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1.
Pediatr Blood Cancer ; 71(2): e30785, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38018337

RESUMO

BACKGROUND: There remains limited knowledge about the immune response to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccination in pediatric oncology patients, which is essential to provide counseling and risk adaptation in this vulnerable population. The goal of this study was to understand immunogenicity after vaccination in pediatric oncology patients, and determine if certain clinical factors impacted response. METHODS: Patients 0-25 years of age with a diagnosis of cancer and actively receiving therapy were enrolled on study. We excluded patients who were completely vaccinated prior to their cancer diagnosis. Blood samples were collected pre-vaccination, as well as 2, 4-6, and 8-12 weeks after vaccination. Healthy children who were fully vaccinated enrolled as controls. Clinical data and complete blood counts around time of vaccination were collected. To study B- and T-cell immunity, we measured neutralizing antibodies by enzyme-linked immunoassay and interferon gamma secretion by enzyme-linked immunospot, respectively. RESULTS: Twenty-six patients enrolled on study, for which 11 were evaluable oncology patients and seven were healthy controls. Adequate B-cell response was seen in 36.4% of patients, and adequate T-cell response in 77.8% of patients. Numbers were too small to detect differences based on malignancy type. There was no differences in immunity based on absolute lymphocyte count (ALC) or intensity of therapy. CONCLUSION: Pediatric oncology patients have a suboptimal immune response to SARS-CoV-2 vaccination. Booster doses will be imperative to provide optimal protection against COVID-19; however, blood counts may not be a useful guide to optimize the time of administration.


Assuntos
COVID-19 , Neoplasias , Criança , Humanos , Vacinas contra COVID-19 , SARS-CoV-2 , COVID-19/prevenção & controle , Oncologia , Anticorpos Neutralizantes , Neoplasias/terapia , Vacinação , Anticorpos Antivirais
2.
Pediatr Blood Cancer ; 71(7): e31039, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38689540

RESUMO

BACKGROUND: Opsoclonus-myoclonus-ataxia syndrome (OMAS) is a rare autoimmune disorder of the nervous system presenting with abnormal eye and limb movements, altered gait, and increased irritability. Two to four percent of children diagnosed with neuroblastoma have neuroblastoma-associated OMAS (NA-OMAS). These children typically present with non-high-risk neuroblastoma that is cured with surgery, with or without chemotherapy. Despite excellent overall survival, patients with NA-OMAS can have significant persistent neurological and developmental issues. OBJECTIVE: This study aimed to describe long-term neurocognitive and adaptive functioning of patients with NA-OMAS treated with multimodal therapy, including intravenous immunoglobulin (IVIG) on Children's Oncology Group (COG) protocol ANBL00P3. METHODS: Of 53 children enrolled on ANBL00P3, 25 submitted evaluable neurocognitive data at diagnosis and at least one additional time point within 2 years and were included in the analyses. Adaptive development was assessed via the Vineland Adaptive Behavior Scale, and validated, age-appropriate measures of intellectual function were also administered. RESULTS: Twenty-one of the 25 patients in this cohort ultimately received IVIG. Descriptive spaghetti plots suggest that this cohort demonstrated stable long-term cognitive functioning and adaptive development over time. This cohort also demonstrated decreased OMAS scores over time consistent with improved OMAS symptoms. CONCLUSIONS: While statistical significance is limited by small sample size and loss to follow-up over 10 years, findings suggest stable long-term cognitive and adaptive functioning over time in this treated cohort.


Assuntos
Neuroblastoma , Síndrome de Opsoclonia-Mioclonia , Humanos , Síndrome de Opsoclonia-Mioclonia/terapia , Síndrome de Opsoclonia-Mioclonia/etiologia , Masculino , Feminino , Neuroblastoma/complicações , Neuroblastoma/terapia , Neuroblastoma/mortalidade , Pré-Escolar , Criança , Lactente , Imunoglobulinas Intravenosas/uso terapêutico , Seguimentos , Adolescente , Terapia Combinada , Prognóstico , Adaptação Psicológica , Cognição , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico
3.
Pediatr Blood Cancer ; 71(2): e30792, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38053237

