Clinical trial NCT03342404
Conditions: Thalassemia
Keywords: (β)-Thalassemia Beta-Thalassemia Phase 2 Luspatercept ACE-536 Safety Efficacy Placebo Red Blood Cell Transfusions Erythrocyte transfusion Hb increase NTDT
Sponsor: Celgene
Start date: 2018-02-05; Completion date: 2022-11-28
Enrollment: 145 participants; Allocation: RANDOMIZED; Intervention model: PARALLEL

Brief summary:
This is a Phase 2, double-blind, randomized, placebo-controlled, multicenter study to determine the efficacy and safety of luspatercept (ACE-536) versus placebo in adults with non-transfusion dependent beta (β)-thalassemia. The study is divided into the Screening Period, Double-blind Treatment Period (DBTP), Open-label Phase (OLP), and Post-Treatment Follow-up Period (PTFP).

It is planned to randomize approximately 150 subjects at a 2:1 ratio of luspatercept versus placebo.

Detailed description:
The primary objective is:

\- To evaluate the effect of luspatercept (BMS-986346) versus placebo on anemia, as measured by mean hemoglobin concentration in the absence of transfusions over a continuous 12-week interval, from Week 13 to Week 24, compared to baseline.

The secondary objectives are:

* To evaluate the effect of luspatercept versus placebo in anemia-related symptoms in participants with β-thalassemia, as measured by non-transfusion dependent β-thalassemia-patient reported outcome (NTDT-PRO) over continuous 12-week intervals (from Weeks 13 to 24 and from Weeks 37 to 48) compared to baseline.
* To evaluate the effect of luspatercept versus placebo on functional and health-related quality of life (QoL) as measured by Medical Outcomes Study 36-Item Short Form (SF-36) and Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-F) questionnaires
* To evaluate the long-term effect of luspatercept versus placebo on anemia, as measured by mean hemoglobin concentration in the absence of transfusions over a continuous 12-week interval from Week 37 to Week 48, compared to baseline
* To evaluate the effect of luspatercept versus placebo on iron overload, as measured by liver iron concentration (LIC) and iron chelation therapy (ICT) daily dose
* To evaluate the effect of luspatercept versus placebo on iron overload, as measured by serum ferritin
* To evaluate the duration of erythroid response
* To evaluate the effect of luspatercept versus placebo on physical activity measured by 6-minute walk test (6MWT)

Safety and Pharmacokinetics (PK) Objectives

* To evaluate safety and tolerability of luspatercept, including immunogenicity
* To evaluate population pharmacokinetics (PK) of luspatercept in subjects with β-thalassemia

The exploratory objectives are:

* To evaluate the effect of luspatercept versus placebo on measures of extra-medullary hematopoietic (EMH) masses, bone mineral density, splenomegaly, pulmonary hypertension, and leg ulcers, when present
* To evaluate the effect of luspatercept versus placebo on the β-thalassemia severity as measured by the NTDT severity score system
* To evaluate the effect of luspatercept versus placebo on the β-thalassemia severity as measured by the Morbidity-free Survival parameters
* To examine the relationship of baseline and change in serum Growth Differentiation Factor 11 (GDF11) and other related biomarkers with response to treatment with luspatercept
* To examine the effect of luspatercept on fetal hemoglobin (HbF)
* To examine the effect of luspatercept on Health Resource Utilization (HRU)

Arms: arm 1: Arm Description: Luspatercept, subcutaneous(ly) (SC) once every 21 days arm 2: normal saline solution subcutaneous(ly) (SC) once every 21 days
Interventions: intervention 1: Luspatercept intervention 2: Placebo intervention 3: Best Supportive Care (BSC)
Intervention descriptions: intervention 1: Subjects will start with luspatercept at 1 mg/kg dose level every 3 weeks and can be dose escalated up to 1.25 mg/kg. intervention 2: Placebo, Subcutaneous, every 21 days intervention 3: Best Supportive Care (BSC)

Protocol documents:
Prot_000.pdf: 
EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
1
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
TITLE PAGE
A PHASE 2, DOUBLE-BLIND, RANDOMIZED, 
PLACEBO-CONTROLLED, MULTICENTER STUDY TO 
DETERMINE THE EFFICACY AND SAFETY OF 
LUSPATERCEPT (ACE-536) VERSUS PLACEBO IN 
ADULTS WITH NON-TRANSFUSION DEPENDENT 
BETA ()-THALASSEMIA
(The BEYOND™ Study)
PROTOCOL NUMBER:
ACE-536-B-THAL-002
DATE FINAL:
12 MAY 2017
DATE AMENDMENT 1 FINAL:
21 DEC 2018
DATE AMENDMENT 2 FINAL:
12 Jun 2020
EudraCT NUMBER:
2015-003225-33
IND NUMBER:
112562
SPONSOR NAME/ ADDRESS:
Celgene Corporation
CONFIDENTIAL
This protocol is provided to you as an Investigator, potential Investigator, or 
consultant for review by you, your staff, and ethics committee/institutional 
review board. The information contained in this document is regarded as 
confidential and, except to the extent necessary to obtain informed consent, 
may not be disclosed to another party unless such disclosure is required by 
law or regulations. Persons to whom the information is disclosed must be 
informed that the information is confidential and may not be further 
disclosed by them.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
2
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
MEDICAL MONITOR / EMERGENCY CONTACT INFORMATION 
Contact Information:
Name: Jeevan Shetty, MBChB, FRCP
Title: Medical Director, Clinical Development
Note: The back-up 24-hour global emergency contact call center should only be used if you 
are not able to reach the Clinical Research Physician(s) or Medical Monitor or designee for 
emergency calls.
Back-up 24-hour Global Emergency Contact Call Center: 


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
3
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
CELGENE THERAPEUTIC AREA HEAD SIGNATURE PAGE
{See appended electronic signature page}
Signature of Celgene Therapeutic Area Head
dd mmm yyyy
Printed Name of Celgene Therapeutic Area Head and Title
By my signature, I indicate I have reviewed this protocol and find its content to be 
acceptable.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
4
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
SITE PRINCIPAL INVESTIGATOR SIGNATURE PAGE
Signature of Site Principal Investigator
dd mmm yyyy
Printed Name of Site Principal Investigator
Institution Name: _______________________________________
By my signature, I agree to personally supervise the conduct of this study at my study 
site and to ensure its conduct is in compliance with the protocol, informed consent, 
Institutional Review Board (IRB)/Ethics Committee (EC) procedures, instructions from 
Celgene representatives, the Declaration of Helsinki, International Council for 
Harmonisation (ICH) Good Clinical Practices Guidelines, and local regulations 
governing the conduct of clinical studies.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
5
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
COORDINATING PRINCIPAL INVESTIGATOR SIGNATURE PAGE
Signature of Coordinating Principal Investigator
dd mmm yyyy
Printed Name of Coordinating Principal Investigator
Institution Name: _______________________________________
By my signature, I agree the protocol has been written to comply with ICH Good 
Clinical Practices guidelines and agree to offer guidance throughout the study as 
needed.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
6
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
PROTOCOL SUMMARY
Study Title
A Phase 2, Double-blind, Randomized, Placebo-controlled Multicenter Study to Determine the 
Efficacy and Safety of Luspatercept (ACE-536) versus Placebo in Adults with Non-transfusion 
Dependent Beta ()-Thalassemia 
Indication
Adults with non-transfusion dependent β-thalassemia (NTDT)
Objectives
The primary objective is:

To evaluate the effect of luspatercept versus placebo on anemia, as measured by mean 
hemoglobin concentration in the absence of transfusions over a continuous 12-week 
interval, from Week 13 to Week 24, compared to baseline.
The secondary objectives are:

To evaluate the effect of luspatercept versus placebo in anemia-related symptoms in 
patients with β-thalassemia, as measured by non-transfusion dependent 
β-thalassemia-patient reported outcome (NTDT-PRO) over continuous 12-week 
intervals (from Weeks 13 to 24 and from Weeks 37 to 48) compared to baseline

To evaluate the effect of luspatercept versus placebo on functional and health-related
quality of life (QoL) as measured by the Medical Outcomes Study 36-Item Short 
Form (SF-36) and Functional Assessment of Chronic Illness Therapy-Fatigue
(FACIT-F) questionnaires

To evaluate the long-term effect of luspatercept versus placebo on anemia, as 
measured by mean hemoglobin concentration in the absence of transfusions over a 
continuous 12-week interval from Week 37 to Week 48, compared to baseline

To evaluate the effect of luspatercept versus placebo on iron overload, as measured 
by liver iron concentration (LIC) and iron chelation therapy (ICT) daily dose 

To evaluate the effect of luspatercept versus placebo on iron overload, as measured 
by serum ferritin

To evaluate the duration of erythroid response

To evaluate the effect of luspatercept versus placebo on physical activity measured by 
6-minute walk test (6MWT)
Safety and Pharmacokinetics (PK) Objectives

To evaluate safety and tolerability of luspatercept, including immunogenicity

To evaluate population pharmacokinetics (PK) of luspatercept in subjects with -
thalassemia


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
7
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
 
 
 
 
 
 
 
Study Design
This is a Phase 2, double-blind, randomized, placebo-controlled, multicenter study to determine 
the efficacy and safety of luspatercept (ACE-536) versus placebo in adults with non-transfusion
dependent beta ()-thalassemia. The study is divided into the Screening Period, Double-blind 
Treatment Period (DBTP), Open-label Phase (OLP) and Post-treatment Follow-up Period 
(PTFP). The overall study design is described in Figure 7.
The study will be conducted in compliance with International Council for Harmonisation (ICH) 
Good Clinical Practices (GCPs).
Study Population
Subjects diagnosed with NTDT, with a documented diagnosis of β-thalassemia or hemoglobin 
E/β-thalassemia, aged ≥18 years and who received 0 to 5 units of red blood cells (RBCs) during 
the 24-week period prior to randomization, with a mean baseline hemoglobin level ≤10.0 g/dL.
A total of approximately 150 eligible subjects will be enrolled.
Length of Study
Study participation for each individual subject will be approximately 4 weeks in the 
Screening Period, at least 48 weeks in the DBTP, up to 15 months in the Open-label Phase 
(OLP) and the PTFP will be for 5 years from first dose of IP, or 3 years from last dose 
(whichever occurs later) to complete the Post-treatment Follow-up Period under this study or the 
rollover protocol.
End of Treatment for each individual subject is defined as the date of the last IP dose in the
DBTP or OLP, whichever occurs later.
End of Study for each individual subject should occur after the study is unblinded and the 
OLP, or the PTFP have been completed, as appropriate or at the End of Trial as defined below,
whichever occurs later.
The End of Trial is defined as the date all subjects complete the OLP, if eligible (see 
Section 3.1.3), or discontinue earlier, or the date of receipt of the last data point from the last 
subject that is required for primary, secondary, and/or exploratory analysis as prespecified in the 
protocol, whichever is the later date.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
8
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
The Sponsor may end the trial when all key endpoints and objectives of the study have been 
analyzed, and the availability of a rollover protocol exists.
Any subjects remaining on the parent study may be consented and continue to receive access to 
luspatercept, and/or complete the long-term follow-up of 5 years from first dose of IP, or 3 years 
from last dose (whichever occurs later), to complete the Post-treatment Follow-up Period under 
this study or the rollover protocol.
Study Treatments
Experimental arm. Luspatercept will be provided by the Sponsor as a lyophilized powder in 
vial. Luspatercept will be administered after reconstitution (see Section 7) as a subcutaneous 
(SC) injection to the subjects by the study staff at the clinical site. Subcutaneous injections will 
be given in the upper arm, abdomen, or thigh, every 3 weeks during the Treatment Periods, 
unless dose delay or treatment discontinuation is indicated. Subjects will start luspatercept at 1.0
mg/kg dose level and can be dose escalated up to 1.25 mg/kg.
Control arm. Placebo to be used in the study will be sterile normal saline (0.9% sodium chloride 
for injection) administered as a SC injection. Designated individuals will prepare the placebo 
syringes to match the active syringe. Subcutaneous injections will be given in the upper arm, 
abdomen, or thigh every 3 weeks during the DBTP, unless dose delay or treatment 
discontinuation is indicated.
Overview of Key Efficacy Assessments
The primary efficacy assessment will include:

Hemoglobin values over a continuous 12-week interval from Week 13 to Week 24 of 
treatment in the absence of transfusions
Secondary efficacy assessments:

Quality of life (QoL) assessment using the non-transfusion dependent β-thalassemia-
patient reported outcome (NTDT-PRO)

Hemoglobin values over a continuous 12-week interval from Week 37 to Week 48 of 
treatment

Quality of Life assessed using SF-36 and FACIT-F

Liver iron concentration (LIC, mg/g dry weight [dw]) measured by magnetic 
resonance imaging (MRI) 

Daily dose of iron chelation therapy (ICT) use

Serum ferritin

Six-minute walk test (6MWT) distance 

Transfusion free intervals
Overview of Key Safety Assessments
All subjects will be assessed for safety by monitoring adverse events (AEs), clinical laboratory 
parameters, vital signs, physical examination, electrocardiogram (ECG), echocardiography, 


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
9
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
erythropoietin, anti-drug antibody (ADA) testing, and Eastern Cooperative Oncology Group 
(ECOG) performance status. 
Overview of Pharmacokinetic Assessments
Population pharmacokinetics will be evaluated, and the relationship between serum drug 
exposure and clinical endpoints of interest will be explored.
 
 
 
Statistical Methods
The analysis populations for this study include: intent-to-treat subjects (ITT), per protocol set
(PPS), and safety population (definition of each population is provided in Section 9).
Subjects will be randomized to receive luspatercept or placebo in a 2:1 ratio. Subjects will be 
stratified as described in the Section 3, Overall Study Design.
Based on the assumption of a targeted primary endpoint response rates at least 50% in the 
luspatercept group and 10% for the placebo group, and 2:1 randomization, a total sample size of 
150 (100 in the luspatercept group, 50 in the placebo group) will have at least 99% power to 
detect the difference between the 2 groups with a 2-sided alpha of 0.05 and assumed 10% drop-
out rate.
For NTDT-PRO tiredness and weakness (T/W) domain scores, assume the mean change from 
baseline scores at Week 24 are 1.2 and 0.5 for luspatercept and placebo group, respectively, with 
a common standard deviation of 1.2, the statistical power will be 91%.
Primary Efficacy Analysis: The primary efficacy endpoint of this study is erythroid response, 
defined as an increase from baseline ≥1.0 g/dL in mean of hemoglobin values over a continuous 
12-week interval from Weeks 13 to 24 of treatment in the absence of transfusions.
Hemoglobin (Hb) values within 21 days following a transfusion may be influenced by the 
transfusion and will be excluded from this analysis. Baseline Hb is the average of 2 or more Hb 
measurements at least 1 week apart within 4 weeks before Dose 1. For discontinued subjects who 


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
10
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
do not complete 24 weeks of the Double-blind Treatment Period, Hb data will continue to be 
collected in the post-treatment follow-up. 
Further description of the analyses is provided in Section 9.
Secondary Efficacy Analyses. Secondary endpoints will be measured at Week 24 and Week 48.
The results will be presented by treatment groups. The statistical tests will be conducted to 
compare the treatment groups. Detailed descriptions of the analyses are provided in Section 9.
Secondary efficacy analyses will include: Mean change in NTDT-PRO, mean change and 
responder analysis in Hemoglobin, mean change in FACIT-F Fatigue subscale, mean change in
SF-36 v2, LIC / ICT responder analysis, mean change in LIC, mean change in serum ferritin, 
transfusion-free period, duration of mean hemoglobin increase, mean change in the 6MWT.
Interim Analysis: No interim analysis is planned.
Timing of Analyses: The primary clinical study report (CSR) will include safety and efficacy 
parameters with a cut-off date at the time when the last subject enrolled in the DBTP has 
completed 48 weeks in the DBTP or discontinued earlier (ie, at the time of the unblinding of the 
study), whichever occurs later. Thus, the analysis will be conducted after all required information 
is available for these endpoints (ie, after all subjects have completed 48 weeks in the study or 
discontinued earlier).
The final CSR will include efficacy and safety data at the time of the End of the Trial (EOT 
definition in Section 3.3).


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
11
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
TABLE OF CONTENTS
TITLE PAGE..............................................................................................................................1
PROTOCOL SUMMARY ..........................................................................................................6
2.
STUDY OBJECTIVES AND ENDPOINTS...........................................................39
3.
OVERALL STUDY DESIGN ................................................................................45
3.1.
Study Design ..........................................................................................................45
3.1.1.
Screening Period.....................................................................................................45
3.1.2.
Double-blind Treatment Period...............................................................................45
3.1.3.
Open-label Phase....................................................................................................46
3.1.4.
Post-treatment Follow-up Period.............................................................................47
3.1.5.
Committees ............................................................................................................48
3.2.
Study Duration for Subjects....................................................................................50
3.3.
End of Trial ............................................................................................................50


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
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ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
4.
STUDY POPULATION.........................................................................................52
4.1.
Number of Subjects ................................................................................................52
4.2.
Inclusion Criteria....................................................................................................52
4.3.
Exclusion Criteria...................................................................................................53
5.
TABLE OF EVENTS.............................................................................................56
6.
PROCEDURES......................................................................................................66
6.1.
Screening Period.....................................................................................................66
6.1.1.
Rescreening............................................................................................................69
6.2.
Double-blind Treatment Period...............................................................................69
6.2.1.
Dose Delays in Double-blind Treatment Period ......................................................72
6.3.
Open Label Period..................................................................................................72
6.3.1.
Dose Delays in Open Label Treatment Period.........................................................75
6.4.
Post-treatment Follow-Up Period............................................................................75
6.5.
Pharmacokinetics....................................................................................................78
6.6.
Anti-Luspatercept Antibody....................................................................................78
6.8.
Quality of Life........................................................................................................79
6.9.
Screen Failures .......................................................................................................79
7.
DESCRIPTION OF STUDY TREATMENTS........................................................82
7.1.
Description of Investigational Product(s)................................................................82
7.2.
Treatment Administration and Schedule .................................................................82
7.2.1.
Dose Modifications: Dose Titration, Dose Reduction and Dose Delay....................84
7.2.1.1.
Dose Titration.........................................................................................................84
7.2.1.2.
Dose Delay and Dose Reduction.............................................................................84
7.2.1.3.
Overdose ................................................................................................................86
7.3.
Method of Treatment Assignment...........................................................................87
7.4.
Packaging and Labeling..........................................................................................87
7.4.1.
Blinding..................................................................................................................87
7.5.
Investigational Product Accountability and Disposal ..............................................88
7.6.
Investigational Product Compliance........................................................................88


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
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9.
STATISTICAL CONSIDERATIONS ....................................................................91
9.1.
Overview................................................................................................................91
9.2.
Study Population Definitions ..................................................................................91
9.3.
Sample Size and Power Considerations...................................................................91
9.4.
Background and Demographic Characteristics........................................................92
9.5.
Subject Disposition.................................................................................................92
9.6.
Efficacy Analysis....................................................................................................92
9.6.1.
Primary Efficacy Analysis ......................................................................................92
9.6.2.
Key Secondary Efficacy Analysis...........................................................................93
9.6.2.1.
NTDT-PRO (T/W Domain) Mean Change Between Weeks 13 to 24 ......................93
9.6.2.2.
Hemoglobin Mean Change Between Weeks 13 to 24..............................................93
9.6.2.3.
Hemoglobin Response Between Weeks 37 to 48.....................................................93
9.6.3.
Secondary Efficacy Analysis ..................................................................................94
9.6.3.1.
FACIT-F Fatigue Subscale: Mean Change from Baseline between Weeks 13 
to 24 and Weeks 37 to 48........................................................................................94
9.6.3.2.
NTDT-PRO SoB Domain: Mean Change from Baseline between Weeks 13 
to 24 and Weeks 37 to 48........................................................................................94
9.6.3.3.
Hemoglobin Mean Change Between Weeks 37 to 48..............................................94
9.6.3.4.
NTDT-PRO (T/W Domain) Mean Change Between Weeks 37 to 48 ......................94
9.6.3.5.
Definition of NTDT-PRO Minimum Clinical Important Difference (MCID) 
and Responder Definition (RD)Thresholds .............................................................94
9.6.3.6.
FACIT-F Fatigue Subscale: Response at Weeks 13 to 24 and Weeks 37 to 48 ........95
9.6.3.7.
SF-36 v2: Mean Change from Baseline at Week 24 and Week 48...........................95
9.6.3.8.
LIC / ICT: Responder Analysis at Week 24 and Week 48.......................................95
9.6.3.9.
Serum Ferritin: Mean Change from Baseline at Week 24 and Week 48...................95
9.6.3.10.
Liver Iron Concentration: Mean Change from Baseline at Weeks 24 and 48 ...........96
9.6.3.11.
Transfusion Free for 24 and 48 weeks.....................................................................96
9.6.3.12.
Duration of Mean Hemoglobin Increase from Baseline ≥1.0 g/dL...........................96


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
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ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
9.6.3.13.
6MWT: Mean Change at Week 24 and 48 ..............................................................96
9.6.3.14.
Proportion of Mean Hemoglobin Increase From Baseline ≥1.5 g/dL at Week 
13 to 24 ..................................................................................................................96
9.7.
Safety Analysis.......................................................................................................97
9.8.
Interim Analysis .....................................................................................................97
9.9.
Timing of Analyses ................................................................................................97
9.9.1.
Primary Clinical Study Report................................................................................97
9.9.2.
Final Clinical Study Report.....................................................................................97
9.10.
Other Topics...........................................................................................................97
9.10.1.
Pharmacokinetic Analysis.......................................................................................97
9.10.3.
Data Monitoring Committee (DMC).......................................................................98
9.10.4.
Scientific Steering Committee (SSC)......................................................................98
10.
ADVERSE EVENTS............................................................................................100
10.1.
Monitoring, Recording and Reporting of Adverse Events .....................................100
10.2.
Evaluation of Adverse Events...............................................................................101
10.2.1.
Seriousness...........................................................................................................101
10.2.2.
Severity/ Intensity.................................................................................................102
10.2.3.
Causality ..............................................................................................................102
10.2.4.
Duration ...............................................................................................................103
10.2.5.
Action Taken........................................................................................................103
10.2.6.
Outcome...............................................................................................................103
10.3.
Abnormal Laboratory Values................................................................................103
10.4.
Pregnancy.............................................................................................................104
10.4.1.
Females of Childbearing Potential: .......................................................................104
10.4.2.
Male Subjects.......................................................................................................104
10.5.
Reporting of Serious Adverse Events....................................................................105
10.5.1.
Safety Queries ......................................................................................................105
10.5.2.
Thromboembolic Events.......................................................................................105
10.5.3.
Malignancy and Premalignancy Reporting............................................................105
10.6.
Expedited Reporting of Adverse Events................................................................106
11.
DISCONTINUATIONS .......................................................................................108
11.1.
Treatment Discontinuation....................................................................................108


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Luspatercept (ACE-536)
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Celgene Corporation
Confidential and Proprietary
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11.2.
Study Discontinuation ..........................................................................................108
12.
EMERGENCY PROCEDURES...........................................................................110
12.1.
Emergency Contact...............................................................................................110
12.2.
Emergency Identification of Investigational Products (Emergency 
Unblinding) ..........................................................................................................110
13.
REGULATORY CONSIDERATIONS.................................................................111
13.1.
Good Clinical Practice..........................................................................................111
13.2.
Investigator Responsibilities .................................................................................111
13.3.
Subject Information and Informed Consent...........................................................112
13.4.
Confidentiality......................................................................................................112
13.5.
Protocol Amendments...........................................................................................112
13.6.
Institutional Review Board/Independent Ethics Committee Review and 
Approval ..............................................................................................................112
13.7.
Ongoing Information for Institutional Review Board/ Ethics Committee ..............113
13.8.
Termination of the Study ......................................................................................113
14.
DATA HANDLING AND RECORDKEEPING...................................................115
14.1.
Data/Documents ...................................................................................................115
14.2.
Data Management.................................................................................................115
14.3.
Record Retention..................................................................................................115
15.
QUALITY CONTROL AND QUALITY ASSURANCE......................................117
15.1.
Study Monitoring and Source Data Verification....................................................117
15.2.
Audits and Inspections..........................................................................................117
15.3.
Product Quality Complaint ...................................................................................117
16.
PUBLICATIONS .................................................................................................119
18.
APPENDICES......................................................................................................124
Appendix A: Table of Abbreviations.......................................................................................124
Appendix B: ECOG Performance Status Scale........................................................................129
Appendix C: National Cancer Institute (NCI) Common Terminology Criteria for 
Adverse Events (CTCAE) Version 4.0..................................................................130
Appendix D: New York Heart Association - Classification of Heart Failure............................131


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LIST OF TABLES
Table 1:
Study Objectives.....................................................................................................39
Table 2:
Study Endpoints .....................................................................................................40
Table 3:
Table of Events.......................................................................................................56
Table 4:
Starting Dose Level with Dose Titrations................................................................84
Table 5:
Dose Delay, Dose Reduction, and Treatment Discontinuation Guidelines...............85
Table 6:
Abbreviations and Specialist Terms......................................................................124


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
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ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
LIST OF FIGURES
Figure 1:
Transfusion Requirement in Thalassemia................................................................19
Figure 2:
Pathophysiology and Clinical Complications in β-Thalassemia...............................21
Figure 3:
Pathophysiology of NTDT......................................................................................22
Figure 4:
Current Indications for Transfusion Therapy in NTDT Subtypes ............................24
Figure 5:
Liver Iron Content (LIC) in Patients with β-Thalassemia Intermedia 
Associated Morbidities ...........................................................................................25
Figure 6:
Luspatercept Schematic Representation and Mechanism of Action .........................29
Figure 7:
Overall Study Design..............................................................................................49
Figure 8:
Subjects Study Periods Flowchart...........................................................................50












































EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
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ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
2.
STUDY OBJECTIVES AND ENDPOINTS
Table 1:
Study Objectives
Primary Objective
To evaluate the effect of luspatercept versus placebo on anemia, as measured by mean 
hemoglobin values in the absence of transfusions over continuous 12-week intervals, from 
Week 13 to Week 24, compared to baseline
Secondary Objectives
To evaluate the effect of luspatercept versus placebo on anemia-related symptoms in patients 
with β-thalassemia, as measured by non-transfusion dependent β-thalassemia-patient reported 
outcome (NTDT-PRO) over 2 continuous 12-week interval (Weeks 13 to 24, Weeks 37 to 48) 
compared to baseline
To evaluate the effect of luspatercept versus placebo on functional and health-related quality 
of life (QoL) as measured by the Medical Outcomes Study 36-Item Short Form (SF-36) and 
Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-F) questionnaires
To evaluate the long-term effect of luspatercept versus placebo on anemia, as measured by 
mean hemoglobin concentration in the absence of transfusions over a continuous 12-week 
interval from Week 37 to Week 48, compared to baseline
To evaluate the effect of luspatercept versus placebo on iron overload, as measured by liver 
iron concentration (LIC) and iron chelation therapy (ICT) daily dose
To evaluate the effect of luspatercept versus placebo on iron overload, as measured by serum 
ferritin
To evaluate the duration of erythroid response
To evaluate the effect of luspatercept versus placebo on physical activity measured by 6-
minute walk (6MWT)
Safety and PK Objectives
To evaluate safety and tolerability of luspatercept, including immunogenicity
To evaluate population pharmacokinetics (PK) of luspatercept in subjects with -thalassemia
 
 
 
 


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
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ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 2:
Study Endpoints
Endpoint
Name 
Description
Endpoint 
Measurement
Wk 24
Wk 48
Primary
Efficacy 
Endpoint
Proportion of subjects who have an increase from baseline ≥1.0 
g/dL in mean of hemoglobin values over a continuous 12-week 
interval from Week 13 to Week 24 in the absence of transfusions
Baseline hemoglobin (Hb) is the 
average of 2 or more Hb 
measurements at least 1 week apart 
within 4 weeks prior to Dose 1.
X
Key Secondary 
Efficacy 
Endpoints
Mean change from baseline in non-transfusion dependent β-
thalassemia-patient reported outcome (NTDT-PRO) Tiredness and 
Weakness (T/W) domain score over a continuous 12-week interval 
from Week 13 to Week 24 
NTDT-PRO is administered as a 
daily diary for 24 weeks and after 
that over the 7 days prior to 
receiving IP dose.
X
Mean change from baseline in mean of hemoglobin values over a 
continuous 12-week interval from Week 13 to Week 24 in the 
absence of transfusions
See description above for baseline 
Hb 
X
Proportion of subjects who have an increase from baseline ≥1.0 
g/dL in mean of hemoglobin values over a continuous 12-week 
interval from Week 37 to Week 48 in the absence of transfusions
See description above for baseline 
Hb
X
Secondary 
Efficacy 
Endpoints
Mean change from baseline in mean Functional Assessment of 
Chronic Illness Therapy-Fatigue (FACIT-F) Fatigue subscale
score over a continuous 12-week interval from Week 13 to Week 
24
FACIT-F is administered to 
subjects every other dose prior to 
receiving IP dose.
X
Mean change from baseline in mean NTDT-PRO Shortness of 
Breath (SoB) domain over a continuous 12-week interval from 
Week 13 to Week 24
See description above for NTDT-
PRO
X
Mean change from baseline in mean hemoglobin values over a 
continuous 12-week interval from Week 37 to Week 48 in the 
absence of transfusions
See description above for baseline 
Hb
X


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
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ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 2:
Study Endpoints (Continued)
Endpoint
Name 
Description
Endpoint 
Measurement
Wk 24
Wk 48
Secondary 
Efficacy
Endpoints
Mean change from baseline in mean FACIT-F Fatigue subscale, 
mean NTDT-PRO T/W domain and mean NTDT-PRO SoB 
domain over a continuous 12-week interval from Week 37 to 
Week 48
See description above for FACIT-F 
and NTDT-PRO
X
Proportion of subjects with an increase from baseline ≥ 3 in mean 
FACIT-F Fatigue subscale score over a continuous 12-week 
interval from Week 13 to Week 24 
See description above for FACIT-F
X
Proportion of subjects with an increase from baseline ≥ 3 in mean 
FACIT-F Fatigue subscale score over a continuous 12-week 
interval from Week 37 to Week 48 
See description above for FACIT-F
X
Mean change from baseline in the physical component summary 
(PCS) and mental component summary (MCS) scores of the 
Medical Outcomes Study 36-Item Short Form (SF-36) at Week 24 
and Week 48
SF-36 is administered to subjects 
every other dose prior to receiving 
IP dose
X
X
Proportion of subjects with improvement of iron overload at Week
24 and Week 48, as measured by:
o For subjects with baseline liver iron concentration (LIC) (by 
magnetic resonance imaging [MRI]) ≥3 mg/g dw: ≥20% 
reduction in LIC, OR ≥33% decrease in iron chelation 
therapy (ICT) daily dose
o For subjects with baseline LIC (by MRI) < 3 mg/g dw: no 
increase in LIC > 1 mg/g dw AND not starting treatment with 
ICT or no increase in ICT daily dose ≥33%, if on ICT at 
baseline
Baseline ICT dose is based on 
medical history over 24 weeks prior 
to randomization; ICT drug and 
dose collected at every visit
X
X


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
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Table 2:
Study Endpoints (Continued)
Endpoint
Name 
Description
Endpoint 
Measurement
Wk 24
Wk 48
Secondary
Efficacy 
Endpoints
Mean change from baseline in serum ferritin at Week 24, Week 48
and up to last assessment 
All values available in the medical 
history over 24 weeks prior to 
randomization will be entered in the 
Electronic case report form (eCRF)
X
X
Mean change from baseline in LIC at Week 24, Week 48 and up to 
last assessment
LIC at screening, Week 24, 48 and 
in the OLP, as applicable
X
X
Proportion of subjects who are transfusion-free over 24 weeks
Occurrence of transfusions is 
assessed at every visit
X
Proportion of subjects who are transfusion-free over 48 weeks 
See description above
X
Duration of the mean hemoglobin increase from baseline ≥1.0 
g/dL
Time from first to last Hb 
measurement with increase from 
baseline ≥1.0 g/dL
X
X
Mean change from baseline in the 6-minute walk test (6MWT)
distance at Week 24 and Week 48
6MWT is performed every 4 doses, 
eg, Dose 1, 5, 9, etc. and at Week
24 & Week 48 (± 7 days) regardless 
of dose delay and even if the IP is 
discontinued
X
X
Proportion of subjects who have an increase from baseline ≥1.5 
g/dL in mean of hemoglobin values over a continuous 12-week 
interval from Week 13 to Week 24 in the absence of transfusions
See description above for baseline 
Hb
X
Proportion of subjects with a decrease from baseline ≥ RD in mean 
NTDT-PRO T/W score, over Weeks 13 to 24 and Weeks 37 to 48 
NTDT-PRO is administered as a 
daily diary for 24 weeks and after 
that over the 7 days prior to 
receiving IP dose
X
X


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
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Table 2:
Study Endpoints (Continued)
Endpoint
Name 
Description
Endpoint 
Measurement
Wk 24
Wk 48
Safety and PK 
Safety and tolerability, including immunogenicity
Type, frequency, severity and 
relationship to investigational 
product (IP) of adverse events; 
frequency of anti-drug antibodies 
and their effect on efficacy and 
safety
X
X
Pharmacokinetics (PK) 
PK parameters 
X
X
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
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ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 2:
Study Endpoints (Continued)
Endpoint
Name 
Description
Endpoint 
Measurement
Wk 24
Wk 48
 


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536- B-THAL-002
Celgene Corporation
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3.
OVERALL STUDY DESIGN
3.1.
Study Design
This is a Phase 2, double-blind, randomized, placebo-controlled, multicenter study to determine 
the efficacy and safety of luspatercept (ACE-536) versus placebo in adults with non-transfusion
dependent beta ()-thalassemia. The study is divided into the Screening Period, Double-blind 
Treatment Period (DBTP), Open-label Phase (OLP) and Post-treatment Follow-up Period
(PTFP). The overall study design is described in Figure 7.
It is planned to randomize approximately 150 subjects at a 2:1 ratio of luspatercept versus 
placebo.
3.1.1.
Screening Period
Upon giving written informed consent, the subject enters the Screening Period to determine 
eligibility. A subject identification document (ID) number will be allocated via the Interactive 
Response Technology (IRT) system as detailed in Section 7.3. The Screening Period will last up 
to 4 weeks with an administrative window of + 3 days to allow all laboratory results to be 
available at site for evaluating the subject’s eligibility. During the Screening Period, the subject 
will undergo safety and other assessments to determine eligibility for the study as detailed in 
Table 3, Table of Events.
If the subject received transfusions during the 24 weeks prior to randomization, 24 weeks of 
transfusion history (including units or volume transfused and pre-transfusion hemoglobin level), 
should be recorded in the subject’s electronic case report form (eCRF). If subjects received ICT 
during the 24 weeks prior to randomization, 24 weeks of ICT use history (including types of ICT 
and doses) should be recorded in the subject’s electronic case report form (eCRF).
Re-screening is allowed, and a new subject ID number will be assigned (see Section 6.1).
Subjects will be stratified at the time of randomization based on: 
1. Baseline hemoglobin level: 

≥ 8.5 g/dL

< 8.5 g/dL
2. Baseline NTDT-PRO T/W score:

≥3 points

< 3 points
3.1.2.
Double-blind Treatment Period
Subjects will enter the Double-blind Treatment Period (DBTP) once they have completed the 
required assessments in the Screening Period and been randomized via the IRT system, as 
detailed in Section 7.3. The DBTP will begin on Dose 1 Day 1 and will end when all subjects 
have completed 48 weeks of treatment or have discontinued earlier. At that time, the study will 
be unblinded.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
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Subject randomization will occur via the IRT system and Dose 1 Day 1 should be scheduled 
within 3 days of randomization (can be on the same day as randomization).
Eligible subjects will be randomized at a ratio of 2:1, luspatercept versus placebo, at a starting 
dose level of 1.0 mg/kg administered by subcutaneous (SC) injection once every 3 weeks. The 
maximum total dose per administration is 120 mg.
Best supportive care is allowed in both the luspatercept and placebo groups. This will include 
RBC transfusions, iron-chelating agents, use of antibiotic therapy, antiviral and antifungal 
therapy, nutritional support as needed, and other medications that are not prohibited (see 
Section 8.2), thus minimizing the safety risk to patients. Please, also refer to Section 8.1.2 for 
concomitant medication for anemia, Section 8.1.3 for concomitant iron chelation therapy use and 
Section 8.1.4 for concomitant RBC transfusions.
Study visits and serial measurements of safety and efficacy parameters will be performed as 
described in Table 3, Table of Events.
After the study is unblinded, and after DMC’s recommendation:

Subjects who received placebo and have been assessed as per protocol at least up to 
48 weeks after the first dose of IP (even if the IP is discontinued before complete 48 
weeks of treatment), may access the Open Label Period (OLP) to receive luspatercept for
a maximum 15 months before moving to the rollover protocol for longer treatment.

Subjects receiving luspatercept may continue their treatment in the OLP for maximum 
15 months before moving to the rollover protocol for longer treatment (ie, 5 years from 
Dose 1 in the DBTP, or until treatment discontinuation, whichever occurs later).

Subjects who received luspatercept and discontinued the IP in the DBTP may continue
and/or complete the PTFP of 5 years from first dose of IP, or 3 years from last dose 
(whichever occurs later), to complete the Post-treatment Follow-up Period under the 
rollover protocol in this study until the of End of Trial (see Section 3.3).
Subjects may be discontinued from treatment and/or the study for reasons described in Section 
11.1 and Table 5. The decision to discontinue a subject from study treatment is the responsibility 
of the treating physician; the Sponsor will not delay or refuse it. However, prior to deciding to 
discontinue a subject, it is recommended that the Investigator contact the Medical Monitor of this 
study and provide any supporting information for review and discussion. Possible dose 
modifications are detailed in Section 7.2.1. 
3.1.3.
Open-label Phase
The start of this Open-label Phase (OLP) will be determined by the availability of primary 
analysis data that justify the use of luspatercept in an OLP, which will be reviewed by the 
independent external DMC. After review of safety and efficacy, the DMC will determine if the 
use of luspatercept in subjects previously randomized to receive placebo in this OLP is safe and 
recommended, and if subjects already on luspatercept can continue to be treated at their current 
dose level (best supportive care is allowed). In the OLP, subjects may receive luspatercept for 
maximum 15 months or discontinue.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
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Access to the OLP:
Subjects initially assigned to placebo in the DBTP may enter the OLP only if the DMC allows it, 
as outlined above, and if:
o
they are still receiving placebo at the time of unblinding, or
o
they discontinued the treatment before the unblinding, but they continued their 
participation in the PTFP until the unblinding and complied with the PTFP 
assessments, as detailed in Section 5 Table of Events, and they still fulfill the 
following selected eligibility criteria prior to Dose 1 Day 1, as per PI assessment 
using central lab data: 

Inclusion criteria: numbers 8-10 (Refer to Section 4.2)

Exclusion criteria: numbers 1-8, 10, 12-15, 17, 18 and 20 (Refer to 
Section 4.3)
Subjects initially assigned to luspatercept in the DBTP can enter the OLP if they are still 
receiving luspatercept at the time of unblinding and may continue their treatment in the rollover 
protocol, after completion of the OLP. Note: Per Investigator’s request, subjects who 
discontinued luspatercept in the DBTP for reasons not related to subject’s safety, and are still in 
the PTFP at the time of unblinding, may access the OLP and be re-treated with luspatercept after 
consultation with Sponsor Medical Monitor and review of safety and efficacy data as long as 
they still fulfill the study eligibility criteria prior to Dose 1 Day 1.
Subjects who discontinue from the study before the unblinding and without completing the PTFP 
period are not allowed to re-enter this study and access luspatercept in the OLP.
Subjects may be discontinued from treatment and/or study as described in Section 11 and 
Table 5.
3.1.4.
Post-treatment Follow-up Period
Subjects who discontinue treatment with the IP in the DBTP or OLP, regardless of reason, will 
enter the PTFP and may continue or complete the long-term follow-up of 5 years from first dose 
of IP, or 3 years from last dose (whichever occurs later), under the rollover protocol until the End 
of Trial (see Section 3.3). Specific assessments and visits to be performed during this period are 
defined in Table 3, Table of Events. After the unblinding, and after DMC’s recommendation:

Subjects who received placebo and have been assessed as per protocol at least up to 48 
weeks after the first dose of IP (even if the IP is discontinued before completing 48 weeks 
of treatment), may stop the PTFP and access the OLP to receive luspatercept, if eligible.

Subjects who received luspatercept and discontinued the IP in the DBTP or OLP may 
complete the PTFP and continue or complete the long-term follow-up of 5 years from 
first dose of IP, or 3 years from last dose (whichever occurs later), to complete the Post-
treatment Follow-up Period under the rollover protocol until the End of Trial (see 
Section 3.3). Note: only the visit at 9 weeks after last dose may be performed in this 
study before moving to the rollover study.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
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3.1.5.
Committees
The conduct of this trial will be overseen by an independent external Data Monitoring 
Committee (DMC) and by a steering committee (SC). During the DBTP, the DMC will review 
unblinded data, while the SC will not have access to unblinded data. Refer to Section 9.10.3 and
Section 9.10.4 for additional information. Further details will be provided in the DMC and SC 
charters.
The study will be conducted in compliance with the International Council for Harmonisation 
(ICH) of Technical Requirements for Registration of Pharmaceuticals for Human Use/Good 
Clinical Practice (GCP) and applicable regulatory requirements.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
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Figure 7:
Overall Study Design
EOS: end of study; EOT: end of trial; ICF: informed consent form; IP: investigational product; Q3W: every 3 weeks; SC: Subcutaneous.
a Dose may be titrated up to a maximum of 1.25 mg/kg.
b Double-blind Treatment Period (DBTP) will end after last subject enrolled has completed 48 weeks of treatment or discontinued earlier, or when the study is unblinded.
c The study will be unblinded 48 weeks after last subject has received the first dose of IP. At that time, subjects still benefitting from luspatercept treatment as well as subjects who 
received placebo and have been assessed as per protocol up to 48 weeks after the first dose of IP (even if they have discontinued the IP before completing 48 weeks of treatment), 
may access the OLP to receive luspatercept for maximum 15 months on the basis of DMC recommendation after unblinded data review, and can continue treatment in the 
rollover protocol after EOT up to 5 years of Dose 1, or treatment discontinuation, whichever occurs later.
d Subjects in the DBTP who have discontinued luspatercept before the unblinding will continue the PTFP until the End of Trial (EOT) and may continue the PTFP in the rollover 
study up 5 years from first dose of IP, or 3 years from last dose (whichever occurs later), may complete the Post-treatment Follow-up Period under the rollover protocol. Subjects
in the DBTP who have discontinued the placebo before the unblinding will continue the PTFP until the unblinding and may access the OLP, after DMC’s recommendation.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
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Figure 8:
Subjects Study Periods Flowchart
DBTP: double-blind treatment period; IP: investigational product; OLP: open-label phase; PTFP: post-treatment 
follow-up period.
3.2.
Study Duration for Subjects 
Study participation for each individual subject will be approximately 4 weeks in the 
Screening Period, at least 48 weeks in the DBTP, maximum 15 months in the OLP and 5 years 
from first dose of IP, or 3 years from last dose (whichever occurs later) in Post-treatment Follow-
up Period until the End of Trial (Section 3.3)
End of Treatment for each individual subject is defined as the date of the last IP dose in the 
DBTP or OLP, whichever occurs later.
End of Study for each individual subject should occur after the study is unblinded (ie, 48 
weeks after last subject has received the first dose of IP), and the OLP or the PTFP have been 
completed, as appropriate, or at the End of Trial as defined in Section 3.3, whichever occurs 
later.
3.3.
End of Trial
The End of Trial is defined as the date all subjects complete the OLP (if allowed to access the 
OLP as defined in Section 3.1.3), or discontinue earlier, or, the date of receipt of the last data 


EDMS Doc. Number: 24782414 - 21759172
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point from the last subject that is required for primary, secondary, and/or exploratory analysis, as 
prespecified in the protocol, whichever is the later date.
The Sponsor may end the trial when all key endpoints and objectives of the study have been 
analyzed, and the availability of a rollover protocol exists into which any subjects remaining on 
study may be consented and continue to receive access to luspatercept, if not yet commercially 
available, and/or complete the PTFP.


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
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4.
STUDY POPULATION
4.1.
Number of Subjects 
Approximately 150 subjects diagnosed with non-transfusion dependent -thalassemia (including 
Hemoglobin E/ β-thalassemia, excluding Hemoglobin S/β-thalassemia and Hemoglobin H) will 
be randomized.
4.2.
Inclusion Criteria
Subjects must satisfy the following criteria to be enrolled in the study:
1. Subjects must be 18 years of age at the time of signing the informed consent document 
(ICF).
2. Subject must understand and voluntarily sign an ICF prior to any study-related 
assessments/procedures being conducted.
3. Subject is willing and able to adhere to the study visit schedule (eg, not scheduled to receive 
hematopoietic stem cell transplantation) and other protocol requirements.
4. Subject must have documented diagnosis of β-thalassemia or hemoglobin E/ β-thalassemia. 
Concomitant alpha globin mutation and/or duplication are allowed.
5. Subject must be non-transfusion dependent, defined as 0 to 5 units of RBCs received during 
the 24-week period prior to randomization. Note: 1 unit defined for this entry criterion as 
approximately 200 to 350 mL of transfused packed RBCs.
6. Subject must not be on a regular transfusion program and must be RBC transfusion-free for 
at least ≥ 8 weeks prior to randomization
7. Subject must have mean baseline hemoglobin ≤10 g/dL, based on a minimum of 2 
measurements ≥1 week apart within 4 weeks prior to randomization; hemoglobin values 
within 21 days post-transfusion will be excluded.
8. Subject must have performance status: Eastern Cooperative Oncology Group (ECOG)
performance score of 0 to 1. 
9. A female of childbearing potential (FCBP) for this study is defined as a female who: 1) has 
achieved menarche at some point, 2) has not undergone a hysterectomy or bilateral 
oophorectomy or 3) has not been naturally postmenopausal (amenorrhea following cancer 
therapy does not rule out childbearing potential) for at least 24 consecutive months (ie, has 
had menses at any time in the preceding 24 consecutive months). A FCBP participating in the 
study must:
a.
Have 2 negative pregnancy tests as verified by the Investigator prior to starting study 
therapy. She must agree to ongoing pregnancy testing during the study, and after end 
of study treatment. This applies even if the subject practices true abstinence* from 
heterosexual contact.
b. Either commit to true abstinence* from heterosexual contact (which must be 
reviewed on a monthly basis and source documented). If a FCBP engages in sexual 
activity that may result in a pregnancy, she must agree to use, and be able to comply 


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with, effective contraception** without interruption, 28 days prior to starting IP, 
during the study therapy (including dose interruptions), and for 12 weeks 
(approximately 5 times the mean terminal half-life of luspatercept based on multiple-
dose pharmacokinetics [PK] data) after discontinuation of study therapy.
10. Male subjects must:
a.
Practice true abstinence* (which must be reviewed on a monthly basis) or agree to 
use a condom during sexual contact with a pregnant female or a female of 
childbearing potential** while participating in the study, during dose interruptions 
and for at least 12 weeks (approximately 5 times the mean terminal half-life of 
luspatercept based on multiple-dose PK data) following IP discontinuation, even if he 
has undergone a successful vasectomy
* True abstinence is acceptable when it is in line with the preferred and usual lifestyle of the subject. [Periodic 
abstinence (eg, calendar, ovulation, symptothermal, post-ovulation methods) and withdrawal are not acceptable 
methods of contraception.]
** Agreement to use highly effective methods of contraception that alone or in combination resulting in a 
failure rate of a Pearl index of less than 1% per year when used consistently and correctly throughout the course 
of the study. Such methods include: Combined (estrogen and progestogen containing) hormonal contraception:
Oral; Intravaginal; Transdermal; Progestogen-only hormonal contraception associated with inhibition of 
ovulation: Oral; Injectable hormonal contraception; Implantable hormonal contraception; Placement of an 
intrauterine device (IUD); Placement of an intrauterine hormone-releasing system (IUS); Bilateral tubal 
occlusion; Vasectomized partner; Sexual Abstinence.
4.3.
Exclusion Criteria
The presence of any of the following will exclude a subject from enrollment:
1. Subject has any significant medical condition, laboratory abnormality, or psychiatric 
illness that would prevent the subject from participating in the study.
2. Subject has any condition including the presence of laboratory abnormalities, which 
places the subject at unacceptable risk if he/she were to participate in the study.
3. Subject has any condition that confounds the ability to interpret data from the study.
4. Subject has a diagnosis of hemoglobin S/β-thalassemia or alpha (α)-thalassemia (eg,
Hemoglobin H). 
5. Subject has active hepatitis C (HCV) infection as demonstrated by a positive HCV-RNA 
test of sufficient sensitivity, or active infectious hepatitis B as demonstrated by the 
presence of hepatitis B surface antigen (HBsAG) and/or hepatitis B virus DNA (HBV-
DNA) positive, or known positive human immunodeficiency virus (HIV).
Note: Subjects receiving antiviral therapies should have 2 negative HCV-RNA test 3 
months apart before ICF signature, ie, one test at the end of the anti-viral therapy and 
second test 3 months following the first test.
6. Subject had deep vein thrombosis (DVT) or stroke requiring medical intervention ≤ 24 
weeks prior to randomization.
7. Subjects on chronic anticoagulant therapy are excluded, unless they stopped the treatment 
at least 28 days prior to randomization. Anticoagulant therapies for prophylaxis and for 


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
54
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
surgery or high-risk procedures as well as low molecular weight (LMW) heparin for 
superficial vein thrombosis (SVT) and chronic aspirin are allowed before and during the 
study.
8. Subject has received treatment with another investigational drug or device ≤ 28 days 
prior to randomization. 
9. Subject had prior exposure to sotatercept (ACE-011) or luspatercept (ACE-536).
10. Subject has platelet count > 1000 x 109/L.
11. Subjects on iron chelation therapy (ICT) at the time of ICF signature must have initiated 
the treatment with ICT at least 24 weeks before the predicted randomization date. ICT 
can be initiated at any time during treatment and should be used according to the label.
12. Subject had Hydroxyurea and ESA treatment ≤ 24 weeks prior to randomization, and no 
prior gene therapy.
13. Subject is pregnant or a lactating female.
14. Subject has uncontrolled hypertension. Controlled hypertension for this protocol is 
considered ≤Grade 1 according to National Cancer Institute Common Terminology for 
Adverse Events (NCI CTCAE) version 4.0 (current active minor version).
15. Subject has major organ damage, including:
a. Liver disease with alanine aminotransferase (ALT) > 3 x upper limit of normal 
(ULN) or history/evidence of cirrhosis, as well as presence of liver solid 
masses/tumor detected by ultrasound at screening.
b. Heart disease, heart failure as classified by the New York Heart Association 
(NYHA) classification 3 or higher, or significant arrhythmia requiring treatment, or 
recent myocardial infarction (MI) within 6 months of randomization.
c. Severe lung disease, including pulmonary fibrosis or pulmonary hypertension, ie, 
≥G3 NCI CTCAE version 4.0 (current active minor version).
d. Estimated glomerular filtration rate (eGFR) < 60 ml/min/1.73 m2 (per Modification 
of Diet in Renal Disease [MDRD] formula).
16. Subject has received chronic systemic glucocorticoids ≤ 12 weeks prior to randomization 
(physiologic replacement therapy for adrenal insufficiency is allowed).
17. Subject had major surgery ≤ 12 weeks prior to randomization (subjects must have 
completely recovered from any previous surgery prior to randomization).
18. Subject has history of severe allergic or anaphylactic reactions or hypersensitivity to 
recombinant proteins or excipients in the investigational product (see Investigator 
Brochure).
19. Subject has received immunosuppressants ≤ 28 days prior to randomization.
20. Subject has history or current malignancies (solid tumors and hematological 
malignancies) unless the subject has been free of the disease (including completion of 
any active or adjuvant treatment for prior malignancy) for ≥ 5 years. However, subjects 
with the following history/concurrent conditions are allowed:


