Clinical trial NCT04607980
Conditions: Plaque Psoriasis
Keywords: Psoriasis Biosimilar Psoriasis area and severity index
Sponsor: Amgen
Start date: 2020-11-11; Completion date: 2022-06-03
Enrollment: 563 participants; Allocation: RANDOMIZED; Intervention model: PARALLEL

Brief summary:
The purpose of the study is to evaluate the efficacy, safety, and immunogenicity of ABP 654 compared with ustekinumab in participants with moderate to severe plaque psoriasis.

Detailed description:
This is a multicenter study and will enroll approximately 542 participants.

The total duration of study participation for each participant will be 56 weeks, with up to 4 weeks for screening, and for 52 weeks after the first administration of either ABP 654 or ustekinumab.

After confirmation of eligibility, all participants will be randomized in a 1:1 ratio into 2 treatment groups (Group A will receive ABP 654, and Group B will receive ustekinumab) stratified by prior biologic use for psoriasis (yes versus \[vs\] no), geographic region, and baseline body weight (BW).

Based on the psoriasis area and severity index (PASI) score (to determine better improvement or partial improvement) at week 28, the participants in the study will proceed as follows:

1. Participants who do not achieve PASI 50 response or better improvement at Week 28 will be considered to have completed the study and will complete end of study procedures (ie, week 52 procedures), and those unable to complete week 28 visit, or did not have a PASI assessment completed, will be discontinued from the study.
2. Participants who achieve PASI 75 response or better improvement will continue on the study and will be re-randomized in a blinded fashion such that participants initially randomized to Group A (ABP 654) will continue to receive ABP 654 and those in Group B (ustekinumab) will re-randomized, to either continue on ustekinumab (Treatment Group B1) or switch to ABP 654 (Treatment Group B2).
3. Participants with PASI 50 response or better but less than PASI 75 response and on the Investigator's decision, participants will continue on the originally assigned treatment with dose intensification and will not be re-randomized. However, participants that do not dose intensify will be re-randomized.

Arms: arm 1: Participants will receive subcutaneous (SC) injection of ABP 654, 45 mg (baseline BW less than equal to \[\<=\] 100 kg) or 90 mg (baseline BW greater than \[\>\] 100 kg) at weeks 0, 4, and 16. Further from week 28 participants will receive ABP 654 (same dose) every 12 weeks (Q12W) at weeks 28 and 40 or may receive dose intensification Q8W at weeks 28, 36, and 44, depending on PASI score. arm 2: Participants will receive SC injection of ustekinumab,45 mg (baseline BW \<= 100 kg) or 90 mg (baseline BW \> 100 kg) at weeks 0, 4, and 16. At week 28, participants will be re-randomized to continue on ustekinumab (Treatment group B1), or to receive ABP 654 (Treatment group B2) on weeks 28 and 40. Depending on PASI score, some participants may not be re-randomized and may receive dose intensification with ustekinumab Q8W at weeks 28, 36, and 44.
Interventions: intervention 1: ABP 654 intervention 2: Ustekinumab
Intervention descriptions: intervention 1: Participants will receive SC injection of ABP 654. intervention 2: Participants will receive SC injection of ustekinumab.

Protocol documents:
Prot_000.pdf: 
Amgen Proprietary - Confidential 
Amgen, Inc 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
1 of 84 
06 Aug 2020 
Title Page 
Protocol Title: 
A Phase 3, Multicenter, Randomized, 
Double-Blind Study Evaluating the Efficacy 
and Safety of ABP 654 Compared with 
Ustekinumab in Subjects With Moderate to 
Severe Plaque Psoriasis 
Short Title: 
A Study to Investigate ABP 654 for the 
Treatment of Subjects with Moderate to 
Severe Plaque Psoriasis 
Test Product: 
ABP 654 
Trade Name: 
Not applicable 
Indication: 
Moderate to Severe Plaque Psoriasis 
Study Sponsor: 
Amgen, Inc. 
One Amgen Center Drive 
Thousand Oaks, CA 91320-1799 USA 
Protocol Number: 
20190232 
Study Phase: 
Phase 3 
Regulatory Agency Identifying 
Numbers: 
IND: 139331 
EudraCT: 2020-003184-25 
Approval Date: 
Final, 06 August 2020 
NCT Number: NCT04607980
This NCT number has been applied to the document
for purposes of posting on Clinicaltrials.gov


Amger Propnetary-Confidential 
Amgcn, Inc 
20190232 
Protocol Signature Page- Sponsor: 
Clinical Study Protocol 
CONFIDENTIAL 
This protocol has been reviewed and approved by the rcpresentativc(s) listed below. Any 
modification of the protocol must be agreed upon by the sponsor and the investigator and must 
be documented in writing. 
Amgcn, Inc reprcscntative(s): 
Print Name 
Signa
 
Title 
Day (DD M
YYY) 
Final
Page 2 of 84
06 Aug 2020


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
3 of 84 
06 Aug 2020 
Protocol Signature Page  Contract Research Organization (CRO) 
This protocol has been reviewed and approved by the representative(s) listed below.  Any 
modification of the protocol must be agreed upon by the sponsor and the investigator and must 
be documented in writing. 
CRO representative(s): 
 
 
Print Name 
 
Title 
 
 
Signature 
 
Date (DD Month YYYY) 
 
Senior Medical Director
10 August 2020


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
4 of 84 
06 Aug 2020 
 
Protocol Signature Page - Investigator 
I have read this protocol, which has been agreed by Amgen, Inc and given approval/favorable 
opinion by the Institutional Review Board (IRB)/Independent Ethics Committee (IEC), and I 
agree that it contains all necessary details for my staff and I to conduct this study as described.  I 
will provide copies of the protocol and any amendments to all study personnel under my 
supervision and provide access to all information provided by Amgen, Inc or their specified 
designees.  I will discuss the material with the study personnel to ensure that they are fully 
informed about the study. 
I understand that information contained in or pertaining to this protocol is confidential and 
should not be disclosed, other than to those directly involved in the execution or the ethical 
review of the study, without written authorization from Amgen, Inc.  It is, however, permissible 
to provide information to a subject in order to obtain consent. 
I agree to conduct this study according to this protocol and to comply with its requirements, 
subject to ethical and safety considerations and guidelines, and to conduct the study in 
accordance with the general guidelines indicated in the Declaration of Helsinki, International 
Council for Harmonisation (ICH) guidelines on Good Clinical Practice (GCP), and applicable 
national or regional regulatory requirements. 
I agree to comply with the procedures described for data recording and reporting and to permit 
monitoring and auditing by Amgen, Inc, and inspection by the appropriate regulatory authorities. 
I agree to make my subjects’ study records available to Amgen, Inc personnel, their 
representatives and relevant regulatory authorities in order to verify data that I have entered into 
the case report forms.  I will retain the study-related essential documents until Amgen, Inc 
indicates that they are no longer needed.  I am aware of my responsibilities as an investigator as 
provided by Amgen, Inc. 
I agree to ensure that Financial Disclosure Statements will be completed by me (including, if 
applicable, my spouse [or legal partner] and dependent children) and my subinvestigators 
(including, if applicable, their spouses [or legal partners] and dependent children) at the start of 
the study and for up to 1 year after the study is completed, if there are changes that affect my 
financial disclosure status. 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
5 of 84 
06 Aug 2020 
 
I understand that Amgen, Inc may decide to suspend or prematurely terminate the study at any 
time for whatever reason; such a decision will be communicated to me in writing.  Conversely, 
should I decide to withdraw from execution of the study, I will communicate my intention 
immediately in writing to Amgen, Inc. 
Investigator: 
 
 
 
 
Print Name 
 
 
Title 
 
Institution 
 
 
 
Signature 
 
Date (DD Month YYYY) 
 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
6 of 84 
06 Aug 2020 
 
Table of Contents 
 
Table of Contents ............................................................................................................................ 6 
1 
Protocol Summary .................................................................................................................. 11 
1.1 
Synopsis .............................................................................................................................. 11 
1.2 
Study Schema ..................................................................................................................... 16 
1.3 
Schedule of Assessments .................................................................................................... 17 
2 
Introduction ............................................................................................................................ 19 
2.1 
Study Rationale .................................................................................................................. 19 
2.2 
Background......................................................................................................................... 19 
2.3 
Benefit/Risk Assessment .................................................................................................... 21 
3 
Objectives and Endpoints ....................................................................................................... 22 
4 
Study Design ........................................................................................................................... 22 
4.1 
Overall Design .................................................................................................................... 22 
4.2 
Scientific Rationale for Study Design ................................................................................ 25 
4.2.1 
Subject Input into Design ............................................................................................... 25 
4.3 
Justification for Dose .......................................................................................................... 25 
4.4 
End of Study Definition...................................................................................................... 25 
5 
Study Population ..................................................................................................................... 26 
5.1 
Inclusion Criteria ................................................................................................................ 26 
5.2 
Exclusion Criteria ............................................................................................................... 27 
5.3 
Subject Enrollment ............................................................................................................. 30 
5.4 
Lifestyle Considerations ..................................................................................................... 31 
5.4.1 
Meals and Dietary Restrictions ...................................................................................... 31 
5.4.2 
Caffeine, Alcohol, and Tobacco ...................................................................................... 31 
5.4.3 
Activity ........................................................................................................................... 31 
5.5 
Screen Failures ................................................................................................................... 31 
5.6 
Premature Discontinuation ................................................................................................. 32 
5.6.1 
Premature Discontinuation of Investigational Product or Procedures ........................... 32 
5.6.2 
Withdrawal/Discontinuation of Subjects from the Study ............................................... 32 
5.6.3 
Dose Delay ..................................................................................................................... 34 
5.6.4 
Lost to Follow-up ........................................................................................................... 34 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
7 of 84 
06 Aug 2020 
 
6 
Treatments .............................................................................................................................. 35 
6.1 
Investigational Product(s) ................................................................................................... 35 
6.1.1 
ABP 654 Dosage Form ................................................................................................... 37 
6.1.2 
Ustekinumab Dosage Form(s) ........................................................................................ 38 
6.1.3 
Preparation, Handling, Storage, and Accountability ...................................................... 38 
6.1.4 
Product Complaints ........................................................................................................ 39 
6.1.5 
Prohibited Treatments ..................................................................................................... 39 
6.2 
Measures to Minimize Bias: Blinding and Randomization ................................................ 40 
6.2.1 
Blinding .......................................................................................................................... 40 
6.2.2 
Randomization ................................................................................................................ 41 
6.3 
Study Intervention Compliance .......................................................................................... 41 
6.4 
Prior and Concomitant Therapy ......................................................................................... 41 
6.5 
Dose Modification .............................................................................................................. 42 
6.5.1 
ABP 654 and Ustekinumab ............................................................................................ 42 
6.6 
Intervention After the End of the Study ............................................................................. 43 
6.7 
Loss of Subjects to Follow-up ............................................................................................ 43 
7 
Study Assessments and Procedures ........................................................................................ 43 
7.1 
Screening and Eligibility Assessments ............................................................................... 44 
7.1.1 
Informed Consent ........................................................................................................... 44 
7.1.2 
Medical History .............................................................................................................. 44 
7.1.3 
Demographics ................................................................................................................. 44 
7.2 
Efficacy Assessments ......................................................................................................... 44 
7.2.1 
Psoriasis Area and Severity Index (PASI) ...................................................................... 44 
7.2.2 
Static Physician Global Assessment (sPGA) .................................................................. 45 
7.2.3 
Body Surface Area (BSA) .............................................................................................. 45 
7.3 
Other Study Assessments ................................................................................................... 45 
7.3.1 
Physical Examinations and Weight/Height .................................................................... 45 
7.3.2 
Vital Signs ...................................................................................................................... 45 
7.3.3 
Tuberculosis Testing ....................................................................................................... 46 
7.3.4 
Chest Radiography ......................................................................................................... 46 
7.4 
Safety Assessments ............................................................................................................. 46 
7.4.1 
Adverse Events and Serious Adverse Events ................................................................. 46 
7.4.2 
Events of Interest ............................................................................................................ 46 
7.4.3 
Anti-Drug Antibodies ..................................................................................................... 46 
7.4.4 
Clinical Safety Laboratory Assessments ........................................................................ 47 
7.4.5 
Pregnancy ....................................................................................................................... 48 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
8 of 84 
06 Aug 2020 
 
7.5 
Adverse Events ................................................................................................................... 49 
7.5.1 
Definitions ...................................................................................................................... 49 
7.5.2 
Assessment of Adverse Events ....................................................................................... 52 
7.5.3 
Documenting and Reporting Adverse Events ................................................................. 53 
7.5.4 
Reporting of Serious Adverse Events ............................................................................. 54 
7.5.5 
Regulatory Reporting Requirements for Serious Adverse Events ................................. 55 
7.5.6 
Reporting of Serious Adverse Event After the Protocol-required Reporting Period ...... 56 
7.5.7 
Method of Detecting Adverse Events and Serious Adverse Events ............................... 56 
7.5.8 
Adverse Event and Serious Adverse Event Follow-up ................................................... 56 
7.6 
Pharmacokinetics ................................................................................................................ 57 
7.7 
Pharmacodynamics ............................................................................................................. 57 
7.8 
Biomarkers ......................................................................................................................... 57 
8 
Statistical Considerations ....................................................................................................... 57 
8.1 
General Considerations ...................................................................................................... 57 
8.2 
Statistical Hypotheses ......................................................................................................... 58 
8.3 
Sample Size Determination ................................................................................................ 58 
8.4 
Populations for Analyses .................................................................................................... 58 
8.5 
Planned Analyses ................................................................................................................ 59 
8.5.1 
Primary Efficacy Endpoint ............................................................................................. 59 
8.5.2 
Secondary Efficacy Endpoints ........................................................................................ 60 
8.5.3 
Safety Endpoints ............................................................................................................. 60 
8.5.4 
Pharmacokinetic Analyses .............................................................................................. 61 
8.5.5 
Demographic and Baseline Characteristics .................................................................... 61 
8.5.6 
Exposure to Investigational Product ............................................................................... 61 
8.5.7 
Exposure to Prior and Concomitant Medications ........................................................... 61 
8.5.8 
Subgroup Analyses and Covariates ................................................................................ 62 
8.5.9 
Interim Analyses ............................................................................................................. 62 
8.5.10 
Handling of Missing Data .............................................................................................. 62 
9 
Supporting Documentation and Operational Considerations ................................................. 62 
9.1 
Appendix 1: Regulatory, Ethical, and Study Oversight Considerations ............................ 62 
9.1.1 
Regulatory and Ethical Considerations .......................................................................... 62 
9.1.2 
Good Clinical Practice .................................................................................................... 63 
9.1.3 
Institutional Review Board ............................................................................................. 63 
9.1.4 
Informed Consent ........................................................................................................... 64 
9.1.5 
Data Monitoring Committee (DMC) .............................................................................. 65 
9.1.6 
Financing and Insurance ................................................................................................. 66 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
9 of 84 
06 Aug 2020 
 
9.1.7 
Data and Records Management ...................................................................................... 67 
9.1.8 
Publication Policy ........................................................................................................... 70 
9.1.9 
Auditing and Monitoring ................................................................................................ 71 
9.1.10 
Data Protection ............................................................................................................... 73 
9.1.11 
Protocol Approval and Amendment ............................................................................... 73 
9.2 
Appendix 2: Contraceptive Guidance and Collection of Pregnancy Information .............. 74 
9.3 
Appendix 3: Static Physician’s Global Assessment (sPGA) Scale .................................... 80 
9.4 
Appendix 4: Abbreviations and Trademarks ...................................................................... 81 
10 References............................................................................................................................... 84 
List of Figures 
Figure 1-1 
Study Schema........................................................................................................ 16 
Figure 4-1 
Week 28 Decision Tree Diagram .......................................................................... 24 
 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
10 of 84 
06 Aug 2020 
 
List of Tables 
Table 1-1 
Schedule of Assessments ...................................................................................... 17 
Table 1-2 
Schedule of Assessments for Dose Intensification Subjects (Q8W) .................... 18 
Table 3-1 
Objectives and Endpoints ..................................................................................... 22 
Table 6-1 
Study Investigation(s) Administered..................................................................... 37 
Table 7-1 
Protocol-Required Safety Laboratory Assessments .............................................. 47 
Table 8-1 
Populations for Analysis ....................................................................................... 59 
 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
11 of 84 
06 Aug 2020 
 
 
1 Protocol Summary 
1.1 Synopsis 
Protocol Title: A Phase 3, Multicenter, Randomized, Double-Blind Study Evaluating the 
Efficacy and Safety of ABP 654 Compared with Ustekinumab in Subjects With Moderate to 
Severe Plaque Psoriasis 
Sponsor Protocol No.: 20190232 
Study Phase: Phase 3 
Test product: ABP 654 
Regulatory agency identifier numbers: IND number 139331 
 
 
 
 
 
       EudraCT number 2020-003184-25 
Sponsor:  Amgen, Inc 
Rationale: 
The current study is designed to investigate the efficacy, safety, and immunogenicity of ABP 654 
compared with ustekinumab in subjects with moderate to severe plaque psoriasis. 
Objectives and Endpoints: 
Objectives 
Endpoints 
Primary: 
To compare the efficacy of ABP 654 with ustekinumab 
in subjects with moderate to severe plaque psoriasis. 
Primary Efficacy Endpoint: 
Psoriasis area severity index (PASI) percent 
improvement from baseline to week 12 
Secondary: 
To assess the safety and immunogenicity of ABP 654 
compared with ustekinumab. 
Secondary Efficacy Endpoints: 
• 
PASI percent improvement at other timepoints 
• 
PASI 75 response throughout the study 
• 
PASI 100 response throughout the study 
• 
Static Physician’s Global Assessment (sPGA) 
responses (0/1) at week 12 and week 52 
• 
Body surface area (BSA) change from baseline 
at week 12 and week 52 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
12 of 84 
06 Aug 2020 
 
Objectives 
Endpoints 
Safety Endpoints: 
• 
Treatment-emergent adverse events (TEAEs) 
and serious adverse events (SAEs) 
• 
Events of interest (EOI) 
• 
Incidence of anti-drug antibodies 
 
Overall Design: 
Design:  This is a randomized, double-blind, active-controlled, multicenter study 
Study Population:  Adult subjects, including men and women between 18 to 75 years of age, with 
moderate to severe plaque psoriasis 
Parallel:  Subjects will be randomized (1:1) to Treatment Group A (ABP 654) or Treatment 
Group B (ustekinumab) 
A Data Monitoring Committee (DMC) will periodically review study data. 
Number of Subjects: 
Approximately 542 adult subjects will be randomized in a 1:1 ratio to receive ABP 654 or 
ustekinumab stratified by prior biologic use for psoriasis (yes vs. no), geographic region, and 
baseline body weight (BW).  Subjects with prior biologic use for psoriasis will be capped at 50% 
of the total randomized subjects.  The sample size will provide greater than 95% power to 
demonstrate equivalence at a significance level of 0.025 on PASI percent improvement from 
baseline at week 12 with an equivalence margin of (-15, +15), assuming a common standard 
deviation of 30.0 (Leonardi, 2008; Papp, 2008) and a true mean difference of 0 with 10% 
drop-out. 
Intervention Groups and Duration: 
The total duration of study participation for each subject will be 56 weeks, with up to 4 weeks 
for screening, and for 52 weeks after the first administration of either ABP 654 or ustekinumab. 
Dose regimens:  ABP 654 (45 mg or 90 mg, subcutaneous [SC] injection) and ustekinumab 
(45 mg or 90 mg, SC injection). 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
13 of 84 
06 Aug 2020 
 
Test Product, Dose, and 
Mode of Administration: 
ABP 654 administered by SC injection using a blinded 
pre-filled syringe (PFS) at a dose of 45 mg (baseline BW ≤ 
100 kg) or 90 mg (baseline BW > 100 kg) at weeks 0, 4, 
and 16.  Subsequent dosing will be done at the same dose 
every 12 weeks (Q12W) for subjects not requiring dose 
intensification (at the Investigator’s discretion) or every 
8 weeks (Q8W) for subjects requiring dose intensification. 
Reference Therapy, Dose, and 
Mode of Administration: 
Ustekinumab administered by SC injection using a blinded 
PFS at a dose of 45 mg (baseline BW ≤ 100 kg) or 90 mg 
(baseline BW > 100 kg) at weeks 0, 4, and 16.  Subsequent 
dosing will be done at the same dose.  Q12W for subjects 
not requiring dose intensification or Q8W for subjects 
requiring dose intensification. 
 
During the approximately 56 weeks of total study participation, each subject will receive a total 
of either 5 or 6 doses, based on the one group to which they are assigned, as described below.  
Subjects will receive an initial 3 doses of either ABP 654 or ustekinumab at weeks 0, 4, and 16.  
From week 28 subjects will receive either ABP 654 or ustekinumab every 8 weeks (Q8W) or 
every 12 weeks (Q12W). 
At week 28, disease assessments will be conducted including the evaluation of PASI. 
Subjects who do not achieve a PASI 50 response or better improvement at week 28 will be 
considered to have completed the study and will complete the end of study procedures (ie, week 
52 procedures) at week 28.  Those unable to complete week 28 visit, or did not have a PASI 
assessment completed, will be discontinued from the study (see Week 28 Decision Tree Diagram 
below). 
Subjects with a PASI 75 response or better improvement will continue on the study and will be 
re-randomized in a blinded fashion such that subjects initially randomized to Group A 
(ABP 654) will continue to receive ABP 654 and those in Group B (ustekinumab) will be 
re-randomized 1:1 to either continue on ustekinumab (Treatment Group B1) or switch to 
ABP 654 (Treatment Group B2).  Subjects will receive investigational product at week 28 and 
the last dose of investigational product at week 40. 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
14 of 84 
06 Aug 2020 
 
For subjects with PASI 50 response or better but less than PASI 75 response at week 28, based 
on the Investigator’s discretion, subjects may increase dose frequency to Q8W.  Subjects with 
baseline BW  100 kg will receive 45 mg Q8W and subjects  100 kg at baseline will receive 
90 mg Q8W at weeks 28, 36, and 44.  These subjects will continue on original assigned 
treatment with dose intensification and will NOT be re-randomized.  Subjects not dose 
intensifying will be re-randomized as described above. 
Week 28 Decision Tree Diagram 
 
Sites and Regions: This study is planned to be conducted globally at sites in North America and 
Europe. 
Rules, procedures, and stopping rules for dose changes and adjustments:  See Sections 6.5 
and 7. 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
15 of 84 
06 Aug 2020 
 
Data Monitoring Committee:  See Section 9.1.5. 
Statistical Analysis 
All efficacy analyses will be conducted in the full analysis set, consisting all randomized 
subjects, according to randomized treatment group.  Sensitivity analyses will be performed for 
the primary and key secondary efficacy endpoints using the per-protocol analysis set. 
Clinical equivalence of the primary endpoint will be evaluated by comparing the 2-sided 95% 
confidence interval (CI) of the mean difference of PASI percent improvement from baseline to 
week 12 between ABP 654 versus ustekinumab with equivalence margin of (-15, +15).  Clinical 
equivalence of the primary endpoint for Japan will be evaluated by comparing the 2-sided 
95% CI of the mean difference of PASI percent improvement from baseline to week 12 between 
ABP 654 versus ustekinumab in subjects with baseline BW ≤ 100 kg (and hence are to receive 
the 45 mg dose) against the (-15, +15) margin. 
The 95% CI of the difference will be estimated using analysis of covariance model with the 
baseline PASI value and stratification factors as covariates.  The mean difference of PASI percent 
improvement between the initial randomized groups (ABP 654 vs ustekinumab) or between the 
re-randomized groups (ABP 654/ABP 654, ustekinumab/ustekinumab, ustekinumab/ABP 654) at 
other scheduled visits, the risk difference of PASI 75 and 100 response rate throughout the study, 
the risk difference of the percent of subjects with sPGA responses (0/1) at week 12 and week 52, 
and the mean difference in BSA change from baseline at week 12 and week 52 will be 
summarized descriptively.  Separate descriptive summaries by initial randomized groups 
(ABP 654 vs ustekinumab) will be provided for post week 28 timepoints in subjects with dose 
intensification. 
Safety endpoints will be summarized descriptively in the Safety Analysis Set, consisting of all 
randomized subjects who received at least 1 dose of investigational product, based on the actual 
treatment received.  In general, summaries will be provided separately from day 1 (first 
investigational product administration) until week 12, from day 1 until week 28, from week 28 
through the end of the study (EOS), and from day 1 through the EOS.  The summaries for day 1 
through week 12 and day 1 through week 28 will be presented by treatment (ABP 654 vs 
ustekinumab).  The summaries for week 28 through the EOS and day 1 through the EOS will be 
presented by treatment sequence (ABP 654/ABP 654, ustekinumab/ustekinumab, 
ustekinumab/ABP 654) for subjects who are re-randomized and treated post re-randomization.  
Safety data from week 28 through the EOS for subjects with dose intensification will be 
summarized separately by treatment (ABP 654 vs ustekinumab).  All reported adverse events 
will be assigned the system organ class and preferred term according to the Medical Dictionary 


Amgen Proprietary - Confidential 
Amgen, Inc  
Clinical Study Protocol 
20190232 
 
CONFIDENTIAL 
Final 
16 of 84 
06 Aug 2020 
 
for Regulatory Activities (MedDRA) dictionary and graded by Common Terminology Criteria 
for Adverse Events (CTCAE; version 4.03).  The number and percent of subjects reporting 
TEAEs, SAEs, and EOIs will be tabulated.  The number and percent of subjects developing anti-
drug antibodies will be tabulated by visit. 
The primary analysis for the study will be performed when all subjects reach week 32 or 
terminate early.  Final analysis will be performed when all subjects reach week 52 or terminate 
early.  An independent DMC will evaluate the safety data throughout the study. 
1.2 Study Schema 
The study schema is provided in Figure 1-1. 
Figure 1-1 
Study Schema 
 
 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
17 of 84 
06 Aug 2020 
1.3 Schedule of Assessments 
The Schedule of Assessments (SoA) is provided in Table 1-1.  The SoA for Dose Intensification Subjects (Q8W) is provided in 
Table 1-2. 
Table 1-1 
Schedule of Assessments 
 
Screening 
Baseline 
Week 
(± 3 days)g 
Week 
 (± 5 days)g 
End of Study d  
(± 5 days) 
Study Visit-Week 
 28 days 
Day 1/ Week 
0 
4  
12  
16  
28  
32  
40  
52 
Informed consent  
X 
  
  
  
  
  
  
  
  
Medical / medication history 
X 
  
  
  
  
  
  
  
  
Physical examination 
X 
X 
  
  
  
  
  
  
X 
Height  
X  
X 
  
  
  
  
  
  
  
Body weight 
X 
X 
X 
 
X 
X 
 
 
X 
Vital signs  
X 
X 
X 
X 
X 
X 
X 
X 
X 
Adverse events 
Xa 
X 
X 
X 
X 
X 
X 
X 
X 
Concomitant medications 
X 
X 
X 
X 
X 
X 
X 
X 
X 
Disease assessments 
  
  
  
  
  
  
  
  
  
PASI / sPGA / BSA 
X 
X 
X 
X 
X 
X  
 
 X 
X 
Laboratory assessments 
  
  
  
  
  
  
  
  
  
Tuberculosis Testing 
X 
  
  
  
  
  
  
  
  
TB Worksheet 
Xb 
  
  
  
  
  
  
  
  
Chest X-ray 
Xc 
  
  
  
  
  
  
  
  
Serum pregnancy test  
X 
  
  
  
  
  
  
  
  
Serology (HBsAg, HCV) 
X 
  
  
  
  
  
  
  
  
Urine pregnancy test 
  
X 
 X 
X 
X 
X 
X 
X 
X 
Hematology 
X 
X 
  
X 
 
X 
X 
X 
X 
Chemistry 
X 
X 
  
X 
 
X 
X 
X 
X 
Urinalysis 
X 
X 
  
X 
 
X 
X 
X 
X 
Pharmacokinetics 
  
X 
X 
X 
 
X 
X 
X 
X 
Anti-drug antibodies  
  
X 
X 
X 
 
X 
X 
X 
X 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
18 of 84 
06 Aug 2020 
Investigational Product 
  
  
  
  
  
  
  
  
  
Randomization 
 
X 
 
 
 
X 
 
 
 
IP Administration e 
  
X 
X 
  
X 
Xf 
  
X 
  
Table 1-2 
Schedule of Assessments for Dose Intensification Subjects (Q8W) 
 
Week 
(± 5 days)g 
 
End of Study d 
(± 5 days) 
Study Visit-Week 
28  
32  
36  
44  
52  
Physical examination 
  
  
 
 
X 
Body weight 
X 
 
 
 
X 
Vital signs  
X 
X 
X 
X 
X 
Adverse events 
X 
X 
X 
X 
X 
Concomitant medications 
X 
X 
X 
X 
X 
Disease assessments 
  
  
 
 
  
PASI / sPGA / BSA 
X  
 
X 
X 
X 
Laboratory assessments 
  
  
 
 
  
Urine pregnancy test 
X 
X 
X 
X 
X 
Hematology  
X 
X 
X 
X 
X 
Chemistry 
X 
X 
X 
X 
X 
Urinalysis 
X 
X 
X 
X 
X 
Pharmacokinetics 
X 
X 
 
 
X 
Anti-drug antibodies  
X 
X 
 
 
X 
Investigational Product 
  
  
 
 
  
IP Administration e 
X 
  
X 
X 
  
BSA = body surface area; HBsAg = hepatitis B surface antigen; HCV = hepatitis C virus antibody; IP = investigational product; PASI = Psoriasis Area and Severity Index; PPD = 
purified protein derivative; sPGA = static Physician’s Global Assessment; TB = tuberculosis. 
aReport SAEs that occur after signing informed consent form.  Non-serious AEs are reported as medical history prior to randomization. 
bOnly for subjects with a positive tuberculosis test (ie, positive PPD or positive or indeterminate Quantiferon®/T-spot® ) 
cPrior radiography or formal reports signed off by a radiologist within 3 months of screening is acceptable. 
dSubjects who missed week 28 visit or terminated early from the study should complete all procedures scheduled for week 52 within 28 days after withdrawal/discontinuation if 
possible.  Subjects not achieving PASI 50 at week 28 will be considered to have completed the study and will complete end of study procedures (ie, week 52 procedures) at week 28. 
eABP 654/ ustekinumab will be administered after all other procedures are completed for each dosing visit. 
fFor subjects requiring dose intensification, refer to separate schedule of assessment above for week 28 to week 52 procedures. 
gDosing should be delayed if subject has a serious infection (up to 3 days for weeks 4 and 12, and up to 5 days for subsequent visits).  Refer to protocol Section 6.5 for details.


