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1.
Harmful Algae ; 129: 102528, 2023 11.
Artigo em Inglês | MEDLINE | ID: mdl-37951613

RESUMO

A three-year field study at a mussel (Mytilus edulis) aquaculture site in Ship Harbour, Nova Scotia, Canada was carried out between 2004 and 2006 to detect toxic phytoplankton species and dissolved lipophilic phycotoxins and domoic acid. A combination of plankton monitoring and solid phase adsorption toxin tracking (SPATT) techniques were used. Net tow and pipe phytoplankton samples were taken weekly to determine the abundance of potentially toxic species and SPATT samplers were deployed weekly for phycotoxin analysis. Mussels were also collected for toxin analysis in 2005. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) was used to analyse the samples for spirolides (SPXs), pectenotoxins (PTXs), okadaic acid group toxins (OA, DTXs) and domoic acid (DA). Phycotoxins were detected with SPATT samplers beginning from the time of deployment until after the producing organisms were no longer observed in pipe samples. Seasonal changes in toxin composition occurred over the sampling period and were related to changes in cell concentrations of Alexandrium Halim, Dinophysis Ehrenberg and Pseudo-nitzschia (Hasle) Hasle. Spirolides peaked in late spring and early summer, followed by DA in mid-July. Okadaic acid, DTX1 and PTXs occurred throughout the field season but peaked in late summer. Concentrations of some phycotoxins detected in SPATT samplers deployed within the area where mussels were suspended on lines were lower than in those deployed outside the mussel farm. The SPATT samplers provided a useful tool to detect the presence of phycotoxins and to establish trends in their appearance in the Ship Harbour estuary.


Assuntos
Bivalves , Dinoflagellida , Animais , Fitoplâncton/metabolismo , Ácido Okadáico/análise , Estações do Ano , Toxinas Marinhas/análise , Cromatografia Líquida/métodos , Nova Escócia , Espectrometria de Massas em Tandem/métodos , Bivalves/química , Dinoflagellida/química , Aquicultura
2.
J Immunother Cancer ; 11(10)2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37907221

RESUMO

BACKGROUND: Preclinically, interleukin-15 (IL-15) monotherapy promotes antitumor immune responses, which are enhanced when IL-15 is used in combination with immune checkpoint inhibitors (ICIs). This first-in-human study investigated NIZ985, a recombinant heterodimer comprising physiologically active IL-15 and IL-15 receptor α, as monotherapy and in combination with spartalizumab, an anti-programmed cell death protein-1 (anti-PD-1) monoclonal antibody, in patients with advanced solid tumors. METHODS: This phase I/Ib study had two dose-escalation arms: single-agent NIZ985 administered subcutaneously thrice weekly (TIW, 2 weeks on/2 weeks off) or once weekly (QW, 3 weeks on/1 week off), and NIZ985 TIW or QW administered subcutaneously plus spartalizumab (400 mg intravenously every 4 weeks (Q4W)). The dose-expansion phase investigated NIZ985 1 µg/kg TIW/spartalizumab 400 mg Q4W in patients with anti-PD-1-sensitive or anti-PD-1-resistant tumor types stratified according to approved indications. The primary objectives were the safety, tolerability, and the maximum tolerated doses (MTDs) and/or recommended dose for expansion (RDE) of NIZ985 for the dose-expansion phase. RESULTS: As of February 17, 2020, 83 patients (median age: 63 years; range: 28-85) were treated in dose escalation (N=47; single-agent NIZ985: n=27; NIZ985/spartalizumab n=20) and dose expansion (N=36). No dose-limiting toxicities occurred nor was the MTD identified. The most common treatment-related adverse event (TRAE) was injection site reaction (primarily grades 1-2; single-agent NIZ985: 85% (23/27)); NIZ985/spartalizumab: 89% [50/56]). The most common grade 3-4 TRAE was decreased lymphocyte count (single-agent NIZ985: 7% [2/27]; NIZ985/spartalizumab: 5% [3/56]). The best overall response was stable disease in the single-agent arm (30% (8/27)) and partial response in the NIZ985/spartalizumab arm (5% [3/56]; melanoma, pancreatic cancer, gastric cancer). In dose expansion, the disease control rate was 45% (5/11) in the anti-PD-1-sensitive and 20% (5/25) in the anti-PD-1-resistant tumor type cohorts. Pharmacokinetic parameters were similar across arms. The transient increase in CD8+ T cell and natural killer cell proliferation and induction of several cytokines occurred in response to the single-agent and combination treatments. CONCLUSIONS: NIZ985 was well tolerated in the single-agent and NIZ985/spartalizumab regimens. The RDE was established at 1 µg/kg TIW. Antitumor activity of the combination was observed against tumor types known to have a poor response to ICIs. TRIAL REGISTRATION NUMBER: NCT02452268.


