A Phase 3b Continuation Study of the Safety and Efficacy of PEGylated Recombinant Factor VIII (PEG-rFVIII; BAX 855) in Prophylaxis of Bleeding in Previously Treated Patients With Severe Hemophilia A
Phase: PHASE3
Conditions: Hemophilia A
Sponsor: Baxalta now part of Shire

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CLINICAL STUDY PROTOCOL
PRODUCT: BAX 855
STUDY TITLE: A Phase 3b Continuation study of the Safety and Efficacy of 
PEGylated Recombinant Factor VIII (PEG-rFVIII; BAX 855) in Prophylaxis of 
Bleeding in Previously Treated Patients with Severe Hemophilia A
STUDY SHORT TITLE: BAX 855 Continuation
PROTOCOL IDENTIFIER: 261302
CLINICAL TRIAL PHASE 3b
AMENDMENT 4: 2014 MAY 23 (GLOBAL)
Replaces: AMENDMENT 3: 2014 MAR 21 (GERMANY)
AMENDMENT 1: 2013 OCT 02 (GLOBAL)
ALL VERSIONS:
AMENDMENT 3: 2014 MAR 21 (GERMANY)
AMENDMENT 2: 2013 OCT 22 (RUSSIA)
AMENDMENT 1: 2013 OCT 02 (GLOBAL)
Original: 2013 JUN 18 (GLOBAL)
OTHER ID(s)
NCT Number: NCT01945593
EudraCT Number: NCT01945593
IND NUMBER: 15299
Study Sponsor(s):
Baxter Healthcare 
Corporation
One Baxter Way
Westlake Village, CA  91362
Baxter Innovations GmbH
Industriestrasse 67
A-1221 Vienna, AUSTRIA 

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1. STUDY PERSONNEL
1.1 Authorized Representative (Signatory) / Responsible Party
Barbara Valenta-Singer, MD
 Clinical Development
Baxter Healthcare Corporation
1.2 Study Organization
The name and contact information of the responsible party and individuals involved with 
the study (eg, investigator(s), sponsor’s medical expert and study monitor, sponsor’s 
representative(s), laboratories, steering committees, and oversight committees [including 
ethics committees (ECs)], as applicable) will be maintained by the sponsor and provided 
to the investigator.
PPD

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2. SERIOUS ADVERSE EVENT REPORTING
The investigator will comply with applicable laws/requirements for reporting serious 
adverse events (SAEs) to the ECs. 
ALL SAEs ARE TO BE REPORTED ON THE 
SERIOUS ADVERSE EVENT REPORT (SAER) FORM AND 
TRANSMITTED TO THE SPONSOR 
WITHIN 24 HOURS AFTER BECOMING AWARE OF THE EVENT
See SAER form for contact information. 
Further details are also available in the study team roster.
For definitions and information on the assessment of these events, refer to the following:
AE, Section 12.1
SAE, Section 12.1.1.1
Assessment of AEs, Section 12.1.2

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3. SYNOPSIS 
INVESTIGATIONAL PRODUCT
Name of Investigational Product (IP)
BAX 855 
Name(s) of Active Ingredient(s)
PEGylated recombinant factor VIII (PEG-rFVIII)
CLINICAL CONDITION(S)/INDICATION(S)
Previously treated patients (PTPs) with severe hemophilia A (FVIII <1%)
PROTOCOL ID
261302
PROTOCOL TITLE
A Phase 3b Continuation study of the Safety and Efficacy of PEGylated 
Recombinant Factor VIII (PEG-rFVIII; BAX 855) in Prophylaxis of Bleeding 
in Previously Treated Patients with Severe Hemophilia A
Short Title
BAX 855 Continuation
STUDY PHASE
Phase 3b
PLANNED STUDY PERIOD
Initiation
2013 OCT
Primary Completion
2017 Q4
Study Completion
2017 Q4
Duration
The overall duration of the study is estimated to be approximately 4 years from 
study initiation to last subject last visit.
STUDY OBJECTIVES AND PURPOSE
Study Purpose

To continue the evaluation of the safety and efficacy of BAX 855 for prophylaxis and treatment of 
bleeding episodes in adult and pediatric PTPs aged ≤75 years of age with severe hemophilia A.
Primary Objective
The co-primary objectives of the study are: 
1.
To determine the safety of BAX 855 based on the incidence of FVIII inhibitory antibody 
development
2.
To determine the efficacy of BAX 855 based on the annualized bleed rate (ABR) of spontaneous 
bleeding episodes
Secondary Objective(s)
Efficacy
1.
To determine the total ABR (spontaneous and traumatic bleeding episodes) 
2.
To determine the overall hemostatic efficacy rating of BAX 855 for treatment of breakthrough 
bleeding episodes
3.
To determine the length of intervals between bleeding episodes
4.
To characterize the hemostatic efficacy of BAX 855 for treatment of bleeding episodes by the 
number of BAX 855 infusions for treatment
5.
To determine total weight-adjusted consumption of BAX 855 for prophylaxis and for treatment of 
bleeding episodes
6.
To assess Patient Reported Outcomes (PROs) over time for subjects receiving BAX 855

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Safety
1.
To determine the safety of BAX 855, as assessed by the occurrence of adverse events (AEs) and 
changes in vital signs and clinical laboratory parameters 
2.
To determine the immunogenicity of BAX 855
Exploratory Objective

To assess patient satisfaction, patient activity levels, and health resource use over time for subjects 
receiving BAX 855 

To determine the potential correlation between thrombin generation assay (TGA) parameters, 
FVIII trough levels and ABR
STUDY DESIGN
Study Type/ 
Classification/ 
Discipline
Safety and Efficacy
Control Type
No Control
Study Indication Type
Prevention and Treatment
Intervention model 
Parallel
Blinding/Masking
Open-label
Study Design
This is a phase 3b, prospective, open label, multi-center study to evaluate the 
safety and efficacy of BAX 855 for prophylactic use and the control of bleeding 
episodes in approximately 200 pediatric and adult PTPs ≤75 years of age with 
severe hemophilia A. The study plans to include subjects from other BAX 855 
studies and BAX 855-naïve subjects. 
Subjects will receive either a fixed dose prophylaxis with BAX 855 consisting 
of 45 ± 5 IU/kg for subjects aged ≥ 12 years or 50 ± 10 IU/kg for subjects aged 
< 12 years twice weekly or, subjects can decide to receive a 
pharmacokinetically-tailored (PK-tailored) prophylactic BAX 855 dosing 
regimen based on the subject’s individual PK to maintain FVIII trough levels of 
≥3%. The frequency of PK-tailored prophylactic BAX 855 dosing will be at 
least twice weekly.
Planned Duration of 
Subject Participation
Each subject will participate in the study until a total of at least 100 exposure 
days (EDs) to BAX 855 has been achieved (accumulated across all BAX 855 
studies in which each subject participated). 
Depending on the subject’s BAX 855 exposure history and treatment regimen 
given, the planned duration of subject participation to reach the 100 EDs can
vary from approximately 3 to 12 months. However, extension of the study 
duration for individual subjects beyond the 100 EDs may be granted.
Primary Outcome Measure 
Safety: Development of inhibitory antibodies to FVIII
Efficacy: Spontaneous ABR
Secondary Outcome Measure(s)
Efficacy
1.
Total ABR (spontaneous and traumatic bleeding episodes)
2.
Overall hemostatic efficacy rating of BAX 855 for treatment of breakthrough bleeding episodes
3.
Number of BAX 855 infusions to treat bleeding episodes

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4.
Time intervals between bleeding episodes
5.
Weight-adjusted consumption of BAX 855
Safety 
1.
Occurrence of AEs and serious adverse events (SAEs)
2.
Changes in vital signs and clinical laboratory parameters (hematology, clinical chemistry, and 
lipids)
3.
Immunogenicity
a.
Binding antibodies (IgG and IgM) to FVIII, BAX 855, and PEG
b.
Anti-Chinese hamster ovary (CHO) antibodies
Patient Reported Outcomes (PROs)
Changes from baseline in parent study, if applicable, in the following:
1.
Bleed and pain severity as measured using the Haemo-SYM questionnaire
2.
Health-related quality of life (HRQoL) as assessed using the SF-36/PedsQL questionnaires
Exploratory Outcome Measure(s)
1.
Patient satisfaction with treatment will be assessed using the Satisfaction Question Set
2.
Patient Activity Level
3.
Health resource use data (eg, physician office visits, hospitalizations, days missed from 
work/school)
4.
TGA parameters, FVIII trough levels and ABR
INVESTIGATIONAL PRODUCT(S), DOSE AND MODE OF ADMINISTRATION
Active Product 
BAX 855
Dosage form: injection, powder, lyophilized, for solution.
Dosage frequency: 
Fixed prophylactic regimen:
o Subjects aged ≥ 12 years:
45 ± 5 IU/kg twice weekly, which 
may be increased up to 80 IU/kg
o Subjects aged < 12 years:
50 ± 10 IU/kg twice weekly, which 
may be increased up to 80 IU/kg
OR
PK-tailored prophylactic BAX 855 regimen based on subject’s 
individual PK profile to maintain a FVIII trough level of ≥3%. 
However, the dosing regimen should not exceed 80 IU/kg for any single 
infusion and the FVIII peak levels should not exceed 200%.
Mode of Administration: intravenous bolus infusion
SUBJECT SELECTION 
Targeted Accrual
Approximately 250 PTPs with severe hemophilia A.
Number of 
Groups/Arms/Cohorts
Two: Fixed BAX 855 prophylaxis or PK-tailored BAX 855 prophylaxis

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Inclusion Criteria
Subjects transitioning from other BAX 855 studies
Subjects transitioning from other BAX 855 studies who meet ALL of the following criteria are eligible for 
this study:
1.
Subject has completed a previous BAX 855 study and is willing to immediately transition into this 
continuation study.i
2.
Subject is ≤75 years of age at screening of the previous BAX 855 study. 
3.
Subject continues to have a Karnofsky (for subjects aged ≥ 16 years) or Lansky (for subjects aged 
< 16 years) performance score of ≥ 60 (see Section 20.5).
4.
Subject is human immunodeficiency virus negative (HIV-); or HIV+ with stable disease and 
CD4+ count ≥ 200 cells/mm3, as confirmed by central laboratory at screening. 
5.
Subject is hepatitis C virus negative (HCV-) by antibody or PCR testing (if positive, antibody titer 
will be confirmed by PCR), as confirmed by central laboratory at screening; or HCV+ with 
chronic stable hepatitis.
6.
If female of childbearing potential, subject presents with a negative urine pregnancy test and 
agrees to employ adequate birth control measures for the duration of the study.
7.
Subject and/or legally authorized representative is willing and able to comply with the 
requirements of the protocol.
BAX 855 naïve subjects
BAX 855 naïve subjects who are ≥ 12 years of age can only be enrolled in this continuation study after 
enrollment in the phase 2/3 pivotal study is closed. BAX 855 naïve subjects who are < 12 years of age can 
only be enrolled in this continuation study after enrollment in the pediatric PTP study is closed.
Enrolment of BAX 855 naïve subjects will only start once the sponsor has notified the study sites 
accordingly.
BAX 855 naïve subjects who meet ALL of the following criteria are eligible for this study:
1.
Subject is ≤75 years of age at screening.
2.
Subject is naïve to BAX 855.
3.
Subject has severe hemophilia A (FVIII clotting activity < 1%) as confirmed by central laboratory 
at screening after at least a 72-hour washout period.ii
4.
Subject aged ≥ 6 years has documented previous treatment with plasma-derived FVIII 
concentrates or rFVIII for ≥ 150 EDs. 
5.
Subject aged < 6 years has documented previous treatment with plasma-derived FVIII 
concentrates or rFVIII for ≥ 50 EDs.
6.
Subject is currently receiving prophylaxis or on-demand therapy with FVIII.
                                                
i
NOTE: Subjects who have received FVIII concentrates other than BAX 855 following completion of 
the previous BAX 855 study are excluded from participation in this continuation study.
ii
If FVIII activity is ≥1%, severe hemophilia A classification can be confirmed by historically 
documented FVIII clotting activity < 1% performed by a certified clinical laboratory or by a 
documented genotype known to result in severe hemophilia A. 

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7.
Subject has a Karnofsky (for subjects aged ≥ 16 years) or Lansky (for subjects aged < 16 years) 
performance score of ≥ 60 (see Section 20.5).
8.
Subject is HIV-; or HIV+ with stable disease and CD4+ count ≥ 200 cells/mm3, as confirmed by 
central laboratory at screening. 
9.
Subject is HCV- by antibody or PCR testing (if positive, antibody titer will be confirmed by PCR), 
as confirmed by central laboratory at screening; or HCV+ with chronic stable hepatitis.
10. If female of childbearing potential, subject presents with a negative urine pregnancy test and 
agrees to employ adequate birth control measures for the duration of the study.
11. Subject and/or legally authorized representative is willing and able to comply with the 
requirements of the protocol.
Exclusion Criteria
Subjects transitioning from other BAX 855 studies
Subjects transitioning from other BAX 855 studies who meet ANY of the following criteria are not eligible 
for this study:
1.
Subject had detectable FVIII inhibitory antibodies (≥ 0.6 BU using the Nijmegen modification of 
the Bethesda assay) as confirmed by central laboratory at screening.
2.
Subject has developed FVIII inhibitory antibodies (≥ 0.6 BU using the Nijmegen modification of 
the Bethesda assay as determined at central laboratory in a previous BAX 855 study).
3.
Subject has acquired a hemostatic defect other than hemophilia A (eg, qualitative platelet defect or 
von Willebrand’s disease) in a previous BAX 855 study.
4.
Subject has severe chronic hepatic dysfunction (eg, ≥ 5 times upper limit of normal alanine 
aminotransferase [ALT], as confirmed by central laboratory at screening).
5.
Subject has severe renal impairment (serum creatinine > 2.0 mg/dL), as confirmed by central 
laboratory at screening.
6.
Subject experienced a life-threatening or gastrointestinal bleeding episode within 3 months prior 
to study entry.
7.
Subject is scheduled to use other PEGylated drugs during study participation. 
8.
Subject is planning to take part in any other clinical study during the course of the continuation 
study, with the exception of any other parallel BAX 855 study.
9.
Subject has medical, psychiatric, or cognitive illness or recreational drug/alcohol use that, in the 
opinion of the investigator, would affect subject safety or compliance.
10. Subject is a family member or employee of the investigator.
BAX 855 naïve subjects
BAX 855 naïve subjects who meet ANY of the following criteria are not eligible for this study:
1.
Subject has detectable FVIII inhibitory antibodies (≥ 0.6 BU using the Nijmegen modification of 
the Bethesda assay) as confirmed by central laboratory at screening.
2.
Subject has history of FVIII inhibitory antibodies (≥ 0.6 BU using the Nijmegen modification of 
the Bethesda assay or the Bethesda assay) at any time prior to screening.
3.
Subject has been diagnosed with an inherited or acquired hemostatic defect other than hemophilia 
A (eg, qualitative platelet defect or von Willebrand’s disease).
4.
Subject has known hypersensitivity towards mouse or hamster proteins, PEG, or Tween 80.

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5.
Subject has severe chronic hepatic dysfunction (eg, ≥ 5 times upper limit of normal ALT, as 
confirmed by central laboratory at screening).
6.
Subject has severe renal impairment (serum creatinine > 2.0 mg/dL), as confirmed by central 
laboratory at screening.
7.
Subject experienced a life-threatening or gastrointestinal bleeding episode within 3 months prior 
to study entry.
8.
Subject has current or recent (< 30 days) use of other PEGylated drugs prior to study participation 
or scheduled use of such drugs during study participation. 
9.
Subject has participated in another clinical study involving an IP other than BAX 855 or device 
within 30 days prior to enrollment or is scheduled to participate in another clinical study involving 
an IP or investigational device during the course of this study.
10. Subject has medical, psychiatric, or cognitive illness or recreational drug/alcohol use that, in the 
opinion of the investigator, would affect subject safety or compliance.
11. Subject is a family member or employee of the investigator.
STATISTICAL ANALYSIS
Sample Size Calculation
In total, approximately 250 subjects will be enrolled in this study. This sample size is based on having 
200 evaluable subjects with a minimum of 100 EDs to BAX 855 in accordance with the guidance 
EMA/CHMP/BPWP/144533/2009. 
Planned Statistical Analysis
Analysis of Primary Outcome Measures
Safety:
The number and proportion (Clopper-Pearson exact 95% CI) of subjects having been exposed to BAX 855
who develop inhibitory antibodies to FVIII (≥0.6 BU) will be provided.
Efficacy:
The spontaneous ABR will be assumed to have a negative binomial distribution, and the mean ABR (95% 
CI) will be estimated using a general estimating equation (GEE) model framework (with a logarithmic link 
function which is the default for the negative binomial distribution) with treatment regimen as a fixed 
effect, subject effect as a random effect, age at baseline as a continuous covariate, and the logarithm of 
follow-up time (in years) as an offset.
Analysis of Secondary Outcome Measures
Efficacy:
The total ABR (spontaneous and traumatic bleedings) will be estimated and described similarly as the 
primary efficacy outcome measure.
The efficacy of BAX 855 in the treatment of bleeds will be summarized. It includes overall hemostatic 
efficacy rating at 24 (±2) hours after initiation of treatment and at resolution of bleed, number of BAX 855 
infusions to control bleeding and total weight-adjusted dose per bleeding episode (excluding any infusions 
given to maintain hemostasis after the bleeding was controlled), and time interval between bleeding 
episodes.
Frequency tables will be prepared for the number of BAX 855 infusions required for the treatment of 
bleeding episodes. The median number of infusions (and nonparametric 95% CI) will be estimated. 

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Weight-adjusted consumption of BAX 855 for prophylaxis, treating bleeding episodes (excluding any 
infusions given to maintain hemostasis after the bleeding is controlled) and in total per subject will be 
summarized separately as average number of BAX 855 infusions and average weight-adjusted consumption 
of BAX 855 per month. 
The average time interval between 2 consecutive bleeding episodes will be computed for each subject as 
the duration of the observation period divided by the number of bleeding episodes in the observation 
period. The median (95% CI) of those average time intervals between 2 bleeding episodes will be 
estimated.
Pharmacokinetics:
For subjects undergoing a pharmacokinetic (PK) assessment in this study, the following PK parameters for 
FVIII will be reported using descriptive statistics: area under the plasma concentration curve from 0 to 
infinity (AUC0-∞), half-life (T1/2), mean residence time (MRT), total body clearance (CL), incremental 
recovery over time (IR), maximal plasma concentration (Cmax), and volume of distribution at steady state 
(Vss). 
For subjects undergoing a PK assessment in this study, an exploratory analysis of correlation of baseline 
von Willebrand factor (VWF) antigen to BAX 855 PK will be performed as well as the possible influence 
of any anti-PEG antibodies (preexisting or detected during study participation) on the PK of BAX 855, if 
applicable.
IR will be summarized by visit and displayed graphically over time for each subject. Also the change from 
the baseline will be described using summary statistics.
Safety:
Frequency counts and percentages will be calculated for SAEs, occurrence of inhibitory antibodies to 
FVIII, occurrence of binding antibodies to FVIII, BAX 855, PEG, occurrence of anti-CHO antibodies, 
occurrence of severe allergic reactions, and occurrence of thrombotic events. 
AEs that occurred during or after treatment will be presented in summary tables. AEs will be cross-
tabulated for relatedness, seriousness, and severity. AEs will be categorized according to the MedDRA 
dictionary and summarized by system organ class and preferred term. 
Vital signs and laboratory parameters will be characterized descriptively. Shift tables will be prepared for 
laboratory parameters. Clinically significant abnormal values in routine laboratory parameters (hematology, 
clinical chemistry, lipids) and vital signs will be summarized.
Patient Reported Outcomes (PROs):
Bleed and pain severity will be measured using the Haemo-SYM questionnaire with higher scores on the 
Haemo-SYM indicating more severe symptoms. Changes from baseline in the Haemo-SYM scores will be 
tested for statistical significance using a Wilcoxon test for paired samples. Number and proportion of 
subjects with an improvement in the Haemo-SYM pain subscale will be tabulated. 
HRQoL will be measured using the SF-36 questionnaire with lower scores on SF-36 indicating worse 
HRQoL. Changes from baseline in the SF-36 scores will be tested for statistical significance using a 
Wilcoxon test for paired samples. The number and proportion of subjects with an improvement in SF-36 
will be tabulated.

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HRQoL in subjects aged < 14 years will be measured using the PedsQL with lower scores on the PedsQL 
indicating worse HRQoL. Changes from baseline to end of study in the PedsQL scores will be tested for 
statistical significance using a Wilcoxon test for paired samples. Number and proportion of subjects with an 
improvement in the PedsQL will be tabulated.
Analysis of Exploratory Outcome Measures
Patient satisfaction with treatment, patient activity level and health resource use data will be descriptively 
summarized and listed.
TGA parameters (lag time, time to peak thrombin generation, peak thrombin generation, and endogenous 
thrombin potential [ETP]) will be presented descriptively and displayed graphically. The potential 
influence of TGA parameters and FVIII trough levels on ABR in the three months after TGA/FVIII trough 
level measurement will be explored by scatterplots where TGA is performed.
Interim Safety Reviews
A first interim safety review will be performed for marketing authorization application to the European 
Medicines Agency (EMA).
If applicable, a second interim safety review may be performed once 200 subjects have accumulated at least 
100 EDs to BAX 855.

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4. TABLE OF CONTENTS
1. STUDY PERSONNEL ................................................................................................. 2
1.1 Authorized Representative (Signatory) / Responsible Party .............................. 2
1.2 Study Organization................................................................................................. 2
2. SERIOUS ADVERSE EVENT REPORTING........................................................... 3
3. SYNOPSIS..................................................................................................................... 4
4. TABLE OF CONTENTS ........................................................................................... 12
5. LIST OF ABBREVIATIONS .................................................................................... 18
6. BACKGROUND INFORMATION .......................................................................... 21
6.1 Description of Investigational Product ............................................................... 21
6.2 Clinical Condition/Indication .............................................................................. 24
6.3 Population To Be Studied..................................................................................... 25
6.4 Findings from Nonclinical and Clinical Studies................................................. 25
6.4.1 Findings from Nonclinical Studies ............................................................... 25
6.4.2 Findings from Clinical Studies ..................................................................... 26
6.5 Evaluation of Anticipated Risks and Benefits of the Investigational Product(s) 
to Human Subjects................................................................................................ 27
6.6 Compliance Statement.......................................................................................... 28
7. STUDY PURPOSE AND OBJECTIVES ................................................................. 28
7.1 Study Purpose ....................................................................................................... 28
7.2 Primary Objectives............................................................................................... 29
7.3 Secondary Objectives ........................................................................................... 29
7.3.1 Efficacy ........................................................................................................... 29
7.3.2 Safety............................................................................................................... 29
7.4 Exploratory Objectives......................................................................................... 29
8. STUDY DESIGN......................................................................................................... 29
8.1 Brief Summary...................................................................................................... 29
8.2 Overall Study Design............................................................................................ 30
8.3 Duration of Study Period(s) and Subject Participation .................................... 31
8.4 Outcome Measures ............................................................................................... 32
8.4.1 Primary Outcome Measures......................................................................... 32
8.4.1.1 Safety........................................................................................................ 32
8.4.1.2 Efficacy .................................................................................................... 32

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8.4.2 Secondary Outcome Measures ..................................................................... 32
8.4.2.1 Efficacy .................................................................................................... 32
8.4.2.2 Safety........................................................................................................ 32
8.4.2.3 Patient Reported Outcomes................................................................... 33
8.4.3 Exploratory Outcomes Measure .................................................................. 33
8.5 Randomization and Blinding............................................................................... 33
8.6 Study Stopping Rules............................................................................................ 33
8.7 Investigational Product(s).................................................................................... 33
8.7.1 Packaging, Labeling, and Storage................................................................ 33
8.7.2 Administration ............................................................................................... 34
8.7.3 Description of Treatment.............................................................................. 35
8.7.3.1 Fixed Dose Prophylactic Treatment Regimen ..................................... 35
8.7.3.2 BAX 855 Dose and/or Frequency Adjustments for Subjects on Fixed 
Dose Prophylactic Treatment Regimen................................................ 36
8.7.3.3 PK-Tailored Prophylactic Treatment Regimen................................... 37
8.7.3.4 BAX 855 Dose and/or Frequency Adjustments for Subjects on PK-
Tailored Prophylactic Treatment Regimen.......................................... 38
8.7.3.5 Treatment of Bleeding Episodes............................................................ 38
8.7.3.6 Immune Tolerance Induction for Inhibitor Development.................. 40
8.7.4 Treatment for Surgery or Dental Procedures............................................. 40
8.7.5 . Investigational Product Accountability..................................................... 41
8.8 Source Data ........................................................................................................... 42
9. SUBJECT SELECTION, WITHDRAWAL, AND DISCONTINUATION .......... 42
9.1 Inclusion Criteria.................................................................................................. 42
9.1.1 Subjects Transitioning from Other BAX 855 Studies................................ 42
9.1.2 BAX 855 Naïve Subjects................................................................................ 43
9.2 Exclusion Criteria................................................................................................. 44
9.2.1 Subjects Transitioning from Other BAX 855 Studies................................ 44
9.2.2 BAX 855 Naïve Subjects................................................................................ 45
9.3 Withdrawal and Discontinuation ........................................................................ 46
10. STUDY PROCEDURES .......................................................................................... 47
10.1 Informed Consent and Enrollment ................................................................... 47
10.2 Subject Identification Code................................................................................ 47
10.3 Screening and Study Visits................................................................................. 47
10.3.1 Subjects Transitioning from Other BAX 855 Studies.............................. 48
10.3.2 BAX 855 Naïve Subjects.............................................................................. 49
10.4 Medications and Non-Drug Therapies.............................................................. 49
10.5 Subject Diary and Patient Reported Outcomes............................................... 50
10.5.1 Subject Diary................................................................................................ 50
10.5.2 Patient Reported Outcomes........................................................................ 51
10.6 Subject Completion/Discontinuation ................................................................ 53
10.7 Procedures for Monitoring Subject Compliance............................................. 54

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11. ASSESSMENT OF EFFICACY.............................................................................. 54
11.1 Annualized Bleed Rate (ABR) ........................................................................... 54
11.2 Overall Hemostatic Efficacy Rating of BAX 855 for the Treatment of 
Bleeding Episodes ................................................................................................. 54
11.3 Number of BAX 855 Infusions Needed for the Treatment of Bleeding 
Episodes ................................................................................................................. 56
11.4 Time Intervals Between Bleeding Episodes...................................................... 56
11.5 Weight-Adjusted Consumption of BAX 855 .................................................... 56
12. ASSESSMENT OF SAFETY................................................................................... 56
12.1 Adverse Events.................................................................................................... 56
12.1.1 Definitions..................................................................................................... 56
12.1.1.1 Serious Adverse Event.......................................................................... 56
12.1.1.2 Non-Serious Adverse Event ................................................................. 57
12.1.1.3 Unexpected Adverse Events................................................................. 57
12.1.1.4 Preexisting Diseases.............................................................................. 58
12.1.2 Assessment of Adverse Events.................................................................... 58
12.1.2.1 Severity .................................................................................................. 59
12.1.2.2 Causality................................................................................................ 60
12.2 Urgent Safety Measures ..................................................................................... 61
12.3 Untoward Medical Occurrences........................................................................ 61
12.4 Non-Medical Complaints ................................................................................... 62
12.5 Medical, Medication, and Non-Drug Therapy History................................... 63
12.6 Physical Examinations........................................................................................ 63
12.7 Clinical Laboratory Parameters........................................................................ 63
12.7.1 Hematology, Clinical Chemistry and Lipid Panel.................................... 64
12.7.2 Blood Type.................................................................................................... 64
12.7.3 Gene mutations and human leukocyte antigen (HLA) genotype ............ 64
12.7.4 Factor VIII Activity, FVIII and VWF Antigen......................................... 64
12.7.4.1 Pharmacokinetic Evaluation for PK-Tailored Dosing...................... 65
12.7.4.2 Determination of FVIII Activity Trough Levels................................ 66
12.7.4.3 Determination of Incremental Recovery ............................................ 66
12.7.5 TGA Testing................................................................................................. 67
12.7.6 Immunogenicity Assays............................................................................... 67
12.7.7 Viral Serology............................................................................................... 68
12.7.8 Assessment of Laboratory Values .............................................................. 68
12.7.8.1 Assessment of Abnormal Laboratory Values..................................... 68
12.7.9 Biobanking.................................................................................................... 69
12.8 Vital Signs............................................................................................................ 69
13. STATISTICS............................................................................................................. 69
13.1 Sample Size and Power Calculations ................................................................ 69
13.2 Datasets and Analysis Cohorts .......................................................................... 70

