Platelet-rich plasma as a therapy for androgenic alopecia: a systematic review and meta-analysis.
OBJECTIVE
The past decade has seen platelet-rich plasma (PRP) become a popular therapy around the world as a treatment for androgenetic alopecia (AGA). These systematic review and meta-analyses assess the effectiveness and adverse effects of PRP to determine the role of PRP as a treatment for AGA among the other non-surgical treatment modalities.


METHODS
This study follows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and is registered under the PROSPERO ID CRD42019136329. Seven databases were searched from inception through May 2019. Meta-analyses of randomized controlled trials (RCTs) were performed to evaluate the effect of PRP treatments on hair density and hair thickness.


RESULTS
Thirty studies, including 687 patients, met our inclusion criteria. Twenty-nine studies reported beneficial results, and 24 studies reached statistical significance on a measured outcome. Ten RCTs were included. Our meta-analyses show that PRP treatment increases hair density and hair thickness.


CONCLUSIONS
PRP is an autologous treatment that lacks serious adverse effects and effectively improves hair density and hair thickness in men and women with AGA. Future research should include low risk-of-bias RCTs to optimize treatment protocols, investigate variability among studies, and to obtain more data on hair thickness changes.
['Evans|Adam G|AG|0000-0001-8535-7583', 'Mwangi|James M|JM|', 'Pope|Rand W|RW|', 'Ivanic|Mirjana G|MG|', 'Botros|Mina A|MA|', 'Glassman|Gabriella E|GE|', 'Pearce|F Bennett|FB|', 'Kassis|Salam|S|']
Platelet-rich plasma androgenic alopecia hair loss injection therapy