`P.O. Box 1230
`D 35002 Marburg
`www.zlbbehring.com
`
`
`
`Memo
`
`An/To:
`B. Vohwinkel
`S. Schulte
`G. Seemann
`
`Von/From:
`Ernst‐Jürgen Kanzy / Hubert Metzner
`RES & LCM
`Tel.: +49 (0)6421 39 2856 / 39 4417
`Fax: +49 (0)6421 39 4663
`
`
`
`
`
`March 30, 2006
`
`
`Berinert P 10‐fold concentrated (500 U/mL)
`Feasibility / Stability
`
`
`In July 2005 research studies were started evaluating the feasibility of a 10‐fold
`concentrated preparation of Berinert P (C1‐esterase Inhibitor, C1‐Inh), called Berinert P
`10‐fold in the following. Such a concentrated preparation was considered a prerequisite
`for development of a subcutaneous, prophylactic home treatment of C1‐Inh deficient
`patients. Two studies were performed so far and are summarized in this Memo covering
`altogether eight different formulations (Exp. no.: B‐050706SB, B‐050718SB, B‐051209AK).
`
`Materials and Methods
`Different formulations were prepared based on the lyophilisate of a regular Berinert P
`batch (Lot NF3 62111) which was dissolved, concentrated 10‐fold by ultrafiltration in a
`stirred UF‐cell and transferred into various formulations (table 1) by conventional dialysis.
`1 mL‐fillings of concentrated C1‐Inh solutions formulated as indicated in table 1 as well as
`2‐mL‐fillings of semi‐concentrated solutions (diluted 1:2 with WFI) were freeze‐dried
`according to SOP 560498‐02: recipe P5‐02 (Berinert P program) in a controlled lab‐scale
`freeze‐drier. For reconstitution of the lyophilisates 1 mL of WFI was used for each filling
`size to obtain the 10‐fold concentrated product.
`Analysis of reconstituted samples as well as of stability samples was performed using C1‐
`Inhibitor activity measurement and polymer/oligomer determination by size exclusion
`chromatography (SEC) and native polyacrylamide gel electrophoresis (PAGE).
`
`
`Page 1 of 16
`
`CSL EXHIBIT 1008
`
`
`
`ZLB Behring GmbH
`P.O. Box 1230
`D 35002 Marburg
`www.zlbbehring.com
`
`Page: 2
`
`Results
`Freeze‐dried product cakes of the 1mL‐fill sizes were more compact in comparison to
`those of the 2mL‐fill sizes but on the other hand were more prone to cracking. The residual
`moisture of the preparations was in the range of 0.2% to 0.7%, what is very low in
`comparison to regular Berinert P (1.84%, mean value of 35 lots).
`Depending on the formulation, the dissolution times were in the range of 3 to 8 minutes
`and always resulted in colorless and clear solutions.
`SEC‐HPLC as well as native PAGE of the reconstituted samples did not show any enhanced
`aggregate formation of the C1‐Inhibitor due to the concentration or freeze‐drying process,
`respectively. But certain formulations (2, 4, 6, and 7) showed a tendency for the formation
`of bands with higher electrophoretic mobility.
`In general, it can be concluded that a 10‐fold concentration and subsequent freeze‐drying
`of C1‐Inhibitor is technically feasible.
`
`Freeze‐dried samples of formulations 1‐8 were subjected to preliminary stability testing by
`storage of vials at 2°C to 8°C as well as at 40°C for up to 6 months (Exp: no.: B‐050706SB,
`B‐050718SB).
`After 6 months of storage at 2°C to 8°C no difference was detectable compared to samples
`at the beginning of storage regarding the
`inhibitor activity and regarding the
`polymer/oligomer content determined by SEC‐HPLC and PAGE, respectively.
`However, depending on the formulation different degrees of polymer/oligomer formation
`were detected by SEC‐HPLC in samples stored at 40°C (figure 1). In addition, the formation
`of higher molecular weight bands was also observed by PAGE (figure 2). The results
`suggest that higher concentrations of NaCl, the presence of sucrose or an appropriate
`combination of both are favorable with regard to polymer/oligomer formation but that
`polymer/oligomer formation under accelerated conditions cannot be avoided completely.
