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Castro-Uriol D, Rios L, Enriquez-Vera D, Montoya J, Runciman T, Alarcón S, Zapata A, Hernández E, León E, Malpica L, Valcarcel B. Real-World Outcomes of Adolescents and Young Adults with Diffuse Large B-Cell Lymphoma: A Multicenter Retrospective Cohort Study. J Adolesc Young Adult Oncol 2024; 13:323-330. [PMID: 37843922 PMCID: PMC10998009 DOI: 10.1089/jayao.2023.0095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023] Open
Abstract
Purpose: Patients with diffuse large B-cell lymphoma (DLBCL) are typically treated with rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP). However, a standard of care for managing adolescents and young adults (AYAs) with DLBCL is lacking. We examine treatment approaches and outcomes of this population. Methods: We included 90 AYAs (15-39 years) diagnosed with DLBCL between 2008 and 2018 in three tertiary centers in Peru. Overall response rates (ORR) were available for all patients. Overall survival (OS) and progression-free survival (PFS) rates were estimated using the Kaplan-Meier method. Results: The median age at diagnosis was 33 years, 57% were males, 57% had good performance status (Lansky/Karnofsky ≥90), and 61% were diagnosed with early-stage disease (Ann Arbor stages I-II). R-CHOP (n = 69, 77%) was the most frequently used first-line regimen, with an ORR of 91%. With a median follow-up of 83 months, the 5-year OS and PFS among all patients were 79% and 67%, respectively. Among the patients who received R-CHOP, the 5-year OS and PFS were 77% and 66%, respectively. Of the 29 (32%) patients with relapsed/refractory (R/R) disease, 83% received second-line treatment and only 14% underwent consolidation therapy with autologous transplantation. The 3-year OS for R/R DLBCL was 36%. Conclusion: Our data show that AYAs with DLBCL who received conventional therapy had comparable outcomes to those observed in studies conducted among the adult population. However, the prognosis for AYAs with R/R disease was dismal, indicating the unmet need for developing and increasing access to novel treatment modalities in AYAs.
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Affiliation(s)
- Denisse Castro-Uriol
- Departamento de Oncología y Radioterapia, Hospital Nacional Edgardo Rebagliati Martins, Lima, Peru
- Centro de Medicina de Precisión, Instituto de Investigación, Universidad de San Martín de Porres, Lima, Perú
| | - Ligia Rios
- Unidad de Oncología Pediátrica y del Adolescente, Departamento de Oncología y Radioterapia, Hospital Nacional Edgardo Rebagliati Martins, Lima, Perú
| | - Daniel Enriquez-Vera
- Division of HTLV-1/ATL Carcinogenesis and Therapeutics, Joint Research Center for Human Retrovirus Infection, Kagoshima University, Kagoshima, Japan
| | - Jacqueline Montoya
- Departamento de Oncología Pediátrica, Instituto Nacional de Enfermedades Neoplásicas, Lima, Peru
| | - Thanya Runciman
- Departamento de Oncología y Radioterapia, Hospital Nacional Guillermo Almenara Irigoyen, Lima, Peru
| | - Sandra Alarcón
- Departamento de Oncología Pediátrica, Instituto Nacional de Enfermedades Neoplásicas, Lima, Peru
| | - Arturo Zapata
- Departamento de Oncología Pediátrica, Instituto Nacional de Enfermedades Neoplásicas, Lima, Peru
| | - Eddy Hernández
- Departamento de Oncología Pediátrica, Instituto Nacional de Enfermedades Neoplásicas, Lima, Peru
| | - Esmeralda León
- Unidad de Oncología Pediátrica y del Adolescente, Departamento de Oncología y Radioterapia, Hospital Nacional Guillermo Almenara Irigoyen, Lima, Perú
| | - Luis Malpica
- Division of Cancer Medicine, Department of Lymphoma and Myeloma, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Bryan Valcarcel
- Department of Epidemiology, Milken Institute School of Public Health, The George Washington University, Washington, District of Columbia, USA
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Wong SL, Johnston E, Rossell N, Malogolowkin M, Rios L, Gómez García W, Antillon-Klussmann F, Fu L, Fuentes-Alabi S, Quintero Delgado K, Ortiz Morales D, Rodriguez-Loza C, Apesoa-Varano EC, Friedrich P, Alvarez E. The Effect of COVID-19 on Oncology Care for Adolescents and Young Adults in Latin America. J Adolesc Young Adult Oncol 2024. [PMID: 38502817 DOI: 10.1089/jayao.2023.0140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024] Open
Abstract
Children with cancer in low- and middle-income countries were disproportionately impacted by the COVID-19 pandemic, but little is known about how adolescents and young adults (AYAs) with cancer were affected. Sixty-seven physicians and nonphysician providers were interviewed about their experiences caring for AYAs with cancer in Latin America. Quotes related to the COVID-19 pandemic were identified and grouped into themes. Barriers from the COVID-19 pandemic included limited space, restrictions on travel, reduced funding, limited staff, limited services, and changes to treatment. However, improvements to care that arose from the COVID-19 pandemic included better access to distance learning and telemedicine.
