Assessment of liver disease by non-invasive methods in perinatally infected Brazilian adolescents and young adults living with Human Immunodeficiency Virus (HIV)

ABSTRACT

Introduction:

Effective and long-term combined antiretroviral therapy (cART) has decreased morbidity and mortality in HIV-infected individuals. Despite treatment advances, HIV-infected children continue to develop noninfectious conditions, including liver fibrosis.

Methods:

Cross-sectional study designed to identify liver fibrosis in HIV-infected adolescents and young adults, in an outpatients clinic of Pediatric Infectious Diseases Division at Escola Paulista de Medicina/Universidade Federal de São Paulo (UNIFESP), diagnosed by noninvasive methods (liver elastography–FibroScan®, APRI and FIB4). Variables examined included demographics, clinical, laboratories, HIV treatment. All participants underwent FibroScan® to measure liver parenchyma elasticity. Values equal to above 7.0 kPa were interpreted as the presence of significant liver fibrosis. Two different biomarkers of liver fibrosis were employed: the AST-to-Platelet Ratio Index (APRI) and the Fibrosis-4 score (FIB-4). APRI values above 1.5 have been considered as levels of clinically significant liver fibrosis and FIB-4 values above 3.25 suggested the presence of advanced fibrosis.

Results:

Between August 2014 and March 2017, the study enrolled 97 patients, age 10–27 years old, fourteen of 97 subjects (14.4%) presented liver stiffness (≥7 kPa) detected by the liver elastography. No patient had APRI> 1.5. No patient had FIB4 value > 3.25. The only isolated laboratory parameter that could be significantly associated with high liver stiffness was thrombocytopenia (p = 0.022, Fisher's exact test).

Conclusion:

Liver stiffness was identified in 14.4% (14/97) of this cohort by liver elastography. Liver disease in HIV-infected adolescents and young adults manifests itself silently, so should be routinely investigated.

Keywords:
HIV; AIDS; Adolescents; Liver stiffness; Hepatic fibrosis; Transient hepatic elastography; Vertical transmission

Introduction

The introduction of effective Combined Antiretroviral Therapy (cART) significantly reduced morbidity and mortality of human immunodeficiency virus (HIV)-infected patients.¹ However non-infectious complications, including liver disease, have become significant causes of long-term morbidity and mortality in HIV-infected patients.²

Liver disease is serious and potentially fatal in HIV coinfected and in HIV-monoinfected patients and can occur in a variety of ways. There are direct and indirect mechanisms that may contribute to the progression of liver disease. HIV causes direct cytopathic effects in the liver cells.³ Indirectly, long-term antiretroviral use like nucleoside analog reverse transcriptase inhibitors, long-term inflammation and metabolic complications may also contribute to the pathogenesis of liver disease.⁴

Liver disease can be silent and symptoms typically arise in advanced stages, as described in some adolescents exposed long-term to didanosine (ddI).^5–7 Liver fibrosis, one of the hepatic complications of HIV infection, was previously associated with the following factors in adults: splenomegaly, prolonged use of didanosine (ddI), thrombocytopenia, elevation of serum aminotransferase and alkaline phosphatase.⁸

An unexplained hepatic fibrosis with noncirrhotic portal hypertension in an adolescent without viral hepatitis co-infection was identified in our cohort of perinatally HIV-infected patients.⁹ This event triggered the prospective investigation of liver disease in our patients. The aim of this study was to assess liver fibrosis by non-invasive methods in a cohort of perinatally HIV-infected adolescents and young adults. Detecting potential, subclinical liver disease in this population is important not only to prevent complications, but also to plan therapeutic antiretroviral management.

Methods

This was a cross-sectional study designed to assess liver diseases in a cohort of perinatally HIV-infected adolescents and young adults using noninvasive methods. Between August 2014 and March 2017, all 115 patients followed at the Pediatric Infectious Diseases Division at Escola Paulista de Medicina/Universidade Federal de São Paulo (UNIFESP) were invited to participate in the study. Only perinatally HIV-infected patients were included and those with hepatitis B or C, alcohol consumption, drug-abuse, use of estrogens, hepatotoxic drugs and other viral hepatitis were excluded. Nine subjects declined, one was excluded due to hepatitis C co-infection and eight were not perinatally HIV-infected. Ninety-seven patients were enrolled in this study.

