Abstract
Background
The genetic basis of predisposition to psoriasis is recognised; however, the response to psoriasis treatment in patients with different genetic predisposition is poorly understood.
Objective
To analyse the presence of the HLA-C*06:02 polymorphism in psoriatic patients treated with adalimumab.
Methods
Genomic DNA was extracted from whole blood of 122 patients with moderate-to-severe psoriasis treated with adalimumab for 3 years. Genotyping was performed using PCR. Disease severity was assessed by the Psoriasis Area and Severity Index (PASI) at day 0 and after 1, 3, 6, 12, 24 and 36 months. Logistic regression was used to evaluate the association between dependent variables (including HLA-C*06:02 status) and achievement of PASI 50, 75 and 90.
Results
No difference was observed after adalimumab treatment between C*06:02 positive (HLA-C*06:02-POS) patients (n = 46) and C*06:02 negative (HLA-C*06:02-NEG) patients (n = 76) over the 3-year follow-up period in terms of PASI response or time-course when PASI response was achieved. However, a small, but non-statistically significant difference was noted between genotypes for PASI 50 at 1 month (HLA-C*06:02-NEG: 44.7% vs. HLA-C*06:02-POS: 56.5%) and at 3 months (HLA-C*06:02-NEG: 71.1% vs. HLA-C*06:02-POS: 80.4%). Simple logistic regression analysis did not reveal an association between independent variables (including C*06:02 status) and PASI response; however, multivariate regression revealed that gender (females better than males) was associated with achievement of PASI 50 at month 1 (OR 0.34, 95% CI 0.16–0.72, p = 0.005) and of PASI 75 at 3 months (OR 0.36, 95% CI 0.16–0.8, p = 0.012).
Conclusion
Adalimumab reduced long-term severity in patients with moderate-severe psoriasis, independent of their HLA-C*06:02 status.
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MT., M.G, A.Z, M.P, C.G.E., M.B., S.T., M.C. F., L. B. have anything to declare.
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No sources of financial assistance were received to conduct the study described in the manuscript.
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This study was conducted in accordance with the Helsinki Declaration. All patients gave written informed consent to draw a vial of blood for DNA analyses as approved by ‘‘Tor Vergata Ethics Committee’’ (Approval No. 20745, v. 25 Mar 2005).
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M. Talamonti and M. Galluzzo contributed equally to this paper.
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Talamonti, M., Galluzzo, M., Zangrilli, A. et al. HLA-C*06:02 Does Not Predispose to Clinical Response Following Long-Term Adalimumab Treatment in Psoriatic Patients: A Retrospective Cohort Study. Mol Diagn Ther 21, 295–301 (2017). https://doi.org/10.1007/s40291-017-0261-4
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DOI: https://doi.org/10.1007/s40291-017-0261-4