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1.
Semin Diagn Pathol ; 41(2): 108-115, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38228439

RESUMEN

IgG4-related lymphadenopathy is a nodal manifestation of IgG4-related disease (IgG4RD) which is characterized by increased polytypic IgG4+ plasma cells and IgG4+/IgG+ plasma cell ratio in lymph nodes and morphologically manifested as various patterns of reactive lymphadenopathy: Castleman disease-like, follicular hyperplasia, interfollicular expansion, progressive transformation of germinal centers and inflammatory pseudotumor-like. It typically presents with solitary or multiple, mild to moderate lymph node enlargement in otherwise asymptomatic patients. The serum IgG4 level is frequently elevated but C-reactive protein often remains normal. In patients not having a history of IgG4RD or manifestation of extranodal IgG4RD, a diagnosis of IgG4-lymphadenopathy should only be made with great caution given the non-specific morphologic features that can overlap with ANCA-associated vasculitis, interleukin-6 syndromes, Rosai-Dorfman disease, inflammatory myofibroblastic tumor, syphilis, lymphoma, and plasma cell neoplasia. Elevated IgG4 parameters, appropriate morphologies, and clinical correlation are essential to make the diagnosis of IgG4-lymphadenopathy more specific and clinically meaningful.


Asunto(s)
Enfermedad de Castleman , Enfermedad Relacionada con Inmunoglobulina G4 , Linfadenopatía , Linfoma , Humanos , Inmunoglobulina G , Linfadenopatía/patología , Ganglios Linfáticos/patología , Enfermedad de Castleman/diagnóstico , Enfermedad de Castleman/patología , Linfoma/patología , Enfermedad Relacionada con Inmunoglobulina G4/patología
2.
Br J Cancer ; 126(1): 57-71, 2022 01.
Artículo en Inglés | MEDLINE | ID: mdl-34718356

RESUMEN

BACKGROUND: Triple-negative breast cancer (TNBC) is an aggressive subtype of breast cancer with poor prognosis. By performing multiomic profiling, we recently uncovered super-enhancer heterogeneity between breast cancer subtypes. Our data also revealed TCOF1 as a putative TNBC-specific super-enhancer-regulated gene. TCOF1 plays a critical role in craniofacial development but its function in cancer remains unclear. METHODS: Overall survival and multivariant Cox regression analyses were conducted using the METABRIC data set. The effect of TCOF1 knockout on TNBC growth and stemness was evaluated by in vitro and in vivo assays. RNA-seq and rescue experiments were performed to explore the underlying mechanisms. RESULTS: TCOF1 is frequently upregulated in TNBC and its elevated expression correlates with shorter overall survival. TCOF1 depletion significantly inhibits the growth and stemness of basal-like TNBC, but not of mesenchymal-like cells, highlighting the distinct molecular dependency in different TNBC subgroups. RNA-seq uncovers several stem cell molecules regulated by TCOF1. We further demonstrate that KIT is a downstream effector of TCOF1 in mediating TNBC stemness. TCOF1 expression in TNBC is regulated by the predicted super-enhancer. CONCLUSIONS: TCOF1 depletion potently attenuates the growth and stemness of basal-like TNBC. Expression of TCOF1 may serve as a TNBC prognostic marker and a therapeutic target.


Asunto(s)
Regulación Neoplásica de la Expresión Génica , Células Madre Neoplásicas/patología , Proteínas Nucleares/metabolismo , Fosfoproteínas/metabolismo , Neoplasias de la Mama Triple Negativas/patología , Animales , Línea Celular Tumoral , Proliferación Celular , Biología Computacional/métodos , Bases de Datos Genéticas , Humanos , Ratones , Ratones Desnudos , Células Madre Neoplásicas/metabolismo , Proteínas Nucleares/genética , Fosfoproteínas/genética , Pronóstico , Tasa de Supervivencia , Neoplasias de la Mama Triple Negativas/genética , Neoplasias de la Mama Triple Negativas/metabolismo , Regulación hacia Arriba , Ensayos Antitumor por Modelo de Xenoinjerto
3.
Br J Neurosurg ; 35(1): 116-118, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-29433331

RESUMEN

We report a rare delayed complication of de novo pseudoaneurysm formation and rupture after stereotactic radiotherapy for cerebral arteriovenous malformation. The patient presented with intracerebral haemorrhage due to rupture of a pseudoaneurysm in the previously irradiated field, which was excised for histological examination. The literature was reviewed for similar cases.