Demographic and laboratorial parameters

Variables examined included age, sex, race, pediatric AIDS classification,¹⁰ weight, height, body mass index (BMI),¹¹ date of HIV infection diagnosis, presence of hepatosplenomegaly, exposure time to cART, exposure time to ddI, HIV viral load, current and nadir CD4+ T cell count, current CD8+T cell count, current CD4/CD8 ratio, and laboratory variables (platelets count, serum alanine aminotransferase–ALT, aspartate aminotransferase–AST, gamma-glutamyltransferase–GGT, Alkaline Phosphatase–AP, glycemia, insulin, triglycerides, and total cholesterol). Clinical and laboratory parameters were collected from the patients’ medical records. Laboratorial parameters, when not available at enrollment, results of samples collected within three months were used.

Transient hepatic elastography (THE)

THE examination was performed by an experienced investigator in all subjects at study entry at the Hepatology Branch of the Division of Gastroenterology at Escola Paulista de Medicina/UNIFESP, using a FibroScan 502 equipment (EchoSens, Paris, France). Measurements were performed using the standard technique, as previously described in some studies.^13–16 Only patients with at least 10 valid measurements in the same THE procedure, with an interquartile range of less than 30% of the median stiffness, and with at least 60% success rate were included in the final analysis.¹²

According to previous studies, THE values equal or above 7.0 kPa were interpreted as the presence of significant liver stiffness, which corresponds to septal fibrosis, and values above 12.5 kPa indicated the presence of cirrhosis.¹² The diagnostic performance of THE was confirmed by several meta-analyses that confirm its excellent diagnostic accuracy for cirrhosis of (>90%).^13–16

Non-invasive serum biomarkers

Two different biomarkers of liver fibrosis were employed: the AST-to-Platelet Ratio Index (APRI) and the Fibrosis-4 score (FIB-4). The APRI was calculated according to the formula: $\left[\left(\mathrm{current}\mathrm{AST}\left[U/L\right]/\mathrm{Normal}\mathrm{AST}\left[U/L\right.\right)/\left(\mathrm{Platelet}\mathrm{count}x{10}^9/L\right)\right]x100$.¹⁷ The FIB-4 was calculated using the formula: $\mathrm{age}\left(\mathrm{years}\right)x\mathrm{AST}\left[U/L\right]/\left(\mathrm{platelets}\left[{10}^9/L\right]x{\left(\mathrm{ALT}\left[U/L\right]\right)}^{1/2}\right)$.¹⁸

Patients with APRI values above 1.5 have been considered with clinically significant liver fibrosis (at least septal fibrosis)¹⁷ and FIB-4 values above 3.25 suggested the presence of advanced fibrosis.¹⁹

Statistical analysis

Initially the data were analyzed descriptively. Absolute and relative frequencies were used for the categorical variables and for the numerical variables, summary-measures (mean, median, minimum, maximum, and standard deviation).

The associations between two categorical variables were verified using the Chi-Square test, or alternatively Fisher's exact test in cases of small samples. The comparison of the medians between two groups was performed using the non-parametric Mann–Whitney test due to violation of the assumption of normal distribution in the variables.

Ethics

This study was approved by the Institutional Review Board (IRB) of UNIFESP. Written informed consent was obtained from the parents or legal guardian and patients older than 18 years old. Consent was obtained from adolescents younger than 18 years old.

Results

Most of the patients were female 60/97 (61.9%), white 64/97 (66.0%), aged between 10 and 27 years old with median age of 18.6 years and 85/97 (87.6%) were clinically categorized as B and C and 83/97 (85.6%) immunologically as 2 and 3 of the pediatric AIDS classification CDC1994. Half of them had undetectable HIV viral load at enrollment in the study. In spite of the median current CD4+ T cell count within normal levels, these patients had very low CD4+ T cells nadir. The majority of subjects were on cART for many years (Table 1). Only 2.1% (2/97) were not on cART at inclusion in this study. 52.6% (51/97) were exposed to ddI for five years or more.

Table 1
Main demographic, virologic, immunological and therapeutic characteristics of patients with and without elevated liver stiffness (LS) assessed by transient hepatic elastography (THE).