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
19 of 84 
06 Aug 2020 
2 Introduction 
ABP 654 is a biosimilar candidate to Stelara® (ustekinumab) which is an interleukin (IL)-12 and 
IL-23 antagonist. 
The term “investigational product” throughout the protocol, refers to ABP 654 or ustekinumab. 
2.1 Study Rationale 
Amgen is developing ABP 654 as a biosimilar candidate to Stelara® (ustekinumab).  ABP 654 
and ustekinumab belong to the pharmacologic class of IL-12 and IL-23 antagonists.  The 
mechanism of action across indications involves the ustekinumab protein molecule binding with 
specificity to the p40 protein subunit used by both the IL-12 and IL-23 cytokines.  This binding 
disrupts IL-12 and IL-23 mediated signaling and cytokine cascades by disrupting the interaction 
of these cytokines with a shared cell-surface receptor chain, IL-12 receptor subunit beta 1 
(IL-12Rβ). 
In the US, ustekinumab is approved for the SC administration in the treatment of moderate to 
severe plaque psoriasis (Ps) in adults and adolescent subjects (12 years or older), and active 
psoriatic arthritis (PsA) in adults, as well as maintenance dosing for adult patients with moderate 
to severe active Crohn’s disease and moderate to severe active ulcerative colitis; ustekinumab is 
also approved for the intravenous (IV) route of administration in the treatment of moderate to 
severe active Crohn’s Disease (CD) in adults and moderate to severe active ulcerative colitis in 
adults (Stelara® United States Prescribing Information [USPI], March 2020).  In the EU, 
ustekinumab is approved for SC administration in the treatment of moderate to severe Ps in 
adults and adolescent subjects (6 years or older) and PsA in adults.  In the EU, ustekinumab is 
approved for the treatment of the above indications with the exception that pediatric patients with 
moderate to severe plaque psoriasis are considered for treatment if 6 years or older (Stelara® 
Summary of Product Characteristics [SmPC], February 2020). 
A biosimilar product, generally, is one that is highly similar to a licensed biologic reference 
product, and there are no clinically meaningful differences between the biosimilar and reference 
products in terms of safety, purity, and potency.  Biosimilarity is demonstrated by the totality of 
the evidence, including quality, nonclinical, and clinical evidence.  The quality and nonclinical 
data for ABP 654 and ustekinumab are summarized in the Investigator’s Brochure. 
2.2 Background 
ABP 654 is designed to have an identical primary amino acid sequence, the same primary 
mechanism of action, and the same biological and functional characteristics as ustekinumab.  


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
20 of 84 
06 Aug 2020 
ABP 654 has the same dosage forms (solution for injection), product strength, and formulation as 
ustekinumab (US and EU). 
The totality of evidence available from an ongoing analytical program suggests that ABP 654 is 
analytically similar to ustekinumab with respect to its physicochemical properties and biological 
activities, except for minor differences expected from cell line changes; these minor differences 
are not expected to be clinically meaningful.  Both ABP 654 and ustekinumab have the same 
amino acid sequence.  ABP 654 and ustekinumab (US and EU) have similar in vitro binding to 
IL-23, IL-12, and neonatal fragment crystallizable receptor (FcRn), similar inhibition of IL-23 
and IL-12, and similar binding kinetics and affinity to IL-23 and IL-12.  Effector functions 
(ADCC and CDC) towards cells expressing IL-12 and/or IL-23 receptors are not expected to 
occur with ABP 654 and ustekinumab.  The lack of ADCC was confirmed when ABP 654 and 
ustekinumab were tested for effector functions using human IL-12 expressing U937 cells.  Lack 
of CDC activity is currently being investigated. 
Refer to the Investigator’s Brochure for more information. 
As of the date of this protocol, ABP 654 has not been tested in humans.  This Study 20190232 is 
being conducted to demonstrate that there is no clinically meaningful difference between 
ABP 654 and ustekinumab in terms of efficacy, safety, and immunogenicity in adult subjects 
with moderate to severe plaque psoriasis.  Based on the analytical similarity of ABP 654 and 
ustekinumab established to date, clinical experience with ustekinumab is deemed relevant to 
predicting the effects of ABP 654 in humans and is summarized in the following paragraphs.  A 
separate study, Study 20190230, is being conducted to evaluate the single dose pharmacokinetics 
(PK), safety, tolerability, and immunogenicity of ABP  654 (90 mg SC injection) compared to 
ustekinumab (US and EU) in healthy subjects. 
Ustekinumab has been investigated in a number of clinical trials and for a number of different 
indications.  In healthy subjects, the median time of maximum concentration (Tmax) value 
following a single SC administration of 90 mg of ustekinumab was comparable to subjects with 
psoriasis.  The maximum observed concentration (Cmax) and area under the concentration-time 
curve (AUC) in healthy subjects was higher than values seen in subjects with psoriasis.  This is 
likely attributed to differing PK sampling schedules between the 2 studies, differences in BW 
between the 2 populations, or increased IL-12/IL-23 binding target concentrations in subjects 
with psoriasis.  In healthy subjects following a single 90 mg SC dose, the apparent volume of 
distribution was 90.2 mL/kg and the terminal half-life (t1/2) was 22.1 days with an apparent 
systemic clearance of 3.1 mL/day/kg (BLA 125261 Clinical Pharmacology and 
Biopharmaceutics Review, 2009). 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
21 of 84 
06 Aug 2020 
In subjects with plaque psoriasis, exposure increased in an approximately dose proportional 
manner after a single SC administration at doses range from 0.27 mg/kg to 2.7 mg/kg.  Serum 
concentrations of ustekinumab were higher in the group receiving the 90 mg dose, as opposed to 
the 45 mg dose.  However, when comparing the difference among the 2 groups dose 
proportionality was also shown.  Assessment of intrinsic factors including BW, age, and sex were 
performed.  When given the same dose of ustekinumab, subjects that weighed > 100 kg had 
lower median serum ustekinumab concentrations compared with those subjects weighing 
 100 kg.  Subgroup analysis showed that age, sex, and race had no effects on clinical response 
(Stelara USPI, March 2020; BLA 125261 Clinical Pharmacology and Biopharmaceutics 
Review, 2009). 
The clinical efficacy and safety information for ustekinumab as described in the product labeling 
for Stelara® (Stelaraâ USPI, March 2020; Stelara® SmPC, February 2020) are considered 
relevant to predicting the effects of ABP 654 in humans.  When ustekinumab was administered 
to subjects with plaque psoriasis in clinical studies, subjects had a reduction in disease as 
measured by PASI score (≥ 75% improvement in PASI [PASI 75]) from baseline to week 12 and 
treatment success (cleared or minimal) on the Physician’s Global Assessment (PGA) as 
compared with the placebo arm.  Adverse events reflected in the warnings and precautions 
section of the product labeling for ustekinumab that may be serious include bacterial, fungal, and 
viral infections including tuberculosis, malignancies, hypersensitivity reactions, reversible 
posterior leukoencephalopathy syndrome, and noninfectious pneumonia. 
2.3 Benefit/Risk Assessment 
ABP 654 is expected to be biosimilar to ustekinumab.  The risks and benefits of ABP 654 are 
therefore expected to be the same as those of ustekinumab, as specified in the product labeling.  
All subjects in this study will receive an active treatment. 
More detailed information about the expected benefits, risks, and reasonably expected adverse 
events of ABP 654 can be found in the Investigator’s Brochure. 
Considering the measures taken to minimize risk to subjects participating in this study, the 
potential risks identified in association with ABP 654 are justified by the anticipated benefits to 
subjects with moderate to severe plaque psoriasis. 
A risk assessment will be performed on an ongoing basis to evaluate the potential impact of 
coronavirus disease 2019 (COVID-19) on subjects.  Risk mitigation measures, including 
COVID-19 related precautions and procedures (including severe acute respiratory syndrome 
coronavirus [SARS-CoV-2] testing/screening) will be implemented based on the prevailing 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
22 of 84 
06 Aug 2020 
situation during study conduct, at the investigator’s discretion and in accordance with local and 
institutional guidelines as applicable. 
3 Objectives and Endpoints 
Objects and endpoints are described in Table 3-1. 
Table 3-1 
Objectives and Endpoints 
Objectives 
Endpoints 
Primary: 
To compare the efficacy of ABP 654 with 
ustekinumab in subjects with moderate to 
severe plaque psoriasis. 
Primary Efficacy Endpoint: 
• 
Psoriasis area severity index (PASI) percent 
improvement from baseline to week 12 
Secondary: 
To assess the safety and immunogenicity of 
ABP 654 compared with ustekinumab. 
Secondary Efficacy Endpoint: 
• 
PASI percent improvement at other timepoints 
• 
PASI 75 response throughout the study 
• 
PASI 100 response throughout the study 
• 
Static Physician’s Global Assessment (sPGA) 
responses (0/1) at week 12 and week 52 
• 
Body surface area (BSA) change from baseline at 
week 12 and week 52 
Safety Endpoints: 
• 
TEAEs and SAEs 
• 
EOIs 
• 
Incidence of anti-drug antibodies 
4 Study Design 
4.1 Overall Design 
This is a randomized, double-blind, active-controlled phase 3 study in adult subjects with 
moderate to severe plaque psoriasis.  This study is planned to be conducted globally at sites in 
North America and Europe. 
Approximately 542 adult subjects will be randomized (approximately 271 in the ABP  654 group 
and approximately 271 in the ustekinumab group).  See Section 8.3 for sample size 
determination.  Randomization will be stratified based on prior biologic use for psoriasis (yes 
versus [vs] no (no more than 50% of the total randomized subjects will have prior biologic use 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
23 of 84 
06 Aug 2020 
for psoriasis), baseline BW (≤ 100 kg vs > 100 kg), and geographic region.  Subjects will be 
randomized (1:1) to Treatment Group A (ABP 654) or Treatment Group B (ustekinumab).  
Subjects will receive ABP 654 or ustekinumab at a dose of 45 mg (baseline BW ≤ 100 kg) or 
90 mg (baseline BW > 100 kg) administered SC on day 1 (week 0), week 4, and week 16.  The 
primary endpoint (PASI percent improvement from baseline to week 12) will be evaluated at 
week 12. 
At week 28, subjects who do not achieve a PASI 50 response or better improvement will be 
considered to have completed the study and will complete end of study procedures (ie, week 52 
procedures), and those unable to complete the week 28 visit, or did not have a PASI assessment 
completed, will be discontinued from the study (see Figure 4-1). 
Subjects with a PASI 75 response or better improvement will continue on the study and will be 
re-randomized in a blinded fashion such that subjects initially randomized to Group A (ABP 654) 
will continue to receive ABP 654 and those in Group B (ustekinumab) will re-randomized, using 
the same stratification factors as the original randomization, 1:1 to either continue on 
ustekinumab (Treatment Group B1) or switch to ABP 654 (Treatment Group B2).  Subjects will 
receive investigational product at week 28 and the last dose of investigational product at 
week 40. 
For subjects with PASI 50 response or better but less than PASI 75 response at week 28, based 
on the Investigator’s discretion, the dose frequency may be increased to Q8W.  Subjects with 
baseline BW ≤ 100 kg will receive 45 mg Q8W and subjects > 100 kg at baseline will receive 
90 mg Q8W at weeks 28, 36, and 44.  These subjects will continue on the originally assigned 
treatment with dose intensification and will not be re-randomized.  Subjects that do not dose 
intensify will be re-randomized. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
24 of 84 
06 Aug 2020 
Figure 4-1 
Week 28 Decision Tree Diagram 
 
Efficacy endpoints will include PASI percent improvement from baseline at week 12, PASI 
percent improvement at other timepoints, PASI 75 and PASI 100 response throughout the study, 
sPGA response (0/1) at week 12 and week 52, and body surface area (BSA) change from 
baseline at week 12 and week 52.  The sPGA scale is described in Section 9.3 (Appendix 3).  
Safety endpoints will include treatment-emergent adverse events (TEAEs), SAEs, EOIs, and 
incidence of anti-drug antibodies.  Blinded data will be monitored on an ongoing basis by the 
clinical study team to ensure subjects’ safety. 
The study design is presented in Figure 1-1 and the SoA is presented in Section 1.3.  The study 
will consist of a screening period (≤ 4 weeks), a 52-week treatment period, and an EOS visit at 
week 52. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
25 of 84 
06 Aug 2020 
The planned duration of the clinical study is approximately 56 weeks for screening, 
randomization, treatment, and completion. 
No interim analyses are planned.  The primary analysis for the study will be performed when all 
subjects reach week 32 or terminate early.  Final analysis will be performed when all subjects 
reach week 52 or terminate early. 
A DMC will meet to review unblinded data to monitor safety based on the DMC Charter at 
specified time intervals throughout the study. 
This study is double-blinded to minimize bias on the part of the subjects, Investigators, and the 
sponsor/contract research organization (CRO). 
4.2 Scientific Rationale for Study Design 
ABP 654 is being developed globally as a biosimilar to the reference product ustekinumab.  
Accordingly, ustekinumab was chosen as the control group.  Analytical similarity has already 
been demonstrated between ABP 654 and ustekinumab as outlined in Section 2.2. 
In the current study, clinical similarity is being evaluated in subjects with moderate to severe 
plaque psoriasis globally. 
4.2.1 
Subject Input into Design 
Not applicable. 
4.3 Justification for Dose 
The dose (45 mg or 90 mg, which is based on baseline BW) is the approved psoriasis dosing 
regimen for ustekinumab (US and EU) for which ABP 654 is being tested for similarity.  See 
Section 6.5 for Dose Modifications. 
4.4 End of Study Definition 
A subject is considered to have completed the study if he/she has completed all phases of the 
study including an EOS visit or the last scheduled procedure shown in the SoA. 
The EOS is defined as the date of the last visit of the last subject in the study or last scheduled 
procedure shown in the SoA for the last subject in the trial globally. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
26 of 84 
06 Aug 2020 
5 Study Population 
The study population will consist of adult subjects including men and women between 18 to 
75 years of age with moderate to severe plaque psoriasis.  Subjects must be able to provide 
written consent and meet all the inclusion criteria and none of the exclusion criteria. 
Prospective approval of protocol deviations to eligibility criteria, also known as protocol waivers 
or exemptions, is not permitted. 
5.1 Inclusion Criteria 
Subjects cannot be randomized before all inclusion criteria (including test results) are confirmed. 
Subjects are eligible to be included in the study only if all of the following criteria apply: 
1. Men and women ≥ 18 years and ≤ 75 years of age at the time of randomization 
2. Stable moderate to severe plaque psoriasis for at least 6 months (eg, no morphology 
changes or significant flares of disease activity in the opinion of the Investigator) 
3. Baseline score of PASI ≥ 12, involvement of ≥ 10% BSA, and sPGA ≥ 3 at screening and 
at baseline 
4. Candidate for phototherapy or systemic therapy 
5. Previous failure, inadequate response, intolerance, or contraindication to at least 
1 conventional anti-psoriatic systemic therapy (eg, methotrexate, cyclosporine, psoralen 
plus ultra-violet light [PUVA]) 
6. For women (except those at least 2 years postmenopausal or surgically sterile):  a 
negative serum pregnancy test during screening and a negative urine pregnancy test at 
baseline 
7. Signed Institutional Review Board/Ethics Committee (IRB/IEC)-approved informed 
consent and able to complete study procedures 
8. No known history of latent or active TB.  Subject must meet any 1 of the following 
3 criteria: 
• Subject has a negative test for tuberculosis during screening, defined as either: 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
27 of 84 
06 Aug 2020 
o Negative purified protein derivative (PPD; < 5 mm of induration at 48 to 72 hours 
after test is placed) OR 
o Negative Quantiferon®/T-spot test 
• Subjects with a positive PPD and a history of Bacillus Calmette-Guérin vaccination 
are allowed with a negative Quantiferon®/T-spot® 
• Subjects with a positive PPD test (without a history of Bacillus Calmette-Guérin 
[BCG] vaccination) or subjects with a positive or indeterminate Quantiferon®/T-spot 
test are allowed if they have all of the following: 
o No symptoms per tuberculosis worksheet provided by the sponsor, Amgen 
o Documented history of adequate prophylaxis initiation prior to receiving 
investigational product in accordance with local recommendations 
o No known exposure to a case of active TB after most recent prophylaxis 
o No evidence of active TB on chest radiograph within 3 months prior to the first 
dose of investigational product 
5.2 Exclusion Criteria 
Subjects are excluded from the study if any of the following criteria apply: 
Skin disease related conditions 
1. Erythrodermic psoriasis (PsO), pustular PsO, guttate PsO, medication induced PsO, or 
other skin conditions at the time of the screening visit (eg, eczema) that would interfere 
with evaluations of the effect of investigational product on PsO 
Other medical conditions 
2. Subject has a planned surgical intervention during the duration of the study 
3. Subject has an active infection or history of infections as follows: 
a. Any active infection for which systemic anti-infectives were used within 28 days 
prior to randomization 
b. A serious infection, defined as requiring hospitalization or intravenous anti-
infectives within 8 weeks prior to randomization 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
28 of 84 
06 Aug 2020 
c. Recurrent or chronic infections or other active infection that, in the opinion of the 
Investigator, might cause this study to be detrimental to the subject 
4. Known history of human immunodeficiency virus (HIV) 
5. Hepatitis B surface antigen (HbsAg) or HCV antibody positivity at screening 
6. Uncontrolled, clinically significant systemic disease such as uncontrolled diabetes 
mellitus, cardiovascular disease, renal disease, liver disease, or hypertension 
7. Known malignancy within the previous 5 years (except treated and considered cured 
cutaneous squamous or basal cell carcinoma, in situ cervical cancer, OR in situ breast 
ductal carcinoma) 
8. Active neurological disease such as multiple sclerosis, Guillain-Barre syndrome, optic 
neuritis, transverse myelitis or history of neurologic symptoms suggestive of central 
nervous system demyelinating disease 
9. Moderate to severe heart failure (New York Heart Associate [NYHA] class III/IV) 
10. Known hypersensitivity to the investigational product or to any of the excipients 
11. Any concurrent medical condition that, in the opinion of the Investigator, could cause this 
study to be detrimental to the subject 
Laboratory abnormalities 
12. Laboratory abnormalities at screening, including any of the following: 
a. Hemoglobin < 9 g/dL 
b. Platelet count < 100,000/mm3 
c. White blood cell count (WBC) < 3,000 cells/mm3 
d. Aspartate aminotransferase (AST) and/or alanine aminotransferase (ALT) ≥ 2.0 × 
the upper limit of normal (ULN) 
e. Creatinine clearance < 50 mL/min (Cockcroft-Gault formula) 
f. Any other laboratory abnormality, which, in the opinion of the Investigator, will 
prevent the subject from completing the study or will interfere with the 
interpretation of the study results 
Washouts and non-permitted drugs 
13. Previous treatment with any agent specifically targeting IL-12 or IL-23 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
29 of 84 
06 Aug 2020 
14. Received biologic treatment for psoriasis within the previous month or 5 drug half-lives 
(whichever is the longer) prior to randomization 
15. Received any investigational agents within the previous month or 5 drug half-lives 
(whichever is the longer) prior to randomization 
16. Received non-biologic systemic psoriasis therapy within 4 weeks prior to randomization 
(including but not limited to oral retinoids, methotrexate, cyclosporine, systemically 
administered calcineurin inhibitors, azathioprine, thioguanine, hydroxyurea, fumarates, 
mycophenolate mofetil, Janus kinase (JAK) inhibitors, or oral or parenteral corticosteroids 
including intramuscular or intraarticular administration [exception: ophthalmic, otic, 
nasal, or inhaled corticosteroids within recommended doses is permitted]) 
17. Received Ultra-violet A (UVA) phototherapy (with or without psoralen) or excimer laser 
within 4 weeks prior to randomization, or ultra-violet B (UVB) phototherapy within 
2 weeks prior to randomization 
18. Received topical psoriasis treatment within 2 weeks prior to randomization (exception: 
upper mid-strength to least potent [class III to VII] topical steroids permitted on the palms, 
soles, face, and intertriginous areas; bland emollients [without urea or  or hydroxy 
acids]) 
19. Received live viral or live bacterial vaccination within 2 weeks prior to randomization 
20. Received BCG vaccination within 1 year prior to randomization 
21. Other investigational procedures within 4 weeks prior to randomization and during the 
study 
General 
22. Active substance abuse within 24 weeks prior to randomization 
23. For women: pregnant or breast feeding, or planning to become pregnant while 
participating in the study and for at least 15 weeks after the last dose of investigational 
product 
24. Sexually active subjects and their partners who are of childbearing potential (ie, neither 
surgically nor postmenopausal) and not agreeing to use adequate contraception (eg, true 
abstinence, sterilization, birth control pills, Depo-Provera injections, or contraceptive 
implants) while on study and for 5 months after the last dose of investigational product.  
Male subjects must agree not to donate sperm during the study and for 5 months following 
the treatment with test article or until the scheduled EOS (whichever is longer) 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
30 of 84 
06 Aug 2020 
25. Subject likely not to be available to complete all protocol-required study visits or 
procedures, and/or to comply with all required study procedures (eg, Clinical Outcome 
Assessments) to the best of the subject and Investigator’s knowledge 
26. Any physical or psychiatric disorder that, in the opinion of the Investigator, may 
compromise the ability of the subject to give informed consent and/or to comply with all 
required study procedures 
5.3 Subject Enrollment 
Before subjects begin participation in any study-specific activities/procedures, Amgen requires a 
copy of the site’s written IRB/IEC approval of the protocol, informed consent form (ICF), and all 
other subject information and/or recruitment material. 
The subject must personally sign and date the IRB/IEC and Amgen approved ICF before 
commencement of study-specific procedures. 
A subject is considered enrolled when the Investigator decides that the subject has met all 
eligibility criteria and has been randomized in the Interactive Web/Voice Response System 
(IXRS).  The Investigator is to document this eligibility decision and date in the subject’s 
medical record. 
Each subject will have a unique subject identification number obtained from the IXRS.  This will 
be assigned at the screening visit.  The unique 11-digit subject identification will be assigned in 
sequential order for each site in the format “232XXXXX###,” where “232XXXXX” refers to the 
site number and “###” refers to the sequential subject ordering as each subject at a site is entered 
into the IXRS (eg, 23212345001).  This number will be used to identify the subject throughout 
the clinical study and must be used on all study documentation related to that subject.  The 
Investigator will keep a record (the subject screening log) that includes limited information (such 
as date of screening) about the potential candidates for subjects who entered screening. 
If a subject withdraws from study participation, his/her unique identification number(s) cannot 
be re-used for another subject. 
The subject identification number must remain constant throughout the entire clinical study; it 
must not be changed after initial assignment, including if a subject is rescreened.  This number 
will not necessarily be the same as the randomization number assigned for the study. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
31 of 84 
06 Aug 2020 
5.4 Lifestyle Considerations 
COVID-19 Considerations 
Sites and subjects will follow local and institutional guidelines as applicable for prevention of 
COVID-19 infection.  In the event that a subject experiences any signs/symptoms of COVID-19, 
the subject should promptly notify the Investigator.   
5.4.1 
Meals and Dietary Restrictions 
Not applicable. 
5.4.2 
Caffeine, Alcohol, and Tobacco 
Not applicable. 
5.4.3 
Activity 
Not applicable. 
5.5 Screen Failures 
Screen failures are defined as subjects who consent to participate in the clinical study but are not 
subsequently randomly assigned to study intervention.  A minimal set of screen failure 
information is required to ensure transparent reporting of screen failure subjects to meet the 
Consolidated Standards of Reporting Trials (CONSORT) publishing requirements and to 
respond to queries from regulatory authorities.  Minimal information includes demography, 
reason for screen failure (eg, eligibility requirements failed), and any SAEs. 
If a subject has not met all eligibility criteria at the end of the screening period, the subject will 
be registered as a screen fail.  Individuals who do not meet the criteria for participation in this 
study (screen failure) may be rescreened.  Rescreened subjects should be assigned the same 
subject identification number as for the initial screening.  Laboratory assessments used to 
determine subject eligibility may be repeated during the screening period before the subject is 
considered a screen failure.  Screen failed subjects may be rescreened up to 2 times at the 
Investigator’s discretion (ie, a total of 3 screens including initial screening).  If screening 
procedures cannot be completed within 28 days before day 1, the subject will be considered a 
screen failure but may be eligible for rescreening.  These subjects can be rescreened under the 
same ICF if rescreening and randomization occurs within 30 days of initial consent date.  If it is 
longer than 30 days from the initial consent, the subject will need to be re-consented and all 
screening procedures need to be repeated. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
32 of 84 
06 Aug 2020 
5.6 Premature Discontinuation 
Subjects have the right to withdraw from treatment with investigational product, protocol 
procedures, or the study completely at any time and for any reason without prejudice to their 
future medical care by the physician or at the institution. 
5.6.1 
Premature Discontinuation of Investigational Product or Procedures 
Subjects (or a legally acceptable representative) can decline to continue receiving investigational 
product or procedures at any time during the study but continue participation in the study.  If this 
occurs, the Investigator is to discuss with the subject the appropriate processes for 
discontinuation from investigational product and must discuss with the subject the possibilities 
for continuation of the SoA (Section 1.3) including different options of follow-up (eg, in person, 
by phone/mail, through family/friends, in correspondence/communication with other treating 
physicians, from the review of medical records) and collection of data, including AEs, and must 
document this decision in the subject’s medical records.  Subjects who have discontinued 
investigational product and/or other protocol-required therapies or procedures should not be 
automatically removed from the study.  Whenever safe and feasible, it is recommended that these 
subjects remain on study to ensure safety surveillance and/or collection of efficacy data, where 
possible.  Reasons for early removal from protocol-required investigational product(s) or 
procedural assessments may include: 
• Decision by sponsor 
• Lost to follow-up 
• Death 
• Adverse event 
• Subject request 
• Protocol deviation 
• Noncompliance 
• Pregnancy 
5.6.2 
Withdrawal/Discontinuation of Subjects from the Study 
Participation in the study is strictly voluntary.  Subjects have the right to withdraw from the 
study by his/her own request at any time and for any reason without any reprisal, and without 
prejudice to future medical care by the physician or institution. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
33 of 84 
06 Aug 2020 
Subjects who are unable to complete week 28 visit will not be re-randomized, will be 
discontinued from the study, and will be asked to return to complete an EOS visit within 28 days 
from determining that the subject will discontinue from the study. 
Subjects not achieving PASI 50 at week 28 will be considered to have completed the study and 
will complete end of study procedures (ie, week 52 procedures) at week 28. 
Subjects terminating early from the study should complete all procedures scheduled for week 52 
within 28 days after withdrawal/discontinuation if possible. 
Withdrawal of consent for a study means that the subject does not wish to receive further 
protocol-required therapies or procedures, and the subject does not wish to or is unable to 
continue further study participation.  Subject data up to withdrawal of consent will be included in 
the analysis of the study, and where permitted, publicly available data can be included after 
withdrawal of consent.  The Investigator is to discuss with the subject appropriate procedures for 
withdrawal from the study, and must document the subject’s decision to withdraw in the 
subject’s medical records.  If the subject withdraws consent for disclosure of future information, 
the sponsor may retain and continue to use any data collected before such a withdrawal of 
consent.  If a subject withdraws from the study, he/she may request destruction of any samples 
taken and not tested, and the Investigator must document this in the study center study records 
and notify the sponsor or designee.  Although a subject is not obliged to give his/her reason(s) 
for withdrawing prematurely from a study, the Investigator should make a reasonable effort to 
ascertain the reason(s), while fully respecting the subject's rights.  Subjects who are withdrawn 
will not be replaced.  Subjects who prematurely discontinue from the study cannot subsequently 
rejoin the study. 
A subject may be discontinued from the study at any time at the discretion of the Investigator for 
safety, behavioral, or administrative reasons, including, but not limited to: 
• Requirement for alternative therapy or alternative dosing schedule per the Investigator’s 
determination 
• The subject develops a malignancy. (Exception: Subjects may be allowed to continue if 
they develop no more than 2 non-melanoma skin cancers during the study) 
• AEs or SAEs 
• Any laboratory abnormalities that in the judgment of the Investigator, taking into 
consideration the subject’s overall status, prevents the subject from continuing 
participation in the study 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
34 of 84 
06 Aug 2020 
• Any other reason relating to the subject's safety or integrity of the study data 
• Noncompliance with study procedures 
• Withdrawal of consent from the study 
• Lost to follow-up 
• Decision by sponsor/investigator 
• Death 
Refer to the SoA (Section 1.3) for data to be collected at the time of study discontinuation and 
evaluations that need to be completed. 
If a subject withdraws or is discontinued from the study, the Clinical Research Associate (CRA) 
will be informed immediately. 
5.6.2.1 
Premature Discontinuation of the Study 
If the study is prematurely terminated or suspended, the sponsor shall promptly inform the 
Investigators, the IRBs/IECs, the regulatory authorities, and any CRO(s) used in the study of the 
reason for termination or suspension, as specified by the applicable regulatory requirements.  
The Investigator shall promptly inform the subjects and should assure appropriate subject 
therapy and/or follow-up. 
5.6.3 
Dose Delay 
Dose delay may be considered if the subject meets one of the specified conditions in Section 6.5. 
5.6.4 
Lost to Follow-up 
A subject will be considered lost to follow-up if he/she repeatedly fails to return for scheduled 
visits and is unable to be contacted by the study center. 
The following actions must be taken if a subject fails to return to the clinic for a required study 
visit: 
• The study center must attempt to contact the subject and reschedule the missed visit as 
soon as possible, counsel the subject on the importance of maintaining the assigned visit 
schedule, and ascertain whether or not the subject wishes to and/or should continue in the 
study 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
35 of 84 
06 Aug 2020 
• Before a subject is deemed lost to follow-up, the Investigator (or designee) must make 
every effort to regain contact with the subject (where possible, 3 telephone calls and, if 
necessary, a certified letter to the subject’s last known mailing address or local equivalent 
methods).  These contact attempts should be documented in the subject notes 
• Should the subject continue to be unreachable, he/she will be considered to have 
withdrawn from the study with a primary reason of lost to follow-up 
6 Treatments 
6.1 Investigational Product(s) 
The Investigator must ensure that the investigational product will be used only in accordance 
with the protocol.  Study treatments and investigational products are described below and in 
Table 6-1. 
Subjects will be initially randomly assigned to 1 of 2 treatment groups to receive a dose of either 
ABP 654 or ustekinumab, as follows: 
• Treatment Group A:  ABP 654, SC injection, 45 mg (baseline BW ≤ 100 kg) or 
90 mg (baseline BW > 100 kg) at weeks 0, 4, and 16 
• Treatment Group B:  Ustekinumab, SC injection, 45 mg (baseline BW ≤ 100 kg) or 
90 mg (baseline BW > 100 kg) at weeks 0, 4, and 16 
At week 28, subjects with a PASI 50 response or better may then be subsequently re-randomized 
to receive either ustekinumab (SC, Q12W) or ABP 654 (SC, Q12W), as follows: 
• Treatment Group A (ABP 654):  Will continue to receive ABP 654 Q12W at weeks 28 
and 40 
• Treatment Group B (ustekinumab): Will be re-randomized 1:1 to either continue on 
ustekinumab Q12W at weeks 28 and 40 (Treatment Group B1) or switch to ABP 654 
Q12W at weeks 28 and 40 (Treatment Group B2) 
At the Investigator’s discretion, subjects from Group A and Group B who achieve PASI 50 
response or better, but do not achieve PASI 75 response or better may receive dose 
intensification Q8W at weeks 28, 36, and 44.  These subjects will remain on their original 
treatment and will not be re-randomized.  
In all treatment groups, doses will be administered SC with doses administered based on baseline 
BW (45 mg for baseline BW ≤ 100 kg or 90 mg for baseline BW > 100 kg). 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
36 of 84 
06 Aug 2020 
Investigational product will be administered by authorized, licensed healthcare professionals.  
The investigation product will be administered using SC injection according to standard practice.  
It is recommended that each injection be administered at a different anatomic location (such as 
upper arms, gluteal regions, thighs, or any quadrant of abdomen) than the previous injection, and 
not into areas where the skin is tender, bruised, erythematous, or indurated. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
37 of 84 
06 Aug 2020 
Table 6-1 
Study Investigation(s) Administered 
Group Name: 
ABP 654 
Ustekinumab 
Type: 
Biologica 
Biologica 
Dosage Formulation: 
Liquid suspension 
Liquid suspension 
Unit Dose Strength(s): 
45 mg/0.5 mL solution in a single 
dose prefilled syringe for subjects 
with baseline BW ≤ 100 kg 
90 mg/mL solution in a single dose 
prefilled syringe for subjects with 
baseline BW > 100 kg 
45 mg/0.5 mL solution in a single dose 
prefilled syringe for subjects with baseline 
BW ≤ 100 kg 
90 mg/mL solution in a single dose prefilled 
syringe for subjects with baseline BW > 100 
kg 
Dosage Level(s): 
Dose based on baseline BW: 
• 
45 mg (≤ 100 kg) 
• 
90 mg (> 100 kg) 
Dose based on baseline BW: 
• 
45 mg (≤ 100 kg) 
• 
90 mg (> 100 kg) 
Route of Administration: 
SC injection 
SC injection 
Sourcing: 
Provided centrally by the sponsor 
Provided centrally by the sponsor  
Packaging and Labeling: 
Study Intervention will be provided in 
a PFS.  Each PFS will be labeled as 
required per country requirement.  
Study Intervention will be provided in a PFS.  
Each PFS will be labeled as required per 
country requirement. 
BW = body weight; PFS = pre-filled syringe; Q8W = every 8 weeks; Q12W = every 12 weeks; SC = subcutaneous. 
a recombinant fully human IgG1 monoclonal antibody produced by recombinant DNA technology. 
 
