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Cullison K, Simpson G, Valderrama A, Maziero D, Jones K, De La Fuente M, Meshman JJ, Azzam G, Stoyanova R, Ford J, Mellon EA. Prognostic Value of Weekly Delta-Radiomics during MR-Linac Radiotherapy of Glioblastoma. Int J Radiat Oncol Biol Phys 2023; 117:S155-S156. [PMID: 37784391 DOI: 10.1016/j.ijrobp.2023.06.579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) MRI after chemoradiotherapy (chemoRT) shows areas of presumed tumor growth in ≤ 50% of glioblastoma (GBM) patients, which can be true progression (TP) - tumor growth with poor treatment response, or pseudoprogression (PP) - edema and tumor necrosis with favorable treatment response. Patients with TP have median overall survival (OS) of only 7 months, while patients with PP have median OS of 36 months. However, on imaging, TP and PP are usually not discernible during treatment, making it difficult to adapt radiation for poor responders. The purpose of this study was to investigate the prognostic value of delta radiomic features from MR-Linac for GBM. MATERIALS/METHODS Using an IRB-approved prospective cohort of GBM patients undergoing 30 fractions of chemoRT to 60 Gy on a 0.35T MR-Linac, 2 regions of interest (ROI) were contoured on daily T2-weighted treatment set-up scans: 1) tumor/edema (lesion) and 2) post-surgical resection cavity (RC). The lesion ROI were used to calculate texture features: second order radiomics features based on the gray-level co-occurrence matrix (GLCM), gray-level size zone matrix (GLSZM), gray-level run length matrix (GLRLM), and neighborhood gray-tone difference matrix (NGTDM). Each of these describe the probability of spatial relationships of gray levels occurring within the ROI. Features from fraction 1 (pre-radiation) were subtracted from fractions 5, 10, 15, 25, and 30 to create delta features at 5 timepoints (D5-D30). Patient response was retrospectively defined as no progression (NP), TP, or PP. Supervised machine learning was utilized using a 500-tree random forest (RF) classification model with TP or PP as the outcome. Variable importance analysis was conducted by calculating the out-of-bag errors with multiple bootstrapped data sets. The most prognostic features were selected using the RF importance scores. RESULTS Thirty-six patients were screened for inclusion: 9 were excluded due to no T2 lesion (RC ROI only). Of the remaining 27 patients: 10 had NP, 11 had TP, and 6 had PP. Thirty-nine texture features, plus lesion volume and mean lesion intensity (for a total of 41 variables per time point) were calculated and included in the model. Of the 10 most prognostic features, 6 were from D10, suggesting that prognostic changes in the underlying lesion microenvironment are occurring within the first 10 fractions of treatment. The model selected GLSZM high gray-level zone emphasis (HGZE) D10, IBSI code 5GN9, as the most prognostic feature. The receiver operator characteristic (ROC) area under the curve (AUC) for GLSZM HGZE D10 was 0.94 (95% CI = 0.81-1.00). CONCLUSION Delta radiomic features extracted from MR-Linac imaging may predict between PP and TP in GBM patients during treatment, which is earlier than current methods. This could allow physicians to adapt/intensify treatment in real time for poorly responding patients. Future directions include analysis with a larger patient cohort and with additional MRI contrasts (MR-Linac multiparametric MRI).
