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1.
Pathol Res Pract ; 260: 155404, 2024 Jun 12.
Artigo em Inglês | MEDLINE | ID: mdl-38878667

RESUMO

INTRODUCTION: The Preferentially Expressed Antigen in Melanoma (PRAME) immunostain has seen significant diagnostic use in confirming malignancy for melanocytic lesions. However, the expression of PRAME in genital melanocytic lesions have not been reported. In this study, PRAME staining was performed on a cohort of genital melanocytic lesions, aiming to investigate the diagnostic role of PRAME in genital melanocytic lesions and its expression in atypical genital nevi. METHODOLOGY: A cohort including genital invasive melanoma, melanoma-in-situ, atypical genital nevus (AGN), compound nevus, intradermal nevus, blue nevus, lentigo and melanosis was retrieved with histology reviewed and PRAME immunostaining performed. RESULTS: A total of 66 cases were reviewed. The average proportion expression of PRAME were 56.75 % and 57.43 % for invasive melanoma and melanoma-in-situ, with average H-scores of 153.5/300 and 163.14/300 respectively, which were greater than AGN (3.25 %, 7.75/300, p<0.001), compound/intradermal nevi, lentigo/melanosis, and background junctional melanocytes (<1 %, <1/300, p<0.001). The different cutoffs of PRAME expression, the sensitivity and specificity were 65.22 % and 100 % (>100/300); 69.57 % and 95.83 % (>10/300); and 82.61 % and 93.75 % (≥1/300) respectively. Low level PRAME expression was seen in half of the cases of AGN (n=2/4, 50 %), and at low cutoffs (>10/300 and ≥1/300) unable to differentiate invasive melanoma from AGN (p>0.05). CONCLUSIONS: For genital melanocytic lesions, PRAME immunostain shows high specificity at strong and diffuse staining. AGN not uncommonly display low level expression. Focal and/or weak PRAME expression should not be considered as an absolute indication of malignancy, and comprehensive histological assessment remains the key to accurate diagnosis of melanocytic lesions.

2.
Int J Rheum Dis ; 26(10): 2031-2036, 2023 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-37574925

RESUMO

Anti-melanoma differentiation-associated gene 5 (MDA5) dermatomyositis is characterized by serological detection of anti-MDA5 antibody and rapidly progressive interstitial lung disease. In this study, the largest cohort of skin biopsies to date of anti-MDA5 dermatomyositis was reviewed and compared with cases of dermatomyositis with negative serology. Findings contribute to the histological diagnosis and evaluation of the severity of cutaneous inflammation in anti-MDA5 dermatomyositis. Skin biopsies collected over a 7-year period from individuals with clinically and histologically confirmed dermatomyositis with anti-MDA5 serology were reviewed. A total of 46 cases with 17 anti-MDA5 positive cases were retrieved. Patients with positive antibody were younger (53.7 vs. 60.6 years, p = .013). No differences in epidermal changes (p > .05) were observed. Pertaining to interface changes, anti-MDA5 dermatomyositis showed a higher degree of pigmentary incontinence (p = .014), suggesting increased and sustained cutaneous inflammation. Periodic acid-Schiff (PAS) stain demonstrated a greater degree of basement membrane thickening (p = .045). Other parameters, including dermal inflammation, dermal mucin deposition and vasculitic/vasculopathic features did not show statistical difference between anti-MDA5 positive and negative dermatomyositis (p > .05). Findings suggest increased cutaneous inflammation for anti-MDA5 dermatomyositis. In skin biopsies, marked pigmentary incontinence or basement membrane thickening should raise suspicion of anti-MDA5 dermatomyositis.

3.
J Cutan Pathol ; 50(3): 201-208, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-36502456

RESUMO

BACKGROUND: Pemphigus is a group of immunobullous dermatoses characterized by the presence of autoantibodies directed against adhesion molecules of keratinocytes, with pemphigus vegetans being the rarest form, accounting for 1%-2% of all cases of pemphigus. Pemphigus vegetans is characterized by verrucous vegetative lesions in addition to vesiculobullous lesions. METHODS: We report a rare case of pemphigus vegetans presenting as an isolated vegetative lesion in the groin 3 months prior to the development of blisters. Owing to the atypical presentation, multiple biopsies were performed before and after corticosteroid treatment. RESULTS: Comparing the histopathology of pre-treatment and post-treatment biopsy specimens, the resolution of intraepidermal microabscesses, and reduction in intraepidermal and dermal inflammatory infiltrates, spongiosis and interface change, attributable to treatment, were noted. However, direct immunofluorescence showed persistent intracellular intraepidermal deposition of IgG and C3 2 weeks into treatment, despite near-complete resolution of blisters on clinical examination. Clinical regression of the vegetative lesion was noted only after 6 weeks into corticosteroid treatment, while histopathological evidence of treatment was apparent at the second week. CONCLUSION: The current case illustrates the importance of a liberal use of immunofluorescence studies in establishing the uncommon yet significant diagnosis of pemphigus vegetans, particularly for vegetative lesions that are persistent, in the intertriginous areas and/or in the setting of concurrent cutaneous or mucosal symptoms.