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13.2.1 Safety Analysis Set....................................................................................... 70
13.2.2 Full Analysis Set........................................................................................... 70
13.2.3 Per Protocol Analysis Set............................................................................ 70
13.2.4 Analysis Cohorts .......................................................................................... 70
13.3 Handling of Missing, Unused, and Spurious Data........................................... 70
13.4 Methods of Analysis............................................................................................ 70
13.4.1 Primary Outcome Measure......................................................................... 70
13.4.1.1 Primary Safety Outcome Measure...................................................... 70
13.4.1.2 Primary Efficacy Outcome Measure .................................................. 70
13.4.2 Secondary Outcome Measures ................................................................... 71
13.4.2.1 Secondary Efficacy Outcome Measures ............................................. 71
13.4.3 Pharmacokinetics......................................................................................... 71
13.4.4 Secondary Safety Outcome Measures........................................................ 72
13.4.5 Patient Reported Outcomes........................................................................ 72
13.4.5.1 Haemo-SYM.......................................................................................... 72
13.4.5.2 SF-36 ...................................................................................................... 72
13.4.5.3 PedsQL .................................................................................................. 72
13.4.6 Exploratory Outcome Measures ................................................................ 72
13.5 Planned Interim Analysis of the Study ............................................................. 73
14. DIRECT ACCESS TO SOURCE DATA/DOCUMENTS .................................... 73
15. QUALITY CONTROL AND QUALITY ASSURANCE...................................... 73
15.1 Investigator’s Responsibility.............................................................................. 73
15.1.1 Final Clinical Study Report........................................................................ 73
15.2 Training ............................................................................................................... 74
15.3 Monitoring........................................................................................................... 74
15.4 Auditing ............................................................................................................... 74
15.5 Non-Compliance with the Protocol ................................................................... 74
15.6 Laboratory and Reader Standardization ......................................................... 74
16. ETHICS ..................................................................................................................... 75
16.1 Subject Privacy ................................................................................................... 75
16.2 Ethics Committee and Regulatory Authorities................................................ 75
16.3 Informed Consent ............................................................................................... 75
16.4 Data Monitoring Committee.............................................................................. 76
17. DATA HANDLING AND RECORD KEEPING................................................... 76
17.1 Confidentiality Policy ......................................................................................... 76
17.2 Study Documentation and Case Report Forms ............................................... 76
17.3 Document and Data Retention........................................................................... 77

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18. FINANCING AND INSURANCE........................................................................... 77
19. PUBLICATION POLICY........................................................................................ 77
20. SUPPLEMENTS....................................................................................................... 78
20.1 Study Flow Chart................................................................................................ 78
20.2 Flow Diagram of Study Procedures .................................................................. 80
20.2.1 Subjects on Fixed Dose Prophylactic Treatment Regimen...................... 80
20.2.1.1 Screening Visit ...................................................................................... 80
20.2.1.2 ED1 (Baseline):...................................................................................... 82
20.2.1.3 Follow-up Visits .................................................................................... 83
20.2.1.4 End of Study Visit................................................................................. 84
20.2.2 Subjects on PK-Tailored Prophylactic Treatment Regimen................... 86
20.2.2.1 Screening Visit ...................................................................................... 86
20.2.2.2 PK Assessment ...................................................................................... 89
20.2.2.3 Baseline Visit / Start of Prophylaxis.................................................... 90
20.2.2.4 Follow-up Visits: At 4 (± 1) Weeks, 8 (± 1) Weeks, 18 (± 2) Weeks 
from Baseline Visit.................................................................................. 91
20.2.2.5 Follow-up Visits: Every 3 Months (± 2 Weeks) Starting from 
Baseline Visit........................................................................................... 91
20.2.2.6 End of Study Visit................................................................................. 92
20.3 Schedule of Study Procedures and Assessments.............................................. 94
20.3.1 Subjects Transitioning from Other BAX 855 Studies on Fixed Dose 
Prophylactic Treatment Regimen................................................................ 94
20.3.2 BAX 855 Naïve Subjects on Fixed Dose Prophylactic Treatment 
Regimen.......................................................................................................... 96
20.3.3 Subjects on PK-Tailored Prophylactic Treatment Regimen 
(Transitioning and BAX 855 Naïve Subjects)............................................. 98
20.4 Clinical Laboratory Assessments .................................................................... 100
20.4.1 Subjects Transitioning from Other BAX 855 Studies on Fixed Dose 
Prophylactic Treatment Regimen.............................................................. 100
20.4.2 BAX 855 Naïve Subjects on Fixed Dose Prophylactic Treatment 
Regimen........................................................................................................ 102
20.4.3 Subjects on PK-Tailored Prophylactic Treatment Regimen 
(Transitioning and BAX 855 Naïve Subjects)........................................... 104
20.5 Karnofsky and Lansky Scores......................................................................... 106
21. REFERENCES........................................................................................................ 107
22. SUMMARY OF CHANGES.................................................................................. 109

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Tables
Table 1 BAX 855 Clinical Development Program.......................................................... 22
Table 2 BAX 855 Example Dosing Frequency ............................................................... 36
Table 3 BAX 855 Treatment Guidelines for Bleeding Episodes..................................... 39
Table 4 Efficacy Rating Scale for Treatment of Bleeding Episodes at 24 ± 2 Hours from 
the Initiation of Treatment and at Resolution of Bleed............................................. 55
Figures
Figure 1 Study Design for Baxter Clinical Study 261302 ……………………………..78

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5. LIST OF ABBREVIATIONS
Abbreviation
Definition
ABR
annualized bleed rate
AE
adverse event
ALT
alanine aminotransferase (SGPT)
AST 
aspartate aminotransferase (SGOT)
AUC(0-∞)
area under the plasma concentration curve from 0 to infinity
BAX 855
product code name for Baxter’s PEGylated recombinant FVIII (rFVIII)
BU 
Bethesda unit
US CFR 
US Code of Federal Regulations
CHO 
Chinese hamster ovary
CI
confidence interval
CL 
total body clearance 
Cmax 
maximum plasma concentration
(e)CRF 
(electronic) case report form
DMC
data monitoring committee
EC 
ethics committee
ED
exposure day
ELISA
enzyme-linked immunosorbent assay
EMA
European Medicines Agency
ETP
Endogenous thrombin potential
FDA
US Food and Drug Administration
FVIII 
factor VIII
GCP 
Good Clinical Practice
GEE
general estimating equation
HAV
hepatitis A virus
HBcAb
hepatitis B core antibody
HBsAb
hepatitis B surface antibody
HBsAg
hepatitis B surface antigen
HBV
hepatitis B virus
HCV 
hepatitis C virus
HCV Ab
hepatitis C virus antibody
HDL
high density lipoprotein
HIV 
human immunodeficiency virus

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Abbreviation
Definition
HRQoL
health-related quality of life 
IB
Investigator Brochure
ICH 
International Conference on Harmonisation
ICF
informed consent form
IgA
Immunoglobulin A
IgE
Immunoglobulin E
IgG
Immunoglobulin G
IgM
Immunoglobulin M
IP 
investigational product
ITI
immune tolerance induction
IU 
international unit (s)
IR
incremental recovery over time
IQR
Interquartile ranges
i.v.
intravenous(ly)
LDL
low density lipoprotein
MedDRA
Medical Dictionary for Regulatory Activities
Mo
Month
MRT 
mean residence time
NMC
non-medical complaint
PCR
polymerase chain reaction
pdFVIII
plasma-derived factor VIII
PedsQL
Pediatric Quality of Life Inventory
PEG
polyethylene glycol
PK 
pharmacokinetic(s)
PMDA
Pharmaceuticals and Medical Devices Agency
PP
per protocol
PRO
patient reported outcomes
PTP
previously treated patient
PUP
previously untreated patient
q5d
Dose every five (5) days
q7d
Dose every seven (7) days
rFVIII
recombinant factor VIII
SAE 
serious adverse event

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Abbreviation
Definition
SAER 
serious adverse event report
SF-36
Short form-36 questionnaire 
SIC
subject identification code
SWFI 
sterile water for injection
T1/2 
half life
TGA
Thrombin generation assay
Tmax
time to maximum concentration in plasma 
US 
United States
VLDL
very low density lipoprotein
Vss 
volume of distribution at steady state
VWF
von Willebrand Factor

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6. BACKGROUND INFORMATION
6.1 Description of Investigational Product
The investigational product (IP), BAX 855, is a novel polyethylene glycol (PEG)-ylated 
full-length recombinant factor VIII (rFVIII) molecule. BAX 855 is intended for use as a 
FVIII replacement therapy with an extended half-life in the prophylaxis and treatment of 
bleeding events in patients with severe hemophilia A. 
Current management of severe hemophilia A includes on-demand treatment for bleeding 
events and prophylaxis to prevent bleeds.1; 2 The average half-life of current FVIII 
products is in the range of 12-14 hours,3; 4 thus current prophylaxis regimens require 
infusion of FVIII every other day, or every 2 to 3 days when based on the subject’s 
individual pharmacokinetic (PK) profile.5 BAX 855 is characterized by controlled 
PEGylation of full length recombinant FVIII and designed to extend the half-life of 
FVIII. BAX 855 may improve the treatment of hemophilia A by providing the 
opportunity to reduce the frequency of administration during prophylaxis while 
maintaining similar therapeutic benefits to existing FVIII products, improve subject 
convenience and compliance with therapy, and thereby improving overall health 
outcomes. 
The rFVIII of BAX 855 is identical to the full-length albumin/plasma free manufactured 
octocog alfa known as ADVATE. The product is expressed in Chinese hamster ovary 
(CHO). PEG chains (20 kDa) are covalently bound to the rFVIII protein using a stable 
linker. The BAX 855 product is reconstituted with sterile water for injection (SWFI) and 
administered intravenously (i.v.) as a solution by bolus infusion. It uses the same 
stabilizing agents (mannitol, trehalose, histidine, and glutathione) as the parent rFVIII 
product (octocog alfa, ADVATE). Comprehensive preclinical studies as well as a 
successfully completed phase 1 study (Baxter clinical study 261101) have shown that the 
PEGylation extends both the in vivo half-life and the measurable circulating activity of 
the product (as determined by chromogenic and 1-stage clotting assays). Physiochemical 
characterization studies demonstrate that the functional activity of BAX 855 is 
comparable to that of ADVATE. Additional details can be found in the BAX 855 
Investigator Brochure (IB).
The clinical development program for BAX 855 follows the European Medicines Agency 
(EMA) guidance outlined in EMA/CHMP/BPWP/144533/20096 and consists of 
1 completed, 4 ongoing and 2 planned studies (see Table 1). 

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Table 1
BAX 855 Clinical Development Program
Study Number
Type of Study
Criteria for inclusion
Study Status
261101
Phase 1
PTP; 18-65 years
Completed
261201
Pivotal Phase 2/3
PTP; 12-65 years
Ongoing
261202
Pediatric PTP Phase 3
PTP; <12 years
Ongoing
261204
Surgery Phase 3
PTP; participated in other BAX 
855 studies or BAX 855 naïve; 
2-75 years
Ongoing
261302
Continuation Phase 3b
PTP; participated in other BAX 
855 studies or BAX 855 naïve; 
≤75 years
Ongoing
261203
Pediatric PUP Phase 3
PUP; <6 years
Planned
261303
PK-guided Phase 3
PTP; 12-65 years
Planned
A Phase 1 study in previously treated patients (PTPs) aged 18 to 65 years with severe 
hemophilia A (Baxter Clinical Study 261101) to evaluate the safety and PK of BAX 855 
at doses of 30 IU/kg and 60 IU/kg has been completed. The results showed that a single 
infusion of BAX 855 was safe and well tolerated. The terminal half-life was extended 1.4 
to 1.5 fold as compared to ADVATE. 
A Phase 2/3 pivotal study is ongoing since January 2013 (Study 261201) and investigates 
PK properties in 25 subjects of whom at least 6 subjects are adolescents, as well as 
hemostatic efficacy, safety and immunogenicity in approximately 132 PTPs aged 
≥12 years with severe hemophilia A (115 receiving prophylactic treatment and 
17 receiving on-demand treatment) in the control and prophylaxis of bleeding episodes. 
A pediatric study (Study 261202) will evaluate the PK, efficacy, safety, and 
immunogenicity of BAX 855; 60 pediatric subjects (30 subjects aged <6 years and 
30 subjects aged ≥6 to <12 years) with severe hemophilia A will be enrolled to have 
50 evaluable subjects (25 in each age cohort) receiving twice weekly prophylactic 
treatment with 50 ±10 IU/kg of BAX 855 over a period of 6 months or at least 

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50 exposure days (EDs), whichever will occur last. A subset of 28 subjects (14 in each 
age cohort) will participate in the PK portion of the study which will be performed prior 
to the start of prophylactic treatment.
A Phase 3 study to evaluate the efficacy and safety of BAX 855 in the perioperative 
management in subjects undergoing major or minor elective, or minor emergency 
surgical/invasive procedures is currently ongoing (Study 261204). Approximately 
40 PTPs with severe hemophilia A (FVIII <1%) will be enrolled who are expected to 
require approximately 50 major or minor elective or minor emergency surgeries or other 
invasive procedures. At least 10 procedures in at least 5 PTPs have to be major. The dose 
and frequency of BAX 855 administered will be guided by each subject’s PK profile 
using a single dose infusion of 60 ±5 IU/kg BAX 855 for major surgeries and BAX 855 
incremental recovery (IR) for minor surgeries.
A Phase 3 study to evaluate the efficacy and safety of BAX 855 in previously untreated 
patients (PUPs) < 6 years of age with severe hemophilia A (Study 261203) will be 
initiated once data are available from the pediatric study 261202 from 20 patients with 
50 EDs each, including a minimum of 10 patients <6 years, and when PK investigations 
in children <12 years are completed. In total, 110 subjects will be enrolled to have 
100 evaluable PUPs. There will be 2 prophylactic treatment arms of either 30 IU/kg or 
45 IU/kg BAX 855 administered twice weekly for ≥50 EDs.
A Phase 3 study will assess the safety and efficacy of PK-guided treatment with 
BAX 855 targeting two different FVIII trough levels (Study 261303). A total of 
120 subjects, 12 to 65 years old, with severe hemophilia A will be recruited, to have 
104 evaluable subjects (52 per treatment arm). 
In this continuation study (Study 261302), subjects will receive either a fixed dose 
prophylaxis with BAX 855 consisting of 45 ± 5 IU/kg for subjects aged ≥ 12 years or 
50 ± 10 IU/kg for subjects aged < 12 years twice weekly or, subjects can decide to 
receive a PK-tailored prophylactic BAX 855 dosing regimen based on the subject’s 
individual PK to maintain FVIII trough levels of ≥3%.
The fixed-dose prophylactic treatment regimens in this continuation study (45 ± 5 IU/kg 
twice weekly for subjects aged ≥ 12 years, to be increased to 80 IU/kg if needed, and 
50 ± 10 IU/kg twice weekly for subjects aged < 12 years, to be increased to 80 IU/kg if 
needed) are aligned with the dosing regimens used in the pivotal phase 3 study in subjects 
aged ≥ 12 years (Study 261201) and the pediatric PTP study in subjects aged < 12 years 
(Study 261202); with these dosing regimens the majority of subjects are assumed to 
maintain FVIII trough levels above 1% at all times. The increase to 80 IU/kg for subjects 

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aged ≥ 12 years as compared to the increase to 60 IU/kg in the pivotal study (Study 
261201) will provide more flexibility in the management of the subject.
Dose recommendations used in prophylaxis are usually designed to keep the FVIII trough 
level above 1% of the normal level7 because of the strong correlation between increasing 
time spent at FVIII level less than 1% and increase of the ABR.8 However, the 1% trough 
level is not applicable to prevent bleeding episodes in all patients. Especially patients 
with target joints or progressive hemophilic arthropathy often bleed in spite of 
maintenance of a 1 % trough level, although this association is difficult to assess in 
clinical practice.9
A pioneering bench mark study by Den Uijl et al. has suggested that the annual number 
of joint bleeds is asymptotically approaching zero when baseline levels of FVIII ≥ 10% 
are maintained.10 According to this model, the maximum reduction of annual joint bleeds 
will be achieved if FVIII trough levels are raised from 1 to 3%. This assumption is 
confirmed by another study in patients with moderate hemophilia (FVIII 1–5%) which 
demonstrated a median number of joint bleeds of 0 (IQR: 0–1.2) in patients with > 3% 
residual plasma FVIII activity.11
For above outlined reasons, a FVIII target trough level of ≥ 3 % has been selected for the 
PK-tailored prophylactic treatment regimen in this continuation study. The approach of a 
PK-tailored prophylactic dosing regimen takes the generally observed marked inter-
patient variability of PK parameters into account since the dose and frequency will be 
based on the patient’s individual PK. It is expected that by ensuring FVIII trough levels
of ≥3% the frequency of bleeding episodes may be substantially reduced.
The FVIII dosing for the treatment of bleeding episodes is aligned with recommendations 
in the EMA/CHMP/BPWP/1619/1999 rev.1.12 Also, recommended doses as high as 
60 ± 5 IU/kg for the treatment of bleeding episodes are based upon experience with these 
doses with ADVATE.
Overall exposure is based on the guideline EMA/CHMP/BPWP/144533/2009 for market 
authorization of FVIII products in which a minimum of 100 exposure days (EDs) in at 
least 200 subjects is recommended.6
6.2 Clinical Condition/Indication 
Hemophilia A is an X-chromosome linked recessive, congenital bleeding disorder caused 
by deficient or defective coagulation due to deficiency of FVIII. The absence of FVIII 
leads to 'spontaneous' bleeding episodes (occurring primarily in joints, muscles, and less 

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commonly, in soft tissues) and to excessive bleeding following trauma or injury. 
Hemophilia A is currently treated with FVIII replacement using either plasma-derived 
(pdFVIII) or rFVIII concentrates.13; 14
The intended indication for BAX 855 is the treatment and prevention of bleeding in 
subjects with hemophilia A.
6.3 Population To Be Studied
Approximately 250 PTPs with severe hemophilia A, of any ethnic group, aged ≤75 years, 
will be enrolled to achieve a total of 200 evaluable subjects. Each subject will have 
≥100 EDs with BAX 855, as accumulated across all BAX 855 studies in which the 
subject participates. 
Justification for enrollment of pediatric subjects is based on the nonclinical safety 
requirements outlined in the ICH M3 Guideline, Section 12 as well as the ICH E11 
Guideline on clinical investigation of medicinal products in the pediatric population. 
Hemophilia is a serious and potentially life-threatening disease. Pediatric subjects are 
expected to benefit from a full-length rFVIII molecule with an extended half-life. 
Moreover, results from nonclinical repeated toxicology studies, the core safety 
pharmacology package, and the clinical phase 1 study have not raised any safety or 
tolerability concerns. Furthermore, the parent protein molecule ADVATE has been used 
extensively in the entire pediatric population with no unforeseen adverse events (AEs) 
(refer to the ADVATE IB). BAX 855 naïve subjects <12 years of age will not be enrolled 
in this continuation study until enrollment in the BAX 855 pediatric PTP study in 
children aged <12 years (Study 261202) has been completed. In accordance with the 
EMA/CHMP/BPWP/144533/2009 guideline6, the study in pediatric PTPs < 12 years of 
age (Study 261202) will only be initiated once PK, hemostatic efficacy and safety data of 
20 PTPs aged ≥ 12 years treated with BAX855 for at least 50 EDs are available and 
evaluated by an independent DMC for its safety and efficacy. At least 60 evaluable 
subjects in this BAX 855 continuation study must be <12 years of age.
6.4 Findings from Nonclinical and Clinical Studies
6.4.1 Findings from Nonclinical Studies
BAX 855 is manufactured by covalently binding a branched PEG reagent with a 
molecular weight of 20 kDA to Baxter’s rFVIII (octocog alfa, ADVATE).
Baxter’s octocog alfa is expressed in CHO cells by a plasma/albumin free cell culture 
method and is the active substance in Baxter’s licensed product ADVATE. Thus, the 
viral safety of BAX 855 is ensured by the octocog alfa (ADVATE) bulk drug substance 

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manufacturing process as any potential risk of contamination with viruses or adventitious 
agents during the subsequent manufacturing steps of BAX 855 has been minimized. No 
substances of animal or human origin are added throughout the entire manufacturing 
process of BAX 855.
Preclinical studies have demonstrated BAX 855 to have comparable activity and other 
biochemical properties to ADVATE. The expected prolonged FVIII exposure by 
BAX 855 was demonstrated in PK studies with a mean residence time (MRT) longer than 
ADVATE in FVIII knock-out-mice (1.6 fold), rats (1.2 fold) and cynomolgus monkeys 
(1.5 fold). Prolonged efficacy was shown for BAX 855 in comparison to equivalent doses 
of ADVATE in 2 primary pharmacodynamic models in FVIII knock-out mice.
Additional data from nonclinical studies can be found in the BAX 855 IB.
6.4.2 Findings from Clinical Studies
A Phase 1, first in human study (Baxter Clinical Study 261101) to assess the safety and 
PK of BAX 855 in PTPs age 18 to 65 years with severe hemophilia A was conducted in 
Europe and Japan. The study investigated safety and PK of single doses of 30 and 
60 IU/kg BAX 855 compared to the same dose of ADVATE. Subjects were followed for 
28 days after BAX 855 administration for safety. Safety assessments included AEs, 
changes in vital signs, clinical laboratory assessments, and immunogenicity. 
A total of 24 subjects were enrolled; 19 were treated and 18 were evaluable for PK 
analysis. Nine were treated with 30 IU/kg (Cohort 1) and 10 were treated with 60 IU/kg 
(Cohort 2) of BAX 855, including 2 subjects from Japan. 
No subjects developed inhibitors to FVIII or binding antibodies to PEG after BAX 855 
infusion. Binding antibodies to FVIII and PEG-FVIII were present in some subjects after 
BAX 855 infusion but all were at the lowest detectable titers (ie, 1:20 or 1:40); these 
results could not be analyzed for specificity and were therefore interpreted as “low-titer 
indeterminate”. Furthermore, no increases in preexisting antibody titers were observed 
after BAX 855. There were no thrombosis-associated events or allergic reactions. No 
deaths or other serious adverse events (SAEs) occurred, and none of the 11 non-serious 
AEs (all mild or moderate) were considered treatment-related. Adverse events reported 
following BAX 855 administration included vomiting, nasopharyngitis, upper respiratory 
tract infection, influenza-like illness, arthralgia, headache, and localized swelling. No 
significant treatment-related changes in laboratory values or vital signs were recorded. 
There were no notable differences in the type or rate of AEs experienced by subjects after 
ADVATE infusion versus BAX 855 infusion.

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Eighteen subjects (Cohort 1, n=8; Cohort 2, n=10) were evaluable. Based on the 1 stage 
clotting assay, the median elimination phase half-life (T1/2; h) was longer for BAX 855 
than for ADVATE in both Cohort 1 (13.60 vs 9.90) and Cohort 2 (16.64 vs 11.11). Other 
PK parameters also supported an improved PK profile for BAX 855 compared to 
ADVATE. Refer to the ADVATE IB for more details on the clinical experience to date 
with ADVATE.
Based on these data, BAX 855 appears to be safe and well tolerated after a single dose 
administration. The mean T1/2 was 1.4 and 1.5-fold higher for BAX 855 compared to 
ADVATE in Cohorts 1 and 2, respectively, demonstrating prolonged circulation of BAX 
855 compared to ADVATE. These data support the use of the BAX 855 dosing regimens 
planned in this continuation study.
6.5 Evaluation of Anticipated Risks and Benefits of the Investigational Product(s) to 
Human Subjects
BAX 855 and ADVATE have undergone comparable preclinical single and repeated dose 
toxicology and pharmacology testing. The results suggest that BAX 855 has a 
comparable safety profile to ADVATE. Since the core protein of BAX 855 is identical to 
ADVATE, a safety profile similar to ADVATE is expected for BAX 855 when infused in 
humans. The most commonly reported adverse drug reactions described for ADVATE in 
post-marketing clinical studies include: FVIII inhibitors, pyrexia, and headache. Allergic-
type hypersensitivity reactions, including anaphylaxis, have been reported with 
ADVATE and have been manifested by dizziness, paresthesia, rash, flushing, face 
swelling, urticaria, and pruritus. Additional safety experience for ADVATE is provided 
in the ADVATE IB.
Since BAX 855 is a PEGylated form of ADVATE, it is possible that additional toxicity 
related to PEG may be observed. BAX 855 may react with preexisting anti-PEG 
antibodies, resulting in a clinical hypersensitivity reaction. There is also the potential risk 
of inducing anti-PEG or anti-BAX 855 antibodies following BAX 855 administration. 
The PEG component of BAX 855 may become dissociated from the FVIII molecule 
when it is incorporated into tissues. Preclinical studies with other PEGylated drugs have 
indicated that accumulation can lead to formation of macrophage foam cells, which 
function to actively remove the PEG molecules. In preclinical studies with other 
PEGylated drugs, the presence of these “foamy macrophages” has not been associated 
with any adverse effects.
Binding antibodies against PEG are present in the healthy population and in patients with 
hemophilia A. BAX 855 may react with pre-existing anti-PEG antibodies, potentially 

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resulting in a clinical hypersensitivity reaction or increased clearance of BAX 855 from 
circulation. BAX 855 and ADVATE showed a similar immunogenicity profile in 
preclinical in vitro and in vivo studies. Data from preclinical studies indicate that 
PEGylated human FVIII can only induce antibodies against PEG when FVIII is 
recognized as a foreign protein that can provide immunogenic epitopes for CD4+ T cells. 
PTPs with a high degree of previous exposure to FVIII should be immunotolerant to 
FVIII and are considered to have a low risk of developing antibodies against FVIII. 
Therefore, the risk for PTPs with severe hemophilia A who do not have neutralizing 
antibodies against FVIII (inhibitors) of developing antibodies against PEG is considered 
to be rather low when treated with BAX 855. Moreover, results from a tissue cross 
reactivity study show that even high-affinity antibodies against PEG do not cross-react 
with any human tissue.
BAX 855 has been administered as a single dose of 30 IU/kg to 9 subjects and a single 
dose of 60 IU/kg to 10 subjects with severe hemophilia A in a Phase 1 study (Baxter 
clinical study 261101). Based on data from this study (see Section 6.4.2), there currently 
are no anticipated risks of BAX 855, beyond those associated with ADVATE, when 
administered in human subjects. 
The comparability of BAX 855 to ADVATE, the preclinical safety profile of BAX 855, 
and the data from the Phase 1 study, suggest an acceptable risk benefit profile for BAX 
855. Additional details related to risks and benefits can be found in the BAX 855 IB.
6.6 Compliance Statement
This study will be conducted in accordance with this protocol, the International 
Conference on Harmonisation Guideline for Good Clinical Practice E6 (ICH GCP, 
April 1996), Title 21 of the US Code of Federal Regulations (US CFR), the European 
Clinical Trial Directive (2001/20/EC and 2005/28/EC), and applicable national and local 
regulatory requirements.
7. STUDY PURPOSE AND OBJECTIVES
7.1 Study Purpose
The purpose of the study is to continue the evaluation of the safety and efficacy of 
BAX 855 for prophylaxis and treatment of bleeding episodes in adult and pediatric PTPs 
aged ≤75 years with severe hemophilia A.

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7.2 Primary Objectives
The co-primary objectives of the study are:
1.
To determine the safety of BAX 855 based on the incidence of FVIII inhibitory 
antibody development 
2.
To determine the efficacy of BAX 855 based on the annualized bleed rate 
(ABR) of spontaneous bleeding episodes
7.3 Secondary Objectives
7.3.1 Efficacy
1.
To determine the total ABR (spontaneous and traumatic bleeding episodes)
2.
To determine the overall hemostatic efficacy rating of BAX 855 for treatment of 
breakthrough bleeding episodes
3.
To determine the length of intervals between bleeding episodes
4.
To characterize the hemostatic efficacy of BAX 855 for treatment of bleeding 
episodes by the number of BAX 855 infusions for treatment
5.
To determine total weight-adjusted consumption of BAX 855 for prophylaxis 
and for treatment of bleeding episodes
6.
To assess Patient Reported Outcomes (PROs) over time for subjects receiving 
BAX 855
7.3.2 Safety
1. To determine the safety of BAX 855, as assessed by the occurrence of AEs and 
changes in vital signs and clinical laboratory parameters 
2. To determine the immunogenicity of BAX 855
7.4 Exploratory Objectives
1. To assess patient satisfaction, patient activity levels, and health resource use over 
time for subjects receiving BAX 855
2. To determine the potential correlation between TGA parameters, FVIII trough 
levels and ABR
8. STUDY DESIGN
8.1 Brief Summary
This is a phase 3b, prospective, open label, multi-center study to evaluate the safety and 
efficacy of BAX 855 for prophylactic use and the control of bleeding episodes in 
approximately 200 pediatric and adult PTPs ≤75 years of age with severe hemophilia A. 