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Affiliation(s)
- K Cullison
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL
| | - G Simpson
- Department of Radiation Oncology, University of Miami/Sylvester Comprehensive Cancer Center, Miami, FL
| | - A Valderrama
- Department of Radiation Oncology, University of Miami/Sylvester Comprehensive Cancer Center, Miami, FL
| | - D Maziero
- Department of Radiation Medicine and Applied Sciences, University of California San Diego, La Jolla, CA
| | | | - M De La Fuente
- Department of Neurology, University of Miami/Sylvester Comprehensive Cancer Center, Miami, FL
| | - J J Meshman
- Department of Radiation Oncology, University of Miami/ Sylvester Comprehensive Cancer Center, Miami, FL
| | - G Azzam
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL
| | - R Stoyanova
- Department of Radiation Oncology, University of Miami/Sylvester Comprehensive Cancer Center, Miami, FL
| | - J Ford
- Department of Radiation Oncology, University of Miami/Sylvester Comprehensive Cancer Center, Miami, FL
| | - E A Mellon
- Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL
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Xie J, Valderrama A, Yin L, Zhang S, Shih CS, Gu C, Bhagia P, Wainberg Z. 1390P Evaluation of event-free survival as a trial-level surrogate for overall survival for patients with gastric and gastroesophageal junction adenocarcinoma in neoadjuvant/adjuvant settings. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.1499] [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: 10/20/2022] Open
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Van Cutsem E, Valderrama A, Bang YJ, Fuchs CS, Shitara K, Janjigian YY, Qin S, Larson TG, Shankaran V, Stein S, Norquist JM, Kher U, Shah S, Alsina M. Quality of life with first-line pembrolizumab for PD-L1-positive advanced gastric/gastroesophageal junction adenocarcinoma: results from the randomised phase III KEYNOTE-062 study. ESMO Open 2021; 6:100189. [PMID: 34371381 PMCID: PMC8358416 DOI: 10.1016/j.esmoop.2021.100189] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 05/20/2021] [Accepted: 05/24/2021] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND In the randomised phase III KEYNOTE-062 study, pembrolizumab was non-inferior to chemotherapy for overall survival in patients with programmed death-ligand 1 (PD-L1)-positive [combined positive score (CPS) ≥1] advanced gastric/gastroesophageal junction (GEJ) cancer. We present findings of prespecified health-related quality-of-life (HRQOL) analyses for pembrolizumab versus chemotherapy in this population. MATERIALS AND METHODS HRQOL, a secondary endpoint, was measured in patients who received ≥1 dose of study treatment and completed ≥1 HRQOL questionnaire [European Organisation for the Research and Treatment of Cancer (EORTC) 30-question quality-of-life (QLQ-C30), EORTC 22-question quality-of-life gastric-cancer-specific module (QLQ-STO22)]. Least squares mean (LSM) change (baseline to week 18) in global health status/quality of life (GHS/QOL; EORTC QLQ-C30) and time to deterioration (TTD) in GHS/QOL, nausea/vomiting and appetite loss scores (EORTC QLQ-C30) and abdominal pain/discomfort scores (EORTC QLQ-STO22) were evaluated. RESULTS The HRQOL population comprised 495 patients with CPS ≥1 (pembrolizumab, 252; chemotherapy, 243). Compliance rates at week 18 were similar for pembrolizumab and chemotherapy (EORTC QLQ-C30, 87.9% and 81.9%; EORTC QLQ-STO22, 87.9% and 81.3%, respectively). There was no between-arm difference in LSM score change in GHS/QOL [-0.16; 95% confidence interval (CI) -5.01 to 4.69; P = 0.948]. The LSM score change for most subscales showed comparable worsening in both arms. TTD for GHS/QOL [hazard ratio (HR), 0.96; 95% CI, 0.67-1.38; P = 0.826], appetite loss (HR, 0.83; 95% CI, 0.58-1.20; P = 0.314) and pain (HR, 1.22; 95% CI, 0.78-1.91; P = 0.381) were similar between arms. Longer TTD was observed for pembrolizumab versus chemotherapy for nausea/vomiting (HR, 0.61; 95% CI, 0.44-0.85; P = 0.003). CONCLUSIONS HRQOL was maintained with first-line treatment with pembrolizumab in patients with PD-L1-positive advanced gastric/GEJ cancer and was similar between pembrolizumab and chemotherapy in this population.
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Affiliation(s)
- E Van Cutsem
- Department of Digestive Oncology, University Hospital Gasthuisberg Leuven and KU Leuven, Leuven, Belgium.
