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1.
J Bus Ethics ; 182(3): 597-617, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-35035004

RESUMO

Humanitarian social enterprises (HSEs) are facing mounting pressure to incorporate social innovation into their practice. This study thus identifies how HSEs leverage organizational capabilities toward developing social innovation. Specifically, it considers how resource scarcity and operating circumstances affect the capabilities used by HSEs for developing social innovation, using a longitudinal case study approach with qualitative data from 12 hunger-relief HSEs operating in the United States. Based on 59 interviews with 31 managers and directors and related documents, several propositions are posited. The findings suggest that resource availability (i.e., scarcity vs. abundance) leads some HSEs to focus on developing social innovation using their collaborative capabilities, while others leverage their absorptive capacity. Further, HSEs adjust their approach to developing social innovation based on whether they are operating in ordinary circumstances (i.e., before the COVID pandemic) or extraordinary ones (i.e., during the COVID pandemic). Interestingly, the findings suggest that the organizational capabilities used by HSEs are adjusted as these enterprises become more familiar with extraordinary operating circumstances. For example, at the onset of the COVID-19 pandemic, resource-scarce HSEs focused on parallel bricolage to develop social innovation. Subsequently, they focused on selective bricolage. The findings offer novel insights by relating the social innovation of social enterprises to crisis management. Supplementary Information: The online version contains supplementary material available at 10.1007/s10551-021-05014-9.

2.
Healthc Q ; 22(SP): 27-39, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32049613

RESUMO

Patients for Patient Safety Canada (PFPSC) member engagement has evolved from individual stories to having 27 patients and family members actively participating in the National Patient Safety Consortium. PFPSC collaborated with 270 other stakeholders in governance, leadership and action teams to design, implement and evaluate the National Patient Safety Consortium and Integrated Patient Safety Action Plan. There were several key outputs, including a patient engagement guide. This article illustrates how patients were meaningfully engaged in a large-scale change initiative, highlighting the experiences of the patient partners and organizational partners in this transformational change.


Assuntos
Participação do Paciente/métodos , Segurança do Paciente , Qualidade da Assistência à Saúde , Canadá , Família , Humanos , Liderança , Erros Médicos/prevenção & controle , Desenvolvimento de Programas
3.
Healthc Q ; 22(SP): 82-95, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32049618

RESUMO

Senior healthcare leaders are the difference makers as key influencers in ushering in an organizational culture committed to patient safety. Although leaders at all levels are champions of transformation, leaders at the "top" have a unique opportunity - and a responsibility - to foster a culture that supports an organization on its journey to zero harm. Through a literature review of more than 60 resources and validation with thought leaders, national and provincial partners have developed a patient safety culture bundle for CEOs and senior healthcare leaders. The bundle is based on a set of evidence-based practices that must be applied collectively to establish and sustain a culture of quality and safety in order to deliver safe care.


Assuntos
Cultura Organizacional , Segurança do Paciente , Gestão da Segurança/organização & administração , Prática Clínica Baseada em Evidências , Humanos , Liderança , Erros Médicos/prevenção & controle
4.
J Immigr Minor Health ; 21(1): 66-72, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29388095

RESUMO

We examined health insurance coverage among U.S. and Mexican/Central American (M/CA) born labor workers living in the U.S. Using data from the 2010-2015 National Health Interview Survey, we employed logistic regression models to examine health insurance coverage and covariates among U.S. and M/CA born labor workers. Prevalence ratios between U.S. and M/CA born workers were also obtained. U.S. born workers had double the prevalence of insurance coverage. Regarding private insurance coverage, U.S. born workers had a higher prevalence of coverage compared to their M/CA born counterparts. Among foreign born workers with U.S. citizenship, the odds of having insurance coverage was greater than that of noncitizens. Additionally, those who had lived in the U.S. for 10 or more years had higher odds of having health insurance coverage. Disparities in health care coverage exist between U.S. born and foreign born labor workers.