RESUMO

BACKGROUND/OBJECTIVES: High-risk Hodgkin lymphoma (HRHL) in children is curable with combined modality therapy. The Association of Pediatric Hematology-Oncology of Central America (AHOPCA) is a consortium of cancer centers from Central America. In 2004, AHOPCA implemented a guideline with a short course of chemotherapy (mStanfordV), strict diagnostics, and radiation guidelines, aimed at reducing abandonment and improving outcomes. METHODS: Newly diagnosed children less than 18 years of age with high-risk HL (Ann Arbor stages: IIB, IIIB, IV) from AHOPCA centers were staged with chest radiography and ultrasound or computed tomography. Therapy was a modified Stanford V (mStanfordV), substituting cyclophosphamide for mechlorethamine and involved field radiation. RESULTS: Of 219 patients with HRHL, 181 patients were eligible and evaluable; 146 (81%) were boys, 22% being less than 6 years; 43 were stage IIB, 84 IIIB, and 54 IV. Thirty-one (17%) abandoned therapy, 28 (15%) progressed, 30 (17%) relapsed, and eight (4%) died of toxicity. Radiation guidelines were not followed. Five-year abandonment-sensitive event-free survival and overall survival (AS-EFS, AS-OS ± SE) for the cohort were 46% ± 4% and 56% ± 4%; 5-year AS-OS for stages IIB, IIIB, and IV was 76% ± 7%, 59% ± 7%, and 35% ± 7% (p = .0006). CONCLUSION: Despite instituting a short treatment guideline, it did not improve the abandonment rate (17%) and did not achieve the reported outcomes of Stanford V. The cyclophosphamide dose used to replace merchlorethamine was inadequate. Despite strict guidelines, the radiation therapy application was inaccurate. Weekly chemotherapy may have adversely affected abandonment of therapy by increasing the burden of travel time. Based on these results, AHOPCA established a new abandonment strategy and a new guideline.


Assuntos
Antineoplásicos , Doença de Hodgkin , Masculino , Criança , Humanos , Feminino , Doença de Hodgkin/tratamento farmacológico , Doença de Hodgkin/patologia , Vincristina , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Antineoplásicos/uso terapêutico , Ciclofosfamida , Resultado do Tratamento , Doxorrubicina
4.
Pediatr Res ; 90(2): 341-346, 2021 08.
Artigo em Inglês | MEDLINE | ID: mdl-33469189

RESUMO

BACKGROUND: Iron deficiency anemia (IDA)-induced reactive thrombocytosis can occur in children and adults. The underlying mechanism for this phenomenon is indeterminate. Traditional cytokines such as thrombopoietin (TPO), interleukin-6 (IL-6), and IL-11 involved in megakaryopoiesis have not been shown to be the cause. Recent studies suggest that growth factors and signaling molecules involved with angiogenesis influence the proliferation and differentiation of megakaryocytes. METHODS: We investigated the possible association between angiogenic cytokines with reactive thrombocytosis due to IDA in an iron-deficient (ID) rat model. Complete blood count, iron panels, and TPO levels were measured at baseline and 5 weeks later in both control (C) and ID rats. Angiogenic cytokines were evaluated in the bone marrow in all rats. RESULTS: We successfully induced IDA in our rats by phlebotomy and reduced iron diet. We did not find an increase of TPO in ID rats. A review of the bone marrow showed an increase in the number of megakaryocytes, vascular structures, as well as increased intensity of stain for vascular endothelial growth factor (VEGF), and CXC chemokine receptor 4 (CXCR4) in rats with IDA compared to controls. CONCLUSIONS: Our results of histological bone marrow data suggest an important role for angiogenesis in the development of IDA-induced thrombocytosis. IMPACT: Thrombocytosis is common with IDA in both children and adults, but the mechanism is unclear. We confirmed that TPO is not the major driver of iron deficiency-associated thrombocytosis. We confirmed the increase in the number of megakaryocytes in the bone marrow despite stable TPO levels. We provided evidence supporting an important role of angiogenesis in megakaryocytopoiesis/thrombopoiesis with increased vascular structures and angiogenic cytokines in the bone marrow of iron-deficient rats. The demonstration that angiogenesis may play an important role in secondary thrombocytosis could lead to a new approach in treating symptomatic reactive thrombocytosis by targeting angiogenesis.