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Affiliation(s)
- Samantha L Wong
- School of Medicine, University of California Davis, Sacramento, California, USA
| | - Emily Johnston
- Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
- Institute for Cancer Outcomes and Survivorship, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Nuria Rossell
- Independent Medical Anthropology Researcher, San Salvador, El Salvador
| | - Marcio Malogolowkin
- Division of Pediatric Hematology and Oncology, Davis School of Medicine, University of California, Sacramento, California, USA
| | - Ligia Rios
- Department of Pediatrics, Unidad de Oncología Pediátrica y del Adolescente, Hospital Nacional Edgardo Rebagliati Martins, Lima, Perú
| | - Wendy Gómez García
- Department of Oncology, Dr. Robert Reid Cabral Children's Hospital, Santo Domingo, Dominican Republic
- National Cancer Institute, INCART, Santo Domingo, Dominican Republic
| | - Federico Antillon-Klussmann
- Department of Hematology/Oncology, Unidad Nacional de Oncología Pediátrica, Guatemala City, Guatemala
- School of Medicine, Francisco Marroquín University, Guatemala City, Guatemala
| | - Ligia Fu
- Department of Pediatrics, Hospital Escuela, Tegucigalpa, Honduras
| | - Soad Fuentes-Alabi
- Department of Pediatric Oncology, National Program for Childhood Cancer, Ayudame a Vivir Foundation/National Children's Hospital Benjamin Bloom, San Salvador, El Salvador
| | - Karina Quintero Delgado
- Department of Pediatrics, Hospital del Niño Dr. José Renán Esquivel, Oncología, Panama City, Panama
| | | | - Carolina Rodriguez-Loza
- Department of Pediatric Oncology, National Program for Childhood Cancer, Ayudame a Vivir Foundation/National Children's Hospital Benjamin Bloom, San Salvador, El Salvador
| | | | - Paola Friedrich
- St. Jude Children's Research Hospital, Global Pediatric Medicine, Memphis, Tennessee, USA
| | - Elysia Alvarez
- Division of Pediatric Hematology and Oncology, Davis School of Medicine, University of California, Sacramento, California, USA
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Abutineh F, Graetz DE, Muniz-Talavera H, Ferrara G, Puerto-Torres M, Chen Y, Gillipelli SR, Elish P, Gonzalez-Ruiz A, Alfonso Carreras Y, Alvarez S, Arce Cabrera D, Arguello Vargas D, Armenta Cruz M, Barra C, Calderon Sotelo P, Carpio Z, Chavez Rios M, Covarrubias D, de Leon Vasquez L, Diaz Coronado R, Fing Soto EA, Gomez-Garcia W, Hernandez C, Juarez Tobias MS, Leon E, Loeza Oliva JDJ, Mendez A, Miller K, Montalvo Cozar E, Negroe Ocampo NDC, Penafiel E, Pineda E, Rios L, Rodriguez Ordonez E, Soto Chavez V, Devidas M, Agulnik A. Impact of hospital characteristics on implementation of a Pediatric Early Warning System in resource-limited cancer hospitals. Front Oncol 2023; 13:1122355. [PMID: 37207162 PMCID: PMC10189109 DOI: 10.3389/fonc.2023.1122355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 04/17/2023] [Indexed: 05/21/2023] Open
Abstract
Background Pediatric Early Warning Systems (PEWS) aid in identification of deterioration in hospitalized children with cancer but are underutilized in resource-limited settings. Proyecto EVAT is a multicenter quality improvement (QI) collaborative in Latin America to implement PEWS. This study investigates the relationship between hospital characteristics and time required for PEWS implementation. Methods This convergent mixed-methods study included 23 Proyecto EVAT childhood cancer centers; 5 hospitals representing quick and slow implementers were selected for qualitative analysis. Semi-structured interviews were conducted with 71 stakeholders involved in PEWS implementation. Interviews were recorded, transcribed