Tretten is a recombinant analog of the human Factor XIII A-subunit that is produced in yeast cells and then further purified. It is a sterile freeze-dried powder that is reconstituted for IV administration.
The efficacy of Tretten was evaluated in a Phase 3 trial that enrolled 77 patients with congenital Factor XIII A-subunit deficiency. Treatment with Tretten prevented bleeding in 90% of the patients when administered monthly. Tretten is expected to be available in early 2014 from Novo Nordisk, Inc.
See the FDA press release here.