Assuntos
Emigrantes e Imigrantes/estatística & dados numéricos , Hispânico ou Latino/estatística & dados numéricos , Cobertura do Seguro/estatística & dados numéricos , Seguro Saúde/estatística & dados numéricos , Adolescente , Adulto , América Central/etnologia , Feminino , Humanos , Modelos Logísticos , Masculino , Americanos Mexicanos/estatística & dados numéricos , Pessoa de Meia-Idade , Ocupações/estatística & dados numéricos , Fatores Socioeconômicos , Imigrantes Indocumentados/estatística & dados numéricos , Estados Unidos/epidemiologia , Adulto Jovem
5.
J Hosp Palliat Nurs ; 20(2): 129-136, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30063566

RESUMO

Integration of palliative care (PC) in oncology requires changes in delivery and processes of care, such as implementation of comprehensive, evidence-based interdisciplinary plans of care (IPOCs). A multidisciplinary design team partnered with an electronic health record company and an information analytics company that specializes in online clinical practice guidelines. The team sought to develop electronic IPOCs that address the unique needs of oncology inpatients, attend to PC needs, and reflect the interdisciplinary team's contribution to quality patient outcomes. Our cancer center had paper-based care plans that were not well integrated into workflow, did not represent comprehensive PC, did not reflect interdisciplinary care, and did not guide evidence-based practice at point of care. The team designed IPOCs to be incorporated into each discipline's workflow and unique documentation and established clinical decision support tools to suggest appropriate IPOCs. Thirty-five IPOCs were developed and included all domains of quality PC. Evaluation of IPOC use indicated incomplete, but improving, adoption of PC-specific IPOCs with engagement in collaborative care planning by a variety of disciplines and across oncology nursing subspecialties.


Assuntos
Registros Eletrônicos de Saúde/instrumentação , Serviço Hospitalar de Oncologia/tendências , Cuidados Paliativos/normas , Planejamento de Assistência ao Paciente/tendências , Documentação/métodos , Documentação/normas , Humanos , Cuidados Paliativos/métodos , Sistemas Automatizados de Assistência Junto ao Leito/normas
6.
J Allergy Clin Immunol Pract ; 4(5): 948-955.e15, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27329469

RESUMO

BACKGROUND: Hereditary angioedema (HAE) is a genetic disorder clinically characterized by recurrent attacks of subcutaneous and mucosal swelling. 17-α-Alkylated androgens (AA) have been used prophylactically to reduce HAE severity, but there are many questions about the efficacy and tolerability of AA. OBJECTIVE: The objective of this study was to investigate the tolerability and effectiveness of AA therapy in a large cohort of patients with HAE. METHODS: We performed a retrospective cross-sectional study on 650 subjects with HAE utilizing a one time, anonymous, web-based survey. Based on an initial questionnaire, patients were routed to one of the following questionnaires: currently using AA, previously used but discontinued AA, or never used AA. RESULTS: Statistical analysis revealed that androgens decreased attack frequency and severity in previous AA users (P < .0001) and current AA users (P < .0001). Substantial variability in the effectiveness was observed. Users who discontinued AA reported significantly lesser benefit. No dose effect was seen for the beneficial effect of AA; however, almost all users reported frequent side effects that were dose related and often severe. CONCLUSIONS: AA therapy is usually effective for the treatment of HAE although a substantial fraction of patients with HAE do not achieve adequate benefit. In contrast, the side effects of AA are seen in almost all subjects who take the medicines. If used, AA should only be recommended in the lowest effective and tolerated dose for carefully selected patients.


Assuntos
Androgênios/efeitos adversos , Androgênios/uso terapêutico , Angioedemas Hereditários/tratamento farmacológico , Adulto , Relação Dose-Resposta a Droga , Feminino , Humanos , Masculino , Autorrelato , Inquéritos e Questionários , Resultado do Tratamento
7.
Hum Genet ; 135(8): 869-80, 2016 08.
Artigo em Inglês | MEDLINE | ID: mdl-27193597