and translated to English, then coded using a priori and novel codes. Thematic content analysis explored the impact of hospital characteristics and QI experience on time required for PEWS implementation and was supplemented by quantitative analysis exploring the relationship between hospital characteristics and implementation time. Results In both quantitative and qualitative analysis, material and human resources to support PEWS significantly impacted time to implementation. Lack of resources produced various obstacles that extended time necessary for centers to achieve successful implementation. Hospital characteristics, such as funding structure and type, influenced PEWS implementation time by determining their resource-availability. Prior hospital or implementation leader experience with QI, however, helped facilitate implementation by assisting implementers predict and overcome resource-related challenges. Conclusions Hospital characteristics impact time required to implement PEWS in resource-limited childhood cancer centers; however, prior QI experience helps anticipate and adapt to resource challenges and more quickly implement PEWS. QI training should be a component of strategies to scale-up use of evidence-based interventions like PEWS in resource-limited settings.
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Affiliation(s)
- Farris Abutineh
- Department of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Dylan E. Graetz
- Department of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Hilmarie Muniz-Talavera
- Department of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Gia Ferrara
- Department of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Maria Puerto-Torres
- Department of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Yichen Chen
- Department of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | | | - Paul Elish
- Rollins School of Public Health, Emory University, Atlanta, GA, United States
| | | | | | - Shillel Alvarez
- Pediatric Oncology, Benemérito Hospital General con Especialidades “Juan María de Salvatierr”, La Paz, Mexico
| | - Daniela Arce Cabrera
- Pediatric Hemato-Oncology Unit, Hospital Pediatrico de Sinaloa, Culiacan, Mexico
| | | | | | - Camila Barra
- Pediatric Oncology, Centro de Investigacion Bradford Hill, Santiago, Chile
| | | | - Zulma Carpio
- Pediatric Oncology, Instituto Nacional de Enfermedades Neoplasticas, Lima, Peru
| | | | - Daniela Covarrubias
- Pediatric Oncology, Centro Estatal de Oncología de Campeche, Campeche, Mexico
| | - Lucy de Leon Vasquez
- Pediatric Oncology, Hospital Infantil Regional Universitario Dr. Arturo Grullon, Santiago, Dominican Republic
| | | | | | - Wendy Gomez-Garcia
- Oncology Unit, Hospital Infantil Dr. Robert Reid Cabral, Santo, Domingo, Dominican Republic
| | | | | | - Esmeralda Leon
- Medical Oncology, Hospital Guillermo Almenara Irigoyen, Lima, Peru
| | | | - Alejandra Mendez
- Department of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Kenia Miller
- Pediatric Hemato-Oncology, Hospital del Niño “Jose Renan Esquivel”, Panama City, Panama
| | - Erika Montalvo Cozar
- Pediatric Intensive Care Unit, Hospital Oncológico Solca Núcleo de Quito, Quito, Ecuador
| | | | - Eulalia Penafiel
- Pediatric Oncology, Instituto del Cáncer SOLCA Cuenca, Cuenca, Ecuador
| | - Estuardo Pineda
- Pediatric Hemato-Oncology, Hospital Nacional de Niños Benjamín Bloom, San Salvador, El Salvador
| | - Ligia Rios
- Pediatric Hemato-Oncology, Hospital Nacional Edgardo Rebagliati Martins, Lima, Peru
| | | | | | - Meenakshi Devidas
- Department of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Asya Agulnik