Assuntos
Pênfigo , Humanos , Pênfigo/patologia , Vesícula/patologia , Pele/patologia , Corticosteroides/uso terapêutico , Biópsia
4.
Nano Lett ; 21(20): 8723-8733, 2021 10 27.
Artigo em Inglês | MEDLINE | ID: mdl-34618470

RESUMO

We present a self-therapeutic nanoparticle for topical delivery to epidermal keratinocytes to prevent and treat psoriasis. Devoid of known chemical or biological antipsoriatic drugs, this sub-15 nm nanoparticle contains a 3 nm gold core and a shell of 1000 Da polyethylene glycol strands modified with 30% octadecyl chains. When it is applied to imiquimod-induced psoriasis mice without an excipient, the nanoparticle can cross the stratum corneum and preferentially enter keratinocytes. Applying the nanoparticles concurrently with imiquimod prevents psoriasis and downregulates genes that are enriched in the downstream of the interleukin-17 signaling pathway and linked to epidermis hyperproliferation and inflammation. Applying the nanoparticles after psoriasis is established treats the psoriatic skin as effectively as standard steroid and vitamin D analog-based therapy but without hair loss and skin wrinkling. The nanoparticles do not accumulate in major organs or induce long-term toxicity. Our nanoparticle offers a simple, safe, and effective alternative for treating psoriasis.


Assuntos
Nanopartículas Metálicas , Nanopartículas , Psoríase , Animais , Modelos Animais de Doenças , Ouro , Imiquimode , Queratinócitos , Camundongos , Psoríase/tratamento farmacológico
5.
J Dermatolog Treat ; 32(1): 29-32, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30280950

RESUMO

BACKGROUND: Epidermolysis Bullosa (EB) is a heterogeneous group of congenital blistering diseases that usually presents in the neonatal period. EB is classified into three major categories, each with many subtypes based on the precise location at which separation or blistering occurs, namely epidermolysis bullosa simplex (EBS), junctional epidermolysis bullosa (JEB) and dystrophic epidermolysis bullosa (DEB). METHODS: We describe genetics of neonatal EB in Hong Kong. RESULTS: Two neonates of consanguineous Pakistani parents had the EB-Pyloric Atresia (EB-PA) variant. One had a 4 kb homozygous deletion of exon 19-25 of the ITGB4 gene, and the other with only a histopathological diagnosis. Both died of sepsis in infancy. Aberrant COL7A1 mutations in the dominant and recessive EB were described. Genetic analysis, together with histopathological classification is important to aid prognosis and counseling. JEB and EB-PA are associated with consanguinity and mortality during infancy. Morbidity and prognosis of the autosomal dominant DEB are optimistic. The autosomal recessive DEB is more severe, with neonatal onset and recurrent blistering. It is also associated with chronicity and malignant changes when the child reaches adulthood. CONCLUSION: Exact genetic diagnosis aids in counseling of the family concerning the prognosis in the affected child and the risk of affected children in future pregnancies.


Assuntos
Colágeno Tipo VII/genética , Epidermólise Bolhosa Distrófica/patologia , Aconselhamento Genético , Epidermólise Bolhosa Distrófica/genética , Epidermólise Bolhosa Juncional/genética , Epidermólise Bolhosa Juncional/patologia , Feminino , Homozigoto , Humanos , Recém-Nascido , Masculino , Gravidez , Deleção de Sequência , Adulto Jovem
6.
Int J Surg Pathol ; 28(4): 440-446, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31747847

RESUMO

A 54-year-old woman presented with abdominal pain. Magnetic resonance imaging revealed an upper vaginal mass with no pelvic side wall involvement, nodal, or distant metastasis. Radical hysterectomy was performed. Histology showed trichoblastic carcinoma with hair follicle structures and malignant sarcomatous and carcinomatous components. Hair follicular differentiation was confirmed by positivity to hair follicle markers (Bcl-2, TLE1, CD56/NCAM, and TDAG51) and presence of CD10-positive trichogenic stroma. The tumor involved the vaginal muscularis only (FIGO [International Federation of Gynecology and Obstetrics] stage I) and was excised with clear margins. The patient remained disease free at 3-month follow-up. This is the first case of cutaneous-type carcinosarcoma reported in the vagina, highlighting the difference in histology, immunophenotype, and behavior compared with gynecologic carcinosarcomas.


Assuntos
Biomarcadores Tumorais/análise , Carcinossarcoma/diagnóstico , Folículo Piloso/patologia , Vagina/patologia , Neoplasias Vaginais/diagnóstico , Biomarcadores Tumorais/metabolismo , Carcinossarcoma/patologia , Carcinossarcoma/cirurgia , Diagnóstico Diferencial , Feminino , Humanos , Histerectomia , Imuno-Histoquímica , Imageamento por Ressonância Magnética , Pessoa de Meia-Idade , Neoplasias Cutâneas/diagnóstico , Vagina/diagnóstico por imagem , Vagina/cirurgia , Neoplasias Vaginais/patologia , Neoplasias Vaginais/cirurgia
7.
ACS Nano ; 13(12): 14048-14069, 2019 12 24.
Artigo em Inglês | MEDLINE | ID: mdl-31725257

