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Advancing personalized care in hemophilia A: ten years' experience with an advanced category antihemophilic factor prepared using a plasma/albumin-free method.

Berntorp, Erik LU ; Spotts, Gerald; Patrone, Lisa and Ewenstein, Bruce M (2014) In Biologics : targets & therapy 8(Apr 5). p.115-127
Abstract
Detailed analysis of data from studies of recombinant antihemophilic factor produced using a plasma/albumin-free method (rAHF-PFM) in previously treated patients showed a substantial level of interpatient variation in pharmacokinetics (PKs), factor VIII dosing, and annualized bleed rate (ABR), suggesting that individual patient characteristics contributed to outcome. For example, plasma half-life (t1/2), recovery, and clearance appeared to differ between patients aged <6 years and 10-65 years. Prophylaxis resulted in lower ABRs than episodic treatment in both age groups; better adherence to the prophylactic regimen resulted in a lower ABR in patients aged 10-65 years. The weekly frequency of dosing and adherence to dosing were both... (More)
Detailed analysis of data from studies of recombinant antihemophilic factor produced using a plasma/albumin-free method (rAHF-PFM) in previously treated patients showed a substantial level of interpatient variation in pharmacokinetics (PKs), factor VIII dosing, and annualized bleed rate (ABR), suggesting that individual patient characteristics contributed to outcome. For example, plasma half-life (t1/2), recovery, and clearance appeared to differ between patients aged <6 years and 10-65 years. Prophylaxis resulted in lower ABRs than episodic treatment in both age groups; better adherence to the prophylactic regimen resulted in a lower ABR in patients aged 10-65 years. The weekly frequency of dosing and adherence to dosing were both significantly and inversely related to the rate of bleeding (young children, P<0.0001 for both all bleeds and joint bleeds; older patients, P<0.0001 for all bleeds and P<0.05 for joint bleeds), as was adherence to dosing frequency (P<0.0001 for all comparisons). A post-marketing randomized study of prophylaxis demonstrated that a PK-guided dosing regimen, based on an individual patient's rAHF-PFM PK (infusion interval, estimated t1/2, and recovery), was as effective as standard prophylaxis and that both prophylactic regimens were superior to episodic treatment with respect to ABR and quality of life measures. Thus, compared with standard prophylaxis, the PK-guided regimen achieved comparable efficacy with fewer weekly infusions. A two-compartment population PK model describes the PK data across the entire age range and forms the basis for future PK-guided therapy with rAHF-PFM. The model confirmed a shorter t1/2 and faster clearance of rAHF-PFM in children <6 years of age versus patients ≥10 years and predicted similar PK parameters with either a full or reduced blood sampling schedule, offering the potential for the use of PK-guided, individualized treatment in the routine clinical care setting. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biologics : targets & therapy
volume
8
issue
Apr 5
pages
115 - 127
publisher
Dove Medical Press Ltd.
external identifiers
  • pmid:24741292
  • scopus:84898433309
ISSN
1177-5475
DOI
10.2147/BTT.S53456
language
English
LU publication?
yes
id
443c31e2-e30b-46be-bf5e-0d306b584955 (old id 4429942)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/24741292?dopt=Abstract
date added to LUP
2014-05-05 17:52:46
date last changed
2017-11-12 03:43:38
@article{443c31e2-e30b-46be-bf5e-0d306b584955,
  abstract     = {Detailed analysis of data from studies of recombinant antihemophilic factor produced using a plasma/albumin-free method (rAHF-PFM) in previously treated patients showed a substantial level of interpatient variation in pharmacokinetics (PKs), factor VIII dosing, and annualized bleed rate (ABR), suggesting that individual patient characteristics contributed to outcome. For example, plasma half-life (t1/2), recovery, and clearance appeared to differ between patients aged &lt;6 years and 10-65 years. Prophylaxis resulted in lower ABRs than episodic treatment in both age groups; better adherence to the prophylactic regimen resulted in a lower ABR in patients aged 10-65 years. The weekly frequency of dosing and adherence to dosing were both significantly and inversely related to the rate of bleeding (young children, P&lt;0.0001 for both all bleeds and joint bleeds; older patients, P&lt;0.0001 for all bleeds and P&lt;0.05 for joint bleeds), as was adherence to dosing frequency (P&lt;0.0001 for all comparisons). A post-marketing randomized study of prophylaxis demonstrated that a PK-guided dosing regimen, based on an individual patient's rAHF-PFM PK (infusion interval, estimated t1/2, and recovery), was as effective as standard prophylaxis and that both prophylactic regimens were superior to episodic treatment with respect to ABR and quality of life measures. Thus, compared with standard prophylaxis, the PK-guided regimen achieved comparable efficacy with fewer weekly infusions. A two-compartment population PK model describes the PK data across the entire age range and forms the basis for future PK-guided therapy with rAHF-PFM. The model confirmed a shorter t1/2 and faster clearance of rAHF-PFM in children &lt;6 years of age versus patients ≥10 years and predicted similar PK parameters with either a full or reduced blood sampling schedule, offering the potential for the use of PK-guided, individualized treatment in the routine clinical care setting.},
  author       = {Berntorp, Erik and Spotts, Gerald and Patrone, Lisa and Ewenstein, Bruce M},
  issn         = {1177-5475},
  language     = {eng},
  number       = {Apr 5},
  pages        = {115--127},
  publisher    = {Dove Medical Press Ltd.},
  series       = {Biologics : targets & therapy},
  title        = {Advancing personalized care in hemophilia A: ten years' experience with an advanced category antihemophilic factor prepared using a plasma/albumin-free method.},
  url          = {http://dx.doi.org/10.2147/BTT.S53456},
  volume       = {8},
  year         = {2014},
}