RESUMO

Relative to European Americans, type 2 diabetes (T2D) is more prevalent in African Americans (AAs). Genetic variation may modulate transcript abundance in insulin-responsive tissues and contribute to risk; yet, published studies identifying expression quantitative trait loci (eQTLs) in African ancestry populations are restricted to blood cells. This study aims to develop a map of genetically regulated transcripts expressed in tissues important for glucose homeostasis in AAs, critical for identifying the genetic etiology of T2D and related traits. Quantitative measures of adipose and muscle gene expression, and genotypic data were integrated in 260 non-diabetic AAs to identify expression regulatory variants. Their roles in genetic susceptibility to T2D, and related metabolic phenotypes, were evaluated by mining GWAS datasets. eQTL analysis identified 1971 and 2078 cis-eGenes in adipose and muscle, respectively. Cis-eQTLs for 885 transcripts including top cis-eGenes CHURC1, USMG5, and ERAP2 were identified in both tissues. 62.1 % of top cis-eSNPs were within ±50 kb of transcription start sites and cis-eGenes were enriched for mitochondrial transcripts. Mining GWAS databases revealed association of cis-eSNPs for more than 50 genes with T2D (e.g. PIK3C2A, RBMS1, UFSP1), gluco-metabolic phenotypes (e.g. INPP5E, SNX17, ERAP2, FN3KRP), and obesity (e.g. POMC, CPEB4). Integration of GWAS meta-analysis data from AA cohorts revealed the most significant association for cis-eSNPs of ATP5SL and MCCC1 genes, with T2D and BMI, respectively. This study developed the first comprehensive map of adipose and muscle tissue eQTLs in AAs (publically accessible at https://mdsetaa.phs.wakehealth.edu ) and identified genetically regulated transcripts for delineating genetic causes of T2D, and related metabolic phenotypes.


Assuntos
Tecido Adiposo/metabolismo , Diabetes Mellitus Tipo 2/genética , Músculos/metabolismo , Obesidade/genética , Locos de Características Quantitativas/genética , Tecido Adiposo/patologia , Adolescente , Adulto , Negro ou Afro-Americano/genética , Mapeamento Cromossômico , Diabetes Mellitus Tipo 2/patologia , Feminino , Regulação da Expressão Gênica , Predisposição Genética para Doença , Estudo de Associação Genômica Ampla , Humanos , Masculino , Pessoa de Meia-Idade , Músculos/patologia , Obesidade/patologia
9.
Clin Pediatr (Phila) ; 55(10): 935-42, 2016 09.
Artigo em Inglês | MEDLINE | ID: mdl-26581355

RESUMO

Hereditary angioedema (HAE) typically presents in childhood. Large gaps remain in our understanding of the natural history of HAE during childhood. We examined age of onset, delay in diagnosis, androgen exposure, and their influence on ultimate disease severity in a large cohort of patients with HAE. Median age of first swelling was 11 years with a median age at diagnosis of 19 years. Earlier onset of symptoms correlated with longer delays in diagnosis (P < .001) and predicted a more severe disease course, including increased number of attacks per year (P = .0009) and hospital admissions (P = .009). Earlier age of onset also significantly correlated with increased perceived HAE severity (P = .0002), negative overall life impact (P < .0001), and use of anabolic androgen. Our observations highlight the importance of early HAE diagnosis and suggest the necessity of a disease management plan once the diagnosis has been made.


Assuntos
Angioedemas Hereditários/diagnóstico , Diagnóstico Tardio/estatística & dados numéricos , Adolescente , Adulto , Idade de Início , Criança , Pré-Escolar , Estudos de Coortes , Feminino , Humanos , Lactente , Masculino , Índice de Gravidade de Doença , Adulto Jovem
10.
Healthc Q ; 17 Spec No: 41-4, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25344615

RESUMO

Following a brief review of the history and context for patient and family member involvement in healthcare safety improvements, a variety of tools and mechanisms for patient engagement will be offered along with specific examples from Patients for Patient Safety Canada (a patient-led program of the Canadian Patient Safety Institute) to illustrate the impact of involving patients and family members in safety work. Barriers and facilitators to patient engagement in safety will also be examined.


Assuntos
Atenção à Saúde/normas , Segurança do Paciente/normas , Relações Profissional-Família , Relações Profissional-Paciente , Melhoria de Qualidade , Canadá , Humanos
11.
Pediatr Nurs ; 38(1): 31-5, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22474856

RESUMO

This study was conducted to validate the CHAMPS pediatric fall risk assessment tool for hospitalized children. At the time of this study, there was a lack of published evidence for a valid pediatric fall risk assessment tool for hospitalized children. Adult instruments were the only valid tools for fall risk assessment, and they were being used in populations where the validity had not been established. A prospective cohort study was conducted to analyze the sensitivity and specificity of the CHAMPS pediatric fall risk assessment tool. Analysis was conducted to further establish validity. The CHAMPS instrument had a sensitivity of 0.75 and a specificity of 0.79, with a relative risk of 3.5, excess risk of 200%, and an odds ratio of 10.8. This instrument can be categorized as moderate to strong in prediction of pediatric falls, while specificity was found to be slightly stronger than sensitivity.