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
55
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020

Basal or squamous cell carcinoma of the skin

Carcinoma in situ of the cervix

Carcinoma in situ of the breast

Incidental histologic finding of prostate cancer (T1a or T1b using the tumor, nodes, 
metastasis [TNM] clinical staging system)


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
56
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
5.
TABLE OF EVENTS
Table 3:
Table of Events
Assessments
Ref.
Screening 
Period
Double-blind Treatment Period (DBTP)
(Luspatercept or Placebo)
Open-label Period (OLP)
(Luspatercept)
Post-treatment Follow-up Period 
(PTFP)
From 
Week -4 
to Day -1
Week 1
Dose 1 
From Dose 2
up to Unblinding
Week -1 
(Placebo
subj. from 
PTFP)16
From 
Week N 
Dose 1 (subj. 
allowed in 
the OLP)17
Subjects who 
did not 
complete 48 
weeks in 
DBTP 9
All subjects
regardless of 
treatment 
duration with 
IP10
End 
of 
Study
11
(+3 days)
Day 1
(+3 
days)
Day 1
(±3 days)
Dose 6
Day 8
(±3 
days)
Dose 6
Day 15
(±3 
days)
Weeks14
13, 19, 37, 
42
(± 7 days)
Weeks1
4 24 & 
48
(± 7 
days)
Week -1 
(- 5 days)
Day 1
(+5 days)
Weeks 913, 
19, 24, 37, 42 
& 48 after 
first dose, if 
not already 
done in 
DBTP
(±7 days)
9 wks 
after 
last 
dose
(±7 
days)
Every 24 
wks10
(±7 days)
At 
any 
time 
or 
End 
of 
Trial
11
Informed consent
6.1
X
-
-
-
-
-
-
-
-
-
-
-
-
Inclusion/exclusion 
criteria
6.1
X
-
-
-
-
-
-
X16
-
-
-
-
-
Demographics
6.1
X
-
-
-
-
-
-
-
-
-
-
-
-
Medical history
6.1
X
-
-
-
-
-
-
-
-
-
-
-
-
β-thalassemia 
comorbidities assessment 
for NTDT severity score 
system
6.1
6.2
6.4
X
-
-
-
-
-
X
-
-
Wks 24 & 48 
-
-
-
β-thalassemia genotype 
(only if not already 
available; central or local 
lab)
6.1
X
-
-
-
-
-
-
-
-
-
-
-
-
Hepatitis B & C12 (local 
or central lab) if not done 
within 10 weeks of ICF 
signature 
6.1
X
-
-
-
-
-
X
-
-
-
-
-
-
Iron Chelation Therapy 
(history starting from at 
least 24 weeks prior to 
Dose 1 Day 1 in DBTP)
6.1
to
6.4
X
Record on ongoing basis, until 9 weeks after last dose18


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
57
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 3:
Table of Events (Continued)
Assessments
Ref.
Screening 
Period
Double-blind Treatment Period (DBTP)
(Luspatercept or Placebo)
Open-label Period (OLP)
(Luspatercept)
Post-treatment Follow-up Period 
(PTFP)
From 
Week -4 
to Day -1
Week 1
Dose 1 
From Dose 2
up to Unblinding
Week -1 
(Placebo 
subj. from 
PTFP)16
From 
Week N 
Dose 1 (subj. 
allowed in 
the OLP)17
Subjects who 
did not 
complete 48 
weeks in 
DBTP 9
All subjects
regardless of 
treatment 
duration with 
IP10
End 
of 
Stud
y11
(+3 days)
Day 1
(+3 
days)
Day 1
(±3 days)
Dose 6
Day 8
(±3 
days)
Dose 6
Day 15
(±3 
days)
Weeks14
13, 19, 37, 
42
(± 7 days)
Weeks14
24 & 48
(± 7 
days)
Week -1 
(- 5 days)
Day 1
(+5 days)
Weeks 913, 
19, 24, 37, 42 
& 48 after 
first dose, if 
not already 
done in 
DBTP
(±7 days)
9 wks 
after 
last 
dose
(±7 
days)
Every 24 
wks10
(±7 days)
At 
any 
time 
or 
End 
of 
Trial 
11
Prior / Concomitant / Post 
treatment (disease 
specific)/ Medications / 
Therapies 
6.1
to
6.4
X
Record on ongoing basis, until 9 weeks after last dose18
Prior/ Concomitant / Post 
treatment procedures (eg, 
surgery, radiation 
therapy).
6.1
to
6.4
X
Record on ongoing basis, until 9 weeks after last dose18
Transfusion assessment 
(history starting from at 
least 24 weeks prior to 
Dose 1 Day 1 in DBTP 
and OLTP)
6.1
to
6.4
X
Record on ongoing basis, until 9 weeks after last dose18
Adverse events 
6.1
to
6.4
Starting after informed consent signature, on ongoing basis until 9 weeks after last dose, only related SAEs to be reported until End of Study
Malignancy and 
premalignancy reporting 
(Section 10.5.3)13
6.1
to
6.4
Continuous reporting occurrence of any case regardless of causality, starting after informed consent signature
X13
X13
Vital signs1
6.1
to
6.4
X
X
X (every 
dose)
-
-
-
-
-
X
-
X 
-
-
Height (at Screening 
only) and weight
6.1
to
6.4
X
X
X (every 
dose)
-
-
-
-
-
X
-
X 
-
-


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
58
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 3:
Table of Events (Continued)
Assessments
Ref.
Screening 
Period
Double-blind Treatment Period (DBTP)
(Luspatercept or Placebo)
Open-label Period (OLP)
(Luspatercept)
Post-treatment Follow-up Period 
(PTFP)
From 
Week -4 
to Day -1
Week 1
Dose 1 
From Dose 2
up to Unblinding
Week -1 
(Placebo 
subj. from 
PTFP)16
From 
Week N 
Dose 1 (subj.
allowed in 
the OLP)17
Subjects who 
did not 
complete 48 
weeks in 
DBTP 9
All subjects
regardless of 
treatment 
duration with 
IP10
End 
of 
Study
11
(+3 days)
Day 1
(+3 
days)
Day 1
(±3 days)
Dose 6
Day 8
(±3 
days)
Dose 6
Day 15
(±3 
days)
Weeks14
13, 19, 37, 
42
(± 7 days)
Weeks1
4 24 & 
48
(± 7 
days)
Week -1 
(- 5 days)
Day 1
(+5 days)
Weeks 913, 
19, 24, 37, 42 
& 48 after 
first dose, if 
not already 
done in 
DBTP
(±7 days)
9 wks 
after 
last 
dose
(±7 
days)
Every 24 
wks10
(±7 days)
At 
any 
time 
or 
End 
of 
Trial
11
ECOG performance 
status
6.1
6.3
X
-
-
-
-
-
-
X 
-
-
-
-
-
12-Lead 
electrocardiogram (local 
reading)
6.1
to
6.4
X
-
-
X 
-
-
-
X 
-
-
X
-
-
Echocardiography or 
MRI (same technique to 
be used throughout the 
study): to assess LVEF 
and TRV
6.1
to
6.4
X, if not 
done 
within 8 
weeks of 
ICF 
signature
-
-
-
-
-
X
X
Wk 144 (± 7 
days) if 
applicable
Wks 24 & 48 
-
-
-
Pregnancy testing2
6.1
to
6.4
X
X
X (every 
dose)
-
-
-
-
X (serum, 
central lab) 
X (local lab)
-
X
-
-
Menstrual status 
6.1
to
6.4
X
-
X
-
-
-
-
-
X
-
X
-
-
Hematology3 (by central 
lab Screening, predose 
Hb value by both local 
and central lab in DBTP, 
OLP and PTFP) 
6.1
to
6.4
X (at Wk 
-4 and Wk
-3 or Wk -
2)
X
X (every 
dose)
X 
X 
X
X
X (central 
lab)
X (local lab
and central 
lab)
X
X
-
-


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
59
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 3:
Table of Events (Continued)
Assessments
Ref.
Screening 
Period
Double-blind Treatment Period (DBTP)
(Luspatercept or Placebo)
Open-label Period (OLP)
(Luspatercept)
Post-treatment Follow-up Period 
(PTFP)
From 
Week -4 
to Day -1
Week 1
Dose 1 
From Dose 2
up to Unblinding
Week -1 
(Placebo 
subj. from 
PTFP)16
From 
Week N 
Dose 1 
(subj.
allowed in 
the OLP)17
Subjects who 
did not 
complete 48 
weeks in 
DBTP 9
All subjects
regardless of 
treatment 
duration with 
IP10
End 
of 
Study
11
(+3 days)
Day 1
(+3 
days)
Day 1
(±3 days)
Dose 6
Day 8
(±3 
days)
Dose 6
Day 15
(±3 
days)
Weeks14
13, 19, 37, 
42
(± 7 days)
Weeks
14 24, 48
& 120
(± 7 
days)
Week -1 
(- 5 days)
Day 1
(+5 days)
Weeks 913, 
19, 24, 37, 42 
& 48 after 
first dose, if 
not already 
done in 
DBTP
(±7 days)
9 wks 
after 
last 
dose
(±7 
days)
Every 24 
wks10
(±7 days)
At 
any 
time 
or 
End 
of 
Trial
11
Serum Chemistry Panel 
14 (predose, by central lab 
up to Week 48/Dose 17)
6.1
to
6.2
X
X
X (every 
dose up to 
Dose 17)
-
-
-
-
-
-
-
-
-
-
Serum chemistry panel 24
(predose, by central lab in 
the DBTP and OLP)
6.1
to
6.4
-
-
X (every 
4 doses 
after Wk 
48/
Dose 17)
-
-
-
-
X
X (every 4 
doses; central 
lab)
-
X
(centr
al)
-
-
Urinalysis8 by central lab
in the DBTP and local lab 
in the OLP; Local lab at 
Screening only if central 
lab results are not 
available on time
6.1
to
6.4
X
X
X (every 
4 doses 
from 
Dose 1: at 
Dose 5, 9, 
13 etc.)
-
-
-
-
X (local
lab)
X (every 4 
doses from 
Dose 1: at 
Dose 5, 9, 13 
etc: local lab)
-
X
(centr
al)
-
-


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
60
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 3:
Table of Events (Continued)
Assessments
Ref.
Screening 
Period
Double-blind Treatment Period (DBTP)
(Luspatercept or Placebo)
Open-label Period (OLP)
(Luspatercept)
Post-treatment Follow-up Period 
(PTFP)
From 
Week -4 
to Day -1
Week 1
Dose 1 
From Dose 2
up to Unblinding
Week -1 
(Placebo 
subj. from 
PTFP)16
From 
Week N 
Dose 1 
(subj.
allowed in 
the OLP)17
Subjects who 
did not 
complete 48 
weeks in 
DBTP 9
All subjects
regardless of 
treatment 
duration with 
IP10
End 
of 
Study
11
(+3 days)
Day 1
(+3 
days)
Day 1
(±3 days)
Dose 6
Day 8
(±3 
days)
Dose 6
Day 15
(±3 
days)
Weeks14
13, 19, 
37, 42
(± 7 days)
Weeks
14 24, 48
& 120
(± 7 
days)
Week -1 
(- 5 days)
Day 1
(+5 days)
Weeks 913, 
19, 24, 37, 42 
& 48 after 
first dose, if 
not already 
done in 
DBTP
(±7 days)
9 wks 
after 
last 
dose
(±7 
days)
Every 24 
wks10
(±7 days)
At 
any 
time 
or 
End 
of 
Trial
11
Serum erythropoietin 
(EPO), predose, by 
central lab
6.2
to
6.4
-
X
X (every 
4 doses 
from Dose 
1: at Dose 
5, 9, 13 
etc.)
-
-
-
-
-
X (every 4 
doses from 
Dose 1: at 
Dose 5, 9, 13 
etc.)
-
X 
only 
in 
DBTP
-
-
PK (predose on dosing 
day; serum collection; by 
central lab) 
6.5
-
X
X (Dose 
2, 4, and 
6, 8, 12, 
16 and 
every 6 
doses: at 
Dose 22, 
28, 34
etc.)
X 
X 
-
-
-
-
-
-
-
-
Anti-drug antibody 
(ADA)5
up to maximum 2 years 
from Dose 1 Day 1; by 
central lab
6.6
-
X
X (Dose 
2, 4 and 6; 
8, 12, 16
and every 
6 doses: at 
Dose 22, 
28, 34 
etc.)
-
-
-
-
-
X (if positive
in DBTP, 
every 6 
doses)5
-
-
X5 
-


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
61
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 3:
Table of Events (Continued)
Assessments
Ref.
Screening 
Period
Double-blind Treatment Period (DBTP)
(Luspatercept or Placebo)
Open-label Period (OLP)
(Luspatercept)
Post-treatment Follow-up Period 
(PTFP)
From 
Week -4 
to Day -1
Week 1
Dose 1 
From Dose 2
up to Unblinding
Week -1 
(Placebo 
subj. from 
PTFP)16
From 
Week N 
Dose 1 
(subj. 
allowed in 
the OLP)17
Subjects who 
did not 
complete 48 
weeks in 
DBTP 9
All subjects
regardless of 
treatment 
duration with 
IP10
End 
of 
Study
11
(+3 days)
Day 1
(+3 
days)
Day 1
(±3 days)
Dose 6
Day 8
(±3 
days)
Dose 6
Day 15
(±3 
days)
Weeks14
13, 19, 
37, 42
(± 7 days)
Weeks1
4 24 & 
48
(± 7 
days)
Week -1 
(- 5 days)
Day 1
(+5 days)
Weeks 913, 
19, 24, 37, 42 
& 48 after 
first dose, if 
not already 
done in 
DBTP
(±7 days)
9 wks 
after 
last 
dose
(±7 
days)
Every 24 
wks10
(±7 days)
At 
any 
time 
or 
End 
of 
Trial
11
MRI for LIC (mg/g dw) 
by T2* or R26 as per 
clinical site’s practice
6,
6.1
to
6.4
X, if not 
done 
within 12 
weeks of 
ICF 
signature
-
-
-
-
-
X
X
Wk 144 (± 7 
days), if 
applicable
Wks 24 & 48 
-
-
-
MRI for extramedullary 
masses6 – only subjects 
with medical history of 
masses 
6,
6.1
to
6.4
X
-
-
-
-
-
Wk 48 
X
Wk 144 (± 7 
days), if 
applicable
Wk 48 
-
-
-
MRI of spleen, if not 
splenectomized: MRI is 
the preferred technique 
for measuring the spleen 
size6
6,
6.1
to
6.4
X
-
-
-
-
-
X
X
Wk 144 (± 7 
days), if 
applicable
Wks 24 & 48 
-
-
-
Abdominal ultrasound for 
liver 
6,
6.1,
6.3
X
-
-
-
-
-
-
X 
-
-
-
-
-
DXA scan7 – total hip, 
lumbar spine (read 
locally)
6,
6.1
to
6.4
X, if not 
done 
within 20 
weeks of 
ICF 
signature
-
-
-
-
-
Wk 48
X
Wk 144 (± 7 
days), if 
applicable
Wk 48
-
-
-


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
62
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 3:
Table of Events (Continued)
Assessments
Ref.
Screening 
Period
Double-blind Treatment Period (DBTP)
(Luspatercept or Placebo)
Open-label Period (OLP)
(Luspatercept)
Post-treatment Follow-up Period 
(PTFP)
From 
Week -4 
to Day -1
Week 1
Dose 1 
From Dose 2
up to Unblinding
Week -1 
(Placebo 
subj. from 
PTFP)16
From 
Week N 
Dose 1 
(subj.
allowed in 
the OLP)17
Subjects who 
did not 
complete 48 
weeks in 
DBTP 9
All subjects
regardless of 
treatment 
duration with 
IP10
End 
of 
Study
11
(+3 days)
Day 1
(+3 
days)
Day 1
(±3 days)
Dose 6
Day 8
(±3 
days)
Dose 6
Day 15
(±3 
days)
Weeks14
13, 19, 
37, 42
(± 7 days)
Weeks
14 24, 48
& 120
(± 7 
days)
Week -1 
(- 5 days)
Day 1
(+5 days)
Weeks 913, 
19, 24, 37, 42 
& 48 after 
first dose, if 
not already 
done in 
DBTP
(±7 days)
9 wks 
after 
last 
dose
(±7 
days)
Every 24 
wks10
(±7 days)
At 
any 
time 
or 
End 
of 
Trial
11
6MWT
6.1
to
6.4
X (at wk -
4 and 
between 
wk -3 and 
-2)
-
X (every 
4 doses, 
eg, Dose 
1, 5, 9, 
etc.) 
-
-
-
X
X
Wk 144 (± 7 
days), if 
applicable
Wks 24 & 48 
X 
-
-
QoL questionnaire 
(NTDT PRO with 
additional PGI-S item), to 
be completed as daily 
diary in the evening 
6.1
to
6.3, 
6.8
X (daily 
over 7 
days 
before 
Dose 1 
Day 1)
X
X (daily 
up to wk 
24 and 
thereafter 
over 7 
days prior 
to dosing, 
at every 
other dose 
eg, Dose 
9, 11, 13,
etc.)
-
-
-
-
X (daily 
over 7 days 
before Dose 
1 Day 1)
X (7 days 
prior to 
dosing, at 
every other 
dose eg, Dose 
9, 11, 13, etc.)
X (over 7 
days prior to 
Wks 13, 24, 
37 & 48)
X
-
-
QoL questionnaires (SF-
36v2, FACIT-F and PGI-
C) to be completed before 
knowing the Hb test 
result on dosing visits
6.1
to
6.3, 
6.8
X
X
X (every 
other dose 
from 
Dose 3 
and: Dose 
5, 7, 9,
etc.)
-
-
-
-
X
X (every 
other dose 
from Dose 3,
5, 7, 9, etc.)
Wks 13, 24, 
37 & 48
X
-
-


EDMS Doc. Number: 24782414 - 21759172
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
63
ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Table 3:
Table of Events (Continued)
Assessments
Ref.
Screening 
Period
Double-blind Treatment Period (DBTP)
(Luspatercept or Placebo)
Open-label Period (OLP)
(Luspatercept)
Post-treatment Follow-up Period 
(PTFP)
From 
Week -4 
to Day -1
Week 1
Dose 1 
From Dose 2
up to Unblinding
Week -1 
(Placebo 
subj. from 
PTFP)16
From 
Week N 
Dose 1 
(subj. 
allowed in 
the OLP)17
Subjects who 
did not 
complete 48 
weeks in 
DBTP 9
All subjects
regardless of 
treatment 
duration with 
IP10
End 
of 
Study
11
(+3 days)
Day 1
(+3 
days)
Day 1
(±3 days)
Dose 6
Day 8
(±3 
days)
Dose 6
Day 15
(±3 
days)
Weeks14
13, 19, 
37, 42
(± 7 days)
Weeks1
4 24 & 
48
(± 7 
days)
Week -1 
(- 5 days)
Day 1
(+5 days)
Weeks 913, 
19, 24, 37, 42 
& 48 after 
first dose, if 
not already 
done in 
DBTP
(±7 days)
9 wks 
after 
last 
dose
(±7 
days)
Every 24 
wks10
(±7 days)
At 
any 
time 
or 
End 
of 
Trial
11
Healthcare Resource 
Utilization (HRU)
6.8
Record on ongoing basis, until 9 weeks after last dose 18
Serum ferritin (by central 
lab; also enter in the 
eCRF all values available 
in the medical history 
over 24 weeks prior to 
Dose 1 Day 1 in 
DBTP/OLP)
6.1
to
6.4
X
X
X (every 
dose)
-
-
-
-
X (central)
X (every 4 
doses by 
central)
Wks 24 & 48
X 
-
-
Leg ulcer evaluation (if 
applicable) 
6.1
to
6.4
X
Record on ongoing basis, until 9 weeks after last dose18
Serum GDF11 and other 
related biomarkers (by 
central lab; predose 
sample on dosing days)
6.7
-
X
X (Dose 
6, 8, and 
16)
X
X
-
-
-
X (every 4 
doses)
-
X15
-
-
Hemoglobin fractions 
(by central lab; predose 
sample on dosing days)
6.7
X
-
X (every 
dose)
X
X
-
-
-
X (every 4
doses)
-
X
-
-
Administer luspatercept / 
placebo every 21 days
and perform drug 
accountability
6.2
to
6.3, 
7.5
-
X
X
-
-
-
-
-
X
-
-
-
-


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ADA = anti-drug (ACE-536) antibody; ALT = alanine aminotransferase; ANC = absolute neutrophil count; AST = aspartate aminotransferase; BMD = bone mineral density; BUN 
= blood urea nitrogen; DBP = diastolic blood pressure; DBTP = Double-blind Treatment Period; dw = dry weight; DXA = dual-energy x-ray absorptiometry; ECOG = Eastern 
Cooperative Oncology Group; eCRF = electronic case report form; EPO= Serum erythropoietin; FACIT-F = Functional Assessment of Chronic Illness Therapy-Fatigue; GDF = 
growth differentiation factor; Hb = hemoglobin; HBsAG = Hepatitis B surface antigen; Hct = hematocrit; Hem = Hematology laboratory assessments; HRU = Health Resource 
Utilization; ICF = Informed consent form; IP= investigational product; lab = laboratory; LDH = lactic dehydrogenase; LIC= liver iron concentration; LVEF = left ventricular 
ejection fraction; MCH = Mean corpuscular hemoglobin; MCHC = mean corpuscular hemoglobin concentration; MCV = mean corpuscular volume; MRI = magnetic resonance 
imaging; 6MWT = 6 minute walk test; NTDT-PRO= Non-transfusion dependent β-thalassemia-patient reported outcome; OLP = Open-label Phase; PGI-C= Patient Global 
Impression of Change; PGI-S= Patient Global Impression of Severity; PK = Pharmacokinetic; PTFP = Post-treatment Follow-up Period; QOL = quality of life; RBC = red blood 
cell; RDW = red blood cell distribution width; Ref. = Section Reference; SAE = serious adverse event; SBP = systolic blood pressure; SF-36v2 = Medical Outcomes Study 36-
Item Short Form; SGOT = serum glutamic oxaloacetic transaminase; SGPT = serum glutamate pyruvate transaminase; Subj. = subjects; TRV = Tricuspid Regurgitant Velocity; 
WBC = white blood cell; Wk = week/Week; Wks = weeks.
1 Vital signs (including heart rate, seated blood pressure [DBP and SBP], and temperature) 2 separate seated blood pressure measurements obtained predose and 10 minutes apart.
2 Two pregnancy tests are required during screening for all female subjects of childbearing potential. One test is in serum (beta human chorionic gonadotropin (β-hCG) test with a 
minimum sensitivity of 25 mIU/mL must be performed within 4 weeks prior Dose 1 Day 1) and the second test can be either in urine or serum within 72 hours of Dose 1 Day 1. 
During DBTP and OLP, urine or serum pregnancy tests are allowed. 
3 Hematology assessment includes RBC count, Hb, Hct, MCV, MCH, MCHC, RDW, WBC count (corrected by erythroblast count) and differential count, absolute neutrophil 
count (ANC), and absolute lymphocytes count, platelet (all preceding parameters assessed by Central and Local Lab), and reticulocyte absolute values and circulating 
erythroblasts (nucleated RBC) counts (by Local Lab). On dosing days, hemoglobin levels and WBC count (corrected by erythroblast count) should be measured at predose 
locally and centrally in the DBTP to ensure the drug administration criteria are met and the modification rules are followed (Section 7.2). Note: Hb must be measured by central 
or local lab in the wk 13, 19, 24, 37, 42, and 48 (± 7 days) of DBTP regardless of dose delay and even if the IP is discontinued. Laboratory evaluations may be repeated more 
frequently if clinically indicated. If the dose is delayed, all planned Day 1 assessments should be performed as detailed in the Table of Events, Table 3, regardless of the dose 
delays, and appropriate samples sent to the central laboratory. Lab assessments causing the dose delay can be repeated locally until restarting the IP (See Section 6.2.1 for further 
details).
4 Serum chemistry panel 1 (calcium, magnesium, phosphorus, blood urea nitrogen [BUN], creatinine, creatinine clearance, microalbumin, total protein, alkaline phosphatase, 
bilirubin [total, non conjugated], AST/SGOT, ALT/SGPT, LDH and uric acid) performed by central laboratory up to Dose 17, included. After Dose 17, serum chemistry panel 2 
(creatinine, creatinine clearance, alkaline phosphatase, bilirubin [total, non conjugated] AST/SGOT, ALT/SGPT) will be performed every 4 doses by central lab in the DBTP and 
OLP, In the DBTP, local laboratory results are accepted at screening only if central lab results are not available in timely manner to allow eligibility assessment. Laboratory 
evaluations can be repeated more frequently, if clinically indicated. If the dose is delayed, all planned Day 1 assessments should be performed as detailed in the Table of Events, 
Table 3, and appropriate samples sent to the central laboratory, regardless of the dose delays. Lab assessments causing the dose delay can be repeated locally until restarting the 
IP (See Section 6.2.1 for further details).
5 For ADA test, additional blood draws are not needed if a time-matched PK sample will be collected up to maximum 2 years from Dose 1 Day 1 (central lab). The test will be 
performed using the serum collected for PK samples. In PTFP, ADA samples will be collected every 24 weeks until reaching 2 years from Dose 1 Day 1 of DBTP. After the 
unblinding, only ADA positive subjects will continue testing for up to 2 years from Dose 1 Day 1 of DBTP, if not already achieved the 2 years of testing. For subjects on placebo 
in the DBTP, ADA will be tested every 6 doses for up to 2 years from Dose 1 Day 1 of DBTP if ADA positive in the OLP, continue testing in PTFP every 24 weeks up to 
maximum 2 years from Dose 1 Day 1 of OLP.
6 MRI for LIC, extramedullary masses, and spleen should be performed using one MRI acquisition, if possible. MRI for extramedullary masses will be performed at baseline and 
at Week 48 only to subjects with medical history of masses. MRI of spleen, if not splenectomized: MRI is the preferred technique (same MRI acquisition of LIC, if possible) for 
measuring the spleen size. Alternatively, ultrasound can be used. Same technique to be used throughout the study.
7 DXA scan of the lumbar spine, total hip for bone mineral density (BMD).
8 Urinalysis: microalbumin, creatinine, microalbumin/creatinine ratio (morning void; central lab in the DBTP, and local lab in the OLP). In the DBTP, local lab at Screening is 
accepted only if central lab results are not available on time for eligibility evaluation. 
9 Subjects who did not complete 48 weeks in DBTP should perform visits at: 9 weeks after last dose and every 24 weeks after last dose up to End of Study, as all subjects 
regardless of treatment duration with IP, in addition they should perform visits at Weeks 13, 19, 24, 37, 42, and 48 after first dose, if not already done in the DBTP.


