor and at positive surgical margins. Clinicopathologic parameters and biochemical recurrence-free survival (BCRFS) were used as endpoints. Positive surgical margins were present in 284 (34%) patients, with a median cumulative length of 5.0 mm. In 46%, the Grade Group at the margin was equal to the primary tumor grade, while being lower in 42% and higher in 12%. In multivariable analysis, Grade Group at the margin outperformed the Grade Group of the primary tumor in predicting BCRFS. Among primary Grade Group 2 patients, 56% had Grade Group 1 disease at the margin. Multivariable analysis identified cumulative length, Grade Group at the margin, and lymph node metastasis as independent predictors for BCRFS, while percentage Gleason pattern 4, tertiary Gleason pattern 5 of the primary tumor, and cribriform architecture at the margin were not. In conclusion, the Grade Group at the positive surgical margin was dissimilar to the primary tumor grade in 54% and better predicted BCRFS than the primary tumor grade. Cumulative length and tumor grade at the margin were independent predictors for BCRFS, whereas cribriform architecture at the margin was not.","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128807230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recurrent YAP1 and KMT2A Gene Rearrangements in a Subset of MUC4-negative Sclerosing Epithelioid Fibrosarcoma","authors":"Yu-Chien Kao, Jen-Chieh Lee, Lei Zhang, Yun‐Shao Sung, D. Swanson, Tsung-Han Hsieh, Yun-Ru Liu, Narasimhan P. Agaram, Hsuan-Ying Huang, B. Dickson, C. Antonescu","doi":"10.1097/PAS.0000000000001382","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001382","url":null,"abstract":"Supplemental Digital Content is available in the text. Sclerosing epithelioid fibrosarcoma (SEF) is an aggressive soft tissue sarcoma, characterized by a distinctive epithelioid phenotype in a densely sclerotic collagenous stroma, that shows frequent MUC4 immunoreactivity and recurrent gene fusions, often involving EWSR1 gene. A pathogenetic link with low-grade fibromyxoid sarcoma (LGFMS) has been suggested, due to cases with hybrid morphology as well as overlapping genetic signature. However, a small subset of SEF is negative for MUC4 and lacks the canonical EWSR1/FUS gene rearrangements. Triggered by the identification of recurrent YAP1-KMT2A gene fusions by RNA sequencing in 3 index cases of MUC4-negative, EWSR1/FUS fusion-negative SEF, we further investigated a cohort of 14 similar SEF cases (MUC4-negative, EWSR1/FUS fusion-negative) by fluorescence in situ hybridization (FISH), reverse transcription-polymerase chain reaction, and/or DNA-based massively parallel sequencing (MSK-IMPACT) for abnormalities in these genes. Three additional SEFs with KMT2A gene rearrangements and one additional case with YAP1 gene rearrangements were identified by FISH. In addition, one case with YAP1-KMT2A and one with KMT2A-YAP1 fusion were detected by reverse transcription-polymerase chain reaction and MSK-IMPACT, respectively. As a control group, 24 fibromyxoid spindle cell tumors, diagnosed or suspected as fusion-negative LGFMS, were also tested for YAP1 and KMT2A abnormalities by FISH, but none were positive. The YAP1/KMT2A-rearranged SEF group affected patients ranging from 10 to 86 years old (average and median: 45) of both sexes (4 females, 5 males). The tumors involved somatic soft tissues with a wide distribution, including extremities, trunk, neck, and dura. Histologically, the tumors showed variable cellularity, with monotonous ovoid to epithelioid tumor cells and hyalinized collagenous background typical of SEF. More than half of the cases showed infiltrative borders, within fat or skeletal muscle. No LGFMS component was identified. All tumors were negative for MUC4 and had an otherwise nonspecific immunophenotype. Of the 6 cases with available follow-up information, 2 had local recurrences, and 2 developed soft tissue and/or bone metastases, including 1 of them died of the disease.","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114142056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adverse Histopathologic Characteristics in Small Clear Cell Renal Cell Carcinomas Have Negative Impact on Prognosis","authors":"Chen Yang, B. Shuch, M. Serrano, A. Kibel, Cayce B. Nawaf, R. Vollmer, P. Humphrey, Adebowale J. Adeniran","doi":"10.1097/PAS.0000000000001333","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001333","url":null,"abstract":"Tumor size has been used for decision making in the management of patients with renal masses. Active surveillance in selected patients is now increasingly common in tumors ≤4 cm in size. Clear cell renal cell carcinoma (CCRCC) is the most common type of renal malignancy. Adverse histopathologic characteristics that correlate with worse prognosis have been described in CCRCCs. The aim of our study was to determine the frequency and extent of adverse histopathologic characteristics in CCRCCs ≤4 cm and their association with patient outcome. A search of a single institution for nephrectomies performed for CCRCC identified 631 consecutive cases. Cases were reviewed for the following morphologic features: high nuclear grade, necrosis, lymphovascular invasion, and rhabdoid or sarcomatoid histology. Relationships between the variables were examined by Kruskal-Wallis test, Wilcoxon test, χ2 test, and logistic regression. We found adverse tumor histopathologic characteristics were significantly related to size: In CCRCCs >4 versus ≤4 cm, there were more high nuclear grade (45% vs. 15%, P<0.01), necrosis (46% vs. 21%, P<0.01), and lymphovascular invasion (17% vs. 3%, P<0.01). Although adverse histologic features are less commonly seen in CCRCCs ≤4 cm, their presence was associated with lower disease-free survival (P<0.01). Adverse histopathologic characteristics in CCRCCs ≤4 cm correlated with worse prognosis and identification of these features through needle core biopsy examination may guide clinical management, especially in patients for whom active surveillance is considered.","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129231877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Class-switched Primary Cutaneous Marginal Zone Lymphomas Are Frequently IgG4-positive and Have Features Distinct From IgM-positive Cases","authors":"E. Carlsen, S. Swerdlow, J. Cook, Sarah E. Gibson","doi":"10.1097/PAS.0000000000001363","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001363","url":null,"abstract":"Primary cutaneous marginal zone lymphoma (PCMZL) can be subdivided into 2 groups based on immunoglobulin (Ig) heavy chain usage: IgM-positive cases that constitute a less common and more T-helper type 1–driven process, and more common heavy chain class-switched cases that are predominantly T-helper type 2–driven. Although some report a significant IgG4-positive subset, others have found a much smaller proportion. To further evaluate the proportion of IgG4-positive PCMZL, to address whether IgG4-positive cases have any distinctive characteristics, and to assess whether additional features separating IgM-positive and class-switched cases could be identified, the clinicopathologic features of 26 PCMZL obtained from 19 patients were investigated. Twenty of 26 (77%) PCMZL were heavy chain class-switched (19 IgG-positive, 1 IgA-positive), including 9 that were IgG4-positive (35%). IgG4-positive and other class-switched PCMZL were morphologically similar. IgM-positive cases occurred in older individuals (median: 69 vs. 46.5 y; P=0.0001), more often involved the subcutis (P=0.002), demonstrated plasma cells diffusely scattered versus at the periphery of the lymphoid infiltrate (P=0.005), uniformly showed follicular colonization (P=0.0001), contained more numerous B cells (P=0.0004), and were more likely to have a T-cell CD4:CD8 ratio of <3:1 (P=0.03). None of the IgM-positive PCMZL harbored a MYD88 L265P mutation. No significant differences in clinical outcome were documented. These results highlight the high frequency of IgG4-positive PCMZL, which are otherwise similar to other class-switched cases, provide additional evidence supporting the distinction between class-switched and IgM-positive cases, and emphasize the indolent nature of at least the class-switched PCMZL, which may warrant their categorization as a clonal chronic lymphoproliferative disorder.","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"44 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123372460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prognostic Value of Poorly Differentiated Clusters in Liver Metastatic Lesions of Colorectal Carcinoma","authors":"Keisuke Yonemura, Y. Kajiwara, Tadakazu Ao, S. Mochizuki, E. Shinto, Koichi Okamoto, K. Hase, H. Ueno","doi":"10.1097/PAS.0000000000001329","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001329","url":null,"abstract":"Colorectal liver metastasis (CRLM) is the most common pattern of metastases or recurrence in colorectal carcinoma; however, no robust pathologic prognostic factors have been identified. This study aimed to verify the prognostic value of poorly differentiated clusters (PDC) in liver metastatic lesions and to clarify the correlation between PDC in liver metastatic lesions (PDCliver) and the primary tumor histology. Consecutive patients who underwent resection for CRLM were pathologically reviewed. PDC was defined as cancer clusters comprising ≥5 cancer cells and lacking glandular formation and was quantifiably graded as G1 (<5 clusters), G2 (5 to 9 clusters), and G3 (≥10 clusters) based on the highest number of clusters observed under ×20 magnification. The cohort comprised 204 patients. PDCliver was classified as G1, G2, and G3 for 68, 69, and 67 patients, respectively, and it was significantly associated with PDC grade in the primary tumor (P<0.001). Among the potential prognostic factors, tumor budding in the primary