Asunto(s)
Aneurisma Falso , Malformaciones Arteriovenosas Intracraneales , Radiocirugia , Aneurisma Falso/diagnóstico por imagen , Aneurisma Falso/etiología , Aneurisma Falso/cirugía , Hemorragia Cerebral/diagnóstico por imagen , Hemorragia Cerebral/etiología , Humanos , Malformaciones Arteriovenosas Intracraneales/diagnóstico por imagen , Malformaciones Arteriovenosas Intracraneales/cirugía , Radiocirugia/efectos adversos
4.
Clin Infect Dis ; 71(11): 2939-2946, 2020 12 31.
Artículo en Inglés | MEDLINE | ID: mdl-32562544

RESUMEN

BACKGROUND: The coronavirus disease 2019 (COVID-19) pandemic has put tremendous pressure on the healthcare system worldwide. Diagnostic testing remained one of the limiting factors for early identification and isolation of infected patients. This study aimed to evaluate posterior oropharyngeal saliva (POPS) for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) detection among patients with confirmed or suspected COVID-19. METHODS: The laboratory information system was searched retrospectively for all respiratory specimens and POPS requested for SARS-CoV-2 RNA detection between 1 February 2020 and 15 April 2020. The agreement and diagnostic performance of POPS against NPsp were evaluated. RESULTS: A total of 13772 specimens were identified during the study period, including 2130 POPS and 8438 nasopharyngeal specimens (NPsp). Two hundred and twenty-nine same-day POPS-NPsp paired were identified with POPS and NPsp positivity of 61.5% (95% confidence interval [CI] 55.1-67.6%) and 53.3% (95% CI 46.8-59.6%). The overall, negative and positive percent agreement were 76.0% (95% CI 70.2-80.9%), 65.4% (95% CI 55.5-74.2%), 85.2% (95% CI 77.4-90.8%). Better positive percent agreement was observed in POPS-NPsp obtained within 7 days (96.6%, 95% CI 87.3-99.4%) compared with after 7 days of symptom onset (75.0%, 95% CI 61.4-85.2%). Among the 104 positive pairs, the mean difference in Cp value was 0.26 (range: 12.63 to -14.74), with an overall higher Cp value in NPsp (Pearson coefficient 0.579). No significant temporal variation was noted between the 2 specimen types. CONCLUSIONS: POPS is an acceptable alternative specimen to nasopharyngeal specimen for the detection of SARS-CoV-2.


Asunto(s)
COVID-19 , SARS-CoV-2 , Técnicas de Laboratorio Clínico , Humanos , Pandemias , Estudios Retrospectivos , Saliva
5.
Mod Pathol ; 33(1): 138-152, 2020 01.
Artículo en Inglés | MEDLINE | ID: mdl-31383965

RESUMEN

Female genital melanomas are rare. At diagnosis, most affected patients have advanced disease. Surgery remains the primary treatment, and adjuvant therapy is largely ineffective. Recently, immune checkpoints and the mitogen-activated protein kinase pathway have been explored as treatment targets. However, evaluation of these biomarkers in genital melanomas is limited. We evaluated the clinicopathological features of 20 vulvar, 32 vaginal, and three cervical melanomas and assessed programmed cell death ligand 1 (PD-L1) expression, CD8 tumor-infiltrating lymphocyte density, mismatch repair proteins, VE1 immunohistochemistry, and KIT and BRAF mutations. The median age of the patients was 66 years, and median tumor sizes were 25, 30, and 20 mm for vulvar, vaginal, and cervical tumors, respectively. Mean mitotic figures were 18, 19, and 30 per mm2. Thirty-seven patients (67%) had operable tumors. After a median follow-up of 15 months, only nine patients (16%) were alive. Eight of the nine survivors did not have lymph node metastasis. Using 5% as the threshold, PD-L1 expression was observed in 55%, 50%, and 33% of vulvar, vaginal, and cervical tumors, respectively, when the Roche SP263 antibody was used and 20%, 53%, and 0%, respectively, when the Dako 28-8 antibody was used. The median CD8 tumor-infiltrating lymphocyte density was significantly higher in vulvar/vaginal than cervical melanomas and correlated with PD-L1 expression. No cases exhibited loss of mismatch repair proteins. Five cases harbored KIT mutations, three of which were hotspots. BRAF V600E mutation was not detected. Univariable analysis showed that tumor size greater than or equal to 33 mm, mitotic figures of greater than or equal to 10 per mm2, lymph node metastasis, and low CD8+ tumor-infiltrating lymphocyte density were adverse prognostic factors. Thus, patients with genital melanomas have a poor prognosis, and evaluation of multiple biomarkers is necessary to identify patients who may benefit from immunotherapy or targeted therapy.


Asunto(s)
Biomarcadores de Tumor/análisis , Neoplasias de los Genitales Femeninos/patología , Melanoma/patología , Microambiente Tumoral/inmunología , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Neoplasias de los Genitales Femeninos/genética , Neoplasias de los Genitales Femeninos/inmunología , Humanos , Linfocitos Infiltrantes de Tumor/inmunología , Melanoma/genética , Melanoma/inmunología , Persona de Mediana Edad
6.
Int J Surg Pathol ; 31(7): 1420-1425, 2023 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-36843554

RESUMEN

Fibrin-associated large B-cell lymphoma is a rare microscopic-sized tumor, typically representing an unexpected finding at sites rich in chronic fibrin deposition. It is associated with Epstein-Barr virus, and has been reported to occur in a wide variety of anatomic sites and clinical scenarios. We report a case arising in a thyroid hyperplastic nodule, only the second case reported in this location. Notably, this is only the fourth case of fibrin-associated large B-cell lymphoma that is not associated with Epstein-Barr virus. We provide a literature review on the clinico-pathological characteristics and outcome of this newly characterized indolent lymphoma type, which has only recently been separated out from the pathologically similar but highly aggressive large B-cell lymphoma associated with chronic inflammation.


