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1.
Mol Clin Oncol ; 3(3): 639-648, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-26137281

RESUMO

Folate has essential roles in DNA synthesis, repair and methylation. Folate metabolism-related gene variants may modulate the levels of this vitamin and affect the cancer risk. Thus, whether these polymorphisms play an important role in carcinogenesis, particularly colorectal cancer (CRC) development, has been a subject interest. The present study investigated the association between polymorphisms in the methylenetetrahydrofolate reductase (MTHFR), thymidylate synthase (TS) and the reduced folate carrier 1 (RFC1) genes and CRC risk. Polymorphisms in MTHFR (677C>T and 1298A>C), TS [1494del6 and the TS enhancer region (TSER)] and RFC1 (-43T>C, 80G>A and 696C>T) were characterized using polymerase chain reaction-restriction fragment length polymorphism in 477 CRC cases and 514 controls. Although no polymorphisms were significantly associated with the CRC risk in the overall sample, significant associations between folate metabolism-related polymorphisms and CRC risk were identified in the stratified analyses. The MTHFR 677CT/1298AC and MTHFR 1298AC+CC/TSER 2R3R genotypes in the presence of plasma folate levels ≤4.12 ng/ml were associated with significantly increased CRC risk. In addition, individuals with the MTHFR 677TT/TSER 3R3R or MTHFR 677/TSER 3R3R/TS 1494 0bp6bp+6bp6bp genotypes and diabetes mellitus (DM) were at an increased risk for CRC. Therefore, the data suggest that i) MTHFR polymorphisms combined with low plasma folate levels and ii) polymorphisms in folate metabolism-related genes combined with metabolic syndrome risk factors (hypertension and DM) increase the odds of developing CRC.

2.
Arterioscler Thromb Vasc Biol ; 34(11): 2478-85, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-25212233

RESUMO

OBJECTIVE: The metabolic syndrome (MetS) may contribute to the pathogenesis of venous thromboembolism (VTE), but this association requires additional investigation. APPROACH AND RESULTS: We performed a patient-level meta-analysis of case-control and cohort studies that evaluated the role of MetS and risk of unprovoked VTE. For case-control studies, odds ratios and 95% confidence intervals were calculated using logistic regression analysis to estimate the influence of individual variables on the risk of VTE; χ(2) tests for trend were used to investigate the effect of increasing number of components of MetS on the risk of VTE and to explore the influence of abdominal obesity on this relationship. For cohort studies, hazard ratios and 95% confidence interval were calculated using multivariable Cox regression analysis. Six case-control studies were included (908 cases with unprovoked VTE and 1794 controls): in multivariate analysis, MetS was independently associated with VTE (odds ratio, 1.91; 95% confidence interval, 1.57-2.33), and both MetS and abdominal obesity were better predictors of unprovoked VTE than obesity defined by the body mass index. Two prospective cohort studies were included (26,531 subjects and 289 unprovoked VTE events): age, obesity, and abdominal obesity, but not MetS were associated with VTE. CONCLUSIONS: Case-control but not prospective cohort studies support an association between MetS and VTE. Abdominal adiposity is a strong risk factor for VTE.


Assuntos
Síndrome Metabólica/complicações , Tromboembolia Venosa/epidemiologia , Adulto , Idoso , Estudos de Casos e Controles , Estudos de Coortes , Feminino , Humanos , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Obesidade Abdominal/complicações , Fatores de Risco
3.
Blood Res ; 49(1): 61-4, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24724069

RESUMO

Oxaliplatin is a platinum compound used in patients with gastrointestinal malignancies. It is known to evoke a drug-induced immune-mediated thrombocytopenia, which has not been reported in Korea. We describe a 53-year-old man who developed oxaliplatin-induced immune-mediated thrombocytopenia during chemotherapy for colon cancer. Oxaliplatin-dependent IgG platelet antibodies were detected in his serum on flow cytometry. He was treated with immunoglobulin and corticosteroids without any complications. Physicians should consider oxaliplatin-induced immune-mediated thrombocytopenia, when a sudden, isolated thrombocytopenia develops during chemotherapy with oxaliplatin.