Assuntos
Anemia Ferropriva/complicações , Medula Óssea/irrigação sanguínea , Megacariócitos/metabolismo , Neovascularização Patológica , Receptores CXCR4/metabolismo , Trombocitose/etiologia , Trombopoese , Fator A de Crescimento do Endotélio Vascular/metabolismo , Anemia Ferropriva/sangue , Anemia Ferropriva/patologia , Animais , Modelos Animais de Doenças , Masculino , Megacariócitos/patologia , Ratos Sprague-Dawley , Transdução de Sinais , Trombocitose/sangue , Trombocitose/patologia , Trombopoetina/metabolismo
5.
Pediatr Blood Cancer ; 67(9): e28361, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32672879

RESUMO

Waldeyer's ring (WR) involvement in pediatric Hodgkin lymphoma (HL) is extremely rare and criteria for determining involvement and response to treatment are unclear. The international Staging, Evaluation, and Response Criteria Harmonization for Childhood, Adolescent and Young Adult Hodgkin Lymphoma (SEARCH for CAYAHL) Group performed a systematic review of the literature in search of involvement or response criteria, or evidence to support specific criteria. Only 166 cases of HL with WR involvement were reported in the literature, 7 of which were pediatric. To date no standardized diagnostic or response assessment criteria are available. Given the paucity of evidence, using a modified Delphi survey technique, expert consensus statements were developed by the SEARCH group to allow for a more consistent definition of disease and response evaluation related to this rare site of involvement among pediatric oncologists. The available evidence and expert consensus statements are summarized.


Assuntos
Doença de Hodgkin/patologia , Orofaringe/diagnóstico por imagem , Orofaringe/patologia , Tonsila Faríngea/patologia , Prova Pericial , Fluordesoxiglucose F18 , Doença de Hodgkin/diagnóstico por imagem , Humanos , Palato Mole/patologia , Tonsila Palatina/patologia , Tomografia por Emissão de Pósitrons , Língua/patologia
6.
BMC Pregnancy Childbirth ; 20(1): 352, 2020 Jun 09.
Artigo em Inglês | MEDLINE | ID: mdl-32517670

RESUMO

BACKGROUND: Group B Streptococcus (GBS) is the leading cause of invasive neonatal infection. In this study, we aimed to evaluate the analytical validation of qualitative real-time polymerase chain reaction (qPCR) as a means to detect GBS. METHODS: Genomic DNA (gDNA) was purified from 12 ATCC bacterial strains, two belonging to GBS and the remainder acting as negative controls. Additionally, gDNA was isolated from 21 strains of GBS from various serotypes (Ia, Ib and II-VIII). All gDNA was used to evaluate the analytical validation of the qPCR method employing a specific Taqman probe. Inclusivity, exclusivity, anticipated reportable range, the limit of detection and robustness were evaluated. The methods used are described in international guidelines and other existing reports. The performance of this qPCR method for detecting GBS was compared to other microbiological methods used with vaginal-rectal samples from pregnant women. RESULTS: Our qPCR method for detecting GBS was analytically validated. It has a limit of detection of 0.7 GE/µL and 100% analytical specificity. It detects all strains of GBS with the same level of performance as microbiological methods. CONCLUSION: Data suggest that this qPCR method performs adequately as a means to detect GBS in vaginal-rectal swabs from pregnant women.


Assuntos
Complicações Infecciosas na Gravidez/microbiologia , Reação em Cadeia da Polimerase em Tempo Real/métodos , Infecções Estreptocócicas/microbiologia , Streptococcus agalactiae/isolamento & purificação , DNA Bacteriano/isolamento & purificação , Feminino , Humanos , Gravidez , Reto/microbiologia , Sensibilidade e Especificidade , Streptococcus agalactiae/genética , Vagina/microbiologia
9.
Molecules ; 23(7)2018 Jul 19.
Artigo em Inglês | MEDLINE | ID: mdl-30029513