Asunto(s)
Infecciones por Virus de Epstein-Barr , Linfoma de Células B Grandes Difuso , Nódulo Tiroideo , Humanos , Herpesvirus Humano 4 , Fibrina , Linfoma de Células B Grandes Difuso/patología , Hiperplasia/complicaciones
7.
Eur J Ophthalmol ; 33(5): NP130-NP136, 2023 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-36083167

RESUMEN

PURPOSE: The purpose of this study was to report the clinicopathological features and management of the first case of bilateral synchronous conjunctival myxoma. METHODS: This study was a case report and literature review. RESULTS: A 66-year-old Chinese male with past ocular history of uncomplicated bilateral phacoemulsification and intraocular lens (IOLs) 3 years ago prior to presentation presented with bilateral red and swollen conjunctiva for over a year. On examination his corrected distance visual acuity (CDVA) was 25/20 in the right eye 20/20 in the left eye. Slit lamp examination revealed swollen temporal conjunctiva bilaterally which appeared as painless, well-circumscribed, salmon-pink, fleshy patches. The lesion in the right eye was subsequently excised, followed by excision of the lesion in the left eye at 3-week interval. Microscopically, histopathological examination of both excised specimens revealed hypocellular conjunctival mucosa covered by non-dysplastic epithelium, with presence of myxoid degeneration in the subepithelial stroma and immunostaining findings consistent with conjunctival myxoma. At his latest follow-up at 24 months, there were no recurrences of the conjunctival masses and the CDVA was the same as preoperatively.


Asunto(s)
Neoplasias de la Conjuntiva , Mixoma , Masculino , Humanos , Anciano , Neoplasias de la Conjuntiva/diagnóstico , Neoplasias de la Conjuntiva/cirugía , Neoplasias de la Conjuntiva/patología , Conjuntiva/patología , Mixoma/diagnóstico , Mixoma/cirugía , Mixoma/patología , Microscopía con Lámpara de Hendidura , Agudeza Visual
8.
Head Neck Pathol ; 17(1): 165-171, 2023 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-36166160

RESUMEN

BACKGROUND: Solitary fibrous tumor can exhibit a broad morphologic spectrum, such as presence of epithelioid tumor cells, adipose cells and multinucleated giant cells. This report describes an unusual morphologic variant characterized by adenofibromatous features, all occurring in the sinonasal region. METHODS: Four cases of the adenofibromatous variant of solitary fibrous tumor were retrieved from the surgical pathology and consultation files in Queen Elizabeth Hospital, Hong Kong. Histologic examination, immunohistochemical study and reverse-transcription polymerase chain reaction (RT-PCR) were performed. RESULTS: The patients were adults who presented with an obstructive mass of the nasal septum, nasal cavity or nasolacrimal sac. Histologic examination showed a circumscribed biphasic tumor with intermingling of glandular structures and spindle cells, reminiscent of mammary fibroadenoma. Bland-looking spindle cells formed short, irregularly oriented fascicles, admixed with variable amount of collagen fibers. The glandular component comprised ducts and seromucinous acini with a lobular architecture, indicating that it represented exuberant hyperplasia of indigenous glands rather than part of the neoplastic process. Demonstration of CD34 and STAT6 immunoreactivity in the spindle cells and NAB2::STAT6 gene fusion by polymerase chain reaction supports the diagnosis of solitary fibrous tumor. CONCLUSION: This study reports four cases of sinonasal solitary fibrous tumor with adenofibromatous features, furthermore expanding the morphologic spectrum of this tumor.


Asunto(s)
Neoplasias de Cabeza y Cuello , Hemangiopericitoma , Senos Paranasales , Tumores Fibrosos Solitarios , Adulto , Humanos , Hemangiopericitoma/genética , Tumores Fibrosos Solitarios/genética , Tumores Fibrosos Solitarios/patología , Fusión Génica , Senos Paranasales/patología , Biomarcadores de Tumor/análisis
9.
JAMA Netw Open ; 6(7): e2323890, 2023 07 03.
Artículo en Inglés | MEDLINE | ID: mdl-37459093