4.
J Korean Med Sci ; 29(2): 164-71, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24550640

RESUMO

In 2010, we proposed the first Korean Guidelines for the Prevention of Venous Thromboembolism (VTE). It was applicable to Korean patients, by modifying the contents of the second edition of the Japanese guidelines for the prevention of VTE and the 8th edition of the American College of Chest Physicians (ACCP) evidence-based clinical practice guidelines. From 2007 to 2011, we conducted a nationwide study regarding the incidence of VTE after major surgery using the Health Insurance Review and Assessment Service (HIRA) database. In addition, we have considered the 9th edition of the ACCP Evidenced-Based Clinical Practice Guidelines, published in 2012. It emphasized the importance of clinically relevant events as opposed to asymptomatic outcomes with preferences for both thrombotic and bleeding outcomes. Thus, in the development of the new Korean guidelines, three major points were addressed: 1) the new guidelines stratify patients into 4 risk groups (very low, low, moderate, and high) according to the actual incidence of symptomatic VTE from the HIRA databases; 2) the recommended optimal VTE prophylaxis for each group was modified according to condition-specific thrombotic and bleeding risks; 3) guidelines are intended for general information only, are not medical advice, and do not replace professional medical care and/or physician advice.


Assuntos
Anticoagulantes/uso terapêutico , Trombólise Mecânica , Tromboembolia Venosa/terapia , Fatores Etários , Anticoagulantes/efeitos adversos , Povo Asiático , Medicina Baseada em Evidências , Heparina de Baixo Peso Molecular/uso terapêutico , Humanos , Neoplasias/complicações , Neoplasias/cirurgia , República da Coreia , Medição de Risco , Procedimentos Cirúrgicos Operatórios/efeitos adversos , Tromboembolia Venosa/etiologia , Tromboembolia Venosa/prevenção & controle
5.
Gene ; 533(2): 558-64, 2014 Jan 10.
Artigo em Inglês | MEDLINE | ID: mdl-24100087

RESUMO

BACKGROUND: 5-Fluorouracil (5-FU) is a cornerstone of chemotherapy for colorectal cancer (CRC), and the major targets of 5-FU are thymidylate synthase (TS), methylenetetrahydrofolate reductase (MTHFR), and reduced folate carrier 1 (RFC1). We hypothesized that polymorphisms in the genes encoding these proteins would be associated with CRC patient survival. PATIENTS AND METHODS: We genotyped the following polymorphisms in 372 CRC patients: TS enhancer region (TSER), TS 1494del6, MTHFR 677C>T and 1298A>C, and RFC1 -43T>C, 80G>A, and 696C>T. Using Kaplan-Meier curves, log-rank tests, and Cox proportional hazard models, we evaluated associations between these polymorphisms and overall survival (OS). RESULTS: The combined TS 1494 0bp6bp+6bp6bp genotype was associated with reduced OS compared to the TS 1494 0bp0bp genotype. Among rectal cancer patients, the RFC1 -43CC and 80AA genotypes were associated with favorable OS. CONCLUSIONS: Our data suggest that TS and RFC1 polymorphisms are associated with CRC prognosis in Korean patients. Further studies are needed to verify these findings.


Assuntos
Neoplasias Colorretais/genética , Neoplasias Colorretais/mortalidade , Ácido Fólico/metabolismo , Proteína Carregadora de Folato Reduzido/genética , Timidilato Sintase/genética , Idoso , Povo Asiático/genética , Neoplasias Colorretais/tratamento farmacológico , Feminino , Fluoruracila/farmacocinética , Fluoruracila/uso terapêutico , Humanos , Masculino , Redes e Vias Metabólicas/genética , Metilenotetra-Hidrofolato Redutase (NADPH2)/genética , Pessoa de Meia-Idade , Polimorfismo Genético , População/genética , República da Coreia/epidemiologia , Análise de Sobrevida
6.
Oncol Rep ; 31(2): 995-1002, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24337371

RESUMO

The microRNA (miR)-34 family is a direct transcriptional target of tumor-suppressor TP53 and loss of miR-34 function may impair TP53-mediated cell cycle arrest and apoptosis. In the present study, we investigated whether the single nucleotide polymorphisms (SNPs) rs4938723 (T>C) in the promoter region of miR-34b/c and Arg72Pro (G>C) in codon 72 of TP53 are independently or complementarily associated with the risks and clinical outcomes of colorectal cancer (CRC) and whether the combined effect of these SNPs and metabolic risk factors are related to CRC. We evaluated the SNPs in 545 CRC patients and 428 healthy controls using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and DNA sequence analysis. We found that the GC and GC/CC genotypes of TP53 Arg72Pro were associated with decreased risk of CRC (adjusted OR = 0.727 for GC; OR = 0.735 for GC/CC). The combined genotypes of TT-GC and CC-GG were significantly associated with reduced CRC risk (adjusted OR = 0.628 for TT-GC; OR = 0.381 for CC-GG, respectively). The SNP rs4938723 and diabetes mellitus (DM) together were associated with an increased CRC risk, but the SNP TP53 Arg72Pro CC with DM showed a protective effect against CRC. These findings indicate that rs4938723 in the promoter region of pri-miR-34b/c and the SNP in TP53 codon 72 were related to decreased risk of CRC in the population studied and those metabolic diseases and genetic variants influence each other with regard to CRC susceptibility.