Assuntos
Antineoplásicos , Melanoma , Segunda Neoplasia Primária , Humanos , Pessoa de Meia-Idade , Anticorpos Monoclonais , Anticorpos Monoclonais Humanizados/uso terapêutico , Inibidores de Checkpoint Imunológico/uso terapêutico , Interleucina-15/uso terapêutico , Melanoma/tratamento farmacológico , Segunda Neoplasia Primária/tratamento farmacológico , Adulto , Idoso , Idoso de 80 Anos ou mais
5.
Clin Cancer Res ; 29(1): 110-121, 2023 01 04.
Artigo em Inglês | MEDLINE | ID: mdl-36282874

RESUMO

PURPOSE: The stimulator of IFN genes (STING) is a transmembrane protein that plays a role in the immune response to tumors. Single-agent STING agonist MIW815 (ADU-S100) has demonstrated immune activation but limited antitumor activity. This phase Ib, multicenter, dose-escalation study assessed the safety and tolerability of MIW815 plus spartalizumab (PDR001), a humanized IgG4 antibody against PD-1, in 106 patients with advanced solid tumors or lymphomas. PATIENTS AND METHODS: Patients were treated with weekly intratumoral injections of MIW815 (50-3,200 µg) on a 3-weeks-on/1-week-off schedule or once every 4 weeks, plus a fixed dose of spartalizumab (400 mg) intravenously every 4 weeks. RESULTS: Common adverse events were pyrexia (n = 23; 22%), injection site pain (n = 21; 20%), and diarrhea (n = 12; 11%). Overall response rate was 10.4%. The MTD was not reached. Pharmacodynamic biomarker analysis demonstrated on-target activity. CONCLUSIONS: The combination of MIW815 and spartalizumab was well tolerated in patients with advanced/metastatic cancers, including in patients with anti-PD-1 refractory disease. Minimal antitumor responses were seen.


Assuntos
Linfoma , Segunda Neoplasia Primária , Neoplasias , Humanos , Inibidores de Checkpoint Imunológico/uso terapêutico , Neoplasias/patologia , Linfoma/tratamento farmacológico , Segunda Neoplasia Primária/tratamento farmacológico
6.
Clin Cancer Res ; 28(4): 677-688, 2022 02 15.
Artigo em Inglês | MEDLINE | ID: mdl-34716197

RESUMO

PURPOSE: This phase I study assessed the safety, pharmacokinetics (PKs), and efficacy of MIW815 (ADU-S100), a novel synthetic cyclic dinucleotide that activates the stimulator of IFN genes (STING) pathway, in patients with advanced/metastatic cancers. PATIENTS AND METHODS: Patients (n = 47) received weekly i.t. injections of MIW815, 50 to 6,400 µg, on a 3-weeks-on/1-week-off schedule. RESULTS: A maximum tolerated dose was not reached. Most common treatment-related adverse events were pyrexia (17%), chills, and injection-site pain (each 15%). MIW815 was rapidly absorbed from the injection site with dose-proportional PK, a rapid terminal plasma half-life (approximately 24 minutes), and high interindividual variability. One patient had a partial response (PR; Merkel cell carcinoma); two patients had unconfirmed PR (parotid cancer, myxofibrosarcoma). Lesion size was stable or decreased in 94% of evaluable, injected lesions. RNA expression and immune infiltration assessments in paired tumor biopsies did not reveal significant on-treatment changes. However, increases in inflammatory cytokines and peripheral blood T-cell clonal expansion suggested systemic immune activation. CONCLUSIONS: MIW815 was well tolerated in patients with advanced/metastatic cancers. Clinical activity of single-agent MIW815 was limited in this first-in-human study; however, evidence of systemic immune activation was seen.