| | - A Valderrama
- Center for Observational and Real-World Evidence, Merck & Co., Inc., Kenilworth, USA
| | - Y-J Bang
- Department of Biomedical Research, Seoul National University College of Medicine, Seoul, South Korea
| | - C S Fuchs
- Department of Internal Medicine: Hematology, Medical Oncology, Gastro-oncology, Yale University Cancer Center, Smilow Cancer Hospital, New Haven, USA
| | - K Shitara
- Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, Kashiwa, Japan
| | - Y Y Janjigian
- Department of Gastrointestinal Oncology, Medicine, Memorial Sloan Kettering Cancer Center, New York, USA
| | - S Qin
- Cancer Center, PLA Cancer Centre of Nanjing Bayi Hospital, Nanjing, China
| | - T G Larson
- Department of Hematology/Oncology, Minnesota Oncology Hematology, Minneapolis
| | - V Shankaran
- Department of Medical Oncology, Seattle Cancer Care Alliance, Seattle
| | - S Stein
- Department of Internal Medicine: Hematology, Medical Oncology, Gastro-oncology, Yale University Cancer Center, Smilow Cancer Hospital, New Haven, USA
| | - J M Norquist
- Center for Observational and Real-World Evidence, Merck & Co., Inc., Kenilworth, USA
| | - U Kher
- Department of Medical Oncology, Merck & Co., Inc., Kenilworth, USA
| | - S Shah
- Department of Medical Oncology, Merck & Co., Inc., Kenilworth, USA
| | - M Alsina
- Department of Medical Oncology, Vall d'Hebron University Hospital and Institute of Oncology, Barcelona; University Autònoma de Barcelona, Barcelona, Spain
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Jahuira M, Pando A, Acosta J, Sanchez L, Valderrama A, Jacinto C, Maza I, Solis H, Mayta H. Modified chitosan microparticles to molecular diagnostic of Chagas disease. Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.492] [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: 11/16/2022] Open
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D'Aiuto C, Valderrama A, Boucoiran I. An epidemiological portrait of sexually transmitted and blood-borne infections (STBBIs) in pregnant women followed at Sainte-Justine hospital: identification of risk factors and associated perinatal vulnerabilities. Am J Obstet Gynecol 2019. [DOI: 10.1016/j.ajog.2019.10.050] [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: 11/29/2022]
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Van Cutsem E, Valderrama A, Bang YJ, Fuchs C, Shitara K, Janjigian Y, Qin S, Larson T, Shankaran V, Stein S, Norquist J, Kher U, Shah S, Alsina M. Health-related quality of life (HRQoL) impact of pembrolizumab (P) versus chemotherapy (C) as first-line (1L) treatment in PD-L1–positive advanced gastric or gastroesophageal junction (G/GEJ) adenocarcinoma. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz394.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Ahn D, Barzi A, Miksad R, Surinach A, Corvino F, Valderrama A, Mamlouk K, Pulgar S, Bekaii-Saab T. Real-world dosing patterns of patients (pts) with metastatic pancreatic cancer (mPC) treated with liposomal irinotecan (nal-IRI) in US oncology clinics. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy282.118] [Citation(s) in RCA: 1] [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: 11/14/2022] Open
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8
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Kusari A, Borok J, Han A, Valderrama A, Friedlander S. 358 Plantar distribution of hand-foot skin reaction related to use of a multikinase inhibitor and hard orthotic shoes in a pediatric patient. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.364] [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: 11/24/2022]
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Futami K, Valderrama A, Baldi M, Minakawa N, Marín Rodríguez R, Chaves LF. New and Common Haplotypes Shape Genetic Diversity in Asian Tiger Mosquito Populations from Costa Rica and Panamá. J Econ Entomol 2015; 108:761-768. [PMID: 26470188 DOI: 10.1093/jee/tou028] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Accepted: 10/22/2014] [Indexed: 06/05/2023]
Abstract
The Asian tiger mosquito, Aedes albopictus (Skuse) (Diptera: Culicidae), is a vector of several human pathogens. Ae. albopictus is also an invasive species that, over recent years, has expanded its range out of its native Asia. Ae. albopictus was suspected to be present in Central America since the 1990s, and its presence was confirmed by most Central American nations by 2010. Recently, this species has been regularly found, yet in low numbers, in limited areas of Panamá and Costa Rica (CR). Here, we report that short sequences (∼558 bp) of the mitochondrial cytochrome oxidase subunit 1 (COI) and NADH dehydrogenase subunit 5 genes of Ae. albopictus, had no haplotype diversity. Instead, there was a common haplotype for each gene in both CR and Panamá. In contrast, a long COI sequence (∼1,390 bp) revealed that haplotype diversity (±SD) was relatively high in CR (0.72±0.04) when compared with Panamá (0.33±0.13), below the global estimate for reported samples (0.89±0.01). The long COI sequence allowed us to identify seven (five new) haplotypes in CR and two (one new) in Panamá. A haplotype network for the long COI gene sequence showed that samples from CR and Panamá belong to a single large group. The long COI gene sequences suggest that haplotypes in Panamá and CR, although similar to each other, had a significant geographic differentiation (Kst=1.33; P<0.001). Thus, most of our results suggest a recent range expansion in CR and Panamá.
