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Title: Vitamin D-binding protein gene polymorphism predicts pegylated interferon-related HBsAg seroclearance in HBeAg-negative Thai chronic hepatitis B patients: A multicentre study
Authors: Kessarin Thanapirom
Sirinporn Suksawatamnuay
Wattana Sukeepaisarnjaroen
Sombat Treeprasertsuk
Tawesak Tanwandee
Phunchai Charatcharoenwitthaya
Satawat Thongsawat
Apinya Leerapun
Teerha Piratvisuth
Rattana Boonsirichan
Chalermrat Bunchorntavakul
Chaowalit Pattanasirigool
Bubpha Pornthisarn
Supot Tuntipanichteerakul
Ekawee Sripariwuth
Woramon Jeamsripong
Theeranan Sanpajit
Yong Poovorawan
Piyawat Komolmit
Keywords: Biochemistry, Genetics and Molecular Biology
Issue Date: 1-Jan-2019
Abstract: © 2019 Asian Pacific Organization for Cancer Prevention. Background: Vitamin D deficiency is related to poor clinical outcomes in patients with chronic hepatitis B virus (HBV) infection. Methods: We aimed to investigate the association between the genetic variants in the vitamin D metabolic pathway and the response to pegylated interferon (Peg-IFN) therapy in patients with HBeAg-negative chronic HBV infection. One hundred seven patients treated with Peg-IFN for 48 weeks were selected from 13 specialty hospitals. Eight genotypes of vitamin D cascade genes, including CYP27B1 (rs10877012), DHCR7 (rs12785878), CYP2R1 (rs2060793, rs12794714) and GC (rs4588, rs7041, rs222020, rs2282679), were found. Results: Eighty-two patients (83.7%) were infected with HBV genotype C. Eight patients had compensated liver cirrhosis (8.7%). At 24 weeks after treatment discontinuation, 41 patients (42.3%) achieved sustained treatment response, 53 (55.2%) obtained HBV DNA < 2,000 IU/ml, 6 (5.6%) gained HBsAg seroclearance, 2 (1.9%) had HBsAg seroconversion and 69 (64.5%) exhibited alanine aminotransferase (ALT) normalization. Multivariate analysis revealed that baseline HBsAg level (OR =0.06, 95% CI: 0.08-0.49, p=0.008) and the GC rs222020 TT genotype (OR=17.72, 95% CI: 1.07-294.38, p=0.04) independently predicted sustained HBsAg seroclearance. In addition, this genotype was a predictor for normalization of ALT (OR=4.61, 95%CI: 1.59-13.40, p=0.005) after therapy. The HBsAg levels at baseline and during and post-treatment tended to be reduced with the GC rs222020 TT compared with the non-TT genotypes. The other studied polymorphisms were not associated with treatment response. Conclusions: The GC rs222020 TT genotype, which is a variant in the vitamin D-binding protein gene, could identify HBeAg-negative patients who have a high probability to achieve HBsAg clearance and ALT normalization after treatment with Peg-IFN.
ISSN: 2476762X
Appears in Collections:CMUL: Journal Articles

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