6.1.1 
ABP 654 Dosage Form 
ABP 654 is a recombinant fully human IgG monoclonal antibody produced by recombinant 
DNA technology and is produced in a glyco-engineered Chinese hamster ovary cell line.  
ABP 654 is purified by processes that include specific viral inactivation and filtration steps.  
ABP 654 and ustekinumab have the same amino acid sequence. 
ABP 654 is supplied as a sterile, single dose, preservative-free solution for SC injection and is 
supplied in a prefilled syringe (PFS) containing 45 mg/0.5 mL ABP 654 or 90 mg/mL ABP 654.  
The PFS is a 27-gauge fixed ½ inch needle and is fitted with a passive needle guard and a needle 
cover that contains dry natural rubber (a derivative of latex). 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
38 of 84 
06 Aug 2020 
Each 0.5 mL PFS delivers 45 mg ABP 654, L-histidine and L-histidine monohydrochloride 
monohydrate, polysorbate 80, and sucrose.  Each 1 mL PFS delivers 90 mg ABP 654, L-histidine 
and L-histidine monohydrochloride monohydrate, polysorbate 80, and sucrose.  See the 
Investigator’s Brochure for additional details. 
6.1.2 
Ustekinumab Dosage Form(s) 
Ustekinumab is a recombinant fully human IgG monoclonal antibody produced by recombinant 
DNA technology, and is produced by an Sp2/0 cell line. 
Ustekinumab is supplied in 45 mg/0.5 mL and 90 mg/mL single use PFS of Stelara®. 
Each single-use PFS delivers 45 mg or 90 mg ustekinumab, L-histidine, L-histidine 
monohydrochloride monohydrate, polysorbate 80, and sucrose. 
6.1.3 
Preparation, Handling, Storage, and Accountability 
Study medication should be stored protected from light and according to the storage and 
expiration information provided on the label (where required) that is affixed to the package 
containing the investigational product.  The PFS should be stored in a secured refrigerator (2° to 
8°C) and monitored (manual or automated) in accordance with the labeled storage conditions and 
country-specific regulations, with access limited to the Investigator and authorized site staff.  
Study medication should not be frozen.  The Investigator or designee must maintain 
documentation to confirm appropriate temperature conditions have been maintained during 
transit and storage at site for all study medication received and any discrepancies are reported 
and resolved before use of the study medication. 
The PFS should be checked for cracks or damage that may occur during transport.  Damaged 
product should not be administered and should be returned to Amgen or its designee. 
Detailed information regarding the labeling, packaging, storage, preparation, and administration 
of each investigational product are to be provided separately in the Pharmacy Manual. 
All supplies of study medication will be accounted for in accordance with GCP guidelines.  
There will be an individual investigational product accountability record for each subject and the 
Investigator, Pharmacist, or designee, should maintain accurate records of the disposition of all 
study medication supplies received during the study.  These records should include the amounts 
and dates clinical drug supplies were received and returned to Amgen or its designee.  If errors or 
damages in the clinical drug supply shipments occur, the Investigator should contact Amgen or 
its designee immediately.  Copies of the study medication accountability records will be 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
39 of 84 
06 Aug 2020 
provided by each Investigator for inclusion in the Trial Master File (TMF).  The CRA will 
periodically check the supplies of study medication held by the Investigator or Pharmacist to 
verify accountability of all medication used. 
The Investigator will administer the medication only to the identified subjects of this study, 
according to the procedures described in this study protocol.  After the EOS, all unused 
medication and all medication containers should be destroyed on-site (if approved by the sponsor 
or designee) or returned to Amgen or its designee for destruction.  In either instance, complete 
documentation will be returned to the sponsor or designee.  Further guidance and information for 
the final disposition of unused study medication are provided in the Pharmacy Manual. 
The investigational product resupply will be managed by the IXRS. 
6.1.4 
Product Complaints 
A product complaint is any written, electronic, or oral communication that alleges deficiencies 
related to the identity, quality, durability, reliability, safety, effectiveness, or performance of a 
drug(s) or device(s) after it is released for distribution to market or clinic by either Amgen or by 
distributors and partners for whom Amgen manufactures the material. 
Any product complaint(s) associated with an ABP 654 or ustekinumab supplied by Amgen are to 
be reported according to the instructions provided in the Pharmacy Manual.  Any product 
complaints associated with an AE are to be reported as per AE reporting guidelines. 
6.1.5 
Prohibited Treatments  
• Nonstudy use of ustekinumab, or therapies that target IL-12 or IL-23, are prohibited 
(Exclusion Criterion 13) 
• Live viral or live bacterial vaccination.  The study drug should be withheld for at least 
15 weeks before vaccination and only resumed at least 2 weeks after vaccination 
• Any biologic treatment for psoriasis, or any experimental (biological or nonbiological) 
therapy (within or outside of a clinical study), except for the investigational product, for 
subjects are prohibited (Exclusion Criteria 14 and 15) 
• Treatments (Exclusion Criterion 16) which include non-biologic systemic psoriasis 
therapy (including but not limited to oral retinoids, methotrexate, cyclosporine, 
systemically administered calcineurin inhibitors, azathioprine, thioguanine, hydroxyurea, 
fumarates, mycophenolate mofetil, JAK inhibitors, or oral or parenteral corticosteroids 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
40 of 84 
06 Aug 2020 
including intramuscular or intraarticular administration [exception: ophthalmic, otic, 
nasal, or inhaled corticosteroids within recommended doses is permitted]) 
• Any other nonstudy treatment for psoriasis, including UVA or UVB phototherapy and 
excimer laser (Exclusion Criterion 17) and topical therapies for psoriasis (except for 
those specifically allowed, Exclusion Criterion 18) are prohibited 
6.2 Measures to Minimize Bias: Blinding and Randomization 
6.2.1 
Blinding 
The study is double-blinded; therefore, the Investigators, study personnel with the exception of 
the Parexel unblinded biostatistician and unblinded programmers; and the DMC, and the study 
subjects will remain blinded to treatment allocation. 
Randomization data will be kept strictly confidential, accessible only to authorized staff and the 
DMC until the time of unblinding.  Authorized staff includes the randomization statistician, who 
will store the master randomization list in a secure system, an unblinded statistician, and 
unblinded programmers, who will provide the DMC with unblinded data for review, as and when 
required, in accordance with the procedures described in the DMC Charter.  All authorized 
unblinded staff must be documented.  Personnel unblinded for the primary analysis will not be 
subsequently involved in study management. 
ABP 654 and ustekinumab will be coded and labeled in a manner that protects blinding. 
Unblinding is only allowed in the case of an emergency, when knowledge of the investigational 
product is essential for the clinical management of the subject.  The Investigator must make 
every effort to contact the sponsor or designee’s medical monitor prior to breaking the blind and 
must contact the sponsor or designee within 1 working day after the event, without revealing to 
the sponsor (or CRO) the results of the code break, except to the designated global subject safety 
representative. 
Emergency unblinding will be organized through the IXRS.  The Investigator must record the 
date of unblinding and the reason.  All unblinding must be adequately documented. 
If a SAE is reported, the designated global subject safety representative may unblind the 
treatment assignment for the individual subject through IXRS in order to meet regulatory 
reporting requirements.  Authorized staff will be provided with a unique Personal Identification 
Number (PIN) to access the IXRS to obtain blinding information.  The PIN is unique to the 
individual and must not be shared. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
41 of 84 
06 Aug 2020 
6.2.2 
Randomization 
Upon completion of screening and confirming the subject met all eligibility criteria, the site will 
contact the IXRS to receive a unique subject randomization number in order to randomize the 
subject centrally to receive either ABP 654 or ustekinumab in a 1:1 manner.  Randomization will 
be stratified according to the following factors: prior biologic use for psoriasis (yes vs no), 
baseline BW (≤ 100 kg vs > 100 kg), and geographic region.  Subjects with prior biologic use 
will be capped at 50% of the total randomized subjects. 
At week 28, subjects with PASI 50 or better improvement will be re-randomized 1:1 to receive 
either ustekinumab (SC, Q12W) or ABP 654 (SC, Q12W) (Section 4.1), using the same 
stratification factors as the original randomization.  Each subject will receive a second 
randomization number when he/she is re-randomized. 
In the event of a Quality Assurance audit, the auditor(s) will be allowed access to unblinded 
study intervention records at the site(s) to verify that randomization/dispensing has been done 
accurately. 
6.3 Study Intervention Compliance 
Records of study medication used and intervals between visits will be kept during the study.  
Drug accountability will be noted by the CRA during site visits and at the completion of the 
study.  The study treatment should be dispensed by the Investigator, or by a qualified individual 
under the Investigator’s supervision.  An up-to-date treatment inventory/dispensing record must 
be maintained. 
6.4 Prior and Concomitant Therapy 
Prohibited treatments are described in Section 6.1.5. 
Any other treatment (not explicitly excluded) which is considered necessary for the subject’s 
welfare may be given at the discretion of the Investigator.  Allowed treatments include: 
• Bland moisturizers/emollients (without urea or alpha or beta hydroxy acids) are allowed 
as needed during the study 
• Upper mid-strength to least potent (class III to VII) topical steroids are permitted only on 
the palms, soles, face, and intertriginous areas 
• Otic, nasal, ophthalmic, or inhaled CS (eg, to treat asthma) are not considered “systemic 
immunomodulating treatments” and are allowed during the study 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
42 of 84 
06 Aug 2020 
At the screening assessment, prior medication history will be collected. 
Any medication or vaccine (including over-the-counter or prescription medicines, vitamins, 
and/or herbal supplements) that the subject is receiving at the time of randomization or receives 
during the study must be recorded. 
The Medical Monitor should be contacted if there are any questions regarding concomitant or 
prior therapy. 
All subjects who discontinue the study intervention should be offered alternative treatment if 
applicable.  Treatment should be given according to normal clinical practice, after the EOS visit. 
6.5 Dose Modification 
6.5.1 
ABP 654 and Ustekinumab 
As of the date of the issuance of this protocol, ABP 654 has not been tested in clinical studies. 
There are no dose modifications for investigational product (ABP 654 or ustekinumab) on this 
study.  The ABP 654/ustekinumab dose will be based on the subject’s baseline BW and will 
remain the same throughout the study.  Dosing will not be corrected on the basis of BW at 
current visit. 
If the subject presents with a serious infection at the dosing visit(s), the administration of 
investigational product may be delayed (up to 3 days for weeks 4 and 12 and up to 5 days for 
doses thereafter); and subjects with serious infections need to be monitored closely and 
investigational product should not be administered until the infection resolves. 
In the case of delayed or missed dose for any reason, subsequent doses should be administered 
according to the original schedule (ie, at the planned timepoint relative to first dose) 
investigational product dose(s). 
Any toxicities associated or possibly associated with investigational product treatment should be 
managed according to standard medical practice.  A summary of expected adverse drug reactions 
is provided in the Investigator’s Brochure.  Ustekinumab has a terminal half-life of 
approximately 28.1 days, therefore discontinuation results in slow elimination over several 
months and will have no immediate effect. 
If unmanageable toxicity due to investigational product occurs at any time during the study, 
treatment with the investigational product should be discontinued. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
43 of 84 
06 Aug 2020 
6.6 Intervention After the End of the Study 
After completing dosing with investigational product at week 40 and the EOS visit at week 52, 
subjects will have completed the study.  ABP 654 or ustekinumab will not be provided for 
poststudy use. 
6.7 Loss of Subjects to Follow-up 
A subject will be considered lost to follow-up if he or she repeatedly fails to return for scheduled 
visits and is unable to be contacted by the study site. 
The following actions must be taken if a subject fails to return to the clinic for a required study 
visit: 
• The site must attempt to contact the subject and reschedule the missed visit as soon as 
possible (and within the visit window) and counsel the subject on the importance of 
maintaining the assigned visit schedule and ascertain whether or not the subject wishes to 
and/or should continue in the study. 
• In cases in which the subject is deemed lost to follow-up, the Investigator or designee 
must make every effort to regain contact with the subject (where possible, at least 2 
telephone calls and, if necessary, 2 certified letters to the subject’s last known mailing 
address or local equivalent methods).  These contact attempts should be documented in 
the subject’s medical record and electronic case report form (eCRF). 
Should the subject continue to be unreachable, he/she will be considered to be ‘lost to follow-up’ 
and to have withdrawn from the study. 
7 Study Assessments and Procedures 
• Study procedures and their timing are summarized in the SoA (Section 1.3). 
• As protocol waivers or exemptions are not allowed with the exception of immediate safety 
concerns, these should be discussed with the sponsor immediately upon occurrence or 
awareness to determine if the subject should continue or discontinue study intervention. 
• Adherence to the study design requirements, including those specified in the SoA, is 
essential and required for study conduct. 
• All screening evaluations must be completed and reviewed to confirm that potential 
subjects meet all eligibility criteria.  The Investigator will maintain a screening log to 
record details of all subjects screened and to confirm eligibility or record reasons for 
screening failure, as applicable. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
44 of 84 
06 Aug 2020 
• Procedures conducted as part of the subject’s routine clinical management and obtained 
before signing of informed ICF may be utilized for screening or baseline purposes 
provided the procedure met the protocol-specified criteria and were performed within the 
time frame defined in the SoA (Section 1.3). 
• Repeat or unscheduled samples may be taken for safety reasons or for technical issues 
with the samples. 
• Investigational product will be administered after all other procedures are completed for 
each dosing visit. 
7.1 Screening and Eligibility Assessments 
Refer to Section 7.1 for assessments to determine subject eligibility for inclusion in the study. 
Refer to Section 7.2 for efficacy assessments to determine subject eligibility for the study, 
including but not limited to, PASI assessments. 
Refer to Sections 7.3 and 7.4 for relevant safety assessments to determine subject eligibility for 
inclusion in the study, including but not limited to laboratory tests and pregnancy testing. 
7.1.1 
Informed Consent 
All subjects or their legally authorized representative must sign and personally date the IRB/IEC 
approved ICF before any study-specific procedures are performed. 
7.1.2 
Medical History 
Medical history, including any ongoing illnesses, will be collected. 
7.1.2.1 
Disease-specific Medical History 
Moderate to severe plaque psoriasis history will be collected. 
7.1.3 
Demographics 
Demographic data, including (where permitted), date of birth/age, sex, race, and ethnicity will be 
collected. 
7.2 Efficacy Assessments 
7.2.1 
Psoriasis Area and Severity Index (PASI) 
The PASI is a measure of the average redness (erythema), thickness (induration), and scaliness 
(scaling; each graded on a 0–4 scale of the lesions, weighted by the area of involvement 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
45 of 84 
06 Aug 2020 
(Feldman and Krueger, 2005).  All assessments for a given subject should be made by the same 
observer whenever possible. 
7.2.2 
Static Physician Global Assessment (sPGA) 
The sPGA is a 6-point scale (0-5) used to measure the severity of disease (induration, scaling, 
and erythema) [Section 9.3, Appendix 3]).  The sPGA should be completed by the same assessor 
performing the PASI assessments.  All assessments for a given subject should be made by the 
same observer whenever possible. 
7.2.3 
Body Surface Area (BSA) 
The percent of BSA affected (%BSA) is estimated by assuming that the subject’s palm, 
excluding the fingers and thumb, represents roughly 1% of the body’s surface (Chandran, 2009).  
At any given visit, BSA should be performed by the same assessor performing PASI assessment.  
Because of interobserver variability in estimated BSA, all assessments for a given subject should 
be made by the same observer whenever possible. 
7.3 Other Study Assessments 
7.3.1 
Physical Examinations and Weight/Height 
Subjects will undergo physical examinations, as indicated in the SoA (Section 1.3).  Physical 
examination findings will be recorded.  Physical examinations will be performed by a physician 
and will include examination of the following: general appearance, head, ears, eyes, nose, throat, 
neck, skin, cardiovascular system, respiratory system, abdominal system, and nervous system. 
Clinically significant abnormal changes from baseline will be reported as AEs. 
Baseline BW (kg) and height will be measured with the subject dressed in light clothing, without 
shoes or jacket.  Baseline BW and height will be determined at screening.  The baseline BW will 
be measured at baseline. 
Investigators should pay special attention to clinical signs related to previous serious illnesses.  
Any new abnormalities or worsening of existing abnormalities should be reported as AEs, as 
appropriate (Section 7.5). 
7.3.2 
Vital Signs 
Vital signs will be measured after the subject has been resting for 5 minutes and will include 
systolic and diastolic blood pressure, pulse, respiratory rate, and temperature. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
46 of 84 
06 Aug 2020 
Systolic blood pressure and diastolic blood pressure will be measured on the same arm. 
Respiratory rate and temperature will also be recorded. 
During the study, the measurement of vital signs may be repeated at the discretion of the 
Investigator for safety reasons.  Clinically relevant abnormal findings should be reported as AEs. 
7.3.3 
Tuberculosis Testing 
A TB test will be performed at screening by PPD or Quantiferon®/T-spot® test.  PPD tests will 
be performed locally, and Quantiferon®/T-spot® tests will be performed by the local or central 
laboratory.  Subjects with positive PPD or positive or indeterminate Quantiferon®/T-spot® test 
may be eligible based on the sponsor’s TB risk assessment worksheet and the other criteria listed 
in Inclusion Criterion 8. 
7.3.4 
Chest Radiography 
Chest radiography will include anterior/posterior or posterior/anterior and lateral views.  
Historical films or formal reports signed off by a radiologist obtained in the 3 months prior to 
screening are acceptable. 
7.4 Safety Assessments 
Planned time points for all safety assessments are provided in the SoA (Section 1.3). 
7.4.1 
Adverse Events and Serious Adverse Events 
Adverse events and SAEs are defined in Section 7.5.1.  Adverse events and SAEs will be 
followed, recorded, and reported in line with the procedures described in Sections 7.5.3 through 
7.5.6. 
7.4.2 
Events of Interest 
Events of interest for ABP 654/ustekinumab will be defined in the Statistical Analysis Plan 
(SAP) and will be reviewed on an ongoing basis as part of this study.  There are no additional 
expedited reporting requirements for EOI, beyond what is defined for any AE report that 
qualifies to be expedited as part of regulatory reporting rules for investigational products. 
7.4.3 
Anti-Drug Antibodies 
Blood samples for ADA (binding and neutralizing) assessments will be collected at the time 
points indicated in Section 1.3.  Samples should be taken prior to administration of 
investigational product (pre-dose) on dosing visits.  Samples tested positive for binding 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
47 of 84 
06 Aug 2020 
antibodies will also be further assessed for neutralizing antibodies.  Additional blood samples 
may be obtained to rule out ADAs during the study. 
The detection and characterization of antibodies to ABP 654 will be performed using a validated 
assay method by the sponsor or under the supervision of the sponsor. 
7.4.4 
Clinical Safety Laboratory Assessments 
Urine pregnancy tests will be performed locally.  PPD and Quantiferon®/T-spot® tests will be 
performed by the local or central laboratory as described in Section 7.3.3.  All other laboratory 
assessments will be performed by a central laboratory.  Blood and urine samples will be 
collected at the times indicated in Section 1.3.  At visits when investigational product is 
administered, clinical laboratory samples will be collected before investigational product 
administration.  Venous blood samples will be taken for hematology and biochemistry testing at 
visits specified in the SoA (Table 1-1). 
Protocol-required safety laboratory assessments are presented in Table 7-1. 
Table 7-1 
Protocol-Required Safety Laboratory Assessments 
Laboratory Assessments 
Parameters 
Hematology 
Absolute neutrophil count 
Hematocrit 
Hemoglobin 
Platelet count 
RBC count 
WBC count (total) 
WBC count (differential) 
Clinical Chemistry 
BUN 
Potassium 
Total bilirubin 
Creatinine 
Sodium 
Total protein 
Albumin 
Glucose (random) 
Alkaline phosphatase 
AST 
ALT 
gamma-glutamyltransferase 
 