`No significant loss of activity could be determined upon concurrent testing of the frozen
`(<‐70°C) stability samples stored for 0, 1, 3, and 6 months at 40°C (figure 3). Due to some
`inter‐assay variability of the C1‐Inh assay, results of samples tested on time could not be
`evaluated. As a result of the accelerated storage experiment it can be concluded that
`polymer formation up to the levels detected in these samples do not necessarily cause a
`measurable loss of activity in parallel.
`
`A comparative study of freeze‐dried iso‐osmotic formulation #8* (NaCl‐concentration
`adapted to 4.0 g/L) and regular Berinert P (Exp. no.: B‐051209AK) showed increased
`formation of polymers/oligomers (SEC‐HPLC and PAGE) after 3 months at 40°C in the
`
`Page 2 of 16
`
`
`
`ZLB Behring GmbH
`P.O. Box 1230
`D 35002 Marburg
`www.zlbbehring.com
`
`
`Page: 3
`
`increased formation of
`concentrated formulation (figure 4 and 5). Whether this
`polymers/oligomers is due to the higher protein concentration and whether these are also
`formed in long‐term stability studies at 2‐8°C storage temperature will have to be
`evaluated in additional experiments.
`
`Iso‐osmotic formulation #8* also was stored as a liquid preparation at 2‐8°C, 25°C and
`35°C for stability testing. After 3 months storage at 35°C an increased polymer/oligomer
`formation (figure 6 and 7) accompanied with a significant loss (~70%) of C1‐Inh activity
`(figure 8) was detected. Therefore, it is assumed that significant efforts and real time
`storage data would be needed for the development of an appropriate liquid formulation.
`
`Comparative pharmacokinetic studies in rabbits using 10‐fold concentrated samples of
`freeze‐dried formulation #1 and #8* and regular Berinert P were performed by
`PDS/Pharmacology and Toxicology.
`The results of the first study with formulation #1 and Berinert P as a control (Study no.:
`PSK 06/05) showed that the courses of the plasma levels versus time were very similar
`(figure 9). It was concluded that the 10‐fold concentrated formulation and the regular
`Berinert P are equally well resorbed from the subcutaneous space.
`The data of the second study (Exp. no. PSK 12/06, formulation #8* versus Berinert P) were
`statistically analyzed. Both products were absorbed at equal rates from the subcutaneous
`space (figure 10). The extent of absorption was slightly lower for the new formulation #8*:
`The average dose‐adjusted AUC of Berinert® P 10‐fold was about 15 % lower than the AUC
`of the standard formulation. However, this difference of absorption was not statistically
`significant (p‐value of 0.33) and just may represent the regular variance of the model. It is
`therefore concluded that the bioavailability of the 10‐fold concentrated product does not
`differ from present Berinert® P.
`
`Conclusions
`The results of the study demonstrate that 10‐fold concentrated formulations of Berinert P
`of 500 U/mL after reconstitution can be prepared and that reasonably well soluble
`products are obtained. Due to the better appearance of the lyophilisate the 2 mL filling
`size is currently preferred. Stability of different freeze‐dried formulations up to 6 months
`under accelerated conditions with regard to C1‐inhibitor activity could be demonstrated.
`However, a certain increase of the polymer/oligomer content was obtained for the
`concentrated formulations. Whether such polymers/oligomers will also be formed at 2‐8°C
`upon long‐term storage is not yet known.
`
`
`
`Page 3 of 16
`
`
`
`ZLB Behring GmbH
`P.O. Box 1230
`D 35002 Marburg
`www.zlbbehring.com
`
`
`Page: 4
`
`
`Comparative studies on pharmacokinetics after subcutaneous application showed a
`comparable bioavailability of regular Berinert® P and 10‐fold concentrated formulations.