- Department of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
- *Correspondence: Asya Agulnik,
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Shekarriz R, Friedrichsen D, Brooks B, Silaski G, Rios L, Wiest E, Kanagy N. Sensor of transdermal biomarkers for blood perfusion monitoring. Sensing and Bio-Sensing Research 2020. [DOI: 10.1016/j.sbsr.2020.100328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Fernández-Guarino M, Mavura D, Fernández-González P, Chapa P, Ravazzano C, Jaén L, Rios L, Jaén P, Grossman H. Daylight photodynamic therapy is an option for the treatment of actinic keratosis in patients with xeroderma pigmentosum in Africa. Photodiagnosis Photodyn Ther 2020; 29:101631. [PMID: 31904551 DOI: 10.1016/j.pdpdt.2019.101631] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 11/09/2019] [Accepted: 12/18/2019] [Indexed: 10/25/2022]
Abstract
BACKGROUND Xeroderma pigmentosum (XP) is a very rare and severe genetic disorder with a DNA repair defect of ultraviolet (UV)-induced damage. Photodynamic therapy (PDT) has been successfully used in XP patients to treat actinic keratosis (AK) and daylight PDT (DL-PDT) has demonstrated similar efficacy to conventional PDT (C-PDT) for AK. OBJECTIVES To assess DL-PDT for the treatment of AK in patients with XP. METHODS Patients with XP were evaluated by a group of Spanish and African dermatologists. Clinical characteristics of the patients were assessed and divided in mild, severe or moderate affectation of AK in the face. A topical photosensitizer was extended on the patients' faces and after two hours of indoor light exposure, fluorescence was assessed and the cream was removed. Patients were examined two and seven days later to assess the reaction to PDT and followed up three months later. RESULTS A total of 13 patients were treated on the whole face. Three were classified as severe AK, six as moderate AK and four as mild AK. Fluorescence assessment showed a soft yellow-green colour and a pink-color delineating the AK. Two days after treatment patients presented a scaly reaction. After one week the reaction healed, there was improvement and after three months no adverse events were noticed. CONCLUSIONS PDT is an option for treatment of AK in patients with XP.
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Affiliation(s)
- M Fernández-Guarino
- Dermatology Service. Hospital Ramón y Cajal, Universidad de Alcalá, Irycis (Instituto de Investigación Sanitaria Ramón y Cajal), Madrid, Spain.
| | - D Mavura
- Regional Dermatology Training Center, Kilimanjaro Chirstian Medical Center, Moshi, Tanzania
| | - P Fernández-González
- Dermatology Service. Hospital Ramón y Cajal, Universidad de Alcalá, Irycis (Instituto de Investigación Sanitaria Ramón y Cajal), Madrid, Spain
| | - P Chapa
- Regional Dermatology Training Center, Kilimanjaro Chirstian Medical Center, Moshi, Tanzania
| | - C Ravazzano
- Academia Española de Dermatología (Spanish Society of Dermatology), Spain
| | - L Jaén
- Project Manager of "Xeroderma pigmentosum Solidary Project: Africa en la piel" in the Regional Dermatology Trainning Center, Moshi, Tanzania
| | - L Rios
- Dermatology Service. Hospital Ramón y Cajal, Universidad de Alcalá, Irycis (Instituto de Investigación Sanitaria Ramón y Cajal), Madrid, Spain
| | - P Jaén
- Dermatology Service. Hospital Ramón y Cajal, Universidad de Alcalá, Irycis (Instituto de Investigación Sanitaria Ramón y Cajal), Madrid, Spain
| | - H Grossman
- Regional Dermatology Training Center, Kilimanjaro Chirstian Medical Center, Moshi, Tanzania