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10 Regardless of treatment duration with IP, all subjects should perform a visit at 9 weeks after last dose in the DBTP or OLP, and visits every 24 weeks at least 5 years from first 
dose of IP, or 3 years from last dose (whichever occurs later). After the study is unblinded, subjects who discontinue luspatercept in the DBTP may continue the PTFP in the 
OLP and subsequently in the rollover study.
11 End of Study visit should occur after the study is unblinded (ie, 48 weeks after last subject received the first dose of IP), and, at the End of Trial as defined in Section 3.3, 
whichever occurs later. Or, at the time a subject discontinues from the study.
12 Hepatitis B and C: perform HCV-RNA and HBsAG and/or HBV-DNA by central lab; local lab results are accepted only if central lab results are not available on time for 
eligibility evaluation.
13 Subjects are required to see the Investigator at least every 24 weeks to assess for malignancy and premalignancy, as per standard of care.
14 Visits at Weeks 13, 19, 24 37, 42 and 48 in DBTP should occur only if a dosing visit is not scheduled within ± 7 days of those respective weeks. Week 120 visit might be 
performed in the DBTP or in the OLP, if applicable (see footnote 17).
15 Serum GDF11 and other related biomarkers sample collection at 9 weeks after last dose to be performed only if not performed at Dose 16, and not performed within the last 12 
weeks.
16 Subjects on placebo who discontinued the treatment, but have been assessed as per protocol up to 48 weeks after the first dose of IP, and continued their participation in the 
PTFP until the time of unblinding, refer to Section 3.1.4, will perform Week -1 visit to re-assess some Inclusion/Exclusion criteria as per Section 3.1.3. Eligibility 
review/confirmation of selected Inclusion/Exclusion criteria will be performed by the Investigator using local lab data that will be reported in the eCRFs. Note: Week -1 
assessments in the OLP can be performed up to pre-Dose 1 Day 1, if needed.
17 All subjects on luspatercept treatment at the time of unblinding, as well as subjects on placebo in the DBTP or in the PTFP at the time of unblinding, if eligible as per 
Section 3.1.3, can be treated with luspatercept in the OLP starting from Dose 1 Week N (N = number of weeks in the DBTP since Dose 1 Week 1).
18 For early discontinuation subjects, these parameters to be reported up to 48 weeks Post Dose 1 Day 1 or Week 9 post last dose whichever is the later date. 


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6.
PROCEDURES
All protocol required assessments are listed in Section 5, Table 3 with an “X” indicating at which 
visits the assessments are to be performed. All data obtained from these assessments must be 
recorded in the subject’s source documentation.
Dosing visits during the DBTP must occur within ± 3 days of the scheduled day, except for Dose 
1 Day 1 which must occur within 3 days of the randomization via IRT. 
For assessments to be performed at certain weeks of the study periods (eg, magnetic resonance 
imaging [MRI] scans at Week 24 and Week 48), the site can apply a flexibility window as 
indicated in Table of Events, Table 3, to match the diagnostic assessment with the closest dosing 
visit.
During the PTFP, visits must occur within ± 7 days of the scheduled day.
Local and central laboratory assessments are specified in the Table of Events, Table 3, and in
sections below (Sections 6.1, 6.2, 6.2.1, 6.3). Moreover, local laboratory assessments are allowed 
in the following circumstances: when timely results are needed for randomization (with the 
exception of Hb levels), study treatment dosing decisions, assessments between clinic visits, and 
AE. Local laboratory data should be recorded in the eCRF if relevant to dose administration, 
modification, AE, or when no central laboratory results were obtained.
Procedures to be performed during each study period are detailed in the sections below and in the 
Table of Events, Table 3.
6.1.
Screening Period
Screening evaluations will be performed for all subjects to determine study eligibility. These 
evaluations must be completed within 4 weeks (+ 3 days administrative window to allow all 
laboratory results to be available) of randomization via IRT. Two visits should occur at Week -4 
and at Week -3 or Week -2 of the screening period, respectively. Hemoglobin levels and other 
laboratory results assessed by central laboratory must be available on time for evaluating the 
subject’s eligibility (refer to Table of Events, Table 3 for further information). Dose 1 Day 1 
should be scheduled within 3 days of randomization via IRT (it can be on the same day as 
randomization).
Waivers to the protocol will not be granted during the conduct of this trial, under any 
circumstances.
Screening laboratory values must demonstrate subject eligibility, but may be repeated within the 
screening window, if necessary, or subjects can be rescreened (see Section 6.1.1).
The following will be performed at Screening as specified in the Table of Events (Table 3), after 
informed consent has been obtained:

Assessment of inclusion/exclusion criteria for study eligibility

Demographics (date of birth, sex, race, and ethnicity [if allowed by local regulations])


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
Complete medical history: specific information regarding all diagnosed relevant medical 
conditions (occurring prior to screening) should be recorded including any additional 
details, as needed. 

β-thalassemia comorbidities assessment for NTDT severity score system

β-thalassemia genotype (ie, beta and alpha globin mutations should be assessed only if not 
already available)

Hepatitis B and hepatitis C (HCV-RNA and HBsAG and/or HBV-DNA) should be done 
only if not done already within 10 weeks before ICF signature)

Type of iron chelating therapy and period of treatment should be recorded in the related 
eCRF, at least 24 weeks of history before Dose 1 Day 1 in DBTP.

Prior medications/therapies: including those taken ≤ 28 days before screening, such as 
surgery, radiation, systemic or any other therapy for the subject’s disease. Prior ESA 
history (24 weeks prior to randomization) should also be recorded.

Prior procedures (including all procedures occurring ≤ 28 days before Screening)

Transfusion assessment – record RBC transfusion history (≥ 24 weeks of history prior to 
Dose 1 Day 1 in DBTP), including Hb levels prior to each transfusion, the number of units
and/or volumes transfused, the dates of transfusion. If available, the hematocrit (Hct) of 
the transfused unit should be collected, as well as the age when subject started regular 
transfusion. These retrospective data will be recorded in the subject’s electronic case 
report form (eCRF).

Adverse event assessment is starting after informed consent signature – record in the 
eCRF all AEs regardless of causality on an ongoing basis until 9 weeks after last dose
(refer to Section 10 for additional information)

Malignancy and premalignancy reporting from ICF signature up to End of Study -
continuous reporting the occurrence of any case regardless of causality (refer to 
Section 10.5.3 for additional information). Subjects are required to see the Investigator at 
least every 24 weeks to assess for malignancy and premalignancy, as per standard of care.

Vital signs (including seated blood pressure to assess diastolic blood pressure [DBP] and 
systolic blood pressure [SBP], temperature, and heart rate). Two separate measurements 
10 minutes apart of seated blood pressure must be obtained at predose.

Height (only at Screening) and weight 

Eastern Cooperative Oncology Group (ECOG) performance status (Appendix B)

12-lead electrocardiogram (ECG) – read locally

Echocardiography or MRI for left ventricular ejection fraction (LVEF) and tricuspid valve 
regurgitation velocity (TRV), if not done within 8 weeks of ICF signature 

Pregnancy testing is required for all female subjects of childbearing potential. Serum beta 
human chorionic gonadotropin (β-hCG) pregnancy test (which must be negative) with a 
minimum sensitivity of 25 mIU/mL must be performed within 4 weeks prior Dose 1 


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Day 1. A second pregnancy test is required this can be a urine or serum test within 72 
hours prior to Dose 1 Day 1. 

For female subjects: menstrual status

Hematology assessment includes: RBC count, Hb, hematocrit (Hct), mean corpuscular 
volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin 
concentration (MCHC), red blood cell distribution width (RDW), white blood cell (WBC)
count (corrected by erythroblast count) and differential count, absolute neutrophil count 
(ANC), and absolute lymphocytes count, platelets, (all previously listed assessments by 
central and local laboratory) absolute reticulocyte, and circulating erythroblasts (nucleated 
RBC) counts (by local laboratory) – 2 Hb measurements are required, by central 
laboratory at ≥ 1-week intervals at Week -4 and at Week -3 or Week -2.

Serum chemistry panel 1 (calcium, magnesium, phosphorus, blood urea nitrogen [BUN], 
creatinine, creatinine clearance, microalbumin, total protein, alkaline phosphatase, 
bilirubin [total, non conjugated], aspartate aminotransferase/serum glutamic oxaloacetic 
transaminase [AST/SGOT], alanine aminotransferase/serum glutamic pyruvic 
transaminase [ALT/SGPT], lactic dehydrogenase [LDH], and uric acid) - central 
laboratory assessment should be performed within 4 weeks prior to Dose 1 Day 1 (Local 
laboratory results are accepted at screening only if central laboratory results are not 
available in timely manner to allow eligibility assessment).

Urinalysis: microalbumin, creatinine, microalbumin/creatinine ratio (morning void) -
central laboratory assessment should be performed within 4 weeks prior to Dose 1 Day 1).
Local laboratory results at Screening are accepted only if central laboratory results are not 
available in timely manner to allow eligibility assessment.

MRI for LIC (mg/g dw) by T2* or R2, as per site’s practice (to be performed during 
Screening, only if subject has not had MRI performed within 12 weeks prior to signing 
ICF) 

MRI for extramedullary masses - only for subjects who have history of masses at baseline

MRI of spleen, if not splenectomized - MRI is the preferred technique (same MRI 
acquisition of LIC, if possible), the longest longitudinal dimension and width should be 
used. Alternatively, ultrasound can be used. Same technique to be used throughout the 
study 

Abdominal ultrasound for liver (only at screening) 

Bone imaging dual-energy x-ray absorptiometry [DXA] scan - total hip, lumbar spine 
(read locally) (DXA to be performed during Screening, only if not performed within 20 
weeks prior to signing ICF)

6MWT (6-minute walk test) at Week -4 and between Week -3 and Week -2

QoL questionnaire (NTDT - PRO with additional Patient Global Impression of Severity
[PGI-S] item for validation), to be completed as a daily diary over 7 days before Dose 1 
Day 1 in the evening


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
QoL questionnaires (SF-36 v2, FACIT-F, and Patient Global Impression of Change 
[PGI-C])

Healthcare Resource Utilization (HRU)

Serum ferritin: central laboratory assessment should be performed within 4 weeks prior to 
Dose 1 Day 1, also enter in the eCRF all values available in the medical history over 24 
weeks prior to Dose 1 Day 1 in DBTP.

Leg Ulcer evaluation (if applicable)

Hemoglobin fractions by central laboratory 
6.1.1.
Rescreening
If a subject fails screening and the Investigator wishes to rescreen this subject, a new subject 
number will be assigned by IRT. All screening assessments performed until the subject is 
declared to be a screen fail (at least 4 weeks after the ICF signature) can be entered in the eCRF 
pages under the new subject ID, if these are within the validity windows indicated below:

Urine (except urine pregnancy test), blood tests, ECGs, abdominal ultrasound for 
liver and MRI for spleen, if not splenectomized, MRI for extramedullary masses
(only for subjects who have history of masses at baseline), QoL questionnaires and
vital signs must all be performed within 4 weeks (+ 3 days) of randomization. If 
outside this 4-week window (+ 3 days), assessments must be repeated.

MRIs for LIC must be performed within 16 weeks of randomization. If outside the 
16-week window (+ 3 days flexibility window), the MRIs must be repeated.

DXA must be performed within 24 weeks of randomization. If outside the 24-week 
window (+ 3 days flexibility window), the DXA must be repeated.

Echocardiography or MRI for LVEF and TRV must be performed within 12 weeks of 
actual Dose 1 Day 1 date. If outside the 12-week window (+ 3 days flexibility 
window), assessment must be repeated.

Abnormal assessments that caused ineligibility of the subject during the initial 
screening must always be repeated.
6.2.
Double-blind Treatment Period
Subjects will begin the DBTP upon acknowledgement of eligibility by the Sponsor and will start 
the treatment with luspatercept or placebo within at least 4 weeks of signing the informed 
consent form (ICF). An administrative window of + 3 days is permitted on the Screening Period 
(refer to Table of Events, Table 3 for further information). Dose 1 Day 1 should be scheduled 
within 3 days of randomization via IRT (it can be on the same day as randomization). If 
screening assessments are performed within 72 hours of Dose 1 Day 1, safety laboratory 
assessments do not need to be repeated at Dose 1 Day 1, except hematology and blood chemistry 
assessments.
Subjects will receive their first subcutaneous (SC) dose of luspatercept or placebo on Day 1 of 
each dosing cycle.


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Treatment is administered every 21 days, and will occur as described in Section 7.2 and as 
reflected in the Table of Events, Table 3.
The following evaluations will be performed at the frequency specified in the Table of Events, 
Table 3. The evaluations should be performed prior to dosing on the visit day, unless otherwise 
specified:

β-thalassemia comorbidities assessment for NTDT severity score system

Iron chelating therapies: record on ongoing basis (as detailed in Section 6.1). 

 

Concomitant procedures - record on an ongoing basis.

Transfusion assessment - record transfusions on ongoing basis and include subject’s Hb
levels prior to each transfusion, the number of units transfused, the date(s) of 
transfusion(s). If available, record in the eCRF: the volume transfused in mL of each 
transfusion and Hct of the transfused units. 

Adverse event assessment - record all AEs regardless of causality on an ongoing basis 
until 9 weeks after last dose, only related SAEs to be reported until End of Study (refer to 
Section 10 for additional information)

Malignancy and premalignancy reporting from ICF signature up to End of Study -
continuous reporting the occurrence of any case regardless of causality (refer to 
Section 10.5.3 for additional information). Subjects are required to see the Investigator at 
least every 24 weeks to assess for malignancy and premalignancy, as per standard of care.

Vital signs (as detailed in Section 6.1) 

Weight 

12-lead electrocardiogram (ECG) – read locally

Echocardiography or MRI for left ventricular ejection fraction (LVEF) and tricuspid 
regurgitant velocity (TRV)

Female subjects of childbearing potential: Urine or serum medically supervised pregnancy 
test with a minimum sensitivity of 25 mIU/mL for FCBP at Day 1 of each dose 

For female subjects: menstrual status

Hematology assessments (as detailed in Section 6.1): predose by local and central 
laboratory; in case of AE, local and/or central laboratory to be used, if the dose is delayed 
refer to Section 6.2.1. Note: at Weeks 13, 19, 24, 37, 42, and 48 (± 7 days) hemoglobin 
should be measured by central or local laboratory regardless of dose delay and even if the 
IP is discontinued (see PTFP, Section 6.3).

Serum chemistry panel 1 (as detailed in Section 6.1): predose by central lab up to 
Dose 17, included. After Dose 17, serum chemistry panel 2 (creatinine, creatinine 
clearance, alkaline phosphatase, bilirubin [total, non conjugated] AST/SGOT, 
ALT/SGPT) will be performed every 4 doses. In case of AE, local and/or central 


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laboratory to be used. If the dose is delayed, the assessments are performed centrally and 
locally on the planned dosing visit when the dose is not given (refer to Section 6.2.1 for 
further details). 

Urinalysis: microalbumin, creatinine, microalbumin/creatinine ratio (as detailed in Section
6.1)

Serum erythropoietin: predose, analyzed by central laboratory

Pharmacokinetic (PK) sampling: predose, if at the dosing day; serum sample collection; 
analyzed by central laboratory (refer to Section 6.5)

Anti-drug antibody (ADA) sampling: analyzed by central laboratory (additional blood 
draws might not be needed if a time-matched PK sample is also collected)

MRI for LIC (mg/g dw) by T2* or R2, as per site’s practice

MRI for extramedullary masses - only for subjects who have history of masses at baseline

MRI for spleen, if not splenectomized - MRI is the preferred technique (same MRI 
acquisition of LIC, if possible), the longest longitudinal dimension and width should be 
used. Alternatively, ultrasound can be used. Same technique to be used throughout the 
study 

Bone imaging DXA scan - total hip, lumbar spine (read locally)

6MWT (6-minute walk test)

QoL Questionnaire (NTDT - PRO with PGI-S for validation): to be completed by the 
subjects as daily diary up to Week 24 and thereafter over 7 days prior to dosing, every 
other dose

QoL Questionnaires (SF-36 v2, FACIT-F, and PGI-C): to be completed by the subjects 
before knowing the Hb test result on dosing visits indicated in the Table of Events, 
Table 3

HRU

Serum ferritin 

Leg ulcer evaluation (if applicable)

GDF11 and other related biomarkers (sampling): central laboratory assessment

Hemoglobin fractions by central laboratory 

Administration of luspatercept/placebo on Day 1 of each dose cycle


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6.2.1.
Dose Delays in Double-blind Treatment Period
In case of dose delay (refer to Dose Delay, Dose Reduction, and Discontinuation Guidelines, 
Section 7.2.1.2), the clinical assessments and procedures to be performed include, but are not 
limited to:

All planned Day 1 assessments should be performed as detailed in the Table of 
Events, Table 3, and Section 6.2.1, and appropriate samples sent to the central 
laboratory, regardless of the reason for the dose delay.

If dose delay is due to increased hemoglobin level (refer to Table 5, Dose Delay, 
Dose Reduction and Discontinuation Guidelines, Section 7.2.1.2), perform 
hematology on Day 1 of dose delay by central and local laboratory and then at least 
weekly by local laboratory until the subject meets either the treatment administration 
criteria or treatment discontinuation criteria, as detailed in Sections 7.2.1.2, and 11.1.

If dose delay is due to AE, laboratory or vital signs abnormality (refer to Table 5, 
Dose Delay, Dose Reduction and Discontinuation Guidelines, Section 7.2.1.2), repeat 
any clinically indicated assessment by local laboratory at a frequency decided by the 
Investigator until the subject meets either the treatment administration criteria or 
treatment discontinuation criteria, as detailed in Section 7.2.1.3 and 11.1. 

PK/ADA samples should be performed on Day 1 of dose delay and before next dose. 

At the time of IP administration following a dose delay, perform the scheduled dosing 
visit assessments as detailed in the Table of Events, Table 3 and Section 6.2.1, 
regardless of the duration of the dose delays.
6.3.
Open Label Period
The assessments and procedures that will be performed during the Open Label Treatment Period 
are outlined in the Table of Events (see Table 3). An administrative window of ± 5 days is 
permitted.
Subjects who received placebo and are in PTFP at the time of unblinding will perform the 
following assessments and procedures on Week -1 of the OLP before accessing the OLP:

Assessment of eligibility: Inclusion criteria numbers 8-10 and exclusion criteria 
numbers 1-8, 10, 12-15, 17, 18 and 20 must be met at Dose 1 Day 1 of the OLP

Prior medications/therapies: at least 24 weeks prior to Dose 1 Day 1 of luspatercept

Prior procedures: at least 24 weeks prior to Dose 1 Day 1 of luspatercept

Transfusion assessment: at least 24 weeks RBC transfusion history prior to Dose 1 
Day 1 of the Open-label Phase of luspatercept including subject’s Hb levels prior to 
each transfusion, the number of units transfused, the date(s) of transfusion(s). If 
available, record in the eCRF: the volume transfused in mL of each transfusion and 
Hct of the transfused units.

Adverse event assessment –– starting after informed consent, record on an ongoing 
basis until 9 weeks after last dose as detailed in Section 6.1. and Section 10. 


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
Leg ulcer evaluation (if applicable), record on ongoing basis, until 9 weeks after last 
dose

Malignancy and Pre-Malignancy Reporting (refer to Section 6.1 and Section 10.5.3
for additional information)

HRU

ECOG performance status (Appendix B)

12-Lead Electrocardiogram – read locally

Females: Serum medically supervised pregnancy test with a minimum sensitivity of 
25 mIU/mL for FCBP at Day 1 Dose 1 of luspatercept

Hematology (as detailed in Section 6.1): predose by central and local lab

Serum chemistry panel 2 (as detailed in Section 6.1): predose by central lab

Urinalysis (as detailed in Section 6.1): by local lab microalbumin, creatinine, 
microalbumin/creatinine

Serum ferritin by central lab and enter in the eCRF all values available in the medical 
history over 24 weeks prior to Dose 1 Day 1 in OLP

Hepatitis B and hepatitis C (HCV-RNA and HBsAG and/or HBV-DNA) should be 
done only if not done already within 10 weeks before ICF signature)

Echocardiography or MRI (same technique to be used throughout the study): to assess 
LVEF and TRV 

MRI for LIC (mg/g dw) (as detailed in Section 6.1 ) 

MRI for extramedullary masses 

MRI or abdominal ultrasound for spleen measurement (as detailed in Section 6.1 ) 

Bone imaging DXA scan (as detailed in Section 6.1 ) 

Abdominal ultrasound for liver: to be performed up to 4 weeks before Dose 1 in the 
OLP 

6MWT (6-minute walk test)

QoL questionnaire (NTDT - PRO with additional Patient Global Impression of 
Severity [PGI-S] item for validation) to be completed as a daily diary over 7 days 
before Dose 1 Day 1 in the evening

QOL questionnaires (SF-36 v2, FACIT-F, and Patient Global Impression of Change 
[PGI-C])
All subjects, ie, subjects who are continuing the treatment with luspatercept after the 
unblinding of the study, and subjects who are starting the treatment with luspatercept after 
received placebo in DBTP, will perform the following assessments and procedures, according 
to Table 3:


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
Iron chelating therapies: record on an ongoing basis, until 9 weeks after last dose (as 
detailed in Section 6.1)

Concomitant medications/therapies: such as surgery, radiation, systemic or any other 
therapy for the subject’s disease - record on ongoing basis, until 9 weeks after last 
dose

Concomitant procedures - record on ongoing basis, until 9 weeks after last dose

Transfusion assessment - record on an ongoing basis, until 9 weeks after last dose (as 
detailed in Section 6.1)

Adverse event assessment –– starting after informed consent, record on an ongoing 
basis until 9 weeks after last dose as detailed in Section 6.1 and Section 10.

Leg ulcer evaluation (if applicable), record on ongoing basis, until 9 weeks after last 
dose

Malignancy and Pre-Malignancy Reporting (refer to Section 6.1 and Section 10.5.3
for additional information)

Vital signs (as detailed in Section 6.1)

Weight 

Female subjects of childbearing potential: Urine or serum medically supervised 
pregnancy test with a minimum sensitivity of 25 mIU/mL for FCBP at Day 1 of each 
dose

Female subjects of childbearing potential: menstrual status

Hematology (as detailed in Section 6.1)

ADA (if applicable) – refer to Section 6.6

HRU

Serum chemistry panel 2 (as detailed in Section 6.1): predose by central lab

Urinalysis (as detailed in Section 6.1): by local lab microalbumin, creatinine, 
microalbumin/creatinine.

Serum ferritin by central lab (as detailed in Section 6.2)

Serum erythropoietin (EPO): predose by central lab (as detailed in Section 6.2)

Serum GDF11 and other related biomarkers (by central lab; predose sample on dosing 
days) (as detailed in Section 6.7)

Hemoglobin fractions (by central lab; predose sample on dosing days) (as detailed in 
Section 6.7)

Administration of luspatercept on Day 1 of each dosing cycle

QoL Questionnaire (NTDT-PRO with PGI-S for validation): to be completed by the 
subjects 7 days prior to dosing, every other dose 


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
QoL Questionnaires (SF-36 v2, FACIT-F, and PGI-C): to be completed by the 
subjects before knowing the Hb test result on dosing visits indicated in Table 3

Only at Week 144 post first dose, if applicable, ie, for subjects who entered the OLP
prior to reaching Week 144 in the DBTP:
o
Echocardiography or MRI (same technique to be used throughout the study): 
to assess LVEF and TRV 
o
MRI for LIC (mg/g dw) (as detailed in Section 6.1) - only at Week 144 post 
first dose, if applicable
o
MRI for extramedullary masses - only at Week 144 post first dose, if 
applicable, only subjects with medical history of masses
o
MRI or abdominal ultrasound for spleen measurement (as detailed in 
Section 6.1) - only at Week 144 post first dose, if applicable
o
Bone imaging DXA scan (as detailed in Section 6.1) - only at Week 144 post 
first dose, if applicable
o
6MWT (6-minute walk test)- only at Week 144 post first dose, if applicable
6.3.1.
Dose Delays in Open Label Treatment Period
In case of dose delay as described in Table 5, Dose Delay, Dose Reduction and Discontinuation 
Guidelines, the clinical assessments and procedures to be performed include, but are not limited 
to:

All planned Day 1 assessments should be performed as detailed in the Table of 
Events, Table 3, and Section 6.3.