RESUMO

Concerns over the health risks associated with airborne exposure to ultrafine particles [PM0.1, or nanoparticles (NPs)] call for a comprehensive understanding in the interactions of inhaled NPs along their respiratory journey. We prepare a collection of polyethylene glycol-coated gold nanoparticles that bear defined functional groups commonly identified in atmospheric particulates (Au@PEG-X NPs, where X = OCH3, COOH, NH2, OH, or C12H25). Regardless of the functional group, these ∼50 nm NPs remain colloidally stable following aerosolization and incubation in bronchoalveolar lavage fluid (BALF), without pronouncedly crossing the air-blood barrier. The type of BALF proteins adhered onto the NPs is similar, but the composition of protein corona depends on functional group. By subjecting Balb/c mice to inhalation of Au@PEG-X NPs for 6 h, we demonstrate that the intrapulmonary distribution of NPs among the various types of cells (both found in BALF and isolated from the lavaged lung) and the acute inflammatory responses induced by inhalation are sensitive to the functional group of NPs and postinhalation period (0, 24, or 48 h). By evaluating the pairwise correlations between the three variables of "lung-nano" interactions (protein corona, intrapulmonary cellular-level distribution, and inflammatory response), we reveal strong statistical correlations between the (1) fractions of albumin or carbonyl reductase bound to NPs, (2) associations of inhaled NPs to neutrophils in BALF or macrophages in the lavaged lung, and (3) level of total protein in BALF. Our results provide insights into the effect of functional group on lung-nano interactions and health risks associated with inhalation of PM0.1.


Assuntos
Inflamação/patologia , Pulmão/patologia , Nanopartículas Metálicas/química , Coroa de Proteína/metabolismo , Administração por Inalação , Animais , Líquido da Lavagem Broncoalveolar/citologia , Coloides/química , Ouro/química , Pulmão/ultraestrutura , Masculino , Nanopartículas Metálicas/ultraestrutura , Camundongos , Camundongos Endogâmicos BALB C , Especificidade de Órgãos , Células RAW 264.7 , Distribuição Tecidual
8.
J Gastroenterol Hepatol ; 34(1): 241-248, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29890010

RESUMO

BACKGROUND AND AIM: The Baveno VI Consensus recommends repeating examination in patients with high liver stiffness measurement (LSM) by transient elastography to reduce false-positive diagnosis of advanced liver disease. We tested whether repeating transient elastography can increase the overall diagnostic accuracy. METHODS: Ninety-seven patients with non-alcoholic fatty liver disease who underwent two FibroScan examinations within 6 months prior to liver biopsy were evaluated. An LSM cut-off of 7.9 kPa was used to exclude F3-4 fibrosis. RESULTS: Seventy-eight patients had high LSM at baseline, among whom 27 had low LSM on repeated testing; only four had F3 and none had cirrhosis. In contrast, 31 of 51 patients with high LSM at both examinations had F3-4. Nineteen patients had low LSM at baseline; none of them had F3-4 regardless of the second LSM results. If we took LSM <7.9 kPa at either examination as sufficient to exclude F3-4, the negative predictive value remained high at 91%. The positive predictive value for F3-4 increased from 45% in patients with high LSM at baseline to 61% in those with high LSM at both examinations. Sensitivity analysis using different cut-offs yielded similar results, with 76% of patients with LSM >12 kPa at both examinations having F3-4. CONCLUSIONS: Transient elastography is a highly sensitive screening test to exclude F3-4 fibrosis in non-alcoholic fatty liver disease patients. One-third of patients with high LSM may have normal results on repeated examination. By repeating examination in cases with high LSM, one may spare patients from unnecessary liver biopsy.


Assuntos
Elasticidade , Cirrose Hepática/diagnóstico por imagem , Cirrose Hepática/fisiopatologia , Hepatopatia Gordurosa não Alcoólica/diagnóstico por imagem , Idoso , Técnicas de Imagem por Elasticidade , Reações Falso-Positivas , Feminino , Humanos , Cirrose Hepática/etiologia , Masculino , Pessoa de Meia-Idade , Hepatopatia Gordurosa não Alcoólica/complicações , Valor Preditivo dos Testes , Reprodutibilidade dos Testes
9.
Pathology ; 51(1): 67-73, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30502217

RESUMO

Malignant transformation of benign mature ovarian teratoma can result in a wide spectrum of cancer, including a variety of carcinoma, sarcoma, or melanoma. The role of mismatch repair defects in such malignant transformation is still elusive. In view of current immunotherapy, the role of mismatch repair deficiency can have significant implications on therapeutic strategy. Thus, we aimed to investigate the possible involvement of mismatch repair deficiency in somatic-type carcinoma arising from teratoma. We examined seven cases of malignant transformation of ovarian teratoma to carcinoma from the years 2000-2017. Mismatch repair deficiency was demonstrated in two cases, one of which was a squamous carcinoma and another a sebaceous carcinoma. By immunohistochemistry and molecular studies, we detected mismatch repair protein deficiency, microsatellite instability (MSI) and MLH1 promoter methylation in the derived carcinoma, but not in the benign teratoma, indicating mismatch repair deficiency was implicated in the process of malignant transformation. Our findings expand the spectrum of genetic alterations which are known to accompany malignant changes in benign teratoma. This finding is also of potential therapeutic significance, as mismatch repair deficient tumours can often be responsive to immune checkpoint blockade because of the high mutational load. In conclusion, we report that a subset of teratoma-derived carcinoma harbours MLH1 promoter methylation which underlies DNA mismatch repair deficiency, and this subset of patients has the potential to benefit from immunotherapy.