RESUMO

A rapid emergence of resistant bacteria is occurring worldwide, endangering the efficacy of antibiotics and reducing the therapeutic arsenal available for treatment of infectious diseases. In the present study, we developed a new class of compounds with antibacterial activity obtained by a simple, two step synthesis and screened the products for in vitro antibacterial activity against ATCC® strains using the broth microdilution method. The compounds exhibited minimum inhibitory concentrations (MIC) of 1⁻32 µg/mL against Gram-positive ATCC® strains. The structure⁻activity relationship indicated that the thiophenol ring is essential for antibacterial activity and the substituents on the thiophenol ring module, for antibacterial activity. The most promising compounds detected by screening were tested against methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus faecium (VREF) clinical isolates. We found remarkable activity against VREF for compounds 7 and 16, were the MIC50/90 were 2/4 µg/mL and 4/4 µg/mL, respectively, while for vancomycin the MIC50/90 was 256/512 µg/mL. Neither compound affected cell viability in any of the mammalian cell lines at any of the concentrations tested. These in vitro data show that compounds 7 and 16 have an interesting potential to be developed as new antibacterial drugs against infections caused by VREF.


Assuntos
Antibacterianos/química , Antibacterianos/farmacologia , Farmacorresistência Bacteriana Múltipla/efeitos dos fármacos , Enterococcus faecium/efeitos dos fármacos , Staphylococcus aureus/efeitos dos fármacos , Antibacterianos/síntese química , Fenômenos Químicos , Humanos , Testes de Sensibilidade Microbiana , Modelos Moleculares , Estrutura Molecular , Relação Estrutura-Atividade , Difração de Raios X
10.
Pediatr Blood Cancer ; 64(12)2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28612375

RESUMO

PURPOSE: We evaluated the outcome of children (<15 years) versus that of adolescents and young adults (AYA; 15-≤ 21 years) treated for Hodgkin lymphoma (HL) in two Pediatric Oncology Group/Children's Oncology Group clinical trials, P9425 and P9426, that used dose-dense, response-based chemotherapy and reduced dose radiotherapy. PATIENTS AND METHODS: Subjects 21 years or younger with HL were eligible for these studies. Subjects with low-risk (stages IA, IIA, and IIIA1) without large mediastinal adenopathy biopsy-proven HL, eligible for P9426, were treated with two to four 28-day cycles of doxorubicin, bleomycin, vincristine, and etoposide (ABVE) chemotherapy and 25.5 Gy of involved field radiotherapy. Subjects with intermediate-risk (stages IB, IIA, IIIA1 with large mediastinal adenopathy, and IIIA2) and high-risk (stages IIB, IIIB, and IV) biopsy-proven HL, eligible for P9425, were treated with three to five 21-day cycles of ABVE plus prednisone and cyclophosphamide (ABVE-PC) chemotherapy and 21 Gy of involved region radiotherapy. We compared the 5-year event-free survival (EFS), based on Kaplan-Meier product-limit method, of children versus that of AYA. RESULTS: Four hundred seventy-one subjects were enrolled on P9425 and P9426 combined. Of these subjects, 203 were AYA, 104 with intermediate and high-risk HL, and 99 with low-risk HL. The 5-year EFS of children did not significantly differ from that of AYA (85.9 vs. 87.1%) with a median follow up of 7.7 years (P = 0.51). CONCLUSION: Given the equivalent and excellent results of therapy, HL represents an opportunity for adult and pediatric cancer treatment collaborative groups to jointly design clinical trials targeted to AYA. These trials should focus on both treatment efficacy and the quality of life of AYA while receiving chemotherapy and in reduction of long-term side effects in the survivorship years.