If dose delay is due to increased hemoglobin level (refer to Table 5, Dose Delay, 
Dose Reduction and Discontinuation Guidelines), perform hematology on Day 1 of 
dose delay and then at least weekly by local laboratory until the subject meets either 
the treatment administration criteria or treatment discontinuation criteria, as detailed 
in Sections 7.2.1.2, 7.2.1.3 and 11.1.

If dose delay is due to an AE, laboratory or vital signs abnormality (refer to Table 5, 
Dose Delay, Dose Reduction and Discontinuation Guidelines), repeat any clinically 
indicated assessment by local laboratory at a frequency decided by the Investigator 
until the subject meets either the treatment administration criteria or treatment 
discontinuation criteria, as detailed in Section 7.2.1.3 and 11.1. 
At the time of IP administration following a dose delay, perform the scheduled dosing 
visit assessments as detailed in the Table 3, and Section 6.3, regardless of the duration 
of the dose delays.
6.4.
Post-treatment Follow-Up Period
All subjects who discontinue the IP before the study is unblinded will move to the PTFP to be 
followed until the unblinding. After the study is unblinded, subjects who discontinue luspatercept 


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in the DBTP may continue 5 years from first dose of IP, or 3 years from last dose (whichever 
occurs later), to complete the Post-treatment Follow-up Period under the rollover protocol.
All subjects who discontinue luspatercept after the study is unblinded, during the OLP, will 
move to the PTFP to be followed until the End of Trial (see Section 3.3) and may continue 
5 years from first dose of IP, or 3 years from last dose (whichever occurs later), to complete the 
Post-treatment Follow-up Period under the rollover protocol
An administrative window of ± 7 days is permitted for visits.
In particular, subjects who discontinue the IP before completing 48 weeks in DBTP should 
perform the following visits: at 9 weeks after last dose, Weeks 13, 19, 24, 37, 42, 48 after first 
dose, if not already performed these visits at these time-points during the DBTP, and every 24 
weeks up to at least 5 years from first dose of IP, or 3 years from last dose (whichever occurs 
later)(see Table 3 and below for specific assessments to be performed at each visit). 
All subjects regardless of treatment duration with IP should perform the following visits: at 9 
weeks after last dose and every 24 weeks up to at least 5 years from first dose of IP, or 3 years 
from last dose (whichever occurs later)(see Table 3 and below for specific assessments to be 
performed at each visit). 
All subjects in PTFP, regardless of treatment duration with IP, will perform the following 
assessments at the above indicated visits as outlined in the Table of Events (see Table 3), which
includes but not limited to:

Iron chelating therapies - record on ongoing basis, until 9 weeks after last dose (as 
detailed in Section 6.2) 

Post-treatment medications/therapies: such as surgery, radiation, systemic or any other 
therapy for the subject’s disease - record on ongoing basis, until 9 weeks after last dose

Post-treatment procedures - record on ongoing basis, until 9 weeks after last dose

Transfusion assessment - record on ongoing basis, until 9 weeks after last dose (as 
detailed in Section 6.2) 

Adverse event assessment - record on an ongoing basis all AEs until 9 weeks after last 
dose, related SAEs to be reported until End of Study (refer to Section 10 for additional 
details) 

Malignancy and premalignancy reporting from ICF signature up to End of Study -
continuous reporting the occurrence of any case regardless of causality (refer
to Section 10.5.3 for additional information). Subjects are required to see the Investigator 
at least every 24 weeks to assess for malignancy and premalignancy, as per standard of 
care.

Leg ulcer (if applicable) record on ongoing basis, until 9 weeks after last dose

Vital signs (as detailed in Section 6.1) 

Weight 

12-Lead Electrocardiogram – read locally


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
Female subjects of childbearing potential: Urine or serum medically supervised pregnancy 
test with a minimum sensitivity of 25 mIU/mL for FCBP 

Female subjects of childbearing potential: menstrual status 

Hematology (as detailed in Section 6.1): use local and central laboratory

Serum chemistry (as detailed in Section 6.1): use central laboratory

Urinalysis (as detailed in Section 6.1): use local laboratory

Serum erythropoietin only in DBTP

ADA - refer to Section 6.6

6MWT (6-minute walk test)

QoL Questionnaire (NTDT – PRO with PGI-S): only at 9 weeks after last dose in the 
DBTP

QoL Questionnaire (SF-36v2,FACIT-F and PGI-C): only at 9 weeks after last dose in the 
DBTP

HRU

Serum Ferritin

GDF 11 and other related biomarkers analyzed by central laboratory at 9 weeks after last 
dose in the DBTP and if not performed at Dose 16 and not performed within the last 12 
weeks.

Hemoglobin fractions analyzed by central laboratory at 9 weeks after last dose in the 
DBTP
Subjects who discontinue the IP within 48 weeks of the first dose in the DBTP, in addition to the 
above assessments, will also perform the following assessments as indicated in Table 3), Table 
of Events:

β-thalassemia comorbidities assessment for NTDT severity score system

Echocardiography or MRI for left ventricular ejection fraction (LVEF) and tricuspid 
regurgitant velocity (TRV)

Hematology: Hb must be measured by central or local laboratory at week 13, 19, 24, 37, 
42 and 48 (± 7 days) after first dose of IP, if not already done in the DBTP at these
timepoints.

MRI for LIC (mg/g dw) by T2* or R2, as per site’s practice

MRI for extramedullary masses - only for subjects who have history of masses at baseline

MRI for spleen, if not splenectomized - MRI is the preferred technique (same MRI 
acquisition of LIC, if possible), the longest longitudinal dimension and width should be 
used. Alternatively, ultrasound can be used. Same technique to be used throughout the 
study 

Bone imaging DXA scan - total hip, lumbar spine (read locally)


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
6MWT

QoL Questionnaire (NTDT – PRO, SF-36v2, and FACIT-F) at Weeks 13, 24, 37, and 48 
after first dose in the DBTP
End of Study visit should occur after the study is unblinded (ie, 48 weeks after last subject has 
received the first dose of IP), and at the End of Trial as defined in Section 3.3, whichever occurs 
later. The End of study visit will occur at the time a subject discontinues from the study or 
transitions to rollover protocol. The following assessments will be performed, as outlined in the 
Table of Events (see Table 3):

Iron chelating therapies - record on an ongoing basis up to End of Study (as detailed in 
Section 6.1.1). 

Post-treatment medications/therapies - such as surgery, radiation, systemic or any other 
therapy for the subject’s disease - record on an ongoing basis up to End of Study.

Post-treatment procedures - record on an ongoing basis up to End of Study.

Transfusion assessment - as detailed in Section 6.1.1.

Adverse event assessment - refer to Section 10 for additional details

Malignancy and premalignancy reporting from ICF signature up to End of Study -
continuous reporting the occurrence of any case regardless of causality (refer to 
Section 10.5.3 for additional information). Subjects are required to see the Investigator to 
assess for malignancy and premalignancy, as per standard of care.

HRU

Leg ulcers
6.5.
Pharmacokinetics
Blood samples will be collected to analyze luspatercept concentrations in serum in all subjects.
At each PK time point, approximately 3 mL of blood will be collected, and serum prepared as 
described in the study reference guide. Blood samples for PK will be taken at the following visits 
during the study (also see Table 3):

DBTP: Doses 1 to 16: at predose (Dose 1 Day 1, must be collected before the first 
dose), Dose 2 Day 1, Dose 4 Day 1, Dose 6 Day 1, Dose 6 Day 8, Dose 6 Day 15, 
Dose 8 Day 1, Dose 12 Day 1, Dose 16 Day 1, and every 6 doses (at Dose 22, 28, 34,
etc.)
6.6.
Anti-Luspatercept Antibody
Blood samples will be collected for assessment of anti-drug antibodies (ADAs) against 
luspatercept in serum in all subjects. At each ADA time point, approximately 3 mL blood will be 
collected, and serum prepared as described in the study reference guide. However, during the 
first year of treatment, an additional blood draw is not needed for the ADA test, as the ADA test 
will be conducted utilizing the PK samples obtained at the same visit. Blood samples for ADA 
will be taken at the following visits during the study (also see Table 3):


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
DBTP: Doses 1 to 16: at predose (Dose 1 Day 1, must be collected before the first 
dose), Dose 2 Day 1, Dose 4 Day 1, Dose 6 Day 1, Dose 8 Day 1, Dose 12 Day 1, 
Dose 16 Day 1 and every 6 doses (at Dose 22, 28, 34 etc.) up to maximum 2 years 
from Dose 1 Day 1)

OLP: for subjects continuing treatment with luspatercept, only if positive in the 
DBTP, perform the ADA every 6 doses up to 2 years from Dose 1 Day 1 of the 
DBTP.

PTFP: every 24 weeks until the unblinding. After the unblinding, if ADA positive in 
the DBTP, continue testing every 24 weeks up to maximum 2 years from Dose 1 Day 
1 of DBTP. After the unblinding, only ADA positive subjects will continue testing for 
up to 2 years from Dose 1 Day 1 of DBTP, if not already achieved the 2 years of 
testing. For subjects on placebo in the DBTP, if ADA positive in the OLP, continue 
testing every 24 weeks up to maximum 2 years from Dose 1 Day 1 of OLP.
ADA sampling per Investigator’s or Sponsor’s discretion is allowed and should be recorded as 
an unscheduled visit.
Detailed procedures of ADA sample collection, processing, and shipping are provided in the 
study reference guide.
 
 
 
 
6.8.
Quality of Life

NTDT PRO – The NTDT-PRO V2.1 is a six-item PRO instrument to assess the 
severity of anemia-related symptoms associated with NTD β-thalassemia. It was 
designed as a daily electronic diary (eDiary) with recall of β-thalassemia related 
symptoms during the past 24 hours. The six items assess presence and severity of 
each symptom using a numerical rating scale (NRS) ranging from 0 (no) to 10 
(extreme). These six items are:

Tiredness (lack of energy) when not doing physical activity

Tiredness (lack of energy) when doing physical activity

Weakness (lack of strength) when not doing physical activity

Weakness (lack of strength) when doing physical activity

Shortness of breath when not doing physical activity

Shortness of breath when doing physical activity


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There are two domain scores. Tiredness/Weakness (T/W) domain score and Shortness 
of Breath (SoB). Furthermore, one Patient Global Impression of Severity item (PGI-
S) was administered as an addition to the measure at the same timepoints to be later 
used as an anchor for supporting evidence in determining the minimum clinical 
important difference (MCID). The item assesses the overall severity of Thalassemia 
symptoms in the past 24 hours on an 11-point numerical rating scale (anchors of 0 -
no symptoms and 10 - very severe symptoms).
Subjects will be asked to complete this disease specific quality of life questionnaire in 
the evening as daily diary over a 7 days period prior to Dose 1 Day 1 in the DBTP 
and daily up to Week 24. After that, subjects will complete this questionnaire over a 
7-day period prior to dosing, every other dose. If the IP is discontinued in the DBTP, 
the subjects will compete the questionnaire over a 7-day period prior to Weeks 13, 24, 
37, and 48 after first dose, and at 9 weeks after last dose, as detailed in Table 3. In the 
OLP, subjects will complete disease specific quality of life questionnaire daily up to 
Week 24 and thereafter over 7 days prior to dosing, at every other dose as detailed in 
Table 3.

SF-36 v2 – The SF-36 version 2 is a 36-item generic PRO questionnaire used to 
assess patient-reported HR-QoL outcomes. The SF-36 yields scores for eight domains 
of health: Physical Functioning (PF), Role-Physical (RP), Bodily Pain (BP), General 
Health (GH), Vitality (VT), Social Functioning (SF), Role Emotional (RE), and 
Mental Health (MH) as well as physical component summary (PCS) and mental 
component summary (MCS) scores. The SF-36 is scored such that higher scores 
reflect a better health state. For this study, a 7-day recall period is used.
Subjects will be asked to complete this quality of life questionnaire at Screening and 
every other dose (at Dose 1 Day 1, Dose 3 Day 1, Dose 5 Day 1 and thereafter) in the 
DBTP and at 9 weeks after last dose, as detailed in Table 3. The questionnaire must 
be always completed by the subjects before knowing the predose Hb test result. In the
OLP, subjects will complete this quality of life questionnaire every other dose as 
detailed in Table 3.

FACIT-F – The FACIT-Fatigue, is a multidimensional, self-report quality of life 
instrument. It consists of 27 core items, the Functional Assessment of Cancer Therapy 
- General (FACT-G) questionnaire, which assesses patient function in 4 domains: 
Physical, Social/Family, Emotional, and Functional well-being, which is further 
supplemented by a 13-item measure designed to capture cancer-related fatigue, the 
Fatigue subscale (FS). The items are measured on a response scale with five options 
(0 = not at all to 4 = very much) and has a 7-day recall period.
Subjects will be asked to complete this quality of life questionnaire at Screening and 
every other dose (at Dose 1 Day 1, Dose 3 Day 1, Dose 5 Day 1, and thereafter) in the 
DBTP and at 9 weeks after last dose, as detailed in Table 3. In the OLP, subjects will 
complete this quality of life questionnaire every other dose as detailed in Table 3. The 
questionnaire must be always completed by the subjects before knowing the predose 
Hb test result.


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
Patient Global Impression of Change (PGI-C) – The PGI-C is a seven-point single-
item measure assessing patient global impression of change in thalassemia symptoms 
since the start of the study. The response options are: (1) a great deal better; (2) much 
better; (3) a little better; (4) no change; (5) a little worse; (6) much worse; and (7) a 
great deal worse. Subjects will be asked to complete this quality of life questionnaire 
at Screening and every other dose (at Dose 1 Day 1, Dose 3 Day 1, Dose 5 Day 1 and 
thereafter) in the DBTP and at 9 weeks after last dose, as detailed in Table 3. The 
questionnaire must be always completed by the subjects before knowing the predose 
Hb test result. In the OLP, subjects will complete this quality of life questionnaire 
every other dose as detailed in Table 3.

Healthcare resource utilization (HRU) will be assessed on an ongoing basis at every 
visit until 9 weeks after last dose. The economic objective of this assessment is to 
characterize medical resource utilization among subjects treated with luspatercept as 
compared to subjects receiving placebo treatment. To facilitate this aim, medical 
HRU data will be collected. In addition, the number of transfusion events will be 
evaluated, as these relate directly to hours or days devoted to receiving RBC 
transfusions that can impact patients’ quality of life.
6.9.
Screen Failures
For all subjects classified as screen failures, the following information should be captured in the 
subject’s source documents and appropriate eCRF page(s): the date ICF was signed, 
demographics, the reason subject did not qualify for the study, and the Investigator’s signature 
for the eCRF pages. The adverse events experienced by screen failure subjects will be collected 
from the date of signing consent to the day the subject is confirmed as screen failure. Relevant 
information will also be recorded on the Screening Log.


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7.
DESCRIPTION OF STUDY TREATMENTS
7.1.
Description of Investigational Product(s)
Luspatercept will be provided by the Sponsor. Luspatercept for injection is formulated as a 
sterile, preservative-free, lyophilized cake/powder. Luspatercept for injection is available in 25 
mg and 75 mg vials, and when reconstituted, each consists of 50 mg/mL luspatercept in a 10 mM 
citrate buffer-based solution (10 mM citrate, pH 6.5, 9% sucrose, 0.02% polysorbate 80).
The recommended storage condition for luspatercept for Injection (25 mg/vial and 75 mg/vial; 
lyophilized powder formulation) is 2°C to 8°C. Reconstituted luspatercept in its original 
container closure system may be held for up to < 10 hours at 2°C to 8°C, however it should be 
administered at room temperature. It is recommended that the reconstituted luspatercept for 
injection be used immediately. If not used immediately, the total in-use time of the reconstituted 
luspatercept for injection, from reconstitution to administration, must not exceed 10 hours.
Samples of luspatercept drug product, held at the recommended storage condition, have been 
shown to be stable through the labeled shelf-life.
Placebo to be used in the study will be sterile normal saline (0.9% sodium chloride for injection) 
administered as a SC injection. Designated individuals will prepare the placebo syringes to 
match the active syringe. All staff except unblinded pharmacists and designated personnel will 
be blinded. The manufacturer’s directions for placebo storage and handling are to be followed, as 
are standard clinical practices for ensuring sterility of the placebo.
7.2.
Treatment Administration and Schedule
Luspatercept or placebo will be administered as a SC injection to subjects by the study staff at 
the clinical site and administration will be documented in the subject’s source record.
Subcutaneous injections will be given in the upper arm, thigh, and/or abdomen. Calculated doses 
requiring reconstituted volume greater than 1.2 mL should be divided into two separate similar 
volume injections across 2 separate body sites using the same anatomical location but on the 
opposite sites of the body (example left thigh and right thigh). The maximum volume per SC 
injection should not exceed 1.2 mL. The injection sites can be rotated according to Investigator’s
judgment, and the injections can be given in the following order as needed, for example: 1) right 
upper arm, 2) left upper arm, 3) right upper thigh, 4) left upper thigh.
In the DBTP, subjects will be assigned to be administered treatment as per one of the following 
regimens:

Luspatercept starting dose level 1.0 mg/kg SC every 21 days

Placebo SC every 21 days
In the OLP, subjects previously randomized to receive placebo will be assigned to be 
administered luspatercept starting dose level 1.0 mg/kg SC every 21 days and subjects previously 
randomized to luspatercept will continue on their last assigned dose.


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Treatment Administration Criteria: 
On dosing days, the following criteria must be met to allow the administration of the IP at the 
same dose level:
1. Predose Hb, measured on the dosing day (or, the day before dosing) by local laboratory is
< 11.5 g/dL (if predose Hb is ≥ 11.5 g/dL, check if subject was transfused within 21 days 
prior to current dose and review the pre-transfusion Hb, if this is < 11.5 g/dL, the subject 
can be dosed, otherwise, the dose should be delayed. If the first dose of IP (ie, Dose 1) 
should be administered, the dose should be delayed until Hb is < 11.5 g/dL, if subsequent 
doses should be administered (ie, Dose 2, Dose 3, etc.), the dose should be delayed until 
Hb is ≤ 11.0). Refer to Table 5, Dose Delay, Dose Reduction and Discontinuation 
Guidelines.
2. Increase of Hb < 2.0 g/dL compared to the Hb level on Day 1 of previous dose 
3. Absence of related adverse event ≥ Grade 2 according to NCI CTCAE criteria (Appendix 
C) on dosing day
4. Predose WBC count (corrected by erythroblast count) < 3 x baseline and absence of 
leukocytosis Grade 3 according to NCI CTCAE on dosing day.
5. Leukopenia, neutropenia and/or thrombocytopenia should be < Grade 3, as per NCI 
CTCAE criteria
6. No decrease of > 2 g/dL Hb from baseline (uninfluenced by transfusion) or subject 
becomes regularly transfused in combination with an unexplained shift from baseline 
(worsening) of ≥ 2 Grades leukopenia, neutropenia or thrombocytopenia.
Refer to Table 5 for dose modifications and dose delays guidelines.
IMPORTANT REMINDERS:
The above treatment administration criteria numbers 2, 3, and 4 should not be applied on Dose 1
Day 1 (except for the absence of leukocytosis) for the DBTP.
Hemoglobin not influenced by a transfusion, defined as Hb ≥ 21 days post-transfusion, should be 
considered to allow IP dose administration. If a transfusion occurred within 21 days prior to 
dosing, and predose Hb is ≥ 11.5 g/dL, the pre-transfusion Hb may be considered for dosing 
purposes.
If IP dose is delayed due to Hb level not meeting the above dose administration criteria, the Hb 
level should be retested on a weekly basis or at a frequency decided by the Investigator. 
Subjects must have Hb and WBC count assessed and results available prior to each IP
administration, therefore, local laboratory results can be used. However, in the DBTP central 
laboratory result will be used, when available, to confirm Investigator’s decision, therefore, 
blood samples will be also collected and shipped to the central laboratory, as detailed in the 
Table of Events, Table 3.
During the DBTP; local laboratory assessments are only allowed if specified in the Table of 
Events, Table 3, and Section 6 as well as in the following circumstances: eg, randomization, 
when timely results are needed (blood samples will be also collected and shipped to the central 
laboratory if required in the Table of Events, Table 3, and Section 6), study treatment dosing 


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decisions, dose delays, assessments between clinic visits and AE. Local laboratory data should 
be collected in the eCRF if relevant to dose administration, modification and AE, or when no 
central laboratory results were obtained.
Subjects must have blood pressure assessed prior to each IP administration. Blood pressure 
values should be confirmed by means of 2 readings obtained approximately 10 minutes apart 
with the patient seated for approximately 10 minutes prior to initial reading.
Refer to Table 5 for guidelines on dose modifications and dose delays.
7.2.1.
Dose Modifications: Dose Titration, Dose Reduction and Dose Delay
7.2.1.1.
Dose Titration
Subjects may be dose-escalated up to 1.25 mg/kg during the DBTP and OLP. The dose 
escalation criteria are defined as follows:

Dose escalation may be performed if at a constant dose level, the increase of mean 
hemoglobin (uninfluenced by transfusions, ie, > 21 days post-transfusion) over 2
cycles (6 weeks) is < 1.0 g/dL, compared to the baseline hemoglobin value (mean of 
2 values 1 week apart within 4 weeks of randomization);

Dose escalation may be performed if at a constant dose level, the increase of mean 
hemoglobin (uninfluenced by transfusions, ie, > 21 days post-transfusion) over 2 
cycles (6 weeks) is ≥1.0, but < 2.0 g/dL compared to the baseline hemoglobin value 
(mean of 2 values 1 week apart within 4 weeks of randomization).
Starting dose with dose reductions and escalations are presented in Table 4.
Note: Subjects who have been dose-reduced due to any related AE ≥ Grade 3, as indicated in 
Table 5, should not be dose-escalated during the DBTP. Although, following Investigator’s 
requests, the Sponsor may allow dose increase to the next higher dose level, after safety and 
efficacy data review.
Table 4:
Starting Dose Level with Dose Titrations
3rd Dose 
Reduction
(~ 25 %)
2nd Dose 
Reduction
(~ 25 %)
1st Dose 
Reduction
(~ 25 %)
Starting Dose 
Level
1st Dose
Increase
0.45 mg/kg
0.6 mg/kg
0.8 mg/kg
1.0 mg/kg
1.25 mg/kg
7.2.1.2.
Dose Delay and Dose Reduction 
Dose delay of IP from the planned dosing schedule may occur due to increased hemoglobin or 
adverse events considered related to luspatercept. Table 5 provides guidelines for dose 
modifications and dose delay. However, dose delay might occur at Investigator’s discretion for 
AEs regardless of causality, or for other reasons.
Hemoglobin not influenced by a transfusion (ie, Hb ≥ 21 days post-transfusion) should be 
considered for dose administration, dose delays, and discontinuation actions. Subjects can 
experience a dose reduction based on the change in mean Hb level (Hb not influenced by a 
transfusion) with respect to the last dose, as well as related adverse events, as detailed in Table 5.