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The study plans to include subjects from other BAX 855 studies and BAX 855-naïve 
subjects. 
Subjects will receive either a fixed dose prophylaxis with BAX 855 consisting of 45 ± 
5 IU/kg for subjects aged ≥ 12 years or 50 ± 10 IU/kg for subjects aged < 12 years twice 
weekly or, subjects can decide to receive a PK-tailored prophylactic BAX 855 dosing 
regimen based on the subject’s individual PK to maintain FVIII trough levels of ≥3%. 
Subjects will be treated on the specified prophylactic treatment regimen until they reach 
at least 100 EDs (as accumulated across all BAX 855 studies). The overall study design is 
illustrated in Figure 1.
8.2 Overall Study Design 
Subjects who complete treatment and assessments in the other BAX 855 studies and 
BAX 855-naïve subjects who fulfill the inclusion/exclusion criteria will be eligible to 
participate in this continuation study. Approximately 250 PTPs with severe hemophilia A 
will be enrolled to achieve 200 evaluable subjects. This study was designed to be in 
compliance with EMA/CHMP/BPWP/144533/20096 recommendations for the study of 
FVIII in severe hemophilia A.
The subject’s hemophilia history, bleeding episode history, and FVIII usage and 
treatment regimen(s) within the previous year will be collected at screening for BAX 855 
naïve subjects. Results of the screening assessments will be used to establish subject’s 
eligibility for this study and may serve as baseline measurements. Subjects transitioning 
from the other BAX 855 studies may use end of study assessments in their prior study for 
screening assessments in this continuation study.
Once eligibility is established, subjects can choose to receive either a fixed BAX 855 
prophylaxis or a PK-tailored BAX 855 prophylaxis (as described in Section 8.7.3). 
Subjects will also treat breakthrough bleeding episodes with BAX 855. Details on 
bleeding episodes, the number of infusions used for treatment, and the efficacy of 
treatment (based on a 4-point rating scale; see Section 11.2) will be recorded in an 
electronic diary (e-diary). Subjects will be treated with BAX 855 for a minimum of 
100 EDs (accumulated across all BAX 855 studies they have participated in).
Transitioning subjects receiving a fixed dose prophylactic treatment regimen will return 
to the study site at 6 weeks following screening to confirm eligibility and at this visit and 
subsequent visits every 3 months following screening, IR will be determined, efficacy 
and safety will be assessed and e-diary will be reviewed. BAX855 naïve subjects with 

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confirmed eligibility will undergo their baseline visit for determination of IR at exposure 
day 1 (ED1) and return to the study site after 6 weeks and every 3 months following their 
baseline visit for IR determination, efficacy and safety assessment and e-diary review.
Subjects receiving a PK-tailored prophylactic treatment regimen will have their PK 
assessment performed following eligibility confirmation. Following PK assessment, they
undergo their baseline visit and subsequent visits every 3 months following their baseline 
visit for IR determination, efficacy and safety assessment and e-diary review. In addition, 
at 4 ,8 and 18 weeks after the baseline visit, subjects’ FVIII levels, TGA parameters and 
VWF antigen will be measured to ensure that FVIII trough levels of ≥3% are maintained, 
and, if necessary, dose adjustments will have to be performed. Also, hemostatic efficacy 
and clinical safety will be assessed and e-diary reviewed.
Investigators will review e-diaries for untoward events, concomitant medications, non-
drug therapies, and patient reported outcomes (PROs; see Section 10.5.2). Safety 
assessments performed at the study visit will include immunogenicity (inhibitory 
antibodies for FVIII and binding antibodies for FVIII, BAX 855, PEG, and CHO), and
changes in conditions of the physical examination, vital signs, and clinical laboratory 
assessments (hematology, clinical chemistry, and lipids). Subjects who develop a high 
responder inhibitor (> 5 Bethesda Units [BU]), or who develop a low responder inhibitor 
(≤ 5 BU but ≥ 0.6 BU) that cannot be adequately managed by the prescribed prophylaxis 
regimen with BAX 855 will be discontinued from study. At every study visitiii, IR for 
FVIII activity and TGA parameters (optional in subjects receiving fixed dose 
prophylaxis) will be determined within 30 minutes prior to infusion with 60 ± 5 IU/kg 
BAX 855 and 30 ± 15 minutes following the infusion. Also, TGA parameters and pre-
infusion VWF antigen level will be assessed in subjects receiving a PK-tailored dosing 
(optional for subjects aged < 12 years).
The sponsor will suspend enrollment and treatment if 2 or more subjects develop 
anaphylaxis after BAX 855 treatment. The sponsor may stop this study at any time. In 
addition, the sponsor may modify the study based on results of the other BAX 855 
studies.
8.3 Duration of Study Period(s) and Subject Participation
The overall duration of this continuation study is estimated to be approximately 4 years
from study initiation (ie, first subject enrolled by signing informed consent) to study 
                                                
iii
Except at visits 4 ± 1, 8 ± 1 and 18 ± 2 weeks following baseline in those subjects receiving PK-tailored 
treatment regimen.

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completion (ie, last subject last visit). Recruitment of transitioning subjects will continue 
until the last subject has completed any other BAX 855 study.
Each subject will participate in the study until a total of at least 100 EDs to BAX 855 has 
been achieved (accumulated across all BAX 855 studies in which each subject 
participated). Depending on the subject’s BAX 855 exposure history and treatment 
regimen given, the planned duration of subject participation to reach the 100 EDs (from 
enrollment to subject completion) can vary from approximately 3 to 12 months. 
However, extension of the study duration for individual subjects beyond the 100 EDs 
may be granted.
8.4 Outcome Measures
8.4.1 Primary Outcome Measures
8.4.1.1 Safety
Development of inhibitory antibodies to FVIII 
8.4.1.2 Efficacy
Spontaneous ABR
8.4.2 Secondary Outcome Measures
8.4.2.1 Efficacy
1. Total ABR (spontaneous and traumatic bleeding episodes)
2. Overall hemostatic efficacy rating of BAX 855 for treatment of breakthrough 
bleeding episodes
3. Number of BAX 855 infusions to treat bleeding episodes
4. Time intervals between bleeding episodes
5. Weight-adjusted consumption of BAX 855
8.4.2.2 Safety
1. Occurrence of AEs and SAEs
2. Changes in vital signs and clinical laboratory parameters (hematology, clinical 
chemistry, and lipids)
3. Immunogenicity
a.
Binding antibodies (IgG and IgM) to FVIII, BAX 855, and PEG
b. Anti-CHO antibodies

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8.4.2.3 Patient Reported Outcomes
Changes from baseline in parent study, if applicable, in the following:
1. Bleed and pain severity as measured using the Haemo-SYM questionnaire
2. HRQoL as assessed using the SF-36/PedsQL questionnaires
8.4.3 Exploratory Outcomes Measure
1. Patient satisfaction with treatment will be assessed using the Satisfaction Question 
Set
2. Patient Activity Level
3. Health resource use data (eg, physician office visits, hospitalizations, days missed 
from work/school)
4. TGA parameters, FVIII trough levels and ABR
8.5 Randomization and Blinding
This is a non-randomized, open-label, active treatment clinical study. 
8.6 Study Stopping Rules
This study will be stopped if 1 or more of the following criteria are met:
Enrollment and treatment in this continuation study will be suspended or stopped, if the 
following criterion is met:
1.If 2 or more subjects develop anaphylaxis following exposure to BAX 855
The study may be terminated, if one or more of the following criteria are met:
1. The sponsor decides to terminate the study based upon its own assessment of 
safety
2. The sponsor decides to terminate the study for administrative reasons
8.7 Investigational Product(s)
8.7.1 Packaging, Labeling, and Storage
BAX 855 is formulated as a sterile, highly purified protein preparation in lyophilized 
form for i.v. infusion and is provided in single-dose vials along with a vial of diluent 
(2 or 5 mL SWFI, as available). A butterfly transfer set with luer-lock syringes and a 
needleless transfer device will be used for reconstitution and bolus i.v. delivery 
(BAXJECT II high-flow [HF] and BAXJECT III, as available). The BAXJECT system is 
a needleless liquid transfer device with the primary function of transferring diluent from 

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its vial into an evacuated vial containing product requiring reconstitution prior to 
infusion. 
A minimum of 4 lots of BAX 855 manufactured for this study will be used. Four nominal 
potencies of BAX 855 will be used, depending upon availability: 250, 500, 1,000 and 
2,000 IU/vial. 
The recommended storage conditions for BAX 855 are 2°C to 8°C (36°F to 46°F) and it 
should not be allowed to freeze. BAX 855 should be stored and protected from light. The 
reconstituted product should ideally be used immediately but no longer than 3 hours after 
reconstitution.
For additional information, such as reconstitution instructions, refer to the BAX 855 IB 
and/or other specific instructions provided by the sponsor.
8.7.2 Administration
Following reconstitution, BAX 855 should be administered using plastic syringes 
provided by the sponsor since proteins such as BAX 855 may adhere to the surface of 
glass syringes. BAX 855 will be administered i.v., using an appropriately sized syringe, 
as a bolus infusion over a period of ≤5 minutes with a maximum infusion rate of 
10 mL/min, as described in the BAX 855 IB. The reconstituted BAX 855 must be 
administered at room temperature and within 3 hours.
BAX 855 dose calculation will be based on the stated actual potency on vials in 
respective lots.
PK assessment and determination of IR
For the PK assessment in individual subjects, only vials of the same lot with a nominal 
potency of 500 IU should preferably be used. Alternatively, 1000 IU vials of the same lot 
could be used.

In subjects aged ≥ 12 years: total calculated dose may be rounded up to the 
nearest whole vial in case 500 IU potency vials are used. However, in case vials 
with a nominal potency of 1,000 IU/vial are used, the total calculated dose should 
not be rounded up to the nearest whole vial to ensure accurate dosing (eg, 2.5 
vials).

In subjects aged < 12 years: The exact amount of IUs has to be administered 
irrespective of the potency used (eg, 1.5 vials).

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Infusions for prophylaxis and treatment of bleeding episodes
Two different lots per infusion may be used, however, each vial must be reconstituted 
with its own kit. The total calculated dose can be rounded up to the nearest whole vial.
8.7.3 Description of Treatment
Subjects will be treated on either a fixed dose or PK-tailored prophylactic treatment 
regimeniv until they reach at least 100 EDs (accumulated across all studies). Subjects who 
received on-demand treatment in the pivotal study (Study 261201) and decide to receive 
a PK-tailored treatment regimen in this study will first receive a fixed dose prophylactic 
treatment regimen (as outlined in Section 8.7.3.1) until their dose and frequency is 
determined and the first PK-tailored dose administered. 
8.7.3.1 Fixed Dose Prophylactic Treatment Regimen
The fixed dose prophylactic treatment regimen with BAX 855 will be age-dependent as 
follows:

Subjects aged ≥ 12 years:
45 ± 5 IU/kg twice weekly, which may be increased 
up to 80 IU/kg

Subjects aged < 12 years:
50 ± 10 IU/kg twice weekly, which may be increased 
up to 80 IU/kg
Subjects must adhere as closely as possible to the dosing regimen. The days of the week
on which treatment is administered may be selected by the subject and/or his/her
physician and should be selected to provide maximum coverage for vigorous activities.
Dosing must be administered twice weekly, at 3 and 4 day intervals (Option X), or 3.5 
day intervals (Option Y with AM and PM dosing) and should be maintained during the 
study (Table 2). If a dose is missed, it must be documented and the next dose will be 
taken as soon as possible. After this dose, the regularly scheduled regimen will be 
resumed. For example, in Option X, if twice weekly dosing is scheduled for every 
Monday and Thursday and the subject misses the Thursday dose, he/she should infuse the 
next dose on Friday and then resume his/her schedule with subsequent dose on Monday). 
And for Option Y, if dosing is scheduled for the morning on Monday and the evening 
dose on Thursday, and the subject misses the Thursday dose, he/she should infuse the 
                                                
iv Please note that subjects who are on a 30-80 IU/kg every 5 days (q5d) or every 7 days (q7d) treatment 
regimen prior to this protocol amendment 4 (dated 23 May 2014) being effective can decide to continue 
on their 30-80 IU/kg q5d or q7d treatment regimen after this protocol amendment 4 (dated 23 May 
2014) is effective. These subjects will then follow the procedures as described for transitioning subjects 
on a fixed dose prophylactic treatment regimen (see also Supplement 20.3.1). Additionally, these 
subjects can decide to switch to a fixed dose or PK-tailored prophylactic treatment regimen as per
protocol amendment 4 (dated 23 May 2014) at any time during the study.

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next dose on Friday morning, and then resume his/her schedule with a subsequent dose 
on Monday morning.
Table 2
BAX 855 Example Dosing Frequency
Day
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Morning
X or Y
X
Evening
Y
Subjects requiring treatment for a breakthrough bleeding episode should resume 
prophylaxis as soon as the bleeding episode is resolved. They should return to the same 
schedule of dosing as if prophylactic dosing was not interrupted. For example, if the 
subject is typically dosed every Monday and Thursday and is treated for a bleeding 
episode on Wednesday and the bleeding episode is resolved on Thursday, he/she would 
resume prophylaxis on Thursday; if the bleeding episode is not resolved until Friday, 
his/her next prophylactic dose would be on Monday (ie, subjects will resume their 
prophylactic treatment regimen the next scheduled day after the last therapeutic infusion 
for the treatment of a bleeding episode).
In order to ensure the required washout periods of at least 84 to preferably 96 hours prior 
to study visits, the scheduled regimen may be interrupted for this period but should be 
resumed once the study visit is completed.
8.7.3.2 BAX 855 Dose and/or Frequency Adjustments for Subjects on Fixed Dose 
Prophylactic Treatment Regimen
Subjects meeting any of the following criteria during their fixed dose prophylaxis may 
have their BAX 855 dosage and/or infusion frequency increased:

Two or more spontaneous (not trauma-related) bleeding episodes in the same 
target joint within any 2-month period 

One or more spontaneous (not trauma-related) bleeding episodes in a non-target 
joint within any 2-month period

FVIII trough level < 1% and investigator’s estimate that the subject has an 
increased risk of bleeding 
The BAX 855 dosage may be increased gradually up to a maximum of 80 ± 5 IU/kg 
and/or an increase in frequency may be considered if deemed necessary, in case the 

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subject continues to experience spontaneous breakthrough bleeding episodes. In any case, 
the sponsor should be notified if any of the above criteria are met and dose adjustment is 
performed.
Additionally, for subjects with severe hemophilic arthropathy and/or target joints who 
continue to experience recurrent bleeding episodes despite adjustments to the 
prophylactic dose and/or dosing frequency, an ultrasound of the affected joint(s) should 
be performed to verify the presence of a bleed.
8.7.3.3 PK-Tailored Prophylactic Treatment Regimen
Subjects may decide to receive a PK-tailored prophylactic treatment regimen to maintain 
a FVIII trough level of ≥3%. The dose should not exceed 80 IU/kg and the FVIII peak
levels should not exceed 200%.
Subjects choosing a PK-tailored prophylactic treatment who did not undergo a PK 
assessment in a previous BAX 855 study will undergo an abbreviated PK assessment 
with 1 pre- and 6 post-infusion sampling times up to 96 ± 4 hours (for subjects aged 
≥12 years) or 1 pre- and 3 post-infusion sampling times up to 56 ± 4 hours (for subjects 
aged < 12 years) following the infusion of 60 ± 5 IU/kg of BAX 855.
Based on the subject’s individual PK, the dose will be calculated to ensure FVIII target 
trough levels in plasma of ≥3%. The dose will be calculated by the sponsor and provided 
to the study site. The frequency of dosing will be at least twice weekly or more, 
depending on subject’s T1/2 and preference for treatment schedule.
Subjects must adhere as closely as possible to the dosing regimen. If a dose is missed, it 
must be documented and the next dose will be taken as soon as possible. After this dose, 
the regularly scheduled regimen will be resumed. Subjects requiring treatment for a 
breakthrough bleeding episode should resume their PK-tailored prophylaxis as soon as 
the bleeding episode is resolved. 
In order to ensure the required washout periods of at least 84 to preferably 96 hours prior 
to study visitsv, the scheduled regimen may be interrupted for this period but should be 
resumed once the study visit is completed. For the determination of FVIII trough levels at 
visit 4 ± 1, 8 ± 1 and 18 ± 2 weeks following baseline, no wash-out period is required. 
The visits should be planned so that a blood sample can be drawn immediately prior to a 
regularly planned prophylactic infusion.
                                                
v
For subjects on a more than twice weekly dosing regimen, every attempt should be made to adhere to 
the minimum washout period of 84 hours.

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8.7.3.4 BAX 855 Dose and/or Frequency Adjustments for Subjects on PK-Tailored 
Prophylactic Treatment Regimen
Subjects meeting any of the following criteria during their PK-tailored prophylaxis may 
have their BAX 855 dosage and/or infusion frequency increased:

Two or more spontaneous (not trauma-related) bleeding episodes in the same 
target joint within any 2-month period 

One or more spontaneous (not trauma-related) bleeding episodes in a non-target 
joint within any 2-month period

FVIII trough level < 3%
The BAX 855 dosage may be increased gradually up to a maximum of 80 ± 5 IU/kg 
and/or the dosing frequency may be increased, in case the subject continues to experience 
spontaneous breakthrough bleeding episodes. In any case, the sponsor should be notified 
if any of the above criteria are met and dose/frequency adjustment is performed; 
dose/frequency adjustment options can be discussed with the sponsor’s medical director.
Additionally, subjects with severe hemophilic arthropathy and/or target joints who 
continue to experience recurrent bleeding episodes despite adjustments to the 
prophylactic dose and/or dosing frequency, an ultrasound of the affected joint(s) should 
be performed to verify the presence of a bleed.
8.7.3.5 Treatment of Bleeding Episodes
BAX 855 will be used for the treatment of bleeding episodes (ie, breakthrough bleeding 
episodes during prophylaxis), according to the guidelines outlined in Table 3. These 
guidelines may be adjusted (ie, below 10 [± 5] IU/kg or above 60 [± 5] IU/kg) by the 
investigator based upon his or her clinical judgment and the severity of the bleeding 
episode (see Table 3). 
It is critical that treatment of a bleed is initiated as soon as possible after occurrence 
of the bleeding episode.
When bleeding is controlled, additional infusions of BAX 855 to maintain hemostasis is 
permitted, if required. The infusion for maintenance of hemostasis should be 
administered within 24 hours of the most recent infusion. Otherwise it is considered a 
prophylactic infusion.

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Table 3
BAX 855 Treatment Guidelines for Bleeding Episodes
Type of Bleeding Episode
FVIII Level 
Required (%)
Dose
(IU/kg)
Frequency of Dosing
Minor
Early hemarthrosis, mild 
muscle bleeding, or mild oral 
bleeding, including, epistaxis
20 to 40%
Dose
10 to 20 (±5) 
IU/kg
Repeat infusions every 12 to 24 h.
Duration: at least 1 day, until the 
bleeding episode is resolved or 
healing is achieved
Moderate
Moderate bleeding into 
muscles, bleeding into the oral 
cavity, definite/more extensive
hemarthroses, and known 
trauma
30 to 60%
Dose
15 to 30 (±5) 
IU/kg
Repeat infusions every 12 to 24 h 
for 3 days or more until the pain and 
acute disability/incapacity are 
resolved
Major 
Significant gastrointestinal 
bleeding, intracranial, intra-
abdominal, or intrathoracic 
bleeding, central nervous 
system bleeding, bleeding in 
the retropharyngeal or 
retroperitoneal spaces or 
iliopsoas sheath, fractures, 
head trauma
60 to 100%
Dose
30 to 60 (±5) 
IU/kg
In case of life-
threatening 
bleeds, a dose of 
80 (±5) IU/kg 
may be 
considered
Repeat infusions every 8 to 12 h 
until the bleeding episode/threat is 
resolved
The required units will be calculated according to the following formula:
body weight (kg) x desired FVIII rise (%) (IU/dL) x {reciprocal of observed 
recovery}
Whenever possible, the subject’s most recent individual IR should be used. In its absence,
an anticipated recovery of 2.5 (IU/dL)/(IU/kg) based on data of the Phase 1 study, Cohort 
2, should be assumed and the required units calculated using the following formula:
body weight (kg) x desired FIX rise (%or (IU/dL) x 0.4 dL/kg

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The amount to be administered and the frequency of administration should always be
oriented to the clinical effectiveness in the individual case. In subjects with severe 
hemophilic arthropathy and/or target joints with recurrent bleeding requiring more than 
2 infusions per bleeding and/or where efficacy ratings are generally fair or none, an 
ultrasound of the affected joint(s) may be considered to verify the presence of a bleed.
8.7.3.6 Immune Tolerance Induction for Inhibitor Development
Subjects who develop a confirmed (ie, 2 separate assessments within a 2 to 4 week period 
from the central laboratory) high responder inhibitor (>5 BU) or low responder inhibitor 
(≤5 BU but ≥0.6 BU) that cannot be adequately managed by the protocol-required 
prophylactic regimen with BAX 855 will be discontinued from this continuation study. 
The decision to initiate immune tolerance induction (ITI) (ITI) with ADVATE will be 
made by the subject’s physician, and may be discussed with the sponsor’s medical 
director prior to initiation. The regimen used for ITI will be determined by the treating 
physician but must be approved by the sponsor’s medical director. ITI is not within the 
scope of this study.
8.7.4 Treatment for Surgery or Dental Procedures 
Subjects enrolled in this continuation study who require elective major or minor surgical 
or dental procedures or minor emergency surgical or dental procedures may be eligible to 
enroll in the BAX 855 surgery study (Study 261204), which is evaluating efficacy and 
safety of BAX 855 for perioperative management, if the study is open for enrollment. 
Exemptions may be granted for minor interventions in case the surgery study is not in 
place at the study site and the intervention can be managed by one prophylactic infusion 
and an additional infusion to maintain hemostasis. However, to ensure an adequate dose, 
at least an individual IR must be available which can also be based on FVIII activity 
levels determined at the local laboratory with back-up samples drawn for determination at 
the central laboratory. Any required major emergency surgery will result in withdrawal of 
the subject.
Upon completion of the surgery study, subjects may be eligible to return to this 
continuation study when they are able to resume their continuation study-specific
prophylaxis regimen and with the approval of the sponsor’s medical director. Upon return 
to this study, these subjects will receive their previous continuation study treatment 
regimen. 

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Subjects from this continuation study who participate in the surgery study will continue 
to receive their study-specific BAX 855 treatment from the continuation study as follows: 

For subjects undergoing PK (required for major surgery) or IR (required for minor 
surgery) assessment in the surgery study:
1. From signing the informed consent until the pre-surgical PKvi/IRvii assessment
required for major surgery.
2. From completion of the pre-surgical PK/IR assessment until the loading dose 
prior to surgery.

For subjects not undergoing PK/IR assessment in the surgery study:
1. From signing the informed consent until the loading dose prior to surgery.
During the period from screening up to the loading dose prior to the surgery in which 
subjects receive BAX 855 from the continuation study, subjects will maintain their e-
diaries for the continuation study, and the investigator of the continuation study will be 
responsible for the subject’s safety and treatment. Any data collected during the above-
listed periods will be recorded as part of this continuation study.
During the pre-surgery PK assessment and during the period starting with the initial 
loading dose until the end of the surgery study, subjects will receive BAX 855 from the 
surgery study. Any data collected during these periods will be recorded as part of the 
surgery study. 
EDs will be counted in the subjects’ primary study, ie BAX 855 EDs accumulated as part 
of the surgery study will also be factored into the total number of EDs in the continuation 
study.
For subjects transitioning back from the surgery study to this study, the investigator will 
determine whether the subject continues to meet the eligibility criteria using end of study 
data from the surgery study. 
8.7.5 . Investigational Product Accountability
The investigator will ensure that the IP is stored as specified in the protocol and that the 
storage area is secured, with access limited to authorized study personnel. The 
investigator will maintain records that the IP was received, including the date received, 
drug identity code, date of manufacture or expiration date, amount received and 
                                                
vi Subjects undergoing major surgeries who have undergone a PK determination in the current study do 
not require a pre-surgical PK assessment.
vii Subjects undergoing minor surgeries but do not have an IR performed within 3 months of surgery have 
to perform an IR.

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disposition. IP must be dispensed only at the study site or other suitable location (eg,
infusion center, home, as applicable per study design). Records will be maintained that 
includes the subject identification code (SIC), dispensation date, and amount dispensed. 
All remaining partially used and/or unused IP will be returned to the study site, which 
will then return it to the sponsor or sponsor’s representative after study 
completion/termination, or destroyed with the permission of the sponsor in accordance 
with applicable laws and study site procedures. If IP is to be destroyed, the investigator 
will provide documentation in accordance with sponsor’s specifications.
For further detail, please refer to the pharmacy and IP distribution manual for this study.
8.8 Source Data
Per ICH GCP, source data are defined as all information in original records and certified 
copies of original records of clinical findings, observations, or other activities in a clinical 
trial that are necessary for the reconstruction and evaluation of the trial. Source data are 
contained in source documents (original records or certified copies), which may be in 
paper and/or electronic format. Source data for this study comprise the following: 
hospital records, medical records, clinical and office charts, laboratory notes, 
memoranda, subjects' diaries or evaluation checklists, outcomes reported by subjects, 
pharmacy dispensing records, recorded data from automated instruments, copies or 
transcriptions certified after verification as being accurate copies, microfiches, 
photographic negatives, microfilm or magnetic media, x-rays, subject files, and records 
kept at the pharmacy, at the laboratories and at medico-technical departments involved in 
the clinical study.
For additional information on study documentation and electronic case report forms 
(eCRFs), see Section 17.2. The use of subject diaries is described in Section 10.5.
9. SUBJECT SELECTION, WITHDRAWAL, AND DISCONTINUATION
9.1 Inclusion Criteria
9.1.1 Subjects Transitioning from Other BAX 855 Studies
Subjects transitioning from other BAX 855 studies can be provided with the continuation 
study informed consent form (ICF) prior to the end of study visit to review and consider 
participation in this continuation study. These subjects will complete any additional 
screening assessments within 2 weeks of the previous study’s end of study visit and will 
return to the study site within 6 (± 1) weeks of the previous study end of study visit to 
confirm eligibility for this continuation study.

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Subjects transitioning from other BAX 855 studies who meet ALL of the following 
criteria are eligible for this study:
1.
Subject has completed a previous BAX 855 study and is willing to immediately 
transition into this continuation study.viii
2.
Subject is ≤75 years of age at screening of the previous BAX 855 study. 
3.
Subject continues to have a Karnofsky (for subjects aged ≥ 16 years) or Lansky 
(for subjects aged < 16 years) performance score of ≥ 60 (see Section 20.5).
4.
Subject is human immunodeficiency virus negative (HIV-); or HIV+ with stable 
disease and CD4+ count ≥ 200 cells/mm3, as confirmed by central laboratory at 
screening. 
5.
Subject is hepatitis C virus negative (HCV-) by antibody or PCR testing (if 
positive, antibody titer will be confirmed by PCR), as confirmed by central 
laboratory at screening; or HCV+ with chronic stable hepatitis.
6.
If female of childbearing potential, subject presents with a negative urine
pregnancy test and agrees to employ adequate birth control measures for the 
duration of the study.
7.
Subject and/or legally authorized representative is willing and able to comply 
with the requirements of the protocol.
9.1.2 BAX 855 Naïve Subjects
BAX 855 naïve subjects who are ≥12 years of age can only be enrolled in this 
continuation study after enrollment in the phase 2/3 pivotal study is closed. BAX 855 
naïve subjects who are < 12 years of age can only be enrolled in this continuation study 
after enrollment in the pediatric PTP study is closed.
Enrolment of BAX 855 naïve subjects will only start once the sponsor has notified 
the study sites accordingly.
BAX 855 naïve subjects who meet ALL of the following criteria are eligible for this 
study:
1.
Subject is ≤75 years of age at screening.
2.
Subject is naïve to BAX 855.
                                                
viiiNOTE: Subjects who have received FVIII concentrates other than BAX 855 following completion of 
the previous BAX 855 study are excluded from participation in this continuation study.