Assuntos
Neoplasias Colorretais/genética , MicroRNAs/genética , Proteína Supressora de Tumor p53/genética , Apoptose/genética , Povo Asiático/genética , Sequência de Bases , Biomarcadores Tumorais/genética , Pontos de Checagem do Ciclo Celular/genética , Neoplasias Colorretais/mortalidade , Feminino , Frequência do Gene , Predisposição Genética para Doença , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade , Polimorfismo de Nucleotídeo Único , Regiões Promotoras Genéticas/genética , República da Coreia , Estudos Retrospectivos , Risco , Análise de Sequência de DNA , Resultado do Tratamento
7.
PLoS One ; 8(8): e71641, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23967228

RESUMO

Fibroblast growth factor-4 (FGF4) is expressed in embryonic stages and in adult tissues, where it plays critical roles in modulating multiple cellular functions. However, the exact roles of FGF4 on proliferation and differentiation of embryonic stem cells (ESCs) are not completely understood. Exogenous addition of FGF4 stimulated proliferation of mouse ESCs (mESCs), as proven by the increases in DNA synthesis and cell cycle regulatory protein induction. These increases were almost completely inhibited by pre-treating cells with anti-FGF4 antibody. FGF4 also activated c-Jun N-terminal kinase (JNK) and extracellular-signal regulated kinase (ERK) signaling, but not p38 kinase. Blockage of JNK signaling by SP600125 or by transfection with its specific siRNA significantly inhibited FGF4-stimulated cell proliferation through the suppression of c-Jun induction and activator protein-1 (AP-1) activity. However, ERK or p38 kinase inhibitor did not affect FGF4-stimulated proliferation in mESCs. FGF4 suppressed osteogenic differentiation of mESCs by inhibiting expression of transcription factors involved in bone formation. Further, exogenous FGF4 addition stimulated proliferation of human periodontal ligament stem cells (hPDLSCs) and bone marrow mesenchymal stem cells (BMMSCs) via activation of ERK signaling. FGF4 also augmented mineralization of hPDLSCs, but not of BMMSCs. Collectively, it is suggested that FGF4 triggers proliferation of stem cells by activating MAPK-mediated signaling, while it affects differently osteogenic differentiation according to the origins of stem cells.


Assuntos
Células-Tronco Embrionárias/efeitos dos fármacos , Células-Tronco Embrionárias/metabolismo , Fator 4 de Crescimento de Fibroblastos/farmacologia , Proteínas Proto-Oncogênicas c-jun/metabolismo , Transdução de Sinais/efeitos dos fármacos , Animais , Anticorpos Monoclonais/farmacologia , Calcificação Fisiológica/efeitos dos fármacos , Proteínas de Ciclo Celular/metabolismo , Diferenciação Celular/efeitos dos fármacos , Linhagem Celular , Proliferação de Células/efeitos dos fármacos , Subunidade alfa 1 de Fator de Ligação ao Core/genética , Subunidade alfa 1 de Fator de Ligação ao Core/metabolismo , Células-Tronco Embrionárias/citologia , MAP Quinases Reguladas por Sinal Extracelular/metabolismo , Fator 4 de Crescimento de Fibroblastos/antagonistas & inibidores , Regulação da Expressão Gênica/efeitos dos fármacos , Proteínas Quinases JNK Ativadas por Mitógeno/metabolismo , Camundongos , Osteoblastos/citologia , Osteoblastos/efeitos dos fármacos , Osteogênese/efeitos dos fármacos , Fosforilação , Ligação Proteica , Fator de Transcrição Sp7 , Fator de Transcrição AP-1/metabolismo , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Proteínas Quinases p38 Ativadas por Mitógeno/metabolismo
8.
Gene ; 524(2): 156-60, 2013 Jul 25.
Artigo em Inglês | MEDLINE | ID: mdl-23632240

