In psoriasis, a study evaluated the influence of the SLCO1C1 rs3794271 and PDE3A rs11045392 polymorphisms on anti-TNF response in 130 white patients (from Spain) and showed that patients carrying the C allele obtained a better response (ΔPASI after 3 months) (p = 0.00057) [53]. This evidence concerns the gene TNF and psoriasis.