Variables	Liver stiffness < 7 kPa	Liver stiffness ≥ 7 kPa	p-value
	n = 83	n = 14
AGE years, median (min-max)	18.4 (10.4-27.8)	19.2 (13.6-23.9)	0.926
BMI kg/m2, median (min-max)	20.6 (12.1-36.9)	20.8 (14.3-26.5)	0.980
TIME OF cART TREATMENT years, median (min-max)	15.7 (0.0-21.6)	15.5 (0.0-21.3)	0.967
TIME OF EXPOSURE TO ddI, years (min-max)	5.6 (0.0-15.0)	4.1 (0.0-12.0)	0.478
USE OF ddI, n (%)	68/83 (81.9)	11/14 (78.6)	0.996
UNDETECTABLE HIV VIRAL LOAD, n (%)	44 (53.0)	5 (35.7)	0.231
NADIR CD4+T cells/mm3, median (min-max)	276 (1-1092)	180 (15-603)	0.261
CURRENT CD4+ T cells/mm3, median (min-max)	583 (6-1736)	353 (23-987)	0.076
CD8+T cells/mm3, median (min-max)	962 (142-3561)	841 (231-1426)	0.138
CD4/CD8 RATIO, (min-max)	0.6 (0.0-1.6)	0.6 (0.1-1.4)	0.702

• p: Fisher's exact test or Chi-Square or Mann-Whitney test.
  BMI: Body mass index.

Fourteen of 97 subjects (14.4%) presented liver stiffness ≥ 7 kPa by THE and median elastography was 5.4 kPa (range: 3.0–16.9 kPa). Out of 14 patients with elastography result > 7 kPa, five had elastography result above 11 kPa.

According to clinical evaluation, 80.4% (78/97) of the patients had normal body mass index (BMI), 7.2% (7/97) were underweight, 8.2% (8/97) were overweight, 2.1% (2/97) were obese and 2.1% (2/97) had short stature. Two out of eight overweight patients had THE measurement above 7 kPa. None of the obese patients had liver stiffness above 7 kPa. Only one obese patient met the criteria for metabolic syndrome. One patient had splenomegaly and four patients had hepatomegaly (Table 2). Elevated AST, ALT, AP, GGT were found in 2/97 (2.1%), 2/96 (2.1%), 2/95 (2.1%), 6/90 (6.7%) patients, respectively. Nine of 91 evaluated patients (9.9%) had platelets count < 150.000/mm³. Four out of nine patients with thrombocytopenia (platelet count less than 150,000/mm3) had presumed significant liver fibrosis (liver stiffness above 7 kPa).

Table 2
. Main Laboratory characteristics in patients with and without elevated liver stiffness (LS) assessed by transient hepatic elastography.

Laboratory Variables	Liver stiffness <7 kPa n = 83	Liver stiffness ≥ 7 kPa n = 14	p
Hepatomegaly	2.4%	14.3%	0.098
AST,U/L (min-max)	19.0 (8.0-50.0)	22.0 (12.0-80.0)	0.038
ALT, U/L (min-max)	15.0 (5.0-45.0)	20.0 (9.0-80.0)	0.061
AP, U/L (min-max)	93.5 (33.0-639.0)	96.5 (55.0-382.0)	0.992
Gamma GT, U/L (min-max)	25.0 (6.0-112.0)	22.0 (11.0-68.0)	0.519
Platelets/mm3 (min-max)	228,000 (113,000-406,000)	188,000 (48,000 - 355,000)	0.061
%Platelets <150,000/ mm3	6.4%	30.8%	0.022
Insulin, IU/mL (min-max)	10.8 (2.9-155.2)	13.1 (5.7-23.1)	0.983
Glucose, mg/dL (min-max)	84.0 (66.0-121.0)	83.5 (71.0-93.0)	0.677
Cholesterol, md/dL (min-max)	148.0 (83.0-228.0)	143.5 (92.0-279.0)	0.606
Triglycerides, mg/dL (min-max)	106.0 (36.0-379.0)	116.5 (60.0-422.0)	0.599

• p - Mann-Whitney test.
  AST- Aspartate aminotransferase.
  ALT-Alanine aminotransferase.
  AP-Alkaline Phosphatase.
  GGT-Gamma-glutamyltransferas.