RESUMO

BACKGROUND: Numerous studies have focused on the association between miR-34 family members, which are direct p53 targets, and carcinogenesis of many cancers, including hepatocellular carcinoma (HCC). This study aimed to assess whether polymorphisms in the single-nucleotide polymorphism miR-34b/c T>C (rs4938723) and TP53 Arg72Pro (rs1042522) increase the risk of HCC and influence outcome in patients with HCC. PATIENTS AND METHODS: We enrolled 157 HCC patients and 201 cancer-free control subjects from the Korean population. MicroRNA polymorphisms were genotyped using the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. RESULTS: We found that the miR-34b/c TC+CC frequency was significantly higher in HCC patients than in controls (adjusted odds ratio [AOR]: 1.580; 95% confidence interval [CI]: 1.029-2.426). The miR-34b/c CC-TP53 Arg/Arg combination significantly increased the risk of HCC (AOR: 13.644; 95% CI: 1.451-128.301). The SNPs miR-34b/c T>C and TP53 Arg72Pro(G>C) had no influence on survival of HCC patients. CONCLUSIONS: Our findings suggest that loss of the T allele in miR-34b/c T>C, and the miR-34b/c CC-TP53 Arg/Arg combination increases the risk of HCC in the Korean population.


Assuntos
Carcinoma Hepatocelular/genética , Neoplasias Hepáticas/genética , MicroRNAs/genética , Regiões Promotoras Genéticas , Idoso , Alelos , Povo Asiático/genética , Estudos de Casos e Controles , Feminino , Frequência do Gene , Estudos de Associação Genética , Predisposição Genética para Doença , Técnicas de Genotipagem , Humanos , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Razão de Chances , Reação em Cadeia da Polimerase , Polimorfismo de Fragmento de Restrição , Polimorfismo de Nucleotídeo Único , Estudos Retrospectivos , Fatores de Risco , Proteína Supressora de Tumor p53/genética
9.
Blood Res ; 48(1): 58-62, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23589798

RESUMO

Acquired hemophilia A (AHA) is a bleeding disorder caused by the development of an auto-antibody against endogenous factor VIII (FVIII). In this study, the epitope of the autoantibody was identified in a 67-year-old female patient with AHA. A prolonged activated partial thromboplastin time (77.4 s) that failed to correct in an incubation mixing test (68.2 s), a decreased FVIII activity, and a high FVIII inhibitor (14.6 Bethesda units/mL) were observed. Enzyme-linked immunosorbent assay demonstrated that the antibody belonged to the immunoglobulin G4 subclass. An immunoblotting assay revealed the light chain (A3/C1/C2 domain) of FVIII as the binding region of the antibody. The bleeding experienced by our patient resulted from the interference of FVIII binding to both FIX by anti-A3 antibodies and phospholipids and von Willebrand factor by anti-C2 antibodies. To the best of our knowledge, this is the first study in Korea characterizing an autoantibody in the context of AHA.

10.
Biol Blood Marrow Transplant ; 19(4): 640-6, 2013 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23380345

RESUMO

Pre-engraftment syndrome (PES) is poorly characterized, and its clinical significance and the prognostic impact after unrelated cord blood transplantation (CBT) are unclear. To address these issues, we retrospectively analyzed the incidence, risk factors, and clinical outcomes of PES in unrelated CBT recipients. Data of 381 patients who received unrelated CBT from 18 medical centers in Korea were reviewed. PES was defined as unexplained fever >38.3°C not associated with infection, and/or unexplained skin rash with or without evidence of fluid retention before neutrophil recovery. PES developed in 102 patients (26.8%) at a median of 7 days after CBT. Of these patients, 74 patients (72.5%) received intravenous corticosteroid at a median dose of 1 mg/kg/day, and of these, 95% showed clinical improvement. Risk factors for developing PES included low risk disease, myeloablative conditioning, graft-versus-host disease (GVHD) prophylaxis without methotrexate or corticosteroid, and >5.43 x 10(7)/kg infused nucleated cells. Absence of PES was one of the risk factors for graft failure in multivariate analysis. The cumulative incidence of grade II to grade IV acute GVHD by 100 days after CBT was higher in patients with PES than in those without PES (56.0% versus 34.4%, P < .01). PES was not associated with chronic GVHD, treatment-related mortality, relapse, or overall survival. PES seems to be common after CBT and may be associated with enhanced engraftment without significant morbidity.


