Severe generalized junctional epidermolysis bullosa, a lethal hereditary blistering disorder, is usually treated by palliative care. Allogeneic stem cell transplantation (SCT) has been proposed as a therapeutic approach, yet without clinical evidence. Decision making was evaluated retrospectively in 76 patients with severe generalized junctional epidermolysis bullosa born in the years 2000-2015. The diagnosis was based on the absence of laminin-332 in skin biopsies. With an incidence of 1 of 150,000, severe generalized junctional epidermolysis bullosa occurred more often than published previously. Eleven as yet unreported mutations in the laminin-332 genes were detected. Although patients homozygous for the LAMB3 mutation c.1903C>T lived longer than the others, life expectancy was greatly diminished (10.8 vs. 4.6 months). Most patients failed to thrive. In two patients with initially normal weight gain, the decision for SCT from haploidentical bone marrow or peripheral blood was made. Despite transiently increasing skin erosions, the clinical status of both subjects stabilized for several weeks after SCT, but finally deteriorated. Graft cells, but no laminin-332, were detected in skin biopsies. The patients died 96 and 129 days after SCT, respectively, one of them after receiving additional skin grafts. Treatment of severe generalized junctional epidermolysis bullosa by SCT is a last-ditch attempt still lacking proof of efficacy.
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