Assuntos
Linfoma , Segunda Neoplasia Primária , Neoplasias , Adulto , Humanos , Imunoterapia , Dose Máxima Tolerável , Neoplasias/tratamento farmacológico , Neoplasias/patologia
7.
Harmful Algae ; 102: 101852, 2021 02.
Artigo em Inglês | MEDLINE | ID: mdl-33875179

RESUMO

Spatial and temporal trends of marine harmful algal events in Canada over the last three decades were examined using data from the Harmful Algal Event Database (HAEDAT). This database contains the most complete record of algal blooms, phycotoxins and shellfish harvesting area closures in Canada since 1987. This 30-year review of 593 Canadian HAEDAT records from 1988 to 2017, together with other Canadian data and publications, shows that recurring harmful algal events have been widespread throughout both the Atlantic and Pacific coastal regions. The 367 paralytic shellfish toxin (PST) reports revealed annual and frequent recurrence throughout both the Atlantic and Pacific regions, including multi-year PST events in the Bay of Fundy, the Estuary and Gulf of St. Lawrence and the Strait of Georgia. The 70 amnesic shellfish toxin (AST) records revealed no recognizable trend, as these events were usually area specific and did not recur annually. The increasing frequency of diarrhetic shellfish toxin (DST) events over the period of this review, in total 59 records, can be at least partially explained by increased sampling effort. Marine species mortalities caused by harmful algae (including diatoms, dictyochophytes, dinoflagellates, and raphidophytes), were a common occurrence in the Pacific region (87 reports), but have been reported much less frequently in the Atlantic region (10 reports). Notable Canadian records contained in HAEDAT include the first detection worldwide of amnesic shellfish poisoning (ASP), attributed to the production of domoic acid (an AST) by a diatom (Pseudo-nitzschia multiseries) in Prince Edward Island in 1987. The first proven case of diarrhetic shellfish poisoning (DSP) in Canada and North America was recorded in 1990, and the first closures of shellfish harvesting due to DST (associated with the presence of Dinophysis norvegica) occurred in Nova Scotia in 1992, followed by closures in Newfoundland and Labrador in 1993. In 2008, mass mortalities of fishes, birds and mammals in the St. Lawrence Estuary were caused by Alexandrium catenella and high levels of PST. During 2015, the Pacific coast experienced a large algal bloom that extended from California to Alaska. It resulted in the closure of several shellfish harvesting areas in British Columbia due to AST, produced by Pseudo-nitzschia australis. Data from the Canadian Arctic coast is not included in HAEDAT. However, because of the emerging importance of climate change and increased vessel traffic in the Arctic, information on the occurrence of harmful algal species (pelagic and sympagic = sea ice-associated) in that region was compiled from relevant literature and data. The results suggest that these taxa may be more widespread than previously thought in the Canadian Arctic. Information in HAEDAT was not always robust or complete enough to provide conclusions about temporal trends. Compilation of spatial and temporal information from HAEDAT and other records is nevertheless important for evaluating the potential role of harmful algae as a stressor on Canadian marine ecosystems, and will support the next step: developing a knowledge gap analysis that will establish research priorities for determining their consequences on human and ecosystem health.


Assuntos
Ecossistema , Fitoplâncton , Alaska , Regiões Árticas , Colúmbia Britânica , Humanos , América do Norte , Nova Escócia
8.
Toxins (Basel) ; 12(2)2020 01 23.
Artigo em Inglês | MEDLINE | ID: mdl-31979406

RESUMO

[D-Leu1]MC-LY (1) ([M + H]+m/z 1044.5673, Δ 2.0 ppm), a new microcystin, was isolated from Microcystis aeruginosa strain CPCC464. The compound was characterized by 1H and 13C NMR spectroscopy, liquid chromatography-high resolution tandem mass spectrometry (LC-HRMS/MS) and UV spectroscopy. A calibration reference material was produced after quantitation by 1H NMR spectroscopy and LC with chemiluminescence nitrogen detection. The potency of 1 in a protein phosphatase 2A inhibition assay was essentially the same as for MCLR (2). Related microcystins, [D-Leu1]MC-LR (3) ([M + H]+m/z 1037.6041, Δ 1.0 ppm), [D-Leu1]MC-M(O)R (6) ([M + H]+m/z 1071.5565, Δ 2.0 ppm) and [D-Leu1]MC-MR (7) ([M + H]+m/z 1055.5617, Δ 2.2 ppm), were also identified in culture extracts, along with traces of [D-Leu1]MC-M(O2)R (8) ([M + H]+m/z 1087.5510, Δ 1.6 ppm), by a combination of chemical derivatization and LC-HRMS/MS experiments. The relative abundances of 1, 3, 6, 7 and 8 in a freshly extracted culture in the positive ionization mode LC-HRMS were ca. 84, 100, 3.0, 11 and 0.05, respectively. These and other results indicate that [D-Leu1]-containing MCs may be more common in cyanobacterial blooms than is generally appreciated but are easily overlooked with standard targeted LC-MS/MS screening methods.