Assuntos
Corticosteroides/uso terapêutico , Transplante de Células-Tronco de Sangue do Cordão Umbilical , Sobrevivência de Enxerto/imunologia , Doença Enxerto-Hospedeiro/imunologia , Doença Enxerto-Hospedeiro/terapia , Doença Aguda , Adolescente , Adulto , Idoso , Criança , Pré-Escolar , Feminino , Rejeição de Enxerto/prevenção & controle , Doença Enxerto-Hospedeiro/mortalidade , Doença Enxerto-Hospedeiro/prevenção & controle , Humanos , Lactente , Masculino , Pessoa de Meia-Idade , Agonistas Mieloablativos/uso terapêutico , Prognóstico , Estudos Retrospectivos , Índice de Gravidade de Doença , Pele/imunologia , Pele/patologia , Análise de Sobrevida , Síndrome , Condicionamento Pré-Transplante , Transplante Homólogo , Doadores não Relacionados
11.
Thromb Res ; 131(4): e133-40, 2013 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23399441

RESUMO

UNLABELLED: Patients with cancer have been associated with increased risk of recurrent venous thromboembolism (VTE). However, data on recurrent VTE in Asian patients with advanced solid cancers are limited. METHODS: This study was conducted using data from the Korean VTE registry, which is an ongoing, prospective database. Patients were eligible if they had diagnosed with recurrent/metastatic solid cancers and initiated anticoagulation therapy following index VTE diagnosis. A total of 449 patients were included in this analysis. The 6-month and 12-month cumulative incidences of recurrent VTE were 20.6% and 27.0%, respectively. Isolated pulmonary embolism (PE) (51%) was the most predominant recurrence type. Pancreas as the primary tumor site, poor Eastern Cooperative Oncology Group performance status at the time of index VTE diagnosis, and initial presentation with PE were independent risk factors for developing recurrent VTE. With a median follow-up of 29.1months (range, 1.0-91.2), the median overall survival (OS) was 11.9months. Patients with recurrent VTE had a significantly worse OS than those without recurrent VTE (median, 8.4 vs. 13.0months, respectively; P=0.001). In conclusion, the incidence of recurrent VTE in Korean patients with advanced solid cancers is comparable with Caucasian patients. Pancreas as the primary tumor site, poor performance status, and initial presentation with PE are independent recurrent VTE risk factors in advanced cancer VTE patients. Additionally, OS is adversely affected by recurrent VTE.


Assuntos
Anticoagulantes/uso terapêutico , Neoplasias/epidemiologia , Tromboembolia Venosa/tratamento farmacológico , Tromboembolia Venosa/epidemiologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Anticoagulantes/efeitos adversos , Feminino , Humanos , Incidência , Masculino , Pessoa de Meia-Idade , Neoplasias/sangue , Neoplasias/tratamento farmacológico , Prognóstico , Estudos Prospectivos , Recidiva , Fatores de Risco , Análise de Sobrevida , Tromboembolia Venosa/etiologia
12.
Acta Haematol ; 129(4): 197-206, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23257958

RESUMO

BACKGROUND AND AIMS: Immunomodulatory properties of mesenchymal stem cells (MSCs) have been applied to reduce the incidence of graft-versus-host disease (GVHD) after hematopoietic stem cell transplantation (HSCT). Among the various sources of MSCs that have immunomodulatory effects in vitro, only placenta-derived MSCs (PD-MSCs) have not been evaluated in an in vivo model of GVHD. In this study, we investigated the immunomodulatory properties of PD-MSCs in vitro and evaluated their clinical potential for controlling GVHD in an animal model. METHODS: A GVHD animal model was established by transplanting C57BL/6 donor bone marrow cells and spleen cells into lethally irradiated BALB/c recipient mice. To control GVHD, human PD-MSCs were transplanted into recipient mice (5 × 10(5) or 1 × 10(6) cells). RESULTS: PD-MSCs suppressed mitogen-stimulated T cell proliferation in vitro in a dose-dependent manner. Moreover, PD-MSCs inhibited cytokine secretion (interleukin-12, tumor necrosis factor-α and interferon-γ) of activated T cells. In vivo, the survival rate in the PD-MSC group (transplanted with 1 × 10(6) cells) was higher than that in the control group and histological scores were low in the PD-MSC group. CONCLUSION: We present the first evidence that human PD-MSCs can efficiently control GVHD in an HSCT in vivo model.


