Table 4.

Comparison of patients with hTTP described in case reports to patients with hTTP reported by the United Kingdom and International Hereditary TTP Registries

hTTP
United Kingdom
Registry10 
International Registry11 Case reports patients
No. (%)Median (range)No. (%)Median (range)No. (%)Median (range)
Year of publication 2019  2019  2022  
Patients 73  120  226  
Female 51 (70)  62 (52)  129 (57)  
Age, y*       
 At diagnosis  24 (newborn-71)  17 (newborn-70)  16 (newborn-77) 
 At last follow-up  NA  26 (4-60)  23 (0 d-79) 
 At first symptoms  18 (newborn-67)  5 (newborn-70)  2 (newborn-63) 
First symptoms at birth NA  30 (25)  81 (36)  
Stroke 18 (25)  37 (31)  62 (27)  
Age at stroke NA  NA   22 (1 d-77) 
Myocardial infarction  5 (4)  5 (2)  
Age at myocardial infarction NA  NA  20 (3-53)  
Death 5 (7)  NA  11 (5)  
Age at death NA  NA   7 (newborn-79) 
hTTP
United Kingdom
Registry10 
International Registry11 Case reports patients
No. (%)Median (range)No. (%)Median (range)No. (%)Median (range)
Year of publication 2019  2019  2022  
Patients 73  120  226  
Female 51 (70)  62 (52)  129 (57)  
Age, y*       
 At diagnosis  24 (newborn-71)  17 (newborn-70)  16 (newborn-77) 
 At last follow-up  NA  26 (4-60)  23 (0 d-79) 
 At first symptoms  18 (newborn-67)  5 (newborn-70)  2 (newborn-63) 
First symptoms at birth NA  30 (25)  81 (36)  
Stroke 18 (25)  37 (31)  62 (27)  
Age at stroke NA  NA   22 (1 d-77) 
Myocardial infarction  5 (4)  5 (2)  
Age at myocardial infarction NA  NA  20 (3-53)  
Death 5 (7)  NA  11 (5)  
Age at death NA  NA   7 (newborn-79) 

Sixty-eight (30%) of the case report patients were included in the International Registry.11  There were no case report patients included in the United Kingdom Registry.10 

NA, not available.

*

Age is given in years, unless otherwise specified.

Case report data include 21 patients who died but who would not have been enrolled in the Registries: 18 patients who died without ADAMTS13 sequence analysis and 3 patients who had ADAMTS13 sequence confirmation but who died in their first days of life. Including these 21 deaths, the frequency of death would be 14%.

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