APRI index was calculated for all subjects with a median value of 0.2 (range: 0.04–1.18); no patient had APRI>1.5. FIB4 index was also calculated for all subjects with a median value of 0.4 (range: 0.1–1.3); no patient had values over 3.25.

The only isolated parameter that could be significantly associated with significant liver fibrosis was platelet count under 150,000 platelets/mm³ (p = 0.022, Fisher's exact test) (Table 2). Likewise, AST levels were higher in those patients, when compared to patients who had normal THE (p = 0.038, Mann–Whitney test) (Table 2) and ALT levels tended to be higher too, although this was not statistically significant (p = 0.061, Mann–Whitney test).

CD4+ T lymphocyte counts had a tendency to be higher in patients with normal THE, when compared to those with altered values (p = 0.076, Mann–Whitney test) (Table 1).

There was no association between time on ddI and presence of significant liver fibrosis diagnosed by THE. The time on ddI was similar in the those with and without liver stifness.

Discussion

As a result of increasing survival of HIV-infected patients, noninfectious complications became frequent and significant. Progressive liver injury is a concern in subjects exposed to long-term antiretroviral drugs and the cytopathic effect of HIV infection could have silent evolution.^5–7

Considering the progression of the injury, early liver disease diagnosis is very important. Non-invasive methods for liver disease investigation in HIV-infected children and adolescents, predominantly the APRI and FIB4 indexes, have been used by some investigators.^20–22 APRI, FIB-4 and THE have higher diagnostic accuracy for ruling out, rather than for ruling in the presence of significant/advanced fibrosis, with negative predictive values above 90%, particularly to exclude advanced liver fibrosis (nodular fibrosis or cirrhosis).^17,18 As compared to APRI and FIB-4, THE exhibits similar accuracy to detect septal liver fibrosis and higher accuracy to identify cirrhosis.²³ Since APRI and FIB-4 are cheaper and more widely available, they are ideal screening tests, mainly in non-specialized settings.

In addition to these methods, we used THE which demonstrated a prevalence of significant liver fibrosis of 14.4% (14/97). One study, in HIV mono-infected adults without use of ddI-containing cART, showed 9.9% (10/101) of significant liver fibrosis (THE≥7.2).²⁴ Another study with 59 HIV mono-infected adults with elevated aminotransferase level for more than six months showed a higher proportion of this condition (42%) demonstrating that THE≥7.1 had a high sensitivity and specificity for detecting moderate fibrosis.²⁵

By contrast, a study evaluating adult hepatitis C monoinfected and HIV coinfected patients using different cutoffs, THE >6.8 kPa, APRI>0.6, FIB-4>1.4 showed low sensitivity for all noninvasive methods (70% THE, 54% APRI, 59% FIB-4).²⁶

In our investigation no patient had APRI index>1.5, or FIB-4 > 3.25. Therefore, in this cohort, 14 cases with significant/advanced fibrosis would have been missed had these methods been used not in association with THE. These findings emphasize the higher accuracy of THE, as compared to APRI and FIB-4.

Study in HIV-infected children and adolescents also found high prevalence of liver fibrosis using APRI and FIB-4 indexes. Liver disease was diagnosed in 20/79 (25%) of the patients, including 13/71 (18%) participants without coinfection and 7/8 (88%) with hepatitis B or C coinfection.²⁰

This study showed that laboratory and clinical factors associated with significant liver fibrosis diagnosed by THE were higher AST and percentage of patients with thrombocytopenia. Interestingly, those same variables are combined to form the APRI index, which has exhibited a low sensitivity in our cohort, when fibrosis stage was estimated through THE. Unknown factors specifically related to HIV infection could have been implicated in this poor diagnostic performance of APRI. Another study in HIV adults found that age and BMI had a positive association with liver stiffness, while CD4/CD8 ratio was negatively associated.²⁴ Age, BMI and CD4/CD8 ratio were not associated with altered transient elastography in the present study (Table 1). It is possible that early institution of HAART seen in the present cohort (perinatally HIV-infected adolescents and young adults) could have abrogated the negative impact of these variables. Nevertheless, we observed a trend of lower current CD4+ T lymphocyte counts in patients with abnormal THE (Table 1).

