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Aliment Pharmacol Ther. 2012 Jun;35(12):1434-42. doi: 10.1111/j.1365-2036.2012.05109.x. Epub 2012 Apr 24.

Implications of PNPLA3 polymorphism in chronic hepatitis C patients receiving peginterferon plus ribavirin.

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  • 1Department of Internal Medicine, Università degli Studi, Fondazione Ca' Granda IRCCS Ospedale Maggiore Policlinico, Milan, Italy. luca.valenti@unimi.it

Abstract

BACKGROUND:

Homozygosity for the PNPLA3 p.I148M polymorphism influences steatosis and fibrogenesis in chronic hepatitis C (CHC).

AIM:

To evaluate the effect of p.148M/M on sustained virological response (SVR) and viral kinetics in patients who underwent antiviral therapy with peg-interferon and ribavirin, stratified according to viral genotype and fibrosis severity, and secondarily, the interaction with interleukin-28B ( IL28B ) genotype on liver damage.

METHODS:

In this observational study, we considered 602 treatment-naïve consecutive patients from tertiary referral centres in Milan and Vienna [61% genotype 1 (G1), 30% advanced fibrosis, 33% IL28B rs12979860 CC].

RESULTS:

The p.148M/M genotype, detected in 8% of patients, did not influence SVR in the overall series (P = 0.29), but it was associated with SVR (3/17, 17% vs. 56/121, 46%; P = 0.034) and complete early viral response (4/17, 23% vs. 68/121, 56%; P = 0.018) in G1/4 patients with advanced fibrosis. After adjustment for age, viral load, IL28B CC genotype, treatment dose, and steatosis, p.148M/M remained a predictor of SVR in G1/4 patients with advanced fibrosis (OR 0.23, 95% CI 0.04-0.87). The p.148M/M genotype was associated with more advanced fibrosis in the overall series (P = 0.049), whereas the rs12979860 IL28B CC genotype only in patients negative for p.148M/M (P = 0.017), independently of age, BMI and alanine transaminase levels (OR 1.51, 95% CI 1.01-2.27).

CONCLUSIONS:

PNPLA3 p.148M/M genotype was negatively associated with SVR and early viral kinetics independently of steatosis, albeit only in difficult-to-cure G1/4 patients with advanced fibrosis, whereas stratification for the p.148M/M PNPLA3 genotype unmasked an association between IL28B CC genotype and more severe liver fibrosis.

© 2012 Blackwell Publishing Ltd.

PMID:
22530607
[PubMed - indexed for MEDLINE]
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