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Updated: Jul 21, 2025

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
Published on: September 7, 2013
Evidence for a causal relationship between psoriasis and cutaneous melanoma: a bidirectional two-sample Mendelian
Nana Zhao1, Pengsen Guo2, Mei Tang1
1Department of Operating Room, The Third People's Hospital of Chengdu, Chengdu, China.
Background And Objective:
Existing cross-sectional and retrospective studies were unable to establish a causal relationship between psoriasis and cutaneous melanoma (CM). We sought to evaluate the causal role between psoriasis and CM.
Methods:
We performed a bidirectional two-sample Mendelian randomization analysis using summary statistics from genome-wide association studies of psoriasis and CM among individuals of predominantly European ancestry. Mendelian randomization-Egger regression, inverse variance weighting, Mendelian Randomization Pleiotropy RESidual Sum and Outlier, weighted mode, and weighted median were used to examine the causal effect between psoriasis and CM.
Results:
Genetically predicted psoriasis was a significant risk factor for CM (odds ratio, 1.69; 95% confidence interval, 1.15-2.48; P = 0.025). In contrast, no association was observed between genetically predicted CM and psoriasis.
Conclusion:
Our findings corroborated the existence of genetically predicted psoriasis increases risk of CM. Enhanced early screening of cutaneous melanoma in patients with psoriasis may improve clinical burden. However, we did not find evidence for a causal link from CM to psoriasis, so further studies are required to elucidate the effect of CM activity on psoriasis.
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Criteria for Causality: Bradford Hill Criteria - II