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If a subject is experiencing a dose delay due to Hb increase, Hb measurement should occur every 
week. 
If dose delay is longer than 15 weeks from the last dose administered, including cases of elective 
surgery/hospitalization, the treatment should be discontinued. Assessments to be performed 
during the dose delay period are detailed in Section 6.
Celgene or its authorized representative should be notified of dose modification or interruption 
within 24 hours. 
Dose reduction and dose delay guidelines are detailed in Table 5. Treatment discontinuation 
criteria are detailed in Section 11.1.
Table 5:
Dose Delay, Dose Reduction, and Treatment Discontinuation Guidelines
Event at the Day of Dosing
Action
Any related AE = Grade 2a
Dose delayb until resolved to < Grade 1 or baseline
Any related AE ≥ Grade 3a
Dose delayb until resolved to < Grade 1 or baseline, and 
then reduce dose to the next lower dose level indicated in
Table 4
> 2 dose reductions due to related AEa
Discontinue treatmentd 
ΔHb ≥2.0 g/dL compared to the Hb on 
Day 1 of the previous dosec
Reduce dose to the next lower dose level indicated in 
Table 4
Hb ≥11.5 g/dLc
Dose delayc until Hb ≤ 11.0 g/dL 
Decrease of > 2 g/dL Hb from baseline
Hb (uninfluenced by transfusion)c or 
subject becomes regularly transfused in 
combination with an unexplained shift 
from baseline (worsening) of ≥ 2 grades 
leukopenia, neutropenia or 
thrombocytopeniag.
Dose delayc and repeat WBC, neutrophils and platelets 
weekly for two consecutive weeks. 
If WBC, neutrophils and platelets are resolved to ≤ Grade 1 
or baseline, continue with dosing at the same dose level. 
If WBC, neutrophils and platelets are Grade 2 and above 
baseline, then continue with dose delay until resolution to ≤ 
Grade 1 and evaluate for alternative explanations of 
cytopenia as per standard clinical practice. 
If shift (worsening) of ≥ 2 grades is maintained for ≥ 14 
days, or thrombocytopenia does not improve to Grade < 2 
within 14 days, and no alternative explanation is identified, 
then perform bone marrow assessment:
If hematologic malignancy is confirmed, discontinue 
treatmentd
If hematologic malignancy is not confirmed, then discuss 
future dosing with medical monitor.
WBC counte ≥2X baseline in the 
absence of an associated condition (eg, 
infection or concomitant corticosteroid 
use)
Subject can be dosed, repeat WBC count weekly:
If repeat WBC remains ≥ 2 X above baseline, Investigator 
should assess the cause of increase to exclude malignancy
as per standard clinical practice
If hematologic malignancy is confirmed, discontinue 
treatmentd


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Table 5:
Dose Delay, Dose Reduction, and Treatment Discontinuation Guidelines
(Continued)
Event at the Day of Dosing
Action
WBC counte ≥ 3X baseline
Dose delayb until WBC count < 3 X baseline, repeat WBC 
count weekly: 
Investigator should assess the cause of increase per 
standard clinical practice to exclude malignancy
If hematologic malignancy is confirmed, discontinue 
treatmentd
Grade ≥ 3 leukopenia, neutropenia 
and/or thrombocytopeniah
Dose delayc and, repeat assessment weekly for two 
consecutive weeks
Investigator should assess the cause of cytopenia per 
standard clinical practice to exclude hematologic 
malignancy.
If WBC, neutrophils and platelets resolved to ≤ Grade 1, 
continue with dosing at the same dose level. 
If WBC, neutrophils and platelets ≥ Grade 2 and above 
baseline sustained for ≥ 14 days perform bone marrow 
assessment.
If hematologic malignancy is confirmed, discontinue 
treatmentd
If hematological malignancy is not confirmed, then discuss 
future dosing with a medical monitor.
Grade 3 leukocytosisf
Discontinue treatmentd
AE: adverse event; Hb: hemoglobin; WBC: white blood cell.
a Possibly, probably, or definitely related.
b If dose delay is > 15 consecutive weeks, treatment should be discontinued.
c Based on the predose Hb value not influenced by transfusion (ie, > 21 days post-transfusion); Hb should be 
rechecked weekly during dose delay.
d Additional treatment discontinuation criteria are in Section 11.1.
e Central lab corrected WBC values should be used in DBPT and OLP for confirming the Investigator’s decision, 
which may be based on local results. Baseline = highest WBC value between Screening WBC and Dose 1 Day 1.
f Grade 3 leukocytosis (WBC > 100,000/mm3) should be confirmed by central lab values.
g Per CTCAE: Grade 1 leukopenia: < LLN – 3000/mm3; Grade 1 neutropenia: < LLN – 1500/mm3; Grade 1 
thrombocytopenia :< LLN – 75,000/mm3; Grade 2 Leukopenia: <3000 – 2000 / mm3; Grade 2 Neutropenia: 
< 1500 – 1000 / mm3; Grade 2 Thrombocytopenia :< 75,000 – 50,000 / mm3.
h Per CTCAE: Grade 3 leukopenia: < 2000 - 1000/mm3, neutropenia: < 1000 - 500/mm3 and thrombocytopenia: 
< 50,000 – 25,000/mm3.
7.2.1.3.
Overdose 
Overdose, as defined for this protocol, refers to luspatercept dosing only. On a per dose basis, an
overdose is defined as the following amount over the protocol-specified dose of luspatercept 
assigned to a given patient, regardless of any associated adverse events or sequelae.
SC 10% over the protocol-specified dose


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On a schedule or frequency basis, an overdose is defined as anything more frequent than the 
protocol required schedule or frequency. Complete data about drug administration, including any 
overdose, regardless of whether the overdose was accidental or intentional, should be reported in 
the eCRF. See Section 10.1 for the reporting of adverse events associated with overdose.
7.3.
Method of Treatment Assignment
The treatment assignment (randomization) will occur at the end of the Screening Period, once all 
the required screening procedures have been completed and all required data have been 
submitted to the Sponsor or its authorized representative. Upon receiving acknowledgment of 
subjects’ eligibility from the Sponsor or its authorized representative, subject can be assigned for 
treatment using IRT. This study will utilize the IRT for randomization. 
Designated research personnel at each investigational site will be assigned password protected, 
coded identification numbers which allows them to access the IRT to enroll subjects. For drug 
assignment at each dose start and in the event of any dose reduction, dose escalation site staff 
must contact IRT to record the new dose level and obtain the new study treatment assignment.
The relationship of the randomization number to the subject ID number will be described by a 
randomization algorithm. The randomization algorithm will be employed by the IRT system to 
assign a subject to a treatment based on the prespecified rules, such as double-blind study, 
stratified randomization with randomization ratio active versus placebo on a 2:1; subjects will be 
placed into the appropriate stratum per the responses/data entered/collected for questions 
collecting stratification and based on the combination of these data points, the IRT will place the 
subject in the next available slot within the appropriate stratum for that subject. The IRT will be 
utilized to ensure an equal weight central randomization based on block randomization method 
according to stratification factors defined in Section 3.1, Design of Study. The randomization 
number corresponds to a particular treatment arm within a stratum. The randomization number, 
by itself, will not unblind a user to the subject’s treatment. The randomization number should be 
coupled with all the unblinded code information, in order the subject to become unblinded.
7.4.
Packaging and Labeling
The label(s) for luspatercept will include Sponsor name, address and telephone number, the 
protocol number, IP name, dosage form and strength (where applicable), amount of IP per 
container, lot number, expiry date (where applicable), medication identification/kit number, 
dosing instructions, storage conditions, and required caution statements and/or regulatory 
statements as applicable. Additional information may be included on the label as applicable per 
local regulations.
7.4.1.
Blinding
For this trial, all subjects, study site staff, and Celgene Corporation representatives with the 
exception of designated individuals (eg, the pharmacist at the investigational site), will remain 
blinded to all treatment assignments until all subjects enrolled in the study have completed 48 
weeks of double-blind treatment or discontinue before reaching 48 weeks of double-blind 
treatment, whichever is the earlier date, or at the time the study is unblinded (per DMC 
recommendation) and the data base is locked.


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The designated site individual (for example the pharmacist) at the investigational site will use a 
syringe (that exactly matches the syringe used for reconstituted luspatercept) and sterile normal 
saline (0.9% sodium chloride for injection) to prepare a matching placebo. Thus, the designated 
site individual at the investigational site will be unblinded and will give Investigators and their 
staff luspatercept and placebo in a blinded manner.
Randomization, drug dispensing, dose reduction/escalation, and drug discontinuation will be 
accomplished by an IRT system. Authorized site personnel must contact the IRT for 
randomization, study drug assignment at the beginning of each cycle, to register dose reductions 
or escalations, and treatment discontinuation. Confirmation of each call will be sent to the 
investigational site and Celgene.
For emergency unblinding, refer to Section 12.2.
7.5.
Investigational Product Accountability and Disposal 
Accountability for study drug that is administrated during the course of the study is the 
responsibility of the Investigator or designee. Investigational clinical supplies must be received 
by a designated person at the clinical site and kept in a secure and temperature-controlled 
location. The investigational site must maintain accurate records demonstrating dates and 
amounts of study drug received, to whom it was administered (subject-by-subject accounting), 
and accounts of any luspatercept accidentally or deliberately destroyed or returned. Accurate 
recording of all IP administration will be made in the appropriate section of the subject’s eCRF
and source documents. Unless otherwise notified, all vials of study drug, both used and unused, 
must be saved for drug accountability. The used vials may be discarded, per the institution’s 
standard practice, after drug accountability has been completed by the monitor. The Investigator 
must return all unused vials of study drug to the Sponsor at the end of the study, or the study 
drug may be destroyed at the clinical site with the permission of the Sponsor. For either scenario, 
the outcome must be documented on the drug accountability log. The Sponsor will provide 
direction for the outcome of all unused vials.
Celgene (or designee) will review with the Investigator and relevant site personnel the process 
for investigational product return, disposal, and/or destruction including responsibilities for the 
site versus Celgene (or designee).
7.6.
Investigational Product Compliance
Study drug will be administered as a SC injection at the clinical site by the study staff.
Monitoring for patient compliance with the treatment regimen is therefore unnecessary.
Accurate recording of all IP administration will be made in the appropriate section of the 
subject’s eCRF and source documents.
The Investigator or designee is responsible for accounting for all IP that is administered during 
the course of the study.






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9.
STATISTICAL CONSIDERATIONS
9.1.
Overview
The proposed Phase 2 study is a double-blind, randomized, placebo- controlled, multicenter 
study to determine the efficacy and safety of luspatercept (ACE-536) versus placebo in adult 
NTDT subjects. The study populations, study endpoints, and statistical plan are discussed below.
9.2.
Study Population Definitions
Study populations to be analyzed are defined as follows: 
Intent-to-treat (ITT): The ITT population will consist of all randomized subjects regardless of 
whether or not the subject received IP.
Per Protocol Set (PPS): Subjects in the ITT who have taken at least 1 dose of IP and do not 
have major protocol deviations (details will be specified in the SAP prior to database [DB] lock).
The PPS population might be used in addition to ITT population to analyze primary and 
secondary endpoints as detailed in the SAP.
Safety: The safety population will consist of all subjects who were randomized and received at 
least 1 dose of IP. Subjects will be included in the treatment group corresponding to the IP they 
actually received.
QoL Evaluable Population: The QoL evaluable population consists of all subjects in the ITT 
population who completed the health-related QoL assessment at baseline (screening) and at least 
one postbaseline assessment visit.
Statistical methods to handle missing data will be described in the SAP. The SAP will also 
describe detailed rules for data handling and analysis (eg, time windows, visit-by-visit analysis, 
endpoint analysis, protocol deviations).
9.3.
Sample Size and Power Considerations
Based on the assumption of a targeted primary endpoint response rates at least 50% in the 
luspatercept group and 10% for the placebo group, and 2:1 randomization, a total sample size of 
150 (100 in the luspatercept group, 50 in the placebo group) will have at least 99% power to 
detect the difference between the 2 groups with a 2-sided alpha of 0.05 and assumed 10% drop-
out rate.
For NTDT-PRO T/W domain scores, assume the mean change from baseline scores at Week 24 
are 1.2 and 0.5 for luspatercept and placebo group, respectively, with a common standard 
deviation of 1.2, the statistical power will be 91%.
Randomization and Stratification
Subjects will be randomized to receive luspatercept or placebo at a 2:1 ratio. Randomization will 
be accomplished by an IRT to ensure timely registration and randomization. A stratified block 
randomization schedule will be implemented. Randomization will be stratified by:


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Baseline hemoglobin level

≥ 8.5 g/dL

< 8.5 g/dL
Baseline NTDT-PRO T/W score

≥3 points

< 3 points
9.4.
Background and Demographic Characteristics
Subjects’ age, height, weight, and baseline characteristics will be summarized using descriptive 
statistics, while gender, race, and other categorical variables will be provided using frequency 
tabulations by dose cohort. Prior transfusion history will be summarized. Medical history data 
will be summarized using frequency tabulations by Medical Dictionary for Regulator Activities 
(MedDRA) system organ class and preferred term. Beta-thalassemia diagnoses as well as RBC 
transfusion burden will be summarized using frequency tabulations.
9.5.
Subject Disposition
Subject disposition (analysis population allocation, entered, discontinued, along with primary 
reason for discontinuation) will be summarized using frequency and percent for both treatment 
and follow-up phases. A summary of subjects enrolled by site will be provided. Protocol 
deviations will be summarized using frequency tabulations.
9.6.
Efficacy Analysis
Primary analysis will be done after ALL subjects completed 48 weeks or discontinued earlier. 
Then at the end of the OLP phase, updated safety and efficacy analysis will be done.
9.6.1.
Primary Efficacy Analysis
The primary efficacy endpoint of this study is erythroid response, defined as an increase from 
baseline ≥1.0 g/dL in mean of hemoglobin values over a continuous 12-week interval from 
Weeks 13 to 24 in the absence of transfusions.
The Hb values within 21 days following a transfusion may be influenced by the transfusion and 
will be excluded from this analysis. Baseline Hb is the average of 2 or more Hb measurements at 
least 1 week apart within 4 weeks before Dose 1. For discontinued subjects who do not complete 
24 weeks of the Double-blind Treatment Period, Hb data will continue to be collected (see 
Table 3). 
The primary efficacy analysis will be performed on the ITT population. Cochran-Mantel-
Haenszel (CMH) test will be performed with randomization stratification factor(s) in the model 
to compare the treatment and placebo groups at 2-sided 0.05 level; the corresponding 95% 
confidence interval for odds ratio will also be provided.
For a subject, if the Hb average over Weeks 13-24 interval cannot be calculated due to missing 
data, the closest Hb 12-week average will be used.


EDMS Doc. Number: 24782414 - 21759172
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Sensitivity analysis: If a subject has less than 3 Hb measurements from Week 13 (-7 days) to 
Week 24 (+7 days), he/she will be considered as non-evaluable. Similar approach will be 
followed for Hb secondary endpoints over Weeks 37 to 48.
9.6.2.
Key Secondary Efficacy Analysis
The analyses of key secondary efficacy endpoints will be performed on the ITT population. The 
three key secondary endpoints are as follows:
1)
Mean change from baseline in NTDT-PRO Tiredness and Weakness (T/W) domain score 
over a continuous 12-week interval from Week 13 to Week 24. 
2)
Mean change from baseline in mean of hemoglobin values over a continuous 12-week 
interval from Week 13 to Week 24 in the absence of transfusions.
3)
Proportion of subjects who have an increase from baseline ≥1.0 g/dL in mean of 
hemoglobin values over a continuous 12-week interval from Week 37 to Week 48 in the absence
of transfusions.
To control the overall Type 1 error rate for three key secondary endpoints, the testing procedure 
will be implemented strictly in order: after the result from the primary efficacy analysis in the 
ITT population shows statistical significance, the key secondary endpoint 1 will be tested next. 
The key secondary endpoint 2 will be tested only if the test results for both primary endpoint and 
the key secondary endpoint 1 are significant. The key secondary endpoint 3 will be tested only if 
the test results for primary endpoint and the key secondary endpoints 1 and 2 are all significant. 
The details of the multiplicity control will be specified in the SAP.
9.6.2.1.
NTDT-PRO (T/W Domain) Mean Change Between Weeks 13 to 24
Mean NTDT-PRO (T/W domain) change from baseline over a 12-week window between Weeks 
13 to 24 will be analyzed using analysis of covariance (ANCOVA) method with treatment group
and randomization stratification factor(s) in the model score as covariates.
9.6.2.2.
Hemoglobin Mean Change Between Weeks 13 to 24 
Mean Hemoglobin change from baseline over 12-week window between Weeks 13 to 24 during 
the treatment period will be analyzed using ANCOVA method with treatment group and
randomization stratification factor(s) in the model value as covariates.
9.6.2.3.
Hemoglobin Response Between Weeks 37 to 48
Hemoglobin responder between Weeks 37 to 48, defined as an increase from baseline ≥1.0 g/dL 
in mean of hemoglobin values over a continuous 12-week interval from Weeks 37 to 48 in the 
absence of transfusions.
The CMH test will be performed with randomization stratification factor(s) in the model to 
compare the luspatercept and placebo groups at 2-sided 0.05 level; the corresponding 95% 
confidence interval for odds ratio will also be calculated.
Analysis similar to the primary analysis will be performed.


EDMS Doc. Number: 24782414 - 21759172
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9.6.3.
Secondary Efficacy Analysis
9.6.3.1.
FACIT-F Fatigue Subscale: Mean Change from Baseline between Weeks 13 to 
24 and Weeks 37 to 48
Mean FACIT-F Fatigue subscale change from baseline over a 12-week window between Weeks 
13 to 24 will be analyzed using ANCOVA method with treatment group, randomization 
stratification factor(s) in the model and baseline FACIT-F Fatigue subscale score as covariates.
Mean change from baseline for Weeks 37 to 48 will be analyzed similarly.
9.6.3.2.
NTDT-PRO SoB Domain: Mean Change from Baseline between Weeks 13 to 24 
and Weeks 37 to 48
Mean NTDT-PRO SoB Domain from baseline over a 12-week window between Weeks 13 to 24 
will be analyzed using ANCOVA method with treatment group, randomization stratification 
factor(s) in the model and baseline NTDT-PRO SoB scores covariates. Similar analysis will be 
performed for Weeks 37 to 48.
9.6.3.3.
Hemoglobin Mean Change Between Weeks 37 to 48
Mean Hemoglobin change from baseline over 12-week window between Weeks 37 to 48 during 
the treatment period will be analyzed using ANCOVA method with treatment group, 
randomization stratification factor(s) in the model as covariates.
9.6.3.4.
NTDT-PRO (T/W Domain) Mean Change Between Weeks 37 to 48
Mean NTDT-PRO (T/W domain) change from baseline over a 12-week window between Weeks 
37 to 48 will be analyzed using analysis of covariance (ANCOVA) method with treatment group,
randomization stratification factor(s) in the model as covariates.
9.6.3.5.
Definition of NTDT-PRO Minimum Clinical Important Difference (MCID) and 
Responder Definition (RD)Thresholds
The minimum clinical important difference (MCID) is the amount of difference in a PRO 
measure between treatment groups in a clinical trial that will be interpreted as a treatment 
benefit. The responder definition (RD) threshold is the individual subject score change over a 
predetermined time period that will be interpreted as a treatment benefit. In case of MCID and 
RDRD thresholds for the NTDT-PRO will be primarily determined with longitudinal anchor-
based methods prior to database lock and unblinding using data collected over a 12-week 
window between Weeks 13 to 24. Distribution-based methods will also be used as additional 
supporting evidence. Anchors to be considered include the PGI-C, PGI-S, SF-36v2 Vitality and 
Physical Functioning scales, and FACIT-F score. PGI-S is included as an extra item
administered at the end of each NTDT-PRO assessment (see Section 6.8).
After the database lock and unblinding, statistical analysis will be performed for unblinded data. 
Proportion of subjects with a decrease from baseline ≥ RD in mean NTDT-PRO T/W score, over 
Weeks 13 to 24 and Weeks 37 to 48 in the luspatercept group will be compared with the placebo 
group. The CMH test will be used with baseline NTDT-PRO T/W category ≥3 versus < 3 as the 
stratum to compare the response rates between the 2 groups. The corresponding 95% confidence 
interval for odds ratio will also be provided.


EDMS Doc. Number: 24782414 - 21759172
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Protocol ACE-536-B-THAL-002
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9.6.3.6.
FACIT-F Fatigue Subscale: Response at Weeks 13 to 24 and Weeks 37 to 48
Proportion of subjects with an increase from baseline ≥ 3 in mean FACIT-F Fatigue subscale
(FS) score, over Weeks 13 to 24 and Weeks 37 to 48 in the luspatercept group will be compared 
with the placebo group. The CMH test will be used with baseline FACIT-F Fatigue subscale
category ≥37 versus < 37 as the stratum to compare the response rates between the 2 groups. 
The corresponding 95% confidence interval for odds ratio will also be provided. 
Similar analysis will be performed for Weeks 37 to 48.
9.6.3.7.
SF-36 v2: Mean Change from Baseline at Week 24 and Week 48
The SF-36 Version 2.0 (acute condition with 1-week recall period) is a self-administered 
instrument consisting of 8 multi-item scales that assess 8 health domains: Physical functioning, 
Role-Physical, Bodily Pain, General Health, Vitality, Social functioning, Role-Emotional, and 
Mental Health. Two overall summary scores (Physical Component and Mental Component) can 
also be obtained. 
Summary statistics for the PCS and MCS norm-based scores, as well as change from baseline in 
these scores, will be assessed at Weeks 12, 24, 36, and 48. Scoring for the SF-36 and methods to 
address missing values will be accomplished according to directions provided by the instrument 
developers.
A mixed effect repeated measure model will be used with subjects as the random effect. The 
model includes the change from baseline scores up to Week 24 and 48 as the outcome, and 
treatment group assignment, time, baseline scores, randomization stratification factor(s), time-
by-baseline score, and time-by-treatment group assignment in the model. If any of the interaction 
terms are not significant, it will be excluded from the final model.
9.6.3.8.
LIC / ICT: Responder Analysis at Week 24 and Week 48
There are 3 scheduled LIC measurements for each subject: baseline, Weeks 24 and 48. For 
subjects who discontinued before 48 weeks the LIC and ICT data may be collected in the PTFP.
ICT daily dosing data will be collected during the study.
At Week 24 or Week 48, a LIC/ICT responder will be defined as one of the following:

Baseline LIC (by MRI) ≥3 mg/g dw: ≥20% reduction in LIC, OR, ≥33% decrease in 
ICT daily dose

Baseline LIC < 3 mg/g dw: no increase in LIC > 1 mg/g dw AND not starting 
treatment with ICT or no increase in ICT daily dose ≥33%, if on ICT at baseline
CMH test will be performed with baseline ICT use (Yes, No) and randomization stratification 
factor(s) as the strata adjusted to compare the luspatercept and placebo groups at 2-sided 0.05 
level; the corresponding 95% confidence interval for odds ratio will also be calculated. 
9.6.3.9.
Serum Ferritin: Mean Change from Baseline at Week 24 and Week 48
Serum ferritin change from baseline at Week 24 will be analyzed using ANCOVA method with 
treatment group and randomization stratification factor(s) in the model and baseline Serum 
ferritin as the covariate.


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If the normality assumption is significantly deviated, the nonparametric Wilcoxon rank-sum test 
will be used instead.
Mean change at week 48 will be analyzed similarly.
9.6.3.10.
Liver Iron Concentration: Mean Change from Baseline at Weeks 24 and 48
LIC mean change from baseline will be analyzed using ANCOVA method with treatment group 
and randomization stratification factor(s) in the model and baseline Liver Iron Concentration as 
the covariate. 
LIC mean change from Baseline at Week 48 will be analyzed similarly.
9.6.3.11.
Transfusion Free for 24 and 48 weeks
Proportion of subjects who receive no RBC transfusions from Week 1 to Week 24 will be 
compared between the 2 treatment groups using CMH test with randomization stratification 
factor(s) adjusted.
Similarly, proportion of subjects who receive no RBC transfusion from Week 1 to Week 48 will 
be compared between the 2 treatment groups using CMH test with stratification factor(s)
adjusted.
9.6.3.12.
Duration of Mean Hemoglobin Increase from Baseline ≥1.0 g/dL
Descriptive statistics will be generated for the duration of mean hemoglobin increase for each 
treatment group. Kaplan-Meier method will be used for censored subjects. No statistical test will 
be performed to compare the 2 groups.
The duration will start from the first day of the first rolling 12-week window that achieves mean 
Hb increase from baseline ≥1.0 g/dL. It will end with the last day of the last consecutive rolling 
12-week window that maintains mean Hb increase from baseline ≥1.0 g/dL.
9.6.3.13.
6MWT: Mean Change at Week 24 and 48
Mean changes from baseline at Weeks 24 and 48 will be analyzed using ANCOVA method with 
treatment group and randomization stratification factor(s) in the model and baseline 6MWT 
value as the covariate. In addition, subgroup of subjects with baseline 6MWT ≤450 meter will 
be performed. 
Mean changes from baseline at Week 48 will be analyzed similarly.
9.6.3.14.
Proportion of Mean Hemoglobin Increase From Baseline ≥1.5 g/dL at Week 13 
to 24
Similar to the primary efficacy analysis, the proportion of subjects who have an increase from 
baseline ≥1.5 g/dL in mean of hemoglobin values over a continuous 12-week interval from 
Week 13 to Week 24 will be performed on the ITT population. Cochran-Mantel-Haenszel 
(CMH) test will be performed with randomization stratification factor(s) in the model to compare 
the treatment and placebo groups at 2-sided 0.05 level.


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9.7.
Safety Analysis
All safety analyses will be performed on the safety population. Full details will be included in 
the SAP. Planned data presentations and analyses include the following:

Adverse events will be coded using MedDRA. Adverse event listings will include the 
verbatim term and the MedDRA preferred term. Treatment-emergent adverse events will 
be summarized by system organ class and preferred term. Treatment-emergent adverse 
events leading to death or to discontinuation from treatment, TEAEs classified as NCI 
CTCAE (version 4.0) all grades or grade 3/4 TEAEs, related to investigational product, 
and serious TEAEs will be summarized separately.

Clinical laboratory results will be summarized descriptively by treatment group. 
Clinically significant hematologic and non-hematologic laboratory abnormalities will be 
listed and summarized according to the NCI CTCAE by treatment group.

Physical examination data and vital sign measurements, including body weight, will be 
listed for each subject at each visit. Descriptive statistics for vital signs, both observed 
values and changes from baseline, will be summarized by treatment group.
9.8.
Interim Analysis
No Interim analysis is planned.
9.9.
Timing of Analyses
9.9.1.
Primary Clinical Study Report 
Clinical study report (CSR) will include safety and efficacy parameters with a cut-off date at the 
time when all subjects enrolled in the DBTP have completed 48 weeks in the study or 
discontinued earlier (ie, at the time of the unblinding of the study, whichever occurs later). Thus, 
the primary and secondary analysis will be conducted after all required information is available 
for these endpoints (ie, after all subjects have completed 48 weeks in the study or discontinued 
earlier). With this cut-off date and upon the data base lock the study will be unblinded.
9.9.2.
Final Clinical Study Report 
The final CSR will include efficacy and safety data at the time of the End of the Trial (EOT 
definition in Section 3.3).
The final analyses will be conducted on efficacy and safety endpoints as applicable after 
Week 48.
9.10.
Other Topics
9.10.1.
Pharmacokinetic Analysis
Population PK analysis will be performed using nonlinear mixed effect modeling. Concentration 
data obtained from this study and other studies will be combined to develop a population PK 
model that describes the PK exposure data and the associated variability. Subject-specific factors 
(demographics, baseline characteristics, markers for organ function, anti-luspatercept antibodies, 


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etc.) will be explored as covariates for their potential to influence luspatercept PK parameters.
Empiric individual Bayesian estimates of PK parameters will be generated using the final 
population PK model. With these individual parameter estimates and appropriate measures of 
luspatercept exposure (AUC, maximum concentration of drug [Cmax], or other exposure metrics 
of interest) will be computed for each subject.
The relationship between serum luspatercept exposure and the selected efficacy/safety endpoints 
or biomarkers of interest will be explored as appropriate.
 