tumor, PDC in the primary tumor, the number of liver metastases, extrahepatic metastasis, and PDCliver significantly influenced overall survival (OS) after CRLM resection. According to the PDCliver grade, the 5-year OS rates were 68.9%, 48.3%, and 39.5% for G1, G2, and G3 (P<0.001), respectively. Multivariate analysis for OS showed that PDCliver grade, tumor budding in the primary tumor, the number of liver metastasis and extrahepatic metastasis were independent prognostic factors. In conclusion, there is a correlation in the PDC grade between the primary tumor and liver metastatic lesion, and PDCliver grade could be a promising new prognostic factor after CRLM resection.","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133881902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Histopathologic Changes Induced by Polyethylene Glycol Hydrogel Pleural Sealants Used During Transthoracic Biopsy on Lung Cancer Resection Specimen Staging","authors":"K. Butnor, Adina A Bodolan, Britni R E Bryant, A. Schned","doi":"10.1097/PAS.0000000000001383","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001383","url":null,"abstract":"Patients undergoing transthoracic needle core lung biopsy (TTNB) are at risk for biopsy-related pneumothorax. Instilling pleural sealant at the pleural puncture site reduces this risk. The impact of histologic changes associated with pleural sealant on assessing the histologic type and pathologic stage in lung cancer resection specimens has not been previously evaluated. All lung cancer resection specimens from 2015 to 2018 in which polyethylene glycol hydrogel pleural sealant was instilled during TTNB were reviewed. Thirty-three cases were identified. TTNB preceded lobectomy by an average of 35 days. Amphophilic, weakly polarizable, crinkled pleural sealant material was associated with tumor in 11 cases (33%), including 8 adenocarcinomas, 2 squamous cell carcinomas, and 1 pleomorphic carcinoma that averaged 1.7 cm in greatest dimension. Surrounding the sealant material was a 0.25 to 1.0 cm in greatest dimension pseudocystic space with a thin granulomatous rim of macrophages and multinucleated giant cells that occupied on average 17% of the tumoral area. Pleural sealant could have impaired assessment of pathologic stage in 1 case by obscuring the visceral pleural elastic layer, but definitive visceral pleural invasion was present nearby. Although hydrogel pleural sealant instilled during TTNB has the potential to obscure important histologic features, in practice, it appears to have little or no adverse impact on the assessment of histologic type and pathologic stage in subsequent lung cancer resection specimens. Recognition of the histologic appearance of hydrogel pleural sealant and its associated tissue response is important for avoiding diagnostic misinterpretation.","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114648028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Practical Approaches on CD30 Detection and Reporting in Lymphoma Diagnosis","authors":"Mina L. Xu, Ali M. Gabali, E. Hsi, Y. Fedoriw, Kiran R. Vij, M. Salama, R. Ramchandren, D. O’Malley, M. Wick, M. Battistella, A. Gru","doi":"10.1097/PAS.0000000000001368","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001368","url":null,"abstract":"While our understanding of the biology of CD30 in lymphoma continues to evolve, our need to detect and measure its expression at the protein level remains critically important for diagnosis and patient care. In addition to its diagnostic and prognostic utility, CD30 has emerged as a vehicle for drug targeting through the antibody-drug conjugate brentuximab-vedotin (BV). Given the numerous ways that CD30 is utilized and its emergence as a predictive/prognostic biomarker, pathologists must come to a general consensus on the best reporting structure and methodology to ensure appropriate patient care. In this manuscript, we review the indications for testing, various modalities for testing, technical challenges, pitfalls, and potential standards of reporting. The following questions will try to be addressed in the current review article: What defines a “POSITIVE” level of CD30 expression?; How do we evaluate and report CD30 expression?; What are the caveats in the evaluation of CD30 expression?","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124410270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Endometrial Gastric (Gastrointestinal)-type Mucinous Lesions","authors":"R. Wong, A. Ralte, K. Grondin, K. Talia, W. McCluggage","doi":"10.1097/PAS.0000000000001381","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001381","url":null,"abstract":"Supplemental Digital Content is available in the text. With the recent elucidation of gastric-type lesions in the female genital tract (especially in the cervix), occasional cases of endometrial adenocarcinoma displaying gastric (gastrointestinal) differentiation have been reported, but they are