Assuntos
Adenocarcinoma Sebáceo/genética , Neoplasias Encefálicas/genética , Carcinoma de Células Escamosas/genética , Transformação Celular Neoplásica/genética , Neoplasias Colorretais/genética , Reparo de Erro de Pareamento de DNA , Síndromes Neoplásicas Hereditárias/genética , Neoplasias Ovarianas/genética , Teratoma/genética , Adenocarcinoma Sebáceo/patologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Neoplasias Encefálicas/patologia , Carcinoma de Células Escamosas/patologia , Transformação Celular Neoplásica/patologia , Neoplasias Colorretais/patologia , Feminino , Humanos , Instabilidade de Microssatélites , Pessoa de Meia-Idade , Síndromes Neoplásicas Hereditárias/patologia , Neoplasias Ovarianas/patologia , Regiões Promotoras Genéticas , Teratoma/patologia
10.
J Gastroenterol Hepatol ; 32(7): 1363-1369, 2017 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-27936280

RESUMO

BACKGROUND AND AIM: The FibroMeter vibration-controlled transient elastography (FM VCTE) is a new formula combining the serum test FM and liver stiffness measurement (LSM) by VCTE. We tested the accuracy and utility of FM VCTE for fibrosis staging in patients with non-alcoholic fatty liver disease (NAFLD). METHODS: Two hundred fifteen NAFLD patients with LSM, FM NAFLD, FM VCTE, and other serum tests (aspartate aminotransferase-to-platelet ratio index, fibrosis-4 index, BARD score, NAFLD fibrosis score, and aspartate aminotransferase-to-alanine aminotransferase ratio) performed 1 day before liver biopsy were evaluated. RESULTS: Sixty-nine (32.1%) and 43 (20.0%) patients had F2-4 and F3-4, respectively. LSM had higher diagnostic accuracy (area under receiver-operating characteristics curves [AUROC] 0.851 for F2-4, 0.940 for F3-4; Obuchowski index 0.937 ± 0.007) than all evaluated serum tests, while FM NAFLD was the most accurate serum test (AUROC 0.775 and 0.774; Obuchowski index 0.891 ± 0.013). FM VCTE had similar accuracy to LSM (AUROC 0.855 and 0.901; Obuchowski index 0.927 ± 0.009). LSM had excellent negative predictive values of 92.4% and 99.2% to exclude F2-4 and F3-4, but the positive predictive values (PPV) were only 71.4% and 61.0%, respectively. In patients with high LSM, the use of FM VCTE improved the PPV from 71.4% to 84.4% for F2-4 and from 61.0% to 88.9% for F3-4. Liver biopsy could be spared in around 50-65% of patients. CONCLUSIONS: Liver stiffness measurement alone can confidently exclude significant and advanced fibrosis in NAFLD patients. Using FM VCTE in patients with high liver stiffness can increase the positive predictive value to rule in F2-4 and F3-4.


Assuntos
Técnicas de Imagem por Elasticidade/métodos , Fígado/diagnóstico por imagem , Hepatopatia Gordurosa não Alcoólica/diagnóstico por imagem , Vibração , Adulto , Algoritmos , Povo Asiático , Aspartato Aminotransferases/sangue , Biomarcadores/sangue , Elasticidade , Feminino , Fibrose , Humanos , Fígado/patologia , Masculino , Pessoa de Meia-Idade , Hepatopatia Gordurosa não Alcoólica/diagnóstico , Hepatopatia Gordurosa não Alcoólica/patologia , Contagem de Plaquetas , Valor Preditivo dos Testes , Sensibilidade e Especificidade , Índice de Gravidade de Doença
11.
Hepatology ; 65(1): 54-64, 2017 01.
Artigo em Inglês | MEDLINE | ID: mdl-27339817

RESUMO

Although nonalcoholic fatty liver disease (NAFLD) is closely linked to obesity, around 10%-20% of nonobese Americans and Asians still develop NAFLD. Data on this special group are limited. We therefore studied the severity and clinical outcomes of nonobese NAFLD patients. Consecutive NAFLD patients who underwent liver biopsy were prospectively recruited. We used the NASH Clinical Research Network system to score the histology. The Asian body mass index cutoff of 25 kg/m2 was used to define nonobese NAFLD. Among 307 recruited NAFLD patients, 72 (23.5%) were nonobese. Compared to obese patients, nonobese patients had lower NAFLD activity score (3.3 ± 1.3 vs. 3.8 ± 1.2; P = 0.019), mainly contributed by steatosis (1.7 ± 0.8 vs. 2.0 ± 0.8; P = 0.014) and presence of hepatocyte ballooning (60.9% vs. 73.4%; P = 0.045). Similarly, nonobese patients had lower fibrosis stage (1.3 ± 1.5 vs. 1.7 ± 1.4; P = 0.004), serum cytokeratin-18 fragments (283 vs. 404 U/L; P < 0.001) and liver stiffness measurement by transient elastography (6.3 vs. 8.6 kilopascals; P < 0.001). By multivariate analysis in nonobese patients, only elevated serum triglyceride level was independently associated with higher NAFLD activity score (adjusted odds ratio [OR], 1.644; P = 0.021), whereas elevated creatinine level was the only factor associated with advanced fibrosis (adjusted OR, 1.044; P = 0.025). After a median follow-up of 49 months, 6 patients died, 2 developed hepatocellular carcinoma, and 1 had liver failure, all of whom were in the obese group. CONCLUSION: Nonobese NAFLD patients tend to have less-severe disease and may have a better prognosis than obese patients. Hypertriglyceridemia and higher creatinine are the key factors associated with advanced liver disease in nonobese patients. (Hepatology 2017;65:54-64).


