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PNH, a rare, chronic, life-threatening disease, is characterized by hemolytic anemia due to uncontrolled activity of the complement alternative pathway (AP), bone marrow failure, and thrombosis. Inhibition of C5 by intravenously administered eculizumab and ravulizumab reduces intravascular hemolysis, but PNH red blood cells (RBCs) become opsonized and susceptible to extravascular hemolysis (Risitano et al, Blood 2009). Only approximately half of PNH patients become transfusion independent with eculizumab treatment (Hillmen et al, NEJM 2006).

Kulasekararaj: Alexion:Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Travel grants, Speakers Bureau;Ra Pharma:Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Travel grants, Speakers Bureau;BioCryst Pharmaceuticals, Inc.:Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees;Apellis:Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Travel grants, Speakers Bureau;Roche:Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau;Novartis:Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Travel grants, Speakers Bureau;Celgene:Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Travel grants, Speakers Bureau.Malherbe:Key Oncologics:Honoraria, Other: Conference sponsor;Novartis:Other: Conference sponsor;Astellas:Honoraria, Other: Conference sponsor;Takeda:Consultancy;Acino:Honoraria;Shire:Other: Conference sponsor;BioCryst Pharmaceuticals, Inc.:Consultancy;Janssen:Consultancy, Honoraria, Other: Conference sponsor;Roche:Honoraria, Other: Conference sponsor.McDonald:venetoclax advisory board in South Africa (in CLL context):Consultancy;Alberts Cellular Therapy:Current Employment.Cornpropst:BioCryst Pharmaceuticals, Inc.:Current Employment.Collis:BioCryst Pharmaceuticals, Inc.:Current Employment.Davidson:BioCryst Pharmaceuticals, Inc.:Current Employment.Chen:BioCryst Pharmaceuticals, Inc.:Current Employment.Tower:BioCryst Pharmaceuticals, Inc.:Current Employment.Gesty-Palmer:BioCryst Pharmaceuticals, Inc.:Current equity holder in publicly-traded company, Ended employment in the past 24 months.Sheridan:BioCryst Pharmaceuticals, Inc.:Current Employment.Risitano:Alexion:Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau;Alnylam:Research Funding;Novartis:Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau;Pfizer:Speakers Bureau;Achillion:Membership on an entity's Board of Directors or advisory committees;Apellis:Membership on an entity's Board of Directors or advisory committees, Speakers Bureau;Biocryst:Membership on an entity's Board of Directors or advisory committees;RA pharma:Research Funding;Amyndas:Consultancy;Samsung:Membership on an entity's Board of Directors or advisory committees;Roche:Membership on an entity's Board of Directors or advisory committees;Jazz:Speakers Bureau.