Routine Urinalysis 
pH, specific gravity, creatinine, glucose, bilirubin, blood, and protein 
Other Tests 
Follicle-stimulating hormone and estradiol (as needed in women of 
non-childbearing [WOCBP] potential only) at screening 
Serum hCG pregnancy test (as needed for WOCBP) at screening 
Serology (HbsAg, and HCV) at screening 
TB testing1 (including a TB worksheet and chest X-ray) at screening 
Urine pregnancy tests 
Creatinine clearance 
Immunology (ADA antibody) 
1Quantiferon®/T-spot or purified protein derivative (PPD) testing. 
Abbreviations: ADA = anti-drug antibody; ALT = alanine aminotransferase; AST = aspartate aminotransferase; 
BUN = blood urea nitrogen; HbsAG = hepatitis B surface antigen; hCG = human chorionic gonadotropin; 
HCV = hepatitis C virus; RBC = red blood cell; TB = tuberculosis; WBC = white blood cell; WOCBP = women of 
childbearing potential. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
48 of 84 
06 Aug 2020 
Refer to the Investigator Laboratory Manual for details regarding the collection, processing, and 
shipping of the blood and urine samples. 
The Investigator must review the laboratory reports as described in Section 7.5.3.  Any blood 
samples (eg, PK, immunogenicity) collected according to the SoA (Section 1.3) can be analyzed 
for any of the tests outlined in the protocol and for any tests necessary to minimize risks to study 
subjects.  This includes testing to ensure analytical methods produce reliable and valid data 
throughout the course of the study.  This can also include, but is not limited to, investigation of 
unexpected results, incurred sample reanalysis, and analyses for method transfer and 
comparability. 
Additional and repeat laboratory safety testing may be performed at the discretion of the 
Investigator. 
7.4.4.1 
Clinically Significant Changes in Laboratory Values 
Clinically significant changes in laboratory values are defined in Section 7.5.1.3. 
• All protocol-required laboratory assessments, as defined in Section 1.3 and Table 7-1, 
must be conducted in accordance with the Laboratory Manual and the SoA (Section 1.3) 
• In general, abnormal laboratory findings without clinical significance (based on the 
Investigator's judgment) are not to be recorded as AEs.  However, laboratory value 
changes that require treatment or adjustment in current therapy are considered AEs.  
Where applicable, clinical sequelae (not the laboratory abnormality) are to be recorded as 
the AE 
Investigators must document their review of each laboratory safety report. 
7.4.5 
Pregnancy 
Details of all pregnancies and/or lactation in female subjects and female partners of male 
subjects that occur after the start of study treatment and until 5 months after the last study drug 
injection will be collected. 
If a pregnancy is reported, the Investigator is to inform Amgen within 24 hours of learning of the 
pregnancy and/or lactation and is to follow the procedures outlined in Section 9.2 (Appendix 2).  
Amgen or its designee will follow-up with the Investigator regarding additional information that 
may be requested. 
Abnormal pregnancy outcomes (eg, spontaneous abortion, fetal death, stillbirth, congenital 
anomalies, ectopic pregnancy) are considered SAEs. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
49 of 84 
06 Aug 2020 
Further details regarding pregnancy and lactation are provided in Section 9.2 (Appendix 2).  
Pregnancy is not an AE unless there is suspicion of investigational product interference with 
effectiveness of contraceptive measures. 
7.5 Adverse Events 
7.5.1 
Definitions 
7.5.1.1 
Adverse Events 
An AE is any untoward medical occurrence in a clinical trial subject.  The event does not 
necessarily have a causal relationship with the investigational product.  An AE can therefore be 
an unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or 
disease (new or exacerbated) temporally associated with the use of a treatment, combination 
product, medical device, or procedure.  The Investigator is responsible for ensuring that any AEs 
observed by the Investigator or reported by the subject are recorded in the subject’s medical 
record as well as the eCRF. 
7.5.1.1.1 
Events Meeting the Adverse Event Definition 
Events that meet the AE definition are as follows: 
• Any abnormal laboratory test results (hematology, clinical chemistry, or urinalysis) or 
other safety assessments (eg, vital signs measurements), including those that worsen from 
baseline, that are considered clinically significant in the medical and scientific judgment 
of the Investigator (ie, not related to progression of underlying disease) 
• Exacerbation of a chronic or intermittent pre-existing condition including either an 
increase in frequency and/or intensity of the condition 
• New conditions, including signs and symptoms, detected or diagnosed after study 
treatment administration even though it may have been present before the start of the 
study 
• Signs, symptoms, or the clinical sequelae of a suspected drug-drug interaction 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
50 of 84 
06 Aug 2020 
• Signs, symptoms, or the clinical sequelae of a suspected overdose of either study 
treatment or a concomitant medication.  Overdose associated with any clinical sequelae 
will be considered an AE and reported as an AE/SAE unless it is an intentional overdose 
taken with possible suicidal/self-harming intent.  Such overdoses are to be reported 
regardless of sequelae.  In case of overdosage, it is recommended that the subject be 
monitored for any signs or symptoms of adverse reactions or effects and appropriate 
symptomatic treatment be instituted immediately 
 “Lack of efficacy” or “failure of expected pharmacological action” per se will not be 
reported as an AE or SAE.  Such instances will be captured in the efficacy assessments.  
However, the signs, symptoms, and/or clinical sequelae resulting from lack of efficacy 
will be reported as AE or SAE if they fulfill the definition of an AE or SAE 
7.5.1.1.2 
Events NOT Meeting the Adverse Event Definition 
Events not meeting the AE definition include: 
• Medical or surgical procedure (eg, endoscopy, appendectomy):  the condition that leads to 
the procedure is the AE 
• Situations in which an untoward medical occurrence did not occur (social and/or 
convenience admission to a hospital [inpatient hospitalization for less than 24 hours]) 
• Anticipated day-to-day fluctuations of pre-existing disease(s) or condition(s) present or 
detected at the start of the study that do not worsen 
• A pre-existing condition that has not worsened during the study or involves an 
intervention such as elective cosmetic surgery or a medical procedure while on study is 
not considered an AE 
7.5.1.2 
Serious Adverse Events 
An SAE is defined as any untoward medical occurrence that meets at least 1 of the following 
serious criteria: 
• Results in death (fatal) 
• Life-threatening (places the subject at immediate risk of death) 
• Requires inpatient hospitalization or prolongation of existing hospitalization 
• Results in persistent or significant disability/incapacity 
• Congenital anomaly/birth defect 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
51 of 84 
06 Aug 2020 
• Other medically important serious event 
Definition of Terms 
Life-threatening:  The term “life-threatening” in the definition of “seriousness” refers to an event 
in which the subject was at risk of death at the time of the event.  It does not refer to an event, 
which hypothetically might have caused death, if it were more severe.  For example, 
drug-induced hepatitis that resolved without evidence of hepatic failure would not be considered 
life-threatening even though drug-induced hepatitis can be fatal.  It does not include an AE or 
suspected adverse reaction that, had it occurred in a more severe form, might have caused death. 
Hospitalization:  In general, hospitalization signifies that the subject has been detained (usually 
involving at least an overnight stay) at the hospital or emergency ward for observation and/or 
treatment that would not have been appropriate in the physician's office or outpatient setting.  
Complications that occur during hospitalization are an AE.  If a complication prolongs 
hospitalization or fulfills any other serious criteria, the event is serious.  When in doubt as to 
whether “hospitalization” occurred or was necessary, the AE should be considered serious.  
Hospitalization for elective treatment of a pre-existing condition that did not worsen from 
baseline is not considered an AE. 
Disability/incapacity:  The term disability means a substantial disruption of a person’s ability to 
conduct normal life functions.  This definition is not intended to include experiences of relatively 
minor medical significance such as uncomplicated headache, nausea, vomiting, diarrhea, 
influenza, and accidental trauma (eg, sprained ankle) which may interfere with or prevent 
everyday life functions but do not constitute a substantial disruption. 
Other medically important serious event:  Medical or scientific judgment is to be exercised in 
deciding whether SAE reporting is appropriate in other situations such as important medical 
events that may not be immediately life-threatening or result in death or hospitalization but may 
jeopardize the subject or may require medical or surgical intervention to prevent 1 of the other 
outcomes listed in the above definition.  These events are typically to be considered serious. 
Examples of such events include invasive or malignant cancers, 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 dependency or drug abuse. 
7.5.1.3 
Clinical Laboratory Abnormalities and Other Abnormal Assessments 
The Investigator is responsible for reviewing all laboratory test results, including review of 
laboratory test results prior to subject randomization and reviewing subsequent laboratory test 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
52 of 84 
06 Aug 2020 
results throughout the study.  The Investigator will determine whether an abnormal value in an 
individual study subject represents a clinically significant change from the subject’s baseline 
values.  Laboratory abnormalities without clinical significance (based on the Investigator's 
judgment) should not be recorded as AEs or SAEs.  However, laboratory abnormalities (eg, 
clinical chemistry, hematology, and urinalysis abnormalities) that require medical or surgical 
intervention or lead to investigational product interruption, modification, or discontinuation must 
be recorded as an AE or SAE, as applicable.  Where applicable, clinical sequelae (not the 
laboratory abnormality) are to be recorded as the AE.  In addition, laboratory or other abnormal 
assessments (eg, vital signs) that are associated with signs and/or symptoms must be recorded as 
an AE or SAE if they meet the definition of an AE or SAE as described in Section 7.5.1.  If the 
laboratory abnormality is part of a syndrome, record the syndrome or diagnosis (eg, anemia), not 
the laboratory result (eg, decreased hemoglobin). 
7.5.2 
Assessment of Adverse Events 
7.5.2.1 
Severity 
The Investigator will make an assessment of severity for each AE and SAE reported during the 
study.  The assessment of severity will be based on CTCAE version 4.03: 
http://ctep.cancer.gov/protocolDevelopment/electronic_applications/ctc.htm 
7.5.2.2 
Causality 
The Investigator is obligated to assess the relationship between investigational product and each 
occurrence of each AE or SAE. 
Relatedness means that there are facts or reasons to support a relationship between 
investigational product and the event. 
The Investigator will use clinical judgment to determine the relationship. 
Alternative causes, such as underlying disease(s), concomitant therapy, and other risk factors, as 
well as the temporal relationship of the event to study treatment administration will be 
considered and investigated. 
The Investigator will also consult the IB in his/her assessment. 
For each AE or SAE, the Investigator must document in the medical notes that he/she has 
reviewed the AE or SAE and has provided an assessment of causality. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
53 of 84 
06 Aug 2020 
There may be situations in which a SAE has occurred and the Investigator has minimal 
information to include in the initial report.  However, it is very important that the Investigator 
always make an assessment of causality for every event before the initial transmission of the 
SAE data. 
The Investigator may change his/her opinion of causality in light of follow-up information and 
send a SAE follow-up report with the updated causality assessment. 
The causality assessment is one of the criteria used when determining regulatory reporting 
requirements. 
7.5.3 
Documenting and Reporting Adverse Events 
The Investigator is responsible for ensuring that all AEs observed by the Investigator or reported 
by the subject that occur from the time of randomization through the EOS visit are recorded in 
subject’s medical records as well as the applicable CRF Adverse Event Summary page.  The AE 
grading scale to be used for this study will be CTCAE version 4.03, as described in 
Section 7.5.2.1. 
The Investigator must assign the following AE attributes: 
• Adverse event diagnosis or syndrome(s), if known (if not known, signs or symptoms) 
• Dates of onset and resolution 
• Severity (National Cancer Institute CTCAE version 4.03) 
• Assessment of relatedness to investigational product, other protocol-required therapies or 
devices 
• Action taken 
The Investigator must assess whether the AE is possibly related to the investigational product.  
This relationship is indicated by a “yes” or “no” response to the question: “Is there a reasonable 
possibility that the event may have been caused by the investigational product?” The Investigator 
is responsible for reviewing laboratory test results and determining whether an abnormal value in 
an individual study subject represents a clinically significant change from the subject’s baseline 
values.  In general, abnormal laboratory findings without clinical significance (based on the 
Investigator's judgment) are not to be recorded as AEs.  However, laboratory value changes that 
require treatment or adjustment in current therapy are considered AEs.  Where applicable, 
clinical sequelae (not the laboratory abnormality) are to be recorded as the AE. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
54 of 84 
06 Aug 2020 
The Investigator’s clinical judgment is used to determine whether a subject is to be removed 
from treatment due to an AE.  A subject, or subject’s legal representative, can also voluntarily 
withdraw from treatment due to an AE.  If the subject withdraws consent, the subject is 
encouraged to undergo, at a minimum, an EOS assessment. 
It is the Investigator’s responsibility to review all documentation (eg, hospital notes, laboratory 
reports, and diagnostic reports) related to an AE.  Wherever possible, the Investigator’s 
diagnosis, not the individual signs and symptoms, will be documented as the AE. 
It is not acceptable for the Investigator to send photocopies of the subject’s medical records to 
sponsor or responsible CRO in lieu of completion of the CRF page. 
If specifically requested, the Investigator may need to provide additional follow-up information, 
such as discharge summaries, medical records, or extracts from the medical records.  In this case, 
all subject identifiers, with the exception of the subject number, will be blinded on the copies of 
the medical records before submission to the sponsor or responsible CRO. 
Investigators are not obligated to actively seek AEs or SAEs after the subject’s conclusion of 
study participation.  However, if the Investigator learns of any SAE, including death, at any time 
after a subject has been discharged from the study, and he/she considers the event to be 
reasonably related to the investigational product or study participation, the Investigator must 
promptly notify the sponsor. 
7.5.4 
Reporting of Serious Adverse Events 
The Investigator is responsible for ensuring that all SAEs observed by the Investigator or 
reported by the subject that occur after signing of the ICF through the EOS visit are reported 
using the applicable CRF Adverse Event Summary page or via the paper SAE report form for 
SAEs occurring during screening for subjects not randomized. 
All SAEs must be collected, recorded and transmitted to Amgen, or its designee, within 24 hours 
following the Investigator’s knowledge of the event. 
The Investigator will submit any updated SAE data to the sponsor or designee within 24 hours of 
it being available. 
The criteria for grade 4 in the CTCAE grading scale differs from the regulatory criteria for 
SAEs.  It is left to the Investigator’s judgment to report these grade 4 abnormalities as SAEs. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
55 of 84 
06 Aug 2020 
If the electronic data capture (EDC) system is not functional, the SAE can be reported by faxing 
a completed paper Serious Adverse Event Form or by direct telephone communication with 
Parexel at the numbers provided below.  The event must be updated electronically in the EDC 
system by the clinical study center once the EDC function resumes. 
 
Global reporting of SAEs: 
 
Phone (Safety line): +1 (781) 434-5010 
 
NorthAmerica_Medical@parexel.com 
After the study is completed at a given center, the EDC system will be taken off-line to prevent 
the entry of new data or changes to existing data.  If a center receives a report of a new SAE 
from a study subject or receives updated data on a previously reported SAE after the EDC has 
been taken off-line, then the center can report this information on a paper Serious Adverse Event 
Form. 
7.5.5 
Regulatory Reporting Requirements for Serious Adverse Events 
If a subject is permanently withdrawn from protocol-required therapies because of a SAE, this 
information must be submitted to Amgen, or its designee. 
Prompt notification by the Investigator to the sponsor (or designee) of SAEs is essential so that 
legal obligations and ethical responsibilities towards the safety of subjects and the safety of a 
study treatment under clinical investigation are met. 
The sponsor (or designee) has a legal responsibility to notify both the local regulatory authority 
and other regulatory agencies about the safety of a study treatment under clinical investigation.  
The sponsor (or designee) will comply with country-specific regulatory requirements relating to 
safety reporting to the regulatory authority, IRBs/IECs, and Investigators. 
Individual safety reports must be prepared for suspected unexpected serious adverse reactions 
according to local regulatory requirements and sponsor (or designee) policy and forwarded to 
Investigators as necessary. 
An Investigator who receives an individual safety report describing a SAE or other specific 
safety information (eg, summary or listing of SAEs) from the sponsor (or designee) will file it 
along with the IB and will notify the IRB/IEC, if appropriate according to local requirements. 
To comply with worldwide reporting regulations for SAEs, the treatment assignment of subjects 
who develop serious, unexpected, and related AEs may be unblinded by Amgen or designee 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
56 of 84 
06 Aug 2020 
before submission to regulatory authorities.  Aggregate analyses may also be unblinded by the 
Safety Assessment Team, as appropriate.  Investigators will receive notification of related SAEs 
reports sent to regulatory authorities in accordance with local requirements. 
7.5.6 
Reporting of Serious Adverse Event After the Protocol-required 
Reporting Period 
There is no requirement to monitor study subjects for SAEs following the protocol-required 
reporting period or after the EOS.  However, these SAEs can be reported to Amgen.  Per local 
requirements in some countries, Investigators are required to report SAEs that they become 
aware of after the EOS.  If SAEs are reported, the Investigator is to report them to Amgen within 
24 hours following the Investigator’s knowledge of the event. 
Serious adverse events reported outside of the protocol-required reporting period will be 
captured within the safety database as clinical study cases and handled accordingly based on 
relationship to investigational product. 
7.5.7 
Method of Detecting Adverse Events and Serious Adverse Events 
Care will be taken not to introduce bias when detecting AEs and/or SAEs.  Open-ended and 
nonleading verbal questioning of the subject is the preferred method to inquire about AE 
occurrence. 
7.5.8 
Adverse Event and Serious Adverse Event Follow-up 
During the study the AEs and SAEs should be followed proactively by the Investigator at 
subsequent visits/contact.  All AEs and SAEs will be followed until resolution, stabilization, 
until the event is otherwise explained, or until the subject is lost to follow-up.  At the time the 
subject’s study participation ends, all ongoing AEs and SAEs should be evaluated for resolution.  
All new or updated information for previously reported SAEs must be sent to Amgen within 
24 hours following knowledge of the new information and will be recorded in the originally 
completed Adverse Event CRF.  If specifically requested, the Investigator may need to provide 
additional follow-up information, such as discharge summaries, medical records, or extracts from 
the medical records.  Information provided about the SAE must be consistent with that recorded 
on the Adverse Event CRF. 
The Investigator is obligated to perform or arrange for the conduct of supplemental 
measurements and/or evaluations as medically indicated or as requested by Amgen to elucidate 
the nature and/or causality of the AE or SAE as fully as possible.  This may include additional 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
57 of 84 
06 Aug 2020 
laboratory tests or investigations, histopathological examinations, or consultation with other 
health care professionals. 
If a subject is permanently withdrawn from protocol-required therapies because of a SAE, this 
information must be submitted to Amgen.  If a subject dies during participation in the study, the 
Investigator will provide Amgen with a copy of any post-mortem findings including 
histopathology if available. 
Events of interest are described in Section 7.4.2.  Formal pre-specified evaluations for EOIs are 
not planned at this time. 
7.6 Pharmacokinetics 
During treatment, a series of serum samples will be taken for measurement of serum 
concentration of treatments according to the SoA and sent to central laboratory.   
Details of the procedures to be followed for sample collection, storage, and shipment will be 
documented in the Laboratory Manual. 
Blood samples will be collected from all subjects.  Samples should be taken prior to 
administration of investigational product (pre-dose) on dosing visits. 
The actual date and time (24-hour clock time) of each sample will be recorded. 
Samples collected for analyses of serum drug concentration may also be used to evaluate safety 
or efficacy aspects that address concerns arising during or after the study. 
7.7 Pharmacodynamics 
Pharmacodynamic parameters are not evaluated in this study. 
7.8 Biomarkers 
Biomarkers are not evaluated in this study. 
8 Statistical Considerations 
8.1 General Considerations 
All personnel involved with the analysis of the study will remain blinded until database lock for 
the primary analysis.  Personnel unblinded for the primary analysis will not be further involved 
in the management of the study.  Analyses will be performed using SAS® version 9.4 or higher 
(SAS Institute, Cary, NC, US) by the sponsor or its representatives. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
58 of 84 
06 Aug 2020 
The SAP will be developed and finalized prior to the unblinding for the primary analysis.  The 
SAP will provide a detailed description of the statistical methods and expand on the details 
provided in the protocol. 
All data will be presented by treatment group.  Descriptive statistics (number of observations, 
mean, standard deviation, median, minimum, and maximum) will be provided for continuous 
variables, and counts and percentages will be presented for categorical variables.  Confidence 
intervals (CIs) and other inferential statistics may also be provided. 
In general, baseline will be defined as the last non-missing measurement/procedure before or on 
the date of first administration of investigational product. 
8.2 Statistical Hypotheses 
The analysis of the primary efficacy endpoint will test the following hypotheses: 
Null Hypothesis (H0):  Mean difference in PASI percent improvement from baseline at week 12 
between ABP 654 and ustekinumab is outside an equivalence margin of (-15, 15), 
versus 
Alternative Hypothesis (HA):  Mean difference in PASI percent improvement from baseline at 
week 12 between ABP 654 and ustekinumab is within an equivalence margin of (-15, 15). 
8.3 Sample Size Determination 
Approximately 542 subjects will be randomized in a 1:1 ratio to receive ABP 654 or 
ustekinumab stratified by prior biologic use for psoriasis, geographic region, and BW.  The 
sample size will provide greater than 95% power to demonstrate equivalence at a significance 
level of 0.025 on the primary efficacy endpoint of PASI percent improvement from baseline at 
week 12 with an equivalence margin of (-15, +15), assuming a common standard deviation of 
30.0 (Leonardi, 2008; Papp, 2008), a true mean difference of 0 in the primary efficacy endpoint 
between the 2 groups, and a 10% dropout rate. 
8.4 Populations for Analyses 
For purposes of analysis, the following analysis sets are defined below and in Table 8-1: 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
59 of 84 
06 Aug 2020 
Table 8-1 
Populations for Analysis 
Population (Analysis Set) 
Description 
Full Analysis Set (FAS) 
The FAS comprises all randomized subjects.  This analysis set will be 
analyzed according to the treatment the subject is randomized to 
(regardless of actual treatment received) and will be used for 
analyses/summaries of the primary efficacy endpoint as well as for all 
secondary efficacy endpoints. 
Per Protocol Analysis Set 
The Per Protocol Analysis Set consists of all subjects in the FAS who have 
completed dosing at day 1 and week 4, and have completed PASI 
assessment at week 12 without experiencing an important protocol 
deviation that may affect their evaluation for the primary endpoint of the 
study. 
 
This analysis set will be analyzed according to actual treatment received 
and will be used for sensitivity analyses for the primary and key secondary 
efficacy endpoints. 
Safety Analysis Set 
The Safety Analysis Set consists of all randomized subjects who receive at 
least one dose of investigational product and will be analyzed according to 
actual treatment received.  This analysis set will be used for summaries of 
safety data, as well as immunogenicity data and PK data. 
 