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Affiliation(s)
- K Futami
- Department of Vector Ecology and Environment, Institute of Tropical Medicine (NEKKEN), Nagasaki University, 852-8523, Sakamoto 1-12-4, Nagasaki, Japan
| | - A Valderrama
- Departamento de Entomología Médica, Instituto Conmemorativo Gorgas de Estudios de la Salud (ICGES), Ministerio de Salud, Ciudad de Panamá, República de Panamá
| | - M Baldi
- Programa de Investigación en Enfermedades Tropicales (PIET), Escuela de Medicina Veterinaria, Universidad Nacional, Heredia, Costa Rica
| | - N Minakawa
- Department of Vector Ecology and Environment, Institute of Tropical Medicine (NEKKEN), Nagasaki University, 852-8523, Sakamoto 1-12-4, Nagasaki, Japan
| | - R Marín Rodríguez
- Departamento de Control de Vectores, Ministerio de Salud, San José, Costa Rica
| | - L F Chaves
- Department of Vector Ecology and Environment, Institute of Tropical Medicine (NEKKEN), Nagasaki University, 852-8523, Sakamoto 1-12-4, Nagasaki, Japan. Programa de Investigación en Enfermedades Tropicales (PIET), Escuela de Medicina Veterinaria, Universidad Nacional, Heredia, Costa Rica. Corresponding author, e-mail:
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Danés I, Agustí A, Vallano A, Alerany C, Martínez J, Bosch JA, Ferrer A, Gratacós L, Pérez A, Olmo M, Marron SMC, Valderrama A, Bonafont X. Outcomes of off-label drug uses in hospitals: a multicentric prospective study. Eur J Clin Pharmacol 2014; 70:1385-93. [PMID: 25196202 PMCID: PMC4198805 DOI: 10.1007/s00228-014-1746-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 08/26/2014] [Indexed: 01/05/2023]
Abstract
PURPOSE The study aims to assess the clinical evidence, outcome and cost of off-label use of medicines in the hospital setting. METHODS A multicentric prospective cohort study of patients treated with off-label medicines was carried out in five tertiary hospitals from May 2011 to May 2012. Information on clinical characteristics of patients, drugs, outcomes and costs was collected. Patients were followed up to 6 months, and information was assessed by reviewing clinical records and interviewing physicians. RESULTS A total of 226 patients were included. The median (interquartile range (IQR)) age of patients was 46 (33-62) years; 59 % were women. Patients had received a median of three previous treatments, and a lack of response (or suboptimal) was the main reason for off-label use (72.1 %). A total of 232 off-label medicines were administered for 102 different indications. The most frequent medicines were rituximab (49; 21.1 %), botulinum toxin (25; 10.7 %) and omalizumab (14; 6.0 %). In 117 (51.8 %) cases, the level of clinical evidence for their use was low. A partial clinical response was observed in 82 patients (36.3 %), complete response in 71 (31.4 %) and stabilization in 11 (4.9 %). A total of 58 (26.5 %) patients had adverse effects, which in 11 (4.9 %) were severe. The median (IQR) cost per patient was 2,943.07 (541.9-5,872.54). CONCLUSIONS There was a high variability of off-label medicines and indications. Although the clinical evidence of off-label medicines was often low, clinical response was observed in many patients with previous multiple treatment failure, but at the expense of some adverse effects and a high cost. Registers of patients would be helpful for clinical decisions, although clinical trials are needed.