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Maresco A, Ahmad S, Wehrle L, Grigorian A, Rios L, Tourgeman I. A - 72A Systematic Review of Singing Therapy as a Treatment for Language Disorders. Arch Clin Neuropsychol 2018. [DOI: 10.1093/arclin/acy061.72] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7
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Ladron-De-Guevara D, Zuñiga-Fajuri A, Campos M, Rios L, Solari F, Kuester G, Martinez D, Sepulveda M, Galvez M, Las Heras F, Perez C, Alvarez C, Fabres L, Varela X, Otayza F, Contreras A, Rojas G. Diagnostic value of pre-surgical F18-FDG PET/CT and MRI in refractory focal epilepsy. Histopathological and surgical outcome correlation. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Cucunuba Z, Valencia C, Flórez C, León C, Castellanos Y, Cardenas A, Pavía P, Hernández C, Robinson A, Cuervo R, Rios L, Montilla M, Villalobos M, Nicholls R, Puerta C. Pilot program for surveillance of congenital Chagas disease in Colombia 2010-2011. Int J Infect Dis 2012. [DOI: 10.1016/j.ijid.2012.05.412] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Delattre C, Michaud P, Chaisemartin L, Berthon J, Rios L. A transcriptomic approach to predict the impact of β-(1,3)-polyglucuronic acid sodium salt and derivatives in the main biological processes. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.10.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Delattre C, Chaisemartin L, Favre-Mercuret M, Berthon J, Rios L. Biological effect of β-(1,3)-polyglucuronic acid sodium salt on lipid storage and adipocytes differentiation. Carbohydr Polym 2012; 87:775-783. [DOI: 10.1016/j.carbpol.2011.08.056] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2011] [Revised: 08/13/2011] [Accepted: 08/21/2011] [Indexed: 11/24/2022]
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Sum S, Hensel P, Rios L, Brown S, Howerth E, Driskell E, Moussy A, Hermine O, Brown C. Drug-Induced Minimal Change Nephropathy in a Dog. J Vet Intern Med 2010; 24:431-5. [DOI: 10.1111/j.1939-1676.2010.0471.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Pascual A, Sánchez-Martínez C, Moreno C, Burdaspal-Moratilla A, López-Rodriguez MJ, Rios L. Dermatofibrosarcoma protuberans with areas of giant cell fibroblastoma in the vulva: a case report. EUR J GYNAECOL ONCOL 2010; 31:685-689. [PMID: 21319518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVE To review the clinical, morphologic, immunohistochemical, and histogenetic characteristics of dermatofibrosarcoma protuberans with areas of giant cell fibroblastoma and explore current treatment options. METHODS We describe the case of a 38-year-old patient with a tumor measuring 5.7 cm on the right labium majus of the vulva. Serial sections stained with hematoxylin-eosin were examined and immunohistochemical staining was performed for CD34 and PDGF receptor alpha and beta (PDFGRA and PDGFRB). RESULTS The histologic study showed spindle-cell proliferation typical of dermatofibrosarcoma protuberans and other areas containing fibrosis and giant cells lining pseudovascular spaces. Both tumor areas expressed CD34, PDGFRA, and PDGFRB. CONCLUSIONS Only two cases of dermatofibrosarcoma protuberans with areas of giant cell fibroblastoma in the vulva have been reported to date. Both dermatofibrosarcoma protuberans and giant cell fibroblastoma are characterized by the translocation t (17;22) (q22;q13). The fact that PDGFRA and PDGFRB are overexpressed in these tumors opens new treatment options with imatinib. Surgical excision with wide margins or Mohs micrographic surgery continues to be the treatment of choice.
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Affiliation(s)
- A Pascual
- Department of Pathology, Hospital Universitario Ramón y Cajal, Madrid, Spain.