8.5 Planned Analyses 
The primary efficacy analysis of the study will be performed after all subjects randomized reach 
week 32 or terminate early.  The final analysis will be performed when all subjects randomized 
reach the week 52 visit or terminate early.  Below is a description of the planned statistical 
analyses.  Further details are presented in the SAP. 
8.5.1 
Primary Efficacy Endpoint 
The primary analysis of the primary endpoint will be performed in the FAS with missing value 
imputed using last observation carried forward (LOCF) method.  Clinical equivalence of the 
primary endpoint will be evaluated by comparing the 2-sided 95 CI of the mean difference of 
PASI percent improvement from baseline to week 12 between ABP 654 versus ustekinumab 
with an equivalence margin of (-15, +15).  Clinical equivalence of the primary endpoint for 
Japan will be evaluated by comparing the 2-sided 95% CI of the mean difference of PASI 
percent improvement from baseline to week 12 between ABP 654 versus ustekinumab in 
subjects with baseline BW ≤ 100 kg (and hence are to receive the 45 mg dose) against the (-15, 
+15) margin.  The least squares (LS) mean difference between the 2 treatment groups and the 
95 CI of the difference will be estimated using an analysis of covariance (ANCOVA) model 
with the baseline PASI value and stratification factors as covariates. 
Sensitivity analyses will be performed using observed data for both the FAS and the Per Protocol 
Analysis Set. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
60 of 84 
06 Aug 2020 
8.5.2 
Secondary Efficacy Endpoints 
All secondary efficacy endpoints will be analyzed descriptively. 
PASI percent change from baseline at other timepoints will be summarized by visit and will be 
analyzed based on LOCF and as observed in the FAS.  PASI percent change from baseline at 
week 4 and 12 will also be summarized as observed in the Per Protocol Analysis Set.  The LS 
mean differences and 95% CIs of PASI percent improvement between the initial randomized 
groups (ABP 654 vs ustekinumab) or between the re-randomized groups (ABP 654/ABP 654, 
ustekinumab/ustekinumab, and ustekinumab/ABP 654) at other scheduled visits will be 
estimated using ANCOVA models similar to that used for the primary efficacy endpoint.  The 
BSA change from baseline at week 12 and week 52 will be analyzed similarly. 
PASI 75 and PASI 100 are defined as at least 75%, or 100%, respectively, improvement from 
baseline in PASI, respectively.  PASI 75 and PASI 100 response rates will be summarized at 
each scheduled timepoint via non-responder imputation and as observed in the FAS.  The 
response rates for week 4 and 12 will also be summarized as observed in the Per Protocol 
Analysis Set.  Generalized linear models with an identity link will be used to obtain the point 
estimate and 95% CI for the risk difference of PASI 75 and PASI 100 response rates at each 
scheduled timepoint. 
The sPGA responses (0/1) at week 12 and week 52 (Section 9.3, Appendix 3) will be analyzed 
similarly as PASI 75 and PASI 100 response rates. 
Separate descriptive summaries by initial randomized groups (ABP 654 vs ustekinumab) will be 
provided for post week 28 timepoints in subjects with dose intensification. 
8.5.3 
Safety Endpoints 
Safety endpoints will be summarized descriptively in the Safety Analysis Set based on the actual 
treatment received.  In general, summaries will be provided separately from day 1 (first 
investigational product administration) until week 12, from day 1 through week 28, from 
week 28 through the EOS, and from day 1 through the EOS.  The summaries for day 1 through 
week 12 and from day 1 through week 28 will be presented by treatment (ABP 654 vs 
ustekinumab).  The summaries for week 28 through the EOS and day 1 through the EOS will be 
presented by treatment sequence (ABP 654/ABP 654, ustekinumab/ustekinumab, and 
ustekinumab/ABP 654) for subjects who are re-randomized and treated post re-randomization.  
Safety data from week 28 through the EOS for subjects with dose intensification will be 
summarized separately by treatment (ABP 654 vs ustekinumab). 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
61 of 84 
06 Aug 2020 
All reported AEs will be assigned the SOC and preferred term according to the latest MedDRA 
dictionary as of the time of the primary analysis and graded by CTCAE.  The number and 
percent of subjects reporting TEAEs, SAEs, and EOIs will be tabulated.  Treatment-emergent 
adverse events (and serious TEAEs) are defined as those that occur on or after the time of first 
treatment up to EOS visit. 
Laboratory data (hematology, serum chemistry, and urinalysis) will be converted to Système 
International (SI) units for reporting purposes.  Absolute values and changes from baseline will 
be summarized descriptively by visit. 
The number and percentage of subjects developing binding ADAs and neutralizing ADAs will 
be tabulated by visit and by treatment.  Only subjects who were re-randomized and treated post 
re-randomization and had a result post re-randomization will be included in the analyses for 
week 28 through the EOS visit.  Subjects who were not re-randomized or were not treated post 
re-randomization will be excluded from the analyses for day 1 through the EOS visit.  
8.5.4 
Pharmacokinetic Analyses 
Serum ABP 654 and ustekinumab concentrations from PK sampling will be summarized 
descriptively for the Safety Analysis Set by treatment for each sampling timepoint. 
8.5.5 
Demographic and Baseline Characteristics 
Demographic characteristics (including age, sex, ethnicity, and race) and baseline characteristics 
(including height, BW, body mass index, and disease characteristics) will be presented by 
treatment descriptively for each of the analysis sets defined in Section 8.4. 
8.5.6 
Exposure to Investigational Product 
Exposure to ABP 654/ustekinumab will be summarized descriptively in the Safety Analysis Set 
for each treatment group for the different reporting periods specified for the safety analyses in 
Section 8.5.3. 
8.5.7 
Exposure to Prior and Concomitant Medications 
Prior and concomitant medications will be coded using the latest available World Health 
Organization Drug Dictionary as of the time of the primary analysis and summarized 
descriptively for the Safety Analysis Set. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
62 of 84 
06 Aug 2020 
8.5.8 
Subgroup Analyses and Covariates 
The stratification factors will be included as covariates in statistical models for the efficacy 
analyses.  Subgroup analyses will be conducted to evaluate consistency of treatment effect in 
subgroups defined by the stratification factors and other baseline covariates. 
Full details of the subgroup analyses and covariates will be prespecified in the SAP. 
8.5.9 
Interim Analyses 
No interim analysis is planned. 
8.5.10 Handling of Missing Data 
The handling of missing data for efficacy endpoints are provided in Sections 8.5.1 and 8.5.2. 
Missing data for safety endpoints will not be imputed.  If dates are missing or incomplete for an 
AE (including deaths), or concomitant medication, a further algorithm will be provided in the 
SAP. 
9 Supporting Documentation and Operational Considerations 
9.1 Appendix 1: Regulatory, Ethical, and Study Oversight Considerations 
9.1.1 
Regulatory and Ethical Considerations 
This study will be conducted in accordance with the protocol and with consensus ethical 
principles derived from international guidelines including the general principles in the 
Declaration of Helsinki and Council for International Organizations of Medical Sciences 
International Ethical Guidelines, applicable ICH GCP guidelines, and applicable laws and 
regulations.  The protocol, protocol amendments, ICF, Investigator’s Brochure, and other 
relevant documents (eg, advertisements) must be submitted to an IRB/IEC by the Investigator 
and reviewed and approved by the IRB/IEC before the study is initiated.  Any amendments to the 
protocol will require IRB/IEC approval before implementation of changes made to the study 
design, except for changes necessary to eliminate an immediate hazard to study subjects.  The 
Investigator will be responsible for providing written summaries of the status of the study to the 
IRB/IEC annually or more frequently in accordance with the requirements, policies, and 
procedures established by the IRB/IEC.  The Investigator will also be responsible for notifying 
the IRB/IEC of SAEs or other significant safety findings as required by IRB/IEC procedures, and 
ensuring that the overall conduct of the study at the site and adherence to requirements of the US 
Food and Drug Administration (FDA) 21 CFR, ICH GCP guidelines, the IRB/IEC, European 
regulation 536/2014 for clinical studies (if applicable), and all other applicable local regulations. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
63 of 84 
06 Aug 2020 
9.1.2 
Good Clinical Practice 
This study will be conducted in accordance with the protocol and with the Note for Guidance on 
ICH GCP Harmonised Tripartite Guideline E6 (R1)/Integrated Addendum E6 (R2); US FDA 
CFR (Title 21 Parts 50, 56, 312), requirements for the conduct of clinical studies as provided in 
the EU Directive 2001/20/EC; the general guidelines indicated in the Declaration of Helsinki; 
and all applicable laws and regulatory requirements. 
9.1.3 
Institutional Review Board 
Before initiating a study, the Investigator/institution must have written and dated 
approval/favorable opinion from the IRBs/IECs for the study protocol/amendment(s), written 
ICF, any ICF updates, subject recruitment procedures (eg, advertisements), and any written 
information to be provided to subjects and a statement from the IRBs/IECs that these comply 
with GCP requirements (if applicable).  A current copy of the IB should be included as part of 
the written application to the IRB/IEC. 
A copy of the written approval of the protocol and ICF must be received by Amgen or designee 
before recruitment of subjects into the study and shipment of Amgen investigational product. 
Amgen may amend the protocol at any time.  The IRB/IEC approval(s) must identify the 
protocol version as well as the documents reviewed.  Any amendments to the protocol will 
require IRB/IEC approval before the implementation of the changes made to the study, except 
for changes necessary to eliminate an immediate hazard to the study subjects. 
The Investigator will be responsible for the following: 
• Providing written summaries of the status of the study to the IRB/IEC annually or more 
frequently in accordance with the requirements, policies, and procedures established by 
the IRB/IEC 
• Notifying the IRB/IEC of SAEs or other significant safety findings, including adverse 
drug reactions that are both serious and unexpected, as required by IRB/IEC procedures 
• Providing oversight of the conduct of the study at the study center and adherence to the 
requirements of all applicable regulations 
• Promptly reporting deviations from, or changes to, the protocol to eliminate immediate 
hazards to the study subjects 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
64 of 84 
06 Aug 2020 
• Obtaining annual IRB/IEC approval/renewal throughout the duration of the study.  Copies 
of the Investigator’s reports and the IRB/IEC continuance of approval must be sent to 
Amgen or designee 
9.1.4 
Informed Consent 
In obtaining and documenting informed consent, the Investigator should comply with the 
applicable regulatory requirement(s) and should adhere to GCP and to the ethical principles that 
have their origin in the Declaration of Helsinki.  Prior to the beginning of the study, the 
Investigator should have the IRB/IEC's written approval/favorable opinion of the written ICF 
and any other written information to be provided to subjects. 
• The Investigator or his/her representative will explain the purpose and nature of the study 
as well as possible adverse effects to the subject or his/her legally acceptable 
representative and answer all questions regarding the study. 
• Subjects must be informed that their participation is voluntary, and consent can be 
withdrawn at any point. 
• Subject data up to withdrawal of consent will be included in the analysis of the study, and 
where permitted, publicly available data can be included after withdrawal of consent. 
• Subjects or their legally acceptable representative will be required to sign a statement of 
informed consent that meets the requirements of US FDA CFR Title 21 Part 50, local 
regulations, ICH guidelines, Health Insurance Portability and Accountability Act (HIPAA) 
requirements where applicable, and the IRB/IEC or study center. 
• Prior to a subject’s participation in the study, the written ICF should be signed and 
personally dated by the subject or by the subject's legally acceptable representative, and 
by the person who conducted the informed consent discussion. 
• The medical record must include a statement that written informed consent was obtained 
before the subject was randomized to the study and the date the written consent was 
obtained.  Subject withdrawal of consent or discontinuation from study, study treatment, 
and/or procedures must also be documented in the subject’s medical records. 
• The original copy of the signed ICF will be retained at the study center. 
• A copy of the ICF and any other written information must be provided to the subject or the 
subject’s legally acceptable representative. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
65 of 84 
06 Aug 2020 
• If the ICF is revised, the revised ICF must have received the IRB/IEC's approval/favorable 
opinion in advance of its use.  Subjects must be informed of the changes to the ICF and 
must re-consent to the most current version during their participation in the study.  The 
subject or the subject’s legally acceptable representative should be informed in a timely 
manner if new information becomes available that may be relevant to the subject’s 
willingness to continue participation in the study.  The communication of this information 
should be documented. 
• The Investigator is also responsible for asking the subject if the subject has a primary care 
physician and if the subject agrees to have his/her primary care physician informed of the 
subject’s participation in the clinical study unless it is a local requirement.  If the subject 
agrees to such notification, the Investigator is to inform the subject’s primary care 
physician of the subject’s participation in the clinical study.  If the subject does not have a 
primary care physician and the Investigator will be acting in that capacity, the Investigator 
is to document such in the subject’s medical record. 
If a subject is unable to read or if a legally acceptable representative is unable to read, an 
impartial witness should be present during the entire informed consent discussion.  The witness 
should sign and personally date the ICF after: 
• The written ICF and any other written information to be provided to subjects is read and 
explained to the subject or the subject’s legally acceptable representative 
• The subject or the subject’s legally acceptable representative has orally consented to the 
subject’s participation in the study 
• The subject or the subject’s legally acceptable representative has signed and personally 
dated the ICF, if they are capable of doing so 
By signing the ICF, the witness attests that the information in the ICF and any other written 
information was accurately explained to, and apparently understood by, the subject or the 
subject's legally acceptable representative, and that informed consent was freely given by the 
subject or the subject’s legally acceptable representative. 
9.1.5 
Data Monitoring Committee (DMC) 
For details on the DMC, refer to DMC Charter.  The DMC will evaluate unblinded safety data 
throughout the study and convene approximately every 6 months after the first subject is enrolled 
to review safety data and issue recommendations.  The DMC’s constitution and the details of 
their roles and responsibilities are described in the DMC Charter. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
66 of 84 
06 Aug 2020 
A DMC will be formed with members consisting of individuals external to Amgen and the CRO 
chosen for their expertise in plaque psoriasis.  Members of the DMC will include, at a minimum, 
physicians and statistician(s).  The primary role of this independent DMC will be to monitor 
safety data. 
In addition, the DMC will communicate any major safety concerns and recommendations 
regarding study modification or termination to Amgen senior management at any time during the 
conduct of the study. 
Records of DMC meetings will be maintained by the CRO in a restricted, unblinded location for 
the duration of the study.  Meeting records will be transferred and stored in the study TMF at the 
conclusion of the study.  Selected Amgen, or its designee, staff may serve as liaisons with the 
DMC, but will not be voting members.  Personnel at Amgen or its designee involved in 
preparation or review of DMC unblinded materials will not be otherwise involved in the study. 
9.1.6 
Financing and Insurance  
9.1.6.1 
Contractual and Financial Details 
The Investigator (and/or, as appropriate, the hospital administrative representative) and Amgen, 
or its designee, will sign a clinical study agreement prior to the start of the study, outlining 
overall Amgen, or its designee, and Investigator responsibilities in relation to the study. 
9.1.6.2 
Insurance, Indemnity, and Compensation 
The sponsor will take out reasonable third-party liability insurance cover in accordance with all 
legal requirements.  The civil liability of the Investigator, the persons instructed by him or her 
and the hospital, practice, or institute in which they are employed and the liability of the sponsor 
with respect to financial loss due to personal injury and other damage that may arise as a result of 
the carrying out of this study are governed by the applicable law. 
The sponsor will arrange for subjects participating in this study to be insured against financial 
loss due to personal injury caused by the pharmaceutical products being tested or by medical 
steps taken in the course of the study. 
9.1.6.3 
Financial Disclosure 
Investigators and sub Investigators will provide the sponsor or designee with sufficient, accurate 
financial information as requested to allow the sponsor to submit complete and accurate financial 
certification or disclosure statements to the appropriate regulatory authorities. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
67 of 84 
06 Aug 2020 
9.1.7 
Data and Records Management 
All clinical study information should be recorded, handled, and stored in a way that allows its 
accurate reporting, interpretation, and verification.  This principle applies to all records 
referenced in this protocol, irrespective of the type of media used. 
A CRF will be used to store and transmit subject information.  The CRF must be reviewed and 
electronically signed and dated by the Investigator on an ongoing basis throughout the study.  
The Investigator is responsible for verifying that the data entries are accurate and correct by 
signing the CRF. 
Access to the CRF will be strictly password protected and limited to personnel directly 
participating in the study.  Data should be entered into the CRF completely by authorized site 
personnel (eg, Investigators and the study coordinator).  The CRF must be completed as soon as 
possible after any subject evaluation or communication.  If data are to be changed due to 
erroneous input or other reason, an electronic audit trail will track these changes.  The CRFs and 
computers that store them must be accessible to CRAs and other regulatory auditors.   
During each study visit, a physician participating in the study will maintain progress notes in the 
subject’s medical records to document all significant observations.  At a minimum, these notes 
are to contain: 
• The date of the visit and the corresponding day or visit in the study schedule 
• General condition and status remarks by the subject, including any significant medical 
findings.  The severity, frequency, duration, and resolution of any reported AE, and the 
Investigator's assessment as to whether or not the reported AE is related to IP 
• Changes (including dosages) in concomitant medications/therapies (including over-the-
counter medications and vitamins or dietary supplements) or procedures 
• A general reference to the procedures completed 
• The signature or initials of all physicians making an entry in the medical record (progress 
notes) 
In addition, any contact with the subject by telephone or other means that provides significant 
clinical information is to also be documented in the medical record (progress notes), as described 
above. 
Information from the medical records (progress notes) and other source documents is to be 
promptly entered into the appropriate section of the CRF. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
68 of 84 
06 Aug 2020 
Changes to information in the medical record (progress notes) and other source documents are to 
be initialed and dated on the day the change is made by the Investigator (or designee).  If the 
reason for the change is not apparent, a brief explanation for the change is to be written adjacent 
to the change.  Changes to the CRF will be electronically tracked. 
The CRO data management department will write a Data Management Plan, which will be 
finalized prior to performing any data validation. 
9.1.7.1 
Source Documentation 
Source documents contain the results of original observations and activities of a clinical 
investigation.  They are the original records in which raw data are first recorded.  Source 
documents include, but are not limited to, medical records (progress notes), computer printouts, 
screening logs, completed scales, and recorded data from automated instruments. 
The Investigator/site personnel should maintain adequate and accurate source documents and 
study records that include all pertinent observations on each of the study center’s study subjects.  
Source data should be attributable, legible, contemporaneous, original, accurate, and complete.  
Changes to source data should be traceable, should not obscure the original entry, and should be 
explained if necessary (eg, through an audit trail). 
All source documents from this study are to be maintained by the Investigator and made 
available for inspection by authorized persons.  The Investigator will provide direct access to 
source documents/data for study-related monitoring, audits, IRB/IEC review, and regulatory 
inspections.  They will be carried out giving due consideration to data protection and medical 
confidentiality.  The sponsor should verify that each subject has consented, in writing, to direct 
access to his/her original medical records for study-related monitoring, audit, IRB/IEC review, 
and regulatory inspection. 
During the study, a CRA will make site visits to review protocol compliance, compare eCRF 
entries and individual subject’s medical records, assess drug accountability, and ensure that the 
study is being conducted according to pertinent regulatory requirements.  The eCRF entries will 
be verified with source documentation. 
9.1.7.2 
Case Report Form 
The file structure and format for the CRF will be provided by the sponsor or its representative 
and should be handled in accordance with the instructions provided. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
69 of 84 
06 Aug 2020 
Data will be entered/loaded into a validated electronic database using a clinical data management 
system.  Computerized data cleaning checks will be used in addition to manual review to check 
for discrepancies and to ensure consistency of the data. 
If corrections are needed, the responsible monitor or data manager will raise a query in the EDC 
application.  The appropriate staff at the study site will answer queries sent to the Investigator.  
The name of the staff member responding to the query, and time and date stamp will be captured 
to provide an audit trail.  Once all source data verification is complete and all queries are closed, 
the sponsor or designee will freeze the eCRF page. 
The specific procedures to be used for data entry and query resolution using the EDC 
system/eCRF will be provided to study sites in a training manual.  In addition, site personnel will 
receive training on the EDC system/eCRF. 
9.1.7.3 
Study Files and Record Retention 
All data derived from the study will remain the property of the sponsor.  The sponsor assumes 
accountability for actions delegated to other individuals, eg, the CRO. 
Records must be retained in accordance with the current ICH Guidelines on GCP.  All essential 
study documents, including records of subjects, source documents, CRFs, and the IP inventory, 
must be kept on file. 
Essential documents should be retained until at least 2 years after the last approval of a 
marketing application in an ICH region and until there are no pending or contemplated marketing 
applications in an ICH region, or until at least 2 years have elapsed since the formal 
discontinuation of clinical development of ABP 654.  However, essential documents may be 
retained for a longer period if required by the applicable regulatory requirements or by 
agreement with the sponsor.  The sponsor is responsible for informing the Investigator when 
these documents need no longer be retained. 
If an Investigator moves, withdraws from a study, or retires, the responsibility for maintaining 
the records may be transferred to another person who will accept responsibility.  Notice of 
transfer must be made to and agreed by the sponsor. 
Source documents provide evidence for the existence of the subject and substantiate the integrity 
of the data collected.  Source documents are filed at the Investigator’s site. 
Data reported on the CRF or entered in the eCRF that are transcribed from source documents 
must be consistent with the source documents or the discrepancies must be explained.  The 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
70 of 84 
06 Aug 2020 
Investigator may need to request previous medical records or transfer records, depending on the 
study.  Also, current medical records must be available. 
The study start date is the date on which the first subject is randomized to the study  The EOS 
date is defined as the date when the last subject across all centers is assessed or receives an 
intervention for evaluation in the study (ie, last subject visit) or has withdrawn prematurely, as 
applicable. 
The sponsor reserves the right to close the study site or terminate the study at any time for any 
reason at the sole discretion of the sponsor.  Study sites will typically be closed upon study 
completion.  A study site is considered closed when all required documents and study supplies 
have been collected and a study site closure visit has been performed. 
The Investigator may initiate study site closure at any time, provided there is reasonable cause 
and sufficient notice is given in advance of the intended termination. 
Reasons for the early closure of a study site by the sponsor or Investigator may include but are 
not limited to: 
• Failure of the Investigator to comply with the protocol, the requirements of the IRB/IEC 
or local health authorities, the sponsor’s procedures, or GCP guidelines 
• Inadequate recruitment of subjects by the Investigator 
• Discontinuation of further study intervention development 
9.1.8 
Publication Policy 
This study will be registered on ClinicalTrials.gov in accordance with applicable laws and 
publication policy, and may also be registered on other publicly accessible websites as necessary.  
The results of the study will be posted for public disclosure within 12 months of study 
completion. 
The sponsor or designee is responsible for preparing and providing the appropriate regulatory 
authorities with the Clinical Study Report (CSR) according to the applicable regulatory 
requirements.  The sponsor should ensure that the CSR meets the standards of the ICH Guideline 
for Structure and Content of Clinical Study Reports (ICH E3). 
To coordinate dissemination of data from this study, Amgen may facilitate the formation of a 
publication committee consisting of several Investigators and appropriate Amgen staff.  The 
criteria described below are to be met for every publication. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
71 of 84 
06 Aug 2020 
Authorship of any publications resulting from this study will be determined on the basis of the 
Uniform Requirement for Manuscripts Submitted to Biomedical Journals International 
committee of Medical Journal Editors’ Recommendations for the Conduct of Reporting, Editing, 
and Publications of Scholarly Work in Medical Journals, which states:  Authorship credit is to be 
based on:  (1) substantial contributions to conception and design, acquisition of data, or analysis 
and interpretation of data; (2) drafting the article or revising it critically for important intellectual 
content; (3) final approval of the version to be published; and (4) agreement to be accountable 
for all aspects of the work in ensuring that questions related to the accuracy or integrity of any 
part of the work are appropriately investigated and resolved.  Authors need to meet conditions 1, 
2, 3, and 4. 
When a large, multicenter group has conducted the work, the group is to identify the individuals 
who accept direct responsibility for the manuscript.  These individuals must fully meet the 
criteria for authorship defined above.  Acquisition of funding, collection of data, or general 
supervision of the research group, alone, does not justify authorship.  All persons designated as 
authors must qualify for authorship, and all those who qualify are to be listed.  Each author must 
have participated sufficiently in the work to take public responsibility for appropriate portions of 
the content.  All publications (eg, manuscripts, abstracts, oral/slide presentations, book chapters) 
based on this study must be submitted to Amgen for review.  The Clinical Trial Agreement 
among the institution, Investigator, and Amgen will detail the procedures for, and timing of, 
Amgen’s review of publications. 
9.1.9 
Auditing and Monitoring 
Sponsor-assigned CRAs will conduct regular center visits to the investigational facilities for the 
purpose of monitoring various aspects of the study, such as assessing subject recruitment, 
compliance with protocol procedures, completeness and accuracy of data entered into the CRFs, 
verification of CRF data against original source documents, occurrence of AEs and the safety 
and rights of subjects are being protected, and that the study is being conducted in accordance 
with the currently approved protocol and any other study agreements, ICH GCP, and all 
applicable regulatory requirements.  The Investigator must agree to sponsor-authorized personnel 
having direct access to the clinical (or associated) files and clinical study supplies (dispensing 
and storage areas) to ensure compliance with applicable regulations, and the Investigator will 
assist with the sponsor’s monitoring activities. 
Quality control will occur at each stage of data handling to ensure that all data are reliable and 
have been processed correctly.  The sponsor should ensure oversight of any study-related duties 
and functions carried out on its behalf, including study-related duties and functions that are 
subcontracted to another party by the sponsor’s contracted CRO(s). 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
72 of 84 
06 Aug 2020 
The CRFs should be completed in a timely manner and on an ongoing basis to allow regular 
review by the CRA. 
Details describing the strategy, responsibilities, and requirements of the study monitoring are 
provided in the Study Monitoring Plan. 
The purpose of an audit is to assess whether ethics, regulatory, and quality requirements are 
being fulfilled.  The sponsor or its representative may conduct audits at the investigative centers 
including, but not limited to, drug supply, presence of required documents, the informed consent 
process, and comparison of CRFs with source documents.  Government regulatory authorities 
may also inspect the Investigator during or after the study.  The Investigator (or designee) should 
contact the sponsor/CRO immediately if this occurs.  All medical records (progress notes) must 
be available for audit.  The Investigator must agree to participate with audits conducted at a 
convenient time in a reasonable manner. 
9.1.9.1 
Risk and Quality Tolerance Limits 
Perceived risks and quality tolerance limits (QTLs) will be identified and documented before the 
start of the study. 
The sponsor and CRO will review risk control measures periodically to ascertain whether the 
implemented quality management activities remain effective and relevant.  The quality 
management approach and any important deviations from the predefined QTLs (and remedial 
actions adopted) will be described in the CSR. 
9.1.9.2 
Protocol Adherence and Deviations 
The Investigator and site personnel should conduct the study in compliance with the protocol and 
should use continuous vigilance to identify and report protocol deviations. 
A protocol deviation is any change, divergence, or departure from the study design or procedures 
defined in the protocol that may be on the part of the Investigator, site personnel, or the subject. 
Important protocol deviations are a subset of protocol deviations that may significantly impact 
the completeness, accuracy, and/or reliability of the study data or that may significantly affect a 
subject’s rights, safety, or well-being.  For example, important protocol deviations may include 
randomizing subjects in violation of key eligibility criteria designed to ensure a specific subject 
population or failing to collect data necessary to interpret primary endpoints, as this may 
compromise the scientific value of the study. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
73 of 84 
06 Aug 2020 
The Investigator should not implement any deviation from the protocol without agreement from 
the sponsor and prior review and approval from the IRB/IEC of an amendment, except where 
necessary to eliminate an immediate hazard to a study subject. 
In the event of an important protocol deviation, the Investigator will discuss the deviation with 
the sponsor’s medical monitor and will come to an agreement as to whether the subject should be 
withdrawn from the study due to the important protocol deviation. 
9.1.10 Data Protection 
Subjects will be assigned a unique identifier by the sponsor.  Any subject records or datasets that 
are transferred to the sponsor will contain the identifier only; subject names or any information 
which would make the subject identifiable will not be transferred. 
The subject must be informed that his/her personal study-related data will be used by the sponsor 
in accordance with local data protection law.  The level of disclosure must also be explained to 
the subject. 
The subject must be informed that his/her medical records may be examined by Clinical Quality 
Assurance auditors or other authorized personnel appointed by the sponsor, by appropriate 
IRB/IEC members, and by inspectors from regulatory authorities. 
9.1.11 Protocol Approval and Amendment 
Protocol modifications, except those intended to reduce immediate risk to study subjects, may be 
made only by the sponsor. 
Any permanent change to the protocol must be handled as a protocol amendment.  The written 
amendment must be submitted to the IRB/IEC, and the Investigator must await approval before 
implementing the changes.  The sponsor or designee will submit protocol amendments to the 
appropriate regulatory authorities for approval. 
The current version of the ICF will require similar modification if the IRB/IEC, Investigator, 
and/or sponsor, judge the amendment to the protocol to substantially change the study design 
and/or increase the potential risk to the subject and/or impact the subject's involvement as a study 
subject.  In such cases, the ICF will be renewed for enrolled subjects before their continued 
participation in the study. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
74 of 84 
06 Aug 2020 
9.2 Appendix 2: Contraceptive Guidance and Collection of Pregnancy 
Information 
Study-specific contraception requirements for males and females of childbearing potential are 
outlined in Section 5.2. 
Male and female subjects of childbearing potential must receive pregnancy prevention 
counseling and be advised of the risk to the fetus if they become pregnant or father a child during 
treatment and for 5 months after the last dose of protocol-required therapies. 
Additional medications given during the study may alter the contraceptive requirements.  These 
additional medications may require female subjects to use highly effective methods of 
contraception and/or for an increased length of time.  In addition, male subjects may also be 
required to use contraception.  The Investigator must discuss these contraceptive changes with 
the subject. 
Definition of Woman of Childbearing Potential (WOCBP) 
A woman is considered fertile following menarche and until becoming post-menopausal unless 
permanently sterile (see below). 
If fertility is unclear (eg, amenorrhea in adolescents or athletes) and a menstrual cycle cannot be 
confirmed before first dose of study intervention, additional evaluation should be considered. 
Women in the following categories are not considered WOCBP: 
1. Premenarchal 
2. Premenopausal female with one of the following: 
• Documented hysterectomy 
• Documented bilateral salpingectomy 
• Documented bilateral oophorectomy 
NOTE: Documentation can come from the site personnel’s review of the subject’s medical 
records, medical examination, or medical history interview. 
3. Post-menopausal female 
• A post-menopausal state is defined as no menses for 12 months without an alternative 
medical cause. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
75 of 84 
06 Aug 2020 
o A high follicle-stimulating hormone (FSH) level in the post-menopausal range 
may be used to confirm a post-menopausal state in women not using hormonal 
contraception or hormonal replacement therapy (HRT).  However, in the 
absence of 12 months of amenorrhea, a single FSH measurement (> 40 IU/L 
or mIU/mL) is required. 
• Females on HRT and whose menopausal status is in doubt will be required to use one 
of the non-estrogen hormonal highly effective contraception methods if they wish to 
continue their HRT during the study.  Otherwise, they must discontinue HRT to allow 
confirmation of post-menopausal status before study randomization. 
Contraception Guidance for Male Subjects: 
Male subjects with female partners of childbearing potential are eligible to participate if they 
agree to ONE of the following and for 5 months following the treatment with test article or until 
the scheduled EOS (whichever is longer), as described in Section 5.2: 
• Sexual abstinence (defined as refraining from heterosexual intercourse during the entire 
period of risk associated with protocol-required therapies; the reliability of sexual 
abstinence must be evaluated in relation to the duration of the study and the preferred and 
usual lifestyle of the subject) 
• Use a condom during treatment and for an additional 5 months after the last dose of IP 
• The female partner should consider using an acceptable method of effective contraception 
such as: hormonal, intrauterine device, intrauterine hormonal-releasing system, female 
barrier method (diaphragm, cap, sponge [a female condom is not an option because there 
is a risk of tearing when both partners use a condom]) 
• Note:  If the male’s sole female partner is of nonchildbearing potential or has had a 
bilateral tubal ligation/occlusion, he is not required to use additional forms of 
contraception during the study 
Contraceptive Guidance for Female Subjects: 
Female subjects of childbearing potential are eligible to participate if they agree to use a highly 
effective method of contraception consistently and correctly as described in the table below and 
described in Section 5.2. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
76 of 84 
06 Aug 2020 
Highly Effective Contraceptive Methods That Are User Dependent1 
Failure rate of < 1% per year when used consistently and correctly. 
Combined (estrogen- and progestin-containing) hormonal contraception associated with 
inhibition of ovulation2 
• Oral 
• Intravaginal 
• Transdermal 
Progestogen-only hormonal contraception associated with inhibition of ovulation 
• Oral 
• Injectable 
Highly Effective Contraceptive Methods That Are User Independent1 
Implantable progestogen-only hormonal contraception associated with inhibition of ovulation2 
• Intrauterine device (IUD) 
• Intrauterine hormone-releasing system (IUS) 
• Bilateral tubal occlusion 
Vasectomized Partner 
A vasectomized partner is a highly effective contraception method provided that the partner is 
the sole male sexual partner of the WOCBP and the absence of sperm has been confirmed.  If 
not, an additional highly effective method of contraception should be used. 
Sexual Abstinence 
Sexual abstinence is considered a highly effective method only if defined as refraining from 
heterosexual intercourse during the entire period of risk associated with the study intervention.  
The reliability of sexual abstinence needs to be evaluated in relation to the duration of the study 
and the preferred and usual lifestyle of the subject. 
NOTES: 
1 Typical use failure rates may differ from those when used consistently and correctly.  Use should be consistent 
with local regulations regarding the use of contraceptive methods for subjects participating in clinical studies. 
2 Hormonal contraception may be susceptible to interaction with the study intervention, which may reduce the 
efficacy of the contraceptive method.  In this case, two highly effective methods of contraception should be 
utilized during the intervention period and for at least 5 months following the treatment with test article or until 
the scheduled EOS (whichever is later). 
 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
77 of 84 
06 Aug 2020 
Pregnancy Testing 
• WOCBP should only be included after a confirmed menstrual period and a negative 
highly sensitive serum pregnancy test. 
• Additional pregnancy testing should be performed at intervals during the intervention 
period per the SoA and at the EOS, and as required locally. 
• Pregnancy testing will be performed whenever a menstrual cycle is missed or when 
pregnancy is otherwise suspected. 
• Pregnancy testing, with a sensitivity of 5 mIU/mL will be performed. 
Collection of Pregnancy Information: 
Male Subjects With Partners Who Become Pregnant 
• In the event a male subject fathers a child during treatment, and for an additional 5 months 
after the last dose of investigational product, the information will be recorded on the 
Pregnancy Notification Form.  The form must be submitted to Amgen or its designee 
within 24 hours of the center’s awareness of the pregnancy.  (Note: Sites are not required 
to provide any information on the Pregnancy Notification Form that violates the country 
or regions local privacy laws). 
• The Investigator will attempt to obtain a signed authorization for release of pregnancy and 
infant health information directly from the pregnant female partner to obtain additional 
pregnancy information. 
• After obtaining the female partner’s signed authorization for release of pregnancy and 
infant health information, the Investigator will collect pregnancy outcome and infant 
health information on the pregnant partner and her baby and complete the pregnancy 
questionnaires.  This information will be forwarded to Amgen or its designee. 
• Generally, infant follow-up will be conducted up to 12 months after the birth of the child 
(if applicable). 
• Any termination of the pregnancy will be reported to Amgen or its designee regardless of 
fetal status (presence or absence of anomalies) or indication for procedure. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
78 of 84 
06 Aug 2020 
Female Subjects Who Become Pregnant 
• Investigator will collect pregnancy information on any female subject who becomes 
pregnant while taking protocol-required therapies through 5 months after the last dose of 
investigational product. 
• Information will be recorded on the Pregnancy Notification Form.  The form must be 
submitted to Amgen or its designee within 24 hours of learning of a subject’s pregnancy.  
(Note: Sites are not required to provide any information on the Pregnancy Notification 
Form that violates the country or regions local privacy laws). 
• After obtaining the female subject’s signed authorization for release of pregnancy and 
infant health information, the Investigator will collect pregnancy and infant health 
information and complete the pregnancy questionnaire for any female subject who 
becomes pregnant while taking protocol-required therapies through 5 months after the last 
dose of IP.  This information will be forwarded to Amgen or its designee.  Generally, 
infant follow-up will be conducted up to 12 months after the birth of the child 
(if applicable). 
• Any termination of pregnancy will be reported to Amgen or its designee, regardless of 
fetal status (presence or absence of anomalies) or indication for procedure. 
• While pregnancy itself is not considered to be an AE or SAE, any pregnancy complication 
or report of a congenital anomaly or developmental delay, fetal death, or suspected 
adverse reactions in the neonate will be reported as an AE or SAE.  Note that an elective 
termination with no information on a fetal congenital malformation or maternal 
complication is generally not considered an AE, but still must be reported to Amgen or its 
designee as a pregnancy exposure case. 
• If the outcome of the pregnancy meets a criterion for immediate classification as a SAE 
(eg, female subject experiences a spontaneous abortion, stillbirth, or neonatal death or 
there is a fetal or neonatal congenital anomaly) the Investigator will report the event as a 
SAE. 
• Any SAE occurring as a result of a poststudy pregnancy which is considered reasonably 
related to the study treatment by the Investigator, will be reported to Amgen or its 
designee.  While the Investigator is not obligated to actively seek this information in 
former study subjects, he or she may learn of a SAE through spontaneous reporting. 
• Any female subject who becomes pregnant while participating will discontinue study 
treatment. 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
79 of 84 
06 Aug 2020 
Collection of Lactation Information 
• Investigator will collect lactation information on any female subject who breastfeeds 
while taking protocol-required therapies through 5 months after the last dose of 
investigational product. 
• Information will be recorded on the Lactation Notification Form and submitted to Amgen 
or its designee within 24 hours of the Investigator’s knowledge of event. 
• Study treatment will be discontinued if female subject breastfeeds during the study as 
described in Exclusion Criterion 23 (Section 5.2). 
• With the female subjects signed authorization for release of mother and infant health 
information, the Investigator will collect mother and infant health information and 
complete the lactation questionnaire on any female subject who breastfeeds while taking 
protocol-required therapies through 5 months after discontinuing protocol-required 
therapies.