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3.
Subject has severe hemophilia A (FVIII clotting activity < 1%) as confirmed by 
central laboratory at screening after at least a 72-hour washout periodix. 
4.
Subject aged ≥ 6 years has documented previous treatment with plasma-derived 
FVIII or rFVIII for ≥ 150 EDs. 
5.
Subject aged < 6 years has documented previous treatment with plasma-derived 
FVIII concentrates or rFVIII for ≥ 50 EDs.
6.
Subject is currently receiving prophylaxis or on-demand therapy with FVIII.
7.
Subject has a Karnofsky (for subjects aged ≥ 16 years) or Lansky (for subjects 
aged < 16 years) performance score of ≥ 60 (see Section 20.5).
8.
Subject is HIV-; or HIV+ with stable disease and CD4+ count ≥ 200 cells/mm3, 
as confirmed by central laboratory at screening. 
9.
Subject is HCV- by antibody or PCR testing (if positive, antibody titer will be 
confirmed by PCR), as confirmed by central laboratory at screening; or HCV+ 
with chronic stable hepatitis.
10. If female of childbearing potential, subject presents with a negative urine
pregnancy test and agrees to employ adequate birth control measures for the 
duration of the study.
11. Subject and/or legally authorized representative is willing and able to comply 
with the requirements of the protocol.
9.2 Exclusion Criteria
9.2.1 Subjects Transitioning from Other BAX 855 Studies
Subjects transitioning from other BAX 855 studies who meet ANY of the following 
criteria are not eligible for this study:
1.
Subject had detectable FVIII inhibitory antibodies (≥ 0.6 BU using the Nijmegen 
modification of the Bethesda assay) as confirmed by central laboratory at 
screening.
2.
Subject has developed FVIII inhibitory antibodies (≥ 0.6 BU using the Nijmegen 
modification of the Bethesda assay as determined at central laboratory in a 
previous BAX 855 study).
3.
Subject has acquired a hemostatic defect other than hemophilia A (eg, 
qualitative platelet defect or von Willebrand’s disease) in a previous BAX 855 
study.
                                                
ix If FVIII activity is ≥1%, severe hemophilia A classification can be confirmed by historically 
documented FVIII clotting activity < 1% performed by a certified clinical laboratory or by a 
documented genotype known to result in severe hemophilia A.

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4.
Subject has severe chronic hepatic dysfunction (eg, ≥ 5 times upper limit of 
normal alanine aminotransferase [ALT], as confirmed by central laboratory at 
screening).
5.
Subject has severe renal impairment (serum creatinine > 2.0 mg/dL), as 
confirmed by central laboratory at screening.
6. Subject experienced a life-threatening or gastrointestinal bleeding episode within 
3 months prior to study entry.
7.
Subject is scheduled to use other PEGylated drugs during study participation.
8.
Subject is planning to take part in any other clinical study during the course of 
the continuation study, with the exception of any other parallel BAX 855 study.
9.
Subject has medical, psychiatric, or cognitive illness or recreational drug/alcohol 
use that, in the opinion of the investigator, would affect subject safety or 
compliance.
10. Subject is a family member or employee of the investigator.
9.2.2 BAX 855 Naïve Subjects
BAX 855 naïve subjects who meet ANY of the following criteria are not eligible for this 
study:
1.
Subject has detectable FVIII inhibitory antibodies (≥ 0.6 BU using the Nijmegen 
modification of the Bethesda assay) as confirmed by central laboratory at 
screening.
2.
Subject has history of FVIII inhibitory antibodies (≥ 0.6 BU using the Nijmegen 
modification of the Bethesda assay or the Bethesda assay) at any time prior to 
screening.
3.
Subject has been diagnosed with an inherited or acquired hemostatic defect other 
than hemophilia A (eg, qualitative platelet defect or von Willebrand’s disease).
4.
Subject has known hypersensitivity towards mouse or hamster proteins, PEG, or 
Tween 80.
5.
Subject has severe chronic hepatic dysfunction eg, ≥ 5 times upper limit of 
normal ALT, as confirmed by central laboratory at screening).
6.
Subject has severe renal impairment (serum creatinine > 2.0 mg/dL), as 
confirmed by central laboratory at screening.
7.
Subject experienced a life-threatening or gastrointestinal bleeding episode within 
3 months prior to study entry.
8.
Subject has current or recent (< 30 days) use of other PEGylated drugs prior to 
study participation or scheduled use of such drugs during study participation. 

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9.
Subject has participated in another clinical study involving an IP other than 
BAX 855 or device within 30 days prior to enrollment or is scheduled to 
participate in another clinical study involving an IP or investigational device 
during the course of this study.
10. Subject has medical, psychiatric, or cognitive illness or recreational drug/alcohol 
use that, in the opinion of the investigator, would affect subject safety or 
compliance.
11. Subject is a family member or employee of the investigator.
9.3 Withdrawal and Discontinuation
Any subject may voluntarily withdraw (ie, reduce the degree of participation in the study) 
consent for continued participation and data collection. The reason for withdrawal will be 
recorded on the End of Study eCRF. Assessments to be performed at the end of study 
visit (including in cases of withdrawal or discontinuation) are described in Section 10.6
and Section 20.3.
Discontinuation (ie, complete withdrawal from study participation) may be due to 
dropout (ie, active discontinuation by subject) or loss to follow-up (ie, discontinuation by 
subject without notice or action). Additionally, the investigator and sponsor have the 
discretion to discontinue any subject from the study if, in their judgment, continued 
participation would pose an unacceptable risk for the subject. 
Subjects also may be withdrawn from treatment or discontinued from further study 
participation for the following reasons:

The subject develops a confirmed high responder inhibitory antibody to FVIII 
(>5 BU by Nijmegen modification of the Bethesda assay) or a low responder 
inhibitory antibody (≤5 BU but ≥0.6 BU) that cannot be managed by the 
protocol-required treatment.

The subject experiences a severe anaphylactic reaction to BAX 855.

The subject requires therapy with another PEGylated product (eg, PEG-
Interferon).

The subject frequently misses administration of IP (ie, misses more than 30% of 
planned prophylactic doses within any 3-month period). 

The subject is non-compliant with study procedures, in the opinion of the 
investigator. 

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
The subject repeatedly uses another FVIII therapy for prophylaxis (in the 
absence of an acceptable justification to the sponsor) or for the treatment of 
bleeding episodes. 

The subject requires a surgical or dental procedure and is not eligible or does 
not consent for the surgery study, or participates in the surgery study and then 
refuses to resume participation in this continuation study. If the surgery study is 
closed, the subject will be withdrawn from the continuation study.

The subject experiences a life-threatening bleeding episode (eg, any 
gastrointestinal hemorrhage or intracranial hemorrhage).

The subject experiences severe trauma or requires emergency surgery with 
FVIII replacement therapy other than BAX 855.

The subject becomes pregnant. IP exposure will be discontinued. Attempts will 
be made to follow the subject through completion of the pregnancy and up to 
1 year post-delivery, if feasible. The investigator will record a narrative 
description of the course of the pregnancy and its outcome.
10. STUDY PROCEDURES
10.1 Informed Consent and Enrollment
Any patient and/or patient’s legally authorized representative who provides informed 
consent and, as appropriate, any patient who provides assent (ie, signs and dates the 
informed consent form and assent form, if applicable) is considered enrolled in the study.
10.2 Subject Identification Code
The following series of numbers will comprise the SIC: protocol identifier (eg, 261203) 
to be provided by the sponsor, a 3-digit number study site number (eg, 002) to be 
provided by the sponsor, and 3-digit subject number (eg, 003) reflecting the order of 
enrollment (ie, signing the informed consent form). For example, the third subject who 
signed an informed consent form at study site 002 will be identified as Subject 261203-
002003. All study documents (eg, eCRFs, clinical documentation, sample containers, 
drug accountability logs, etc.) will be identified with the SIC. Additionally, a uniquely 
coded SIC(s) is permitted as long as it does not contain a combination of information that 
allows identification of a subject (eg, collection of a subject’s initials and birth date
would not be permitted), in compliance with laws governing data privacy.
10.3 Screening and Study Visits
The study site is responsible for maintaining an enrollment/screening log that includes all 
subjects enrolled. The log also will serve to document the reason for screening failure. If 

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a subject does not satisfy all screening criteria, the same subject may be re-screened at a 
later date. A complete or partial re-screen may also become necessary at the discretion of
the investigator or sponsor. All screening data will be collected and reported in eCRFs, 
regardless of screening outcome. For the purpose of analysis, only the data from the most 
recent screening visit will be used. If a subject is re-screened, the End of Study eCRF 
should be completed, and a new ICF, new SIC and new eCRF are required for that 
subject. The screening procedures including laboratory evaluations must be completed 
within 45 days or repeated if more than 45 days have elapsed. Exemptions may be 
granted for administrative reasons, eg delay in timely availability of laboratory results.
The overall study design is illustrated in the Figure 1. A flow diagram of required 
procedures is presented in Supplement 20.2. Details on the procedures to be performed at 
each study visit, including screening, can be found in Supplement 20.3 Schedule of Study 
Procedures and Assessments and Supplement 20.4 Clinical Laboratory Assessments. 
10.3.1 Subjects Transitioning from Other BAX 855 Studies
Subjects transitioning from other BAX 855 studies can use the end of study assessments 
in their previous BAX 855 study for screening visit assessments in this continuation 
study. Any additional required screening assessments will be performed the same day. 
Subjects will return to the study site no later than 6 (± 1) weeks after the end of study 
visit in their prior study/continuation study’s screening visit to confirm eligibility. 
Additionally, transitioning subjects will receive IP treatment either as part of the IR 
determination of the end of study visit of the previous BAX855 study or the first IP 
treatment will be given at the screening visit of this continuation study to subjects 
transitioning from other BAX 855 studies. 
Transitioning subjectsx who decide to receive a PK-tailored treatment regimen will 
continue receiving their study-specific treatment regimen with BAX 855xi (eg, twice 
weekly 45 ± 5 IU/kg) until baseline/start of PK-tailored prophylaxis. The study-specific 
prophylactic treatment regimen will be interrupted by one infusion for PK determination 
in those subjects for whom PK is not yet available.
                                                
x
As well as subjects who are already participating in the continuation study.
xi NOTE: This refers to the type of treatment that subjects will receive with BAX 855 from this 
continuation study (not from the previous BAX 855 study).

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10.3.2 BAX 855 Naïve Subjects
BAX 855 naïve subjects will continue using their FVIII concentrate and treatment
regimen until baseline/start of prophylaxis, except for one infusion with BAX 855 for PK 
determination (for subjects receiving a PK-tailored prophylactic treatment regimen).
10.4 Medications and Non-Drug Therapies 
The following medications are not permitted within 30 days before study entry and 
during the course of the study:

Any PEGylated medication (eg, PEG-interferon)

Any investigational drug, biologic, or device, except BAX 855 in case of 
transitioning subjects
A subject who has taken any of these medications will be considered a protocol 
deviation.
The use of any FVIII concentrate other than BAX 855 during the course of the 
study following the first BAX 855 infusionxii will result in the immediate withdrawal 
of the subject. Every effort should be made to have the Completion/Termination 
Visit performed. The use of (commercial) ADVATE may be permitted for a short 
period of time for administrative reasons.
The following medications and non-drug therapies are permitted before study entry and 
during the course of the study:

Medications:
Hemostatic agents, such as tranexamic acid, are permitted, as indicated by 
the subject’s treating physician, to treat mucosal bleeding during the 
study
Any medications deemed necessary by the subject’s physician to treat or 
prevent any medical condition
Any over-the-counter medication used by the subject to treat symptoms 
or signs
Supplemental vitamins, minerals

Non-drug therapies:
Any non-drug therapy (eg, physiotherapy) deemed necessary by the 
subject’s physician to treat or prevent any medical condition
                                                
xii This infusion may be the first prophylactic infusion or infusion for the determination of IR for FVIII 
activity.

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10.5 Subject Diary and Patient Reported Outcomes
10.5.1 Subject Diary
An electronic subject diary will be provided to each subject at the screening visit to 
record the following information:
1. Infusion record for BAX 855
2. Details of bleeding episodes and response to treatment 
3. Untoward events
4. Concomitant medications (including immunizations) and non-drug therapies
5. Patient Reported Outcomes (PROs)
For each bleeding episode, the following information will be recorded by the 
subject/subject’s caregiver or by authorized, qualified personnel at the study site:

Location of bleed, eg, joint, soft tissue, muscle, body cavity, intracranial, other.

Type of bleed, ie, spontaneous (definitely no injury/trauma), injury (definitely 
due to injury/trauma), or unknown (pediatric subject was not observed by an 
adult to reliably determine and verify whether it was spontaneous or injury-
related).

Severity of bleed, eg, minor, moderate, major (see Table 3).

Date and time of onset of bleed.

Date and time of each infusion of BAX 855 required to achieve adequate 
hemostasis.

Date and time of resolution of bleeding episode.

Overall clinical efficacy rating according to the rating scale as described in 
Table 4 at 24 (±2) hours after initiation of treatment and at resolution of bleed.
Details pertaining to all treatments for each bleed, including response to treatment, will 
be recorded by study subjects/subjects’ caregiver in subject diaries provided by the 
sponsor or sponsor’s representative. 
AEs and the details of concomitant medication used coincident with the treatment of all 
acute bleeding episodes will be recorded. 
NOTE: Bleeding episodes are not to be reported as AEs (Section 12.3).
Subjects and/or their legally authorized representatives will be trained on use of the diary. 
The diary will be provided in electronic format and remain with the subject for the 
duration of the study. The investigator will review the diary for completeness and request 

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missing information periodically and in a timely manner. Untoward events recorded in 
the diary will be reported as AEs according to the investigator’s discretion and clinical 
judgment.
Subject entries in the diary will serve as source records. During study participation the 
investigator has access to the database holding the subject diary data. After study closure, 
the investigator will receive the diary records for their subjects, including audit trail 
records, in PDF format. The data will be transmitted to the eCRF by a validated transfer.
PROs will be administered at the start of prophylaxis treatment (baseline), every 
6 months and at the end of study visit. Some questionnaires may not be administered in 
all participating countries due to the unavailability of linguistically validated translations 
for certain PRO measures in some countries. In addition, subjects who are younger than 
the minimal age limit required for these assessments will not complete the assessments.
10.5.2 Patient Reported Outcomes
The following PROs will be assessed at the start of prophylaxis treatment, every 
6 months and at the end of study visit: 

Bleed and pain severity will be measured using the Haemo-SYM for subjects 
≥18 years of age

HRQoL will be assessed using the Short Form 36 (SF-36) for subjects ≥ 14 years 
of age 

HRQoL will be assessed using the Pediatric Quality of Life InventoryTM
(PedsQLxiii) for subjects < 14 years of age (for subjects aged ≥8 to < 14 years, the 
PedsQL Child report (23 items) will be completed; for subjects aged ≥ 5 to 
< 8 years, the PedsQL Parent report (23 items) will be completed; for subjects 
aged ≥2 and < 5 years, the PedsQL Parent report (21 items) will be completed; for 
subjects aged < 2 years, the PedsQL is not used)

Patient satisfaction with treatment will be assessed using the Satisfaction 
Questionnaire (for subjects aged ≥ 12 years, the subject completes the 
questionnaire; for subjects aged < 12 years, the caregiver completes it on behalf of 
the subject)

Patient Activity Level (for subjects aged ≥ 12 years, the subject completes the 
assessment; for subjects aged < 12 years, the caregiver completes it on behalf of 
the subject)
                                                
xiiiNOTE: Patients should be given the same questionnaire at follow-up that they were given at baseline, 
even if they move up an age range during the study.

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Details on each of the PROs are as follows:

Haemo-SYM Questionnaire – This is a self-administered, validated 
questionnaire designed to assess symptom severity in patients with hemophilia. 
This measure contains 17 items and includes 2 domains: Bleeds and Pain. Scores 
for each of these 2 domains can be calculated, with higher scores indicating more 
severe symptoms. 

SF-36 – The SF-36 is a self-administered, validated questionnaire designed to 
measure generic HRQoL. This 36-item questionnaire measures 8 domains, 
including: Physical functioning, Role-physical, Bodily pain, General health, 
Vitality, Social functioning, Role emotional, and Mental health. Two summary 
scores can be calculated, the Physical Component Score, and the Mental 
Component Score. Additionally, scores can be calculated for each of the 8 
domains. Higher scores indicate better health status. 

PedsQL – The PedsQL is a generic HRQoL instrument designed specifically for 
a pediatric population. Depending on the subject’s age, the PedsQL contains 23 
(for subjects aged ≥5 to < 14 years) or 21 (for subjects aged ≥2 to < 5 years) 
items and measures 7 domains: Physical Functioning, Emotional Functioning, 
School Functioning, Social Functioning, Psychosocial Summary, Physical Health, 
Total Score. Higher scores indicate better health status. 

Patient Satisfaction Questionnaire – This questionnaire is a non-validated 
measure that assesses the subject’s (or via their caregiver) level of satisfaction 
with their treatment. For BAX 855 naïve subjects and BAX 855 naïve surgery 
subjectsxiv, at the end of study visit, the questionnaire also assesses the subject’s 
preference between his previous treatment prior to the study and BAX 855. This 
questionnaire will be administered to all age groups.

Patient Activity Level – Subjects will also be asked to estimate their activity 
levels. This will consist of a few questions asking subjects (or their caregiver) to 
rate their current level of activity. These data will be collected for all age groups. 
                                                
xiv ie, subjects transitioning from the surgery study (Study 261204) into this continuation study that were 
naïve to BAX 855 prior to entry into the surgery study.

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In addition, the following will be collected where applicable, for each occurrence:

Health Resource Use – The subject (or their caregiver) will record the following 
events: (1) days missed from work/school (as appropriate) and days not able to 
perform normal activities outside of work/school due to hemophilia, (2) physician 
office visits, (3) hemophilia treatment site visits, (4) emergency room visits 
(reason and number), and (5) hospitalizations (reason, dates of hospitalization and 
associated length of stay). These data will be collected for all age groups.
10.6 Subject Completion/Discontinuation
A subject is considered to have completed the study when he/she ceases active 
participation in the study because the subject has, or is presumed to have, completed all 
study procedures according with the protocol (with or without protocol deviations).
Reasons for completion/discontinuation will be reported on the 
Completion/Discontinuation eCRF, including: completed, screen failure, AE (eg, death), 
discontinuation by subject (eg, lost to follow-up [defined as 3 documented unsuccessful 
attempts to contact the subject], dropout), physician decision (eg, pregnancy, progressive 
disease, non-compliance with IP/protocol violation(s)), study terminated by sponsor, or 
other (reason to be specified by the investigator, eg, technical problems). Regardless of 
the reason, all data available for the subject up to the time of completion/discontinuation 
should be recorded in the appropriate eCRF. 
Every effort will be made to have discontinued subjects complete the study 
completion/termination visit. If the completion/termination visit is done as an additional, 
unscheduled visit, the assessment results shall be recorded with the 
completion/termination visit. If a subject terminates participation in the study and does 
not return for the completion/termination visit, their last recorded assessments shall 
remain recorded with their last visit. The reason for discontinuation will be recorded, and 
the data collected up to the time of discontinuation will be used in the analysis and 
included in the clinical study report. If additional assessments are required, the 
assessments shall be recorded separately. Assessments to be performed at the termination 
visit (including in cases of withdraw or discontinuation) can be found in Supplement 20.3
Schedule of Study Procedures and Assessments and Supplement 20.4 Clinical Laboratory 
Assessments.
In the event of subject discontinuation due to an AE, clinical and/or laboratory 
investigations that are beyond the scope of the required study observations/assessments 
may be performed as part of the evaluation of the event. These investigations will take 

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place under the direction of the investigator in consultation with the sponsor, and the 
details of the outcome may be reported to the appropriate regulatory authorities by the 
sponsor.
10.7 Procedures for Monitoring Subject Compliance
Subject compliance with the prescribed BAX 855 prophylaxis regimen will be monitored 
by review of subject diaries as described in Section 10.5.1. Other study procedures will 
be performed under the direct supervision of the investigator/a licensed healthcare 
professional at the study site, and thus, no other procedures for monitoring will be 
employed. 
11. ASSESSMENT OF EFFICACY
11.1 Annualized Bleed Rate (ABR)
The primary measure of efficacy is the ABR. The ABR will be assessed based upon each 
individual bleeding episode, spontaneous or traumatic, recorded in the subject’s diary, 
and/or recorded in the physician/nurse/clinic notes. A bleeding episode is defined as 
subjective (eg, pain consistent with a joint bleed) or objective evidence of bleeding which 
may or may not require treatment with FVIII. Bleeding episodes occurring at the same 
anatomical location (eg, right knee) with the same etiology (eg, spontaneous vs. injury) 
within 24 hours (± 2 hours) of onset of the first episode will be considered a single 
bleeding episode. Bleeding occurring at multiple locations related to the same injury (eg, 
knee and ankle bleeds following a fall) will be counted as a single bleeding episode.
11.2 Overall Hemostatic Efficacy Rating of BAX 855 for the Treatment of Bleeding 
Episodes
The subject or their caregiver will rate the severity (minor, moderate, or major) of the 
bleeding episode and will rate the overall treatment response at 24 (± 2) hours after the 
initiation of treatment using a 4-point efficacy rating scale (Table 4). Efficacy will not be 
assessed if any other FVIII concentrate is administered for the treatment of bleeding 
episodes. Since the efficacy rating is based to a large degree on cessation of pain, the 
investigator/subject shall, in particular in case of injury-related bleeding into one or more 
than one location, consider the injury-related symptoms when performing the efficacy 
rating 24 hours after initiating treatment and at resolution of bleed.
As per Table 4, multiple infusions of BAX 855 may be administered for the treatment of 
a bleeding episode. The overall response to all infusions combined is the rating that will 
be recorded.

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Table 4
Efficacy Rating Scale for Treatment of Bleeding Episodes at 24 ± 2 Hours from the 
Initiation of Treatment and at Resolution of Bleed
Excellent
Full relief of pain and cessation of objective signs of bleeding (eg, 
swelling, tenderness, and decreased range of motion in the case of 
musculoskeletal hemorrhage) after a single infusion. No additional infusion 
is required for the control of bleeding. Administration of further infusions 
to maintain hemostasis would not affect this scoring.
Good
Definite pain relief and/or improvement in signs of bleeding after a single 
infusion. Possibly requires more than 1 infusion for complete resolution.
Fair
Slight relief of pain and slight improvement in signs of bleeding after a 
single infusion. Required more than 1 infusion for complete resolution.
None
No improvement or condition worsens.
Details pertaining to all treatments for each bleed, including response to treatment, will 
be recorded by study subjects/subjects’ caregiver in subject diaries provided by the
sponsor or sponsor’s representative. At each study visit, the investigator will review
together with the subject/subject’s caregiver the response to treatment and evaluate the
hemostatic efficacy rating. It may become necessary to re-discuss the rating with the
subject/subject’s caregiver to ensure the Rating Scale is fully understood:

Any inconsistency between the efficacy rating and the number of infusions used
to treat a bleeding episode, or a response to treatment rated as “none” must be
immediately clarified.

If 2 or more responses to treatment of unique bleeding episodes are rated “fair”, 
the investigator may re-evaluate the dosing regimen and the time from bleeding 
onset to the start of treatment. If a bleeding episode requires only one infusion but 
response to treatment is rated “fair”, the rating should be evaluated and the Rating 
Scale should be reviewed with the subject/subject’s caregiver.

If more than one infusion was given to treat a bleeding episode, and the treatment 
was rated “excellent”, additional information should be provided about the
severity of the bleeding episode (see Table 3) and/or whether additional infusions
were given to maintain hemostasis. If infusions were given to maintain hemostasis
after resolution of bleed, this should be recorded accordingly in the eCRF.

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11.3 Number of BAX 855 Infusions Needed for the Treatment of Bleeding Episodes
The number of BAX 855 infusions to treat each bleeding episode is determined by the 
subject, the subject’s caregiver, and/or investigator, and is based upon the subject’s 
response to treatment. An infusion is defined as completion of administration of the 
calculated dose of BAX 855. If an infusion is interrupted, eg, due to vascular access 
issues, and must be re-started, it will be recorded as 1 infusion. If an infusion is 
terminated for any reason prior to completion of infusion and not restarted, it will be 
recorded as an infusion; reasons for interruption of the infusion will be recorded.
11.4 Time Intervals Between Bleeding Episodes
The time interval between bleeding episodes will be calculated based upon the date and 
time reported for each bleeding episode. The subject, the subject’s caregiver, and/or 
investigator will determine when a bleeding episode has occurred (see Section 11.1
above).
11.5 Weight-Adjusted Consumption of BAX 855
Weight-adjusted consumption of BAX 855 will be determined based upon the amount of 
BAX 855 infused, as record in subject’s diary and the subject’s weight, as measured at 
the study site.
12. ASSESSMENT OF SAFETY
12.1 Adverse Events
12.1.1 Definitions
An AE is defined as any untoward medical occurrence in a subject administered an IP 
that does not necessarily have a causal relationship with the treatment. An AE can 
therefore be any unfavorable and unintended sign (eg, an abnormal laboratory finding), 
symptom (eg, rash, pain, discomfort, fever, dizziness, etc.), disease (eg, peritonitis, 
bacteremia, etc.), or outcome of death temporally associated with the use of an IP, 
whether or not considered causally related to the IP. 
12.1.1.1 Serious Adverse Event
A serious adverse event (SAE) is defined as an untoward medical occurrence that at any 
dose meets one or more of the following criteria:

Outcome is fatal/results in death (including fetal death)

Is life-threatening – defined as an event in which the subject was, in the judgment 
of the investigator, at risk of death at the time of the event; it does not refer to an 
event that hypothetically might have caused death had it been more severe.

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
Requires inpatient hospitalization or results in prolongation of an existing 
hospitalization – inpatient hospitalization refers to any inpatient admission, 
regardless of length of stay.

Results in persistent or significant disability/incapacity (ie, a substantial 
disruption of a person’s ability to conduct normal life functions)

Is a congenital anomaly/birth defect

Is a medically important event – a medical event that may not be immediately life-
threatening or result in death or require hospitalization but may jeopardize the 
subject or may require medical or surgical intervention to prevent one of the other 
outcomes listed in the definitions above. Examples of such events are: 
Intensive treatment in an emergency room or at home for allergic 
bronchospasm, blood dyscrasias, or convulsions that do not result in 
hospitalization, or development of drug dependence or drug abuse
Reviewed and confirmed seroconversion for human immunodeficiency virus 
(HIV), hepatitis A virus (HAV), hepatitis B virus (HBV), hepatitis C virus 
(HCV), hepatitis E virus (HEV), or parvovirus B19 (B19V). Seroconversion 
to HBV is only considered an SAE in the absence of vaccination; 
seroconversion of HBsAb from negative to positive will not be considered an 
SAE (or an AE)
Development of a confirmed inhibitor to FVIII with an inhibitor level 
≥0.6 BU, as measured by the Nijmegen assay modification of the Bethesda 
assay
Severe hypersensitivity/allergic reactions to BAX 855
Uncomplicated pregnancies, following maternal exposure to IP are not considered an 
(S)AE; however, any pregnancy complication or pregnancy termination by therapeutic, 
elective, or spontaneous abortion shall be considered an SAE.
12.1.1.2 Non-Serious Adverse Event
A non-serious AE is an AE that does not meet the criteria of an SAE.
12.1.1.3 Unexpected Adverse Events
An unexpected adverse event is an AE whose nature, severity, specificity, or outcome is 
not consistent with the term, representation, or description used in the Reference Safety 
Information (eg, IB, package insert). “Unexpected” also refers to the AEs that are 
mentioned in the IB as occurring with a class of drugs or as anticipated from the 
pharmacological properties of the drug, but are not specifically mentioned as occurring 
with the particular drug under investigation.

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For the purposes of this study, each unexpected AE experienced by a subject undergoing 
study-related procedures will be recorded on the AE eCRF.
12.1.1.4 Preexisting Diseases
For subjects transitioning into this continuation study from a prior BAX 855 study, any 
AEs that occurred during these other BAX 855 studies and which are still ongoing in this 
continuation study will be considered as “ongoing” and not as a preexisting disease.
AEs that were resolved in the previous BAX 855 studies will be documented as medical 
history for subjects who enter this continuation study. If a subject exited this continuation 
study to participate in the surgery study, upon return, any AEs that started and resolved 
during the surgery study will be documented as medical history.
Preexisting diseases that are present before entry in to the study are described in the 
medical history, and those that manifest with the same severity, frequency, or duration 
after IP exposure, will not be recorded as AEs. However, when there is an increase in the 
severity, duration, or frequency of a preexisting disease, the event must be described on 
the AE eCRF.
12.1.2 Assessment of Adverse Events
Each AE from the first IP exposure until study completion/discontinuation will be 
described on the AE eCRF using the medical diagnosis (preferred), or, if no diagnosis 
could be established at the time of reporting the AE, a symptom or sign, in standard 
medical terminology in order to avoid the use of vague, ambiguous, or colloquial 
expressions (see definition in Section 12.1). Each AE will be evaluated by the 
investigator for:

Seriousness as defined in Section 12.1.1.1

Severity as defined in Section 12.1.2.1

Causal relationship to IP exposure or study procedure as defined in 
Section 12.1.2.2
For each AE, the outcome (ie, recovering/resolving, recovered/resolved, 
recovered/resolved with sequelae, not recovered/not resolved, fatal, unknown) and if 
applicable action taken (ie, dose increased, dose not changed, dose reduced, drug 
interrupted, drug withdrawn, not applicable, or unknown) will also be recorded on the AE 
eCRF. Recovering/resolving AEs will be followed until resolution, medically stabilized, 
or 30 days after the study completion/termination visit, whichever comes first). If the 
severity rating for an ongoing AE changes before the event resolves, the original AE 

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report will be revised (ie, the event will not be reported as separate AE). During the 
course of any AE, the highest severity rating will be reported.
Deviations from the protocol-specified dosage (including overdosing, underdosing, 
abuse, and withdrawal, treatment errors (including incorrect route of administration, use 
of an incorrect product, and deviations from the protocol-defined dosing schedule), 
failures of expected pharmacological actions, and unexpected therapeutic or clinical 
benefits will be followed with regard to occurrence of AEs, lack of efficacy, and/or other 
observations because these events may be reportable to regulatory authorities.
Any pregnancy that occurs after administration of IP will be reported on a Pregnancy 
Form and followed-up at 1 year post-delivery, if feasible.
If an investigator becomes aware of an SAE occurring in a subject after study 
completion, the SAE must be reported on the SAE Form within 24 hours after awareness; 
no additional reporting on eCRFs is necessary.
12.1.2.1 Severity
Subjects transitioning from a prior BAX 855 study who experienced an AE that has not 
resolved, will have any ongoing AEs and changes in severity of AEs documented as part 
of the safety data for the BAX 855 continuation study.
The investigator will assess the severity of each AE using his/her clinical expertise and 
judgment based on the most appropriate description below:

Mild
The AE is a transient discomfort and does not interfere in a significant 
manner with the subject’s normal functioning level.
The AE resolves spontaneously or may require minimal therapeutic 
intervention.