Assuntos
Microcistinas/isolamento & purificação , Microcystis , Cromatografia Líquida , Microcistinas/química , Proteína Fosfatase 2/antagonistas & inibidores , Espectroscopia de Prótons por Ressonância Magnética , Espectrometria de Massas em Tandem
9.
Am J Health Syst Pharm ; 76(8): 512-520, 2019 Apr 08.
Artigo em Inglês | MEDLINE | ID: mdl-31361862

RESUMO

PURPOSE: Transgender/gender nonconforming (TGNC) adults' worries and coping actions related to discrimination by healthcare professionals were evaluated. METHODS: A community-led participatory approach was used to develop, implement, and analyze the survey. Respondents were recruited using a snowball recruitment method. The questionnaire measured population demographics, health status, worry about discrimination, perceptions of health professional competency in gender-affirming care, and actions taken to cope with discrimination. Analysis used mainly descriptive methods and chi-square analysis, where appropriate. RESULTS: There were 316 usable responses from a total of 325 responses. The typical respondent was young, white, lived within the Midwest and in urban/suburban areas. About half had college degrees and 41.7% had annual household incomes of less than $25,000. High degrees of depression risk and anxiety were reported along with low self-reported health status. Most used pharmacist services with 41.6% reporting worry about discrimination associated with such services. About half (52.5%) reported pharmacists as having very little or no competency in providing gender-affirming care. Common coping actions included delayed seeking of healthcare and non-disclosure of authentic gender identity. Thirteen percent of respondents avoided healthcare because of perceived purposeful embarrassment experienced at a pharmacy. CONCLUSION: Worry about discrimination from pharmacists was common among TGNC adults and was associated with high levels of anxiety. The majority perceived pharmacists to lack competency in transgender care.


Assuntos
Competência Clínica , Farmacêuticos/psicologia , Relações Profissional-Paciente , Discriminação Social , Pessoas Transgênero/psicologia , Adaptação Psicológica , Adolescente , Adulto , Idoso , Assistência à Saúde Culturalmente Competente/organização & administração , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Assistência Farmacêutica/organização & administração , Farmacêuticos/organização & administração , Inquéritos e Questionários/estatística & dados numéricos , Adulto Jovem
10.
Oncologist ; 24(9): e930-e942, 2019 09.
Artigo em Inglês | MEDLINE | ID: mdl-30833489

RESUMO

BACKGROUND: The purpose of this nonrandomized, open-label, phase I study (NCT01285037) was to evaluate the safety and tolerability of merestinib, an oral antiproliferative and antiangiogenic kinase inhibitor, and to determine a recommended phase II dose and schedule for patients with advanced cancer. MATERIALS AND METHODS: This was a multicenter, nonrandomized, open-label, phase I study of oral merestinib consisting of six parts: dose escalation (part A), followed by a four-cohort dose-confirmation study (part B) and subsequently a four-part dose expansion and combination safety testing of merestinib with standard doses of cetuximab (part C), cisplatin (part D), gemcitabine and cisplatin (part E), and ramucirumab (part F) in patients with specific types of advanced cancers. Safety, tolerability, antitumor activity, and pharmacokinetics were evaluated in all cohorts. RESULTS: The dose escalation, confirmation, and expansion results support the dosing of merestinib at 120 mg once daily, based on acceptable exposure and safety at this dose. One complete response was observed in a patient with cholangiocarcinoma, and three patients with cholangiocarcinoma achieved a partial response. Overall, 60 (32%) of the 186 patients enrolled in the study had a best response of stable disease. CONCLUSION: This study demonstrates that merestinib has a tolerable safety profile and potential anticancer activity and warrants further clinical investigation. IMPLICATIONS FOR PRACTICE: Merestinib treatment in patients with advanced cancer demonstrated an acceptable safety profile and potential antitumor activity, supporting its future development in specific disease populations as a monotherapy and/or in combination with other therapies.