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
80 of 84 
06 Aug 2020 
9.3 Appendix 3: Static Physician’s Global Assessment (sPGA) Scale 
Below is the sPGA scale that is being used in this study. 
Score Category 
Category Description 
0 
Clear 
• Plaque elevation = 0 (no elevation over normal skin) 
• Scaling = 0 (no scale) 
• Erythema = no evidence, hyperpigmentation may be present 
1 
Almost Clear 
• Plaque elevation = ± (possible but difficult to ascertain 
whether there is a slight elevation above normal skin) 
• Scaling = ± (surface dryness with some white coloration) 
• Erythema = light red coloration 
2 
Mild 
• Plaque elevation = slight (slight but definite elevation, 
typically edges are indistinct or sloped) 
• Scaling = fine (fine scale partially or mostly covering lesions) 
• Erythema = light red coloration 
3 
Moderate 
• Plaque elevation = moderate (moderate elevation with rough 
or sloped edges) 
• Scaling = coarser (coarse scale covering most or all of the 
lesions) 
• Erythema = moderate (definite red coloration) 
4 
Severe 
• Plaque elevation = marked (marked elevation typically with 
hard or sharp edges) 
• Scaling = coarse (coarse, non-tenacious scale predominates 
covering most or all of the lesions) 
• Erythema = severe (very bright red coloration) 
5 
Very Severe 
• Plaque elevation = very marked (very marked elevation 
typically with hard sharp edges) 
• Scaling = very coarse (coarse, thick tenacious scale over most 
of the lesions, rough surface) 
• Erythema = very severe (extreme red coloration, dusky to 
deep red coloration) 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
81 of 84 
06 Aug 2020 
9.4 Appendix 4: Abbreviations and Trademarks 
ADA 
anti-drug antibody 
ADCC 
anti-dependent cell mediated cytotoxicity 
AE 
adverse event 
ALT 
alanine aminotransferase 
ANCOVA 
analysis of variance 
AST 
aspartate aminotransferase 
AUC 
area under the concentration-time curve 
BCG 
Bacillus Calmette-Guérin 
BSA 
body surface area 
BW 
body weight 
CD 
Crohn’s Disease 
CDC 
complement dependent cytotoxicity 
CI 
confidence interval 
Cmax 
maximum observed concentration 
CONSORT 
Consolidated Standards of Reporting Trials 
COVID-19 
coronavirus disease 2019 
CRA 
Clinical Research Associate 
CRF 
case report form(s) (paper or electronic as appropriate for this study) 
CRO 
contract research organization 
CSR 
clinical study report 
CTCAE 
Common Terminology Criteria for Adverse Events 
DMC 
Data Monitoring Committee 
DNA 
deoxyribonucleic acid 
eCRF 
electronic case report form 
EDC 
electronic data capture 
EMA 
European Medicines Agency 
EOI 
events of interest 
EOS 
end of the study 
EU 
European Union 
EudraCT 
European Clinical Trials Database 
FAS 
full analysis set 
FcRn 
Fc neonatal receptor 
FDA 
Food and Drug Administration 
FSH 
follicle-stimulating hormone 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
82 of 84 
06 Aug 2020 
GCP 
Good Clinical Practice 
H0 
null hypothesis 
HA 
alternative hypothesis 
HBsAg 
hepatitis B surface antigen 
HCV 
hepatitis C virus 
HIPAA 
Health Insurance Portability and Accountability Act 
HIV 
human immunodeficiency virus 
HRT 
hormone replacement therapy 
IB 
Investigator’s Brochure 
ICF 
informed consent form 
ICH 
International Conference on Harmonisation 
ICMJE 
International Committee of Medical Journal Editors 
IEC 
Independent Ethics Committee 
IgG 
immunoglobulin-gamma 
IgG 
immunoglobulin-kappa 
IL-12 
interleukin-12 
IL-12Rβ 
interleukin-12 receptor subunit beta 1 
IL-23 
interleukin-23 
IND 
Investigational New Drug 
INR 
international normalized ratio 
IP 
investigational product 
IRB/IEC 
Institutional Review Board/Ethics Committee 
IUD 
intrauterine device 
IUS 
intrauterine hormone-releasing system 
IV 
intravenous 
IXRS 
Interactive Web/Voice Response System 
LOCF 
last observation carried forward 
LS 
least squares 
MedDRA 
Medical Dictionary for Regulatory Activities 
NYHA 
New York Heart Associate 
PASI 
psoriasis area severity index 
PASI 50 
≥ 50% improvement in psoriasis area severity index 
PASI 75 
≥ 75% improvement in psoriasis area severity index 
PBMC 
peripheral blood mononuclear cells 
PFS 
pre-filled syringe 
PGA 
Physician’s Global Assessment 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
83 of 84 
06 Aug 2020 
PIN 
Personal Identification Number 
PK 
pharmacokinetic(s) 
PPD 
purified protein derivative 
Ps 
plaque psoriasis 
PsA 
active plaque psoriasis 
PsO 
psoriasis 
PUVA 
psoralen plus ultra-violet light 
Q12W 
every 12 weeks 
Q8W 
every 8 weeks 
QTL 
quality tolerance limit 
SAE 
serious adverse event 
SAP 
statistical analysis plan 
SARS-CoV2 
severe acute respiratory syndrome coronavirus 2 
SC 
subcutaneous 
SI 
Système International 
SmPC 
Summary of Product Characteristics 
SoA 
schedule of activities 
SOC 
system organ class 
sPGA 
static Physician’s Global Assessment 
t1/2 
half-life 
TB 
tuberculosis 
Tmax 
time of maximal concentration 
TMF 
trial master file 
ULN 
upper limit of normal 
US 
United States 
USPI 
United States Prescribing Information 
UVA 
ultra-violet A 
UVB 
ultra-violet B 
versus 
vs 
WBC 
white blood cell 
WOCBP 
woman of childbearing potential 
 
 


Amgen Proprietary - Confidential 
Sponsor Amgen, Inc. 
Clinical Study Protocol 
20190232 
CONFIDENTIAL 
Final 
84 of 84 
06 Aug 2020 
10 References 
Amgen Inc. ABP 654 – Investigator’s Brochure (Version 1-0). DD Mon 2020. 
BLA 125261 Clinical Pharmacology and Biopharmaeutics Review, 2009. 
Chandran V, Gottlieb A, Cook RJ, Duffin KC, Garg A, Helliwell P, et al. International 
Multicenter Psoriasis and Psoriatic Arthritis Reliability Trial for the Assessment of Skin, Joints, 
Nails, and Dactylitis. Arthritis Rhem. 2009;61(9):1235-1242. doi: 10.1002/art.24562 
Feldman SR, Krueger GG. Psoriasis Assessment Tools in Clinical Trials. Ann Rheum Dis. 
2005;64 suppl 2(Suppl2):ii65-ii68;discussion ii69-ii73. doi 10.1136/ard.2004.031237 
Leonardi CL, Kimball AB, Papp KA, Yeilding N, Guzzo C, Wang Y, et al. Efficacy and safety 
of ustekinumab, a human interleukin-12/23 monoclonal antibody, in patients with psoriasis: 
76-week results from a randomized, double-blind, placebo-controlled trial (PHOENIX 1). 
Lancet. 2008;371:1665-166174. doi: 10.1016/S0140-6736(08)60725-4 
Papp KA, Langley RG, Lebwohl M, Krueger GG, Szapary P, Yeilding N, et al. Efficacy and 
safety of ustekinumab, a human interleukiin-12/23 monoclonal antibody, in patients with 
psoriasis: 52-week results from a randomised, double-blind, placebo-controlled trial 
(PHOENIX 2). Lancet. 2008;2008;371(9625):1675-16184. 
doi: 10.1016/S0140-6736(08)60726-6 
Stelara® Summary of Product Characteristics [SmPC], February 2020. 
Stelara® United States Prescribing Information [USPI], March 2020. 

SAP_001.pdf: 
Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 1 of 39 
CONFIDENTIAL 
 US Specific Statistical Analysis Plan 
Protocol Title: 
A Phase 3, Multicenter, Randomized, Double-Blind 
Study Evaluating the Efficacy and Safety of ABP 
654 Compared with Ustekinumab in Subjects With 
Moderate to Severe Plaque Psoriasis 
Short Protocol Title: 
A Study to Investigate ABP 654 for the Treatment of 
Subjects with Moderate to Severe Plaque Psoriasis 
Protocol Number: 
20190232 
NCT Number: 
NA 
Authors: 
 M.S. 
Sponsor: 
Amgen, Inc 
One Amgen Center Drive 
Thousand Oaks, CA USA 91320 
SAP Date: 
Document Version 
Date 
Original – US (v1.0) 
8 September 2020 
NCT Number: NCT04607980
This NCT number has been applied to the document
for purposes of posting on Clinicaltrials.gov


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 2 of 39 
CONFIDENTIAL  
 
 
Version Number 
Date 
(DDMMMYYYY) 
Summary of Changes,  
including rationale for changes 
Original – US (v1.0) 
08SEP2020 
NA 
 
 
 
 
 
 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 3 of 39 
CONFIDENTIAL  
 
 
SPONSOR SIGNATURE PAGE 
 
 
 
 
 
Approved by:  
_________________________ 
 
_______________ 
MD                                         Date 
 
 
Executive Medical Monitor  
Amgen, Inc. 
 
 
 
 
Approved by:  
_________________________ 
 
_______________ 
 PhD                                              Date 
 
 
Director of Biostatistics  
Amgen, Inc. 
 
 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 4 of 39 
CONFIDENTIAL  
 
 
PAREXEL SIGNATURE PAGE 
 
 
Signatures below confirm that the review process has been completed in accordance 
with SOP-GDO-WW-019. 
 
This document has been approved and signed electronically on the final page by 
the following: 
 
 
Signatory 
Author  
  
Project Role: Biostatistics Lead  
 
 
 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 5 of 39 
CONFIDENTIAL  
 
 
Table of Contents 
Table of Contents ................................................................................................... 5 
1. 
Introduction ........................................................................................................... 10 
2. 
Objectives, Endpoints and Hypotheses ................................................................. 10 
2.1 
Objectives and Endpoints .......................................................................... 10 
2.2 
Hypotheses and/or Estimations ................................................................. 10 
3. 
Study Overview .................................................................................................... 11 
3.1 
Study Design ............................................................................................. 11 
3.2 
Sample Size .............................................................................................. 14 
3.3 
Randomization .......................................................................................... 14 
4. 
Covariates and Subgroups ................................................................................... 14 
4.1 
Planned Covariates ................................................................................... 14 
4.2 
Subgroups ................................................................................................. 15 
5. 
Definitions ............................................................................................................. 15 
5.1 
General ..................................................................................................... 15 
5.2 
Efficacy ..................................................................................................... 21 
5.3 
Safety ........................................................................................................ 22 
6. 
Analysis Sets ........................................................................................................ 23 
6.1 
Full Analysis Set........................................................................................ 23 
6.2 
Re-randomized Full Analysis Set .............................................................. 23 
6.3 
Safety Analysis Set ................................................................................... 24 
6.4 
Re-randomized Safety Analysis Set .......................................................... 24 
6.5 
Per Protocol Set ........................................................................................ 24 
7. 
Planned Analyses ................................................................................................. 24 
7.1 
Interim Analysis and Early Stopping Guidelines ........................................ 24 
7.2 
Primary Analysis ....................................................................................... 24 
7.3 
Final Analysis ............................................................................................ 25 
8. 
Data Screening and Acceptance ........................................................................... 25 
8.1 
General Principles ..................................................................................... 25 
8.2 
Data Handling and Electronic Transfer of Data ......................................... 25 
8.3 
Handling of Missing and Incomplete Data ................................................. 25 
8.4 
Validation of Statistical Analyses ............................................................... 27 
9. 
Statistical Methods of Analysis.............................................................................. 27 
9.1 
General Considerations ............................................................................. 27 
9.2 
Subject Accountability ............................................................................... 28 
9.3 
Important Protocol Deviations ................................................................... 28 
9.4 
Demographic and Baseline Characteristics ............................................... 29 
9.5 
Efficacy Analyses ...................................................................................... 29 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 6 of 39 
CONFIDENTIAL  
 
 
9.5.1 
Analyses of Primary Efficacy Endpoint ...................................... 29 
9.5.1.1 
Primary Analysis ..................................................... 29 
9.5.1.2 
Sensitivity Analyses................................................. 30 
9.5.1.3 
Impact of COVID-19 on missing data ...................... 32 
9.5.2 
Analyses of Secondary Efficacy Endpoint(s).............................. 32 
9.5.2.1 
PASI percent improvement from baseline 
at other timepoints ................................................... 33 
9.5.2.2 
PASI 75 and PASI 100 response 
throughout the study................................................ 33 
9.5.2.3 
sPGA responses at week 12 and week 52 .............. 33 
9.5.2.4 
BSA change from baseline at week 12 and 
week 52 ................................................................... 33 
9.6 
Safety Analyses ........................................................................................ 34 
9.6.1 
Adverse Events ......................................................................... 34 
9.6.2 
Deaths and Serious Adverse Events ......................................... 35 
9.6.3 
Laboratory Test Results ............................................................ 36 
9.6.4 
Vital Signs ................................................................................. 36 
9.6.5 
Physical Examinations ............................................................... 36 
9.6.6 
Immunogenicity ......................................................................... 36 
9.6.7 
Exposure to Investigational Product .......................................... 37 
9.6.8 
Prior and Concomitant Medications ........................................... 37 
9.7 
Other Analyses ......................................................................................... 38 
9.7.1 
Analyses of Pharmacokinetic Endpoints .................................... 38 
9.7.2 
Analyses of Clinical Outcome Assessments .............................. 38 
9.7.3 
Analyses of Health Economic Endpoints ................................... 38 
9.7.4 
Analyses of Biomarker Endpoints .............................................. 38 
10. 
Changes From Protocol-specified Analyses.......................................................... 38 
11. 
Literature Citations / References ........................................................................... 38 
Appendix 1 List of Events of Interest and the Associated SMQ and EOI 
Searching Strategies ............................................................................................ 39 
 
List of Table 
Table 1: Calculation of the Duration of Psoriasis ........................................................... 16 
Table 2:  Imputation Rules for Partial or Missing Start Dates ......................................... 26 
 
 
 
List of Figures 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 7 of 39 
CONFIDENTIAL  
 
 
Figure 1 
Study Schematic ..................................................................................... 13 
 
 
 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 8 of 39 
CONFIDENTIAL  
 
 
List of Abbreviations and Definition of Terms 
 
Abbreviation or Term 
Definition/Explanation 
ADA 
Anti-drug Antibody 
ADaM 
Analysis Data Model 
AE 
Adverse Event 
ALT 
Alanine Aminotransferase 
ANCOVA 
Analysis of Covariance 
AST 
Aspartate Aminotransferase 
BMI 
Body Mass Index 
BSA 
Body Surface Area 
BUN 
Blood Urea Nitrogen 
BW 
Body Weight 
CDISC 
Clinical Data Interchange Standards Consortium  
CI  
Confidence Interval 
CIOMS 
Council for International Organizations of Medical Sciences 
CRF 
Case Report Form  
CRO 
Contract Research Organization 
CTCAE 
Common Terminology Criteria for Adverse Events 
DMC 
Data Monitoring Committee 
EDC 
Electronic Data Capture 
EOI 
Event of Interest 
EOS 
End of Study 
FA 
Final Analysis 
FAS 
Full Analysis Set 
FDA 
Food and Drug Administration 
ICF 
Informed Consent Form 
ICH 
International Council on Harmonisation of Technical Requirements 
for Registration of Pharmaceuticals for Human Use 
IP 
Investigational Product 
IPD 
Important Protocol Deviation 
IXRS 
Interactive Web/Voice Response System 
LOCF 
Last Observation Carried Forward 
MAR 
Missing at Random 
MCAR 
Missing Completely at Random 
MedDRA 
Medical Dictionary for Regulatory Activities 
NCI 
National Cancer Institute  
NRI 
Non-Responder Imputation 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 9 of 39 
CONFIDENTIAL  
 
 
PA 
Primary Analysis 
PASI 
Psoriasis Area Severity Index 
PK 
Pharmacokinetic(s) 
PP 
Per Protocol 
PT 
Preferred Term  
Q1 
25th percentile 
Q3 
75th percentile 
SAE 
Serious Adverse Event 
SAP 
Statistical Analysis Plan 
SAS 
Safety Analysis Set 
SDTM 
Standard Data Tabulation Model 
sPGA 
Static Physician’s Global Assessment 
TEAE 
Treatment-Emergent Adverse Event 
TFL 
Tables, Figures and Listings 
WBC 
White Blood Cell 
WHO-DD 
World Health Organization Drug Dictionary 
 
 
 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 10 of 39 
CONFIDENTIAL  
 
 
1. 
Introduction 
The purpose of this US-specific Statistical Analysis Plan (SAP) is to provide details of 
the statistical analyses that are outlined within the protocol for ABP 654 study 20190232 
(Final, dated 6 August 2020) and the additional analyses to support the BLA submission 
in the US. The scope of this plan includes the primary analysis (PA) and the final 
analysis (FA) that are planned and will be executed by the designated contract research 
organization (CRO), Parexel International. There is a separate Global SAP to support 
the marketing application for other countries. 
2. 
Objectives, Endpoints and Hypotheses 
2.1 
Objectives and Endpoints 
 
Objectives 
Endpoints 
Primary 
Primary efficacy endpoint 
To compare the efficacy of ABP 654 with 
ustekinumab in subjects with moderate to 
severe plaque psoriasis.  
Psoriasis area severity index (PASI) 
percent improvement from baseline to 
week 12 
 
Secondary efficacy endpoints 
 
 
PASI percent improvement at 
other timepoints 
 
PASI 75 response throughout the 
study 
 
PASI 100 response throughout the 
study 
 
Static Physician’s Global 
Assessment (sPGA) responses 
(0/1) at week 12 and week 52 
 
Body surface area (BSA) change 
from baseline at week 12 and 
week 52
Secondary 
To assess the safety and immunogenicity 
of ABP 654 compared to ustekinumab. 
 