Prolonged use of ddI is strongly associated with liver nodular regenerative hyperplasia (NRH)²⁷ and complications associated with non-cirrhotic portal hypertension.²⁸ Use of ddI for over 11 years, as well as the combined use of ddI and stavudine for more than four years, has been characterized as risk factors for the development of non-cirrhotic portal hypertension in HIV-infected patients.²⁹ No association between time on ddI and significant liver fibrosis diagnosed by THE was observed in our study. In contrast, another research found a low prevalence (2%) of previously undiagnosed ddI-associated NRH using a screening strategy that combined THE, serum aminotransferase and platelet measurements followed by an ultrasound.³⁰

Imaging methodologies under study, as ultrasound, magnetic resonance and magnetic resonance elastography, are promising new approaches that provide simultaneous diagnosis, staging, and prognostic information for liver disease.³¹

The diagnosis of hepatic fibrosis using noninvasive methods is well established and validated for hepatitis C, both in Brazil³² and in other countries.³³ However, for HIV infection, noninvasive methods to identify hepatic fibrosis do not yet have a well-defined standardization. Due to the invasiveness of the procedure, we could not compare elastography with hepatic biopsy, which is the gold standard for assessing liver fibrosis. These factors, associated with the absence of a control group, might be limitations of this study.

New studies are needed to clarify the best procedures to optimize the diagnosis of hepatic fibrosis, especially in the young HIV-infected population in order to avoid late diagnosis and its complications. Based on the available data in the literature, and analyzing our findings, we conclude that THE can be considered a reliable method for detecting liver fibrosis. In non-specialized settings, the presence of elevated AST levels and low platelet count should incite the need for THE evaluation.

Conclusion

Liver stiffness was identified in 14.4% (14/97) of this cohort by liver elastography. Liver disease in HIV-infected adolescents and young adults manifests itself silently, so should be routinely investigated.