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Delattre C, Rios L, Laroche C, Le N, Lecerf D, Picton L, Berthon JY, Michaud P. Production and characterization of new families of polyglucuronic acids from TEMPO–NaOCl oxidation of curdlan. Int J Biol Macromol 2009; 45:458-62. [DOI: 10.1016/j.ijbiomac.2009.08.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2009] [Revised: 08/13/2009] [Accepted: 08/20/2009] [Indexed: 11/24/2022]
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Alonso JA, Andrew P, Neto A, de Pablos JL, de la Cal E, Fernandes H, Gafert J, Heesterman P, Hidalgo C, Kocsis G, Manzanares A, Murari A, Petravich G, Rios L, Silva C, Thomas PD, Gorini G, Orsitto FP, Sindoni E, Tardocchi M. Fast visible camera installation and operation in JET. ACTA ACUST UNITED AC 2008. [DOI: 10.1063/1.2905063] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Rios L, Cluzel J, Vennat JC, Menerath JM, Doly M. Comparison of intraocular treatment of DMTU and SOD following retinal ischemia in rats. J Ocul Pharmacol Ther 1999; 15:547-56. [PMID: 10609777 DOI: 10.1089/jop.1999.15.547] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The effect of intravitreal injections of DMTU (dimethylthiourea) and SOD (superoxide dismutase), two free radical scavengers, was evaluated in a rat model of retinal ischemia induced by elevated intraocular pressure. The drugs were administered just before or just after a 60 min ischemia. At days 2 and 7 after reperfusion, retinal recovery was evaluated by electroretinography. At day 7, layer thicknesses and cell rows were measured from histologic sections of paraffin-embedded retinas. In the vehicle-treated control group, we observed a decrease in the inner retinal layers and b-wave amplitude impairment. SOD injection (6 units/eye) protected the retina from ischemia/reperfusion injury. At day 2 after reperfusion, electroretinographic recovery was more efficient when SOD was administered just after ischemia (99%) than after pretreatment with SOD (81%) (p<0.03). In the DMTU-treated group (75 microg/eye), only the pretreatment induced significant electrophysiologic (40%) (p<0.001) and morphologic recovery.
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Affiliation(s)
- L Rios
- Laboratoire de Biophysique Sensorielle, Faculté de Pharmacie, Université d'Auvergne, Clermont-Ferrand, France
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McLoon LK, Rios L, Wirtschafter JD. Complex three-dimensional patterns of myosin isoform expression: differences between and within specific extraocular muscles. J Muscle Res Cell Motil 1999; 20:771-83. [PMID: 10730580 DOI: 10.1023/a:1005656312518] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Because complex structural differences in adult extraocular muscles may have physiological and pathophysiological significance, the three-dimensional pattern of myosin heavy chain (MHC) isoform expression within the orbital and global layers of the muscle bellies compared with the distal tendon ends was quantitatively assessed. Three of the six extraocular muscles of adult rabbits were examined for immunohistologic expression of all fast, fast IIA/X, slow, neonatal and developmental MHC isoforms. The percentages of myofibers positive for each of these 5 myosin isoforms were determined in the orbital and global layers. There were relatively similar patterns of fast and slow MHC expression in the orbital and global layers of each of the three muscles examined. There were high levels of developmental MHC in the orbital layers, but significantly fewer developmental MHC positive myofibers in the global layer. The most variable expression was found with the neonatal MHC. There were significant differences between the longitudinal expression of the various isoforms in the middle of each muscle compared with the tendon end. In the orbital layer of all three muscles examined, the large numbers of fibers positive for fast MHC in the middle of the muscle dramatically decreased at the tendon end, with a concomitant increase in expression of slow myosin. There was a greater number of developmental MHC-positive myofibers at the tendon end than in the middle of the muscle in all three muscles examined. In the global layer, the IIA/X-positive myofibers comprised only half of the total number of fast-positive myofibers whereas in the orbital layer they comprised all or almost all of the fast positive myofibers. The configuration of the extraocular muscles is more complex than might be indicated by previous studies. The lateral rectus muscle had the most individual pattern of MHC expression when compared with the inferior rectus and inferior oblique muscles. Together with dramatic cross-sectional MHC fiber type differences between the orbital and global layers of the muscles, there are pronounced longitudinal differences in the proportions of myofibers expressing these five MHC isoforms in the middle region of the muscles and those in the distal tendon ends. This longitudinal progression appears to occur both within single myofibers, as well as within the series of myofibers that comprise the length of the muscle. We also confirm that the number of myofibers is reduced at the tendonous end while the cross-sectional area of each of the remaining myofibers is proportionally increased with regard to those in the muscle belly. Future studies may yet require two additional schemes for anatomic classification of the named extraocular muscles. One will be based on immunohistochemical features of their constituent myofibers as a supplement to classifications based on their electron microscopic appearance, innervation patterns or relative position with regard to the globe and orbit. Another will be based on the proportional length and longitudinal position of individual myofibers within an individual extraocular muscle.