Assuntos
Doença de Hodgkin/tratamento farmacológico , Adolescente , Criança , Protocolos Clínicos , Feminino , Doença de Hodgkin/mortalidade , Humanos , Masculino , Adulto Jovem
11.
Pediatr Blood Cancer ; 64(4)2017 04.
Artigo em Inglês | MEDLINE | ID: mdl-27786406

RESUMO

BACKGROUND: Early response to initial chemotherapy in Hodgkin lymphoma (HL) measured by computed tomography (CT) and/or positron emission tomography (PET) after two to three cycles of chemotherapy may inform therapeutic decisions. Risk stratification at diagnosis could, however, allow earlier and potentially more efficacious treatment modifications. PATIENTS AND METHODS: We developed a predictive model for event-free survival (EFS) in pediatric/adolescent HL using clinical data known at diagnosis from 1103 intermediate-risk HL patients treated on Children's Oncology Group protocol AHOD0031 with doxorubicin, bleomycin, vincristine, etoposide, prednisone, cyclophosphamide (ABVE-PC) chemotherapy and radiation. Independent predictors of EFS were identified and used to develop and validate a prognostic score (Childhood Hodgkin International Prognostic Score [CHIPS]). A training cohort was randomly selected to include approximately half of the overall cohort, with the remainder forming the validation cohort. RESULTS: Stage 4 disease, large mediastinal mass, albumin (<3.5), and fever were independent predictors of EFS that were each assigned one point in the CHIPS.  Four-year EFS was 93.1% for patients with CHIPS = 0, 88.5% for patients with CHIPS = 1, 77.6% for patients with CHIPS = 2, and 69.2% for patients with CHIPS = 3. CONCLUSIONS: CHIPS was highly predictive of EFS, identifying a subset (with CHIPS 2 or 3) that comprises 27% of intermediate-risk patients who have a 4-year EFS of <80% and who may benefit from early therapeutic augmentation.  Furthermore, CHIPS identified higher risk patients who were not identified by early PET or CT response. CHIPS is a robust and inexpensive approach to predicting risk in patients with intermediate-risk HL that may improve ability to tailor therapy to risk factors known at diagnosis.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Doença de Hodgkin/mortalidade , Adolescente , Adulto , Criança , Pré-Escolar , Feminino , Seguimentos , Doença de Hodgkin/tratamento farmacológico , Doença de Hodgkin/patologia , Humanos , Lactente , Recém-Nascido , Masculino , Estadiamento de Neoplasias , Prognóstico , Indução de Remissão , Taxa de Sobrevida , Adulto Jovem
12.
Pediatr Blood Cancer ; 64(7)2017 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-28097818

RESUMO

International harmonization of staging evaluation and response criteria is needed for childhood, adolescence, and young adulthood Hodgkin lymphoma. Two Hodgkin lymphoma protocols from cooperative trials in Europe and North America were compared for areas in need of harmonization, and an evidence-based approach is currently underway to harmonize staging and response evaluations with a goal to enhance comparisons, expedite identification of effective therapies, and aid in the approval process for new agents by regulatory agencies.


Assuntos
Doença de Hodgkin/patologia , Estadiamento de Neoplasias/métodos , Estadiamento de Neoplasias/normas , Adolescente , Criança , Feminino , Humanos , Masculino , Adulto Jovem
13.
Cancer ; 122(23): 3697-3704, 2016 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-27529658

RESUMO

BACKGROUND: Children of Hispanic ancestry have a higher incidence of acute lymphoblastic leukemia (ALL) compared with other ethnic groups, but to the authors' knowledge, the genetic basis for these racial disparities remain incompletely understood. Genome-wide association studies of childhood ALL to date have focused on inherited genetic effects; however, maternal genetic effects (the role of the maternal genotype on phenotype development in the offspring) also may play a role in ALL susceptibility. METHODS: The authors conducted a family-based exome-wide association study of maternal genetic effects among Hispanics with childhood B-cell ALL using the Illumina Infinium HumanExome BeadChip. A discovery cohort of 312 Guatemalan and Hispanic American families and an independent replication cohort of 152 Hispanic American families were used. RESULTS: Three maternal single-nucleotide polymorphisms (SNPs) approached the study threshold for significance after correction for multiple testing (P<1.0 × 10-6 ): MTL5 rs12365708 (testis expressed metallothionein-like protein [tesmin]) (relative risk [RR], 2.62; 95% confidence interval [95% CI], 1.61-4.27 [P = 1.8 × 10-5 ]); ALKBH1 rs6494 (AlkB homolog 1, histone H2A dioxygenase) (RR, 3.77; 95% CI, 1.84-7.74 [P = 3.7 × 10-5 ]); and NEUROG3 rs4536103 (neurogenin 3) (RR, 1.75; 95% CI, 1.30-2.37 [P = 1.2 × 10-4 ]). Although effect sizes were similar, these SNPs were not nominally significant in the replication cohort in the current study. In a meta-analysis comprised of the discovery cohort and the replication cohort, these SNPs were still not found to be statistically significant after correction for multiple comparisons (rs12365708: pooled RR, 2.27 [95% CI, 1.48-3.50], P = 1.99 × 10-4 ; rs6494: pooled RR, 2.31 [95% CI, 1.38-3.85], P = .001; and rs4536103: pooled RR, 1.67 [95% CI, 1.29-2.16] P = 9.23 × 10-5 ). CONCLUSIONS: In what to the authors' knowledge is the first family-based based exome-wide association study to investigate maternal genotype effects associated with childhood ALL, the results did not implicate a strong role of maternal genotype on disease risk among Hispanics; however, 3 maternal SNPs were identified that may play a modest role in susceptibility. Cancer 2016;122:3697-704. © 2016 American Cancer Society.


