title: Long term follow up of congenital thrombotic thrombocytopenic purpura (Upshaw-Schulman syndrome) on hemodialysis for 19 years: a case report.
abstract: BACKGROUND
  Thrombotic thrombocytopenic purpura (TTP) is frequently associated with renal abnormalities, but there have been few reports about renal abnormalities in patients with hereditary TTP. In particular, little is known about the long-term prognosis of patients with childhood-onset congenital TTP.
  
  
  METHODS
  We report a Japanese patient with congenital TTP (Upshaw-Schulman syndrome) who was followed for 19 years after initiation of hemodialysis when he was 22 years old. At the age of 6 years, the first episode of purpura, thrombocytopenia, and proteinuria occurred without any precipitating cause. He underwent living-related donor kidney transplantation from his mother, but the graft failed after 5 months due to recurrence of TTP. Even after resection of the transplanted kidney and resumption of regular hemodialysis, TTP became refractory to infusion of fresh frozen plasma (FFP). Therefore, splenectomy was performed and his disease remained in remission for 10 years. However, TTP recurred at the age of 39 years. Plasma activity of ADAMTS13 (a disintegrin and metalloprotease with thrombospondin type I domain 13) was less than 3%, while ADAMTS13 inhibitor was not detected (<0.5 Bethesda units/mL). The patient died suddenly after hemodialysis at the age of 41 years. Subsequent genetic analysis of this patient and his parents revealed two different heterozygous mutations of ADAMTS13, including a missense mutation in exon 26 (c.T3650C causing p.I1217T) inherited from his father and a missense mutation in exon 21 (c.G2723A causing p.C908Y) inherited from his mother. The former mutation has not been detected before in Japan, while the latter mutation is common in Japan. A retrospective review showed that serum C3 levels were consistently low while C4 levels were normal during follow-up, and C3 decreased much further during each episode of TTP.
  
  
  CONCLUSIONS
  Congenital TTP was diagnosed from the clinical, biochemical, and genetic findings. Infusion of FFP controlled each thrombotic episode, but the effect was limited and of short duration. Review of the complement profile in this patient suggested that a persistently low serum C3 level might be associated with refractory TTP and a worse renal prognosis.
authors.affiliation: Nephrology Center, Toranomon Hospital, Tokyo, Japan. kokims-frz@umin.ac.jp
authors.forename: Koki
authors.initials: K
authors.lastname: Mise
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Ubara
authors.forename: Masanori
authors.initials: M
authors.lastname: Matsumoto
authors.forename: Keiichi
authors.initials: K
authors.lastname: Sumida
authors.forename: Rikako
authors.initials: R
authors.lastname: Hiramatsu
authors.forename: Eiko
authors.initials: E
authors.lastname: Hasegawa
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yamanouchi
authors.forename: Noriko
authors.initials: N
authors.lastname: Hayami
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Suwabe
authors.forename: Junichi
authors.initials: J
authors.lastname: Hoshino
authors.forename: Naoki
authors.initials: N
authors.lastname: Sawa
authors.forename: Kenichi
authors.initials: K
authors.lastname: Ohashi
authors.forename: Koichi
authors.initials: K
authors.lastname: Kokame
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Miyata
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Fujimura
authors.forename: Kenmei
authors.initials: K
authors.lastname: Takaichi
mesh_terms: D000328:Adult; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010375:Pedigree; D011697:Purpura, Thrombotic Thrombocytopenic / Q000175:diagnosis* / Q000235:genetics / Q000628:therapy*; D006435:Renal Dialysis / Q000639:trends*; D013997:Time Factors