RESUMEN

Importance: Postradiation oral cavity squamous cell carcinoma (OCSCC) is a common secondary malignant neoplasm affecting survivors of head and neck cancer who underwent radiotherapy. The clinical, pathologic, and immune-related features of postradiation OCSCC are poorly characterized, and treatment options are limited because of surgical difficulty and high morbidity associated with reirradiation. Objective: To determine whether postradiation OCSCC has distinctive clinical, pathologic, and immune-related features compared with demographic-matched sporadic OCSCC. Design, Setting, and Participants: This retrospective matched cohort study was conducted at a single tertiary oncology center in Hong Kong. Participants included consecutive patients with OCSCC diagnosed between 2000 and 2020. Patients with postradiation OCSCC were matched with patients with sporadic OCSCC using age, year of diagnosis, sex, and anatomic subsites. Data analysis was performed from July to December 2022. Exposure: Head and neck irradiation involving the oral cavity before the diagnosis of OCSCC. Main Outcomes and Measures: The primary outcomes were relapse pattern, survival, and causes of death. Pathologic features; immunohistochemical staining for programmed death-ligand 1, PD-1, MSH6, PMS2, FOXP3, and Ki67; and mRNA expression of 31 immune-related genes were also analyzed. Results: A total of 173 patients, 60 with postradiation OCSCC (median [IQR] age, 63.8 [53.0-71.7] years; 43 men [71.7%]) and 113 with sporadic OCSCC (median [IQR] age, 64.4 [52.8-70.6] years; 83 men [73.5%]), were included. Patients with postradiation OCSCC had a higher proportion of N0 disease than those with sporadic OCSCC (50 patients [83.3%] vs 56 patients [49.6%]). With a median (IQR) follow-up of 10.2 (1.2-20.5) years, the 10-year relapse-free survival rates were lower in patients with postradiation OCSCC than sporadic OCSCC (29.6% [95% CI, 17.1%-43.2%] vs 52.4% [95% CI, 41.8%-62.0%]; P = .04), and the same was true for overall survival (30.5% [95% CI, 17.6%-44.4%] vs 52.3% [95% CI, 41.4%-62.1%]; P = .03). All relapses in patients with postradiation OCSCC were locoregional, whereas 35.2% of relapses (12 of 34 patients) in patients with sporadic OCSCC were distant. Despite similar 10-year disease-specific survival rates between the 2 groups (68.8% [95% CI, 55.8%-81.0%] vs 67.1% [95% CI, 57.5%-76.5%]; P = .91), patients with postradiation OCSCC had excess mortality due to pneumonia and cerebrovascular events. Postradiation OCSCC exhibited more adverse pathologic features (perineural invasion, worse pattern of invasion, and tumor budding), higher PD-1 expression, and higher gene expression of CD4 and TGF-ß compared with sporadic OCSCC. Conclusions and Relevance: This retrospective matched cohort study found distinctive pathologic characteristics and relapse patterns of postradiation OCSCC compared with sporadic OCSCC, which may be attributable to the lack of adjuvant radiotherapy, aggressive biologic phenotype, and different host immune response. Further exploration of the role of immune checkpoint therapy may be justified.


Asunto(s)
Carcinoma de Células Escamosas , Neoplasias de Cabeza y Cuello , Neoplasias de la Boca , Humanos , Carcinoma de Células Escamosas de Cabeza y Cuello/radioterapia , Carcinoma de Células Escamosas de Cabeza y Cuello/patología , Estudios Retrospectivos , Estudios de Cohortes , Receptor de Muerte Celular Programada 1/uso terapéutico , Estadificación de Neoplasias , Recurrencia Local de Neoplasia/radioterapia , Recurrencia Local de Neoplasia/patología , Carcinoma de Células Escamosas/patología , Neoplasias de la Boca/patología , Neoplasias de Cabeza y Cuello/patología
10.
Ocul Immunol Inflamm ; : 1-7, 2023 Dec 06.
Artículo en Inglés | MEDLINE | ID: mdl-38055933

RESUMEN

BACKGROUND: Immunoglobulin G4-related ophthalmic disease (IgG4-ROD) poses clinical challenges due to its heterogeneous ocular and systemic manifestations. We aim to report the systemic involvement and the clinical, serological and radiological associations of a cohort of Chinese patients. METHODS: A territory-wide, biopsy-proven, Chinese cohort. A retrospective, masked chart review of medical records, orbital images, and histopathology reports. RESULTS: A total of 122 (65 male) patients with a follow-up of 81 ± 49 (24 to 84) months were reviewed. Ninety (74%) patients presented bilaterally. Subacute upper eyelid swelling was the commonest presentation (82/122, 67%). During follow-up, 91/122 patients (75%) underwent extra-orbital imaging including computer tomography (692 films), ultrasonography (182 films), magnetic resonance imaging (76 films) and whole body FDG-PET scan (33 films). Eighty-six (95%) of these 91 patients had extra-orbital involvement radiologically (2.7 ± 1.6 regions, range: 0 to 9). Lymph node was the most prevalent (N = 60,66%), followed by salivary gland (N = 51,56%), lung (N = 49,54%), kidney (N = 22, 24%), hepatobiliary tree (N = 18, 20%) and pancreas (N = 17, 19%). Other organs include thyroid, aorta, meninges/brain and skin. Twenty-eight (23%) patients had allergic diseases (19 asthma, 16 allergic rhinitis, and 6 eczemas). Fifty-seven (48%) patients had paranasal sinusitis. Serum eosinophilia was associated with a higher number (3.24 versus 2.52, P = 0.0304) of organ involvement. Patients with deep organ involvement was associated with a higher age of IgG4-ROD onset (70 ± 12 versus 56 ± 13, P < 0.0001). CONCLUSIONS: 95% of the patients who underwent systemic imaging in our cohort had systemic organ involvement. An early physicians' assessment and radiological imaging are recommended after the diagnosis of IgG4-ROD.