`
`
`
`
`Ernst‐Jürgen Kanzy / Hubert Metzner
`
`
`
`Page 4 of 16
`
`
`
`ZLB Behring GmbH
`P.O. Box 1230
`D 35002 Marburg
`www.zlbbehring.com
`
`
`
`
`
`Table 1: Formulations of 10‐fold concentrated Berinert P
`
`
`
`
`
`Formulation
`
`
`
`
`
`
`
`g/L
`NaCl
`
`g/L
`Glycine
`
`g/L
`Na3citrate x 2H2O
`
`g/L
`Histidine
`
`g/L
`Arginine x HCl
`
`g/L
`Sucrose
`
`
`pH
`Calculated osmolality mOsmol/L
`Study no.
`
`
`
`
`
`
`1
`(regular formulation)
`8.5
`10.0
`3.5
`
`
`
`7.0
`470
`
`2
`
`3
`
`4
`
`5
`
`6
`
`7
`
`8
`
`8*
`
`
`8.5
`
`10.0
`10.0
`10.0
`3.5
`
`3.5
`
`10
`
`2.1
`
`
`
`
`
`7.0
`7.0
`7.0
`170
`485
`180
`B-050706SB
`
`3.0
`10.0
`3.5
`
`
`10.0
`7.0
`310
`
`
`
`
`10
`2.1
`50.0
`7.0
`230
`
`
`
`3.5
`
`2.1
`50.0
`7.0
`220
`
`4.0
`3.0
`10.0
`10.0
`3.5
`3.5
`
`
`
`
`
`
`7.0
`7.0
`300
`280
`B-050718SB B-051209AK
`
`Page 5 of 16
`
`
`
`ZLB mm"
`P.0. Box 1230
`D 35002 Mill-'3
`mzlhhdwigm
`
`ZLB Behring
`
`Figure 1:
`
`Accelerated stability study of Berinert P 10—fold, formulations #1 to #8, 2mL—fill sizes;
`content of polymers/oligomers after storage at 40'C determined by SEC-HPLC
`nun—Inn.
`“mom
`nine-c
`sommmsnn-monu-
`
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`
`
`
`
`
`ZLB Bailing Gull"
`9.0. Box 1230
`D 35002 Mann-g
`wwwzlbbduirgcom
`
`ZLB Behring
`
`Figure 2:
`
`Accelerated stability study of Berinert P 10—fold, formulations #1 to #8, 2mL-fill sizes;
`protein band patterns (PAGE) after storage for 6 months at 40'C.
`
`lmL/hnL SIM) 5:01:
`
`I
`
`
`
`ZLB Delirium"
`P.0. Box 1230
`D 35002 Marlin
`MIIWCGII
`
`ZLB Behring
`
`Figure 3:
`
`Accelerated stability study of Berinert P 10—fold, formulations #1 to #8, 2mL—fill sizes;
`Cl-lnhibitor activity after storage at 40'C (concurrent analysis of frozen samples at the end of the 6 months storage period).
`
`ml,“
`“mom'-
`film‘“
`A“ ("mill-II»
`
`
`
`WV“)
`
`
`
`ZLB Behring mu
`v.0. Box 1230
`D 35002 Mam-g
`maximum
`
`ZLB Behring
`
`Figure 4.
`
`Comparative stability study of Berinert P 10-fold (formulation #8‘) and regular Berinert P;
`content of polymers/oligamers after storage at 40'C determined by SEC-HPLC
`
`
`
`
`
`ZLBBdl'IuGIIIIH
`P.0. 3011230
`D 35002 Marbug
`MJWM
`
`ZLB Behring
`
`Page: 10
`
`Figure 5:
`
`Comparative stability study of Berinert P 10-fold (formulation 88‘) and regular Berinert P;
`protein band patterns (PAGE) after storage for 3 months at 40'C.
`
`
`
`I.
