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All About Bleeding

AFFINITY Clinical Studies


AFFINITY Enrolling children with severe

hemophilia A for open-label safety, efficacy and pharmacokinetic study of recombinant FVIII.
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rVIII-SingleChain PK Study Results Presented at ISTH

Pharmacokinetic results indicate rVIII-SingleChain may have advantages over multi-chain rFVIII.

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F1000 Medical Research Posters

View information about CSL Behring posters presented at scientific symposia about Recombinant Factor Therapies.
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Pharmacokinetic, Efficacy, and Safety Study of Recombinant Factor VIII Single Chain (rVIII-SingleChain) in Children With Severe Hemophilia A


Learn more by viewing the ClinicalTrials.gov study record detail (AFFINITY CSL627_3002).

AFFINITY Study Information

The Phase I/III study (CSL627_1001) is an open-label, non-randomized, efficacy, safety and PK study comparing octocog alfa and CSL Behring's recombinant factor VIII-SingleChain (rVIII-SC). The study consists of three parts, a PK period (Part 1), a continuation of dosing safety and efficacy period (Part 2) and a safety, efficacy, and repeat PK section (Part 3) including a surgical sub-study for subjects enrolled in Parts 2 and 3.

In Part 1 of the study, subjects will receive a single infusion of 50 IU/kg of octocog alpha followed by a single infusion of 50 IU/kg of rVIII-SC. In Parts 2 and 3 of the study, subjects will receive infusions of rVIII-SingleChain to prevent and treat bleeding (if required), at a dose and frequency determined by their study doctor (based on the subject's underlying bleeding phenotype).

Recombinant factor VIII (rFVIII) consists of two linked protein chains – a heavy one and a light one. Under certain conditions, these chains can dissociate, resulting in the formation of separated, or "dissociated," rFVIII chains. The CSL Behring rVIII-SingleChain uses a strong, covalent bond that connects the light and heavy chains, thereby creating a single chain rFVIII.

In-house studies have shown that the molecular integrity of rFVIII is significantly increased using the single-chain design, resulting in a homogenous product that is more stable than currently available FVIII products. In addition, in-vitro studies have shown that rVIII-SingleChain demonstrates a very strong affinity for von Willebrand factor, resulting in a faster and more efficient binding to VWF. The FVIII/VWF complex plays an important role in the physiological activity and clearance of FVIII and has been shown to have an influence on the presentation of FVIII to the immune system.

More information about the study design can be found at www.clinicaltrials.gov.

Last Updated: 4/22/2015 3:20 PM
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