Assuntos
Hepatopatia Gordurosa não Alcoólica/patologia , Biópsia , Feminino , Humanos , Fígado/patologia , Masculino , Pessoa de Meia-Idade , Hepatopatia Gordurosa não Alcoólica/complicações , Obesidade/complicações , Prognóstico , Estudos Prospectivos , Índice de Gravidade de Doença
12.
J Gastroenterol Hepatol ; 31(4): 848-55, 2016 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-26514665

RESUMO

BACKGROUND AND AIM: Controlled attenuation parameter (CAP) evaluated with transient elastography (FibroScan) is a recent method for non-invasive assessment of steatosis. Its usefulness in non-alcoholic fatty liver disease (NAFLD) is unknown. We prospectively investigated the performance of CAP for the diagnosis of steatosis in NAFLD, factors associated with discordances between CAP and steatosis grades, and relationships between CAP and clinical or biological parameters. METHODS: All CAP examinations performed in NAFLD patients with a liver biopsy performed within 1 week of CAP measurement were included. Liver biopsies were assessed for activity and fibrosis stage, NAFLD activity score, and steatosis graded as follows: S0, steatosis < 5%; S1, 5-33%; S2, 34-66%; S3, >66%. RESULTS: Two hundred sixty-one patients (59% male, age 56 years) from two ethnic groups were included. No patient had steatosis < 5%. The area under the receiver-operating characteristics curve of CAP for steatosis ≥S2 and S3 was 0.80 and 0.66, respectively. At a cut-off value of 310 dB/m, the sensitivity, specificity, and positive and negative predictive values for ≥S2 steatosis were 79%, 71%, 86%, and 71%, respectively. Discordance of at least one grade between CAP and steatosis was observed in 81 patients. By multivariate analysis, only steatosis S2S3 was associated with no discordance. By multivariate analysis, only BMI ≥ 30 kg/m(2) was significantly associated with CAP > 310 dB/m. CONCLUSION: The association of CAP with steatosis, especially in patients with non-alcoholic steatohepatitis, and with elevated BMI could be useful for the diagnosis and follow-up of NAFLD patients.


Assuntos
Técnicas de Imagem por Elasticidade/métodos , Fígado Gorduroso/diagnóstico por imagem , Fígado/diagnóstico por imagem , Hepatopatia Gordurosa não Alcoólica/diagnóstico por imagem , Adulto , Idoso , Biópsia , Índice de Massa Corporal , Fígado Gorduroso/patologia , Feminino , Humanos , Fígado/patologia , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Hepatopatia Gordurosa não Alcoólica/patologia , Valor Preditivo dos Testes , Estudos Prospectivos , Sensibilidade e Especificidade
13.
J Gastroenterol Hepatol ; 30(6): 1040-8, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25639146

RESUMO

BACKGROUND/AIMS: Interleukin-28B (IL28B) and patatin-like phospholipase domain containing 3 (PNPLA3) gene polymorphisms are associated with hepatitis C virus (HCV) clearance and fatty liver, respectively. We aimed to test if their polymorphisms are associated with virologic responses in Chinese chronic hepatitis C (CHC) patients. METHODS: This was a retrospective-prospective cohort study. Consecutive patients infected by genotype 1 and 6 HCV received antiviral therapy were included. Host IL-28B rs12979860/rs8099917 and PNPLA3 rs738409 genotype were tested. The primary outcome was sustained virologic response (sustained virologic response [SVR]: undetectable HCV RNA 24 weeks post-treatment). RESULTS: From 305 patients had positive antibody to HCV, 52 and 31 patients infected by genotype 1 and 6 HCV, respectively were recruited. Mean age was 58 ± 11 years; 70% were male. Mean baseline HCV RNA was 6.8 ± 2.7 log IU/ml. The SVR for patients infected by genotype 1 and 6 HCV was 67.3% and 90.3%, respectively. The proportions of IL28B genotypes were 78%, 21%, and 1% for TT/TG/GG at rs8099917, and 81%, 18%, and 1% for CC/TC/TT at rs12979860, respectively. The proportions of PNPLA3 rs738409 genotypes were 16%, 36%, and 48% for GG/GC/CC. IL28B genotype was significantly associated with SVR in patients infected by genotype 1 but not genotype 6 HCV, with 80% versus 38% of patients infected by genotype 1 achieved SVR carried TT versus TG/GG at rs8099917, respectively (P=0.003). PNPLA3 genotype was not associated with SVR. CONCLUSIONS: IL28B gene with rs8099917 T allele as an independent predictor of SVR in Chinese CHC patients infected by genotype 1 but not genotype 6 HCV.


Assuntos
Antivirais/uso terapêutico , Estudos de Associação Genética , Genótipo , Hepacivirus/genética , Hepatite C/genética , Hepatite C/virologia , Interleucinas/genética , Lipase/genética , Proteínas de Membrana/genética , Polimorfismo Genético/genética , Adulto , Idoso , Alelos , Povo Asiático , Estudos de Coortes , Feminino , Hepatite C/tratamento farmacológico , Humanos , Interferons , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Estudos Retrospectivos , Resultado do Tratamento
14.
Clin Gastroenterol Hepatol ; 12(10): 1759-62.e1, 2014 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-24534547

RESUMO

Abuse of ketamine leads to liver injury. We investigated the histopathologic and radiologic features of ketamine abusers with significant liver injury in a cross-sectional survey of 297 consecutive chronic abusers of ketamine with urinary tract dysfunction. Liver biopsy and magnetic resonance cholangiopancreatography were performed in patients with liver injury (concentrations of bilirubin, alkaline phosphatase, and/or alanine aminotransferase >2-fold the upper limit of normal). The prevalence of liver injury was 9.8% (all cases cholestatic). Bile duct injury was observed in all 7 patients assessed by liver biopsy. Two patients had bridging fibrosis despite their young age. Three of 6 patients who underwent magnetic resonance cholangiopancreatography examination were found to have prominent or dilated common bile ducts without obstructions or extrinsic compressions. Ketamine abuse therefore appears to lead to common bile duct dilatation, microscopic bile duct injury, and even significant liver fibrosis.


