Comparison of the recovery and half-life of a high-purity factor IX concentrate with those of a factor IX complex concentrate. Factor IX Study Group.
BACKGROUND
Recovery and half-life estimations were carried out to compare a high-purity factor IX concentrate with an established factor IX complex concentrate.


METHODS
Two high-purity factor IX concentrates, which are identical except for the presence or absence of heparin (Immuninehep-plus and Immuninehep-minus), were evaluated in two independent crossover studies using an intermediate-purity factor IX complex concentrate (Bebulin) as reference drug.


RESULTS
In the Immuninehep-plus crossover study (n = 27), Immuninehep-plus and Bebulin had, respectively, a recovery of 0.90 +/- 0.26 and 0.84 +/- 0.23 IU per dL per IU per kg, a compartmental half-life of 17.11 +/- 6.18 and 15.94 +/- 4.69 hours, and an effective half-life of 16.51 +/- 3.48 and 16.48 +/- 4.26 hours. In the Immuninehep-minus crossover study (n = 26), Immuninehep-minus and Bebulin had, respectively, a recovery of 0.92 +/- 0.31 and 1.02 +/- 0.36 IU per dL per IU per kg, a compartmental half-life of 17.42 +/- 5.60 and 18.77 +/- 6.27 hours, and an effective half-life of 16.39 +/- 4.44 and 16.48 +/- 4.28 hours. Equivalence tests indicated that the recovery and half-life of Immunine, with or without heparin, are equivalent to those of Bebulin.


CONCLUSIONS
The equivalence in pharmacokinetics and bioavailability indicates that the dosage schedule for Immunine should be the same as or very similar to that of Bebulin. The high specific activity of the former, however, allows administration at lower volumes.
Poon
M C
MC
Foothills Hospital, University of Calgary, Alberta, Canada.
Aledort
L M
LM
Anderle
K
K
Kunschak
M
M
Morfini
M
M
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D018592:Cross-Over Studies; D005164:Factor IX / Q000302:isolation & purification / Q000493:pharmacokinetics*; D006207:Half-Life; D002836:Hemophilia B / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged
D005164:Factor IX