Moderate
The AE produces limited impairment of function and may require therapeutic 
intervention.
The AE produces no sequela/sequelae.

Severe
The AE results in a marked impairment of function and may lead to 
temporary inability to resume usual life pattern.
The AE produces sequela/sequelae, which require (prolonged) therapeutic 
intervention.

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These severity definitions will also be used to assess the severity of an AE with a study-
related procedure(s), if necessary.
12.1.2.2 Causality
Causality is a determination of whether there is a reasonable possibility that the IP is 
etiologically related to/associated with the AE. Causality assessment includes, eg, 
assessment of temporal relationships, dechallenge/rechallenge information, association 
(or lack of association) with underlying disease, presence (or absence) of a more likely 
cause, and physiological plausibility. For each AE, the investigator will assess the causal 
relationship between the IP and the AE using his/her clinical expertise and judgment 
according to the following most appropriate algorithm for the circumstances of the AE:

Not related (both circumstances must be met)
Is due to underlying or concurrent illness, complications, concurrent 
treatments, or effects of concurrent drugs
Is not associated with the IP (ie, does not follow a reasonable temporal 
relationship to the administration of IP or has a much more likely alternative 
etiology). 

Unlikely related (either 1 or both circumstances are met)
Has little or no temporal relationship to the IP 
A more likely alternative etiology exists

Possibly related (both circumstances must be met)
Follows a reasonable temporal relationship to the administration of IP
An alternative etiology is equally or less likely compared to the potential 
relationship to the IP

Probably related (both circumstances must be met)
Follows a strong temporal relationship to the administration of IP, which may 
include but is not limited to the following: 
o
Reappearance of a similar reaction upon re-administration (positive 
rechallenge)
o
Positive results in a drug sensitivity test (skin test, etc.)
o
Toxic level of the IP as evidenced by measurement of the IP 
concentrations in the blood or other bodily fluid
Another etiology is unlikely or significantly less likely
For events assessed as not related or unlikely related, the investigator shall provide the 
alternative etiology. These causality definitions will also be used to assess the 
relationship of an AE with a study-related procedure(s), if necessary.

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12.2 Urgent Safety Measures
An urgent safety measure is an immediate action taken, which is not defined by the 
protocol, in order to protect subjects participating in a clinical trial from immediate harm. 
Urgent safety measures may be taken by the sponsor or clinical investigator, and may 
include any of the following: 

Immediate change in study design or study procedures

Temporary or permanent halt of a given clinical trial or trials

Any other immediate action taken in order to protect clinical trial participants 
from immediate hazard to their health and safety
The investigator may take appropriate urgent safety measures in order to protect subjects 
against any immediate hazard to their health or safety. The measures should be taken 
immediately and may be taken without prior authorization from the sponsor. In the 
event(s) of an apparent immediate hazard to the subject, the investigator will notify the 
sponsor immediately by phone and confirm notification to the sponsor in writing as soon 
as possible, but within 1 calendar day after the change is implemented. The sponsor will 
also ensure the responsible ethics committee is notified of the urgent measures taken in 
such cases according to local regulations.
12.3 Untoward Medical Occurrences
Untoward medical occurrences occurring before the first exposure to IP are not 
considered AEs (according to the definition of AE, see Section 12.1). However, each 
serious untoward medical occurrence experienced before the first IP exposure (ie, from 
the time of signed informed consent up to but not including the first IP exposure) will be 
described on the SAE Report. These events will not be considered as SAEs and will not 
be included in the analysis of SAEs. 
For the purposes of this study, each non-serious untoward medical occurrence 
experienced by a subject undergoing study-related procedure(s) before the first IP 
exposure will be recorded on the AE eCRF; these events will not be considered as AEs 
and will not be included in the analysis of AEs. 
For the purposes of this study, each of the following non-serious events experienced after 
the first IP exposure will not be considered an AE, and thus, not included in the analysis 
of AEs:

Hospital or study site visits for administration of BAX 855.

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
Hospitalizations for routine bleeding episode management that could be managed 
in the study site or home-setting.

Hospitalizations for planned medical or surgical procedures, eg, placement of a 
central venous line.

Hospitalization or prolongation of hospitalization intended only for social reasons.

Hospital admittance without inpatient hospitalization or emergency room
visit/admittance in itself (although the event triggering the visit may be an SAE).

Seroconversion after documented HAV/HBV vaccination prior to or during the 
study period.

Bleeding episodes/hemophilia-related events:
Bleeding episodes are part of the underlying disease and therefore are not 
considered AEs; they will be evaluated in the context of efficacy. If a bleeding 
episode was caused by an injury (eg, a fall), the injury would not be reported as an 
AE, unless it resulted in a medical finding other than a bleeding episode (eg, 
abrasion of skin; fractured tibia). However, the investigator may decide that a 
bleeding episode is an AE if the episode also would have occurred in a healthy 
individual under the same circumstances. Therefore, any hemophilia-related
event (eg, hemarthrosis, bruising, hemorrhage) will not be reported as an AE, 
but these events will be recorded on the bleeding episode eCRF. However,
hemophilia-related events meeting the criteria for seriousness (eg, a 
gastrointestinal hemorrhage requiring hospitalization) will be reported as SAEs 
and described on the SAER.
For subjects entering from other BAX 855 studies, the outcome of any ongoing AEs will 
be reported in this continuation study.
12.4 Non-Medical Complaints
A non-medical complaint (NMC) is any alleged product deficiency that relates to 
identity, quality, durability, reliability, safety and performance of the product but did not 
result in an AE. NMCs include but are not limited to the following:

A failure of a product to exhibit its expected pharmacological activity and/or 
design function, eg reconstitution difficulty

Missing components

Damage to the product or unit carton

A mislabeled product (eg, potential counterfeiting/tampering)

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
A bacteriological, chemical, or physical change or deterioration of the product 
causing it to malfunction or to present a hazard or fail to meet label claims
Any NMCs of the product will be documented on an NMC form and reported to the 
sponsor within 1 business day. If requested, defective product(s) will be returned to the 
sponsor for inspection and analysis according to procedures.
12.5 Medical, Medication, and Non-Drug Therapy History
At screening, the subject’s medical history will be described for the following body 
systems including severity (defined in Section 12.1.2.1) or surgery and start and end 
dates, if known: eyes, ears, nose, and throat; respiratory; cardiovascular; gastrointestinal; 
musculoskeletal; neurological; endocrine; hematopoietic/lymphatic; dermatological; and 
genitourinary; metabolic; infectious disease; and psychiatric.
All medications taken and non-drug therapies received from 30 days before enrollment
until completion/termination will be recorded on the concomitant medications and non-
drug therapies eCRFs.
Any prior use of any PEGylated medication (name of drug, indication, and dates of use), 
at any time in the past, will be recorded on the eCRF.
12.6 Physical Examinations
At screening and subsequent study visits (as described in Supplement 20.3), a physical 
examination will be performed on the following body systems: general appearance, head 
and neck, eyes and ears, nose and throat, chest, lungs, heart, abdomen, extremities and 
joints, lymph nodes, skin, and neurological. At screening, if an abnormal condition is 
detected, the condition will be described on the medical history eCRF. At study visits, if a 
new abnormal or worsened abnormal pre-existing condition is detected, the condition will 
be described on the AE eCRF. If the abnormal value was not deemed an AE because it 
was due to an error, due to a preexisting disease (described in Section 12.1.1.4), not 
clinically significant, a symptom of a new/worsened condition already recorded as an AE, 
or due to another issue that will be specified, the investigator will record the justification 
on the source record.
12.7 Clinical Laboratory Parameters
All assessments will be performed at a central laboratory, according to the laboratory 
manual.

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12.7.1 Hematology, Clinical Chemistry and Lipid Panel
Hematology, clinical chemistry and lipid assessments will be performed on EDTA-
anticoagulated whole blood and serum, respectively.
The hematology panel will consist of complete blood count [hemoglobin, hematocrit, 
erythrocytes (ie, red blood cell count), and leukocytes (ie, white blood cell count)] with 
differential (ie, basophils, eosinophils, lymphocytes, monocytes, neutrophils, as a 
percentage of total white blood cell count), mean corpuscular volume (MCV), mean 
corpuscular hemoglobin concentration (MCHC), CD4 counts (at screening only) and 
platelet counts. 
The clinical chemistry panel will consist of sodium, potassium, chloride, bicarbonate,
protein, albumin, alanine aminotransferase, aspartate aminotransferase, bilirubin, alkaline 
phosphatase, blood urea nitrogen, creatinine, and glucose. 
The lipid panel will consist of cholesterol, very low density lipoprotein (VLDL), low 
density lipoprotein (LDL), high density lipoprotein (HDL), and triglycerides.
Details on the sampling of blood for assessment of hematology, clinical chemistry and 
lipid parameters are presented in Supplement 20.3 and Supplement 20.4.
12.7.2 Blood Type
For subjects who do not have documentation of their blood type in their medical record, 
blood ABO blood type will be determined. 
12.7.3 Gene mutations and human leukocyte antigen (HLA) genotype
To test for FVIII gene mutations in BAX 855 naïve subjects, the cell pellets (buffy coat 
and erythrocytes) from the initial FVIII activity sample will be retained after collection of 
the plasma supernatant. Cell pellets will be labeled and stored at ≤ -70°C. FVIII gene 
mutation and HLA genotype testing will be performed at the central laboratory. The 
results will be provided to the sites. The investigator will be responsible for informing the 
subject of the test results. If results of FVIII gene mutation analysis and HLA genotype 
are already available at the study site, they will be provided to the sponsor and an 
additional analysis will be performed.
12.7.4 Factor VIII Activity, FVIII and VWF Antigen
FVIII activity will be measured using the one-stage clotting assay and the chromogenic 
assay. FVIII antigen will be measured using an enzyme-linked immunosorbent assay 
(ELISA). VWF antigen will only be measured pre-infusion for PK and IR determination 

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for FVIII activity as well as for FVIII activity trough level measurementsxv using an 
ELISA. 
12.7.4.1 Pharmacokinetic Evaluation for PK-Tailored Dosing
An abbreviated PK assessment will be performed in subjects who will receive a PK-
tailored dosing and who have not undergone a PK assessment in a previous BAX 855 
protocol or who are BAX 855 naïve. Blood samples for the PK evaluation will be 
collected at the following time points:
Subjects aged ≥ 12 years
Pre-infusion:
Within 30 minutes prior to infusion
Infusion:
60 ± 5 IU/kg BAX 855xvi
Post-infusion:
15 minutes ± 5 minutes
3 hours ± 30 minutes
9 hours ± 30 minutes
32 hours ± 2 hours
56 hours ± 4 hours
96 hours ± 4 hours
Subjects aged < 12 years
Pre-infusion:
Within 30 minutes prior to infusion
Infusion:
60 ± 5 IU/kg BAX 855xvii
Post-infusion:
15 minutes ± 5 minutes
9 hours ± 30 minutes
56 hours ± 4 hours
                                                
xv Note: Only in subjects receiving PK-tailored prophylaxis. In these subjects, VWF antigen measurement 
is optional for subjects aged < 12 years. Additionally, VWF antigen measurement is optional for 
subjects receiving a fixed dose prophylaxis.
xvi Preferably, only vials of the same lot with a nominal potency of 500 IU should be used for PK 
assessment in individual subjects. Alternatively, 1000 IU vials of the same lot could be used (see 
Section 8.7.2 for further details).
xviiPreferably, only vials of the same lot with a nominal potency of 500 IU should be used for PK 
assessment in individual subjects. Alternatively, 1000 IU vials of the same lot could be used (see 
Section 8.7.2 for further details).

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Note: The PK assessment must be performed at least 84 to preferably 96 hours following
the previous dose of BAX 855 or at least 72 hours following the previous dose of another 
FVIII concentrate and the subject must not be actively bleeding.
The PK infusion may be administered via a central line or a peripheral vein. Upon 
completion of the infusion, the butterfly catheter should be flushed with at least 2 mL of 
saline solution. All PK samples will be collected through a peripheral vein. Blood 
samples drawn during the first 3 hours after BAX 855 administration will be drawn from 
a peripheral vein in an extremity distinct from the one that was used for product infusion. 
After that time, a vein in any appropriate extremity may be used.
Subjects who have a bleeding episode during the PK assessment period will not have 
subsequent PK blood samples taken. They will be treated for the bleeding episode, as 
appropriate (ie, for subjects that transitioned from a previous BAX 855 study, the bleed 
will be treated with BAX 855; for BAX 855 naïve subjects, the bleed will be treated with 
their current FVIII treatment). Subsequently, once recovered, subjects will be re-infused 
for PK assessment following a washout period of at least 84 to preferably 96 hours 
following the previous dose of BAX 855 or at least 72 hours following the previous dose 
of another FVIII concentrate. However, depending on the time point of the bleeding 
episode during the PK evaluation, an exemption may be granted by the sponsor.
12.7.4.2 Determination of FVIII Activity Trough Levels
FVIII activity trough levels will be measured in those subjects receiving a PK-tailored 
treatment regimen to ensure that FVIII trough levels of at least 3% are maintained. The 
blood sampling for FVIII activity, TGA parameters (optional for subjects aged < 12 
years) and VWF antigen (optional for subjects aged < 12 years) should be performed 
immediately prior to the next regular prophylactic infusion, thus maintaining the 
treatment regimen-specific interval defined for each subject.
Details on the sampling of blood for determination of FVIII trough levels are presented in 
Supplement 20.3 and Supplement 20.4.
12.7.4.3 Determination of Incremental Recovery
Following a wash-out period of at least 84 to preferably 96 hours, FVIII activity trough 
levels will be measured within 30 minutes prior to the administration of 60 ± 5 IU/kg of 
BAX 855 as well as peak levels 30 ± 5 minutes after the infusion of BAX 855 for the 
determination of IR. 

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Details on the sampling of blood for determination of incremental recovery are presented 
in Supplement 20.3 and Supplement 20.4.
12.7.5 TGA Testing
The following thrombin generation assay (TGA) parameters will be assessedxviii: lag time, 
time to peak thrombin generation, peak thrombin generation, and endogenous thrombin 
potential [ETP]. These parameters will be determined using the calibrated, automated 
thrombin generation method.
Details on the sampling of blood for TGA testing are presented in Supplement 20.3 and
Supplement 20.4.
12.7.6 Immunogenicity Assays
The primary study and safety assessment is the immunogenicity of BAX 855 which will 
be assessed by measurement of the following antibodies:

Inhibitory antibodies to FVIII – measured by the Nijmegen modification of the 
Bethesda assay

Binding antibodies to FVIII, BAX 855, and PEG. Both IgG and IgM antibodies 
will be measured using an ELISA assay.

Anti-CHO antibodies
To avoid an impact of residual FVIII in plasma, subjects must undergo washout period of 
at least 84 to preferably 96 hours following the last BAX 855 infusion or at least 72 hours 
following the last infusion with another FVIII concentrate at the screening, follow-up and 
end of study visits, as well as prior to a potential unscheduled test. Additionally, the 
subject should be in a non-bleeding state. 
A low titer (responder) inhibitor is defined as ≤ 5 BU but ≥ 0.6 BU. A high titer 
(responder) inhibitor is defined as > 5 BU by Nijmegen modification of the Bethesda 
assay. Inhibitors must be confirmed by 2 separate assessments within a 2 to 4 week 
period from the central laboratory.
Inhibitory antibodies to FVIII will be measured using the Nijmegen modification of the 
Bethesda inhibitor assay.
                                                
xviii Note: Measurement of TGA parameters is optional in subjects on fixed dose prophylactic treatment 
regimen and subjects aged < 12 years on PK-tailored prophylactic treatment regimen.

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Binding antibodies (IgG and IgM) to FVIII and BAX 855, as well as to PEG, will be 
measured routinely using ELISA. Based on the variability of these tests, only samples 
with titers ≥ 1:80 can be confirmed and will be evaluated as positive. Furthermore, only 
increases of more than 2 titer steps between pre- and post-treatment samples will be 
considered positive for treatment-related antibody development. IgG subclass 1-4, IgA 
(using ELISA) and IgE antibodies (using ImmunoCaps, Phadia) may be assessed as 
clinically indicated. 
The assay for antibodies to CHO protein will use CHO protein derived from cultures of 
untransfected cells. Testing for binding of anti-CHO protein antibodies will be performed 
on citrate-anti-coagulated plasma using an ELISA employing polyclonal anti-human IgG 
antibodies. Antibody-containing samples will be identified in a screening assay followed 
by a confirmatory assay to exclude false positive results.
Details on the sampling of blood for these assessments are presented in Supplement 20.3
and Supplement 20.4. 
12.7.7 Viral Serology
Viral serology testing will include HIV-1 and HIV-2 antibody, HBsAb, HBsAg, HBcAb, 
and HCV Ab. HCV or HIV titer will be confirmed by PCR for all subjects reported as 
HCV or HIV positive. All assessments will be performed at the screening visit only. For 
BAX 855 naïve subjects, any positive test will be repeated using a new blood sample in 
case the positivity is not part of the medical history.
12.7.8 Assessment of Laboratory Values
12.7.8.1 Assessment of Abnormal Laboratory Values 
The investigator’s assessment of each laboratory value will be recorded on the eCRF. For 
each abnormal laboratory value, the investigator will determine whether the value is 
considered clinically significant or not. For clinically significant values, the investigator 
will indicate if the value constitutes an new AE (see definition in Section 12.1, and record 
the sign, symptom, or medical diagnosis on the AE eCRF), is a symptom or related to a
previously recorded AE, is due to a pre-existing disease (described in Section 12.1.1.4), 
or is due to another issue that will be specified. If the abnormal value was not clinically 
significant, the investigator will indicate the reason, ie because it is due to a preexisting 
disease, due to a lab error, or due to another issue that will be specified. Additional tests 
and other evaluations required to establish the significance or etiology of an abnormal 
value, or to monitor the course of an AE should be obtained when clinically indicated. 
Any abnormal value that persists should be followed at the discretion of the investigator.

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Any seroconversion result for HIV, HBV, or HCV shall be re-tested.
12.7.9 Biobanking
Depending on the subject’s age and local regulations, backup samples will be taken (no 
backup samples will be taken for subjects aged < 6 years; only backup samples for 
inhibitory antibodies to FVIII and citrated plasma will be taken for subjects aged ≥ 6 and 
< 12 years) and stored appropriately for additional analysis, if necessary. These samples 
may be used for re-testing, tests required per regulatory guidelines, further evaluation of 
an AE, or follow-up of other test results.
Backup samples that remain after study testing is done may be stored and used for 
additional testing (eg, further evaluation of an abnormal test or an AE). Samples will be 
stored in a coded form for no more than 2 years after the final study report has been 
completed and subsequently will be destroyed.
12.8 Vital Signs
Vital signs will include body temperature (°C or °F), respiratory rate (breaths/min), pulse 
rate (beats/min), and systolic and diastolic blood pressure (mmHg). Height (for subjects 
less than 18 years of age at the time of enrollment) (in or cm) and weight (lb or kg) will 
also be collected.
Vital signs will be measured at the screening visits, start of prophylaxis visit, follow-up 
visits, and end of study visit.
Blood pressure will be measured when subjects are in the supine position.
Vital sign values are to be recorded on the eCRF. For each abnormal vital sign value, the 
investigator will determine whether or not to report an AE (see definition in Section 12.1
and record the medical diagnosis (preferably), symptom, or sign on the AE eCRF). 
Additional tests and other evaluations required to establish the significance or etiology of 
an abnormal value, or to monitor the course of an AE should be obtained when clinically 
indicated. Any abnormal value that persists should be followed at the discretion of the 
investigator.
13. STATISTICS
13.1 Sample Size and Power Calculations
In total, approximately 250 subjects will be enrolled in this study. This sample size is 
based on having 200 evaluable subjects with a minimum of 100 EDs to BAX 855 in 
accordance with the guidance EMA/CHMP/BPWP/144533/2009. 

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13.2 Datasets and Analysis Cohorts
13.2.1 Safety Analysis Set
The safety analysis set will comprise all subjects treated with at least 1 BAX 855 
infusion. All safety analyses will be performed on the safety analysis set. 
13.2.2 Full Analysis Set
The full analysis set will be the same as the safety analysis set. All efficacy analyses will 
be performed on the full analysis set.
13.2.3 Per Protocol Analysis Set
The per protocol (PP) analysis set will comprise all subjects from the full analysis set 
who have no major deviations from the protocol affecting the study results. Major 
protocol deviations are defined in the Protocol Deviation Plan.
13.2.4 Analysis Cohorts
In addition to the overall subject group, subgroups of subjects on (1) fixed dose 
prophylactic treatment regimen and (2) PK-tailored prophylactic treatment regimen will 
be analyzed separately.
13.3 Handling of Missing, Unused, and Spurious Data
Missing data will not be imputed.
13.4 Methods of Analysis
13.4.1 Primary Outcome Measure
13.4.1.1 Primary Safety Outcome Measure
The number and proportion (Clopper-Pearson exact 95% CI) of subjects having been 
exposed to BAX 855 who develop inhibitory antibodies to FVIII (≥ 0.6 BU) will be 
provided. 
13.4.1.2 Primary Efficacy Outcome Measure
The spontaneous ABR will be assumed to have a negative binomial distribution, and the 
mean ABR (95% CI) will be estimated using a general estimating equation (GEE) model 
framework (with a logarithmic link function which is the default for the negative 
binomial distribution) with treatment regimen as a fixed effect, subject effect as a random 
effect, age at baseline as a continuous covariate, and the logarithm of follow-up time (in 
years) as an offset.

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13.4.2 Secondary Outcome Measures
13.4.2.1 Secondary Efficacy Outcome Measures
The total ABR (spontaneous and traumatic bleeding episodes) will be estimated and 
described similarly as the primary efficacy outcome measure.
The efficacy of BAX 855 in the treatment of bleeds will be summarized. It includes 
overall hemostatic efficacy rating at 24 (±2) hours after initiation of treatment and at 
resolution of bleed, number of BAX 855 infusions to control bleeding and total weight-
adjusted dose per bleeding episode (excluding any infusions given to maintain hemostasis 
after the bleeding was controlled), and time interval between bleeding episodes.
Frequency tables will be prepared for the number of BAX 855 infusions required for the 
treatment of bleeding episodes. The median number of infusions (and nonparametric 95% 
CI) will be estimated. 
Weight-adjusted consumption of BAX 855 for prophylaxis, treating bleeding episodes
(excluding any infusions given to maintain hemostasis after the bleeding is controlled)
and in total per subject will be summarized separately as average number of BAX 855 
infusions and average weight-adjusted consumption of BAX 855 per month. 
The average time interval between 2 consecutive bleeding episodes will be computed for 
each subject as the duration of the observation period divided by the number of bleeding 
episodes in the observation period. The median (95% CI) of those average time intervals 
between 2 bleeding episodes will be estimated. 
13.4.3 Pharmacokinetics
For subjects undergoing a PK assessment in this study, the following PK parameters for 
FVIII will be reported using descriptive statistics: AUC0-∞, T1/2, MRT, CL, IR, Cmax 
and Vss. 
For subjects undergoing a PK assessment in this study, an exploratory analysis of 
correlation of baseline VWF antigen to BAX 855 PK will be performed as well as the 
possible influence of any anti-PEG antibodies (preexisting or detected during study 
participation) on the PK of BAX 855, if applicable.
IR will be summarized by visit and displayed graphically over time for each subject. Also 
the change from the baseline will be described using summary statistics.

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13.4.4 Secondary Safety Outcome Measures
Frequency counts and percentages will be calculated for SAEs, occurrence of inhibitory 
antibodies to FVIII, occurrence of binding antibodies to FVIII, BAX 855 and PEG, 
occurrence of anti-CHO antibodies, and occurrence of hypersensitivity reactions. 
AEs that occurred during or after treatment will be presented in summary tables. AEs will 
be cross-tabulated for relatedness, seriousness, and severity. AEs will be categorized 
according to the MedDRA dictionary and summarized by system organ class and 
preferred term. 
Vital signs and clinical laboratory parameters will be characterized descriptively. Shift 
tables will be prepared for laboratory parameters. Clinically significant abnormal values
in routine laboratory parameters (hematology, clinical chemistry, lipids) and vital signs 
will be summarized.
13.4.5 Patient Reported Outcomes
13.4.5.1 Haemo-SYM
Bleed and pain severity will be measured using the Haemo-SYM questionnaire with 
higher scores on the Haemo-SYM indicating more severe symptoms. Changes from 
baseline in the Haemo-SYM scores will be tested for statistical significance using a 
Wilcoxon test for paired samples. Number and proportion of subjects with an
improvement in the Haemo-SYM pain subscale will be tabulated.
13.4.5.2 SF-36
HRQoL in subjects aged ≥ 14 years will be measured using the SF-36 questionnaire with 
lower scores on SF-36 indicating worse HRQoL. Changes from baseline in the SF-36 
scores will be tested for statistical significance using a Wilcoxon test for paired samples. 
Number and proportion of subjects with an improvement in the SF-36 will be tabulated.
13.4.5.3 PedsQL
HRQoL in subjects aged < 14 years will be measured using the PedsQL with lower 
scores on the PedsQL indicating worse HRQoL. Changes from baseline in the PedsQL 
scores will be tested for statistical significance using a Wilcoxon test for paired samples. 
Number and proportion of subjects with an improvement in the PedsQL will be tabulated.
13.4.6 Exploratory Outcome Measures 
Patient satisfaction with treatment, patient activity level and health resource use data will 
be descriptively summarized and listed.

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The potential influence of TGA parameters and FVIII trough levels on ABR in the three 
months after TGA/FVIII trough level measurement will be explored by scatterplots for all 
subjects who have TGA tested.
13.5 Planned Interim Analysis of the Study
A first interim safety review will be performed for license submission to the European 
Medicines Agency (EMA).
If applicable, a second interim safety review may be performed once 200 subjects have 
accumulated at least 100 EDs to BAX 855.
14. DIRECT ACCESS TO SOURCE DATA/DOCUMENTS
The investigator/study site will cooperate and provide direct access to study documents 
and data, including source documentation for monitoring by the study monitor, audits by 
the sponsor or sponsor’s representatives, review by the EC, and inspections by applicable 
regulatory authorities, as described in the Clinical Study Agreement. If contacted by an 
applicable regulatory authority, the investigator will notify the sponsor of contact, 
cooperate with the authority, provide the sponsor with copies of all documents received 
from the authority, and allow the sponsor to comment on any responses, as described in 
the Clinical Study Agreement.
15. QUALITY CONTROL AND QUALITY ASSURANCE
15.1 Investigator’s Responsibility
The investigator will comply with the protocol (which has been approved/given favorable 
opinion by the EC), ICH GCP, and applicable regulatory requirements as described in the 
Clinical Study Agreement. The investigator is ultimately responsible for the conduct of 
all aspects of the study at the study site and verifies by signature the integrity of all data 
transmitted to the sponsor. The term “investigator” as used in this protocol as well as in 
other study documents, refers to the investigator or authorized study personnel that the 
investigator has designated to perform certain duties. Sub-investigators or other 
authorized study personnel are eligible to sign for the investigator, except where the 
investigator’s signature is specifically required.
15.1.1 Final Clinical Study Report 
The investigator, or coordinating investigator(s) for multicenter studies, will sign the 
clinical study report. The coordinating investigator will be selected before study start.