Assuntos
Acidentes por Quedas/estatística & dados numéricos , Criança Hospitalizada , Adolescente , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Masculino , Estudos Prospectivos , Medição de Risco , Fatores de Risco , Sensibilidade e Especificidade
12.
Int Arch Allergy Immunol ; 157(4): 417-24, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22123229

RESUMO

BACKGROUND: C1 inhibitor (C1INH) has recently been approved in the USA for the treatment of acute attacks in hereditary angioedema (HAE) patients. The literature suggests that treatment with C1INH is most effective when administered early in an attack. Home infusion of C1INH allows for the earliest possible intervention since patients can initiate therapy at the first sign of symptoms. METHODS: We performed an observational, prospective study on 39 subjects with HAE utilizing two groups of patients: one receiving on-demand C1INH replacement therapy in a medical facility and the other self-managing on-demand C1INH replacement therapy in the home setting under the supervision of a treating physician. All subjects completed online questionnaires weekly for 8 weeks. RESULTS: There were statistically significant decreases in attack duration (p < 0.0001), pain medication use (p < 0.0001) and graded attack severity (p < 0.005) in the subjects who received C1INH in the home setting versus the clinic-based group. Attack frequency was similar between the groups. The home group experienced more frequent injection-related side effects; however, the clinic group noted more severe adverse events from C1INH. CONCLUSION: Physician-supervised self-managed C1INH replacement therapy is a safe and effective treatment for patients with HAE with potential benefits in diminishing attack duration and attack severity.


Assuntos
Angioedemas Hereditários/tratamento farmacológico , Proteína Inibidora do Complemento C1/administração & dosagem , Terapia de Reposição de Enzimas/efeitos adversos , Adulto , Proteína Inibidora do Complemento C1/efeitos adversos , Progressão da Doença , Estudos de Viabilidade , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Relações Médico-Paciente , Estudos Prospectivos , Autoadministração/efeitos adversos , Inquéritos e Questionários , Fatores de Tempo
13.
Nurs Stand ; 26(38): 29, 2012 May 23.
Artigo em Inglês | MEDLINE | ID: mdl-28072222

RESUMO

During my second year, I was placed on a busy medical ward. There were some long-stay patients on the ward, one of whom remained in a side room with the curtains shut and without television, radio or visitors. Her notes indicated a recent diagnosis of Alzheimer's disease.

14.
Am J Cardiol ; 99(12): 1714-7, 2007 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-17560880

RESUMO

We tested the hypothesis that, compared with placebo, simvastatin would reduce the progression of coronary artery calcium (CAC) and abdominal aortic calcium (AAC) levels in participants asymptomatic for vascular disease. Total CAC and AAC were measured with multidetector cardiac computed tomography. Inclusion criteria were a CAC score of >or=50 Agatston units, high-density lipoprotein (HDL) cholesterol levelor=2 other risk factors. Diabetes and history of vascular disease were exclusion criteria. Participants were randomized to receive 80 mg simvastatin (n=40) or matching placebo (n=40) for 12 months. Lipids were measured at 3-month intervals, and CAC and AAC measurements were repeated at 6 and 12 months. Total cholesterol, triglycerides, and LDL decreased significantly with simvastatin treatment (p<0.0001 for all comparisons, adjusted for baseline levels), whereas lipids remained unchanged for subjects randomized to receive placebo. Total CAC volume increased from baseline in both treatment groups. For subjects in the active treatment group, CAC volume increased by 9%, whereas in the placebo group, plaque volume increased by 5% (p=0.12 for treatment effect). AAC volume also increased in both treatment groups (p=0.15 for treatment effect). In conclusion, simvastatin treatment does not reduce progression of CAC or AAC compared with placebo.


Assuntos
Aorta Abdominal/efeitos dos fármacos , Calcinose/tratamento farmacológico , Vasos Coronários/efeitos dos fármacos , Inibidores de Hidroximetilglutaril-CoA Redutases/uso terapêutico , Sinvastatina/uso terapêutico , Adulto , Idoso , Aorta Abdominal/diagnóstico por imagem , Calcinose/diagnóstico por imagem , Feminino , Humanos , Inibidores de Hidroximetilglutaril-CoA Redutases/farmacologia , Masculino , Pessoa de Meia-Idade , Sinvastatina/farmacologia , Tomografia Computadorizada Espiral
15.
J Cell Biochem ; 89(4): 720-32, 2003 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-12858338