Assuntos
Doença Hepática Induzida por Substâncias e Drogas/epidemiologia , Ketamina/efeitos adversos , Transtornos Relacionados ao Uso de Substâncias/complicações , Adulto , Ductos Biliares/patologia , Biópsia , Colangiopancreatografia por Ressonância Magnética , Estudos Transversais , Feminino , Histocitoquímica , Humanos , Fígado/diagnóstico por imagem , Fígado/patologia , Masculino , Prevalência , Radiografia , Adulto Jovem
15.
Radiology ; 269(3): 910-8, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23912619

RESUMO

PURPOSE: To document utility of shear-wave (SW) elastography for assessing liver fibrosis in chronic hepatitis B and to compare its performance with that of transient elastography. MATERIALS AND METHODS: Ethics committee approved the study, and informed consent was obtained. Patients with liver biopsy correlation (n = 226) and healthy patients (n = 171) were analyzed. Results of SW elastography of liver, SW elastography of spleen, and transient elastography of liver were compared and correlated according to METAVIR scores. Areas under the receiver operating characteristic curve (AUCs), binary logistic regression, and Delong test were used. RESULTS: AUC for SW elastography of liver, transient elastography of liver, and SW elastography of spleen was, respectively, 0.86, 0.80, and 0.81 for fibrosis (≥ F1 stage); 0.88, 0.78, and 0.82 for moderate fibrosis (≥ F2 stage); 0.93, 0.83, and 0.83 for severe fibrosis (≥ F3 stage); and 0.98, 0.92, and 0.84 for cirrhosis (F4 stage). SW elastography of liver showed significantly higher accuracy than transient elastography of liver and SW elastography of spleen in all fibrosis stages (P = .01-.04). SW elastography of spleen showed similar accuracy with transient elastography of liver (P = .21-.99). Combination SW elastography of liver and SW elastography of spleen to predict fibrosis staging showed diagnostic accuracy not further improved compared with SW elastography of liver alone (similar AUC; ≥ F1, P = .87; ≥ F2, P = .81; ≥ F3, P = .84; ≥ F4, P = .88). SW elastography of liver had higher successful rate than transient elastography of liver (98.9% vs 89.6%). Prevalence of discordance in at least two stages with liver histologic staging was 10.2% (23 of 226) for SW elastography of liver and 28.2% (58 of 206) for SW elastography of spleen. CONCLUSION: SW elastography provides more accurate correlation of liver elasticity with liver fibrosis stage compared with transient elastography, especially in identification of stage F2 or greater.


Assuntos
Técnicas de Imagem por Elasticidade/métodos , Hepatite B Crônica/diagnóstico por imagem , Cirrose Hepática/diagnóstico por imagem , Baço/diagnóstico por imagem , Adulto , Biópsia , Estudos de Casos e Controles , Feminino , Hepatite B Crônica/patologia , Humanos , Cirrose Hepática/patologia , Testes de Função Hepática , Masculino , Pessoa de Meia-Idade , Baço/patologia
16.
Ann Hepatol ; 12(4): 570-80, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23813135

RESUMO

UNLABELLED: BACKGROUND AND RATIONALE FOR THE STUDY: Limited studies have aimed to define the cut-offs of XL probe (XL cut-offs) for different stages of liver fibrosis, whereas those of M probe (M cut-offs) may not be applicable to XL probe. We aimed to derive appropriate XL cut-offs in overweight patients. Patients with liver stiffness measurement (LSM) by both probes were recruited. XL cut-offs probe for corresponding M cut-offs were derived from an exploratory cohort, and subsequently validated in a subgroup patients also underwent liver biopsy. The diagnostic accuracy of XL cut-offs to diagnose advanced fibrosis was evaluated. RESULTS: Total 517 patients (63% male, mean age 58) who had reliable LSM by both probes were included in the exploratory cohort. There was a strong correlation between the LSM by M probe (LSM-M) and LSM by XL probe (LSM-XL) (r² = 0.89, p < 0.001). A decision tree using LSM-XL was learnt to predict the 3 categories of LSM-M (< 6.0kPa, 6.0-11.9kPa and ≥ 12.0kPa), and XL cut-offs at 4.8kPa and 10.7kPa were identified. These cut-offs were subsequently validated in a cohort of 147 patients who underwent liver biopsy. The overall accuracy was 89% among 62 patients whose LSM-XL < 4.8kPa or ≥ 10.7kPa. These cut-offs would have avoided under-staging of fibrosis among patients with body mass index (BMI) > 25-30 kg/m2 but not > 30 kg/m2. CONCLUSIONS: XL cut-offs at 4.8kPa and 10.7kPa were the best estimates of 6.0kPa and 12.0kPa of M probe for patients with BMI > 25-30 kg/m2. Patients with BMI > 30 kg/m² might use M probe cut-offs for XL probe.