Assuntos
Colangiocarcinoma/tratamento farmacológico , Neoplasias Colorretais/tratamento farmacológico , Indazóis/administração & dosagem , Niacinamida/análogos & derivados , Carcinoma de Células Escamosas de Cabeça e Pescoço/tratamento farmacológico , Adulto , Idoso , Inibidores da Angiogênese/administração & dosagem , Anticorpos Monoclonais Humanizados/administração & dosagem , Antineoplásicos/administração & dosagem , Antineoplásicos/efeitos adversos , Proliferação de Células/efeitos dos fármacos , Cetuximab/administração & dosagem , Colangiocarcinoma/patologia , Cisplatino/administração & dosagem , Neoplasias Colorretais/patologia , Desoxicitidina/administração & dosagem , Desoxicitidina/análogos & derivados , Relação Dose-Resposta a Droga , Feminino , Humanos , Indazóis/efeitos adversos , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Niacinamida/administração & dosagem , Niacinamida/efeitos adversos , Inibidores de Proteínas Quinases/administração & dosagem , Carcinoma de Células Escamosas de Cabeça e Pescoço/patologia , Gencitabina , Ramucirumab
12.
JCO Precis Oncol ; 3: 1-13, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-35100734

RESUMO

PURPOSE: Concurrent PIK3CA mutations and fibroblast growth factor receptor (FGFR) alterations occur in multiple cancer types, including estrogen receptor-positive breast cancer, bladder cancer, and endometrial cancer. In this first-in-human combination trial, we explored safety and preliminary efficacy of combining the PI3Kα selective inhibitor alpelisib with the FGFR1-4 selective inhibitor infigratinib. PATIENTS AND METHODS: Patients with PIK3CA-mutant advanced solid tumors, with or without FGFR1-3 alterations, were enrolled in the dose escalation or one of three molecular-defined dose-expansion cohorts. The primary end point was the maximum tolerated dose. Secondary end points included safety, pharmacokinetics, and response. Archival tumor samples were sequenced to explore genomic correlates of response. RESULTS: In combination, both agents were escalated to full, single-agent recommended doses (alpelisib, 300 mg per day continuously; infigratinib, 125 mg per day 3 weeks on followed by 1 week off). The toxicity profile of the combination was consistent with the established safety profile of each agent, although 71% of all patients required at least one treatment interruption or dose reduction. Molecularly selected dose expansions in breast cancer and other solid tumors harboring PIK3CA mutations, alone or in combination with FGFR alterations, identified sporadic responses, predominately in tumor types and genotypes previously defined to have sensitivity to these agents. CONCLUSION: The combination of alpelisib and infigratinib can be administered at full single-agent doses, although the high rate of dose interruption or reduction suggests long-term tolerability may be challenging. In exploratory signal-seeking cohorts of patients harboring dual PIK3CA and FGFR1-3 alterations, no clear evidence of synergistic activity was observed.

13.
Harmful Algae ; 79: 58-63, 2018 11.
Artigo em Inglês | MEDLINE | ID: mdl-30420017

RESUMO

The commercial demand for domoic acid (DA), the phycotoxin responsible for Amnesic Shellfish Poisoning, is currently met by extraction from a diminishing supply of stockpiled contaminated mussels (Mytilus edulis). As this supply becomes scarce, a more reliable source is needed. Purification of the toxin from an algal source would be easier and more economical than from shellfish tissue if algal growth and yield of toxin were maximized. This project was initiated to determine if DA could be produced using large-scale semi-continuous algal cultures, which should reduce labour and shorten the time required for biomass production. Pseudo-nitzschia multiseries was grown in 300-L fibreglass photobioreactors called a Brite-Box™. The effect of temperature and nutrient depletion on the yield of DA by P. multiseries was examined. A decline in maximum cell number without a substantial increase in cellular DA was associated with increased temperature. Maximum total cellular DA (8.8 pg cell-1) was achieved at 20 °C. Semi-continuous culture of P. multiseries is accompanied by increasing amounts of DA lost to the medium. The process was deemed to be feasible for growing P. multiseries but methods to recover this extracellular DA are necessary for this process to be economical.