Assuntos
Doença Enxerto-Hospedeiro/imunologia , Doença Enxerto-Hospedeiro/prevenção & controle , Imunomodulação , Células-Tronco Mesenquimais/citologia , Células-Tronco Mesenquimais/imunologia , Placenta/citologia , Animais , Transplante de Medula Óssea/imunologia , Diferenciação Celular , Modelos Animais de Doenças , Feminino , Fase G2 , Doença Enxerto-Hospedeiro/mortalidade , Doença Enxerto-Hospedeiro/patologia , Humanos , Interferon gama/metabolismo , Interleucina-12/metabolismo , Ativação Linfocitária/imunologia , Transplante de Células-Tronco Mesenquimais , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos C57BL , Gravidez , Taxa de Sobrevida , Linfócitos T/metabolismo , Fator de Necrose Tumoral alfa/metabolismo
13.
Clin Appl Thromb Hemost ; 19(3): 309-14, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22327825

RESUMO

The frequency of methylenetetrahydrofolate reductase (MTHFR) mutations varies between racial and ethnic groups, and there are also conflicting data regarding MTHFR gene mutations in Asian patients with venous thromboembolism (VTE). The aim of this study was to examine the association between common MTHFR gene mutations (677C>T and 1298A>C) and risk of VTE in Koreans. This study was a retrospective case-control study. We enrolled 203 patients with VTE and 403 controls. For the 677C>T polymorphism, there was no difference in the frequency of the CT genotype and TT genotype between the patients with VTE and the controls. However, in the recessive analysis (CC + CT vs TT), the frequency of the TT genotype was significantly higher in VTE than in controls (odds ratio = 1.700; 95% confidence interval = 1.108-2.607, P = .015). In conclusion, the TT genotype of MTHFR 677C>T increases the risk of VTE in Koreans. This finding was supported by meta-analysis of previous Asian studies.


Assuntos
Povo Asiático/genética , Metilenotetra-Hidrofolato Redutase (NADPH2)/genética , Mutação , Tromboembolia Venosa/genética , Adulto , Idoso , Feminino , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade , Risco , Tromboembolia Venosa/etiologia
14.
Gene ; 512(2): 275-81, 2013 Jan 10.
Artigo em Inglês | MEDLINE | ID: mdl-23137631

RESUMO

BACKGROUND: Polymorphisms of endothelial nitric oxide synthases (eNOS) have been shown to be associated with cancer susceptibility. However, the results of such studies are conflicting to date. We investigated whether polymorphisms of the eNOS gene correlated with patients with colorectal cancer (CRC), relative to healthy individuals. PATIENTS AND METHODS: In the present study, we analyzed three polymorphisms of eNOS (-786T>C, 4a4b, and 894G>T) in 509 healthy controls and 528 patients with CRC. The genotyping of eNOS polymorphisms was performed using polymerase chain reaction or polymerase chain reaction-restriction fragment length polymorphism assays. RESULTS: We found that the TC+CC genotype of the -786T>C polymorphism was significantly associated with an increased risk of CRC compared with the TT genotype. Similarly, the GT+TT genotype of the 894G>T polymorphism was associated with an increased susceptibility to CRC. However, no evidence was found for any association between the 4a4b polymorphism and CRC risk. In addition, the C/4b/G (-786T>C/4a4b/894G>T) haplotype was significantly associated with increased risk of CRC and C/4b/T (-786T>C/4a4b/894G>T) haplotype was only detected in CRC patients. CONCLUSIONS: Our study suggests that the eNOS -786T>C and 894G>T polymorphisms may be associated with the development of CRC in the Korean population.


Assuntos
Neoplasias Colorretais/genética , Predisposição Genética para Doença , Óxido Nítrico Sintase Tipo III/genética , Polimorfismo de Fragmento de Restrição , Idoso , Povo Asiático , Neoplasias Colorretais/enzimologia , Feminino , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade , República da Coreia
15.
Int J Clin Oncol ; 18(6): 1032-41, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23132736