Treatment-emergent adverse 
events (TEAEs) and serious 
adverse events (SAEs)  
 
Events of interest (EOI) 
 
Incidence of anti-drug antibodies 
 
 
2.2 
Hypotheses and/or Estimations 
The study will assess the hypothesis that there are no clinically meaningful differences 
between ABP 654 and ustekinumab treatment arms in the primary efficacy endpoint: 
PASI percent improvement from baseline to week 12.  Per the global SAP, this primary 
efficacy endpoint will be evaluated by comparing the 2-sided 95% Confidence Interval 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 11 of 39 
CONFIDENTIAL  
 
 
(CI) of the mean difference of PASI percent improvement from baseline to week 12 
between ABP 654 and ustekinumab arms with an equivalence margin of (-15, +15). For 
the US BLA, this primary efficacy endpoint will be evaluated by comparing the 2-sided 
90% CI of the mean difference of PASI percent improvement from baseline to week 12 
between ABP 654 and ustekinumab arms with an equivalence margin of (-10, +10).  
3. 
Study Overview 
3.1 
Study Design 
This is a randomized, double-blind, active-controlled phase 3 study in adult subjects with 
moderate to severe plaque psoriasis.  This study is planned to be conducted globally at 
sites in North America and Europe.  
Approximately 542 adult subjects will be randomized (approximately 271 in the ABP 654 
group and approximately 271 in the ustekinumab group).  See Section 3.2 for sample 
size determination.  Randomization will be stratified based on prior biologic use for 
psoriasis (yes versus [vs] no (no more than 50% of the overall study population will have 
prior biologic use for psoriasis), baseline body weight (BW) (≤ 100 kg vs > 100 kg), and 
geographic region.  Subjects will be randomized (1:1) to Treatment Group A (ABP 654) 
or Treatment Group B (ustekinumab).  Subjects will receive ABP 654 or ustekinumab at 
a dose of 45 mg (baseline BW ≤ 100 kg) or 90 mg (baseline BW > 100 kg) administered 
subcutaneously (SC) on day 1 (week 0), week 4, and week 16.  The primary endpoint 
(PASI percent improvement from baseline to week 12) will be evaluated at week 12. 
At week 28, subjects who do not achieve a PASI 50 response or better improvement will 
be considered to have completed the study and will complete end of study procedures 
(i.e., week 52 procedures), and those unable to complete the week 28 visit, or do not 
have a PASI assessment completed, will be discontinued from the study (see Figure 1). 
Subjects with a PASI 75 response or better improvement will continue on the study and 
will be re-randomized in a blinded fashion such that subjects initially randomized to 
Group A (ABP 654) will continue to receive ABP 654 and those in Group B 
(ustekinumab) will re-randomized, using the same stratification factors as the original 
randomization, 1:1 to either continue on ustekinumab (Treatment Group B1) or switch to 
ABP 654 (Treatment Group B2).  Subjects will receive investigational product at week 28 
and the last dose of investigational product at week 40.  For subjects with PASI 50 
response or better but less than PASI 75 response at week 28, based on the 
Investigator’s discretion, the dose frequency may be increased to Q8W.  Subjects with 
baseline BW ≤ 100 kg will receive 45 mg Q8W and subjects > 100 kg at baseline will 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 12 of 39 
CONFIDENTIAL  
 
 
receive 90 mg Q8W at weeks 28, 36, and 44.  These subjects will continue on the 
originally assigned treatment with dose intensification and will not be 
rerandomized.  Subjects that do not dose intensify will be re-randomized.  
An external, independent data monitoring committee (DMC) will evaluate the safety data 
throughout the study. A SAP for the DMC will be prepared separately.   


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 13 of 39 
CONFIDENTIAL  
 
 
Figure 1 
Study Schematic 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 14 of 39 
CONFIDENTIAL  
 
 
3.2 
Sample Size 
Approximately 542 adult subjects will be randomized in a 1:1 ratio to receive 
investigational product (IP) (ABP 654 or ustekinumab) stratified by prior biologic use for 
psoriasis, geographic region, and baseline BW.  For the global primary analysis, the 
sample size will provide greater than 95 power to demonstrate equivalence at a 
significance level of 0.025 on the primary efficacy endpoint of PASI percent improvement 
from baseline to week 12 with an equivalence margin of (-15, +15), assuming a common 
standard deviation of 30.0 (Leonardi, 2008; Papp, 2008), a true mean difference of 0 in 
the primary efficacy endpoint between the 2 groups, and a 10 dropout rate. For the US 
primary analysis, the sample size will provide greater than 90 power to demonstrate 
equivalence at a significance level of 0.05 on the primary efficacy endpoint of PASI 
percent improvement from baseline to week 12 with an equivalence margin of (-10, +10), 
assuming a common standard deviation of 30.0, a true mean difference of 0 in the 
primary efficacy endpoint between the 2 groups, and a 10 dropout rate. 
3.3 
 Randomization 
Assignment to the treatment arms will be based on a computer-generated randomization 
schedule created before the start of the study. The randomization schedule will be 
generated using a permuted block design within each stratum. Interactive Voice/Web 
Response System (IXRS) data is integrated into the electronic data capture (EDC) 
system for subject enrollment.  
4. 
Covariates and Subgroups 
4.1 
Planned Covariates 
Unless stated otherwise, the following stratification factors will be adjusted as covariates 
in models or will be used to examine treatment effect in subgroups: 
 
Prior biologic use for psoriasis (yes vs. no) 
 
Baseline BW (≤ 100 kg vs. > 100 kg) 
 
Geographic region 
For continuous endpoints (e.g. PASI percent improvement from baseline, BSA change 
from baseline), the relevant baseline scores will be used as covariates in models. 
In addition, the following covariates may be used for further exploration in subgroups or 
as covariates: 
 
Age (< 65 years vs. ≥ 65 years) 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 15 of 39 
CONFIDENTIAL  
 
 
 
Race (White vs. Non-White) 
 
Gender 
 
Disease duration (< 1 year vs. ≥ 1 year) 
Covariate values may be discordant if collected via the case report form (CRF) and 
IXRS. Analyses that are intended to evaluate the treatment effect and include 
stratification variables as covariates in the model will be based on the CRF stratification 
values, regardless of the subject’s IXRS stratification values, to provide unbiased 
estimates of the effects of treatment and stratification variables without loss of efficiency 
(Ke et al, 2017). 
For subgroup analyses where the subgroup factor is a stratification variable, an analysis 
similar to the primary analysis (except the inclusion of the subgroup factor) should be 
done for each subgroup defined by the CRF values of the subgroup factor. 
4.2 
Subgroups 
Please refer to Section 4.1. 
5. 
Definitions 
5.1 
General 
 
Actual Treatment Received 
Defined as the type of IP (ABP 654 or ustekinumab) received for the majority of doses 
administered. In the case of a tie, the actual treatment received will be assigned to ABP 
654. For the Entire Study period, the actual treatment sequence for subjects who are re-
randomized and treated post re-randomization will be defined based on the actual 
treatments received during the through week 28 and post week 28 study periods (ABP 
654/ABP 654, ustekinumab/ustekinumab, or ustekinumab/ABP 654).  
Baseline 
Unless stated otherwise, the baseline is defined as the last non-missing assessment 
taken prior to or on the date of first dose of administration of IP.  In cases where baseline 
assessments are taken on the same day as the first dose of IP, and either no times are 
reported or the IP and assessment times are the same, it will be assumed that these 
assessments are taken prior to IP being administered. For subjects who are randomized 
but not dosed after the randomization, the baseline is defined as the last non-missing 
assessment prior to or on the date of randomization.   
Change from Baseline 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 16 of 39 
CONFIDENTIAL  
 
 
Change from baseline is defined as (value at post-baseline visit – value at baseline). A 
change from baseline will not be calculated if the baseline value is missing. 
Concomitant and Prior Medication 
Prior medications are defined as medications with a stop date prior to first dose of IP. 
Concomitant medications are defined as any medications ongoing at the start of IP 
treatment for the subject or with a start date on or after the first dose date. 
Disease Duration 
The disease duration is the number of years from the date of diagnosis of psoriasis to 
the date of randomization, which will be derived based on the table below. No imputation 
will be done for disease diagnosis date, but to avoid disease duration of zero, 1 month 
(or 1/12 years) may be added. 
Table 1: Calculation of the Duration of Psoriasis 
Observed 
portion 
Missing 
portion 
Formula to Calculate Duration  
Year, Month, 
Day
 
(Date of Randomization – Date of Psoriasis Diagnosis + 
1)/365.25 
Year, Month  
Day  
[Year(Date of Randomization) - Year(Date of Psoriasis 
Diagnosis)] + [Month(Date of Randomization) -
Month(Date of Psoriasis Diagnosis)]/12* 
Year 
Month, 
Day 
[Year(Date of Randomization) - Year(Date of Psoriasis 
Diagnosis)] *  
     *if the duration equals 0, add 1 month or 1/12 years. 
 
Dose Intensification 
A dose intensification subject is defined as a subject who has a PASI 50 response or 
better but less than PASI 75 response at week 28, and, based on the Investigator’s 
discretion, increases dose frequency to Q8W. These subjects continue on original 
assigned treatment with dose intensification and are not re-randomized. The dose 
intensification assignment will be derived directly from the “Does Subject Need Dose 
Intensification?” field on the CRF, and will not be re-derived based on actual dose 
received. 
End of Study (EOS) Date 
The EOS date is the date recorded on the End of Study page of the CRF. 
First Dose Date   
First Dose Date is defined as the date the subject receives the first dose of IP.  


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 17 of 39 
CONFIDENTIAL  
 
 
Last Dose Date   
Last Dose Date for the subject is the date the subject receives the last dose of IP.  
Last Observation Carried Forward (LOCF)   
A method of imputation where missing post-baseline data will be imputed by carrying 
forward the last non-missing post-baseline value for that endpoint.  Baseline values will 
not be carried forward. 
Non-Responder Imputation (NRI) 
A method of imputation where missing post-baseline binary response data will be 
imputed as non-responder, regardless of the reasons for missing data. 
Study Analysis Visit 
Since the actual visit for a subject may not exactly coincide with their scheduled visit 
date, the actual visit date is mapped to the study analysis visit as follows based on the 
type of data. 
If more than one actual visit (including the unscheduled visits) falls within the same 
defined window, the visit closest to the target day with non-missing data will be 
considered for analysis. If two actual visit dates are at the same distance from the target 
day, the later visit with non-missing data will be considered for analysis.  
For efficacy, PASI, sPGA, BSA: 
Study Analysis Visit  
Target Day  
Study Day  
Interval (days) 
Baseline
1  
≤1 
NA 
Week 4 
29
2-57
56 
Week 12 
85 
58-99 
42 
Week 16 
113
100-155 
56 
 
 
 
 
     Post week 28 Efficacy, for re-randomized subjects:               
Study Analysis Visit 
Target Day  
Study Day  
Interval (days)
Week 28 
197 
156-239 
84 
Week 40 
281
240-323 
84 
Week 52 
365 
≥324 
NA 
  
    Post week 28 Efficacy, for Dose Intensification subjects:               
Study Analysis Visit 
Target Day  
Study Day  
Interval (days)
Week 28 
197 
156-225 
70 
Week 36 
253
226-281 
56 
Week 44 
309 
282-337 
56 
Week 52 
365
≥338
NA 
 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 18 of 39 
CONFIDENTIAL  
 
 
For vital signs, safety laboratorya (including serum chemistry, hematology, 
urinalysis)   
Study Analysis Visit  
Target Day  
Study Day  
Interval (days) 
Baselineb 
1  
≤1 
NA 
Week 4 
29
2-57
56 
Week 12 
85 
58-99 
42 
Week 16 
113
100-155 
56 
                   
    Post week 28 Vital signs, safety laboratorya for re-randomized subjects:               
Study Analysis Visit 
Target Day  
Study Day  
Interval (days)
Week 28b
197
156-211 
56 
Week 32 
225 
212-253 
42 
Week 40 
281
254-323 
70 
Week 52 
365 
≥324 
NA 
     Post week 28 Vital signs, safety laboratorya for Dose Intensification subjects:               
Study Analysis Visit 
Target Day  
Study Day  
Interval (days)
Week 28b 
197 
156-211 
56 
Week 32 
225
212-239 
28 
Week 36 
253
240-281 
42 
Week 44 
309 
282-337 
56 
Week 52 
365
≥338
NA 
  
a Laboratory parameters will only be included at the visits where it is scheduled for 
assessment in the output tables. 
b If a subject has laboratory measurements on the same day as the first dose date at 
week 0 or week 28 but at a time after the first dose of IP at week 0 or week 28, 
respectively is administered, the laboratory measurements will not be defined as baseline 
or week 28, but will be included in consideration for week 4 or 32 measurements, 
respectively.  
 
The rules above for selecting a visit from multiple ones within the same visit window are 
not applicable to retest values of laboratory data. If the laboratory measurement is a 
retest, the retest value will be chosen. 
For anti-drug antibody (ADA), all subjects: 
Study Analysis Visit 
Target Day 
Study Day 
Baselinea 
1  
≤1  
by Week 4
29 
≤57
by Week 12 
85 
≤99 
    Post week 28 ADA, for re-randomized subjects: 
Study Analysis Visit 
Target Day 
Study Day 
by Week 28a
197
≤211 
by Week 32 
225 
≤253 
by Week 40
281
≤323 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 19 of 39 
CONFIDENTIAL  
 
 
by Week 52
365
NA
    Post week 28 ADA, for Dose Intensification subjects: 
Study Analysis Visit 
Target Day 
Study Day 
by Week 32
225
≤239 
by Week 52 
365 
NA 
a If a subject has ADA samples on the same day as the first dose date at week 0 or week 
28 but at a time after the first dose of IP at week 0 or week 28, respectively is 
administered, the ADA samples will not be defined as baseline or week 28, but will be 
included in consideration for week 4 or 32 samples, respectively.  
 
For PK, all subjects: 
Study Analysis Visit  
Target Day  
Study Day  
Interval (days) 
Baselinea 
1  
≤1 
NA 
Week 4 
29 
2-57 
56 
Week 12 
85
58-99
42 
 
 
     Post week 28 PK, for re-randomized subjects:               
Study Analysis Visit 
Target Day  
Study Day  
Interval (days)
Week 28a 
197 
156-211 
112 
Week 32 
225
212-253 
42 
Week 40 
281 
254-323 
70 
Week 52 
365
≥324
NA 
  
    Post week 28 PK, for Dose Intensification subjects:               
Study Analysis Visit  
Target Day  
Study Day  
Interval (days) 
Week 28a
197
156-211 
112
Week 32 
225 
212-239 
28 
Week 52 
365
≥338
NA 
a If a subject has PK measurements on the same day as the first dose date at week 0 or 
week 28 but at a time after the first dose of IP at week 0 or week 28, respectively is 
administered, the PK measurements will not be defined as baseline or week 28, but will 
be included in consideration for week 4 or 32 measurements, respectively.  
 
Study Day 
Study day is defined as the number of days from Study Day 1. 
 
Before Study Day 1: Study Day = (Date of assessment – Date of Study Day 1) 
 
On or After Study Day 1: Study Day = (Date of assessment – Date of Study Day 1)+1 
Therefore, the day prior to Study Day 1 is -1. 
Study Day 1 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 20 of 39 
CONFIDENTIAL  
 
 
Study Day 1 is defined as the first day the subject receives IP. For subjects who are 
randomized but not dosed after randomization, Study Day 1 is defined as the date of 
study randomization. 
Study Period 
 
Through week 12: 
It is defined as the time period from Study Day 1 to Study Day 99 or to the EOS visit for 
subjects who discontinue the study prior to the week 12 visit. 
 
Through week 28: 
It is defined as the time period from Study Day 1 to the first dose post re-randomization 
for re-randomized and treated subjects, or to the EOS visit for subjects not re-
randomized or for subjects who are re-randomized but not treated post re-
randomization, or to the first post (including) week 28 dose for subjects who dose 
intensify.     
 
Post week 28:  
For subjects who are re-randomized and treated post re-randomization, it is defined as 
the time period from the first dose post re-randomization to the EOS visit or analysis 
data cutoff date, whichever is earlier. For subjects who dose intensify, it is defined as the 
time period from the first post (including) week 28 dose to the EOS visit or analysis cutoff 
date, whichever is earlier.  Subjects who are re-randomized and treated post re-
randomization are classified according to their full treatment sequence: ABP 654/ABP 
654, ustekinumab/ustekinumab, or ustekinumab/ABP 654. Subjects who dose intensify 
are classified according to their post-week 28 treatment: ABP 654 or ustekinumab. 
 
Entire Study:  
It is defined as the time period throughout the study from Study Day 1 to the EOS visit or 
analysis data cutoff date, whichever is earlier. Subjects are re-randomized and treated 
post re-randomization are classified according to their full treatment sequence: ABP 
654/ABP 654, ustekinumab/ustekinumab, or ustekinumab/ABP 654. Subjects who dose 
intensify will not contribute to Entire Study summaries. 
Study Randomization 
Study randomization is defined as when subject initially receives a random treatment 
allocation via the IXRS system.   
Study Re-Randomization 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 21 of 39 
CONFIDENTIAL  
 
 
Study re-randomization is defined as when a subject receives a second random 
treatment allocation at week 28 via the IXRS system. In order to maintain the blind, 
subjects from both treatment arms will be re-randomized in a blinded fashion such that 
subjects initially randomized to Group A (ABP 654) will continue to receive ABP 654 and 
those in Group B (ustekinumab) will be re-randomized 1:1 to either continue on 
ustekinumab (Treatment Group B1) or switch to ABP 654 (Treatment Group B2). 
Total IP Exposure Duration 
The total IP exposure duration for a subject (in weeks) for each study period (through 
week 12, through week 28, post week 28, and Entire Study) will be derived as: the 
period end date for the subject – the period start date for the subject +1.  
The definitions for each study period are defined in section 5.1. 
5.2 
Efficacy 
Body Surface Area   
The percent of BSA affected (%BSA) is estimated by assuming that the subject’s palm, 
excluding the fingers and thumb, represents roughly 1% of the body’s surface 
(Chandran, 2009). At any given visit, BSA should be performed by the same assessor 
performing PASI assessment. Because of interobserver variability in estimated BSA, all 
assessments for a given subject should be made by the same observer whenever 
possible. 
PASI 
The PASI is a measure of the average redness (erythema), thickness (induration), and 
scaliness (scaling; each graded on a 0–4 scale of the lesions, weighted by the area of 
involvement (Feldman and Krueger, 2005). PASI combines the assessment of the 
severity of lesions and the area affected into a single score in the range 0 (no disease) 
to 72 (maximal disease). 
PASI Percent Improvement from Baseline 
PASI percent improvement from baseline is defined as 100 × (value at baseline – value 
at post-baseline visit) / value at baseline. A percent improvement will not be calculated if 
the baseline value is missing. A positive value will be considered PASI improvement. 
Hence, PASI percent improvement will be in a positive direction while PASI percent 
worsening will be in a negative direction. 
PASI Response  


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 22 of 39 
CONFIDENTIAL  
 
 
PASI Response is defined as a subject meeting or surpassing a pre-specified threshold 
for percent improvement in PASI score compared to the baseline PASI score. An 
improvement of at least 50% qualifies a subject as being a PASI 50 responder, an 
improvement of at least 75% qualifies a subject as being a PASI 75 responder, and an 
improvement of 100% qualifies a subject as being a PASI 100 responder. 
sPGA 
The sPGA is a 6-point scale (0-5) used to measure the severity of disease (induration, 
scaling, and erythema). The sPGA should be completed by the same assessor 
performing the PASI assessments.  All assessments for a given subject should be made 
by the same observer whenever possible. 
sPGA Response 
An sPGA response is defined as a subject meeting sPGA assessment values of 0 
(Clear) or 1 (Almost Clear). 
5.3 
Safety 
AE Leading to Discontinuation from IP/Study 
AEs leading to discontinuation from IP/study are those with an action taken with IP 
indicating “drug withdrawn” or Other action taken of “study discontinued”. 
Event of Interest (EOI) 
An EOI is defined as a noteworthy event for a particular product or class of products that 
a sponsor may wish to monitor carefully. It could be serious or non-serious and could 
include events that might be potential precursors or prodromes for more serious medical 
conditions in susceptible individuals (Council for International Organizations of Medical 
Sciences [CIOMS] VI, 2005). The EOIs for this study include:  
 
Serious systemic hypersensitivity reactions  
 
Facial palsy 
 
Pustular psoriasis 
 
Erythrodermic psoriasis  
 
Serious infections (including mycobacterial and salmonella infections) 
 
Malignancy 
 
Cardiovascular events 
 
Reversible posterior leukoencephalopathy syndrome 
 
Serious depression including suicidality 
 
Venous thromboembolism 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 23 of 39 
CONFIDENTIAL  
 
 
 
Additional adverse events (AE) may be identified as being of interest during the study 
and prior to the unblinding for the primary analysis.  
The detailed search strategies for the EOIs are included in Appendix 1. 
Laboratory Test Results 
In general, laboratory test results will be associated with the study period in which they 
are taken. However, laboratory test results taken on the same day as the first dose post 
re-randomization or post dose intensification, and before the first dose post re-
randomization or post dose intensification will be counted in the through week 28 period.     
Treatment-emergent Adverse Event  
Treatment-emergent adverse events (and serious TEAEs) are defined as those that 
occur on or after the time of first treatment up to EOS visit. 
A treatment-emergent AE (TEAE) for subjects is defined for each study period, when 
applicable. A TEAE for a given study period is defined as an AE that begins in the 
respective study period (see definition of Study Period in section 5.1).    
If the AE starts on the same day as the first dose of IP, then the flag indicating whether 
the AE started prior to the first dose on the adverse event CRF page will be used. For re-
randomized or dose intensified and treated subjects, an AE that starts on the same day 
as the first dose post re-randomization (or post dose intensification) will be considered 
as a TEAE post week 28. 
6. 
Analysis Sets 
6.1 
Full Analysis Set 
The Full Analysis Set (FAS) will include all randomized subjects.  It will be analyzed 
according to the treatment the subject is randomized to (regardless of actual treatment 
received). This analysis set will be the primary set used for analyses/summaries of the 
primary efficacy endpoint, as well as for all secondary efficacy endpoints. 
6.2 
Re-randomized Full Analysis Set 
The Re-randomized FAS will be a subset of the FAS who are re-randomized.  It will be 
analyzed according to the treatment sequence the subject is re-randomized to 
(regardless of actual treatment received). This analysis set will be the set used for 
analyses/summaries of efficacy for the Entire Study period. 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 24 of 39 
CONFIDENTIAL  
 
 
6.3 
Safety Analysis Set 
The Safety Analysis Set (SAS) will include all randomized subjects who receive at least 
one dose of IP. It will be analyzed according to actual treatment received.  This analysis 
set will be used for summaries of safety data as well as immunogenicity data and PK 
data. 
6.4 
Re-randomized Safety Analysis Set 
The Re-randomized Safety Analysis Set will be a subset of the SAS and will include all 
SAS subjects who are re-randomized and receive at least one dose of IP after re-
randomization.  It will be analyzed according to actual treatment sequence received prior 
to and post week 28.  This analysis set will be used for summaries of safety, 
immunogenicity, and PK data post week 28 and for the Entire Study period.     
6.5 
Per Protocol Set 
The Per Protocol (PP) Analysis Set will include all randomized subjects in the FAS who 
have completed dosing at Study Day 1 and week 4 and have completed PASI 
assessment at week 12 without experiencing an important protocol deviation that may 
affect their evaluation for the primary endpoint of the study. Important protocol deviations 
that could affect the primary endpoint will be defined and agreed upon before unblinding 
for the primary and final analyses. This analysis set will be used for sensitivity analyses 
for the primary and key secondary efficacy endpoints.  Analyses will be based on actual 
treatment the subject received. Note that per-visit analyses that use the PP Analysis Set 
will only be summarized for through week 12, which is the timepoint that the primary 
endpoint is evaluated at.  
7. 
Planned Analyses 
7.1 
Interim Analysis and Early Stopping Guidelines 
No interim analyses are planned for this study. 
7.2 
Primary Analysis 
The PA for the study will be performed when all randomized subjects reach week 32 or 
terminate early, and the analysis will comprise at least 32 weeks of efficacy, safety, 
immunogenicity, and PK data. 
All data collected by the time of data cut will be included in the PA. An independent 
unblinded team who are not involved in the operations of the study after PA database 
lock will perform the PA.  