11.
Mod Pathol ; 25(9): 1181-92, 2012 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-22596100

RESUMEN

IgG4-related disease is a newly recognized fibro-inflammatory condition characterized by several features: a tendency to form tumefactive lesions in multiple sites; a characteristic histopathological appearance; and-often but not always-elevated serum IgG4 concentrations. An international symposium on IgG4-related disease was held in Boston, MA, on 4-7 October 2011. The organizing committee comprising 35 IgG4-related disease experts from Japan, Korea, Hong Kong, the United Kingdom, Germany, Italy, Holland, Canada, and the United States, including the clinicians, pathologists, radiologists, and basic scientists. This group represents broad subspecialty expertise in pathology, rheumatology, gastroenterology, allergy, immunology, nephrology, pulmonary medicine, oncology, ophthalmology, and surgery. The histopathology of IgG4-related disease was a specific focus of the international symposium. The primary purpose of this statement is to provide practicing pathologists with a set of guidelines for the diagnosis of IgG4-related disease. The diagnosis of IgG4-related disease rests on the combined presence of the characteristic histopathological appearance and increased numbers of IgG4⁺ plasma cells. The critical histopathological features are a dense lymphoplasmacytic infiltrate, a storiform pattern of fibrosis, and obliterative phlebitis. We propose a terminology scheme for the diagnosis of IgG4-related disease that is based primarily on the morphological appearance on biopsy. Tissue IgG4 counts and IgG4:IgG ratios are secondary in importance. The guidelines proposed in this statement do not supplant careful clinicopathological correlation and sound clinical judgment. As the spectrum of this disease continues to expand, we advocate the use of strict criteria for accepting newly proposed entities or sites as components of the IgG4-related disease spectrum.


Asunto(s)
Enfermedades Autoinmunes/patología , Inmunoglobulina G/sangre , Paraproteinemias/patología , Enfermedades Autoinmunes/inmunología , Humanos , Paraproteinemias/inmunología
12.
Semin Diagn Pathol ; 29(4): 226-34, 2012 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-23068302

RESUMEN

Lymphadenopathy is a common occurrence in IgG4-related disease; it can appear before, concurrent with, or after the diagnosis of this disease, which is characterized by tumefactive sclerosing inflammatory lesions predominantly affecting extranodal sites, such as the pancreas, salivary gland, and lacrimal gland. Although multiple lymph node groups are commonly involved, constitutional symptoms are absent. The lymph nodes can show a broad morphologic spectrum, including multicentric Castleman disease-like (type I), follicular hyperplasia (type II), interfollicular expansion (type III), progressive transformation of germinal centers (type IV), and inflammatory pseudotumor-like (type V). All are characterized by an increase in IgG4+ plasma cells (>100 per high power field) and IgG4/IgG ratio (>40%). IgG4-related lymphadenopathy is both an underdiagnosed and overdiagnosed entity. The former is because of the fact that this entity has not been characterized until recently, while the latter results from pathologists' enthusiasm in diagnosing "new" entities and the lack of specificity of the morphologic and immunophenotypic features of IgG4-related lymphadenopathy. It is prudent to render this diagnosis only for patients with known IgG4-related disease or in the presence of corroborating clinical and laboratory findings (such as elderly men, systemic lymphadenopathy, elevated serum IgG4, IgG, and IgE but not IgM and IgA, and low titers of autoantibodies). Outside these circumstances, a descriptive diagnosis of "reactive lymphoid hyperplasia with increased IgG4+ cells" accompanied by a recommendation for follow-up will be appropriate because IgG4-related disease will likely ensue only in a minority of such patients.


Asunto(s)
Enfermedades Autoinmunes/patología , Inmunoglobulina G/sangre , Ganglios Linfáticos/patología , Enfermedades Linfáticas/patología , Enfermedades Autoinmunes/inmunología , Enfermedades Autoinmunes/metabolismo , Biomarcadores/sangre , Enfermedad de Castleman/diagnóstico , Diagnóstico Diferencial , Centro Germinal , Humanos , Enfermedades Linfáticas/inmunología , Enfermedades Linfáticas/metabolismo , Linfoma de Células T/diagnóstico
13.
Virchows Arch ; 480(4): 927-932, 2022 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-35229187

RESUMEN

Spindle cell/sclerosing rbabdomyosarcoma (RMS) is a recently characterized variant of RMS with several distinct molecular subtypes. We describe an example occurring in the tongue of a 10-year-old boy with a novel DCTN1::ALK fusion. The tumor exhibited infiltrative growth and was comprised of fascicles and focally whorls of spindle cells with eosinophilic cytoplasm, in a collagenous or myxoid stroma. Moderate cytologic atypia, mitotic activity (2/10 HPFs), and perineural invasion were identified. The tumor cells expressed actin, desmin, MyoD1, myogenin, and ALK. An in-frame fusion between DCTN1 exon 26 and ALK exon 20 was detected by RNA sequencing, which was confirmed by split reads and supported by FISH studies. The tumor showed an indolent behavior with local recurrence 3 years after excision. This study broadens the molecular spectrum of spindle cell/sclerosing RMS and this molecular aberration may represent a potential therapeutic target for unresectable or disseminated disease.