 
 
 
 
 
 
 
 
9.10.3.
Data Monitoring Committee (DMC)
The independent DMC will be comprised of experts in the β-thalassemia not involved in ACE-
536- B-THAL-002 protocol, an Independent Cardiologist, an Independent Statistician, and may 
include additional ad hoc members. Representatives of Sponsor will be attending the blinded part 
of the DMC meetings. The Sponsor will not have access to the unblinded data. 
During the course of the study, the DMC will review unblinded safety data regularly, or ad-hoc, 
as well as safety and efficacy data in accordance with the guidelines for the preplanned analyses.
An independent third party will prepare the reports of aggregate data summaries and individual 
subject data listings, as appropriate, to the DMC members for each scheduled or ad-hoc meeting.
The DMC responsibilities, authorities, and procedures will be detailed in the DMC charter, 
which will be endorsed by the DMC prior to the first data review meeting. 
Operational details for the DMC will be detailed in the DMC charter.
9.10.4.
Scientific Steering Committee (SSC)
A Scientific Steering Committee (SSC) will be established by charter for this study. The SSC
will be comprised of study Investigators, Sponsor representatives, and may include additional ad 
hoc members. The SSC will review blinded data. The SSC will serve in an advisory capacity to 
the Sponsor. The SSC will advise and recommend to the Sponsor:

Changes to the protocol or conduct of the study based upon emerging clinical or 
scientific data from this and/or other studies.


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
Procedures to ensure the safety of subjects and integrity of study data.

Procedures to meet the overall goals and objectives of the study.
The SSC responsibilities, authorities, and procedures will be detailed in the SSC charter, which 
will be endorsed by the SSC prior to the first data review meeting.
Operational details for the SSC will be detailed in a separate SSC charter. 
Note: The SSC is separate from the DMC.


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10.
ADVERSE EVENTS
10.1.
Monitoring, Recording and Reporting of Adverse Events
An AE is any noxious, unintended, or untoward medical occurrence that may appear or worsen 
in a subject during the course of a study. It may be a new intercurrent illness, a worsening 
concomitant illness, an injury, or any concomitant impairment of the subject’s health, including 
laboratory test values (as specified by the criteria in Section 10.3), regardless of etiology. Any 
worsening (ie, any clinically significant adverse change in the frequency or intensity of a pre-
existing condition) should be considered an AE. A diagnosis or syndrome should be recorded on
the AE page of the eCRF rather than the individual signs or symptoms of the diagnosis or 
syndrome. 
Abuse, withdrawal, sensitivity, or toxicity to an investigational product should be reported as an 
AE. Overdose, accidental or intentional, whether or not it is associated with an AE should be 
reported on the overdose eCRF. (See Section 7.2.1.3 for the definition of overdose.) Any sequela 
of an accidental or intentional overdose of an investigational product should be reported as an 
AE on the AE eCRF. If the sequela of an overdose is an SAE, then the sequela must be reported 
on an SAE report form and on the AE eCRF. The overdose resulting in the SAE should be 
identified as the cause of the event on the SAE report form and eCRF but should not be reported 
as an SAE itself.
In the event of overdose, the subject should be monitored as appropriate and should receive 
supportive measures as necessary. There is no known specific antidote for luspatercept overdose. 
Actual treatment should depend on the severity of the clinical situation and the judgment and 
experience of the treating physician.
All subjects will be monitored for AEs during the study. Assessments may include monitoring of 
any or all of the following parameters: the subject’s clinical symptoms, laboratory, pathological, 
radiological or surgical findings, physical examination findings, or findings from other tests 
and/or procedures.
All AEs regardless of causality will be recorded by the Investigator from the time the subject 
signs informed consent until 9 weeks after the last dose of IP as well as those SAEs made known 
to the Investigator at any time thereafter that are suspected of being related to IP. In addition, 
SAEs that are suspected to be related to the IP as well as new malignancies or premalignancies 
regardless of causality (see Section 10.5.3) will be recorded by the Investigator until at least 5 
years from first dose of IP, or 3 years from last dose (whichever occurs later) in this study or 
rollover study. Information will be collected at scheduled visits (see Table of Events, Table 3,
and Section 6.3 for additional information. AEs and SAEs will be recorded on the AE page of the 
eCRF and in the subject’s source documents. All SAEs must be reported to Celgene Drug Safety 
within 24 hours of the Investigator’s knowledge of the event by facsimile, or other appropriate 
method, using the SAE Report Form, or approved equivalent form.


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10.2.
Evaluation of Adverse Events
A qualified Investigator will evaluate all adverse events as to: 
10.2.1.
Seriousness 
An SAE is any AE occurring at any dose that:

Results in death;

Is life-threatening (ie, in the opinion of the Investigator, the subject is at immediate 
risk of death from the AE);

Requires inpatient hospitalization or prolongation of existing hospitalization 
(hospitalization is defined as an inpatient admission, regardless of length of stay);

Results in persistent or significant disability/incapacity (a substantial disruption of the 
subject’s ability to conduct normal life functions);

Is a congenital anomaly/birth defect;

Constitutes an important medical event.
Important medical events are defined as those occurrences that may not be immediately life
threatening or result in death, hospitalization, or disability, but may jeopardize the subject or 
require medical or surgical intervention to prevent one of the other outcomes listed above.
Medical and scientific judgment should be exercised in deciding whether such an AE should be 
considered serious.
Events not considered to be SAEs are hospitalizations for:

a standard procedure for protocol therapy administration. However, hospitalization or 
prolonged hospitalization for a complication of therapy administration will be 
reported as an SAE. 

routine treatment or monitoring of the studied indication not associated with any 
deterioration in condition.

the administration of blood or platelet transfusions as a routine treatment of the 
studied indication. However, hospitalization or prolonged hospitalization for a 
complication of such transfusion remains a reportable SAE.

a procedure for protocol/disease-related investigations (eg, surgery, scans, endoscopy, 
sampling for laboratory tests, bone marrow sampling). However, hospitalization or 
prolonged hospitalization for a complication of such procedures remains a reportable 
SAE.

hospitalization or prolongation of hospitalization for technical, practical, or social 
reasons, in absence of an AE.

a procedure that is planned (ie, planned prior to start of treatment on study); must be 
documented in the source document and the eCRF. Hospitalization or prolonged 
hospitalization for a complication remains a reportable SAE.


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
an elective treatment of or an elective procedure for a pre-existing condition, 
unrelated to the studied indication, that has not worsened from baseline. 

emergency outpatient treatment or observation that does not result in admission, 
unless fulfilling other seriousness criteria above.
If an AE is considered serious, both the AE page/screen of the eCRF and the SAE Report Form 
must be completed.
For each SAE, the Investigator will provide information on severity, start and stop dates, 
relationship to the IP, action taken regarding the IP, and outcome.
10.2.2.
Severity/ Intensity
For both AEs and SAEs, the Investigator must assess the severity/ intensity of the event. 
The severity/intensity of AEs will be graded based upon the subject’s symptoms according to the 
current active minor version of the Common Terminology Criteria for Adverse Events (CTCAE, 
Version 4.0); 
http://ctep.cancer.gov/protocolDevelopment/electronic_applications/ctc.htm#ctc_40
AEs that are not defined in CTCAE should be evaluated for severity/intensity according to the 
following scale:

Grade 1 = Mild – transient or mild discomfort; no limitation in activity; no medical 
intervention/therapy required

Grade 2 = Moderate – mild to moderate limitation in activity, some assistance may be 
needed; no or minimal medical intervention/therapy required

Grade 3 = Severe – marked limitation in activity, some assistance usually required; 
medical intervention/therapy required, hospitalization is possible

Grade 4 = Life-threatening – extreme limitation in activity, significant assistance 
required; significant medical intervention/therapy required, hospitalization or hospice 
care probable

Grade 5 = Death - the event results in death
The term “severe” is often used to describe the intensity of a specific event (as in mild, moderate,
or severe myocardial infarction); the event itself, however, may be of relatively minor medical 
significance (such as severe headache). This criterion is not the same as “serious” which is based 
on subject/event outcome or action criteria associated with events that pose a threat to a subject’s 
life or functioning.
Seriousness, not severity, serves as a guide for defining regulatory obligations.
10.2.3.
Causality
The Investigator must determine the relationship between the administration of the IP and the 
occurrence of an AE/SAE as Not Suspected or Suspected as defined below:
Not suspected:
a causal relationship of the adverse event to IP administration is 
unlikely or remote, or other medications, therapeutic 


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interventions, or underlying conditions provide a sufficient 
explanation for the observed event.
Suspected:
there is a reasonable possibility that the administration of IP 
caused the adverse event. ‘Reasonable possibility’ means there 
is evidence to suggest a causal relationship between the IP and 
the adverse event.
Causality should be assessed and provided for every AE/SAE based on currently available 
information. Causality is to be reassessed and provided as additional information becomes 
available.
If an event is assessed as suspected of being related to a comparator, ancillary or additional IP 
that has not been manufactured or provided by Celgene, please provide the name of the 
manufacturer when reporting the event.
10.2.4.
Duration
For both AEs and SAEs, the Investigator will provide a record of the start and stop dates of the 
event.
10.2.5.
Action Taken
The Investigator will report the action taken with IP as a result of an AE or SAE, as applicable 
(eg, discontinuation, interruption, or dose reduction of IP, as appropriate) and report if 
concomitant and/or additional treatments were given for the event. 
10.2.6.
Outcome
The Investigator will report the outcome of the event for both AEs and SAEs.
All SAEs that have not resolved upon discontinuation of the subject’s participation in the study 
must be followed until recovered (returned to baseline), recovered with sequelae, or death (due to 
the SAE).
10.3.
Abnormal Laboratory Values
An abnormal laboratory value is considered to be an AE if the abnormality:

results in discontinuation from the study;

requires treatment, modification/ interruption of IP dose, or any other therapeutic 
intervention; or

is judged to be of significant clinical importance, eg, one that indicates a new disease 
process and/or organ toxicity or is an exacerbation or worsening of an existing 
condition.
Regardless of severity grade, only laboratory abnormalities that fulfill a seriousness criterion 
need to be documented as a serious adverse event.
If a laboratory abnormality is one component of a diagnosis or syndrome, then only the diagnosis 
or syndrome should be recorded on the AE page/screen of the eCRF. If the abnormality was not 


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a part of a diagnosis or syndrome, then the laboratory abnormality should be recorded as the AE. 
If possible, the laboratory abnormality should be recorded as a medical term and not simply as an 
abnormal laboratory result (eg, record thrombocytopenia rather than decreased platelets).
10.4.
Pregnancy
All pregnancies or suspected pregnancies occurring in either a female subject of childbearing 
potential or partner of childbearing potential of a male subject are immediately reportable events.
10.4.1.
Females of Childbearing Potential:
Females of childbearing potential (FCBPs) are advised to avoid becoming pregnant during study 
and for 12 weeks after the last dose of IP. Pregnancies and suspected pregnancies (including 
elevated βhCG or positive pregnancy test in a female subject of childbearing potential regardless 
of disease state) occurring while the subject is on IP, or within 9 weeks of the subject’s last dose 
of IP, are considered immediately reportable events. Investigational product is to be discontinued 
immediately. The pregnancy, suspected pregnancy, or positive pregnancy test must be reported to 
Celgene Drug Safety immediately by email, phone or facsimile, or other appropriate method, 
using the Pregnancy Initial Report Form, or approved equivalent form.
The female subject may be referred to an obstetrician-gynecologist or another appropriate 
healthcare professional for further evaluation.
The Investigator will follow the female subject until completion of the pregnancy and must 
notify Celgene Drug Safety immediately about the outcome of the pregnancy (either normal or 
abnormal outcome) using the Pregnancy Follow-up Report Form or approved equivalent form.
If the outcome of the pregnancy was abnormal (eg, spontaneous abortion), the Investigator 
should report the abnormal outcome as an AE. If the abnormal outcome meets any of the serious 
criteria, it must be reported as an SAE to Celgene Drug Safety by facsimile, or other appropriate 
method, within 24 hours of the Investigator’s knowledge of the event using the SAE Report 
Form, or approved equivalent form.
All neonatal deaths that occur within 28 days of birth should be reported, without regard to 
causality, as SAEs. In addition, any infant death after 28 days that the Investigator suspects is 
related to the in utero exposure to the IP should also be reported to Celgene Drug Safety by 
facsimile, or other appropriate method, within 24 hours of the Investigator’s knowledge of the 
event using the SAE Report Form, or approved equivalent form.
10.4.2.
Male Subjects
If a female partner of a male subject taking IP becomes pregnant, the male subject taking IP 
should notify the Investigator, and the pregnant female partner should be advised to call their 
healthcare provider immediately.
Males are advised to use a latex condom during any sexual contact with FCBP prior to starting 
investigational product and continue for 12 weeks following the last dose of IP, even if he has 
undergone a successful vasectomy.


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10.5.
Reporting of Serious Adverse Events
Any AE that meets any criterion for an SAE requires the completion of an SAE Report Form in 
addition to being recorded on the AE page/screen of the eCRF. All SAEs must be reported to 
Celgene Drug Safety within 24 hours of the Investigator’s knowledge of the event by facsimile, 
or other appropriate method (eg, via email), using the SAE Report Form, or approved equivalent 
form. This instruction pertains to initial SAE reports as well as any follow-up reports.
The Investigator is required to ensure that the data on these forms is accurate and consistent. This 
requirement applies to all SAEs (regardless of relationship to IP) that occur during the study 
(from the time the subject signs informed consent until 9 weeks after the last dose of IP in the 
DBTP and/or OLP) or any SAE made known to the Investigator at any time thereafter that are 
suspected of being related to IP. Serious adverse events occurring prior to treatment (after 
signing the ICF) will be captured.
The SAE report should provide a detailed description of the SAE and include a concise summary 
of hospital records and other relevant documents. If a subject died and an autopsy has been 
performed, copies of the autopsy report and death certificate are to be sent to Celgene Drug 
Safety as soon as these become available. Any follow-up data should be detailed in a subsequent 
SAE Report Form, or approved equivalent form, and sent to Celgene Drug Safety.
Where required by local legislation, the Investigator is responsible for informing the Institutional 
Review Board/Ethics Committee (IRB/EC) of the SAE and providing them with all relevant 
initial and follow-up information about the event. The Investigator must keep copies of all SAE 
information on file including correspondence with Celgene and the IRB/EC.
10.5.1.
Safety Queries
Queries pertaining to SAEs will be communicated from Celgene Drug Safety to the site via 
facsimile or electronic mail. The response time is expected to be no more than five (5) business 
days. Urgent queries (eg, missing causality assessment) may be handled by phone.
10.5.2.
Thromboembolic Events
The occurrence of a thromboembolic event will be monitored as an event of interest and should 
be included as part of the assessment of adverse events throughout the course of the study. 
Investigators are to report the occurrence of thromboembolic events as SAEs to Celgene Drug 
Safety within 24 hours, regardless of causal relationship to IP, occurring at any time for the 
duration of the study, from the time of signing the ICF through 9 weeks post last dose. Beyond 
9 weeks post last-dose period, only related thromboembolic events should be reported. 
10.5.3.
Malignancy and Premalignancy Reporting
The occurrence of a new malignancy or premalignant lesion will be monitored as an event of 
interest and should be included as part of the assessment of adverse events throughout the course 
of the study. Investigators are to report the development of any new malignancy or premalignant 
lesion as a serious adverse event, regardless of causal relationship to IP, occurring at any time for 
the duration of the study, from the time of signing the ICF up to and including 5 years from first 
dose of IP, or 3 years from last dose (whichever occurs later).


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Events of new malignancy, premalignant lesions (excluding benign tumors or benign neoplasia) 
are to be reported to Celgene Drug Safety within 24 hours of the Investigator’s knowledge of the 
event by facsimile, or other appropriate method, using the SAE Report Form, or approved 
equivalent form and must be considered an “Important Medical Event” even if no other serious 
criteria apply; these events must also be documented in the appropriate page(s) of the eCRF and 
subject’s source documents. Documentation of the diagnosed malignancy must be provided at 
the time of reporting as a serious adverse event (eg, any confirmatory histology or cytology 
results, x-rays, CT scans, etc.).
Malignancies or cancerous tumors are lesions capable of invading into adjacent tissues, and may 
be capable of spreading to distant tissues. A benign tumor has none of those properties.
Malignancy or cancer is characterized by anaplasia, invasiveness, and metastasis.
Premalignant or precancerous lesions refer to a state of disordered morphology of cells that is 
associated with an increased risk of cancer. If left untreated, these conditions may lead to cancer. 
Such conditions are usually either dysplasia or benign neoplasia (and the dividing line between 
those is sometimes blurry). Sometimes the term “precancer” is used to describe carcinoma in 
situ, which is a noninvasive cancer that has not progressed to an aggressive, invasive stage. Not 
all carcinoma in situ will progress to invasive disease.
Premalignant lesions are morphologically atypical tissue which appears abnormal under 
microscopic examination, and in which cancer is more likely to occur than in its apparently 
normal counterpart.
10.6.
Expedited Reporting of Adverse Events
For the purpose of regulatory reporting, Celgene Drug Safety will determine the expectedness of 
events suspected of being related to luspatercept based on the Investigator Brochure.
In the United States, all suspected unexpected serious adverse reactions (SUSARs) will be 
reported in an expedited manner in accordance with 21 CFR 312.32.
For countries within the European Economic Area (EEA), Celgene or its authorized
representative will report in an expedited manner to Regulatory Authorities and Ethics 
Committees concerned, suspected unexpected serious adverse reactions (SUSARs) in accordance 
with Directive 2001/20/EC and the Detailed Guidance on collection, verification and 
presentation of adverse reaction reports arising from clinical trials on investigational products for 
human use (ENTR/CT3) and also in accordance with country-specific requirements.
In addition, any report of hematologic malignancy regardless of causality in the luspatercept arm 
will be reported to the Regulatory Authorities in an expedited manner, if requested.
Celgene or its authorized representative shall notify the Investigator of the following
information:

Any AE suspected of being related to the use of IP in this study or in other studies
that is both serious and unexpected (ie, SUSAR);

Any finding from tests in laboratory animals that suggests a significant risk for
human subjects including reports of mutagenicity, teratogenicity, or carcinogenicity.


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Where required by local legislation, the Investigator shall notify his/her IRB/EC promptly of 
these new serious and unexpected AE(s) or significant risks to subjects.
The Investigator must keep copies of all pertinent safety information on file including 
correspondence with Celgene and the IRB/EC. (See Section 14.3 for record retention 
information).
Celgene Drug Safety Contact Information:
For Celgene Drug Safety contact information, please refer to the Serious Adverse Event Report 
Form Completion Guidelines or to the Pregnancy Report Form Completion Guidelines.


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11.
DISCONTINUATIONS
11.1.
Treatment Discontinuation
The following events are considered sufficient reasons for discontinuing a subject from the 
investigational product(s):

Adverse Event(s):

Any serious AE assessed as related to luspatercept

Any AE ≥ Grade 3 assessed to be related to luspatercept if the event causes a 
treatment delay for > 15 consecutive weeks

Grade 3 leukocytosis

If a subject experiences > 2 dose reductions due to related AE

Diagnosis of any new malignancy

Withdrawal of consent - An indication that a study participant has removed itself 
from the study treatment

Death 

Lost to follow-up - the loss or lack of continuation of a subject to follow-up

Pregnancy

If dose is delayed for more than 15 weeks due to AEs, and including case of elective 
surgery/hospitalization

Undergo splenectomy

Other: Different than the one(s) previously specified or mentioned
The reason for discontinuation of treatment should be recorded in the eCRF and in the source 
documents.
The decision to discontinue a subject from treatment remains the responsibility of the treating 
physician, which will not be delayed or refused by the Sponsor. However, prior to discontinuing 
a subject, the Investigator may contact the Medical Monitor and forward appropriate supporting
documents for review and discussion.
11.2.
Study Discontinuation
The following events are considered sufficient reasons for discontinuing a subject from the study
and perform the End of Study assessments:

Screen failure

Completed study per protocol

Withdrawal of consent - An indication that a study participant has removed itself 
from the study

Death 


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
Lost to follow-up - The loss or lack of continuation of a subject to follow-up

Other: Different than the one(s) previously specified or mentioned
The reason for End of Study should be recorded in the eCRF and in the source documents.


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12.
EMERGENCY PROCEDURES
12.1.
Emergency Contact
In emergency situations, the Investigator should contact the responsible Clinical Research 
Physician/Medical Monitor or designee by telephone at the number(s) listed on the Emergency 
Contact Information page of the protocol (after title page).
In the unlikely event that the Clinical Research Physician/Medical Monitor or designee cannot be 
reached, please contact the global Emergency Call Center by telephone at the number listed on 
the Emergency Contact Information page of the protocol (after title page). This global 
Emergency Call Center is available 24 hours a day and 7 days a week. The representatives are 
responsible for obtaining your call-back information and contacting the on-call Celgene/contract 
research organization Medical Monitor, who will then contact you promptly.
Note: The back-up 24-hour global emergency contact call center should only be used if you are 
not able to reach the Clinical Research Physician(s) or Medical Monitor or designee for 
emergency calls. 
12.2.
Emergency Identification of Investigational Products (Emergency 
Unblinding)
The blind must not be broken during the course of the study unless in the opinion of the 
Investigator, it is absolutely necessary to safely treat the subject. If it is medically imperative to 
know what IP the subject is receiving, IP should be temporarily discontinued if, in the opinion of 
the Investigator, continuing IP can negatively affect the outcome of the subject’s treatment.
The decision to break the blind in emergency situations remains the responsibility of the treating 
physician, which will not be delayed or refused by the Sponsor. However, the Investigator may
contact the Medical Monitor prior to breaking the blind to discuss unblinding, mainly in the 
interest of the subject. 
The Investigator should ensure that the code is broken only in accordance with the protocol. The 
Investigator should promptly notify the Medical Monitor of the emergency unblinding and the 
reason for breaking the blind, which should be clearly documented by the Investigator in the 
subject’s source documentation.
Emergency unblinding should only be performed by the Investigator through the IRT.


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13.
REGULATORY CONSIDERATIONS
13.1.
Good Clinical Practice
The procedures set out in this study protocol pertaining to the conduct, evaluation, and 
documentation of this study are designed to ensure that Celgene, its authorized representative, 
and Investigator abide by Good Clinical Practice (GCP), as described in International Council for 
Harmonisation (ICH) Guideline E6 and in accordance with the general ethical principles outlined 
in the Declaration of Helsinki. The study will receive approval from an IRB/EC prior to 
commencement. The Investigator will conduct all aspects of this study in accordance with 
applicable national, state, and local laws of the pertinent regulatory authorities.
13.2.
Investigator Responsibilities
Investigator responsibilities are set out in the ICH Guideline for Good Clinical Practice and in 
the local regulations. Celgene staff or an authorized representative will evaluate and approve all 
Investigators who in turn will select their staff.
The Investigator should ensure that all persons assisting with the study are adequately informed 
about the protocol, amendments, study treatments, as well as study-related duties and functions, 
including obligations of confidentiality of Celgene information. The Investigator should maintain 
a list of Sub-investigators and other appropriately qualified persons to whom he or she has 
delegated significant study-related duties.
The Investigator is responsible for keeping a record of all subjects who sign an informed consent 
form (ICF) and are screened for entry into the study. Subjects who fail screening must have the 
reason(s) recorded in the subject’s source documents.
The Investigator, or a designated member of the Investigator’s staff, must be available during 
monitoring visits to review data, resolve queries and allow direct access to subject records (eg, 
medical records, office charts, hospital charts, and study-related charts) for source data 
verification. The Investigator must ensure timely and accurate completion of CRFs and queries.
The information contained in the protocol and amendments (with the exception of the 
information provided by Celgene on public registry websites) is considered Celgene confidential 
information. Only information that is previously disclosed by Celgene on a public registry 
website may be freely disclosed by the Investigator or its institution, or as outlined in the Clinical 
Trial Agreement. Celgene protocol, amendment and IB information is not to be made publicly 
available (for example on the Investigator’s or their institution’s website) without express written 
approval from Celgene. Information proposed for posting on the Investigator’s or their 
institution’s website must be submitted to Celgene for review and approval, providing at least 5 
business days for review.
At the time results of this study are made available to the public, Celgene will provide 
Investigators with a summary of the results that is written for the lay person. The Investigator is 
responsible for sharing these results with the subject and/or their caregiver as agreed by the 
subject.