Assuntos
Linfócitos B/patologia , Exoma/genética , Predisposição Genética para Doença/genética , Hispânico ou Latino/genética , Polimorfismo de Nucleotídeo Único/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Adolescente , Adulto , Criança , Pré-Escolar , Feminino , Estudo de Associação Genômica Ampla/métodos , Genótipo , Humanos , Incidência , Lactente , Recém-Nascido , Masculino , Fenótipo , Adulto Jovem
15.
J Pediatr Gastroenterol Nutr ; 62(1): 22-35, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-26513620

RESUMO

Partially hydrolyzed formulas (pHFs) are increasingly used worldwide, both in the prevention of atopic disease in at-risk infants and in the therapeutic management of infants with functional gastrointestinal manifestations. Because prevention is always preferable to treatment, we reviewed the literature aiming to find an answer for the question whether pHF may be recommended for feeding all infants if breast-feeding is not possible. PubMed and Cochrane databases were searched up to December 2014. In addition, to search for data that remained undetected by the searches, we approached authors of relevant articles and major producers of pHFs asking for unpublished data. Because few data were found, nonrandomized, controlled trials and trials in preterm infants were included as well. Overall, only limited data could be found on the efficacy and safety of pHF in healthy term infants. Available data do not indicate that pHFs are potentially harmful for healthy, term infants. With respect to long-term outcomes, particularly referring to immune, metabolic and hormonal effects, data are, however, nonexistent. From a regulatory point of view, pHFs meet the nutrient requirements to be considered as standard formula for term healthy infants. Cost, which is different from country to country, should be considered in the decision-making process. Based on limited available data, the use of pHF in healthy infants is safe with regard to growth. The lack of data, in particular for metabolic consequences and long-term outcomes, is, however, the basis for our recommendation that health authorities should develop and support long-term follow-up studies. Efficacy and long-term safety data are required before a recommendation of this type of formula for all infants can be made.


Assuntos
Alimentação com Mamadeira/normas , Fórmulas Infantis/normas , Fenômenos Fisiológicos da Nutrição do Lactente/normas , Necessidades Nutricionais , Hidrolisados de Proteína/efeitos adversos , Alimentação com Mamadeira/métodos , Humanos , Lactente , Fórmulas Infantis/química , Fórmulas Infantis/economia , Fenômenos Fisiológicos da Nutrição do Lactente/efeitos dos fármacos , Recém-Nascido , Hidrolisados de Proteína/normas
16.
Rev Med Chil ; 144(7): 910-6, 2016 Jul.
Artigo em Espanhol | MEDLINE | ID: mdl-27661555