References

• ¹
  Nesheim SR, Hardnett F, Wheeling JT, Siberry GK, Paul ME, Emmanuel P, Bohannon B, Dominguez K. Incidence of opportunistic illness before and after initiation of highly active antiretroviral therapy in children. Pediatr Infect Dis J. 2013;32(10):1089-95.
• ²
  Prendergast AJ. Complications of long-term antiretroviral therapy in HIV-infected children. ArchDisChild. 2013;98(4):245-6.
• ³
  Crane M, Iser D, Lewin SR. Human immunodeficiency virus infection and the liver. World J Hepatol. 2012;4:91-8.
• ⁴
  Debes JD, Bohjanen PR, Boonstra A. Mechanisms of accelerated liver fibrosis progression during HIV infection. J ClinTranslHepatol. 2016;4(4):328-35.
• ⁵
  Giacomet V, Viganò A, Penagini F, Manfredini V, MaconiG CM, Zuccotti GV. Splenomegaly and variceal bleeding in a ten-year-old HIV-infected girl with noncirrhotic portal hypertension. Pediatr Infect Dis J. 2012;31:1059-60.
• ⁶
  Kochin I, Arnon R, Glasscock A, Kerkar N, Miloh T. Variceal bleeding in an adolescent with HIV diagnosed with hepatoportal sclerosis and nodular regenerative hyperplasia. J Pediatr GastroenterolNutr. 2010;50:340-3.
• ⁷
  Scherpbier HJ, Terpstra V, Pajkrt D, Puthakanit T, Ananworanich J, Foster C, van den Bergh Weerman M, Deurloo EE, van der Valk M, Kuijpers TW, Koot BG. Noncirrhotic portal hypertension in perinatally HIV-infected Adolescents treated with didanosine-containing antiretroviral regimens in childhood. Pediatr Infect Dis J. 2016;35(8):248-52.
• ⁸
  Parikh ND, Martel-Laferriere V, Kushner T, Childs K, Vachon ML, Dronamraju D, Taylor C, Fiel MI, Schiano T, Nelson M, Agarwal K, Dieterich DT. Clinical factors that predict noncirrhotic portal hypertension in HIV-Infected patients: a proposed diagnostic algorithm. J InfectDis. 2014;209:734-8.
• ⁹
  Gouvêa AF, Machado DM, Beltrão SC, Carmo FB, Mattar RH, Succi RC. Noncirrhotic portal hypertension in a human immunodeficiency virus (HIV) infected adolescent. Rev Paul Pediatr. 2015;33(2):246-50.
• ¹⁰
  Centers for Disease Control and Prevention. 1994 Revised classification system for human immunodeficiency virus infection in children less than 13 years of age; Official authorized addenda: human immunodeficiency virus infection codes and official guidelines for coding and reporting ICD-9-CM. MMWR 1994;43(No. RR-12):[inclusive page numbers].
• ¹¹
  World Health Organization. The WHO child growth standards. Growth reference, 5-19y. Geneva, Switzerland: World Health Organization; 2007 http://www.who.int/childgrowthref/en/ Accessed: 27/01/2018.
  » http://www.who.int/childgrowthref/en/
• ¹²
  Castéra L, Vergniol J, Foucher J, et al. Prospective comparison of transient elastography, Fibrotest, APRI, and liver biopsy for the assessment of fibrosis in chronic heptitis C. Gastroenterology. 2005;128:343-50.
• ¹³
  Shaheen AA, Wan AF, Myers RP. FibroTest and FibroScan for the prediction of hepatitis C-related fibrosis: a systematic review of diagnostic test accuracy. Am J Gastroenterol. 2007;102(11):2589-600.
• ¹⁴
  Friedrich-Rust M, Ong MF, Martens S, Sarrazin C, Bojunga J, Zeuzem S, Herrmann E. Performance of transient elastography for the staging of liver fibrosis: a meta-analysis. Gastroenterology. 2008;134(4):960-74.
• ¹⁵
  Stebbing J, Farouk L, Panos G, Anderson M, Jiao LR, Mandalia S, Bower M, Gazzard B, Nelson M. A meta-analysis of transient elastography for the detection of hepatic fibrosis. J ClinGastroenterol. 2010;44(3):214-9.
• ¹⁶
  Tsochatzis EA, Gurusamy KS, Ntaoula S, Cholongitas E, Davidson BR, Burroughs AK. Elastography for the diagnosis of severity of fibrosis in chronic liver disease: a meta-analysis of diagnostic accuracy. J Hepatol. 2011;54(4):650-9.
• ¹⁷
  Wai CT, Greenson JK, Fontana RJ, Kalbfleisch JD, Marrero JA, Conjeevaram HS, Lok AS. A simple noninvasive index can predict both significant fibrosis and cirrhosis in patients with chronic hepatitis C. Hepatology. 2003 Aug;38(2):518-26.
• ¹⁸
  Vallet-Pichard A, Mallet V, Nalpas B, Verkarre V, Nalpas A, Dhalluin-Venier V, Fontaine H, Pol S. FIB-4: an inexpensive and accurate marker of fibrosis in HCV infection. comparison with liver biopsy and fibrotest. Hepatology. 2007;46(1):32-6.
• ¹⁹
  Sterling RK, Lissen E, Clumeck N, Sola R, Correa MC, Montaner J, Sulkowski M, Torriani FJ, Dieterich DT, Thomas DL, Messinger D. Development ofa simple noninvasive index to predict significant fibrosis in patients with HIV/HCV coinfection. Hepatology. 2006;43(6):1317-25.