currently not recognized as a distinct pathologic entity. We report 9 cases of endometrial mucinous lesions which exhibit gastric (gastrointestinal)-type features by morphology and immunohistochemistry, including 4 adenocarcinomas and 5 benign mucinous lesions, in patients aged 32 to 85. The adenocarcinomas showed gastric-type morphology in all 4 cases and goblet cells in 1, with a component of benign gastric-type mucinous glands in 1 case. Immunohistochemically, the adenocarcinomas were positive for CK7 (4/4), CEA (4/4), MUC6 (3/3), PAX8 (3/4), CK20 (2/4), CDX2 (2/4), and estrogen receptor (1/4). They were negative for Napsin A (0/3), with mutation-type p53 staining in 2/4 cases, block-type p16 positivity in 1/4, and scattered chromogranin-positive cells in 1/2. Targeted next-generation sequencing revealed nonsense mutation in RB1 gene for the case with block-positive p16. Follow-up was available in all adenocarcinoma cases and indicated aggressive behavior; 2 patients were dead of disease at follow-up of 7 months to 3 years, 1 was alive with progression at 9 months, and 1 was alive without disease at 7 months. The benign mucinous lesions (including the benign component in 1 adenocarcinoma) exhibited gastric-type morphologic features in 5/6 cases, goblet cells in 5/6, and Paneth-like neuroendocrine cells in 1/6. These benign mucinous lesions were associated with an endometrial polyp in 5/6 cases. Cytologic atypia was present in 2/6 cases and a lobular architecture resembling cervical lobular endocervical glandular hyperplasia in 4/6. Immunohistochemically, the benign mucinous lesions were positive for CK7 (5/5), CDX2 (5/6), estrogen receptor (4/5), MUC6 (4/5), CK20 (3/5), PAX8 (3/5), and CEA (2/4), with scattered chromogranin-positive cells in 4/4 cases; in all cases tested Napsin A was negative, p53 was wild-type and p16 was negative. We propose the term “endometrial gastric (gastrointestinal)-type adenocarcinoma” for this distinctive group of rare aggressive endometrial carcinomas. We believe that benign or atypical gastric (gastrointestinal)-type mucinous lesions are putative precursors for these adenocarcinomas, comparable to recognized premalignant gastric-type lesions in the cervix and the vagina. Future recognition and reporting of these gastric-type endometrial mucinous lesions will help delineate their pathogenesis and clinical significance.","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117269939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Myoepithelioma-like Hyalinizing Epithelioid Tumors of the Hand With Novel OGT-FOXO3 Fusions","authors":"Jen-Chieh Lee, H. Chou, Chung-Hsi Wang, Ping-Yuan Chu, Tsung-Han Hsieh, Mei-Ling Liu, S. Hsieh, Yun-Ru Liu, Yu-Chien Kao","doi":"10.1097/PAS.0000000000001380","DOIUrl":"https://doi.org/10.1097/PAS.0000000000001380","url":null,"abstract":"Myoepithelial tumors of soft tissue are uncommon neoplasms characterized histologically by spindle to epithelioid cells arranged in cords, nests, and/or reticular pattern with chondromyxoid to hyaline stroma, and genetically by rearrangement involving EWSR1 (among other less common genes) in about half of the cases. The diagnosis often requires immunostaining to confirm myoepithelial differentiation, most importantly the expression of epithelial markers and S100 protein and/or GFAP. However, there are cases wherein the morphology is reminiscent of myoepithelial tumors, while the immunophenotype falls short. Here, we report 2 highly similar myoepithelioma-like tumors arising in the hands of young adults. Both tumors were well-demarcated and composed of alternating cellular areas with palely eosinophilic hyaline stroma and scattered acellular zones of densely eosinophilic collagen deposition. The tumor cells were mainly epithelioid cells and arranged in cords or small nests. Vacuolated cells encircling hyaline matrix globules were focally prominent. A minor component of nonhyaline fibrous nodular areas composed of bland spindle cells and rich vasculature was also observed. Perivascular concentric spindle cell proliferation and perivascular hyalinization were present in some areas. The tumor cells were positive for CD34 and epithelial membrane antigen (focal) by immunostaining, while largely negative for cytokeratin, S100, GFAP, p63, GLUT1, and claudin-1. By RNA sequencing, a novel OGT-FOXO3 fusion gene was identified in case 1 and confirmed by reverse transcription polymerase chain reaction and fluorescence in situ hybridization in both cases. Sharing the unusual clinicopathologic features and the novel fusion, these 2 cases probably represent a distinct tumor entity, whose relationship with myoepithelial tumors and tumorigenic mechanisms exerted by the OGT-FOXO3 fusion remain to be studied.","PeriodicalId":275221,"journal":{"name":"The American Journal of Surgical Pathology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124181442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}