RESUMO

The gastrointestinal tract hosts around 10(14) bacterial microorganisms, in a constantly growing density from the stomach to the distal colon. This microbiota is composed by more than 500 species of bacteria, which are quickly acquired after birth, fairly stable during the host’s life, and essential for human homeostasis. These bacteria have important functions, such as stimulating the immune system, protecting the host from invading bacteria and viruses, and improving digestion, especially of complex carbohydrates. Also, the gut microbiota interacts directly with the immune system. However, the interaction of the intestinal epithelium and its microbiota with the immune system has yet to be fully understood. Secretory immunoglobulin A, produced by the plasma cells in Peyer’s patches and in the lamina propria, maintains non-invasive commensal bacteria and neutralize invasive pathogens. Dendritic cells migrate from the lamina propria of the secondary lymphoid organs to regulate gut immunity. They also have a key role maintaining luminal IgA and inducing the growth of regulatory T cells. Dendritic cells supervise the gut microenvironment too, keeping an immunological equilibrium and tolerance. The importance of the gut microbiota in regulating the immune system lies mostly in the homeostasis-or positive equilibrium. Thus, many diseases are a consequence of poor interactions or a loss of this equilibrium.


Assuntos
Microbioma Gastrointestinal/imunologia , Tolerância Imunológica/imunologia , Mucosa Intestinal/imunologia , Células Dendríticas/imunologia , Homeostase/imunologia , Humanos , Imunoglobulina A Secretora/imunologia , Probióticos , Linfócitos T Reguladores/imunologia
17.
Br J Haematol ; 170(1): 118-22, 2015 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-25833390

RESUMO

A Children's Oncology Group clinical trial aimed to determine if bortezomib (B) increased the efficacy of ifosfamide and vinorelbine (IV) in paediatric Hodgkin lymphoma (HL). This study enrolled 26 relapsed HL patients (<30 years) treated with two to four cycles of IVB. The primary endpoint was anatomic complete response (CR) after two cycles. Secondary endpoints included overall response (OR: CR + partial response) at study completion compared to historical controls [72%; 95% confidence interval (CI): 59-83%]. Although few patients achieved the primary objective, OR with IVB improved to 83% (95% CI: 61-95%; p = 0.32). Although not statistically different, results suggest IVB may be a promising combination.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Doença de Hodgkin/tratamento farmacológico , Adulto , Ácidos Borônicos/administração & dosagem , Bortezomib , Criança , Pré-Escolar , Intervalo Livre de Doença , Humanos , Ifosfamida/administração & dosagem , Recidiva Local de Neoplasia/tratamento farmacológico , Pirazinas/administração & dosagem , Vimblastina/administração & dosagem , Vimblastina/análogos & derivados , Vinorelbina , Adulto Jovem
18.
Pediatr Blood Cancer ; 62(1): 60-4, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25308760

RESUMO

BACKGROUND: We assessed the safety and efficacy of ifosfamide and vinorelbine (IV) as a less toxic and effective reinduction regimen for pediatric patients with relapsed or refractory Hodgkin Lymphoma. PROCEDURE: This multi-center Children's Oncology Group phase II pilot study enrolled patients <30 years of age with biopsy-proven Hodgkin Lymphoma in relapse or refractory disease after front-line therapy. Treatment consisted of ifosfamide 3,000 mg/m(2) intravenous infusion over 24 hr on Days 1-4 and vinorelbine 25 mg/m(2) /dose intravenous push on Days 1 and 5 of each 21 day cycle with cytokine support. The study endpoints included estimation of key toxicities (cardiac, hepatic, or renal toxicity or toxic death), the rate of successful peripheral stem cell harvesting, and response after two cycles of therapy. RESULTS: Sixty-six patients received a median of two cycles of IV. Sixty-four of 66 were heavily pretreated, 4 had refractory disease, 55% were male and 79% had nodular sclerosis HL. The primary toxicities were hematologic. Harvested peripheral stem cells were sufficient for autologous transplantation in 46 of 54 patients for whom stem cell collection was attempted. The overall response rate (72%; 95% CI 59-83%) permitted the majority of patients to undergo subsequent stem cell transplantation. CONCLUSIONS: IV is a safe and effective re-induction regimen for salvage of pediatric patients with relapsed or refractory Hodgkin Lymphoma with an excellent response rate and success of post chemotherapy stem cell harvest. It avoids the use of etoposide, an agent associated with secondary malignancy after stem cell transplantation.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Resistencia a Medicamentos Antineoplásicos , Doença de Hodgkin/terapia , Recidiva Local de Neoplasia/terapia , Transplante de Células-Tronco de Sangue Periférico , Terapia de Salvação , Adolescente , Adulto , Criança , Pré-Escolar , Terapia Combinada , Feminino , Seguimentos , Doença de Hodgkin/mortalidade , Doença de Hodgkin/patologia , Humanos , Ifosfamida/administração & dosagem , Lactente , Recém-Nascido , Masculino , Recidiva Local de Neoplasia/mortalidade , Recidiva Local de Neoplasia/patologia , Estadiamento de Neoplasias , Projetos Piloto , Prognóstico , Indução de Remissão , Taxa de Sobrevida , Transplante Autólogo , Vimblastina/administração & dosagem , Vimblastina/análogos & derivados , Vinorelbina , Adulto Jovem
19.
Rev Chilena Infectol ; 32(3): 350-6, 2015 Jun.
Artigo em Espanhol | MEDLINE | ID: mdl-26230445

