Psoriasis is a chronic skin disease in which genetics play a major role. Although many genome-wide association studies have been\nperformed in psoriasis, knowledge of the age at onset remains limited. Therefore, we analyzed 173 single-nucleotide polymorphisms\nin genes associated with psoriasis and other autoimmune diseases in patients with moderate-to-severe plaque psoriasis type I (earlyon set,\n<40 years) or type II (late-onset, �40 years) and healthy controls. Moreover, we performed a comparison between patients\nwith type I psoriasis and patients with type II psoriasis. Our comparison of a stratified population with type I psoriasis (
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