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15.2 Training
The study monitor will ensure that the investigator and study site personnel understand 
all requirements of the protocol, the investigational status of the IP, and his/her regulatory 
responsibilities as an investigator. Training may be provided at an investigator’s meeting, 
at the study site, and/or by instruction manuals. In addition, the study monitor will be 
available for consultation with the investigator and will serve as the liaison between the 
study site and the sponsor.
15.3 Monitoring
The study monitor is responsible for ensuring and verifying that each study site conducts 
the study according to the protocol, standard operating procedures, other written 
instructions/agreements, ICH GCP, and applicable regulatory guidelines/requirements. 
The investigator will permit the study monitor to visit the study site at appropriate 
intervals, as described in the Clinical Study Agreement. Monitoring processes specific to 
the study will be described in the clinical monitoring plan.
15.4 Auditing
The sponsor and/or sponsor’s representatives may conduct audits to evaluate study 
conduct and compliance with the protocol, standard operating procedures, other written 
instructions/agreements, ICH GCP, and applicable regulatory guidelines/requirements. 
The investigator will permit auditors to visit the study site, as described in the Clinical 
Study Agreement. Auditing processes specific to the study will be described in the 
auditing plan.
15.5 Non-Compliance with the Protocol
The investigator may deviate from the protocol only to eliminate an apparent immediate 
hazard to the subject. In the event(s) of an apparent immediate hazard to the subject, the 
investigator will notify the sponsor immediately by phone and confirm notification to the 
sponsor in writing as soon as possible, but within 1 calendar day after the change is 
implemented. The sponsor (Baxter) will also ensure the responsible ethics committee is 
notified of the urgent measures taken in such cases according to local regulations.
If monitoring and/or auditing identify serious and/or persistent non-compliance with the 
protocol, the sponsor may terminate the investigator’s participation. The sponsor will 
notify the EC and applicable regulatory authorities of any investigator termination.
15.6 Laboratory and Reader Standardization
Not applicable; a central laboratory/reader will be used for all clinical assessments.

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16. ETHICS 
16.1 Subject Privacy
The investigator will comply with applicable subject privacy regulations/guidance as 
described in the Clinical Study Agreement.
16.2 Ethics Committee and Regulatory Authorities
Before enrollment of patients into this study, the protocol, informed consent form, any 
promotional material/advertisements, and any other written information to be provided 
will be reviewed and approved/given favorable opinion by the EC and applicable 
regulatory authorities. The IB will be provided for review. The EC’s composition or a 
statement that the EC’s composition meets applicable regulatory criteria will be 
documented. The study will commence only upon the sponsor’s receipt of 
approval/favorable opinion from the EC and, if required, upon the sponsor’s notification 
of applicable regulatory authority(ies) approval, as described in the Clinical Study 
Agreement. 
If the protocol or any other information given to the subject is amended, the revised 
documents will be reviewed and approved/given favorable opinion by the EC and 
applicable regulatory authorities, where applicable. The protocol amendment will only be 
implemented upon the sponsor’s receipt of approval and, if required, upon the sponsor’s 
notification of applicable regulatory authority(ies) approval.
16.3 Informed Consent
Investigators will choose patients for enrollment considering the study eligibility criteria. 
The investigator will exercise no selectivity so that no bias is introduced from this source. 
All patients and/or their legally authorized representative must sign an informed consent 
form before entering into the study according to applicable regulatory requirements and 
ICH GCP. An assent form may be provided and should be signed by patients less than 
18 years of age. Before use, the informed consent/assent form will be reviewed by the 
sponsor and approved by the EC and regulatory authority(ies), where applicable, (see 
Section 16.2). The informed consent/assent form will include a comprehensive 
explanation of the proposed treatment without any exculpatory statements, in accordance 
with the elements required by ICH GCP and applicable regulatory requirements. Patients
and/or their legally authorized representative(s) will be allowed sufficient time to 
consider participation in the study. By signing the informed consent/assent form, patients 
and/or their legally authorized representative(s) agree that they will complete all 

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evaluations required by the study, unless they withdraw voluntarily or are terminated 
from the study for any reason.
The sponsor will provide to the investigator in written form any new information that 
significantly bears on the subjects’ risks associated with IP exposure. The informed 
consent/assent will be updated, if necessary. This new information and/or revised 
informed consent/assent form, that have been approved by the applicable EC and 
regulatory authorities, where applicable, will be provided by the investigator to the 
subjects and/or subjects’ legally authorized representative who consented to participate in 
the study (see Section 16.3).
16.4 Data Monitoring Committee
A Data Monitoring Committee (DMC) will not be used for this study as the expected 
related AEs in this study are anticipated to be similar to that of the licensed product 
ADVATE (of which the core protein is identical to that of BAX 855; see Section 6.5 for 
more details on anticipated risks and benefits of BAX 855). Additionally, the safety is not 
expected to differ from the safety observed in the BAX 855 pivotal and pediatric study 
(Studies 261201 and 261202, respectively).
17. DATA HANDLING AND RECORD KEEPING
17.1 Confidentiality Policy
The investigator will comply with the confidentiality policy as described in the Clinical 
Study Agreement. 
17.2 Study Documentation and Case Report Forms
The investigator will maintain complete and accurate paper format study documentation 
in a separate file. Study documentation may include information defined as “source data” 
(see Section 8.8), records detailing the progress of the study for each subject, signed 
informed consent forms, correspondence with the EC and the study monitor/sponsor, 
enrollment and screening information, eCRFs, SAE reports (SAERs), laboratory reports 
(if applicable), and data clarifications requested by the sponsor.
The investigator will comply with the procedures for data recording and reporting. Any 
corrections to paper study documentation must be performed as follows: 1) the first entry 
will be crossed out entirely, remaining legible; and 2) each correction must be dated and 
initialed by the person correcting the entry; the use of correction fluid and erasing are 
prohibited.

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The investigator is responsible for the procurement of data and for the quality of data 
recorded on the eCRFs. CRFs will be provided in electronic form. 
If electronic format eCRFs are provided by the sponsor, only authorized study site 
personnel will record or change data on the eCRFs. If data is not entered on the eCRFs 
during the study visit, the data will be recorded on paper, and this documentation will be 
considered source documentation. Changes to a eCRF will require documentation of the 
reason for each change. An identical (electronic/paper) version of the complete set of 
eCRFs for each subject will remain in the investigator file at the study site in accordance 
with the data retention policy (see Section 17.3).
The handling of data by the sponsor, including data quality assurance, will comply with 
regulatory guidelines (eg, ICH GCP) and the standard operating procedures of the 
sponsor. Data management and control processes specific to the study will be described 
in the data management plan.
17.3 Document and Data Retention 
The investigator will retain study documentation and data (paper and electronic forms) in 
accordance with applicable regulatory requirements and the document and data retention 
policy, as described in the Clinical Study Agreement.
18. FINANCING AND INSURANCE
The investigator will comply with investigator financing, investigator/sponsor insurance, 
and subject compensation policies, if applicable, as described in the Clinical Study 
Agreement.
19. PUBLICATION POLICY
The investigator will comply with the publication policy as described in the Clinical 
Study Agreement. 

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20.2 Flow Diagram of Study Procedures
20.2.1 Subjects on Fixed Dose Prophylactic Treatment Regimen
20.2.1.1 Screening Visit
The screening procedures differ according to whether the subject is transitioning from a previous 
BAX 855 study (see Section 20.2.1.1.1) or is BAX 855 naïve (see Section 20.2.1.1.2). From the visit at 6 ± 
1 weeks onwards, procedures for these 2 sets of subjects are identical.
20.2.1.1.1 Subjects transitioning from other BAX 855 studies
The screening visit coincides with the end of study visit of the previous BAX 855 study. 
Informed consent must be obtained at enrollment at the latest (prior to any study-specific procedure); to 
give the patient sufficient time to review the ICF, this document should preferably be provided prior to the
end of study visit of the previous study.
At least 84 to preferably 96 hours must have elapsed since the previous BAX 855 administration and the 
subject must not be actively bleeding. 
The relevant data obtained at the end of study visit of the previous BAX 855 study will be transcribed to 
the screening visit eCRF of this continuation study, and where possible, duplication of blood draws or 
evaluations will be avoided.
The following procedures will be performed:
Pre-infusion:
Ensure informed consent has been obtained
Assess performance score (Karnofsky [≥ 16 years] or Lansky [< 16 years])
Laboratory assessments: 
o
Viral serology:

HIV: HIV-1 and HIV-2 Ab (PCR to be performed if positive)

HBV: HBsAg, HBsAb, HBcAb

HCV: HCVAb (PCR to be performed if positive)
o
CD4 count, if subject is HIV positive
Pregnancy test if female of childbearing potential
Assessment of inclusion/exclusion criteria
PROs:
o
Bleed and pain severity using Haemo-SYM (≥ 18 years), HRQoL using SF-36 (≥ 14 
years), HRQoL using PedsQL (< 14 years), patient satisfaction with treatment using the 
Satisfaction Questionnaire (all ages), and Patient Activity Level (all ages)
Provide a subject e-diary and give instructions on use.
The following data will be obtained/transcribed from the end of study visit of the previous BAX 855 study:
Medical History
Medication history
Concomitant medications
Non-drug therapies
Physical examination
Vital signs
Adverse events

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Laboratory dataxix:
o
FVIII activity (activated partial thromboplastin-based 1-stage clotting assay and 
chromogenic assay) and FVIII antigen
o
Immunogenicity tests: Inhibitory antibodies to FVIII (Nijmegen assay), binding 
antibodies (IgG and IgM) to FVIII, BAX 855, and PEG, anti-CHO antibodies
o
Hematology, clinical chemistry, and lipid panel
BAX 855 Infusion:

Administration of first fixed dose prophylactic infusion of BAX 855.
OR

If IR is to be assessed (BAX 855 pivotal: optional; BAX 855 surgery: not applicable):
Administration of 60 ± 5 IU/kg of BAX 855
Post-infusion:
At 30 ± 15 min post-infusion:
FVIII : FVIII activity (1-stage clotting assay and chromogenic assay) and FVIII antigen
Vital signs (body temperature, respiratory rate, pulse rate, and supine systolic and diastolic blood 
pressure)
Other procedures:
Dispense IP:
o
A sufficient quantity of IP will be dispensed to cover the period until the next scheduled 
visit in 6 ± 1 weeks.
20.2.1.1.2 BAX 855 naïve subjects
At least 72 hours must have elapsed since the previous FVIII administration and the subject must not be 
actively bleeding. 
Evaluations must be completed within 45 days prior to the first infusion of BAX 855 on ED1 (baseline).
The following procedures will be performed:
Ensure informed consent has been obtained
Medical history
Hemophilia history, including:
o
Confirmation of diagnosis and severity
o
Family history of hemophilia
o
Documentation of mutation, if known
o
The presence of any target joints will be documented. A target joint is defined as any 
single joint (ankles, knees, hips, or elbows) with ≥ 3 spontaneous bleeding episodes in 
any consecutive 6 month period.
o
Documentation of all FVIII replacement therapies used within the last year, including:

FVIII regimen (prophylaxis or on-demand)

Product name (or IP name and manufacturer, if applicable)

Dose (for prophylaxis, if applicable, and for treatment of bleeding episodes)

Frequency of administration (for prophylaxis)
                                                
xix Note: for subjects transitioning from the surgery study (Study 261204), FVIII activity and FVIII antigen 
and lipid panel should also be performed.

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
Estimate of average number of infusions for each bleeding episode and usual 
response
Medications received in last 30 days, and any prior history of use of any PEGylated medication (eg, 
PEG-interferon) at any time in the past, including treatment indication, date of last administration, 
and duration of treatment(s), if known
Non-drug therapies
Physical examination, including height (for subjects aged < 18 years at enrollment) and weight
Assess performance score (Karnofsky [≥ 16 years] or Lansky [< 16 years])
Vital signs (body temperature (°C), respiratory rate (breaths/min), pulse rate (beats/min), and supine 
systolic and diastolic blood pressure (mmHg)). 
Laboratory assessments:
o
Screening tests:

CD4 count, if subject is HIV positive

Viral serology (if any positive, test to be confirmed with a second sample): 

HIV: HIV-1 and HIV-2 Ab (PCR to be performed if positive)

HBV: HBsAg, HBsAb, HBcAb

HCV: HCVAb (PCR to be performed if positive)

Genetics (FVIII gene mutation analysis) and HLA-genotype, if applicable

Blood type (A, B, AB or O) if historical data not available (local laboratory)
o
FVIII assays:

FVIII activity (activated partial thromboplastin-based 1-stage clotting assay and 
chromogenic assay)

FVIII antigen
o
Immunogenicity tests:

Inhibitory antibodies to FVIII (Nijmegen assay)

Binding antibodies (IgG and IgM) to FVIII, BAX 855, and PEG

Anti-CHO antibodies
o
Hematology, clinical chemistry, and lipid panel
Pregnancy test if female of childbearing potential
Assessment of inclusion/exclusion criteria
Provide a subject e-diary and give instructions on use
20.2.1.2 ED1 (Baseline):
Only Applicable to BAX 855 Naïve Subjects
At least 72 hours must have elapsed since the previous administration of any FVIII concentrate, and the 
subject must not be actively bleeding.
The following procedures will be performed:
Pre-infusion:
Confirmation of eligibility
Physical examination, including height (for subjects aged < 18 years at enrollment) and body weight
Review and discuss subject e-diary, including:
o
Review bleeding episodes and their treatment
o
Adverse events
o
Concomitant medications and non-drug therapies

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Laboratory assessments within 30 minutes of start of infusion:
o
FVIII activity and antigen
o
Immunogenicity tests
o
VWF antigen (optional)
o
TGA parameters (optional)
PROs:
o
Bleed and pain severity using Haemo-SYM (≥ 18 years), HRQoL using SF-36 
(≥14 years), HRQoL using PedsQL (< 14 years), patient satisfaction with treatment 
using the Satisfaction Questionnaire (all ages), and Patient Activity Level (all ages)
Vital signs (within 15 minutes of start of infusion)
Determination of IR:
Infusion of 60 ± 5 IU/kg BAX 855
Post-infusion:
At 30 ± 15 min post-infusion:
FVIII activity and antigen
TGA parameters (optional)
Vital signs
Other procedures:
Dispense IP:
o
A sufficient quantity of IP will be dispensed to cover the period until the next scheduled 
visit in 6 ± 1 weeks.
20.2.1.3 Follow-up Visits

At 6 (± 1) weeks from screening (transitioning subjects) or baseline (BAX 855 naïve subjects)

Subsequently: Every 3 months (± 2 weeks) starting from screening (transitioning subjects) 
or baseline (BAX 855 naïve subjects)
From this timepoint, procedures for subjects on the fixed dose prophylactic regimen are identical, apart 
from confirmation of eligibility for transitioning subjects at the 6 ± 1 weeks visit (which was done at ED1 
for BAX 855 naïve subjects).
At least 84 to preferably 96 hours must have elapsed since the previous BAX 855 administration and the 
subject must not be actively bleeding. 
The following assessments will be performed:
Pre-infusion:
Confirmation of eligibility for transitioning subjects (at the 6 ± 1 weeks visit)
Physical examination, including height (for subjects aged < 18 years at enrollment) and body weight
Review and discuss subject e-diary, including:
o
Review bleeding episodes and their treatment
o
Adverse events
o
Concomitant medications and non-drug therapies
Laboratory assessments within 30 minutes of start of infusion
o
FVIII activity and antigen

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o
TGA parameters (optional)
o
VWF antigen (optional)
o
Immunogenicity tests
o
Hematology, clinical chemistry and lipid panel
Vital signs (within 15 minutes of IP infusion)
Determination of IR
Infusion of 60 ± 5 IU/kg BAX 855
Post-infusion:
At 30 ± 15 min post-infusion:
FVIII activity and antigen
TGA parameters (optional)
Vital signs
Other procedures:
Dispense IP:
o
A sufficient quantity of IP will be dispensed to cover the period until the next scheduled 
visit.
Intermittent procedures, every 6 months:
Every 6 months PROs will be assessed:
o
Bleed and pain severity using Haemo-SYM (≥ 18 years), HRQoL using SF-36 
(≥14 years), HRQoL using PedsQL (< 14 years), patient satisfaction with treatment 
using the Satisfaction Questionnaire (all ages), and Patient Activity Level (all ages).
In subjects who are HIV positive, CD4 counts should be tested every 6 months.
20.2.1.4 End of Study Visit
The procedures listed here should also be performed if a subject withdraws or discontinues from the study.
At least 84 to preferably 96 hours must have elapsed since the previous BAX 855 administration and the 
subject must not be actively bleeding. 
The following assessments will be performed:
Pre-infusion:
Physical examination, including height (for subjects aged < 18 years at enrollment) and body weight
Pregnancy test if female of childbearing potential
Collection of subject e-diary and review of entries and discussion with subject
o
Review bleeding episodes and their treatment
o
Adverse events
o
Concomitant medications and non-drug therapies
PROs:
o
Bleed and pain severity using Haemo-SYM (≥ 18 years), HRQoL using SF-36 
(≥14 years), HRQoL using PedsQL (< 14 years), patient satisfaction with treatment 
using the Satisfaction Questionnaire (all ages), and Patient Activity Level (all ages)
Laboratory assessments within 30 minutes of start of infusion:
o
FVIII activity and antigen
o
TGA parameters (optional)

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o
VWF antigen(optional)
o
Immunogenicity tests
o
Hematology, clinical chemistry and lipid panel
Vital signs (within 15 minutes of IP infusion)
Determination of IR
Infusion of 60 ± 5 IU/kg BAX 855
Post-infusion:
At 30 ± 15 min post-infusion:
FVIII activity and antigen
TGA parameters (optional)
Vital signs 

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20.2.2 Subjects on PK-Tailored Prophylactic Treatment Regimen
20.2.2.1 Screening Visit
Subjects who decide to switch to a PK-tailored treatment regimen at any time during the continuation study 
will start with the procedures from the PK assessment visit (if one is needed), but the screening visit is not 
applicable.
The screening procedures differ according to whether the subject is transitioning from a previous 
BAX 855 study (see Section 20.2.1.1.1) or is BAX 855 naïve (see Section 20.2.1.1.2). 
20.2.2.1.1 Subjects transitioning from other BAX 855 studies
The screening visit coincides with the end of study visit of the previous BAX 855 study. 
Informed consent must be obtained at enrollment at the latest (prior to any study-specific procedure); to 
give the patient sufficient time to review the ICF, this document should preferably be provided prior to the 
end of study visit of the previous study.
At least 84 to preferably 96 hours must have elapsed since the previous BAX 855 administration and the 
subject must not be actively bleeding. 
The relevant data obtained at the end of study visit of the previous study will be transcribed to the screening 
visit eCRF of this continuation study, and where possible, duplication of blood draws or evaluations will be 
avoided.
The following procedures will be performed:
Ensure informed consent has been obtained
Assess performance score (Karnofsky [≥ 16 years] or Lansky [< 16 years])
Laboratory assessments: 
o
Viral serology:

HIV: HIV-1 and HIV-2 Ab (PCR to be performed if positive)

HBV: HBsAg, HBsAb, HBcAb

HCV: HCVAb (PCR to be performed if positive)
o
CD4 count, if subject is HIV positive
Pregnancy test if female of childbearing potential
Assessment of inclusion/exclusion criteria
Provide a subject e-diary and give instructions on use.
The following data will be obtained/transcribed from the end of study visit of the previous BAX 855 study:
Medical History
Medication history
Concomitant medications
Non-drug therapies
Physical examination
Vital signs
Adverse events
Laboratory dataxx:
                                                
xx Note: For subjects transitioning from the surgery study (Study 261204), FVIII activity and FVIII 
antigen and lipid panel should also be performed.

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o
FVIII assays: FVIII activity (activated partial thromboplastin-based 1-stage clotting assay 
and chromogenic assay) and FVIII antigen (pre- and post-infusion values, if IR assessed 
in previous study’s end of study visit)
o
Immunogenicity tests: Inhibitory antibodies to FVIII (Nijmegen assay), binding 
antibodies (IgG and IgM) to FVIII, BAX 855, and PEG, anti-CHO antibodies
o
Hematology, clinical chemistry, and lipid panel
BAX855 Infusion:

Administration of first prophylactic infusion of BAX 855 using a fixed dose prophylactic 
treatment regimen as used in the previous study.
OR

If IR is to be assessed (BAX855 pivotal: optional; BAX855 surgery: not 
applicable):Administration of 60± 5 IU/kg of BAX855
At 30 ± 15 min post-infusion:
o
FVIII: FVIII activity (1-stage clotting assay and chromogenic assay) and FVIII antigen
o
Vital signs (body temperature, respiratory rate, pulse rate, and supine systolic and 
diastolic blood pressure)
Transitioning subjects who have undergone a PK assessment in a previous BAX 855 study do not need to 
undergo a PK assessment in this study, but can start their PK-tailored prophylactic treatment at the next 
visit (Baseline visit) at 6 ± 1 weeks after the screening visit. A sufficient quantity of IP will be dispensed to 
continue with their previous prophylactic BAX 855 treatment regimen until the Baseline visit. Subjects 
who received on-demand treatment in the pivotal study (Study 261201) will first receive a fixed dose 
prophylactic treatment regimen (as outlined in section 8.7.3.1) until their dose and frequency is determined 
and the first PK-tailored dose administered.
See Section “Baseline visit / Start of prophylaxis” (see Section 20.2.2.3) for further procedures
Those who have not undergone a PK assessment in a previous BAX 855 study must attend a PK 
assessment visit. A sufficient quantity of IP will be dispensed to continue with their previous BAX 855 
treatment regimen until the PK assessment within 45 days from screening.
See Section “PK assessment for BAX 855 naïve subjects and transitioning subjects with no prior PK 
assessment“ (see Section 20.2.2.2) for further procedures

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20.2.2.1.2 BAX 855 naïve subjects
At least 72 hours must have elapsed since the previous FVIII administration and the subject must not be 
actively bleeding. 
Evaluations must be completed within 45 days prior to the PK assessment. 
The following procedures will be performed:
Ensure informed consent has been obtained.
Medical history
Hemophilia history, including:
o
Confirmation of diagnosis and severity
o
Family history of hemophilia
o
Documentation of mutation, if known
o
The presence of any target joints will be documented. A target joint is defined as any 
single joint (ankles, knees, hips, or elbows) with ≥ 3 spontaneous bleeding episodes in 
any consecutive 6 month period.
o
Documentation of all FVIII replacement therapies used within the last year, including:

FVIII regimen (prophylaxis or on-demand)

Product name (or IP name and manufacturer, if applicable)

Dose (for prophylaxis, if applicable, and for treatment of bleeding episodes)

Frequency of administration (for prophylaxis)

Estimate of average number of infusions for each bleeding episode and usual 
response
Medications received in last 30 days, and any prior history of use of any PEGylated medication (eg, 
PEG-interferon) at any time in the past, including treatment indication, date of last administration, 
and duration of treatment(s), if known
Non-drug therapies
Physical examination, including height (for subjects aged < 18 years at enrollment) and weight
Assess performance score (Karnofsky [≥ 16 years] or Lansky [< 16 years])
Vital signs (body temperature (°C), respiratory rate (breaths/min), pulse rate (beats/min), and supine 
systolic and diastolic blood pressure (mmHg)). 
Laboratory assessments:
o
Screening tests:

CD4 count, if subject is HIV positive

Viral serology (if any positive, test to be confirmed with a second sample) : 

HIV: HIV-1 and HIV-2 Ab

HBV: HBsAg, HBsAb, HBcAb

HCV: HCVAb (PCR to be performed if positive)

Genetics (FVIII gene mutation analysis) and HLA-genotype 

Blood type (A, B, AB or O) if historical data not available (local laboratory)
o
FVIII assays:

FVIII activity (activated partial thromboplastin-based 1-stage clotting assay and 
chromogenic assay)

FVIII antigen

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o
Immunogenicity tests:

Inhibitory antibodies to FVIII (Nijmegen assay)

Binding antibodies (IgG and IgM) to FVIII, BAX 855, and PEG

Anti-CHO antibodies
o
Hematology, clinical chemistry, and lipid panel
Pregnancy test if female of childbearing potential
Assessment of inclusion/exclusion criteria
Provide a subject e-diary and give instructions on use
20.2.2.2 PK Assessment
For BAX 855 naïve subjects and transitioning subjects with no prior PK assessment
Blood sampling after infusion of BAX 855 for PK assessments will be performed over a 4-day period for 
subjects aged ≥ 12 years or a 2.5 day period for subjects aged < 12 years. A minimum wash-out period of 
84 to preferably 96 hours prior to the PK infusion is required for subjects transitioning from another BAX 
855 study and 72 hours prior to PK infusion for BAX 855 naïve subjects on treatment with any other FVIII 
concentrate, and the subject must not be actively bleeding.
The following assessments will be performed:
Pre-infusion
Confirmation of eligibility
Physical examination, including height (for subjects aged < 18 years at enrollment) and body weight
Review and discuss subject e-diary, including:
o
Review bleeding episodes and their treatment
o
Adverse events
o
Concomitant medications and non-drug therapies
Laboratory assessments within 30 minutes of start of infusion:
o
FVIII activity and antigen
o
Immunogenicity tests (BAX855 naïve subjects only)
o
TGA parameters and VWF antigen (optional in subjects aged < 12 years)

Vital signs (within 15 minutes of start of infusion)
Infusion for PK assessment:

Infusion of 60 ± 5 IU/kg BAX 855
Post-infusion:
Laboratory assessments in subjects aged ≥ 12 years:
o
FVIII activity, FVIII antigen and TGA parameters at the following post-infusion time 
points: 15 min ± 5 min, 3 h ± 30 min, 9 h ± 30 min, 32 h ± 2 h, 56 h ± 4 h, and 96 h ± 4 h
Laboratory assessments in subjects aged < 12 years:
o
FVIII activity and antigen at the following post-infusion time points: 15 min ± 5 min, 9 h 
± 30 min, 56 h ± 4 h
o
Optional TGA parameters at the same timepoints

Vital signs at 30 min ± 5 min post-infusion

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Other procedures:
Dispense IP to transitioning subjects:
o
A sufficient quantity of IP will be dispensed to cover the period until the next scheduled 
visit in 6 ± 1 weeks.
20.2.2.3 Baseline Visit / Start of Prophylaxis 
This visit takes place 6 ± 1 weeks following the PK assessment, or following screening if a PK was already 
available in case of transitioning subjects. This visit will then coincide with confirmation of eligibility. It is 
the baseline time point for all subsequent visits.
At least 84 to preferably 96 hours must have elapsed since the previous BAX 855 administration and at 
least 72 hours since the previous administration of any other FVIII concentrate in case of BAX855 naïve 
subjects, and the subject must not be actively bleeding.
The following procedures will be performed:
Pre-infusion:
Confirmation of eligibility for transitioning subjects with previous PK data
Physical examination, including height (for subjects aged < 18 years at enrollment) and body weight
Review and discuss subject e-diary, including:
o
Review bleeding episodes and their treatment (not applicable for BAX855 naïve subjects)
o
Adverse events
o
Concomitant medications and non-drug therapies
Laboratory assessments within 30 minutes of start of infusion:
o
FVIII activity and antigen
o
TGA parameters and VWF antigen (optional in subjects aged <12 years)
o
Immunogenicity tests
o
Hematology, clinical chemistry, and lipid panel
PROs:
o
Bleed and pain severity using Haemo-SYM (≥ 18 years), HRQoL using SF-36 
(≥14 years), HRQoL using PedsQL (< 14 years), patient satisfaction with treatment 
using the Satisfaction Questionnaire (all ages), and Patient Activity Level (all ages)

Vital signs (within 15 minutes of start of infusion)
Determination of IR:

Infusion of 60 ± 5 IU/kg BAX 855
Post-infusion:
At 30 ± 15 min post-infusion:
FVIII activity and antigen
TGA parameters (optional in subjects aged < 12 years)
Vital signs
Other procedures:
Dispense IP:
o
A sufficient quantity of IP will be dispensed to cover the period until the next scheduled 
visit in 4 ± 1 week.