RESUMO

Staphylococcus aureus is a known pathogen in pediatric patients that produces skin infections, cutaneous abscess, cellulitis and osteoarticular infections. Most of these infections are produced by a meticilin susceptible strain. The community associated methicillin resistant Staphylococcus aureus was published for the first time in 1993, ever since then is has been recognized as a cosmopolite pathogen. The first report in Latin America was published in 2003, and in Chile in 2008 from adult patients that have reported traveling to other countries. The following series describes four pediatric cases, all school-aged children, diagnosed since 2012 with clinical followups and molecular studies. Two cases presented as osteomyelitis of the lower extremity; and one presented as arm cellulitis. These three cases had Panton Valentine leukocidine (PV-L) negative strains from the clone complex 8. The last case presented a renal abscess, the strain was PV-L positive from the clone complex 30. This case series constitutes the first pediatric case report in Chile.


Assuntos
Staphylococcus aureus Resistente à Meticilina/isolamento & purificação , Infecções Estafilocócicas/microbiologia , Adolescente , Criança , Chile/epidemiologia , Infecções Comunitárias Adquiridas/epidemiologia , Infecções Comunitárias Adquiridas/microbiologia , Feminino , Hospitais Pediátricos , Humanos , Masculino , Infecções Estafilocócicas/epidemiologia
20.
Br J Nutr ; 111(8): 1340-60, 2014 Apr 28.
Artigo em Inglês | MEDLINE | ID: mdl-24507712

RESUMO

Soya-based infant formulas (SIF) containing soya flour were introduced almost 100 years ago. Modern soya formulas are used in allergy/intolerance to cows' milk-based formulas (CMF), post-infectious diarrhoea, lactose intolerance and galactosaemia, as a vegan human milk (HM) substitute, etc. The safety of SIF is still debated. In the present study, we reviewed the safety of SIF in relation to anthropometric growth, bone health (bone mineral content), immunity, cognition, and reproductive and endocrine functions. The present review includes cross-sectional, case-control, cohort studies or clinical trials that were carried out in children fed SIF compared with those fed other types of infant formulas and that measured safety. The databases that were searched included PubMed (1909 to July 2013), Embase (1988 to May 2013), LILACS (1990 to May 2011), ARTEMISA (13th edition, December 2012), Cochrane controlled trials register, Bandolier and DARE using the Cochrane methodology. Wherever possible, a meta-analysis was carried out. We found that the anthropometric patterns of children fed SIF were similar to those of children fed CMF or HM. Despite the high levels of phytates and aluminium in SIF, Hb, serum protein, Zn and Ca concentrations and bone mineral content were found to be similar to those of children fed CMF or HM. We also found the levels of genistein and daidzein to be higher in children fed SIF; however, we did not find strong evidence of a negative effect on reproductive and endocrine functions. Immune measurements and neurocognitive parameters were similar in all the feeding groups. In conclusion, modern SIF are evidence-based safety options to feed children requiring them. The patterns of growth, bone health and metabolic, reproductive, endocrine, immune and neurological functions are similar to those observed in children fed CMF or HM.


Assuntos
Dieta , Fórmulas Infantis/química , Alimentos de Soja/efeitos adversos , Proteínas Sanguíneas/metabolismo , Densidade Óssea/efeitos dos fármacos , Hemoglobinas/metabolismo , Humanos , Lactente , Oligoelementos/metabolismo
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