RESUMO

BACKGROUND: Angiogenesis plays an important role in tumor development, progression, and metastasis. Vascular endothelial growth factor (VEGF) is a key regulator of angiogenesis. However, the contribution of common VEGF polymorphisms to colorectal cancer (CRC) prognosis remains unclear. METHODS: We have genotyped four polymorphisms of VEGF (-2578C>A, -1154G>A, -634G>C, and 936C>T) in 350 CRC cases from the Korean population. The genotyping of VEGF polymorphisms was performed by polymerase chain reaction-restriction fragment length polymorphism assay. RESULTS: Although not every VEGF polymorphism was significantly correlated with patient prognosis in overall 350 CRC patients, we found that the VEGF -2578CA genotype was associated with a significantly poor prognosis for rectal cancers compared to the CC genotype (HR = 2.156; 95 % CI 1.090-4.267; P = 0.028). In addition, we found that the -2578A/-1154G/-634G/+936C haplotype was significantly associated with a decreased overall survival (OS) rate in all 350 CRC patients (HR = 2.530; 95 % CI 1.340-4.780; P = 0.004). In combination analysis, we found that the combined VEGF -2578CA+AA/-1154GG genotype was associated with a poor OS rate in all 350 CRC patients (HR = 2.068; 95 % CI 1.159-3.693; P = 0.015). CONCLUSIONS: The VEGF gene polymorphisms investigated in this study were not found to be independent prognostic markers in Korean CRC populations. However, our results suggest that the VEGF -2578C>A variant may be a potential genetic marker for rectal cancer prognosis. Further large population studies are warranted to define whether the -2578C>A polymorphism is a prognostic marker of rectal cancer.


Assuntos
Neoplasias Colorretais/genética , Neovascularização Patológica/genética , Prognóstico , Fator A de Crescimento do Endotélio Vascular/genética , Idoso , Biomarcadores Tumorais/genética , Neoplasias Colorretais/patologia , Feminino , Predisposição Genética para Doença , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Neovascularização Patológica/patologia , Polimorfismo de Nucleotídeo Único
16.
Mol Carcinog ; 52 Suppl 1: E60-9, 2013 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-23169005

RESUMO

Vascular endothelial growth factor (VEGF) and its receptor kinase insert domain-containing receptor (KDR) play crucial roles in angiogenesis, which contributes to the development and progression of solid tumors. The aim of this study was to investigate the associations of VEGF (-2578C > A, -1154G > A, -634G > C, and 936C > T) and KDR (-604T > C and 1192G > A) polymorphisms with the development of colorectal cancer (CRC). A total of 882 participants (390 CRC patients and 492 controls) were enrolled in the study. The genotyping of VEGF and KDR polymorphisms was performed by polymerase chain reaction-restriction fragment length polymorphism assay. We found that the CT and TT genotype of the 936C > T was associated with an increased risk of CRC compared with the CC genotype as the dominant model for the T allele. In addition, we also found a increased CRC risk with TC + CC genotype of KDR -604T > C compared with TT genotype in CRC patients and control subjects. Similarly, KDR 1192G > A also showed significant association between 1192G > A variants and risk of CRC. In the haplotype analyses, haplotype -2578A/-1154A/-634G/936T of VEGF polymorphisms and haplotype -604C/1192G and -604C/1192A of KDR polymorphisms were associated with an increased susceptibility of CRC. Our results suggest that the VEGF 936C > T, KDR -604T > C, and KDR 1192G > A polymorphisms may be contribute to CRC risk in the Korean population.


Assuntos
Neoplasias Colorretais/etiologia , Predisposição Genética para Doença , Polimorfismo de Nucleotídeo Único/genética , Fator A de Crescimento do Endotélio Vascular/genética , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/genética , Biomarcadores Tumorais/genética , Estudos de Casos e Controles , Feminino , Interação Gene-Ambiente , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Reação em Cadeia da Polimerase , Prognóstico , República da Coreia , Fatores de Risco
17.
Thromb Res ; 130(4): e199-202, 2012 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22901545

RESUMO

There have been conflicting results on seasonal variation in the occurrence of venous thromboembolism (VTE). It also has never been studied in Asian population. To address these issues, we investigated seasonal changes of the incidence of VTE in Korean population using 1,495 patients with VTE between January 2001 and December 2010. VTE occurred most frequently in the winter and least frequently in the summer (χ2=11.83, P=0.008). In the subset analyses, the same trend was shown in the PE±DVT group, the unprovoked VTE group, and the VTE without malignancy group. The monthly occurrence rate peaked in December and was at its lowest in July (P=0.004). In conclusion, our study provides evidence that there is an increased risk for VTE in Korean population in the winter season.


