Human papillomavirus symptomatic infection associated with increased risk of new-onset alopecia areata: A nationwide population-based cohort study.
BACKGROUND
We investigated the correlation between a history of human papillomavirus (HPV) infection and alopecia areata risk.


METHODS
The study cohort comprised 30,001 patients with newly diagnosed HPV infection between 2000 and 2012; and with use of computer-generated randomly numbers, patients not had HPV infection were randomly selected as the comparison cohort. HPV infection cohort were matched to comparison individuals at a 1:1 ratio by age, gender and index year. All study individuals were followed up until they developed alopecia areata, withdraw from the insurance program, lost to follow-up, or until the end of 2013. Cox proportional hazards regression analysis was used to analyze the risk of alopecia areata with hazard ratios (HRs) and 95% confidence intervals (CIs) between the HPV and control cohort.


RESULTS
The adjusted hazard ratio (aHR) of alopecia areata for HPV patients relative to controls was 2.55 (95% C.I. = 1.88-3.47) after adjusting sex, age and comorbidities. Subgroup analysis indicated that patients with HPV infections had a significantly greater risk of alopecia areata for both genders, all age subgroups, and those with mental disorder diseases.


CONCLUSIONS
A history of HPV infection is associated with the development of subsequent alopecia areata in Taiwanese subjects.
['Tu|Ting-Yu|TY|', 'Chang|Renin|R|', 'Lai|Jung-Nien|JN|', 'Tseng|Chu-Chiao|CC|', 'Chen|Ming-Li|ML|', 'Yip|Hei-Tung|HT|', 'Hung|Yao-Min|YM|', 'Cheng-Chung Wei|James|J|']
Human papillomavirus Alopecia areata Cohort study National health insurance research database Nationwide population Taiwan