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Affiliation(s)
- L K McLoon
- Department of Ophthalmology, University of Minnesota, Minneapolis 55455, USA.
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Peñas PF, Gómez M, Buezo GF, Rios L, Yáñez-Mo M, Cabañas C, Sánchez-Madrid F, García-Díez A. Differential expression of activation epitopes of beta1 integrins in psoriasis and normal skin. J Invest Dermatol 1998; 111:19-24. [PMID: 9665381 DOI: 10.1046/j.1523-1747.1998.00232.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In the epidermis, beta1 integrin expression is normally confined to the basal layer; however, suprabasal expression of beta1 integrins in keratinocytes has been found in psoriasis, and it has been suggested that it could be a pathogenic factor of the disease. We have investigated herein the functional state of beta1 integrins of human keratinocytes in normal skin and psoriasis. The expression of beta1-activation-reporter epitopes was monitored with two monoclonal antibodies, HUTS-21 and MG5A7, that recognize epitopes whose expression parallels functional activity of beta1 integrins and correlates with the ligand binding activity of these heterodimeric glycoproteins. We have found that keratinocytes express activation epitopes of beta1 integrins, and that these epitopes can be modulated by manganese. The expression of activation epitopes of beta1 integrins was related to an enhanced adhesion to fibronectin and collagen. Immunohistochemical studies of normal and psoriatic skin with HUTS-21 and other monoclonal antibodies indicate that, although there is suprabasal expression of beta1 integrins in psoriasis, these molecules seem to be in an inactive state. Moreover, most beta1 integrins in lateral and apical surfaces of basal keratinocytes of psoriasis are also in a nonactive conformation, implying a decrease of activity compared with normal skin, in which active beta1 integrins are distributed all over the basal keratinocytes.
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Affiliation(s)
- P F Peñas
- Department of Dermatology, Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, Spain
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Abstract
The degree of postprandial hypotension in patients with Alzheimer's disease (AD) is not known. We therefore studied ten AD patients and 23 controls before and after a meal. Seven AD patients but only six controls showed a fall in blood pressure (BP) of 20 mmHg or more. Maximum BP fall in AD patients was observed between 20 and 120 min after food ingestion. This differed from the time course in other groups with primary chronic autonomic failure. Postural hypotension occurred in two controls, but not in AD patients. Abnormalities in cardiac vasomotor regulation, gut peptide liberation or both could be responsible for postprandial hypotension in AD.
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Affiliation(s)
- J Idiaquez
- School of Medicine, Universidad de Valparaíso, Chile, South America
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Abstract
Three patients are described with leishmaniasis and AIDS, with cutaneous lesions mimicking dermatomyositis. Leishmania organisms were observed in great numbers in the dermis of lesional skin biopsy specimens. They were also present inside keratinocytes in all layers of the epidermis in one patient. Skin cultures from all patients and bone marrow culture in patients 1 and 3 revealed Leishmania infantum. Leishmania organisms were also found in nonlesional skin. The absence of proximal symmetric muscle weakness, elevated muscle enzymes, myopathic electromyograms, or characteristic histopathologic and immunologic features of dermatomyositis, and the rapid and complete clearance or marked improvement of the cutaneous lesions after treatment for leishmaniasis, make us consider true dermatomyositis unlikely. We suggest that leishmaniasis be included in the list of diseases capable of inducing a dermatomyositis-like eruption.
