Pustular psoriasis of pregnancy (PPP) can lead to life-threatening complications. The objective of this study is to report clinical and genetic spectrum, prognostic factors and management options. A retrospective study was designed including eight PPP patients. Clinical data were collected, and performed genetic and statistical analysis to identify factors associated with fetal complications, resistance to treatment and post-partum flare extension. A systematic review of the literature was also carried out. Eight Tunisian patients, with a mean age of 23 ± 3.3 years, were included. They presented 14 flares (F) during pregnancies and one flare after delivery. Additional GPP flares outside pregnancy periods were noted in 2/8 of patients. The mean duration of PPP flares was 16.66 ± 7.8 weeks. The first flare occurred at a gestational age of 26 ± 5 weeks. Only 2/8 studied patients presented a homozygous mutation c.80 T > C (p.L27P) in IL36RN gene. Used treatments were topical steroids (n = 12F), systemic steroids (n = 5F), ciclosporin (n = 1F), UVB (n = 1F) and acitretin (in post-partum n = 6F). Complications were oligoamnios (n = 2), intra-uterine growth retardation (n = 1), fetal death in utero (n = 1), prematurity (n = 3), low weight at birth (n = 2). A significant association was found between (i) occurrence of fetal complications and early gestational age at the onset (p = 0.036), (ii) resistance to topical steroids and body surface affected area (p = 0.008), (iii) presence of mutation c.80 T > C in PPP flares and low serum levels of calcium (p = 0.01). Our systematic review of the literature identified 39 patients with 41 flares of PPP. Only 7/39 patients presented a causative mutation in IL36RN and CARD14 genes. PPP is characterized by a phenotypic heterogeneity and can be associated to IL36RN mutations. Its early onset can be associated with fetal complications. Systemic steroids and cyclosporine remain the most used therapies.
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