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Affiliation(s)
- I Danés
- Clinical Pharmacology Service, Fundació Institut Català de Farmacologia. Hospital Universitari Vall d'Hebron, Department of Pharmacology, Therapeutics and Toxicology, Universitat Autònoma de Barcelona, Passeig Vall d'Hebron, 119-129, Barcelona, Spain,
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Sussman M, Munsell M, Valderrama A, Seal BS, Wen L. Estimating the Economic Impact of Sorafenib in Treatment of Locally Recurrent or Metastatic, Progressive, Differentiated Thyroid Carcinoma (DTC) That is Refractory to Radioactive Iodine (RAI) Treatment. Value Health 2014; 17:A621. [PMID: 27202184 DOI: 10.1016/j.jval.2014.08.2200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- M Sussman
- Boston Health Economics, Inc., Waltham, MA, USA
| | - M Munsell
- Boston Health Economics, Inc., Waltham, MA, USA
| | - A Valderrama
- Bayer HealthCare Pharmaceuticals Inc., Whippany, NJ, USA
| | - B S Seal
- Bayer HealthCare Pharmaceuticals Inc., Whippany, NJ, USA
| | - L Wen
- Bayer HealthCare Pharmaceuticals Inc., Whippany, NJ, USA
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Donga P, Bilir P, Valderrama A, Li H, Munakata J. Health State Utilities Among Metastatic Castrate-Resistant Prostate Cancer Patients With and Without Symptomatic Skeletal Events. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2067] [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: 10/24/2022]
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Lopez MF, Tollervey J, Krastins B, Garces A, Sarracino D, Prakash A, Vogelsang M, Geesman G, Valderrama A, Jordan IK, Lunyak VV. Depletion of nuclear histone H2A variants is associated with chronic DNA damage signaling upon drug-evoked senescence of human somatic cells. Aging (Albany NY) 2013; 4:823-42. [PMID: 23235539 PMCID: PMC3560435 DOI: 10.18632/aging.100507] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Cellular senescence is associated with global chromatin changes, altered gene expression, and activation of chronic DNA damage signaling. These events ultimately lead to morphological and physiological transformations in primary cells. In this study, we show that chronic DNA damage signals caused by genotoxic stress impact the expression of histones H2A family members and lead to their depletion in the nuclei of senescent human fibroblasts. Our data reinforce the hypothesis that progressive chromatin destabilization may lead to the loss of epigenetic information and impaired cellular function associated with chronic DNA damage upon drug-evoked senescence. We propose that changes in the histone biosynthesis and chromatin assembly may directly contribute to cellular aging. In addition, we also outline the method that allows for quantitative and unbiased measurement of these changes.
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Affiliation(s)
- Mary F Lopez
- BRIMS, Thermo Fisher Scientific, Cambridge, MA, USA
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Elgueta M, Echevarría G, De la Fuente N, Cabrera F, Valderrama A, Cabezón R, Muñoz H, Cortinez L. Effect of intravenous fluid therapy on postoperative vomiting in children undergoing tonsillectomy. Br J Anaesth 2013; 110:607-14. [DOI: 10.1093/bja/aes453] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [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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Gilchrist S, Schieb L, Mukhtar Q, Valderrama A, Yoon P, Sasson C. A Summary of Public Access Defibrillation Laws, United States, 2010. Prev Chronic Dis 2012. [DOI: 10.5888/pcd9.110196] [Citation(s) in RCA: 2] [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: 11/10/2022] Open
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Tapia J, Vargas-Chacoff L, Bertrán C, Carrasco G, Torres F, Pinto R, Urzúa S, Valderrama A, Letelier L. Study of the content of cadmium, chromium and lead in bivalve molluscs of the Pacific Ocean (Maule Region, Chile). Food Chem 2010. [DOI: 10.1016/j.foodchem.2009.12.091] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Altamirano M, Gil J, Granados V, Morales G, Valderrama A, Montesinos H, Robles C, Calzada R, Garduño J, Altamirano N. Economic costs associated with type 1 diabetes. Can J Diabetes 2009. [DOI: 10.1016/s1499-2671(09)33305-5] [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: 11/16/2022]
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Kocken CHM, Withers-Martinez C, Dubbeld MA, van der Wel A, Hackett F, Valderrama A, Blackman MJ, Thomas AW. High-level expression of the malaria blood-stage vaccine candidate Plasmodium falciparum apical membrane antigen 1 and induction of antibodies that inhibit erythrocyte invasion. Infect Immun 2002; 70:4471-6. [PMID: 12117958 PMCID: PMC128198 DOI: 10.1128/iai.70.8.4471-4476.2002] [Citation(s) in RCA: 160] [Impact Index Per Article: 7.3] [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] Open
Abstract
Apical membrane antigen 1 (AMA-1) is a highly promising malaria blood-stage vaccine candidate that has induced protection in rodent and nonhuman primate models of malaria. Authentic conformation of the protein appears to be essential for the induction of parasite-inhibitory antibody responses. Here we have developed a synthetic gene with adapted codon usage to allow expression of Plasmodium falciparum FVO strain AMA-1 (PfAMA-1) in Pichia pastoris. In addition, potential N-glycosylation sites were changed, exploiting the lack of conservation of these sites in Plasmodium, to obtain high-level secretion of a homogeneous product, suitable for scale-up according to current good manufacturing procedures. Purified PfAMA-1 displayed authentic antigenic properties, indicating that the amino acid changes had no deleterious effect on the conformation of the protein. High-titer antibodies, raised in rabbits, reacted strongly with homologous and heterologous P. falciparum by immunofluorescence. In addition, purified immunoglobulin G from immunized animals strongly inhibited invasion of red blood cells by homologous and, to a somewhat lesser extent, heterologous P. falciparum.