Assuntos
Técnicas de Imagem por Elasticidade/instrumentação , Cirrose Hepática/diagnóstico por imagem , Fígado/diagnóstico por imagem , Adulto , Idoso , Algoritmos , Biópsia , Calibragem , Técnicas de Apoio para a Decisão , Árvores de Decisões , Módulo de Elasticidade , Técnicas de Imagem por Elasticidade/métodos , Técnicas de Imagem por Elasticidade/normas , Desenho de Equipamento , Feminino , França , Hong Kong , Humanos , Modelos Lineares , Fígado/patologia , Cirrose Hepática/complicações , Cirrose Hepática/patologia , Masculino , Pessoa de Meia-Idade , Obesidade/complicações , Valor Preditivo dos Testes , Estudos Prospectivos , Reprodutibilidade dos Testes
17.
Clin Gastroenterol Hepatol ; 11(3): 295-302.e1-3, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23022698

RESUMO

BACKGROUND & AIMS: We investigated the association between anthropometric parameters and results of liver stiffness measurements (LSMs) by transient elastography in healthy subjects and patients with nonalcoholic fatty liver disease (NAFLD). METHODS: We analyzed anthropometric and LSM data from 658 healthy subjects (37% male; mean age, 47 ± 11 years; body mass index [BMI], 21.8 ± 3.0 kg/m(2); LSM, 4.4 ± 1.6 kPa) and 247 patients with biopsy-proven NAFLD (50% male; mean age, 48 ± 11 years; BMI, 28.6 ± 6.5 kg/m(2); LSM, 9.6 ± 8.7 kPa). Healthy subjects were defined as individuals without viral hepatitis, alcoholic liver disease, or NAFLD. We investigated associations between anthropometric parameters, including BMI and waist circumference, and LSM. RESULTS: LSMs were slightly higher among healthy subjects with BMIs ≤ 18.5 kg/m(2) (n = 84, 4.8 ± 1.5 kPa) and BMIs of 25-29.9 kg/m(2) (n = 76, 5.3 ± 2.2 kPa) than those with BMIs of 18.5-24.9 kg/m(2) (n = 492, 4.5 ± 1.9 kPa; P = .16 by analysis of variance). Among patients with NAFLD of Brunt fibrosis stage 0 or 1, LSMs were lowest among those with BMIs of 18.5-24.9 kg/m(2) (stage 0: n = 34, 5.5 ± 2.2 kPa; stage 1: n = 18, 7.2 ± 3.8 kPa). LSMs were higher among those with BMIs of 25-29.9 kg/m(2) (stage 0: n = 41, 6.1 ± 1.3 kPa; stage 1: n = 26, 7.9 ± 3.5 kPa) and highest for those with BMIs ≥30 kg/m(2) (stage 0: n = 13, 8.5 ± 2.2 kPa; stage 1: n = 22, 11.7 ± 5.2 kPa) (P < .001 and P = .002, respectively, by analysis of variance). High BMI was independently associated with high LSM, in addition to fibrosis stage, among patients with NAFLD. Patients with different waist circumferences had comparable LSMs. CONCLUSIONS: BMI ≥30 kg/m(2) is associated with higher LSMs in patients with NAFLD, after adjusting for fibrosis stage.


Assuntos
Antropometria , Técnicas de Imagem por Elasticidade , Fígado Gorduroso/patologia , Cirrose Hepática/patologia , Fígado/anatomia & histologia , Fígado/patologia , Adulto , Idoso , Fígado Gorduroso/diagnóstico , Feminino , Experimentação Humana , Humanos , Fígado/diagnóstico por imagem , Cirrose Hepática/diagnóstico , Cirrose Hepática/diagnóstico por imagem , Masculino , Pessoa de Meia-Idade , Hepatopatia Gordurosa não Alcoólica
18.
J Gastroenterol Hepatol ; 28(1): 57-62, 2013 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-23034128

RESUMO

BACKGROUND AND AIMS: Non-alcoholic steatohepatitis (NASH) is a common liver disease that may progress to cirrhosis and hepatocellular carcinoma. There is currently no approved pharmacological treatment for NASH. Phyllanthus urinaria is a commonly used hepatoprotective herb that ameliorates NASH in animal studies. We aimed to test the hypothesis that Phyllanthus was superior to placebo in improving histological non-alcoholic fatty liver disease (NAFLD) activity score. METHODS: This was a placebo-controlled parallel-group double-blind randomized controlled trial. Patients with histology-proven NASH were randomized to receive Phyllanthus or placebo for 24 weeks. The primary endpoint was change in NAFLD activity score from baseline to week 24. Secondary endpoints included changes in individual histological parameters, liver biochemistry and metabolic profile. RESULTS: We enrolled 60 patients (40 received Phyllanthus and 20 received placebo). The change in NAFLD activity score was -0.8 ± 1.4 in the Phyllanthus group and -0.3 ± 1.3 in the placebo group (P = 0.24). The change in steatosis, lobular inflammation, ballooning and fibrosis was also similar between the two groups. Within the Phyllanthus group, although there was reduction in hepatic steatosis (-0.2 ± 0.7; P = 0.039) and ballooning grades (-0.4 ± 0.5; P < 0.001), the change was small and of limited clinical significance. Furthermore, there was no significant difference in the changes in alanine aminotransferase, aspartate aminotransferase, fasting glucose and lipid profile between the two groups. CONCLUSIONS: Phyllanthus is not superior to placebo in improving NAFLD activity score in NASH patients.