Assuntos
Diatomáceas/metabolismo , Ácido Caínico/análogos & derivados , Intoxicação por Frutos do Mar , Animais , Bivalves , Estudos de Viabilidade , Ácido Caínico/metabolismo , Frutos do Mar
14.
Harmful Algae ; 77: 108-118, 2018 07.
Artigo em Inglês | MEDLINE | ID: mdl-30005797

RESUMO

The dinoflagellate genus Alexandrium Halim has frequently been associated with harmful algal blooms. Although a number of species from this genus are known to produce paralytic shellfish toxins (PST) and/or cyclic imines (CI), studies on comprehensive toxin profiling using techniques capable of detecting the full range of PST and CI analogues are limited. Isolates of Alexandrium spp. from Atlantic Canada were analyzed by targeted and untargeted liquid chromatography-tandem mass spectrometry (LC-MS). Results showed a number of distinct profiles and wide ranging cell quotas of PST and spirolides (SPX) in both A. catenella (Whedon & Kofoid) Balech and A. ostenfedii (Paulsen) Balech & Tangen. The concentration of PST in A. catenella ranged from 0.0029 to 54 fmol cell-1 with the major components being C2 and GTX4. In addition, putative PST metabolites were confirmed for the first time in A. catenella by high resolution MS/MS. By comparison, A. ostenfeldii isolates showed much lower concentrations of PST (

Assuntos
Dinoflagellida/química , Iminas/análise , Toxinas Marinhas/análise , Cromatografia Líquida , Nova Escócia , Espectrometria de Massas em Tandem
15.
Harmful Algae ; 75: 45-56, 2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-29778225

RESUMO

Benthic dinoflagellates of the toxigenic genus Coolia Meunier (Dinophyceae) are known to have a global distribution in both tropical and temperate waters. The type species, C. monotis, has been reported from the Mediterranean Sea, the NE Atlantic and from Rhode Island, USA in the NW Atlantic, whereas other species in the genus have been reported from tropical locations. Coolia cells were observed in algal drift samples collected at seven sites in Nova Scotia, Canada. Clonal isolates were established from four of these locations and identified with light and scanning electron microscopy, then confirmed with genetic sequencing to be C. monotis. This is the first record of this species in Nova Scotia. The isolates were established and incubated at 18 °C under a 14:10 L:D photoperiod with an approximate photon flux density of 50-60 µmol m-2 s-1. Growth experiments using an isolate from Johnston Harbour (CMJH) were carried out at temperatures ranging from 5 to 30 °C under the same photoperiod with an approximate photon flux density of 45-50 µmol m-2 s-1. Cells tolerated temperatures from 5 to 25 °C with optimum growth and mucilage aggregate production between 15 and 20 °C. Methanol extracts of this isolate examined by Liquid Chromatography-Mass Spectrometry (LC-MS) did not show the presence of the previously reported cooliatoxin. Toxic effects were assayed using two zebrafish bioassays, the Fish Embryo Toxicity (FET) assay and the General Behaviour and Toxicity (GBT) assay. The results of this study demonstrate a lack of toxicity in C. monotis from Nova Scotia, as has been reported for other genetically-confirmed isolates of this species. Conditions in which cell growth that could potentially degrade water quality and provide substrate and dispersal mechanisms for other harmful microorganisms via mucilage production are indicated.


Assuntos
Dinoflagellida/química , Dinoflagellida/crescimento & desenvolvimento , Animais , Cromatografia Líquida , Dinoflagellida/isolamento & purificação , Embrião não Mamífero/efeitos dos fármacos , Genes de Protozoários , Genes de RNAr , Espectrometria de Massas , Nova Escócia , Testes de Toxicidade , Peixe-Zebra
16.
Ecohealth ; 14(1): 144-154, 2017 03.
Artigo em Inglês | MEDLINE | ID: mdl-28213653

RESUMO

Highly pathogenic avian influenza (HPAI) is an important public health concern because of potential for widespread morbidity and mortality in humans and poultry and associated devastating economic losses. We examined how perceptions of the risk of HPAI in poultry vary across communes/wards in the north of Vietnam at different levels of urbanization (rural, peri-urban, urban). Analyses of questionnaire responses from 1081 poultry raisers suggested that the perceived risk of HPAI in poultry was highest in peri-urban and rural settings. We also found that perceived risk was higher when respondents rated settings in which they did not live and that the process of change is related to perceived risk. Compared with others, respondents in peri-urban areas reported less disease management planning; respondents in rural areas reported less ability to separate infected poultry. These findings are consistent with, and add to, the limited previous research on the perceived risk of HPAI in poultry in developing countries. What is new in the present findings is that we describe how urbanization is related to people's perceptions of and ability to respond appropriately to variations in their environment. In particular, the inability to respond is not necessarily because of an inability to perceive change. Rather, rapid and extensive change poses different challenges for poultry management as communes move from rural to peri-urban to urban settings. Our results suggest that health promotion campaigns should address the perceptions and needs of poultry raisers in different settings.