RESUMO

The intranuclear distribution of the transcription factor Oct-4, which is specifically expressed in totipotent mice stem and germ line cells, was studied in mouse oocytes using immunogold labeling/electron microscopy and immunofluorescence/confocal laser scanning microcopy. The localization of Oct-4 was studied in transcriptionally active (uni/bilaminar follicles) and inactive (antral follicles) oocytes. Additionally, the Oct-4 distribution was examined relative to that of the unphosphorylated form of RNA polymerase II (Pol II) and splicing factor (SC 35) in the intranuclear entities such as perichromatin fibrils (PFs), perichromatin granules (PGs), interchromatin granule clusters (IGCs), Cajal bodies (CBs), and nucleolus-like bodies (NLBs). It was shown that: (i) Oct-4 is localized in PFs, IGCs, and in the dense fibrillar component (DFC) of the nucleolus at the transcriptionally active stage of the oocyte nucleus; (ii) Oct-4 present in PFs and IGCs colocalizes with Pol II and SC 35 at the transcriptionally active stage; (iii) Oct-4 accumulates in NLBs, CBs, and PGs at the inert stage of the oocyte. The results confirm the previous suggestion that PFs represent the major nucleoplasmic structural domain involved in active pre-mRNA transcription/processing. The colocalization of Oct-4 with Pol II in both IGCs and PFs in active oocytes (uni/bilaminar follicles) suggests that Oct-4 is intimately associated with the Pol II holoenzyme before and during transcription. The colocalization of Oct-4, Pol II, and SC 35 with coilin-containing structures such as NLBs and CBs at the inert stage (antral follicles) suggests that the latter may represent storage sites for the transcription/splicing machinery during the decline of transcription.


Assuntos
Proteínas de Ligação a DNA/metabolismo , Proteínas Nucleares/metabolismo , Oócitos/metabolismo , RNA Polimerase II/metabolismo , Ribonucleoproteínas , Fatores de Transcrição/metabolismo , Transcrição Gênica/fisiologia , Animais , Núcleo Celular/metabolismo , DNA Polimerase II/metabolismo , DNA Polimerase II/ultraestrutura , Feminino , Imunofluorescência , Camundongos , Camundongos Endogâmicos BALB C , Microscopia Confocal , Microscopia Imunoeletrônica/métodos , Fator 3 de Transcrição de Octâmero , Oócitos/ultraestrutura , Folículo Ovariano/citologia , Folículo Ovariano/metabolismo , Splicing de RNA , Fatores de Processamento de Serina-Arginina , Fator de Transcrição Sp1/metabolismo
16.
J Clin Immunol ; 23(1): 62-72, 2003 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-12645861

RESUMO

A pilot vaccine study was conducted to test the safety and immunological efficacy of four monthly immunizations of an MHC class I peptide vaccine, the E75 HLA-A2 epitope from HER-2/neu, using flt3 ligand as a systemic vaccine adjuvant. Twenty HLA-A2-expressing subjects with advanced stage prostate cancer were randomly assigned to one of four immunization or treatment schedules: (a) Flt3 ligand (20 microg/kg per day) administered subcutaneously daily for 14 days on a 28-day cycle, monthly for four months; (b) flt3 ligand course as above with the E75 peptide vaccine administered on day 7 of each flt3 ligand cycle; (c) flt3 ligand course as above with the E75 peptide vaccine administered on day 14 of each flt3 ligand cycle; or (d) E75 peptide admixed with granulocyte-macrophage colony-stimulating factor and administered intradermally once every 28 days, as has previously been reported. The primary endpoints of the study were the determination of safety and immunological efficacy in generating E75-specific T cells as determined by peptide-specific interferon-gamma ELIspot. Adverse events included one grade 3 skin reaction and the development of grade 2 autoimmune hypothyroidism in two subjects with preexisting subclinical autoimmune hypothyroidism. Dendritic cells were markedly increased in the peripheral blood of subjects receiving flt3 ligand with each repetitive cycle, but augmentation of antigen-presenting cells within the dermis was not observed. Apart from a single subject, no significant peptide-specific T-cell responses were detected by ELIspot, whereas delayed-type hypersensitivity responses were detectable in control subjects and in subjects receiving peptide vaccine early in the course of flt3 ligand administration. The absence of robust peripheral immune responses in the current study may be attributable to the small numbers of subjects or differences in the subject population. In addition, the inability of fit3 ligand to augment the number of peripheral skin antigen-presenting cells may have contributed to the absence of robust peptide-specific immunity detectable in the peripheral blood of immunized subjects treated with flt3 ligand.