• ²⁰
  Pokorska-Śpiewak M, Stańska-Perka A, Popielska J, Ołdakowska A, Coupland U, Zawadka K, Szczepańska-Putz M, Marczyńska M. Prevalence and predictors of liver disease in HIV-infected children and adolescents. Sci Rep. 2017;7:1-8.
• ²¹
  Aurpibul L, Bunupuradah T, Sophan S, Boettiger D, WatiD K, NguyenL V, Saphonn V, Hansudewechakul R, Chokephaibulkit K, Lumbiganon P, Truong K H, DoV C, Kumarasamy N, Yusoff NKN, l Razali K, Kurniati N, Fong S M, Nallusamy R, Sohn A H. Prevalence and incidence of liver dysfunction and assessment of biomarkers of liver disease in HIV-infected Asian children. Pediatr Infect Dis J. 2015;34(6):e153-8.
• ²²
  Siberry GK, Cohen RA, Harris DR, Cruz ML, Oliveira R, Peixoto MF, Cervi MC, Hazra R, Pinto JA. Prevalence and predictors of elevated aspartate aminotransferase-to-platelet ratio index in Latin American perinatally HIV-infected children. Pediatr Infect Dis J. 2014;33(2):177-82.
• ²³
  Zarski JP, Sturm N, Guechot J, Paris A, Zafrani ES, Asselah T, Boisson RC, Bosson JL, Guyader D, Renversez JC, Bronowicki JP, Gelineau MC, Tran A, Trocme C, De Ledinghen V, Lasnier E, Poujol-Robert A, Ziegler F, Bourliere M, Voitot H, Larrey D, Rosenthal-Allieri MA, Fouchard Hubert I, Bailly F, Vaubourdolle M. Comparison of nine blood tests and transient elastography for liver fibrosis in chronic hepatitis C: the ANRS HCEP-23 study. J Hepatol. 2012;56(1):55-62.
• ²⁴
  Sulyok M, Ferenci T, Makara M, Horváth G, Szlávik J, Rupnik Z, KormosL Gerlei Z, Sulyok Z, Vályi-Nagy I. Hepatic fibrosis and factors associated with liver stiffness in HIV mono-infected individuals. PeerJ. 2017;5:1-16.
• ²⁵
  Morse CG, McLaughlin M, Proschan M, Koh C, Kleiner DE, Heller T, Kovacs JA. Transient elastography for the detection of hepatic fibrosis in HIV-monoinfected adults with elevated aminotransferases on antiretroviral therapy. AIDS. 2015;29(17):2297-302.
• ²⁶
  Guilabert M I G, Mena-Bernala C H, Gonz´alezb J P, Perez M A P. Retrospective study of FibroScan, APRI, FIB-4 and FORNS indexes compared with liver biopsy in the evaluation of liver fibrosis in patients with chronic hepatitis C monoinfection and HIV coinfection. GastroenterolHepatol. 2010;33(6):425-32.
• ²⁷
  Sood A, Castrejón M, Saab S. Human immunodeficiency virus and nodular regenerative hyperplasia of liver: a systematic review. World J Hepatol. 2014;6:55-63.
• ²⁸
  Maida I, Garcia-Gasco P, Sotgiu G, Rios MJ, Vispo ME, MartinCarbonero L, Barreiro P, Mura MS, Babudieri S, Albertos S, Garcia-Samaniego J, Soriano V. Antiretroviral-associated portal hypertension: a new clinicalcondition? Prevalence, predictors and outcome. AntivirTher. 2008;13:103-7.
• ²⁹
  Schouten JN, Vander Ende ME, Koëter T, Rossing HH, Komuta M, Verheij J, Van der Valk M, Hansen BE, Janssen HL. Risk factors and outcome of HIV-associated idiopathic noncirrhotic portal hypertension. Aliment PharmacolTher. 2012;36:875-85.
• ³⁰
  Logan S, Rodger A, Maynard-Smith L, O'Beirne J, Fernandez T, Ferro F, Smith C, Bhagani S. Prevalence of significant liver disease in human immunodeficiency virus-infected patients exposed to Didanosine: a cross sectional study. World J Hepatol. 2016;8(36):1623-8.
• ³¹
  Chin JL, Pavlides M, Moolla A, Ryan J D. Non-invasive markers of liver fibrosis: adjuncts or alternatives to liver biopsy?. Front Pharmacol. 2016;7:1-19.
• ³²
  Secretaria de Vigilância em Saúde Departamento de Vigilância, Prevenção e Controle das Infecções Sexualmente Transmissíveis, do HIV/Aids e das Hepatites Virais. Brasil Ministério da Saúde. Prevenção e Controle das Infecções Sexualmente Transmissíveis, do HIV/Aids e das Hepatites Virais. Protocolo Clínico e Diretrizes Terapêuticas para Hepatite C e Coinfecções / Ministério da Saúde, Secretaria de Vigilância em Saúde, Departamento de Vigilância, Prevenção e Controle das Infecções Sexualmente Transmissíveis, do HIV/ Aids e das Hepatites Virais, 68. : il: Brasília : Ministério da Saúde; 2019.
• ³³
  Shah H, Bilodeau M, Burak KW, Cooper C, Klein M, Ramji A, Smyth D, Feld JJ. The management of chronic hepatitis C: 2018 guideline update from the Canadian Association for the Study of the Liver. CMAJ. 2018;190(22):677-87.

Publication Dates

• Publication in this collection
  01 Oct 2021
• Date of issue
  2021

History

• Received
  8 Oct 2020
• Accepted
  10 Apr 2021