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Affiliation(s)
- Clemens H M Kocken
- Department of Parasitology, Biomedical Primate Research Centre, 2280 GH Rijswijk, The Netherlands
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Aldana E, Lizano E, Rodríguez M, Valderrama A. [Feeding and defecation of Rhodnius (hemiptera: Reduviidae) fed human blood]. REV BIOL TROP 2001; 49:693-5. [PMID: 11935923] [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: 02/24/2023] Open
Abstract
Feeding and defecation behavior of Rhodnius prolixus Stal, 1859, R. robustus Larrousse, 1927, R. neivai Lent, 1953 and R. pictipes Stal, 1872, artificially fed on human blood, were studied under laboratory conditions. In all species, first instar nymphs did not defecate in the first 30 minutes after feeding. R. pictipes did not accept artificial feeding but fed directly on humans. Nymph and adult R. prolixus had a higher defecation index (DI) than other species; third instar nymphs had the highest DI = 1.62. In all instars, most individuals accepted the food in 3 Pounds minutes and finished feeding in less than 15 minutes.
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Affiliation(s)
- E Aldana
- Laboratorio de Entomología Herman Lent Dpto. Biología Fac. Ciencias, La Hechicera, Mérida, Venezuela.
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Aldana E, Lizano E, Valderrama A. [Effect of human blood feeding on the fecundity, fertility and biological cycle of Rhodnius prolixus (Hemiptera: Reduviidae)]. REV BIOL TROP 2001; 49:689-91. [PMID: 11935922] [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: 02/24/2023] Open
Abstract
The effect of several human blood fractions artificially fed to Rhodnius prolixus Stal 1859 on oviposture (fecundity), egg-hatching (fertility) and life cycle was observed. Specimens fed on man's blood were more fecund than those fed with woman's blood. There were no significant differences in fertility related to host sex. The nymphal development time and number of feedings to molt to the following instar were estimated. Animals fed only on blood plasm did not finish nymphal development, while those fed only blood red cells ended their life cycle in the third nymphal instar. Total life cycle lasts 129 days in individuals fed with whole blood.
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Affiliation(s)
- E Aldana
- Laboratorio de Entomología Herman Lent Dpto. Biología Fac. Ciencias, La Hechicera, Mérida, Venezuela.
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21
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Abstract
After changing feeding frequency to a weekly and biweekly basis, a statistical evaluation of the variation of some population and reproductive parameters was conducted. It was based on four cohorts experiments of Rhodnius neivai fed on hen or rabbit. We found a direct relationship between blood feeding frequency and the parameters adult average longevity, maximum longevity and life expectancy in the animals fed on hen. On the other hand, in the insect fed biweekly on rabbit, these three values were higher than the registered in the cohorts fed weekly. Reproductive output got bigger and age-specific fertility showed a small decrease when feeding frequency was weekly. Every population parameter, except generation time, was greater in the individuals fed weekly.
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Affiliation(s)
- D R Cabello
- Facultad de Ciencias, Departamento de Biología, Universidad de Los Andes, Mérida, Venezuela
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22
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Abstract
A statistical evaluation of the population dynamics of R. neivai is based on six cohorts experiments conducted under controlled laboratory conditions. Two blood sources were offered to animals: rabbit and hen. Egg hatching, nymphal development time and mortality, adult longevity and age-specific mortality, female age-specific fecundity and fertility were determined. In addition, some population parameters were evaluated, such as: life expectancy, intrinsic rate of natural increase, net reproduction rate, finite rate of increase, reproductive value and stable age distribution. Life cycle was longer in the animals fed on rabbit, nymphal survival was slightly higher in the individuals fed on hen. Age of first reproduction was lower in the insects fed on hen, but reproductive output and total number of reproductive weeks were greater in the cohorts fed on rabbit. Intrinsic and finite rate of increase were greater in the animals fed on hen. Generation time was slightly greater in the cohorts fed on rabbit. Net reproduction rate was similar on both blood sources, although it was slightly bigger in the individuals fed on rabbit. Reproductive value in the insects fed on rabbit was twice as much as the registered in the animals fed on hen.
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Affiliation(s)
- D R Cabello
- Facultad de Ciencias, Departamento de Biología, Universidad de Los Andes, Mérida, Venezuela
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