Assuntos
Veias/patologia , Tromboembolia Venosa/diagnóstico , Tromboembolia Venosa/epidemiologia , Feminino , Humanos , Incidência , Masculino , Pessoa de Meia-Idade , República da Coreia/epidemiologia , Fatores de Risco , Estações do Ano , Tromboembolia Venosa/patologia
18.
Yonsei Med J ; 53(3): 662-6, 2012 May.
Artigo em Inglês | MEDLINE | ID: mdl-22477015

RESUMO

In this report, we describe a Korean patient with May-Hegglin anomaly from a mutation of the MYH9 gene. The proband was a 21-year-old man with thrombocytopenia. He did not have a bleeding tendency. His neutrophil count was normal at 7490/mm³; however, the neutrophils contained abnormal basophilic inclusions in their cytoplasm. The platelet count was decreased at 15,000/mm³ with giant platelets. Coagulation test results were not remarkable. Direct sequencing of MYH9 revealed that he was heterozygous for a mutation in exon 1, which was a 97T>A substitution mutation affecting codon 33, substituting tryptophan with arginine (Trp33Arg). Family study showed that both of his parents had normal phenotype and genotypes, indicating a de novo occurrence of the mutation in the proband.


Assuntos
Éxons/genética , Proteínas Motores Moleculares/genética , Cadeias Pesadas de Miosina/genética , Trombocitopenia/genética , Adulto , Povo Asiático , Perda Auditiva Neurossensorial , Humanos , Masculino , Mutação , Adulto Jovem
19.
Clin Appl Thromb Hemost ; 18(4): 416-20, 2012 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-22275393

RESUMO

Although it was thought that platelets did not play a significant role in the pathogenesis of venous thromboembolism (VTE), several studies demonstrated that a marked activation of platelets occurs in patients with VTE. We carried out a case-control study to investigate the effect of the T744C P2RY12 polymorphism on the risk of VTE in the Korean population. We enrolled 154 consecutive patients with VTE and 415 healthy controls. Genotype frequencies for patients with TT, TC, and CC were 71.4%, 24.7%, and 3.9% and in the controls, 68.2%, 30.1%, and 1.7%, respectively. T744C P2RY12 polymorphism did not significantly affect the risk of VTE. Our study shows that T744C P2RY12 polymorphism did not significantly affect the risk of VTE in the Korean population.


Assuntos
Polimorfismo Genético , Receptores Purinérgicos P2Y12/genética , Tromboembolia/genética , Idoso , Povo Asiático , Estudos de Casos e Controles , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , República da Coreia , Fatores de Risco
20.
Int J Hematol ; 95(1): 107-11, 2012 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-22167655

RESUMO

Human herpesvirus 8-positive (HHV-8⁺) and Epstein-Barr virus-positive (EBV⁺) germinotropic lymphoproliferative disorder (GLD) is extremely rare and occurs most commonly in immunocompetent persons who are human immunodeficiency virus (HIV)-seronegative. It is also recognized as a favorable response to conventional chemotherapy. Here, we report a case of a 75-year-old man with an incidentally found mass in the neck, compatible with GLD, which was detected by positron emission tomography (PET). Computed tomography (CT) scan, PET, and bone marrow studies showed only the left neck mass and no evidence of metastasis. Excisional biopsy of the mass was performed. The patient received four courses of CHOP (cyclophosphamide, doxorubicin, vincristine, and prednisolone) therapy. After these treatments, he remained disease-free for 19 months. To the best of our knowledge, only five cases of HHV-8⁺, EBV⁺ GLD have been documented. This is the first such case report in Asia.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Centro Germinativo/patologia , Infecções por Herpesviridae/complicações , Herpesvirus Humano 4/isolamento & purificação , Herpesvirus Humano 8/isolamento & purificação , Linfoma/complicações , Linfoma/tratamento farmacológico , Idoso , Ciclofosfamida/uso terapêutico , Doxorrubicina/uso terapêutico , Centro Germinativo/virologia , Neoplasias de Cabeça e Pescoço/complicações , Neoplasias de Cabeça e Pescoço/tratamento farmacológico , Neoplasias de Cabeça e Pescoço/patologia , Neoplasias de Cabeça e Pescoço/virologia , Infecções por Herpesviridae/virologia , Humanos , Linfoma/patologia , Linfoma/virologia , Masculino , Prednisona/uso terapêutico , Vincristina/uso terapêutico
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