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20.2.2.4 Follow-up Visits: At 4 (± 1) Weeks, 8 (± 1) Weeks, 18 (± 2) Weeks from
Baseline Visit
No wash-out period is required for this visit and the patient should not be in a bleeding state.
The visit should be performed immediately prior to the next regular prophylactic infusion in order to 
determine adequate FVIII trough levels.
The following assessments will be performed:
Pre-infusion:
Physical examination, including height (for subjects aged < 18 years at enrollment) and body weight
Review and discuss subject e-diary, including:
o
Review bleeding episodes and their treatment
o
Adverse events
o
Concomitant medications and non-drug therapies
Laboratory assessments within 30 minutes of start of infusion:
o
FVIII activity and antigen 
o
TGA parameters and VWF antigen (optional in subjects aged < 12 years)
Vital signs (within 15 minutes of IP infusion)
Infusion of the PK-tailored prophylactic dose of BAX 855
Other procedures:
Dispense IP:
o
A sufficient quantity of IP will be dispensed to cover the period until the next scheduled 
visit 
Upon availability of the FVIII trough levels dose adjustments, if applicable
20.2.2.5 Follow-up Visits: Every 3 Months (± 2 Weeks) Starting from Baseline Visit
A washout period of at least 84 h to preferably 96 hours must have elapsed since the previous BAX 855 
administration and the subject must not be actively bleeding. 
The following assessments will be performed:
Pre-infusion:
Physical examination, including height (for subjects aged < 18 years at enrollment) and body weight
Review and discuss subject e-diary, including:
o
Review bleeding episodes and their treatment
o
Adverse events
o
Concomitant medications and non-drug therapies
Laboratory assessments within 30 minutes of start of infusion:
o
FVIII activity and antigen
o
TGA parameters and VWF antigen (optional in subjects aged < 12 years)
o
Immunogenicity tests
o
Hematology, clinical chemistry and lipid panel
Vital signs (within 15 minutes of IP infusion)

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Determination of IR:
Infusion of 60 ± 5 IU/kg BAX 855
Post-infusion 
At 30 ± 15 min post-infusion:
FVIII activity and antigen 
TGA parameters (optional in subjects aged < 12 years)
Vital signs
Other procedures:
Dispense IP:
o
A sufficient quantity of IP will be dispensed to cover the period until the next scheduled 
visit (ie, for 5 or 8 weeks or 3.5 months, depending on the visit).
Dose adjustments as needed.
Intermittent procedures, every 6 months:
Every 6 months PROs will be assessed: 
o
Bleed and pain severity using Haemo-SYM (≥ 18 years), HRQoL using SF-36 
(≥14 years), HRQoL using PedsQL (< 14 years), patient satisfaction with treatment 
using the Satisfaction Questionnaire (all ages), and Patient Activity Level (all ages).
In subjects who are HIV positive, CD4 counts should be tested every 6 months.
20.2.2.6 End of Study Visit
The procedures listed here should also be performed if a subject withdraws or discontinues from the study.
At least 84 to preferably 96 hours must have elapsed since the previous BAX 855 administration and the 
subject must not be actively bleeding. 
The following assessments will be performed:
Pre-infusion:
Physical examination, including height (for subjects aged < 18 years at enrollment) and body weight
Collection of subject e-diary and review of entries and discussion with subject
o
Review bleeding episodes and their treatment
o
Adverse events
o
Concomitant medications and non-drug therapies
PROs:
o
Bleed and pain severity using Haemo-SYM (≥ 18 years), HRQoL using SF-36 
(≥14 years), HRQoL using PedsQL (< 14 years), patient satisfaction with treatment 
using the Satisfaction Questionnaire (all ages), and Patient Activity Level (all ages)
Laboratory assessments within 30 minutes of start of infusion:
o
FVIII activity and antigen assays 
o
TGA parameters and VWF antigen (optional in subjects aged < 12 years)
o
Immunogenicity tests
o
Hematology, clinical chemistry and lipid panel
Vital signs (within 15 minutes of IP infusion)

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Determination of IR:
Infusion of 60 ± 5 IU/kg BAX 855
Post-infusion:
At 30 ± 15 min post-infusion:
FVIII activity and antigen
TGA parameters (optional in subjects aged < 12 years)
Vital signs

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20.3 Schedule of Study Procedures and Assessments
20.3.1 Subjects Transitioning from Other BAX 855 Studies on Fixed Dose Prophylactic Treatment Regimen
Procedures/Assessments
Screening Visita
Follow-Up Visits
End of Study Visitb
6 ± 1 Weeks Following 
Screening 
Every 3 Months 
± 2 Weeks Following 
Screening
Informed consentc
X
Eligibility criteria
X
Confirmation of eligibility
X
Medical history
*
Medication history
*
Concomitant medicationsd
*
X
X
X
Non-drug therapiesd
*
X
X
X
Physical exam
*
X
X
X
Adverse eventsd
*
X
X
X
Laboratoriese
*
X
X
X
Vital signsf
*
X
X
X
Bleeding episodes and their 
treatmentd
*
X
X
X
Pregnancy testg
X
X
PROsh
X
Xi
X
Patient e-diaryj
X
X
X
X
IR determinationk
X
X
X
X
Dispense IP
Xk
X
X
a
The screening visit coincides with the end of study visit of the previous BAX 855 study. The procedures/assessments marked with an asterisk (*) 
will be transcribed from the end of study visit of the previous BAX 855 study. The following assessments are not part of the end of study
assessments of the previous BAX 855 study and must be performed at screening to ensure eligibility: Performance score (Karnofsky or Lansky), 
viral serology (see Section 20.4.1), and pregnancy test if female of childbearing potential. Additionally, for subjects transitioning from the surgery 
study (Study 261204), FVIII assays and lipid panel (see Section 20.4.1) should also be performed.
b
Including cases of withdrawal or discontinuation. 
Continued on Next Page

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Continued
c
Occurs at enrollment at latest (prior to any study-specific procedure); to give the patient sufficient time to review the ICF, this document should 
preferably be provided prior to the end of study visit of the previous study.
d
Indicates that concomitant medications, non-drug therapies, adverse events, and bleeding episodes and their treatment will be continuously reviewed 
and specifically assessed at these times by the study sites and discussed with the subject.
e
For laboratory assessments, see Section 20.4.1.
f
Vital signs to include body temperature (ºC), respiratory rate (breaths/min), pulse rate (beats/min), and systolic and diastolic blood pressure (mmHg). 
g
A hCG urine pregnancy test will be done on all females of childbearing potential at the screening and end of study visit.
h
PROs to include the following depending on patient age:  bleed and pain severity using Haemo-SYM (≥18 years), HRQoL using SF-36 (≥ 14 years), 
HRQoL using PedsQL (< 14 years), patient satisfaction with treatment using the Satisfaction Questionnaire (all ages), and Patient Activity Level (all 
ages). PROs will be measured at start of prophylaxis treatment, every 6 months and at end of study.
i
In addition to the screening and end of study visit, PROs will be assessed every 6 months following screening.
j
E-diaries will be given out at screening and will be used to document bleeds, treatment administered and response to BAX 855, untoward events, 
concomitant medications and health resource use data. E-diaries are reviewed and discussed with the subject at each study visit.
k
The first IP treatment at screening serves for the determination of the baseline IR and the end of study IR of the previous study, if applicable.

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20.3.2 BAX 855 Naïve Subjects on Fixed Dose Prophylactic Treatment Regimen
Procedures/Assessments
Screening Visita
ED1 (Baseline)b
Follow-Up Visits
End of Study Visitc
6 ± 1 Weeks 
Following Baseline
Every 3 Months 
± 2 Weeks 
Following Baseline
Informed consentd
X
Eligibility criteria
X
Confirmation of eligibility
X
Medical historye
X
Medication historyf
X
Concomitant medicationsg
X
X
X
X
Non-drug therapiesg
X
X
X
X
X
Physical examinationh
X
X
X
X
X
Adverse eventsg
X
X
X
X
Laboratoriesi
X
X
X
X
X
Vital signsj
X
X
X
X
X
Bleeding episodes and their 
treatmentg
X
X
X
X
Pregnancy testk
X
X
PROsl
X
Xm
X
Patient e-diaryn
X
X
X
X
X
IR determination
X
X
X
X
Dispense IP
X
X
X
a
The screening visit procedures, including laboratory evaluations, are to be completed within 45 days prior to the first infusion of BAX 855 on ED1.
b
Determination of baseline incremental recovery with 60 ± 5 IU/kg of BAX 855.
c
Including cases of withdrawal or discontinuation.
d
Occurs at enrollment at latest (prior to any study-specific procedure).
e
Medical history to include hemophilia history (confirmation of diagnosis & severity; family history of hemophilia; documentation of a mutation, if 
known; and presence of any target joints).
f
Medication history to include documentation of all FVIII replacement therapies used within the last year, any prior history of use of any PEGylated 
medication (eg, PEG-interferon) at any time in the past, and other medications in the last 30 days.
Continued on Next Page

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Continued
g
Indicates that concomitant medications, non-drug therapies, adverse events, and bleeding episodes and their treatment will be continuously reviewed
and specifically assessed at these times by the study site and discussed with the subject.
h
Physical examination to include a measurement of height (cm) (for subjects aged < 18 years at enrollment) and weight (kg) and performance score 
(Karnofsky or Lansky) at screening.
i
For laboratory assessments, see Section 20.4.2.
j
Vital signs to include body temperature (ºC), respiratory rate (breaths/min), pulse rate (beats/min), and systolic and diastolic blood pressure (mmHg). 
k
A hCG urine pregnancy test will be done on all females of childbearing potential at the screening and end of study visit.
l
PROs to include the following depending on patient age:  bleed and pain severity using Haemo-SYM (≥ 18 years), HRQoL using SF-36 (≥ 14 years), 
HRQoL using PedsQL (< 14 years), patient satisfaction with treatment using the Satisfaction Questionnaire (all ages), and Patient Activity Level (all 
ages).
m
In addition to the baseline and end of study visit, PROs will be assessed every 6 months following baseline.
n
E-diaries will be given out at screening and will be used to document bleeds, treatment administered and response to BAX 855, untoward events, 
concomitant medications and health resource use data. E-diaries are reviewed and discussed with the subject at each study visit.

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20.3.3 Subjects on PK-Tailored Prophylactic Treatment Regimen (Transitioning and BAX 855 Naïve Subjects)
Procedures/Assessments
Screening 
Visita
PK Assessmentb
Baseline/Start of 
Prophylaxis 
6 ± 1 Weeksc
Follow-Up Visits
End of Study 
Visitd
4 ± 1, 8 ± 1, 
18 ± 2 Weeks 
Following 
Baseline
Every 
3 Months 
± 2 Weeks 
Following 
Baseline
Informed consente
X
Eligibility criteria
X
Confirmation of eligibility
X
Tb
Medical historyf
T* / N
Medication historyg
T* / N
Concomitant medicationsh
T* / N
X
X
X
X
X
Non-drug therapiesh
T* / N
X
X
X
X
X
Physical exami
T* / N
X
X
X
X
X
Adverse eventsh
T*
X
X
X
X
X
Laboratoriesj
T* / N
X
X
X
X
X
Vital signsk
T* / N
X
X
X
X
X
Bleeding episodes and their 
treatmenth
T*
T
T
X
X
X
Pregnancy testl
X
X
PROsm
X
Xn
X
Patient e-diaryo
X
X
X
X
X
X
PK determination
X
IR determination
T*p
X
X
X
Trough levels
X
Dispense IP
T
X
X
X
X
Abbreviations:  T = transitioning subjects; N = BAX 855 naïve subjects; X = all subjects (transitioning, BAX855 naïve subjects and subjects who are 
already in the continuation study and have not yet undergone PK).
Continued on Next Page

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Continued
a
The screening visit procedures, including laboratory evaluations, are to be completed within 45 days prior to the infusion of BAX 855 at the PK 
assessment. The procedures/assessments marked with an asterisk (*) will be transcribed from the end of study visit of the previous BAX 855 study 
for transitioning subjects. However, the following assessments are not part of the end of study assessments of the previous BAX 855 study and must 
be performed at screening to ensure eligibility: Performance score (Karnofsky or Lansky), viral serology (see Section 20.4.3), and pregnancy test if 
female of childbearing potential. Additionally, for subjects transitioning from the surgery study (Study 261204), FVIII assays and lipid panel (see 
Section 20.4.3) should also be performed. Note: Subjects can decide at any time during the continuation study to receive a PK-tailored dosing 
regimen. For this purpose, all the study visits starting from the PK assessment, if needed, will apply, however, the screening visit is not applicable.
b
PK assessment does not need to be performed in transitioning subjects who have already undergone a PK assessment in a previous BAX 855 study. 
For these subjects the baseline/start of prophylaxis visit will be the first visit after the screening visit and eligibility will be confirmed at this visit.
c
Baseline/start of PK-tailored prophylaxis starts 6±1 week following either PK determination in case the patient has not undergone a PK in a previous 
BAX855 study or 6±1 week following screening if a PK is already available. This visit will then coincide with confirmation of eligibility.
d
Including cases of withdrawal or discontinuation.
e
Occurs at enrollment at latest (prior to any study-specific procedure). For transitioning subjects from other BAX 855 studies, to give the patient 
sufficient time to review the ICF, this document should preferably be provided prior to the end of study visit of the previous study.
f
Medical history to include hemophilia history (confirmation of diagnosis & severity; family history of hemophilia; documentation of a mutation, if 
known; and presence of any target joints).
g
Medication history to include documentation of all FVIII replacement therapies used within the last year, any prior history of use of any PEGylated 
medication (eg, PEG-interferon) at any time in the past, and other medications in the last 30 days.
h
Indicates that concomitant medications, non-drug therapies, adverse events, and bleeding episodes and their treatment will be continuously reviewed 
and specifically assessed at these times by the study site and discussed with the subject.
i
Physical examination to include a measurement of height (cm) (for subjects aged < 18 years at enrollment) and weight (kg) and performance score 
(Karnofsky or Lansky) at screening.
j
For laboratory assessments, see Section 20.4.
k
Vital signs to include body temperature (ºC), respiratory rate (breaths/min), pulse rate (beats/min), and systolic and diastolic blood pressure (mmHg).
l
A hCG urine pregnancy test will be done on all females of childbearing potential at the screening and end of study visit.
m
PROs to include the following depending on patient age: bleed and pain severity using Haemo-SYM (≥18 years), HRQoL using SF-36 (≥ 14 years), 
HRQoL using PedsQL (< 14 years), patient satisfaction with treatment using the Satisfaction Questionnaire (all ages), and Patient Activity Level (all 
ages).
n
In addition to the baseline and end of study visit, PROs will be assessed every 6 months following baseline.
o
E-diaries will be given out at screening and will be used to document bleeds, treatment administered and response to BAX 855, untoward events, 
concomitant medications and health resource use data. E-diaries are reviewed and discussed with the subject at each study visit.
p
For transitioning subjects, IR determination may be performed at screening as part of the end of study visit of the previous BAX 855 study.

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20.4 Clinical Laboratory Assessments
20.4.1 Subjects Transitioning from Other BAX 855 Studies on Fixed Dose Prophylactic Treatment Regimen
Assessmentsa
Screening Visitb
Follow-Up Visits
End of Study Visitd
6 ± 1 Week 
Following Screeningc
Every 3 Months 
± 2 Weeks
Following Screeningc
FVIII pre-infusione
*
P
P
P
FVIII post-infusione
*
P
P
P
TGA pre-infusion 
(optional)
P
P
P
TGA post-infusion 
(optional)
P
P
P
VWF antigen (pre-
infusion) (optional)
P
P
P
Immunogenicity assaysf
*
P
P
P
Hematologyg
*
W
W
W
CD4 count
W
Wh
Clinical chemistryi
*
S
S
S
Lipid panelj
*
S
S
S
Viral serologyk
S
Abbreviations:  W = whole blood; P = plasma; S = serum.
a
At all visits subjects must not be actively bleeding and a washout period of at least 84 to preferably 96 hours following the previous dose of BAX 
855 should be observed for blood sampling. All laboratory tests will be performed at a central laboratory.
b
The results of the laboratory assessments marked with an asterisk (*) will be obtained/transferred from the end of study visit of the previous
BAX 855 study. For subjects transitioning from the surgery study (Study 261204), FVIII assays and lipid panel are not part of the end of study 
assessments of the surgery study and must be performed at screening.
c
IR determination for FVIII activity, TGA and pre-infusion VWF only if eligibility confirmed.
d
Including cases of withdrawal or discontinuation.
e
FVIII tests are: 1-stage clotting FVIII activity, FVIII chromogenic activity, and FVIII antigen. Samples will be taken within 30 minutes before and
30 ± 15 minutes after infusion of 60 ± 5 IU/kg of BAX 855.
f
Immunogenicity assays are: inhibitory antibodies to FVIII, binding antibodies to FVIII, BAX 855 and PEG, anti-CHO antibodies. For binding 
antibodies, both IgG and IgM antibodies will be measured. 
Continued on Next Page

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Continued
g
Hematology includes: hemoglobin, hematocrit, red blood cell count, white blood cell count with differential (ie, basophils, eosinophils, lymphocytes, 
monocytes, and neutrophils), mean corpuscular volume (MCV), mean corpuscular hemoglobin concentration (MCHC), platelet count.
h
CD4 count to be tested every 6 months in subjects who are HIV positive.
i
Clinical chemistry includes:  Sodium, potassium, chloride, bicarbonate, total protein, albumin, ALT, AST, total bilirubin, alkaline phosphatase, 
BUN, creatinine, and glucose.
j
Lipid panel includes: cholesterol, VLDL, LDL, HDL, and triglycerides.
k
Viral serology includes: HIV-1Ab, HIV-2 Ab, HBcAb, HBsAb, HBsAg, and HCVAb. Any HIV or HCV positive sample will be tested by PCR for 
viral titer.

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20.4.2 BAX 855 Naïve Subjects on Fixed Dose Prophylactic Treatment Regimen
Assessmentsa
Screening Visitb
ED1 (Baseline)
Follow-Up Visits
End of Study Visitc
6 ± 1 Week 
Following Baseline
Every 3 Months 
± 2 Weeks
Following Baselined
FVIII testsd
P
FVIII pre-infusion
P
P
P
P
FVIII post-infusion
P
P
P
P
TGA pre-infusion 
(optional)
P
P
P
P
TGA post-infusion 
(optional)
P
P
P
P
VWF antigen (pre-
infusion) (optional)
P
P
P
P
Immunogenicity assayse
P
P
P
P
P
Hematologyf
W
W
W
W
CD4 count
W
Wg
Blood typeh
W
Genetics and HLA-
genotype
P
Clinical chemistryi
S
S
S
S
Lipid panelj
S
S
S
S
Viral serologyk
S
Abbreviations:  W = whole blood; P = plasma; S = serum.
a
At all visits subjects must not be actively bleeding and a washout period of at least 84 to preferably 96 hours following the previous dose of BAX 
855 or at least 72 hours following the previous dose of another FVIII concentrate should be observed for blood sampling. All laboratory tests will be 
performed at a central laboratory.
b
Laboratory assessments are to be completed within 45 days prior to the first infusion of BAX 855.
c
Including cases of withdrawal or discontinuation.
d
FVIII tests are: 1-stage clotting FVIII activity, FVIII chromogenic activity, and FVIII antigen. Samples will be taken within 30 minutes before and 
30 ± 15 minutes after infusion of 60 ± 5 IU/kg of BAX 855.
Continued on Next Page

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Continued
e
Immunogenicity assays are: inhibitory antibodies to FVIII, binding antibodies to FVIII, BAX 855 and PEG, anti-CHO antibodies. For binding 
antibodies, both IgG and IgM antibodies will be measured.
f
Hematology includes: hemoglobin, hematocrit, red blood cell count, white blood cell count with differential (ie, basophils, eosinophils, lymphocytes, 
monocytes, and neutrophils), mean corpuscular volume (MCV), mean corpuscular hemoglobin concentration (MCHC), platelet count.
g
CD4 count to be tested every 6 months in subjects who are HIV positive.
h
If historical data on blood group type is available, this may be recorded in the eCRF and blood type does not need to be measured.
i
Clinical chemistry includes: Sodium, potassium, chloride, bicarbonate, total protein, albumin, ALT, AST, total bilirubin, alkaline phosphatase, BUN, 
creatinine, and glucose.
j
Lipid panel includes: cholesterol, VLDL, LDL, HDL, and triglycerides.
k
Viral serology includes: HIV-1Ab, HIV-2 Ab, HBcAb, HBsAb, HBsAg, and HCVAb. Any positive viral antibody test will be repeated using a new 
blood sample in case the positivity is not part of the medical history. Any HIV or HCV positive sample will be tested by PCR for viral titer.

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20.4.3 Subjects on PK-Tailored Prophylactic Treatment Regimen (Transitioning and BAX 855 Naïve Subjects)
Assessmentsa
Screening 
Visitb,c
PK 
Assessmentd
Baseline/
Start of 
Prophylaxis 
6 ± 1 Weekse
Follow-Up Visits
End of Study 
Visitg
4 ± 1, 8 ± 1, 
18 ± 2 Weeks 
Following 
Baselinef
Every 
3 Months ± 2 Weeks 
Following Baseline
FVIII testsh
P (N)
FVIII pre-infusion
P (T*)
P
P
P
P
P
FVIII post-infusion
P (T*)
P
P
P
P
TGA pre-infusioni
P
P
P
P
P
TGA post-infusioni
P
P
P
P
VWF antigen (pre-infusion)i
P
P
P
P
P
Immunogenicity assaysj
P (T* / N)
P (N)
P
P
P
Hematologyk
W (T* / N)
W
W
W
CD4 count
W
Wl
Blood typem
W (N)
Genetics and HLA-genotype
P (N)
Clinical chemistryn
S (T* / N)
S
S
S
Lipid panelo
S (T* / N)
S
S
S
Viral serologyp
S
Abbreviations:  W = whole blood; P = plasma; S = serum. T = transitioning subjects (* denotes that data are transcribed from end of study visit of the 
previous BAX 855 study for transitioning subjects. However, for subjects transitioning from the surgery study (Study 261204), FVIII assays and 
lipid panel are not part of the end of study assessments of the previous BAX 855 study and must be performed at screening); N = BAX855 naïve
subjects.
a
At all visits subjects must not be actively bleeding and a washout period of at least 84 to preferably 96 hours following the previous dose of BAX 
855 or at least 72 hours following the previous dose of another FVIII concentrate should be observed for blood sampling. All laboratory tests will be 
performed at a central laboratory.
b
Laboratory assessments are to be completed within 45 days prior to the first infusion of BAX 855 for BAX855 naïve subjects.
c
For subjects transitioning from the pivotal study (Study 261201), there is an optional assessment of IR at screening (in some BAX 855 studies, IR is 
assessed at the end of study visit and the results can be transcribed).
Continued on Next Page

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Continued
d
PK assessment does not need to be performed in transitioning subjects who have already undergone a PK assessment in a previous BAX 855 study. 
For these subjects the baseline/start of prophylaxis visit will be the first visit after screening and eligibility will be confirmed at this visit. PK 
assessment for subjects aged ≥ 12 years: Pre- and post-infusion blood draws over a period of 96 hours following the infusion of 60 ± 5 IU/kg of BAX 
855 within 30 minutes before infusion and 0.25, 3, 9, 32, 56, and 96 hours post-infusion; PK assessment for subjects aged < 12 years: Pre- and post-
infusion blood draws over a period of 56 hours following the infusion of 60 ± 5 IU/kg of BAX 855 within 30 minutes before infusion and 0.25, 9, 
and 56 hours post-infusion.
e
Baseline/start of PK-tailored prophylaxis starts 6 ± 1 weeks following either PK determination in case the patient has not undergone a PK assessment 
in a previous BAX855 study, or 6 ± 1 weeks following screening if a PK assessment is already available (this visit will then coincide with 
confirmation of eligibility).
f
Only FVIII trough levels and TGA parameters (subjects ≥ 12 years) prior to the next prophylactic infusions are to be performed to determine whether 
the subjects remains at FVIII trough levels of a minimum of 3%.
g
Including cases of withdrawal or discontinuation.
h
FVIII tests are: 1-stage clotting FVIII activity, FVIII chromogenic activity, and FVIII antigen. Samples will be taken within 30 minutes before and 
30 ± 15 minutes after infusion of 60 ± 5 IU/kg of BAX 855.
i
The assessment of TGA parameters and determination of pre-infusion VWF antigen level are optional in subjects aged < 12 years.
j
Immunogenicity assays are: inhibitory antibodies to FVIII, binding antibodies to FVIII, BAX 855 and PEG, anti-CHO antibodies. For binding 
antibodies, both IgG and IgM antibodies will be measured.
k
Hematology includes: hemoglobin, hematocrit, red blood cell count, white blood cell count with differential (ie, basophils, eosinophils, lymphocytes, 
monocytes, and neutrophils), mean corpuscular volume (MCV), mean corpuscular hemoglobin concentration (MCHC), platelet count.
l
CD4 count to be tested every 6 months in subjects who are HIV positive.
m
If historical data on blood group type is available for BAX 855 naïve subjects, this may be recorded in the eCRF and blood type does not need to be 
measured.
n
Clinical chemistry includes: Sodium, potassium, chloride, bicarbonate, total protein, albumin, ALT, AST, total bilirubin, alkaline phosphatase, BUN, 
creatinine, and glucose.
o
Lipid panel includes: cholesterol, VLDL, LDL, HDL, and triglycerides.
p
Viral serology includes: HIV-1Ab, HIV-2 Ab, HBcAb, HBsAb, HBsAg, and HCVAb. For BAX 855 naïve subjects, any positive viral antibody test 
will be repeated using a new blood sample in case the positivity is not part of the medical history. Any HCV positive sample will be tested by PCR 
for viral titer.

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20.5 Karnofsky and Lansky Scores
Karnofsky and Lansky Scores for Performance Status
Karnofsky Score 
(Subjects Aged ≥ 16 Years)
Lansky Score
(Subjects Aged < 16 Years)
Score
Definition
Definition
100
Normal, no complaints; no evidence of 
disease
Fully active, normal
90
Able to perform normal activity; minor signs 
or symptoms of disease
Minor restriction in physically strenuous play
80
Able to perform normal activity with effort; 
some signs or symptoms of disease
Active, but tires more quickly
70
Cares for self, unable to perform normal 
activity or to do active work
Both greater restrictions of, and less time spent in 
active play
60
Requires occasional assistance but is able to 
care for most of own needs
Up and around, but minimal active play; keeps 
busy with quieter activities
50
Requires considerable assistance and 
frequent medical care
Gets dressed, but lies around much of the day; no 
active play; able to participate in all quiet play and 
activities
40
Disabled; requires special care and 
assistance
Mostly in bed; participates in quiet activities
30
Severely disabled; hospitalization indicated, 
although death not imminent
In bed; needs assistance even for quiet play
20
Very sick; hospitalization necessary; active 
supportive treatment required
Often sleeping; play entirely limited to very 
passive activities
10
Moribund; Fatal processes progressing 
rapidly
No play; does not get out of bed
0
Dead
Unresponsive
Source: Karnofsky et al.15 and Lansky et al.16

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21. REFERENCES
1. National Hemophilia Foundation. Recommendation concerning prophylaxis 
(Regular administration of clotting factor concentrate to prevent bleeding). National 
Hemophilia Foundation (NHF) 4/11/2007. Report number: MASAC 179. (Link to 
Publisher's Site: 
http://www.hemophilia.org/NHFWeb/Resource/StaticPages/menu0/menu5/menu57/
masac179.pdf.
2. National Hemophilia Foundation. Recommendation Concerning Prophylaxis 
(Regular Administration of Clotting Factor Concentrate to Prevent Bleeding).
National Hemophilia Foundation (NHF) 4/22/2006. Report number: MASAC 170. 
Link to Publisher's Site: 
http://www.hemophilia.org/NHFWeb/Resource/StaticPages/menu0/menu5/menu57/
170.pdf.
3. Björkman S, Berntorp E. Pharmacokinetics of coagulation factors: clinical 
relevance for patients with haemophilia. Clin.Pharmacokinet. 2001;40: 815-832.
4. Björkman S, Folkesson A, Jönsson S. Pharmacokinetics and dose requirements of 
factor VIII over the age range 3-74 years : A population analysis based on 50 
patients with long-term prophylactic treatment for haemophilia A. 
Eur.J.Clin.Pharmacol. 2009;65: 989-998.
5. Valentino LA, Mamonov V, Hellmann A et al. A randomized comparison of two 
prophylaxis regimens and a paired comparison of on-demand and prophylaxis 
treatments in hemophilia A management. J.Thromb.Haemost. 2012;10: 359-367.
6. Committee for Medicinal Products for Human Use. Guideline on the clinical 
investigation of recombinant and human plasma-derived factor VIII products.
European Agency for the Evaluation of Medicinal Products (EMEA) 2009. Report 
number: EMEA/CHMP/BPWP/144533/2009. Link to Publisher's Site: 
http://www.ema.europa.eu/docs/en_GB/document_library/Scientific_guideline/200
9/09/WC500003614.pdf.
7. National Hemophilia Foundation. Recommendation concerning prophylaxis 
(Prophylactic administration of clotting factor concentrate to prevent bleeding).
National Hemophilia Foundation (NSF) 5/19/2001. Report number: MASC 117. 
Link to Publisher's Site: 
http://www.hemophilia.org/NHFWeb/MainPgs/MainNHF.aspx?menuid=57&conte
ntid=296.

