Abstract
Background and aims
Non-alcoholic fatty liver disease (NAFLD) commonly affects subjects with obesity, yet non-obese NAFLD is increasingly being recognized. We aimed to investigate the clinicopathological and genetic characteristics of non-obese NAFLD patients.
Methods
The clinical, histological and genetic data of 84 NAFLD patients with biopsy for abnormal liver function test were reviewed. Both NAS-CRN and SAF scoring systems were applied for histopathological evaluation. PNPLA3 and TMS6F2 genotyping were also performed.
Results
All of the 84 patients were histologically diagnosed with non-alcoholic steatohepatitis (NASH), with 36 of them (42.9%) being non-obese (BMI < 25 kg/m2). Compared with the obese group, non-obese group were predominantly females (88.9% vs 52.1%, p < 0.001), tended to have higher prevalence of diabetes (p = 0.068). More importantly non-obese patients had a significant higher prevalence of advanced fibrosis (F ≥ 3) (58.3% vs 29.2%, p = 0.013), and a trend of higher degree of ballooning (p = 0.061). In addition, values of liver stiffness measurement were also significantly higher in non-obese group (12.1 kPa vs 8.1 kPa, p = 0.032). There was also a trend of higher prevalence of TM6SF2 T allele in non-obese group (p = 0.085), while the prevalence of PNPLA3 risk allele did not differ between two groups. Multivariate analysis showed that higher fasting glucose (p = 0.038) and lower serum platelets (p = 0.040) were two independent predictors for advanced fibrosis in non-obese patients.
Conclusions
Non-obese NASH patients have a female predominance and more advanced fibrosis. Liver biopsy is crucial to evaluate the severity of disease in non-obese patients especially those with abnormal liver biochemistry.
Clinical trial number
NCT03386890.
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Abbreviations
- NAFLD:
-
Non-alcoholic fatty liver disease
- NASH:
-
Non-alcoholic steatohepatitis
- MetS:
-
Metabolic syndrome
- BMI:
-
Body mass index
- PNPLA3 :
-
Polymorphisms of patatin-like-phospholipase domain-containing protein 3
- TM6SF2 :
-
Transmembrane 6 superfamily antigen 2
- WC:
-
Waist circumference
- ALT:
-
Alanine aminotransferase
- AST:
-
Aspartate aminotransferase
- ALP:
-
Alkaline phosphatase
- GGT:
-
γ-Glutamyltransferase
- CHE:
-
Cholinesterase
- LDL-C:
-
Low-density lipoprotein cholesterol
- HDL-C:
-
High-density lipoprotein cholesterol
- TG:
-
Triglycerides
- UA:
-
Uric acid
- PTA:
-
Prothrombin activity
- HOMA-IR:
-
Homeostatic model assessment insulin resistance
- SBP:
-
Systolic blood pressure
- DBP:
-
Diastolic blood pressure
- FPG:
-
Fasting plasma glucose
- LSM:
-
Liver stiffness measurements
- CAP:
-
Controlled attenuation parameter
- H&E:
-
Hematoxylin and eosin
- NASH CRN:
-
NASH Clinical Research Network
- SD:
-
Standard deviation
- IQR:
-
Interquartile range
- TE:
-
Transient elastography
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Acknowledgements
This study was funded by Beijing Municipal Administration of Hospitals Clinical Medicine Development of special funding support (XMLX201606), The Digestive Medical Coordinated Development Center of Beijing Municipal Administration of Hospitals (XXZ03) and Research Foundation of Beijing Friendship Hospital, Capital Medical University (yyqdkt2017-8).
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Study design: JJ, RS, ASHG, HY. Data collection: QW, MW, XO, YW, WD, XW. Liver biopsy assessment: XZ, RS, ASHG. Statistical analysis: QW, YS, YK, SW. Manuscript writing: QW. Genotype analysis: PW, QW, MW. Critical revision of the manuscript: HY, JJ, RS, ASHG.
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Qianyi Wang, Hong You, Xiaojuan Ou, Xinyan Zhao, Yameng Sun, Min Wang, Ping Wang, Yu Wang, Weijia Duan, Xiaoming Wang, Shanshan Wu, Yuanyuan Kong, Romil Saxena, Annette S. H. Gouw, Jidong Jia declare that they have no conflicts of interest.
Ethical approval
The study was conducted in accordance with the Declaration of Helsinki. The study protocol was approved by the institutional Ethics Committee (Ethical approval no. 2015-P2-070-01). All patients signed informed consent for liver biopsy and blood sample storage.
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Romil Saxena, Annette S. H. Gouw and Jidong Jia share co-corresponding authorship.
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Wang, Q., You, H., Ou, X. et al. Non-obese histologically confirmed NASH patients with abnormal liver biochemistry have more advanced fibrosis. Hepatol Int 13, 766–776 (2019). https://doi.org/10.1007/s12072-019-09982-z
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DOI: https://doi.org/10.1007/s12072-019-09982-z