An Open Label Study of the Effects of Eculizumab in CD59 Deficiency

It has been shown in some scientific studies that lack of CD59 in the context of the disease paroxysmal nocturnal hemoglobinuria (PNH)leads to chronic hemolysis. The investigators have identified patients wirh CD59 deficiency that suffers from chronic hemolysis and demyelinating disease. It was shown that complement terminal pathway can cause cause inflammation in nervous system. Complement can greatly increase the immune attack in the nerves. Eculizumab has already been shown to be effective in a rare blood disorder known as PNH. Attacks of PNH are also mediated through complement. Therefore, the investigators of this study are investigating whether by 'turning off' complement in CD59 deficiency, further attacks of hemolysis and nerve injury can be avoided.

The primary (most important) objectives of this study are to determine:

Whether Eculizumab ameliorate the neurological condition documented in the last month before treatment and whether it reduces the relapse frequency in patients with relapsing chronic inflammatory demyilinating polyneuropathy. The number of attacks during the one year treatment period will be compared to the number of attacks that occurred prior to initiation of eculizumab treatment. For patients with more than 2 year disease duration, the average number of attacks in the preceding 2 years will be calculated. For patients with less than 2 years disease duration the number of attacks in the preceding year will be used.

Whether Eculizumab reduces chronic hemolysis as judged by LDH levels, and haptoglobin, and level of hemoglobin. the same for corticosteroids and or I.V. IgG consumption before and after treatment with eculizumab.

The safety profile of eculizumab in patients with CD59 deficiency will be determined by parents report evry other week, documentation of clinic referral and hospitalizations. The number of participants with advers events will be determined.