`
`I234JITIIII
`
`
`
`Accelerated stability study of liquid Berinert P 10‐fold (formulation #8*);
`content of polymers/oligomers after storage at 2‐8°C, 25°C and 35°C determined by SEC‐HPLC
`
`Berinert P s.c. 500 IU/mL
`OpNo. B-051205AK-01
`Liquid / Stability
`SEC HPLC TSK 3000 SWXL HMW + Oligomers
`
`2-8
`25
`35
`
`ZLB Behring GmbH
`P.O. Box 1230
`D 35002 Marburg
`www.zlbbehring.com
`
`
`Page: 11
`
`Figure 6:
`
`50
`
`40
`
`30
`
`20
`
`10
`
`HMW + Oligomers (%)
`
`0
`
`0
`
`3
`
`6
`
`9
`
`12
`
`15
`
`t (months)
`
`18
`
`21
`
`24
`
`27
`
`
`
`
`
`Page 11 of 16
`
`
`
`ZLBBell'IuGIIIIH
`PVOV 3011230
`D 35002 Marbug
`mzlbhehliewm
`
`ZLB Behring
`
`Page: 12
`
`Figure 7:
`
`Accelerated stability study of liquid Berinert P 10-fold (formulation #8');
`protein band patterns (PAGE) after storage for 3 months at 2-8'C, 25'C and 35'C
`
`
`
`LII
`
`Illdil‘IIDII
`
`
`
`ZLB aching mu
`to. Box 1230
`I) 35002 Mam-g
`MIMI»!!-
`
`ZLB Behring
`
`Page: 13
`
`Figure 8:
`
`Accelerated stability study of liquid Berinert P 10—fold (formulation #8‘);
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`P.0. Box 1230
`D 35002 Mann;
`wwwzlbhduilgcom
`
`ZLB Behring
`
`Page: 14
`
`Figure 9:
`
`Study on the pharmacokinetics of Berinert P and Berinert P 10—fold (formulation #1);
`(II-Inhibitor plasma levels (96 of baseline)
`
`+Group I: Berinert P 200 U/kg s.c.
`
`*Group II: Bel-inert P ten fold 200 U/kg s.(.
`
`400
`350
`
`300
`
`250
`
`200
`
`150
`
`100
`
`50
`
`0
`
`
`
`“/0ofBaseline(ClINH)
`
`0
`
`20
`
`40
`
`60
`
`80 100120140160180
`
`Hours
`
`
`
`zm Beh'mg Gull"
`9.0. Box 1230
`D 35002 Mann;
`wwwzlbhdflilgcom
`
`ZLB Behring
`
`Page: 15
`
`Figure 10:
`
`Study on the pharmaookinetia; of Berinert P and Berinert P 10—fold (formulation #8');
`(II-Inhibitor plasma levels (% of norm), dose adjusted
`
`
`
`
`
`n—lelpl: Berinnl’zoo [Mtg 54'.
`
`w-Glm ll: Belimnl’ tenfold 200 Ulkg s.c.
`
` 0
`
`20
`
`40
`
`60
`
`80
`
`100
`
`120
`
`140
`
`160
`
`180
`
`Homs
`
`
`
`From:
`
`To:
`Cc:
`Subject:
`Date:
`Attachments:
`
`IMCEAEX- O=CSL OU=EUADMINGRP CN=RECIPIENTS CN=ERNST-
`JUERGEN+2EKANZY@eurprd04.prod.outlook.com
`Bernhard.Vohwinkel@zlbbehring.com; Stefan.Schulte@cslbehring.com; Gerhard.Seemann@cslbehring.com
`Hubert.Metzner@cslbehring.com
`Memo: Berinert 10-fold; Feasibility/Stability
`Friday, March 31, 2006 2:39:59 AM
`Memo 060330.doc
`
`Hallo zusammen,
`
`in der Anlage das Memo zu Berinert 10-fold concentratet, in dem die bisherigen Ergebnisse zur
`technischen Machbarkeit und Stabilität zusammengefasst sind.
`
`
`
`Beste Grüße
`
`Ernst-Jürgen Kanzy
`
`
`
`Page 16 of 16
`
`