Assuntos
Influenza Aviária/epidemiologia , Influenza Humana/epidemiologia , Urbanização , Animais , Humanos , Virus da Influenza A Subtipo H5N1 , Aves Domésticas/virologia , Vietnã/epidemiologia
17.
J AOAC Int ; 99(5): 1151-62, 2016 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-27524810

RESUMO

Okadaic acid (OA) and its analogs dinophysistoxins-1 (DTX1) and -2 (DTX2) are lipophilic polyethers produced by marine dinoflagellates. These toxins accumulate in shellfish and cause diarrhetic shellfish poisoning (DSP) in humans. Regulatory testing of shellfish is essential to safeguard public health and for international trade. Certified reference materials (CRMs) play a key role in analytical monitoring programs. This paper presents an overview of the interdisciplinary work that went into the planning, production, and certification of calibration-solution CRMs for OA, DTX1, and DTX2. OA and DTX1 were isolated from large-scale algal cultures and DTX2 from naturally contaminated mussels. Toxins were isolated by a combination of extraction and chromatographic steps with processes adapted to suit the source and concentration of each toxin. New 19-epi-DSP toxin analogs were identified as minor impurities. Once OA, DTX1, and DTX2 were established to be of suitable purity, solutions were prepared and dispensed into flame-sealed glass ampoules. Certification measurements were carried out using quantitative NMR spectroscopy and LC-tandem MS. Traceability of measurements was established through certified external standards of established purity. Uncertainties were assigned following standards and guidelines from the International Organization for Standardization, with components from the measurement, stability, and homogeneity studies being propagated into final combined uncertainties.


Assuntos
Diarreia/complicações , Toxinas Marinhas/análise , Ácido Okadáico/análise , Piranos/análise , Padrões de Referência , Intoxicação por Frutos do Mar/complicações , Animais , Calibragem , Cromatografia Líquida/normas , Humanos , Espectroscopia de Ressonância Magnética/normas , Frutos do Mar , Espectrometria de Massas em Tandem/normas
18.
Oncologist ; 21(5): 535-6, 2016 05.
Artigo em Inglês | MEDLINE | ID: mdl-27091421

RESUMO

LESSONS LEARNED: Despite evidence for a role for prolactin signaling in breast and prostate tumorigenesis, a prolactin receptor-binding monoclonal antibody has not produced clinical efficacy.Increased serum prolactin levels may be a biomarker for prolactin receptor inhibition.Results from the pharmacokinetic and pharmacodynamics (PD) studies suggest that inappropriately long dosing intervals and insufficient exposure to LFA102 may have resulted in lack of antitumor efficacy.Based on preclinical data, combination therapy of LFA102 with those novel agents targeting hormonal pathways in metastatic castration-resistant prostate cancer and metastatic breast cancer is promising.Given the PD evidence of prolactin receptor blockade by LFA102, this drug has the potential to be used in conditions such as hyperprolactinemia that are associated with high prolactin levels. BACKGROUND: Prolactin receptor (PRLR) signaling is implicated in breast and prostate cancer. LFA102, a humanized monoclonal antibody (mAb) that binds to and inhibits the PRLR, has exhibited promising preclinical antitumor activity. METHODS: Patients with PRLR-positive metastatic breast cancer (MBC) or metastatic castration-resistant prostate cancer (mCRPC) received doses of LFA102 at 3-60 mg/kg intravenously once every 4 weeks. Objectives were to determine the maximum tolerated dose (MTD) and/or recommended dose for expansion (RDE) to investigate the safety/tolerability of LFA102 and to assess pharmacokinetics (PK), pharmacodynamics (PD), and antitumor activity. RESULTS: A total of 73 patients were enrolled at 5 dose levels. The MTD was not reached because of lack of dose-limiting toxicities. The RDE was established at 60 mg/kg based on PK and PD analysis and safety data. The most common all-cause adverse events (AEs) were fatigue (44%) and nausea (33%) regardless of relationship. Grade 3/4 AEs reported to be related to LFA102 occurred in 4% of patients. LFA102 exposure increased approximately dose proportionally across the doses tested. Serum prolactin levels increased in response to LFA102 administration, suggesting its potential as a biomarker for PRLR inhibition. No antitumor activity was detected. CONCLUSION: Treatment with LFA102 was safe and well tolerated, but did not show antitumor activity as monotherapy at the doses tested.