Asunto(s)
Rabdomiosarcoma , Actinas , Biomarcadores de Tumor/genética , Niño , Complejo Dinactina , Humanos , Masculino , Proteínas Tirosina Quinasas Receptoras , Rabdomiosarcoma/genética , Rabdomiosarcoma/patología , Rabdomiosarcoma/terapia
14.
J Exp Clin Cancer Res ; 41(1): 90, 2022 Mar 10.
Artículo en Inglés | MEDLINE | ID: mdl-35272669

RESUMEN

BACKGROUND: Gemcitabine (GEM) is the first-line chemotherapeutic drug used to treat pancreatic ductal adenocarcinoma carcinoma (PDAC), but chemoresistance is often encountered clinically. Nrf2, an oxidative stress responsive transcription factor, is an important contributor to chemoresistance and poor prognosis of PDAC. Brucein D (BD), a naturally occurring quassinoid, has been reported to exert anti-tumor effect in several cancers including PDAC. In this study, we aimed to investigate the efficacy of BD and the role of Nrf2 axes on the chemosensitivity of GEM and elucidate the underlying molecular mechanisms. METHODS: Analyses of clinical samples of PDAC and GEPIA database were first conducted to identify the expression of Nrf2 in PDAC. We then established cell lines with stable deletion of Nrf2 through transfecting lentivirus into PDAC cells. Quantitative real-time PCR (qRT-PCR) and Western blotting were performed to determine the expression of Nrf2 in these cell lines. The effects of BD and Nrf2 axes on PDAC cell proliferation, colony-formation, tumor growth and chemosensitivity were determined both in vitro and in vivo. Orthotopic xenograft and genetically engineered KPC mouse models of PDAC were used to evaluate the anti-pancreatic cancer effects of BD and GEM. RESULTS: Nrf2 was highly expressed in PDAC in the clinical samples and GEPIA analysis. Gain- and lost-function study demonstrated that Nrf2 affected the chemosensitivity of GEM on PDAC cells both in vitro and in vivo. We further found that BD effectively inhibited PDAC cell proliferation and enhanced the chemosensitivity of GEM. Mechanistic studies revealed that BD sensitized GEM in PDAC cells through the ubiquitin-proteasome-dependent degradation of Nrf2, and downregulating the Nrf2 pathway. Silencing of Nrf2 plus BD treatment resulted in more potent inhibitory effects of GEM. In contrast, Nrf2 activation attenuated the chemosensitivity of GEM, indicating that the action of BD was Nrf2 dependent. Finally, the efficacy of BD alone and in combination with GEM on PDAC was validated on both orthotopic xenograft and genetically engineered KPC mouse models. CONCLUSIONS: BD was able to enhance the chemosensitivity of GEM in PDAC through inhibition of the Nrf2 pathway. Our experimental findings indicate that BD, a potent Nrf2 inhibitor, holds promise for further development into a novel adjuvant therapy for PDAC.


Asunto(s)
Antimetabolitos Antineoplásicos/uso terapéutico , Desoxicitidina/análogos & derivados , Factor 2 Relacionado con NF-E2/metabolismo , Neoplasias Pancreáticas/tratamiento farmacológico , Cuassinas/uso terapéutico , Animales , Antimetabolitos Antineoplásicos/farmacología , Línea Celular Tumoral , Desoxicitidina/farmacología , Desoxicitidina/uso terapéutico , Femenino , Humanos , Ratones , Ratones Desnudos , Neoplasias Pancreáticas/mortalidad , Neoplasias Pancreáticas/patología , Cuassinas/farmacología , Análisis de Supervivencia , Transfección , Gemcitabina
15.
J Thorac Oncol ; 17(2): 264-276, 2022 02.
Artículo en Inglés | MEDLINE | ID: mdl-34626839

RESUMEN

INTRODUCTION: Gene fusion variants in ALK-rearranged NSCLC may predict patient outcomes, but previous results have been inconclusive. Fusion isoforms coexisting in the same tumor may affect the efficacy of targeted therapy, but they have not been investigated. METHODS: Patients with ALK-rearranged NSCLC who received crizotinib treatments were recruited. Precrizotinib tumor tissues were analyzed by the anchored multiplex polymerase chain reaction for targeted RNA sequencing. Kaplan-Meier and Cox regression were used to compare overall and progression-free survivals. RESULTS: Of the 51 studied subjects, EML4-ALK variant types v1, v2, v3, and others were detected in 23 (45.1%), five (9.8%), 19 (37.3%), and four patients (7.8%), respectively. Multiple EML4-ALK RNA isoforms were detected in 24 tumors (47.1%), and single isoform in 27 (52.9%). Most of the v3 tumors (16 of 19) harbored both v3a and v3b RNA isoforms. Multiple isoforms were also detected in eight non-v3 tumors (33.3% of all 24 multiple isoforms; five v1, two v5', and one v2). Compared with patients with single isoform, those with multiple isoforms had worse progression-free (hazard ratio and 95% confidence interval: 2.45 [1.06-5.69]) and overall (hazard ratio [95% confidence interval]: 3.74 [1.26-11.13]) survivals after adjusting for potential confounders including variant type. Using the patient-derived H2228 cells known to express v3a and v3b, our single-cell polymerase chain reaction detected either v3a or v3b in most single cells. Treatment of H2228 cells by three ALK inhibitors revealed increased ratios of v3a-to-v3b expression over time. CONCLUSIONS: Intratumoral EML4-ALK isoforms may predict the efficacy of targeted therapy in ALK-rearranged NSCLC. Temporal changes of intratumoral fusion isoforms may result from differential selection pressures that a drug might have on one isoform over another. Larger studies on fusion heterogeneity using RNA sequencing are warranted.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas , Crizotinib/uso terapéutico , Neoplasias Pulmonares , Carcinoma de Pulmón de Células no Pequeñas/tratamiento farmacológico , Carcinoma de Pulmón de Células no Pequeñas/genética , Fusión Génica , Humanos , Neoplasias Pulmonares/tratamiento farmacológico , Neoplasias Pulmonares/genética , Proteínas de Fusión Oncogénica/genética , Proteínas de Fusión Oncogénica/metabolismo , Inhibidores de Proteínas Quinasas/uso terapéutico , ARN , Proteínas Tirosina Quinasas Receptoras/genética , Análisis de Secuencia de ARN , Resultado del Tratamiento
16.
Leukemia ; 36(7): 1720-1748, 2022 07.
Artículo en Inglés | MEDLINE | ID: mdl-35732829