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8. Collins PW, Blanchette VS, Fischer K et al. Break-through bleeding in relation to 
predicted factor VIII levels in patients receiving prophylactic treatment for severe 
haemophilia A. J.Thromb.Haemost. 2009;7: 413-420.
9. Ahnström J, Berntorp E, Lindvall K et al. A 6-year follow-up of dosing, coagulation 
factor levels and bleedings in relation to joint status in the prophylactic treatment of 
haemophilia. Haemophilia. 2004;10: 689-697.
10. den Uijl IEM, Mauser Bunchoten EP, Roosendaal G et al. Clinical severity of 
haemophilia A: does the classification of the 1950s still stand? Haemophilia. 
2011;17: 849-853.
11. Den Uijl I, Biesma D, Grobbee D et al. Outcome in moderate haemophilia. Blood 
Transfus. 2012doi: 10.2450/2012.0091-12. Link to Publisher's Site: 
http://www.bloodtransfusion.it/scarica.aspx?tipo=P&id=000366.
12. Committee for Medicinal Products for Human Use. Guideline on core SmPC for 
human plasma derived and recombinant coagulation factor VIII products. European 
Medicines Agency (EMEA - EMA) 5/24/2012. Report number: 
EMEA/CHMP/BMWP/1619/1999 rev.1. Link to Publisher's Site: 
http://www.ema.europa.eu/docs/en_GB/document_library/Scientific_guideline/201
2/06/WC500128995.pdf.
13. White GC, II, Rosendaal F, Aledort LM et al. Definitions in hemophilia. 
Recommendation of the scientific subcommittee on factor VIII and factor IX of the 
scientific and standardization committee of the International Society on Thrombosis 
and Haemostasis. Thromb.Haemost. 2001;85: 560-575.
14. Boggio LN, Kessler CM. Hemophilia A and B. In: Kitchens C, Alving BM, Kessler 
CM, eds. Consultative Hemostasis and Thrombosis.: Elsevier Saunders; 2007: 45-
59. 
15. Karnofsky DA, Abelmann WH, Craver LF et al. The use of nitrogen mustards in the 
palliative treatment of carcinoma. With particular reference to bronchogenic 
carcinoma. Cancer. 1948;1: 634-656.
16. Lansky SB, List MA, Lansky LL et al. The measurement of performance in 
childhood cancer patients. Cancer. 1987;60: 1651-1656.

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22. SUMMARY OF CHANGES 
Protocol 261302: Amendment 4 2014 MAY 23
Replaces: Amendment 3: 2014 MAR 21
Amendment 1: 2013 OCT 02 (Global)
In this section, changes from the previous version of the Amendment 1, dated 
2013 OCT 02, are described and their rationale is given.
1.
Throughout the document
Description of Change: The protocol has been aligned with the content and 
format of the protocol template revision (dated 2013 SEP 13). At the same time, 
redundant text has been removed and the description of detailed study 
procedures currently in the body of the text has been shifted to the supplement 
section, where each study visit is now described in detail. Minor grammatical 
and/or administrative changes have been made. 
Purpose for Change: To comply with the sponsor’s internal processes/procedures
and improve the readability and/or clarity of the protocol. 
2. Synopsis, Section 8.3 Duration of Study Period(s) and Subject Participation, 
Section 8.2 Overall Study Design, Section 10.7 Subject 
Completion/Discontinuation
Description of Change: a) Study primary completion date and study completion 
date changed from 2016 DEC to Q4 2017, and duration increased by 12 months, 
from 36 months to 4 years.
b) The estimated duration of subject participation to reach 100 EDs was changed 
from ‘6 to 36 months’ to ‘3 to 12 months’. Clarification added that this was 
dependent upon the subject’s exposure history. Beyond 100 EDs, subjects may 
be granted an extension.
c) The following paragraph was deleted from Section 10.7: ‘Subjects have the 
option to exit the study once they have completed 100 EDs with BAX 855. 
Subjects can continue for an additional 50 EDs, or until the sponsor deems the 
BAX 855 study complete.’
Purpose for Change: a) To take the prolonged recruitment period for a total of 
200 evaluable PTPs into consideration. 
b + c) To further define the duration of the subject’s participation in the study.

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3.
Synopsis, Section 7.3.1 Secondary Objectives, Efficacy 
Description of Change: The following secondary efficacy objectives have been 
changed as follows:
a) Instead of the rate of success of BAX 855 treatment in the treatment of 
breakthrough bleeding episodes, an overall hemostatic efficacy rating will be 
used. 
b) The length of intervals between bleeding episodes is now listed as a separate 
objective (was previously combined with the number of infusions used to treat a 
bleeding episode).
c) The more general term Patient Reported Outcomes is now used instead of 
Health Related Quality of Life.
Purpose for Change: a) The overall hemostatic efficacy rating also takes the 
more complex bleeding episodes, such as severe traumatic bleeds with prolonged 
symptoms due to the injury into account as compared to the success rate. 
b) The length of intervals was inadvertently added to the objective regarding 
characterization of efficacy of BAX 855 for treatment of bleeding episodes. 
c) To cover not only the HRQoL. 
4.
Synopsis, Section 7.4 Exploratory Objectives, Section 8.4.3 Exploratory 
Outcome Measure, Section 12.7.5 TGA Testing, Section 19.2 Flow Diagram 
of Study Procedures , Section 19.4 Clinical Laboratory Assessments
Description of Change: An additional exploratory objective was added: “To 
determine the potential correlation between thrombin generation assay (TGA) 
parameters, FVIII trough levels and ABR.” A corresponding exploratory 
outcome measure of TGA parameters, FVIII trough levels and ABR was added.
Purpose for Change: To explore 1) the correlation of a global assay with an ABR 
and FVIII activity levels, 2) which TGA parameter may best correlate with an 
ABR. 
5.
Synopsis, Section 6.3 Population to be Studied, Section 8.1 Brief Summary
Section 8.2 Overall Study Design, Section 8.7.3 and subsections Description 
of Treatment, Section 19.1 Study Flow Chart, Section 19.2 Flow Diagram of 
Study Procedures, Section 19.3 Schedule of Study Procedures and 
Assessments, Section 19.4 Clinical Laboratory Assessments
Description of Change: The following changes were made to the study design:
a) Number of groups/arms/cohorts changed from a single cohort to two (one 
group on a fixed dose regimen and the other on a PK-tailored regimen).

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b) It was clarified that only BAX 855 would be used for the control of bleeding 
episodes. 
c) The reference to male PTPs was removed (ie, females can now be included). 
d) Previously, subjects were to continue with their previous regimen; this has 
been changed to a choice of either a fixed dose prophylaxis with BAX 855 
consisting of 45 ± 5 IU/kg for subjects aged ≥ 12 years or 50 ± 10 IU/kg for 
subjects aged < 12 years twice weekly or, a pharmacokinetically-tailored (PK-
tailored), twice weekly prophylactic regimen based on the subject’s individual 
PK to maintain FVIII trough levels of ≥3%. Visits have been adjusted 
accordingly (see item 35).
Purpose for Change: a + d) To allow the option for an individualized treatment 
regimen based on subject‘s individual PK. 
b) To emphasize that only BAX 855 should be used for the treatment of bleeding 
episodes. 
c) To also allow female hemophilic subjects, although very rare, to participate in 
the study. 
6.
Synopsis, Section 8.4.2 Secondary Outcome Measures, Section 11.2 Overall 
Hemostatic Efficacy Rating of BAX 855 for the Treatment of Bleeding 
Episodes
Description of Change: The following changes were made with respect to 
secondary outcome measures:
a) Instead of the rate of success of BAX 855 treatment in the treatment of 
breakthrough bleeding episodes, an overall hemostatic efficacy rating will be 
used. In Section 11.2, additional details are provided to ensure consistent and 
accurate evaluation of the overall hemostatic efficacy rating endpoint (for 
example, ensuring consistency in diary entries between number of infusions 
administered and the rating given).
b) For the PROs, the changes from baseline will be assessed using the parent 
study as the baseline, if applicable.
Purpose for Change: a) see item 3a. 
b) To clarify the parent study serves as baseline, if applicable.

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7.
Synopsis, Section 8.7.3 Description of Treatment, Section 19.1 Study Flow 
Chart, Section 19.2 Flow Diagram of Study Procedures, Section 19.3 
Schedule of Study Procedures and Assessments
Description of Change: The dose and dosage frequency of BAX 855 has been 
completely revised. It is no longer based on the subject’s previous regimen and 
sABR, with subsequent defined adjustments. Subjects now choose between 
either a fixed dose prophylactic or a PK-tailored regimen. There are 2 fixed 
regimens based on the subject’s age (≥12 years or < 12 years). In all cases, a 
maximum dose of 80 IU/kg for any single infusion is defined. 
Purpose for Change: To base the dosing regimen only on either (1) a fixed dose 
treatment regimen which has been calculated so that the majority of subjects 
remains above a FVIII trough level of 1% for most of the time or (2) an 
individualized PK-tailored dosing regimen targeting FVIII trough levels of at 
least 3%. 
8.
Synopsis, Section 9.1 Inclusion Criteria
Description of Change: The following changes/additions were made to the 
inclusion criteria:
a) Inclusion criteria split according to whether subject is transitioning from 
another BAX 855 study or is BAX 855 naïve (new Sections 9.1.1 and 9.1.2, 
respectively).
b) Informed consent requirement is no longer listed as an inclusion criterion, as 
this must be obtained before any other procedures are carried out.
c) Change in the age limit to ≤ 75 years at screening of previous BAX 855 study 
for transitioning subjects.
d) Outline that Karnofsky performance score applies to subjects aged ≥16 years 
and Lansky score to subjects aged < 16 years.
e) Criteria added regarding negative urine pregnancy test and adequate 
contraception if subject is a female of childbearing potential.
f) Statement added that enrolment of BAX 855 naïve subjects can only start once 
the study sites have been notified by the sponsor .
g) If the FVIII activity is ≥1% at screening in BAX 855 naïve subjects, but the 
subject has historically activity of <1% documented by a certified laboratory or 
the subject has a documented genotype known to result in severe hemophilia A, 
the subject may be included.
h) BAX 855 naïve subjects < 6 years old need to have ≥ 50 EDs to plasma-
derived FVIII documented (≥150 EDs remains as inclusion criteria for older 
subjects).

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Purpose for Change: a) To provide more clarity in describing the eligibility 
criteria for transitioning and BAX 855 naïve subjects. 
b) To comply with the sponsor’s internal processes/procedures. 
c) To remove the lower age limit of 0 years since PTPs are by definition older. 
d) To provide more clarity on the performance scores used. 
e) Change related to item 5c. 
f) To ensure that enrolment of parent study, ie BAX 855 pivotal and BAX 855 
pediatric studies, are complete. 
g) To avoid a long wash-out period in order to reach baseline FVIII trough levels 
with the risk of bleeding episodes in patients receiving prophylactic treatment. 
h) To describe the inclusion criterion in terms of FVIII previous treatment 
history in pediatric PTPs < 6 years of age.
9.
Synopsis, Section 9.2 Exclusion Criteria
Description of Change: The following changes/additions were made to the 
exclusion criteria:
a) Exclusion criteria split according to whether subject is transitioning from 
another BAX 855 study or is BAX 855 naïve (new Sections 9.2.1 and 9.2.2, 
respectively).
b) Cut-off for detectable FVIII inhibitory antibodies increased to ≥ 0.6 BU from 
≥0.4 BU.
c) New criterion added (was included in the German protocol amendment 3), 
‘Subject experienced a life-threatening or gastrointestinal bleeding episode 
within 3 months prior to study entry’.
Purpose for Change: a) see item 8a. 
b) To be aligned with other BAX 855 studies and to avoid the risk of false 
positive results at this low level given the assay variability. 
c) To comply with a regulatory request from Germany.
10. Synopsis, Section 13.1 Sample Size and Power Calculations 
Description of Change: Description that sample size is only based on EMA 
guidance; reference to sample size calculations of contributing BAX 855 studies 
now deleted.
Purpose for Change: To clarify that the sample size is based on EMA guidance. 

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11. Synopsis, Section 13.4 Methods of Analysis (and Subsections)
Description of Change: The following changes were made to the statistical 
analysis methods:
a) Sentence deleted: ‘Only the inhibitory antibodies developed after the first 
exposure to BAX 855 will be included in the analysis’.
b) The analysis of rate of success was replaced with a description of the analysis 
of the overall hemostatic efficacy rating. 
c) Section on analysis of pharmacokinetics (Section 13.4.3) was added
d) The definitions of meaningful improvements in PROs (eg, 11 points in 
Haemo-SYM) were deleted, and the number and proportion of subjects with any 
improvement will be tabulated.
e) Details added on analysis of PedsQL in subjects < 14 years old and 
exploratory outcome measures (patient satisfaction with treatment, patient 
activity level and health resource use data). 
f) Analysis of TGA parameters added.
g) Details of interim safety review changed so that first interim review will be 
performed for the license submission to the EMA and the second may be 
performed once 200 subjects have accumulated at least 100 EDs.
Purpose for Change: a) To take into consideration that BAX 855 is the only IP in 
the study. 
b) see item 3a. 
c) To describe the pharmacokinetics analysis to be performed in this study. 
d) To delete a detailed specification of what is considered a meaningful 
improvement. 
e) To describe that pediatric subjects are included with their age specific PRO 
questionnaires. 
f) To describe the analysis for the additional exploratory endpoint for TGA 
parameters. 
g) To specify that interim safety reviews may be performed for regulatory 
purposes.
12. Section 6.1 Description of Investigational Product
Description of Change: Updated to reflect current status of ongoing studies with 
BAX 855, and to reflect changes made to treatment regimens (background on 
dosing every 5 or 7 days removed; details on FVIII trough level research added). 
Overview table of clinical development program added.
Purpose for Change: Clinical development ongoing.

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13. Section 6.3 Population to be Studied 
Description of Change: ‘Children < 12 years of age will not be enrolled in this 
continuation study until enrollment in the BAX 855 pediatric PTP study has been 
completed’ changed to ‘BAX 855 naïve subjects <12 years of age will not be 
enrolled in this continuation study until enrollment in the BAX 855 pediatric 
PTP study in children aged <12 years (Study 261202) has been completed’. 
Purpose for Change: To emphasize that recruitment for pivotal study for subjects 
≥ 12 years of age and for pediatric study for subjects < 12 years must first be 
completed. 
14. Section 6.5 Evaluation of Anticipated Risks and Benefits of the 
Investigational Product(s) to Human Subjects
Description of Change: Section expanded to provide more detail of anticipated 
risks and benefits.
Purpose for Change: To be in line with other BAX 855 protocols.
15. Section 8.2 Overall Study Design, Section 8.7.3.5 Treatment of Bleeding 
Episodes
Description of Change: Rescue therapy will no longer be used in this study. 
References to ADVATE deleted.
Purpose for Change: To ensure that only BAX855 is used for prophylaxis and 
treatment of bleeding episodes. To minimize the risk that subjects mix up two 
IPs. 
16. Section 8.2 Overall Study Design, Section 19.1 Study Flow Chart, Section 
19.2 Flow Diagram of Study Procedures, Section 19.3 Schedule of Study 
Procedures and Assessments, Section 19.4 Clinical Laboratory Assessments
Description of Change: Study visit structure changed as follows:
a) Start of prophylaxis visit has been deleted. At the start of the study, subjects 
transitioning to a fixed dose regimen will have screening visit only; BAX 855 
naïve subjects will have a screening visit and ED1 (baseline) visit; subjects on a 
PK-tailored regimen will have a screening visit, PK assessment (if not done 
previously) and then a Baseline/Start of prophylaxis visit.
b) For transitioning subjects on a fixed dose regimen the visit structure remains 
the same; eligibility will be confirmed at 6 weeks and IR will be determined at 
the 3-monthly study visits.

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c) BAX 855 naïve subjects with confirmed eligibility will undergo their baseline 
visit for determination of IR at exposure day 1 (ED1) and return to the study site 
after 6 weeks and every 3 months following their baseline visit for IR 
determination.
d) For subjects on a PK-tailored regimen, a PK assessment will be performed 
following eligibility confirmation, followed by a baseline visit and subsequent 
visits every 3 months for IR determination. In addition, at 4, 8 and 18 weeks,
subjects’ FVIII levels, TGA parameters and VWF antigen will be measured to 
ensure that FVIII trough levels of ≥3% are maintained, and, if necessary, dose 
adjustments will be made.
For all subjects, the end of study visit is no longer 28 d ± 2 weeks after the last 
dose.
Purpose for Change: a-d) To provide clear instructions on the revised study 
design. 
17. Section 8.2 Overall Study Design, Section 19.2 Flow Diagram of Study 
Procedures, Section 19.4 Clinical Laboratory Assessments
Description of Change: Determination of IR has been added to the protocol 
Purpose for Change: To allow the measurement of IR over time to detect the 
potential presence of subclinical inhibitors which is also in compliance with the 
EMA/CHMP/BPWP/144533/2009 guideline.
18. Section 9.3 Withdrawal and Discontinuation, Section 10.6 Subject 
Completion/Discontinuation, Section 12.1.1.1 Serious Adverse Event
Description of Change: a) Females may now be enrolled in the study. Specific 
references to male subjects deleted. 
b) Pregnancy added as reason for withdrawal. 
c) Definition of SAEs relating to pregnancy included.
Purpose for Change: a-c) To incorporate additional changes related to item 5c.
19. Section 10.3.1 Subjects Transitioning from Other BAX 855 Studies, Section 
19.2 Flow Diagram of Study Procedures, Section 19.3 Schedule of Study 
Procedures and Assessments, Section 19.4 Clinical Laboratory Assessments
Description of Change: Visit windows have been adjusted. The 6-week visit now 
has a window of ± 1 week (instead of -1 or +2) and the 3-month visit now has a 
window of ± 2 weeks (instead of ± 4 weeks).
Purpose for Change: To ensure closer adherence to the actual visit dates.

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20. Section 8.7.2 Administration 
Description of Change: Instructions added regarding vial potencies, rounding and 
lots for PK assessment and determination of IR, and for prophylaxis and 
treatment of bleeding episodes.
Purpose for Change: Details added due to changes in treatment regimens.
21. Section 8.7.3.2 BAX 855 Dose and/or Frequency Adjustments for Subjects 
on Fixed Dose Prophylactic Treatment Regimen, Section 8.7.3.4 BAX 855 
Dose and/or Frequency Adjustments for Subjects on PK-Tailored 
Prophylactic Treatment Regimen
Description of Change: a) It is no longer necessary to obtain approval fromthe 
sponsor’s medical director to make dose adjustments, but the sponsor should be 
notified if the criteria are met and dose adjustments are made.
b) The following text has been added: ‘Additionally, subjects with severe 
hemophilic arthropathy and/or target joints who continue to experience recurrent 
bleeding episodes despite adjustments to the prophylactic dose and/or dosing 
frequency, an ultrasound of the affected joint(s) should be performed to verify 
the presence of a bleed.’ (Also added to Section 8.7.3.5 Treatment of Bleeding 
Episodes.)
Purpose for Change: a) To ensure a timely adjustment of dosing as clinically 
needed. 
b) To ensure that the presence of a bleed is confirmed. 
22. Section 8.7.3.5 Treatment of Bleeding Episodes 
Description of Change: a) Details on efficacy rating (including table showing the 
scale) moved to Section 11.2 (Overall Hemostatic Efficacy Rating of BAX 855 
for the Treatment of Bleeding Episodes). 
b) Emphasis added that it is critical that treatment of a bleed is initiated as soon 
as possible after the occurrence of the bleeding episode.
c) It was clarified that the infusion for maintenance of hemostasis has to be 
administered within 24 hours of the most recent infusion, otherwise it is 
considered a prophylactic infusion.
d) Required FVIII level (%) added to table of treatment guidelines for bleeding 
episodes and formulae provided for calculation of the required units.
e) Guidance added for treatment of life-threatening bleeds (doses of 80 (±5) 
IU/kg may be considered). 
f) It is no longer necessary to withdraw subjects with life-threatening or 
gastrointestinal bleeding from the study.

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Purpose for Change: a-f) To provide additional guidance in the treatment of 
bleeding episodes.
23. Section 8.7.4 Treatment for Surgery or Dental Procedures
Description of Change: It is now possible for subjects to undergo minor surgical 
or dental interventions if the surgery study is not in place at the study site and the 
intervention can be managed by one prophylactic infusion and an additional 
infusion to maintain hemostasis. If major emergency surgery is required, the 
subject must be withdrawn. Subjects returning to the continuation study post-
surgery will receive their previous continuation study regimen once their 
eligibility is reconfirmed. Dosing in the transition phases between studies is 
clarified.
Purpose for Change: To align with the surgery study protocol and to allow a 
minor interventional procedure to be performed in a timely manner. 
24. Section 10.4 Medications and Non-Drug Therapies
Description of Change: The following text was added: ‘The use of any FVIII 
concentrate other than BAX 855 during the course of the study following the 
first BAX 855 infusion will result in the immediate withdrawal of the subject. 
Every effort should be made to have the Completion/Termination Visit 
performed. The use of (commercial) ADVATE may be permitted for a short 
period of time for administrative reasons.’
Purpose for Change: To ensure that no other FVIII concentrate is used during the 
course of the study with the exception of occasional use of ADVATE for 
administrative reasons, eg delayed arrival of BAX855 at study site. 
25. Section 10.5.2 Patient Reported Outcomes, Section 19.2 Flow Diagram of 
Study Procedures, Section 19.3 Schedule of Study Procedures and 
Assessments
Description of Change: PROs will be assessed every 6 months during the study, 
in addition to baseline and end of study visits.
Purpose for Change: To allow a more frequent assessment of PROs.
26. Section 12.7.1 Hematology, and Clinical Chemistry and Lipid Panel, Section 
19.4 Clinical Laboratory Assessments
Description of Change: CD4 will now be assessed every 6 months during the 
study, in subjects who are HIV positive.
Purpose for Change: To more closely monitor the CD4 status of HIV+ subjects.

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27. Section 12.8.3 Gene Mutations and Human Leukocyte Antigen (HLA) 
Genotype, Section 19.2 Flow Diagram of Study Procedures, Section 19.4 
Clinical Laboratory Assessments
Description of Change: New section added to describe testing for FVIII gene 
mutations in BAX 855 naïve subjects.
Purpose for Change: To confirm the severity of hemophilia A.
28. Section 12.8.4 Factor VIII Activity, FVIII and VWF Antigen, Section 19.2 
Flow Diagram of Study Procedures, Section 19.4 Clinical Laboratory 
Assessments
Description of Change: VWF antigen will be measured pre-infusion at the post-
screening visits.
Purpose for Change: To determine the influence of VWF antigen level on FVIII 
activity levels.
29. Section 12.8.4.1 Pharmacokinetic Evaluation for PK-Tailored Dosing, 
Section 19.2 Flow Diagram of Study Procedures, Section 19.4 Clinical 
Laboratory Assessments
Description of Change: New section added to describe PK assessment in subjects 
who will receive a PK-tailored dosing and who have not undergone a PK 
assessment in a previous BAX 855 study or who are BAX 855 naïve.
Purpose for Change: Section has been added as a result of the additional PK 
tailored dosing regimen. 
30. Section 12.8.4.2 Determination of FVIII Trough Levels, Section 12.8.4.3 
Determination of Incremental Recovery, Section 19.2 Flow Diagram of 
Study Procedures, Section 19.4 Clinical Laboratory Assessments
Description of Change: New sections added.
Purpose for Change: To clarify procedures for FVIII trough levels and IR
determinations.
31. Section 12.8.6 Immunogenicity Assays
Description of Change: Description has been added that washout of at least 84 to 
preferably 96 hours is necessary following the last BAX 855 infusion and that 
subject should not be bleeding. 
Purpose for Change: To ensure the adequate determination of binding antibodies. 

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32. Section 12.8.9 Biobanking
Description of Change: No backup samples will be taken for subjects aged < 6 
years; only backup samples for inhibitory antibodies to FVIII and citrated plasma 
will be taken for subjects aged ≥ 6 and < 12 years.
Purpose for Change: To clarify when back-up samples are to be taken depending 
on subject’s age and local regulations.
33. Section 13.2.4 Analysis Cohorts
Description of Change: Description on analysis per overall subject group as well 
as separate analyses per subgroup of subjects on fixed dose and PK-tailored 
treatment regimen. 
Purpose for Change: This section has been added to outline that analyses will 
also be done for the two different subgroups: fixed dose vs. PK-tailored 
treatment groups.
34. Section 16.4 Data Monitoring Committee
Description of Change: Explanation added as to why the study does not require a 
Data Monitoring Committee (related AEs are anticipated to be similar to those 
seen with ADVATE and also similar to the safety profile observed in the pivotal 
and pediatric studies).
Purpose for Change: To comply with the sponsor’s internal 
processes/procedures.

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35. Section 19 Supplements, Section 19.1 Study Flow Chart, Section 19.2 Flow 
Diagram of Study Procedures, Section 19.3 Schedule of Study Procedures 
and Assessments, Section 19.4 Clinical Laboratory Assessments
Description of Change: a) Study flow chart and flow diagram added, split by 
subjects on fixed dose regimen and subjects on PK-tailored regimen. 
b) Schedules of Study Procedures and Assessments and Schedules of Clinical 
Laboratory Assessments split into:
- Subjects transitioning from other BAX 855 studies on fixed dose prophylactic 
regimen (19.3.1 and 19.4.1, respectively)
- BAX 855 naïve subjects on fixed dose prophylactic treatment regimen (19.3.2 
and 19.4.2, respectively)
- Subjects on PK-tailored prophylactic treatment regimen (transitioning and BAX 
855 naïve subjects) (19.3.3 and 19.4.3, respectively)
c) Laboratory assessments no longer listed out by individual parameters in the 
schedule (for example, all clinical chemistry tests shown under one row ‘clinical 
chemistry’ with parameters detailed in a footnote).
Purpose for Change: a-c) To describe clinical and laboratory schedules for the 
revised study design.

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INVESTIGATOR ACKNOWLEDGEMENT
PRODUCT: BAX 855
STUDY TITLE: A Phase 3b Continuation study of the Safety and Efficacy of 
PEGylated Recombinant Factor VIII (PEG-rFVIII; BAX 855) in Prophylaxis of 
Bleeding in Previously Treated Patients with Severe Hemophilia A
PROTOCOL IDENTIFIER: 261302
CLINICAL TRIAL PHASE 3b
AMENDMENT 4: 2014 MAY 23 (GLOBAL)
Replaces: AMENDMENT 3: 2014 MAR 21 (GERMANY)
AMENDMENT 1: 2013 OCT 02 (GLOBAL)
ALL VERSIONS: 
AMENDMENT 3: 2014 MAR 21 (GERMANY)
AMENDMENT 2: 2013 OCT 22 (RUSSIA)
AMENDMENT 1: 2013 OCT 02 (GLOBAL)
Original: 2013 JUN 18 (GLOBAL)
OTHER ID(s)
NCT Number: NCT01945593
EudraCT Number: NCT01945593
IND NUMBER: 15299
By signing below, the investigator acknowledges that he/she has read and understands 
this protocol, and will comply with the requirements for obtaining informed consent from 
all study subjects prior to initiating any protocol-specific procedures, obtaining written 
initial and ongoing EC(s) protocol review and approval, understands and abides by the 
requirements for maintenance of source documentation, and provides assurance that this 
study will be conducted according to all requirements as defined in this protocol, clinical 
study agreement, ICH GCP guidelines, and all applicable regulatory requirements.
Signature of Principal Investigator
Date
Print Name of Principal Investigator

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INVESTIGATOR ACKNOWLEDGEMENT
PRODUCT: BAX 855
STUDY TITLE: A Phase 3b Continuation study of the Safety and Efficacy of 
PEGylated Recombinant Factor VIII (PEG-rFVIII; BAX 855) in Prophylaxis of 
Bleeding in Previously Treated Patients with Severe Hemophilia A
PROTOCOL IDENTIFIER: 261302
CLINICAL TRIAL PHASE 3b
AMENDMENT 4: 2014 MAY 23 (GLOBAL)
Replaces: AMENDMENT 3: 2014 MAR 21 (GERMANY)
AMENDMENT 1: 2013 OCT 02 (GLOBAL)
ALL VERSIONS: 
AMENDMENT 3: 2014 MAR 21 (GERMANY)
AMENDMENT 2: 2013 OCT 22 (RUSSIA)
AMENDMENT 1: 2013 OCT 02 (GLOBAL)
Original: 2013 JUN 18 (GLOBAL)
OTHER ID(s)
NCT Number: NCT01945593
EudraCT Number: NCT01945593
IND NUMBER: 15299
By signing below, the investigator acknowledges that he/she has read and understands 
this protocol, and provides assurance that this study will be conducted according to all 
requirements as defined in this protocol, clinical study agreement, ICH GCP guidelines, 
and all applicable regulatory requirements.
Signature of Coordinating Investigator
Date
Print Name and Title of Coordinating Investigator
Signature of Sponsor Representative
Date
Barbara Valenta-Singer, MD
 Clinical Development
PPD