Assuntos
Anticorpos Monoclonais Humanizados/uso terapêutico , Neoplasias da Mama/tratamento farmacológico , Neoplasias de Próstata Resistentes à Castração/tratamento farmacológico , Receptores da Prolactina/antagonistas & inibidores , Adulto , Idoso , Idoso de 80 Anos ou mais , Anticorpos Monoclonais Humanizados/efeitos adversos , Neoplasias da Mama/patologia , Feminino , Humanos , Masculino , Dose Máxima Tolerável , Pessoa de Meia-Idade , Metástase Neoplásica , Neoplasias de Próstata Resistentes à Castração/patologia , Receptores da Prolactina/fisiologia
19.
Rev Environ Health ; 31(1): 97-102, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26943600

RESUMO

The UN General Assembly has just adopted the post 2015 Sustainable Development Agenda articulated in the 17 Sustainable Development Goals (SDGs). Achieving the SDGs will be furthered by the closer integration of the climate change adaptation (CCA) and disaster risk reduction (DRR) agendas. Gender provides us a valuable portal for considering this integration. Acknowledging that gender relaters to both women and men and that men and women experience climate variability and disasters differently, in this paper the role of women in both CCA and DRR is explored, shifting the focus from women as vulnerable victims to women as critical agents for change with respect to climate change mitigation and adaptation and reduction of disaster risks. Appropriately targeted interventions can also empower women and contribute to more just and inclusive sustainable development.


Assuntos
Mudança Climática , Conservação dos Recursos Naturais , Desastres/prevenção & controle , Sexismo , Aclimatação , Comportamento de Redução do Risco
20.
Oncologist ; 21(11): 1296-1297e, 2016 11.
Artigo em Inglês | MEDLINE | ID: mdl-28178640

RESUMO

LESSONS LEARNED: Patients with metastatic castration-resistant prostate cancer did not tolerate the combination of alisertib with abiraterone and prednisone.There was no clear signal indicating that adding alisertib might be beneficial for those patients progressing on abiraterone. BACKGROUND: We hypothesized that Aurora A kinase (AK) contributes to castrate resistance in prostate cancer (PCa) and that inhibiting AK with alisertib can resensitize PCa cells to androgen receptor (AR) inhibitor abiraterone. METHODS: This was a phase I/II trial to determine the safety and efficacy of alisertib when given in combination with abiraterone plus prednisone (AP). Metastatic castration-resistant prostate cancer (mCRPC) patients were treated with dose escalation (alisertib at 30, 40, and 50 mg orally b.i.d., days 1-7 every 21 days) per standard 3+3 design. RESULTS: Nine of 43 planned subjects were enrolled. The maximum tolerated dose (MTD) was not reached, and the dose-limiting toxicities (DLTs) included neutropenic fever (1 of 9), neutropenia (1 of 9), fatigue with memory impairment (1 of 9), and diarrhea/mucositis (1 of 9). No prostate-specific antigen (PSA) decrease or circulating tumor cell (CTC) changes were observed during the study. Pharmacodynamically, adding alisertib did not affect total testosterone or dehydroepiandrosterone (DHEA) levels. There was some change in neuroendocrine markers after therapy. Mean duration on study was 2.5 months. The trial was terminated early. CONCLUSION: A tolerable dose of alisertib in combination with AP in mCRPC was not established in this study. There was no clear signal indicating that alisertib might be beneficial for patients with mCRPC progressing on abiraterone.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Aurora Quinase A/antagonistas & inibidores , Azepinas/administração & dosagem , Neoplasias de Próstata Resistentes à Castração/tratamento farmacológico , Pirimidinas/administração & dosagem , Idoso , Idoso de 80 Anos ou mais , Androstenos/administração & dosagem , Androstenos/efeitos adversos , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Azepinas/efeitos adversos , Humanos , Masculino , Dose Máxima Tolerável , Pessoa de Meia-Idade , Metástase Neoplásica , Prednisona/administração & dosagem , Prednisona/efeitos adversos , Pirimidinas/efeitos adversos , Testosterona/sangue
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