RESUMEN

We herein present an overview of the upcoming 5th edition of the World Health Organization Classification of Haematolymphoid Tumours focussing on lymphoid neoplasms. Myeloid and histiocytic neoplasms will be presented in a separate accompanying article. Besides listing the entities of the classification, we highlight and explain changes from the revised 4th edition. These include reorganization of entities by a hierarchical system as is adopted throughout the 5th edition of the WHO classification of tumours of all organ systems, modification of nomenclature for some entities, revision of diagnostic criteria or subtypes, deletion of certain entities, and introduction of new entities, as well as inclusion of tumour-like lesions, mesenchymal lesions specific to lymph node and spleen, and germline predisposition syndromes associated with the lymphoid neoplasms.


Asunto(s)
Neoplasias Hematológicas , Linfoma , Humanos , Linfoma/patología , Organización Mundial de la Salud
17.
Int J Gynecol Pathol ; 30(6): 539-43, 2011 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-21979589

RESUMEN

Solid pseudopapillary neoplasm, an uncommon, intriguing, low-grade malignant tumor of the pancreas, can exceptionally occur in extrapancreatic sites. We report 1 such case occurring as an ovarian primary in a 25-year-old woman, who presented with abdominal fullness. She remained well 12 years after resection of the 1.7-kg right ovarian tumor. Histologically, the tumor showed a solid, dehiscent, and pseudopapillary growth, traversed by fibrous septa and arborizing blood vessels. The polygonal tumor cells had round nuclei, fine chromatin, and lightly eosinophilic granular cytoplasm. In certain areas, eosinophilic hyaline globules were present. On immunostaining, the tumor cells were positive for ß-catenin (nuclear translocation), CD10, CD56, and synaptophysin (focal), and were negative for cytokeratin, E-cadherin, and chromogranin. The morphologic and immunohistochemical features were compatible with those of solid pseudopapillary neoplasm. Review of the literature uncovered 10 cases of extrapancreatic solid pseudopapillary neoplasm with adequate data for analysis. They were seen to occur predominantly in young female patients, who presented with a large tumor mass, similar to their pancreatic counterparts. The most common sites of occurrence were the mesocolon (with ectopic pancreatic tissue) and ovary. Awareness of the existence of this tumor in various extrapancreatic sites is essential to avoid misdiagnosis.


Asunto(s)
Carcinoma Papilar/patología , Neoplasias Ováricas/patología , Adulto , Carcinoma Papilar/metabolismo , Carcinoma Papilar/cirugía , Femenino , Humanos , Inmunohistoquímica , Neoplasias Ováricas/metabolismo , Neoplasias Ováricas/cirugía , Ovariectomía
18.
Int J Gynecol Pathol ; 30(3): 301-5, 2011 May.
Artículo en Inglés | MEDLINE | ID: mdl-21464722

RESUMEN

Carcinosarcoma is exceedingly rare in the vulva. We describe a case of carcinosarcoma in a 67-year-old female patient who presented with recent enlargement and pain of a vulval nodule noted for 15 years. The excised tumor showed intermixed carcinomatous (adenocarcinoma and anaplastic carcinoma) and sarcomatous elements (osteosarcoma, chondrosarcoma, and leiomyosarcoma), which focally merged with several lobules of typical eccrine spiradenoma. The inguinal lymph nodes showed metastasis of the carcinomatous component only. This case represents the first reported case of vulval carcinosarcoma of the skin adnexal origin, and has to be distinguished from sarcomatoid carcinoma of epidermal origin because of a probable more aggressive behavior.


