# Familial prevalence of psoriasis in patients with multiple sclerosis – results from an Australian survey

## TL;DR

This study finds a higher prevalence of psoriasis in family members of multiple sclerosis patients in Australia, suggesting shared genetic risks.

## Contribution

The study provides new evidence of familial psoriasis prevalence in an Australian MS cohort, highlighting potential genetic overlap.

## Key findings

- 17.2% of MS patients had a family history of psoriasis.
- Female MS patients with a family history of psoriasis had a higher risk of psoriasis (34.6%) compared to males (22.2%).

## Abstract

The familial association of psoriasis with multiple sclerosis (MS) has been observed in several international studies. Whether this link is applicable in an Australian setting has yet to be established. The aim of this study was to evaluate the prevalence of psoriasis in family members of an MS cohort in the Australian population.

A survey study of adult MS patients was conducted between 2018 and 2021 at the MS clinic, Royal North Shore Hospital, Sydney, Australia.

A total of 204 MS participants, with mean age of 48.8 years, were included in the study. Of these participants, 67 were male (32.8%) and 137 were female (67.2%). An increased rate of psoriasis was found among family members of MS patients: 35 (17.2%) MS patients had family history of psoriasis, and 11 patients reported a history of psoriasis themselves. Of the 35 MS patients with family history of psoriasis, female participants were found to be at a higher risk of psoriasis (34.6%, n = 9/26) as compared to their male counterparts (22.2%, n = 2/9).

This study demonstrates a significantly increased risk of psoriasis among family members of MS patients, suggesting overlap in genetic risk between the two immune-mediated diseases. Further prospective research is warranted to determine the characteristics of association in MS individuals with psoriasis or/and family history of psoriasis.