Assuntos
Adjuvantes Imunológicos/uso terapêutico , Antígeno HLA-A2 , Proteínas de Membrana/uso terapêutico , Peptídeos/uso terapêutico , Vacinas de Subunidades Antigênicas , Adenocarcinoma/tratamento farmacológico , Células Dendríticas/metabolismo , Antígeno HLA-A2/efeitos adversos , Humanos , Células de Langerhans/metabolismo , Masculino , Peptídeos/efeitos adversos , Neoplasias da Próstata/tratamento farmacológico , Vacinas de Subunidades Antigênicas/efeitos adversos
17.
Circulation ; 107(8): 1146-51, 2003 Mar 04.
Artigo em Inglês | MEDLINE | ID: mdl-12615793

RESUMO

BACKGROUND: Although atherosclerosis often leads to lumen narrowing and symptomatic cardiovascular disease, it is now recognized that arteries have the potential to compensate by enlarging in response to atherosclerosis. We tested the hypotheses that carotid arterial interadventitial (IA) and lumen diameters were related to wall thickness and that carotid arterial diameters of individuals with coronary artery disease (CAD) differed from those of CAD-free controls. METHODS AND RESULTS: We measured lumen diameter, IA diameter, and intima-media thickness (IMT) using B-mode ultrasound in the common and internal carotid arteries of 141 CAD case patients and 139 disease-free control subjects. Common carotid IA diameter was greater in CAD cases than controls after adjustment for age, height, and sex (P<0.01). Common carotid lumen diameter was marginally larger in individuals with greater IMT (P=0.06) but was not associated with case status. Conversely, mean internal carotid IA and lumen diameters were smaller in CAD cases than controls in both univariable and multivariable models (both P<0.001), and lumina were smaller in individuals with greater IMT. Despite these cross-sectional differences in carotid artery dimensions, we were unable to detect any statistically significant interactive effects of CAD case status on the association of IMT with arterial dimensions. CONCLUSIONS: Internal carotid artery lumen and IA diameters are both smaller in CAD cases than controls. The association of increased IMT with arterial dimensions varies in a manner that is segment-specific for the common and internal carotid arteries.


Assuntos
Artérias Carótidas/diagnóstico por imagem , Doença da Artéria Coronariana/diagnóstico por imagem , Fatores Etários , Artérias Carótidas/anatomia & histologia , Estudos de Casos e Controles , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Túnica Íntima/diagnóstico por imagem , Túnica Média/diagnóstico por imagem , Ultrassonografia
18.
J Clin Oncol ; 20(11): 2624-32, 2002 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-12039923

RESUMO

PURPOSE: The HER-2/neu protein is a nonmutated tumor antigen that is overexpressed in a variety of human malignancies, including breast and ovarian cancer. Many tumor antigens, such as MAGE and gp100, are self-proteins; therefore, effective vaccine strategies must circumvent tolerance. We hypothesized that immunizing patients with subdominant peptide epitopes derived from HER-2/neu, using an adjuvant known to recruit professional antigen-presenting cells, granulocyte-macrophage colony-stimulating factor, would result in the generation of T-cell immunity specific for the HER-2/neu protein. PATIENTS AND METHODS: Sixty-four patients with HER-2/neu-overexpressing breast, ovarian, or non-small-cell lung cancers were enrolled. Vaccines were composed of peptides derived from potential T-helper epitopes of the HER-2/neu protein admixed with granulocyte-macrophage colony-stimulating factor and administered intradermally. Peripheral-blood mononuclear cells were evaluated at baseline, before vaccination, and after vaccination for antigen-specific T-cell immunity. Immunologic response data are presented on the 38 subjects who completed six vaccinations. Toxicity data are presented on all 64 patients enrolled. RESULTS: Ninety-two percent of patients developed T-cell immunity to HER-2/neu peptides (stimulation index, 2.1 to 59) and 68% to a HER-2/neu protein domain (stimulation index range, 2 to 31). Epitope spreading was observed in 84% of patients and significantly correlated with the generation of a HER-2/neu protein-specific T-cell immunity (P =.03). At 1-year follow-up, immunity to the HER-2/neu protein persisted in 38% of patients. CONCLUSION: The majority of patients with HER-2/neu-overexpressing cancers can develop immunity to both HER-2/neu peptides and protein. In addition, the generation of protein-specific immunity, after peptide immunization, was associated with epitope spreading, reflecting the initiation of an endogenous immune response. Finally, immunity can persist after active immunizations have ended.