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Affiliation(s)
- E Daudén
- Department of Dermatology, Hospital de la Princesa, Universidad Autónoma, Madrid, Spain
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Peñas PF, Rios L, de la Cámara R, Fraga J, Daudén E. Cutaneous lesions as the first sign of disseminated mucormycosis. Acta Derm Venereol 1995; 75:166-7. [PMID: 7604658 DOI: 10.2340/0001555575166167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
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Rios L, Gajardo P, Olea E, Orellana P, Marinovic I. [Blood pool in the study of hepatic hemangioma]. Rev Med Chil 1993; 121:1149-53. [PMID: 8191119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Blood pool scintigraphy is a useful tool in the diagnosis of hepatic hemangioma. We reviewed retrospectively the clinical histories of 24 patients with abnormal blood pool scintigraphies and a presumptive diagnosis of hepatic hemangioma, based on clinical or ultrasonographic findings. In 20 of these patients, blood pool scintigraphy was diagnostic for hepatic hemangioma. The diagnosis was confirmed by an asymptomatic clinical evolution of 12 to 78 months in all the patients, CT scan in 8, angiography in 5 and liver biopsy in one. In the remaining 4 patients scintigraphy ruled out the presence of a hepatic hemangioma. Our results are similar to previous reports in the literature and blood pool scintigraphy has a high specificity for the diagnosis of hepatic hemangioma.
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Affiliation(s)
- L Rios
- Departamento de Radiología, Hospital Clínico P Universidad Católica de Chile. Santiago de Chile
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Garcia-Rejon A, Rios L, Lopez-Latorre LA. Styrene/butyl acrylate copolymerization with layer morphology: Kinetics and viscoelastic properties. POLYM ENG SCI 1987. [DOI: 10.1002/pen.760270612] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
Inflammation was induced in rats by intraplantar administration of carrageenan (500 micrograms in 0.1 ml). Nociceptive thresholds were measured on both inflamed and contralateral hindpaws with the pressure test of Randal and Sellito. Low doses (0.03-10 micrograms/kg) of naloxone hydrochloride (Nx) or of methylnaloxone methylsulfonate (MeNx) were injected 4 h after carrageenan in the inflamed paw: Nx (3 micrograms) and MeNx (1-10 micrograms) diminished inflammatory pain; a slight, nonspecific hyperalgesia was observed in the contralateral paw after Nx, MeNx or NaCl. Neither drug was effective when injected s.c. at the same doses and time; however activities were shown to be influenced by the experimental schedule. Low s.c. doses of Nx antagonized the analgesia produced by s.c. morphine whereas MeNx did not. This work demonstrates the local site of the analgesic action of the doses of Nx and MeNx used here, bringing new evidence in favour of the existence of cutaneous opioid receptors. Opiate antagonists might inhibit inflammatory pain by interacting with a particular population of cutaneous receptors and (or) by being dealkylated locally into agonists.
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Abstract
Naloxone hydrochloride (Nx) and methylnaloxone methylsulfate (MeNx) antagonized the inflammatory pain, but not oedema, produced by intraplantar carrageenan in rats. The liminar effective dose (3 microgram/kg) was the same for the two drugs after intraplantar or subcutaneous injection. The s.c. dose effects curves were, as a whole, similar for the two drugs. The effect was long lasting and stereospecific. The low "analgesic" s.c. doses of Nx were able to antagonize morphine analgesia, those of MeNx were not. The interpretation is difficult; a peripheral action or better the local production of morphinomimetic metabolite(s) might account for most facts.
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Rios L, Jacob J. [Comparison of the effects of naloxone hydrochloride and methiodide on endotoxic shock in the anesthetized rat]. Arch Inst Pasteur Tunis 1981; 58:313-27. [PMID: 7316611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In the anesthetized rats, both naloxone hydrochloride and methiodide produced transient hypotension and bradycardia. The hydrochloride salt was able to revert (during 1 hr for the dose of 10 mg/kg I.V.) the hypotension produced by the endotoxin of Escherichia coli, the methiodide salt was ineffective. Further naloxone hydrochloride, produced tachycardia and some awaking of the animals which were not observed after the quaternary ammonium salt. These observations strengthen the view that the effects of naloxone observed in the shocked rat are of central origin and that the antihypotensive action results--partly at least--from the antagonism of beta endorphin released by the toxin.
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Johnson DL, Leler H, Rios L, Brandt L, Kahn AJ, Mazeika E, Frede M, Bisett B. The Houston Parent-Child Development Center: a parent education program for Mexican-American families. Am J Orthopsychiatry 1974; 44:121-8. [PMID: 4809577 DOI: 10.1111/j.1939-0025.1974.tb00876.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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