Asunto(s)
Adenoma de las Glándulas Sudoríparas/patología , Carcinosarcoma/patología , Neoplasias de las Glándulas Sudoríparas/patología , Neoplasias de la Vulva/patología , Adenoma de las Glándulas Sudoríparas/radioterapia , Adenoma de las Glándulas Sudoríparas/cirugía , Anciano , Carcinosarcoma/radioterapia , Carcinosarcoma/cirugía , Transformación Celular Neoplásica/patología , Glándulas Ecrinas/patología , Femenino , Humanos , Inmunohistoquímica , Metástasis Linfática/patología , Neoplasias de las Glándulas Sudoríparas/radioterapia , Neoplasias de las Glándulas Sudoríparas/cirugía , Neoplasias de la Vulva/radioterapia , Neoplasias de la Vulva/cirugía
19.
Int J Surg Pathol ; 29(1): 64-68, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-32493078

RESUMEN

Hemosiderotic fibrolipomatous tumor is a rare soft tissue tumor that preferentially affects the dorsum of foot, shows recurrent t(1;10) translocation targeting TGFBR3 and OGA (MGEA5) genes, and has a high recurrence potential. Hemosiderin deposits, mature adipocytes, and interspersed spindle cells are the 3 cardinal morphologic features of this tumor. We describe a "pauci-hemosiderotic" example involving the left wrist of a 45-year-old female, posing a diagnostic pitfall. The tumor comprised mature adipose tissue traversed by variably thick fibrous septa containing short fascicles of spindle cells. Prominent small- to medium-sized blood vessels were present, often with perivascular fibrosis or aggregates of foamy histiocytes, sometimes associated with red cell extravasation. Hemosiderin was not conspicuous, but fine deposits could be found focally on careful search and with the aid of Perls stain. The diagnosis was further confirmed by diffuse expression of CD34 and presence of OGA translocation by fluorescence in situ hybridization. Pathologists should be aware that hemosiderin deposition can be scanty and focal in hemosiderotic fibrolipomatous, but the rich vasculature with a "damaged" appearance is a useful diagnostic clue.


Asunto(s)
Biomarcadores de Tumor/análisis , Fibroma/diagnóstico , Hemosiderina/análisis , Lipoma/diagnóstico , Antígenos de Neoplasias/genética , Diagnóstico Diferencial , Femenino , Fibroma/genética , Fibroma/patología , Fibroma/cirugía , Histona Acetiltransferasas/genética , Humanos , Hialuronoglucosaminidasa/genética , Lipoma/genética , Lipoma/patología , Lipoma/cirugía , Persona de Mediana Edad , Proteoglicanos/genética , Receptores de Factores de Crecimiento Transformadores beta/genética , Translocación Genética , Muñeca
20.
Am J Surg Pathol ; 45(6): 765-772, 2021 06 01.
Artículo en Inglés | MEDLINE | ID: mdl-33264138

RESUMEN

EBV+ inflammatory follicular dendritic cell (FDC) sarcoma is an indolent malignant neoplasm of spindled FDCs with a rich lymphoplasmacytic infiltrate and a consistent association with Epstein-Barr virus (EBV). It occurs exclusively in the liver and spleen, with the exception of a few colonic examples. In this study, we report 9 extrahepatosplenic cases, including 4 occurring in previously undescribed sites, but all apparently anatomically related to the aerodigestive tract. The cases included 5 gastrointestinal tumors all presenting as colonic pedunculated polyps, 2 presenting as mesocolon mass, and 2 involving the palatine or nasopharyngeal tonsils. One patient with a colonic tumor was complicated by paraneoplastic pemphigus. The patients had a median age of 58 years, with female predominance (female:male=7:2). A favorable outcome was observed in 7 patients. Histologically, EBV+ inflammatory FDC sarcomas arising from these anatomic sites were similar to their hepatosplenic counterparts. Spindled to oval neoplastic cells with ill-defined cell borders were dispersed or formed loose whorled fascicles in a dense lymphoplasmacytic background. They had vesicular nuclei with distinct nucleoli and typically exhibited a range of nuclear atypia in the same case. The neoplastic cells showed variable expression of FDC markers and were labeled for Epstein-Barr virus-encoded RNA on in situ hybridization. These 9 cases thus broaden the clinicopathologic scenarios of EBV+ inflammatory FDC sarcoma. Recognition of the potential existence of this tumor type in extrahepatosplenic sites permits a correct diagnosis to be made.


Asunto(s)
Neoplasias del Colon/patología , Pólipos del Colon/patología , Sarcoma de Células Dendríticas Foliculares/patología , Infecciones por Virus de Epstein-Barr/virología , Herpesvirus Humano 4/genética , ARN Viral/genética , Neoplasias Tonsilares/patología , Adulto , Anciano , Biomarcadores de Tumor/análisis , Niño , Neoplasias del Colon/química , Neoplasias del Colon/cirugía , Neoplasias del Colon/virología , Pólipos del Colon/química , Pólipos del Colon/cirugía , Pólipos del Colon/virología , Sarcoma de Células Dendríticas Foliculares/metabolismo , Sarcoma de Células Dendríticas Foliculares/cirugía , Sarcoma de Células Dendríticas Foliculares/virología , Femenino , Humanos , Inmunohistoquímica , Hibridación in Situ , Masculino , Persona de Mediana Edad , Neoplasias Tonsilares/química , Neoplasias Tonsilares/cirugía , Neoplasias Tonsilares/virología
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