Assuntos
Fígado Gorduroso/tratamento farmacológico , Fígado Gorduroso/patologia , Phyllanthus , Fitoterapia , Preparações de Plantas/uso terapêutico , Adulto , Alanina Transaminase/sangue , Aspartato Aminotransferases/sangue , LDL-Colesterol/sangue , Método Duplo-Cego , Fígado Gorduroso/sangue , Feminino , Teste de Tolerância a Glucose , Humanos , Masculino , Pessoa de Meia-Idade , Hepatopatia Gordurosa não Alcoólica , Preparações de Plantas/efeitos adversos , Índice de Gravidade de Doença , Estatísticas não Paramétricas
19.
Am J Gastroenterol ; 107(12): 1862-71, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23032979

RESUMO

OBJECTIVES: Liver stiffness measurement (LSM) by transient elastography is a noninvasive test of liver fibrosis, but cannot be performed in a significant proportion of obese patients. The aim of this study was to evaluate the performance of the new XL probe in patients with nonalcoholic fatty liver disease (NAFLD). METHODS: Liver biopsy and paired LSM by both the original M probe and XL probe were performed on 193 consecutive NAFLD patients in France and Hong Kong. RESULTS: Compared with M probe, XL probe was more likely to achieve 10 valid measurements (95% vs. 81%; P<0.001) and a success rate of over 60% (90% vs. 74%; P<0.001). The areas under receiver operating characteristics curves of XL probe for F2, F3, and F4 disease were 0.80, 0.85, and 0.91, respectively. XL probe tended to generate lower LSM than M probe in the same patient. At a cutoff of 7.2 kPa, the sensitivity, specificity, positive, and negative predictive values for F3 or greater disease were 78%, 78%, 60%, and 89%, respectively. Discordance of at least two stages between XL probe and histology was observed in 16 (9%) patients. Body mass index (BMI) over 35 kg/m(2) was independently associated with discordance (adjusted odds ratio 9.09; 95% confidence interval 1.10-75.43). Reliable measurements by XL probe were obtained in 75% of the overall population and 65% of patients with BMI over 30 kg/m(2). CONCLUSIONS: LSM by XL probe can be performed successfully in most NAFLD patients, but obesity is associated with less accurate and reliable measurements.


Assuntos
Biópsia , Técnicas de Imagem por Elasticidade/instrumentação , Fígado Gorduroso/patologia , Cirrose Hepática/patologia , Adulto , Idoso , Área Sob a Curva , Índice de Massa Corporal , Fígado Gorduroso/fisiopatologia , Feminino , França , Hong Kong , Humanos , Cirrose Hepática/fisiopatologia , Masculino , Pessoa de Meia-Idade , Hepatopatia Gordurosa não Alcoólica , Razão de Chances , Valor Preditivo dos Testes , Estudos Prospectivos , Curva ROC , Reprodutibilidade dos Testes , Sensibilidade e Especificidade
20.
J Hepatol ; 56(6): 1363-70, 2012 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22314419

RESUMO

BACKGROUND & AIMS: The diagnosis of non-alcoholic fatty liver disease (NAFLD) and steatohepatitis (NASH) is limited by the need for liver biopsy. We aimed at testing the accuracy of cytokeratin-18 fragment (CK-18), adipocyte fatty acid binding protein (AFABP) and fibroblast growth factor 21 (FGF21) for the diagnosis of NAFLD and NASH. METHODS: 146 patients with biopsy-proven NAFLD and 74 age- and gender-matched healthy controls were included. Serum CK-18, AFABP and FGF21 levels were determined by enzyme-linked immunosorbent assay. RESULTS: Serum CK-18, AFABP, and FGF21 increased in a stepwise fashion in control subjects (median 103 U/L, 15.4 ng/ml, and 104 pg/ml), patients with non-NASH NAFLD (263 U/L, 18.9 ng/ml, and 249 pg/ml) and NASH (418 U/L, 19.4 ng/ml, and 354 pg/ml) (p<0.001, 0.060, and 0.016, respectively). The area under receiver-operating characteristics curve to diagnose NAFLD and NASH was 0.91 and 0.70 for CK-18, 0.66 and 0.59 for AFABP, and 0.84 and 0.62 for FGF21. At cut-offs of 203 and 670 U/L, CK-18 had 71% negative predictive value (NPV) and 77% positive predictive value (PPV) to exclude and diagnose NASH. A 2-step approach measuring CK-18 followed by FGF21 further improved the NPV to 74% and PPV to 82%. In a validation cohort of 51 patients with paired liver biopsies, the NPV and PPV of the 2-step approach were 67% and 78%, respectively. CONCLUSIONS: CK-18 is the most accurate biomarker for NAFLD and NASH. A two-step approach using CK-18 and FGF21 further improves the accuracy in diagnosing NASH.


Assuntos
Fígado Gorduroso/diagnóstico , Fatores de Crescimento de Fibroblastos/sangue , Queratina-18/sangue , Adulto , Biomarcadores/sangue , Proteínas de Ligação a Ácido Graxo/sangue , Fígado Gorduroso/sangue , Feminino , Humanos , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Hepatopatia Gordurosa não Alcoólica
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