Assuntos
Neoplasias da Mama/terapia , Vacinas Anticâncer/uso terapêutico , Carcinoma Pulmonar de Células não Pequenas/terapia , Epitopos de Linfócito T/uso terapêutico , Neoplasias Pulmonares/terapia , Neoplasias Ovarianas/terapia , Receptor ErbB-2/imunologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Neoplasias da Mama/imunologia , Carcinoma Pulmonar de Células não Pequenas/imunologia , Epitopos de Linfócito T/imunologia , Feminino , Humanos , Imunidade Celular , Modelos Lineares , Modelos Logísticos , Neoplasias Pulmonares/imunologia , Pessoa de Meia-Idade , Análise Multivariada , Neoplasias Ovarianas/imunologia , Receptor ErbB-2/metabolismo
19.
Blood ; 99(8): 2845-50, 2002 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-11929774

RESUMO

Dendritic cells (DCs) are potent antigen-presenting cells and have shown promise to function as "natural" vaccine adjuvants. Currently, most cancer vaccine trials using DCs generate autologous DCs ex vivo for each patient. Systemic treatment with Flt3 ligand (FL) results in a marked increase of DCs in tissues such as spleen and lymph nodes in mice and in the peripheral blood and skin of humans. In light of these observations, we questioned whether FL could be used systemically as a vaccine adjuvant to stimulate DC mobilization in vivo, circumventing the need to generate DCs ex vivo. Ten patients with HER-2/neu-overexpressing cancer were enrolled in a phase 1 study to receive a HER-2/neu peptide-based vaccine targeting the intracellular domain of the HER-2/neu protein. All patients received 20 microg/kg FL per day subcutaneously for 14 days. Five patients received the HER-2/neu peptide-based vaccine alone on day 7 of the 14-day cycle, and 5 patients received the vaccine admixed with 150 microg granulocyte macrophage-colony-stimulating factor (GM-CSF) on day 7 of the FL cycle. T-cell proliferative responses to HER-2/neu peptides and intracellular domain protein suggest that vaccine regimens including FL as an adjuvant were not effective in eliciting a significant HER-2/neu protein-specific T-cell proliferative response. However, including FL as a vaccine adjuvant was effective in boosting the precursor frequency of interferon-gamma-secreting HER-2/neu-specific T cells. The small sample size of each group, however, did not allow a statistically significant comparison of immune responses between the FL alone and FL with GM-CSF arms. Finally, vaccine regimens including FL as a vaccine adjuvant were associated with the development of apparent autoimmune phenomena in some patients.


Assuntos
Adjuvantes Imunológicos/administração & dosagem , Vacinas Anticâncer/farmacologia , Proteínas de Membrana/administração & dosagem , Receptor ErbB-2/administração & dosagem , Adjuvantes Imunológicos/farmacologia , Adjuvantes Imunológicos/uso terapêutico , Adulto , Idoso , Protocolos de Quimioterapia Combinada Antineoplásica/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/imunologia , Protocolos de Quimioterapia Combinada Antineoplásica/farmacologia , Doenças Autoimunes/induzido quimicamente , Neoplasias da Mama/complicações , Neoplasias da Mama/metabolismo , Neoplasias da Mama/terapia , Vacinas Anticâncer/administração & dosagem , Células Dendríticas/citologia , Células Dendríticas/efeitos dos fármacos , Feminino , Fator Estimulador de Colônias de Granulócitos e Macrófagos/administração & dosagem , Fator Estimulador de Colônias de Granulócitos e Macrófagos/farmacologia , Humanos , Interferon gama/metabolismo , Ativação Linfocitária/efeitos dos fármacos , Proteínas de Membrana/imunologia , Proteínas de Membrana/farmacologia , Pessoa de Meia-Idade , Neoplasias Ovarianas/complicações , Neoplasias Ovarianas/metabolismo , Neoplasias Ovarianas/terapia , Fragmentos de Peptídeos/administração & dosagem , Fragmentos de Peptídeos/imunologia , Fragmentos de Peptídeos/farmacologia , Receptor ErbB-2/imunologia , Receptor ErbB-2/metabolismo , Linfócitos T/efeitos dos fármacos , Linfócitos T/imunologia , Linfócitos T/metabolismo
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