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 25 of 39 
CONFIDENTIAL  
 
 
7.3 
Final Analysis 
The final analysis will be performed at the end of study when all randomized subjects 
reach the week 52 visit or terminate early from the study. 
8. 
Data Screening and Acceptance 
8.1 
General Principles 
The objective of the data screening is to assess the quantity, quality, and statistical 
characteristics of the data relative to the requirements of the planned analyses. 
The data review and cleaning process will be documented in a data management plan 
by Parexel and agreed by Amgen.  In addition to the data screening built into the Parexel 
Data Management Plan, the programming of analysis datasets, tables, figures and 
listings (TFL) provides additional data screening.  
When the database has been declared to be complete and accurate, the database will 
be locked.  Database lock will follow the standard operating procedure(s) at Parexel. 
8.2 
Data Handling and Electronic Transfer of Data 
Clinical data will be entered in RAVE database and exported as SAS® version 9.4 or 
higher datasets. Converted datasets will be created using SAS® and following standard 
Clinical Data Interchange Standards Consortium Standard Data Tabulation Model 
(CDISC SDTM, version 1.4, Implementation Guide version v3.2) conventions.  Analysis 
datasets will be created using SAS® and following CDISC Analysis Data Model (ADaM, 
version 2.1, Implementation Guide 1.1) standards. 
Medical history and AEs will be coded using the current version of Medical Dictionary for 
Regulatory Activities (MedDRA) at the time of the primary analysis to assign a system 
organ class (SOC) and preferred term (PT) to each event. Adverse events and abnormal 
laboratory results considered as AEs are assigned a toxicity grade according to National 
Cancer Institute (NCI-US) Common Terminology Criteria for Adverse Events (CTCAE) 
version 4.03. Prior and concomitant medications will be coded using the current version 
of the World Health Organization Drug Dictionary (WHO-DD) at the time of the primary 
analysis. 
8.3 
Handling of Missing and Incomplete Data 
The analysis of the primary efficacy endpoint will be performed in the FAS with missing 
post-baseline PASI scores imputed using LOCF. Any missing score (other than the 
baseline value) will be imputed using the score from the previous post baseline visit.  In 
addition, for the primary endpoint, a mixed model repeated measures analysis and 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 26 of 39 
CONFIDENTIAL  
 
 
tipping point analyses will be performed to explore the sensitivity of the results based on 
different assumptions for the missing data.  
Additionally, PASI 75 and PASI 100 response rates will be summarized at each 
scheduled timepoint via NRI in the FAS. 
Similar to PASI, missing post baseline BSA assessments will be imputed using LOCF, 
and missing post baseline sPGA assessments will be imputed using NRI. 
Missing safety, ADA and PK endpoints will not be imputed. 
Imputation for Partial or Missing Dates 
If dates are missing or incomplete for an AE (including deaths) or concomitant 
medication, the following algorithm will be used for imputation:  
Table 2:  Imputation Rules for Partial or Missing Start Dates 
Start Date 
Stop Date 
Complete: 
yyyymmdd 
Partial: yyyymm 
Partial: yyyy 
Missing 
<1st 
dose 
≥1st 
dose 
<1st 
dose 
yyyymm 
≥1st dose 
yyyymm 
<1st 
dose 
yyyy 
≥1st 
dose 
yyyy 
Partial: 
yyyym
m 
= 1st 
dose 
yyyymm 
2 
1 
n/a 
1 
n/a 
1 
1 
≠ 1st 
dose 
yyyymm 
2 
2 
2 
2 
2 
2 
Partial: 
yyyy 
= 1st 
dose 
yyyy 
3 
1 
3 
1 
n/a 
1 
1 
≠ 1st 
dose 
yyyy 
3 
3 
3 
3 
3 
Missing 
4 
1 
4 
1 
4 
1 
1 
1 = Impute as the date of first dose 
2 = Impute as the first of the month 
3 = Impute as January 1 of the year 
4 = Impute as January 1 of the stop year 
Note: If the start date imputation leads to a start date that is after the stop date, then 
there is a data error and do not impute the start date. 
Imputation rules for partial or missing stop dates: 
1. Initial imputation 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 27 of 39 
CONFIDENTIAL  
 
 
a. For partial stop date “mmyyyy”, impute the last of the month. 
b. For partial stop date “yyyy”, impute December 31 of the year. 
c. For completely missing stop date, do not impute. 
2. If the stop date imputation leads to a stop date that is after the death date, 
then impute the stop date as the death date. 
3. If the stop date imputation leads to a stop date that is before the start date, 
then there is a data error and do not impute the stop date. 
 
 
Imputation rules for partial or missing death dates: 
1. If death year and month are available but day is missing: 
a. If “mmyyyy” for last contact date = “mmyyyy” for death date, set death 
date to the day after the last contact date. 
b. If “mmyyyy” for last contact date < “mmyyyy” for death date, set death 
date to the first day of the death month. 
c. If “mmyyyy” for last contact date > “mmyyyy” for death date, data error 
and do not impute. 
2. If both month and day are missing for death date or a death date is totally 
missing, set death date to the day after the last contact date. 
 
The imputed dates will be used to assess whether AEs should be considered as 
treatment-emergent and if medications should be included in the safety summaries as 
prior or concomitant, however the original, partial dates will be included in data listings. 
8.4 
Validation of Statistical Analyses 
All statistical report outputs will be produced using SAS® version 9.4 or a higher version 
in a secure and validated environment. 
Programs will be developed and maintained and output will be verified in accordance 
with current standard operating procedures at Parexel.  The validation process is 
repeated any time TFLs are re-delivered with different data.  Execution of this validation 
process is documented throughout the study. The entire set of TFLs will be checked for 
completeness, accuracy prior to its delivery to Amgen. 
9. 
Statistical Methods of Analysis 
9.1 
General Considerations 
Unless otherwise specified, descriptive data summaries will be tabulated by treatment 
for all endpoints. Categorical data will be summarized using number of subjects, 
frequency and percentages of subjects falling into each category, with the denominator 
for percentages being the number of subjects in the analysis sets for each treatment 
group, unless otherwise noted. Percentages will be rounded to one decimal place except 
for 100%, which will have no decimal place. 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 28 of 39 
CONFIDENTIAL  
 
 
All continuous variables will be summarized using mean, standard deviation, median, 
minimum, maximum, 25th percentile (Q1), 75th percentile (Q3), and number of subjects 
with observations. The mean, median, Q1, and Q3 will be presented to one decimal 
place greater than the original data, standard deviation will be to two decimal places 
greater than the original data, and the minimum and maximum will have the same 
number of decimal places as the original data.  
CIs may also be provided (when specified). 
For any of the summaries that are to be done by visit, the derived analysis study visit as 
defined in Section 5.1 will be used for analysis unless otherwise noted. 
9.2 
Subject Accountability 
The following information will be summarized for subject disposition and accountability: 
 
Number of subjects randomized at the initial randomization (2 treatment groups) 
and re-randomization (3 treatment sequences) by geographic region, country, 
and site. 
 
Subject disposition before and after re-randomization (including number of 
subjects who are randomized, treated with ABP 654/ustekinumab, completed  
the week 28 visit, not re-randomized at week 28 with reasons for not re-
randomized, re-randomized at week 28, treated post week 28 re-randomization, 
completed study, and discontinued study with reasons for discontinuation) for 
each of the analysis sets defined in Section 6. Note that completed study will 
include PASI 50 non-responders who completed study at week 28 and subjects 
who completed study at week 52. 
 
Number of screened subjects and number of subjects in each analysis set by 
initial randomized treatment, and reasons for exclusion from each analysis set. 
 
Randomization list of subjects and their actual versus randomized and/or re-
randomized treatment groups for all randomized subjects. 
9.3 
Important Protocol Deviations 
Important Protocol Deviations (IPDs) data will be identified and recorded. The study 
team will conduct on-going reviews of the IPD data throughout the study and the 
resulting set of subjects to be included in the PP Analysis Set. The PP Analysis Set must 
be finalized prior to database lock of each analysis (PA and FA). 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 29 of 39 
CONFIDENTIAL  
 
 
A summary of incidence of IPDs will be tabulated using number and percentage of 
subjects by deviation type and initial randomized treatment through week 28 for the FAS 
and for the Entire Study for the Re-randomized FAS. In addition, the summary of 
incidence of IPDs will be generated for the subset of dose intensification subjects post 
week 28.  A listing of subjects with IPDs will be provided (with a flag indicating whether 
the deviation leads to exclusion from the PP Analysis Set). 
9.4 
Demographic and Baseline Characteristics 
The following demographics and baseline characteristics will be summarized by 
treatment for the FAS, PP Analysis Set, SAS, and Dose Intensified subjects, and by 
treatment sequence for the subjects in the Re-randomized FAS, and the Re-randomized 
SAS:  
 
age (in years, at time of signing informed consent form (ICF)) and age category (< 
65 vs ≥ 65),  
 
race,  
 
sex,  
 
ethnicity,  
 
height,  
 
weight,  
 
body mass index (BMI),  
 
geographic region, 
 
prior biologic use for psoriasis  
 
prior topical steroid use 
 
disease duration (< 1 year vs. ≥ 1 year) 
 
baseline PASI 
 
baseline sPGA 
 
baseline BSA  
 
9.5 
Efficacy Analyses 
9.5.1 
Analyses of Primary Efficacy Endpoint 
The primary efficacy endpoint is the PASI percent improvement from baseline to week 
12. 
9.5.1.1 
Primary Analysis  
The primary analysis will be performed using the FAS based on the randomized 
treatment and LOCF data. 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 30 of 39 
CONFIDENTIAL  
 
 
Analysis will assess the hypothesis that there are no clinically meaningful differences 
between ABP 654 and ustekinumab treatment arms in PASI percent improvement from 
baseline to week 12. 
Clinical equivalence of the primary endpoint will be evaluated by comparing the 2-sided 
90 CI of the mean difference of PASI percent improvement from baseline to week 12 
between ABP 654 versus ustekinumab with equivalence margin of (-10, +10).  If the 2-
sided 90% CI is within the pre-specified global equivalence margin (-10, +10), then it is 
declared that ABP 654 and ustekinumab is clinically similar. The point estimate of the 
mean difference in PASI percent improvement from baseline to week 12 between ABP 
654 and ustekinumab and its corresponding 2-sided 90% CI will be obtained from an 
Analysis of Covariance (ANCOVA) model with treatment, baseline PASI value, and the 
stratification factors of baseline BW, prior biologic use, and region as covariates. 
Regions with small number of subjects in them will be combined.   
9.5.1.2 
Sensitivity Analyses 
To assess the robustness of the primary analysis result, the ANCOVA analysis 
described above will be repeated using the FAS and also on the PP Analysis Set based 
on observed data. 
In addition, a repeated-measures analysis based on the FAS will be performed as a 
sensitivity analysis. Besides the stratification factor of region, the baseline PASI value, 
visit, treatment, and treatment-by-visit interaction will be included in the model, with visit 
as a categorical variable. The point estimate of the mean difference in PASI percent 
improvement from baseline to week 12 between ABP 654 and ustekinumab and its 
corresponding 2-sided 90% CI will be obtained. The mixed model repeated measures 
analysis will be implemented using PROC MIXED and a compound symmetry 
covariance structure in SAS®.   
Another sensitivity analysis based on the FAS will be done to explore the impact of the 
baseline covariates in section 9.4 on mean difference in PASI percent improvement from 
baseline to week 12 in addition to the stratification factors of baseline BW, prior biologic 
use, region and the baseline PASI value. The LOCF data will be used in this analysis. A 
stepwise model selection (with <0.25 p-value to enter the model and <0.1 to stay in the 
model) will be fit using PROC GLM and will be used to determine if any of the covariates 
have significant impact on the outcome variable. The final ANCOVA model will be fit 
using PROC GLM and will maintain treatment, the stratification factors of baseline BW, 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 31 of 39 
CONFIDENTIAL  
 
 
prior biologic use, region, the baseline PASI value, and the covariates identified by the 
stepwise model.  
In addition, the mean difference in the PASI percent improvement from baseline to week 
12 between the two group will be examined in the subgroups as defined by the 
covariates in Section 4.1. These additional explorations will be performed on the FAS by 
using the ANCOVA analysis on LOCF data. 
The rate of missing PASI assessments at week 12 will be tabulated with reasons, such 
as missing baseline, outside of the defined week 12 analysis time frame (study day 58-
99) and discontinued from the study early prior to week 12.  Discontinuations from the 
study prior to week 12 will be further broken down by reasons on the EOS CRF page. 
Tipping point analyses will be performed using the FAS to explore the sensitivity of 
LOCF primary analysis results to violations in assumptions about the missing data (i.e., 
to various MCAR and missing at random (MAR) assumptions).  Assumptions under 
which the 90% CI no longer rules out unacceptable differences in efficacy as determined 
by PASI percent improvement from baseline to week 12 between ABP 654 and 
ustekinumab will be identified.  
In this analysis, all the observed data will be included as non-missing. The analysis will 
be performed using a general three-step approach: 
(1) Multiple imputation will be done using PROC MI to generate 20 imputed datasets by 
imputing missing data assuming monotone missing pattern and that subjects with 
missing data have, on average, worse or better efficacy compared to those who have 
values. The mean difference between the (unobserved) missing values and observed 
values (refer to as shift) can vary independently for the different treatment groups. 
(2) Each of these imputed datasets (which contains identical values of non-missing data, 
but different values imputed for missing data) is analyzed using standard SAS® 
procedure, e.g., PROC GLM. 
(3) Results from all imputed datasets are then combined together for overall inference 
using PROC MIANALYZE.  
For PASI percent improvement from baseline to week 12, seven equally spaced shifts 
(e.g., -15 to 15 by 5) for the PASI percent improvement from baseline for subjects with 
missing data will be explored. 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 32 of 39 
CONFIDENTIAL  
 
 
Sensitivity analyses may be performed for the situation where a subject is re-randomized 
via IXRS based on an incorrect PASI percent improvement at week 28 calculated by the 
site (i.e. the improvement percentage is too low, and they are still re-randomized). 
Should this occur in greater than 10 subjects, the following efficacy and safety analyses 
that use the Re-randomized FAS and Re-randomized SAS will be regenerated only 
using the group of subjects that are correctly re-randomized: observed PASI percent 
improvement from baseline post week 28, observed PASI 75 and PASI 100 response 
rates post week 28, observed sPGA response rates post week 28, observed BSA 
change from baseline post week 28, and the overall summary of TEAEs post week 28. 
9.5.1.3 
Impact of COVID-19 on missing data 
The COVID-19 global pandemic could have a profound impact on the amount and 
pattern of missing primary efficacy results for various reasons, e.g.: 
 
Exorbitant amount of missing endpoint data due to infection 
 
Extended site closures / Inability to obtain an assessment 
 
Lack of drug supply 
These can reasonably be treated as missing completely at random (MCAR), and hence 
are not expected to introduce bias.  
9.5.2 
Analyses of Secondary Efficacy Endpoint(s) 
All secondary efficacy endpoints will be analyzed descriptively. 
Analyses for secondary efficacy endpoints will be provided by visit from Study Day 1 to 
EOS. In general, treatment comparison of interest for timepoints prior to re-
randomization (week 28 included) include the comparison between treatment ABP 654 
and ustekinumab; treatment comparison of interest for timepoints post re-randomization 
(week 28) include the comparison between treatment sequence ABP 654/ABP 654 and 
ustekinumab/ustekinumab and the comparison between treatment sequence 
ustekinumab/ABP 654 and ustekinumab/ustekinumab. For timepoints post week 28 for 
subjects who dose intensify, the treatment comparison is between ABP 654 and 
ustekinumab. Separate analyses will be presented for re-randomized subjects and 
subjects who dose intensify. Strata with small number of subjects in them will be 
combined. 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 33 of 39 
CONFIDENTIAL  
 
 
9.5.2.1 
PASI percent improvement from baseline at other timepoints  
PASI percent improvement from baseline at other timepoints will be summarized by 
scheduled visit and will be analyzed based on LOCF in the FAS and Re-randomized 
FAS and as observed in the FAS and Re-randomized FAS and PP Analysis Sets.  PASI 
percent improvement from baseline will only be summarized at week 4 for the PP 
Analysis Set.  Additionally, observed PASI percent improvement from baseline post 
week 28 will be summarized separately for subjects who dose intensify.  The LS mean 
differences and 90% CIs of PASI percent improvement from baseline between the 
treatment arms to other scheduled visits will be estimated using separate ANCOVA 
models similar to that used for the primary efficacy endpoint. 
9.5.2.2 
PASI 75 and PASI 100 response throughout the study  
PASI 75 and PASI 100 response will be summarized by frequency and percentage of 
subjects at each scheduled timepoint via NRI in the FAS and re-randomized FAS and as 
observed in the FAS and re-randomized FAS and PP Analysis Sets. PASI 75 and PASI 
100 response will only be summarized at weeks 4 and 12 for the PP Analysis Set. 
Additionally, PASI 75 and PASI 100 observed response rates post week 28 will be 
summarized separately for subjects who dose intensify.  
Generalized linear models adjusted for the stratification factors with an identity link will 
be used to obtain the point estimate and 90% CI for the risk difference of PASI 75 and 
PASI 100 response rate at each scheduled timepoint. 
9.5.2.3 
sPGA responses at week 12 and week 52 
sPGA response (0/1) rates will be summarized at each scheduled timepoint via NRI in 
the FAS and Re-randomized FAS and as observed in the FAS and Re-randomized FAS 
and PP Analysis Sets. sPGA response rates will only be summarized at week 12 for the 
PP Analysis Set.  Additionally, observed sPGA response rates post week 28 will be 
summarized separately for subjects who dose intensify. 
Separate generalized linear models adjusted for the stratification factors with an identity 
link will be used to obtain the point estimate and 90% CI for the risk difference of sPGA 
response rate at week 12 and week 52. 
9.5.2.4 
BSA change from baseline at week 12 and week 52 
BSA change from baseline at week 12 and week 52 will be analyzed using an ANCOVA 
model, similar to the primary efficacy endpoint in the FAS and Re-randomized FAS and 
as observed in the FAS and Re-randomized FAS and PP Analysis Sets. BSA change 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 34 of 39 
CONFIDENTIAL  
 
 
from baseline will only be summarized at week 12 for the PP Analysis Set.  Additionally, 
observed BSA change from baseline post week 28 will be summarized separately for 
subjects who dose intensify.  The point estimate of the mean difference in change from 
baseline in BSA at week 12 and week 52 between the treatment arms and its 
corresponding 2-sided 90% CI will be obtained from an ANCOVA model with treatment, 
baseline BSA value, and the stratification factors of baseline BW, prior biologic use, and 
region as covariates. Separate ANCOVA models will be fit for each timepoint. 
9.6 
Safety Analyses 
All safety analyses will be performed on the SAS based on actual treatment received or 
Re-randomized SAS based on actual treatment sequence received (see definitions of 
actual treatment in Section 5.1).  
Safety summaries will be provided separately as follows:  
 
Through week 12 period for the actual treatment groups: ABP 654 or 
ustekinumab 
 
Through week 28 period for the actual treatment groups: ABP 654 or 
ustekinumab. 
 
Post week 28 period for the actual treatment sequence for subjects who are re-
randomized and treated post re-randomization: ABP 654/ABP 654, 
ustekinumab/ustekinumab, or ustekinumab/ABP 654. 
 
Post week 28 period for the actual treatment groups for subjects who receive 
intensive dosing: ABP 654 or ustekinumab. 
 
Entire Study period for the actual treatment sequence: ABP 654/ABP 654, 
ustekinumab/ustekinumab, or ustekinumab/ABP 654. Note that the safety 
summaries for the Entire Study period exclude subjects who dose intensify. 
The definitions for each study period are provided in Section 5.1. 
9.6.1 
Adverse Events 
All reported AEs will be coded to the appropriate SOC and PT according to the most 
current version of MedDRA at the time of the primary analysis, and the severity of each 
AE will be graded by the investigator per CTCAE v4.03 criteria. 
For summary of AEs the following AE summaries, (a) through (h), will be provided by 
treatment for each study period of through week 12, through week 28, and post week 28. 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 35 of 39 
CONFIDENTIAL  
 
 
In addition, summaries (a) and (c) will be provided for the Entire Study period, and 
summary (a) will be provided for post week 28 for subjects who dose intensify. 
(a) overall summary of treatment-emergent AEs, 
(b) treatment-emergent AEs by SOC, PT, and maximum severity grade, 
(c) treatment-emergent AEs by SOC and PT, 
(d) overall summary of treatment-emergent EOIs (with risk difference), 
(e) treatment-emergent AEs by PT, 
(f) grade 3 or higher treatment-emergent AEs by PT, 
(g) treatment-emergent AEs leading to discontinuation from IP/study by PT, 
(h) treatment-emergent EOIs by PT  
 
Counting of AEs will be by subject, and subjects will be counted only once within each 
SOC or PT by study period. For tables categorized by severity, subjects with multiple 
events within a particular SOC or preferred term will be counted under the category of 
their most severe event with that SOC or preferred term.  
AEs tabulated by preferred term will be presented in descending order of frequency in 
the ABP 654 arm or the ABP 654/ABP 654 arm when appropriate. 
The risk difference and 90% CI of each EOI ((d) above) through week 12, through week 
28 and post week 28 will be calculated on the SAS or re-randomized SAS using Wald 
asymptotic confidence limits or exact confidence limits if the number of subjects for any 
treatment is less than 25. 
9.6.2 Deaths and Serious Adverse Events 
Subject incidence of the following will be tabulated for study period: through week 12, 
through week 28, post week 28, and Entire Study period: 
(i) serious treatment-emergent AEs by SOC and PT, 
(j) serious treatment-emergent AEs by PT,  
(k) treatment-emergent fatal AEs by PT. 
Summaries will be sorted in descending order of frequency in the ABP 654 arm or ABP 
654/ABP654, when applicable.   
A listing of treatment-emergent serious AE for the Entire Study period will be provided.   


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 36 of 39 
CONFIDENTIAL  
 
 
9.6.3 
Laboratory Test Results 
Laboratory data (hematology, serum chemistry, and urinalysis) will be converted to 
Système International units for reporting and processing purposes.  Absolute values and 
changes from baseline by visit will be presented descriptively for through week 28 and 
Entire Study periods (refer to study period definition in section 5.1). Shift tables of the 
worst on-study laboratory toxicity based on CTCAE grading relative to baseline will be 
presented by study period.  There is no categorization for re-baseline for post week 28 
analyses.    
The shift tables will take into account all post-baseline (schedule and unscheduled) 
laboratory results in the determination of the worst on-study laboratory toxicity for 
parameters that have CTCAE criteria. In addition, subject incidence tables of grade ≥ 3 
laboratory toxicities will be provided. Standard ranges will be used for the laboratory 
analysis. 
Protocol-required laboratory assessments will be grouped for summary as follows: 
Hematology:  hemoglobin, hematocrit, red blood cells, platelets, total white blood cell 
(WBC) count, differential WBC count, and absolute neutrophil count 
Biochemistry:  albumin, alkaline phosphatase, alanine aminotransferase (ALT), 
amylase, aspartate aminotransferase (AST), blood urea nitrogen (BUN), creatinine, 
gamma glutamyltransferase, glucose (random), potassium, sodium, total protein, and 
total bilirubin 
Urinalysis:  pH, specific gravity, creatinine, glucose, bilirubin, blood, and protein 
9.6.4 
Vital Signs 
Observed and change from baseline for each vital sign parameter will be summarized 
descriptively by visit for through week 28 and the Entire Study periods (refer to study 
period definition in section 5.1).    
9.6.5 
Physical Examinations 
None. 
9.6.6 
Immunogenicity 
The number and percentage of subjects developing binding ADAs and those developing 
neutralizing antibodies will be tabulated by visit and actual treatment received using the 
SAS and actual treatment sequence received using the Re-randomized SAS.   


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 37 of 39 
CONFIDENTIAL  
 
 
Developing antibody incidence through week 28 and through EOS is defined as the 
number of subjects with a negative or no antibody result at baseline and a positive 
antibody result at a post-baseline visit divided by the number of subjects with at least 
one post baseline result within the respective study period. Treatment boosted antibody 
result is defined as a binding antibody positive at baseline with a > 4x increase in 
magnitude (reflected by S/N value) post-baseline within the respective study period. A 
transient antibody result is defined as a positive post-baseline result with a negative 
result at the subject’s last visit tested within the respective study period (refer to 
definition of ADA study visit in section 5.1). 
Developing antibody incidence in the post week 28 period is evaluated among subjects 
who are treated post re-randomization.  It is defined as number of subjects who have a 
positive result post re-randomization, have never tested positive (i.e., negative or no 
results) prior to the first dose in post week 28 period, divided by the number of subjects 
who have at least a result post re-randomization in the study period. Additionally, 
developing antibody incidence will be summarized for subjects who dose intensify post 
week 28 according to actual treatment received.  
9.6.7 
Exposure to Investigational Product 
IP exposure (ABP 654 or ustekinumab) will be tabulated separately through week 12 
and through week 28 using the SAS according to the actual treatment received, and post 
week 28 using the Re-randomized SAS according to the actual treatment sequence 
received. Subjects who dose intensify will be summarized post week 28 according to 
actual treatment received. Summary statistics will be provided for the total number of 
doses administered, total dose received, and total duration of IP exposure by the 
different study periods specified for the safety analyses in section 9.6.1.  
A subject listing of each administered lot number(s) for IP and a listing of unique 
manufacturing lot numbers used in the study will be provided by subject. 
9.6.8 
Prior and Concomitant Medications 
Prior and concomitant medications will be coded using the World Health Organization-
Drug Dictionary (WHO-DD) and will be summarized by preferred name. The prior 
medications will be summarized by initial treatment the subject received. The 
concomitant medications will be summarized for the different study periods specified for 
the safety analyses in section 9.6.1 using SAS or the Re-randomized SAS.  


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 38 of 39 
CONFIDENTIAL  
 
 
The number and percentage of subjects using each medication will be displayed by 
treatment arm. Subjects taking more than one medication in the same preferred name 
will be counted once for the number of subjects taking that preferred name.  
9.7 
Other Analyses 
9.7.1 
Analyses of Pharmacokinetic Endpoints 
Serum ABP 654 and ustekinumab concentrations from PK sampling will be summarized 
descriptively for each visit through week 28 for the SAS and post week 28 for both the 
Re-randomized SAS and the subjects who dose intensify.  Boxplots for trough serum 
ABP 654 and ustekinumab concentrations will be generated for each visit through week 
28 for the SAS and post week 28 for both the Re-randomized SAS and the subjects who 
dose intensify.   
9.7.2 
Analyses of Clinical Outcome Assessments 
None. 
9.7.3 
Analyses of Health Economic Endpoints 
None. 
9.7.4 
Analyses of Biomarker Endpoints 
None. 
10. 
Changes From Protocol-specified Analyses 
There are no changes to the protocol-specified analyses. 
11. 
Literature Citations / References 
1. Feldman SR, Krueger GG. Psoriasis Assessment Tools in Clinical Trials. Ann 
Rheum Dis. 2005;64 suppl 2(Suppl2):ii65-ii68;discussion ii69-ii73. 
doi 10.1136/ard.2004.031237 
 
2. Ke C, Wang J, Zhang C, Jiang Q, Snapinn S. On errors in stratified 
randomization. Statistics in Biopharmaceutical Research 2017; 9 (2): 225-33. 
3. US FDA.  Guidance for Industry:  Scientific considerations in demonstrating 
biosimilarity to a reference product.  April 2015a, US FDA. 


Product:  ABP 654  
Protocol Number:  20190232 
Date:  08 September  2020 
Page 39 of 39 
CONFIDENTIAL  
 
 
Appendix 1 List of Events of Interest and the Associated SMQ and EOI Searching 
Strategies 
 
Event of Interest 
Category of EOI query 
(SOC, SMQ / Amgen query)  
Search Strategy 
Serious systemic hypersensitivity 
reactions 
Hypersensitivity (SMQ) 
Broad – CTCAE 
grade ≥3 or the 
serious TEAE terms 
with cut-off period 
up to 2 days after IP 
administration 
Facial palsy 
Facial paralysis 
PT 
Pustular psoriasis 
Pustular psoriasis 
PT 
Erythrodermic psoriasis 
Erythrodermic psoriasis 
PT 
Serious infections (including 
mycobacterial and salmonella 
infections) 
Infections and Infestations 
(SOC)  
CTCAE grade >=3 or t
serious TEAE terms 
Malignancy 
Malignancies (SMQ) 
Narrow 
Cardiovascular events 
Cardiac disorders (SOC) 
SOC 
Reversible posterior 
leukoencephalopathy syndrome  
Posterior reversible 
encephalopathy 
syndrome/reversible 
posterior 
leukoencephalopathy 
syndrome (Amgen query)  
Narrow 
Serious depression including 
suicidality 
Depression and suicide/self-
injury (SMQ) 
CTCAE grade >=3 
or the serious 
TEAE terms 
Venous thromboembolism 
Embolic and thrombotic 
events, venous (SMQ) 
 
Narrow