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13.3.
Subject Information and Informed Consent
The Investigator must obtain informed consent of a subject and/or a subject’s legal representative 
prior to any study related procedures.
Documentation that informed consent occurred prior to the study subject’s entry into the study 
and of the informed consent process should be recorded in the study subject’s source documents 
including the date. The original ICF signed and dated by the study subject and by the person 
consenting the study subject prior to the study subject’s entry into the study, must be maintained 
in the Investigator’s study files and a copy given to the study subject. In addition, if a protocol is 
amended and it impacts on the content of the informed consent, the ICF must be revised. Study 
subjects participating in the study when the amended protocol is implemented must be re-
consented with the revised version of the ICF. The revised ICF signed and dated by the study 
subject and by the person consenting the study subject must be maintained in the Investigator’s 
study files and a copy given to the study subject.
13.4.
Confidentiality
Celgene affirms the subject's right to protection against invasion of privacy and to be in 
compliance with ICH and other local regulations (whichever is most stringent). Celgene requires 
the Investigator to permit Celgene representatives and, when necessary, representatives from 
regulatory authorities, to review and/or copy any medical records relevant to the study in 
accordance with local laws.
Should direct access to medical records require a waiver or authorization separate from the 
subject’s signed ICF, it is the responsibility of the Investigator to obtain such permission in 
writing from the appropriate individual.
13.5.
Protocol Amendments
Any amendment to this protocol must be approved by the Celgene Clinical Research 
Physician/Medical Monitor. Amendments will be submitted to the IRB/EC for written approval.
Written approval must be obtained before implementation of the amended version occurs. The 
written signed approval from the IRB/EC should specifically reference the Investigator name, 
protocol number, study title and amendment number(s) that is applicable. Amendments that are 
administrative in nature do not require IRB/EC approval but will be submitted to the IRB/EC for 
information purposes.
13.6.
Institutional Review Board/Independent Ethics Committee Review 
and Approval
Before the start of the study, the study protocol, ICF, and any other appropriate documents will 
be submitted to the IRB/EC with a cover letter or a form listing the documents submitted, their 
dates of issue, and the site (or region or area of jurisdiction, as applicable) for which approval is 
sought. If applicable, the documents will also be submitted to the authorities in accordance with 
local legal requirements.
IP can only be supplied to an Investigator by Celgene or its authorized representative after
documentation on all ethical and legal requirements for starting the study has been received by 


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Celgene or its authorized representative. This documentation must also include a list of the 
members of the IRB/EC and their occupation and qualifications. If the IRB/EC will not disclose 
the names, occupations and qualifications of the committee members, it should be asked to issue 
a statement confirming that the composition of the committee is in accordance with GCP. For 
example, the IRB General Assurance Number may be accepted as a substitute for this list. 
Formal approval by the IRB/EC should mention the protocol title, number, amendment number 
(if applicable), study site (or region or area of jurisdiction, as applicable), and any other 
documents reviewed. It must mention the date on which the decision was made and must be 
officially signed by a committee member. Before the first subject is enrolled in the study, all 
ethical and legal requirements must be met.
The IRB/EC and, if applicable, the authorities, must be informed of all subsequent protocol 
amendments in accordance with local legal requirements. Amendments must be evaluated to 
determine whether formal approval must be sought and whether the ICF should also be revised.
The Investigator must keep a record of all communication with the IRB/EC and, if applicable, 
between a Coordinating Investigator and the IRB/EC. This statement also applies to any 
communication between the Investigator (or Coordinating Investigator, if applicable) and 
regulatory authorities.
Any advertisements used to recruit subjects for the study must be reviewed by Celgene and the 
IRB/EC prior to use.
13.7.
Ongoing Information for Institutional Review Board/ Ethics 
Committee
If required by legislation or the IRB/EC, the Investigator must submit to the IRB/EC:

Information on serious or unexpected adverse events as soon as possible; 

Periodic reports on the progress of the study;

Deviations from the protocol or anything that may involve added risk to subjects.
13.8.
Termination of the Study
Celgene reserves the right to terminate this study prematurely at any time for reasonable medical 
or administrative reasons. Any premature discontinuation will be appropriately documented 
according to local requirements (eg, IRB/EC, regulatory authorities, etc).
The Sponsor may consider closing this trial when data supporting key endpoints and objectives 
of the study have been analyzed. In the case where there are subjects still being administered the 
investigational product, and it is the opinion of the investigator(s) that these subjects continue to 
receive benefit from treatment, the subjects may transition to a rollover protocol (ACE-536-
LTFU-001) to allow these subjects continued access to luspatercept following their participation 
in this study (ACE-536-B-THAL-002) until the drug is commercially available and 
reimbursable.


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In addition, the Investigator or Celgene has the right to discontinue a single site at any time 
during the study for medical or administrative reasons such as:

Unsatisfactory enrollment;

GCP noncompliance;

Inaccurate or incomplete data collection;

Falsification of records;

Failure to adhere to the study protocol.


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14.
DATA HANDLING AND RECORDKEEPING 
14.1.
Data/Documents
The Investigator must ensure that the records and documents pertaining to the conduct of the 
study and the distribution of the investigational product are complete, accurate, filed and 
retained. Examples of source documents include: hospital records; clinic and office charts; 
laboratory notes; memoranda; subject’s diaries or evaluation checklists; dispensing records; 
recorded data from automated instruments; copies or transcriptions certified after verification as 
being accurate copies; microfiche; x-ray film and reports; and records kept at the pharmacy, and 
the laboratories, as well as copies of eCRFs or CD-ROM.*
14.2.
Data Management
Data will be collected via eCRF and entered into the clinical database per Celgene standard 
operating procedures (SOPs). This data will be electronically verified through use of 
programmed edit checks specified by the clinical team. Discrepancies in the data will be brought 
to the attention of the clinical team, and investigational site personnel, if necessary. Resolutions 
to these issues will be reflected in the database. An audit trail within the system will track all 
changes made to the data.
14.3.
Record Retention
Essential documents must be retained by the Investigator according to the period of time outlined 
in the clinical trial agreement. The Investigator must retain these documents for the time period 
described above or according to local laws or requirements, whichever is longer. Essential 
documents include, but are not limited to, the following:

Signed ICFs for all subjects;

Subject identification code list, screening log (if applicable), and enrollment log;

Record of all communications between the Investigator and the IRB/EC;

Composition of the IRB/EC;

Record of all communications between the Investigator, Celgene, and their authorized 
representative(s);

List of Sub-investigators and other appropriately qualified persons to whom the 
Investigator has delegated significant study-related duties, together with their roles in 
the study, curriculum vitae, and their signatures;

Copies of CRFs (if paper) and of documentation of corrections for all subjects;

IP accountability records;

Record of any body fluids or tissue samples retained;

All other source documents (subject records, hospital records, laboratory records, 
etc.); 


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
All other documents as listed in Section 8 of the ICH consolidated guideline on GCP 
(Essential Documents for the Conduct of a Clinical Trial).
The Investigator must notify Celgene if he/she wishes to assign the essential documents to 
someone else, remove them to another location or is unable to retain them for a specified period.
The Investigator must obtain approval in writing from Celgene prior to destruction of any 
records. If the Investigator is unable to meet this obligation, the Investigator must ask Celgene
for permission to make alternative arrangements. Details of these arrangements should be 
documented. 
All study documents should be made available if required by relevant health authorities. 
Investigator or institution should take measures to prevent accidental or premature destruction of 
these documents.


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15.
QUALITY CONTROL AND QUALITY ASSURANCE
All aspects of the study will be carefully monitored by Celgene or its authorized representative 
for compliance with applicable government regulations with respect to current GCP and SOPs.
15.1.
Study Monitoring and Source Data Verification
Celgene ensures that appropriate monitoring procedures are performed before, during and after 
the study. All aspects of the study are reviewed with the Investigator and the staff at a study 
initiation visit and/or at an Investigators’ Meeting. Prior to enrolling subjects into the study, a 
Celgene representative will review the protocol, eCRFs, procedures for obtaining informed 
consent, record keeping, and reporting of AEs/SAEs with the Investigator. Monitoring will 
include on-site visits with the Investigator and his/her staff as well as any appropriate 
communications by mail, email, fax, or telephone. During monitoring visits, the facilities, 
investigational product storage area, eCRFs, subject’s source documents, and all other study 
documentation will be inspected/reviewed by the Celgene representative in accordance with the 
Study Monitoring Plan.
Accuracy will be checked by performing source data verification that is a direct comparison of 
the entries made onto the eCRFs against the appropriate source documentation. Any resulting 
discrepancies will be reviewed with the Investigator and/or his/her staff. Any necessary 
corrections will be made directly to the eCRFs or via queries by the Investigator and/or his/her 
staff. Monitoring procedures require that informed consents, adherence to inclusion/exclusion 
criteria and documentation of SAEs and their proper recording be verified. Additional 
monitoring activities may be outlined in a study-specific monitoring plan.
15.2.
Audits and Inspections
In addition to the routine monitoring procedures, a Good Clinical Practice Quality Assurance 
unit exists within Celgene. Representatives of this unit will conduct audits of clinical research 
activities in accordance with Celgene appropriate SOPs to evaluate compliance with Good 
Clinical Practice guidelines and regulations.
The Investigator is required to permit direct access to the facilities where the study took place, 
source documents, eCRFs and applicable supporting records of study subject participation for 
audits and inspections by IRB/ECs, regulatory authorities (eg, Food and Drug Administration 
[FDA], European Medicines Agency [EMA], Health Canada) and company authorized 
representatives. The Investigator should make every effort to be available for the audits and/or 
inspections. If the Investigator is contacted by any regulatory authority regarding an inspection, 
he/she should contact Celgene immediately.
15.3.
Product Quality Complaint
A Product Quality Complaint (PQC) is any written, electronic, or oral communication that 
alleges deficiencies related to the identity, quality, durability, reliability, safety, effectiveness, 
purity, or performance of any drug product manufactured by or on behalf of Celgene Corporation 
after it is released for distribution. PQCs may reduce the usability of the product for its intended 
function or affect performance of the product and therefore pose a significant risk to the subject.
Examples of PQCs include (but are not limited to): mixed product, mislabeling, lack of effect, 


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seal/packaging breach, product missing/short/overage, contamination, suspected falsified, 
tampered, diverted or stolen material, and general product/packaging damage. If you become 
aware of a suspected PQC, you are obligated to report the issue immediately.
 


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16.
PUBLICATIONS
As described in Section 13.2, all protocol- and amendment-related information, with the 
exception of the information provided by Celgene on public registry websites, is considered 
Celgene confidential information and is not to be used in any publications. Celgene protocol-
related information proposed for use in a publication must be submitted to Celgene for review 
and approval, and should not be utilized in a publication without express written approval from 
Celgene, or as described in the Clinical Trial Agreement.
Celgene will ensure Celgene-sponsored studies are considered for publication in the scientific 
literature in a peer-reviewed journal, irrespective of the results. At a minimum, this applies to 
results from all Phase 3 clinical studies, and any other study results of significant medical 
importance. This also includes results relating to investigational medicines whose development 
programs have been discontinued.
Study results may also be presented at one or more medical congresses and may be used for 
scientific exchange and teaching purposes. Additionally, this study and its results may be 
submitted for inclusion in all appropriate health authority study registries, as well as publication 
on health authority study registry websites, as required by local health authority regulations.
Eligibility for external authorship, as well as selection of first authorship, will be based on 
several considerations, including, but not limited to, contribution to protocol development, study 
recruitment, data quality, participation in data analysis, participation in study steering committee 
(when applicable) and contribution to abstract, presentation and/or publication development.










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18.
APPENDICES
Appendix A: Table of Abbreviations
Table 6:
Abbreviations and Specialist Terms
Abbreviation or 
Specialist Term
Explanation
ADA
Anti-drug antibody
AE
Adverse event
ALT
Alanine aminotransferase (SGPT)
ANC
Absolute neutrophil count
ANCOVA
Analysis of covariance 
AST
Aspartate aminotransferase (SGOT)
AUC
Area under the curve
β-hCG
β-subunit of human chorionic gonadotropin
BMD
Bone mineral density
BP
Bodily Pain
BSC
Best supportive care
BUN
Blood urea nitrogen
CD-ROM
Compact disc, read-only-memory
Cmax
Maximum plasma concentration of drug
CMH
Cochran-Mantel-Haenszel
CSR
Clinical study report
CTCAE
Common Terminology Criteria for Adverse Events
DB
Database
DBP
Diastolic blood pressure
DBTP
Double-blind Treatment Period 
DMC
Data Monitoring Committee
DO2
Delivery of Oxygen 
DNA
Deoxyribonucleic Acid
DVT
Deep vein thrombosis
dw
Dry weight
DXA
Dual-energy x-ray absorptiometry
EC
Ethics Committee
ECD
Extracellular domain


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Table 6:
Abbreviations and Specialist Terms (Continued)
Abbreviation or 
Specialist Term
Explanation
ECG
Electrocardiogram
ECOG
Eastern Cooperative Oncology Group
eDiary
Electronic diary
EPO
Erythropoietin
eCRF
Electronic case report form
EEA
European Economic Area
eGFR
Estimated Glomerular Filtration Rate
EMA
European Medicines Agency 
EMH
Extramedullary hematopoietic
EOT
End of Trial
ESA
Erythropoiesis stimulating agent
EU
European Union 
FACIT-F
Functional Assessment of Chronic Illness Therapy-Fatigue
FACT-G
Functional Assessment of Cancer Therapy - General
FCBP
Female of childbearing potential
FDA
Food and Drug Administration
FS
Fatigue subscale
GCP
Good Clinical Practice
GH
General Health
GLP
Good Laboratory Practice 
Hb
Hemoglobin
HbA
Adult Hemoglobin 
HbE
Hemoglobin E
HbF
Fetal hemoglobin
HbH
Hemoglobin H
HBsAG
Hepatitis B surface antigen
Hct
Hematocrit
HCV
Hepatitis C virus
HIV
Human immunodeficiency virus
HR-QoL
Health-related quality of life


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Table 6:
Abbreviations and Specialist Terms (Continued)
Abbreviation or 
Specialist Term
Explanation
HRU
Health resource utilization
HSCT
Hematopoietic stem cell transplantation 
HU
Hydroxyurea
IB
Investigator’s Brochure
ICF
Informed consent form
ICH
International Council for Harmonisation
ICT
Iron chelation therapy
ID
Identification document
IND
Investigational New Drug
IP
Investigational Product
IRB
Institutional Review Board
IRT
Integrated Response Technology
ITT
intent-to-treat (subjects)
IUD
Intrauterine device 
IUS
Intrauterine hormone-releasing system 
LDH
Lactic dehydrogenase
LIC
Liver iron concentration
LMW
Low Molecular Weight
LLN
Low Limit of Normal
LVEF
Left ventricular ejection fraction
MCH
Mean corpuscular hemoglobin
MCID
Minimum clinical important difference 
MCS
Mental component summary
MCV
Mean corpuscular volume
MDRD
Modification of Diet in Renal Disease
MDS
Myelodysplastic Syndrome
MedDRA
Medical Dictionary for Regulatory Activities
MH
Mental Health
6MWT
6-minute walk test
MRI
Magnetic resonance imaging


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Table 6:
Abbreviations and Specialist Terms (Continued)
Abbreviation or 
Specialist Term
Explanation
mRNA
Messenger Ribonucleic Acid
NCI
National Cancer Institute 
NRS
Numeric Rating Scale
NTDT
Non-transfusion dependent β-thalassemia
NTDT-PRO
Non-transfusion dependent β-thalassemia-patient reported outcome
PCS
Physical component summary
PF
Physical Functioning
PGI-C
Patient Global Impression of Change
PGI- S
Patient Global Impression of Severity
PK
Pharmacokinetic(s)
PPS
Per protocol set
PQC
Product Quality Complaint
PRO
Patient reported outcome
PTFP
Post-treatment Follow-up Period
QoL
Quality of life
Q3W
Every 3 weeks
RBC
Red blood cell
RD
Responder Definition
RDW
Red blood cell distribution width
RE
Role Emotional
ROS
Reactive oxygen species 
RP
Role-Physical
SAE
Serious adverse event
SAP
Statistical analysis plan
SBP
Systolic blood pressure
SC
Subcutaneous 
SF
Social Functioning
SF-36
Medical Outcomes Study 36-Item Short Form 
SGOT
Serum glutamic oxaloacetic transaminase (AST)
SGPT
Serum glutamic pyruvic transaminase (ALT)


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Table 6:
Abbreviations and Specialist Terms (Continued)
Abbreviation or 
Specialist Term
Explanation
SoB
Shortness of breath (domain of NTDT-PRO)
SOP
Standard operating procedure
SUSAR
Suspected unexpected serious adverse reaction
SVT
Superficial Vein Thrombosis
TDT
Transfusion-dependent β-thalassemia
TGF-β
Transforming growth factor-β 
TI
Thalassemia Intermedia
TRV
Tricuspid valve regurgitation velocity 
T/W
Tiredness and weakness (domain of NTDT-PRO)
ULN
Upper limit of normal
TEAE
Treatment-emergent adverse events
TEE
Thromboembolic Event
VT
Vitality
WBC
White blood cell (count)


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Appendix B: ECOG Performance Status Scale
The Eastern Cooperative Oncology Group (ECOG) Performance Status scale 
 is 
used to assess a patient’s quality of life in an evaluation by a health professional of the daily 
activities and how the activities are affected by the disease of the patient.
Eastern Cooperative Oncology Group (ECOG) Performance Status Scale
Score
Description
0
Fully active, able to carry on all pre-disease performance without restriction
1
Restricted in physically strenuous activity but ambulatory and able to carry out work of 
a light or sedentary nature, eg, light housework, office work.
2
Ambulatory and capable of all self-care but unable to carry out any work activities. Up 
and about more than 50% of waking hours.
3
Capable of only limited self-care, confined to bed or chair more than 50% of waking 
hours.
4
Completely disabled. Cannot carry on any self-care. Totally confined to bed or chair
5
Dead


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ACE-536-B-THAL-002 Amendment 2 Final: 12 Jun 2020
Appendix C: National Cancer Institute (NCI) Common Terminology Criteria 
for Adverse Events (CTCAE) Version 4.0
Currently active minor version of NCI CTCAE, Version 4.0:


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Appendix D: New York Heart Association - Classification of Heart Failure
New York Heart Association - Classification of Heart Failure
Class
Symptoms
Class 1
No limitation of activities. No symptoms from ordinary activities
Class 2
Mild limitation of activity. Comfortable with rest or mild exertion
Class 3
Marked limitation of activity and be comfortable only at rest
Class 4
Complete rest, confined to bed or chair; any physical activity brings on discomfort and 
symptoms occur at rest


EDMS Doc. Number: 24782414 - 21759172
Celgene Signing Page
This is a representation of an electronic record that was signed electronically in Livelink.
This page is the manifestation of the electronic signature(s) used in compliance with
the organizations electronic signature policies and procedures.
 ================================================

SAP_001.pdf: 
Official Title of Study: 
A PHASE 2, DOUBLE-BLIND, RANDOMIZED, PLACEBO-CONTROLLED, MULTICENTER STUDY 
TO DETERMINE THE EFFICACY AND SAFETY OF LUSPATERCEPT (ACE-536) VERSUS 
PLACEBO IN ADULTS WITH NON-TRANSFUSION DEPENDENT BETA (β)-THALASSEMIA 
(The BEYOND™ Study) 
 
 
NCT Number: NCT03342404 
 
Document Date (Date in which document was last revised): Nov 5, 2020 
 


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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ACE-536-B-THAL-002Final Version1.0    5Nov2020
STATISTICAL ANALYSISPLAN
A PHASE 2, DOUBLE-BLIND, RANDOMIZED, PLACEBO-CONTROLLED, 
MULTICENTER STUDY TO DETERMINE THE EFFICACY AND SAFETY OF 
LUSPATERCEPT (ACE-536) VERSUS PLACEBO IN ADULTS WITH NON-
TRANSFUSION DEPENDENT BETA (β)-THALASSEMIA
(The BEYOND™Study)
STUDY DRUG:
Luspatercept (ACE-536)
PROTOCOL NUMBER:
ACE-536-B-THAL-002
DATE FINAL:
5NOV2020
Prepared by:
Celgene, awholly owned subsidiaryof
Bristol-MyersSquibbCompany
CONFIDENTIAL
The information contained in this document is regarded asconfidential 
and, except to the extent necessary to obtain informed consent, may not be 
disclosed to another party unless such disclosure is required by law or 
regulations.  Persons to whom the information isdisclosed must be 
informed that the information is confidential and may not be further 
disclosed by them.


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
Confidential and Proprietary
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ACE-536-B-THAL-002Final Version1.0    5Nov2020
TABLE OF CONTENTS
SIGNATURE PAGE...................................................................................................................6
1.
LIST OF ABBREVIATIONS...................................................................................8
3.
STUDY OBJECTIVES...........................................................................................13
3.1.
Primary Objective...................................................................................................13
3.2.
Secondary Objectives.............................................................................................13
4.
INVESTIGATIONAL PLAN.................................................................................15
4.1.
Overall Study Design and Plan...............................................................................15
4.1.1. 
Screening Period.....................................................................................................15
4.1.2.
Double-blind Treatment Period...............................................................................15
4.1.3.
Open-Label Phase...................................................................................................16
4.1.4.
Post-treatment Follow-up Period.............................................................................16
4.2.
Study Endpoints.....................................................................................................19
4.2.1.
Primary Efficacy Endpoint......................................................................................19
4.2.2.
Secondary Efficacy Endpoints................................................................................19
4.2.2.1.
Key SecondaryEfficacy Endpoints.........................................................................19
4.2.2.2.
Other Secondary Efficacy Endpoints.......................................................................19
4.2.4.
Safety Endpoints.....................................................................................................21
4.3.
Stratification, Randomization, and Blinding............................................................21
4.4.
Sample Size Determination.....................................................................................21
5.
GENERAL STATISTICAL CONSIDERATIONS.................................................23
5.1.
Reporting Conventions...........................................................................................23
5.2.
Analysis Populations..............................................................................................25
5.2.1.
Intent-to-Treat Population.......................................................................................25
5.2.2.
Per Protocol Population..........................................................................................25
5.2.3.
Safety Population....................................................................................................25
5.2.4.
Health-related QoL Evaluable Population...............................................................25
6.
SUBJECTDISPOSITION......................................................................................26


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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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7.
PROTOCOL DEVIATIONS AND IMPORTANT PROTOCOL 
DEVIATIONS........................................................................................................28
8.
DEMOGRAPHICS AND BASELINE CHARACTERISTICS................................29
8.1.
Demographics.........................................................................................................29
8.2.
Baseline Characteristics..........................................................................................29
8.3.
Beta-thalassemia Comorbidities/Medical History....................................................30
8.4.
Prior, Concomitant and Post Medications...............................................................31
8.4.1.
Prior Medications/Prior Beta-Thalassemia Treatment.............................................31
8.4.2
Concomitant Medications/ Concomitant Beta-Thalassemia Treatment....................31
8.4.3
Post Treatment Medications....................................................................................32
9
STUDY TREATMENTS ANDEXTENT OF EXPOSURE....................................34
9.1
Treatment Duration.................................................................................................34
9.2
Number of Doses Received per Subject..................................................................34
9.3
Average Number of Days Between Doses...............................................................34
9.4
Dose Modifications: Dose Delay, Dose Titration and Dose Reduction....................35
9.4.1
Dose Delay.............................................................................................................35
9.4.2
Dose Titration and Dose Reduction.........................................................................35
9.5
Investigational Drug Overdose................................................................................36
10
EFFICACY ANALYSIS........................................................................................37
10.1
Multiplicity.............................................................................................................38
10.2
Analysis of Primary Efficacy Endpoint...................................................................38
10.3
Analyses of Key Secondary Efficacy Endpoints......................................................39
10.3.1
NTDT-PRO (T/W Domain) Mean Change Between Weeks 13 to 24......................39
10.3.2
Hemoglobin Mean Change Between Weeks 13 to 24..............................................40
10.3.3
Hemoglobin Response Between Weeks 37 to 48.....................................................40
10.4
Analyses of Other Secondary Efficacy Endpoints...................................................41
10.4.1
FACIT-F Fatigue Subscale (FS): Mean Change from Baseline between 
Weeks 13 to 24 and Weeks 37 to 48.......................................................................41
10.4.2
NTDT-PRO SoB Score: Mean Change from Baseline between Weeks 13 to 
24 and Weeks 37 to 48............................................................................................41
10.4.3
Hemoglobin Mean Change Between Weeks 37 to 48..............................................42


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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10.4.4
NTDT-PRO (T/W Domain) Mean Change Between Weeks 37 to 48......................42
10.4.5
FACIT-F Fatigue Subscale (FS) Response at Weeks 13 to 24 and Weeks 37 
to 48.......................................................................................................................42
10.4.6
SF-36 v2: Mean Change from Baseline at Week 24 and Week 48...........................42
10.4.7
Mean Change in mean Daily Dose of Iron Chelation Therapy.................................43
10.4.8
LIC / ICT: Responder Analysis at Week 24 and Week 48.......................................44
10.4.9
Serum Ferritin: Mean Change from Baseline at Week 24 and Week 48...................44
10.4.10
Liver Iron Concentration: Mean Change from Baseline at Weeks 24 and 48...........45
10.4.11
Transfusion Free for 24 and 48 weeks.....................................................................46
10.4.12
Hemoglobin Increase from Baseline ≥ 1.0 g/dL Response Based on Rolling 
Method...................................................................................................................46
10.4.13
Duration of Mean Hemoglobin Increase from Baseline ≥ 1.0 g/dL..........................46
10.4.14
6MWT: Mean Change at Week 24 and 48..............................................................47
10.4.15
Proportion of Mean Hemoglobin Increase from Baseline ≥1.5 g/dL at Week 
13 to 24..................................................................................................................48
10.4.16
Proportion of subjects with a decrease from baseline ≥ (RD) in mean NTDT-
PRO T/W score, over Weeks 13 to 24 and Weeks 37 to 48.....................................48
10.4.17
Time from First Dosing Date to the First Mean Hemoglobin Response...................48
10.4.18
Longitudinal Analysis of Hemoglobin Mean Change from Baseline.......................49
10.5
Subgroup Analysis..................................................................................................49
10.6
Handling of Missing Data or Dropouts....................................................................50
10.6.1
Missing Data for non-QoL Assessment...................................................................50
10.6.2
Missing Data for QoL Assessment..........................................................................51
11
SAFETY ANALYSIS............................................................................................53
11.1
Adverse Events.......................................................................................................53
11.2
Adverse Events of Special Interest..........................................................................54
11.3
Other Adverse Events That Require Safety Analysis...............................................55
11.4
Clinical Laboratory Evaluations..............................................................................55
11.4.1
Hematology/Chemistry/Immunology......................................................................55
11.4.2
Serum Erythropoietin..............................................................................................57
11.4.3
Local lab “Reticulocyte (Blood)” parameter............................................................57
11.5
Vital Sign Measurements........................................................................................57
11.6
Electrocardiograms.................................................................................................58
11.7
Left Ventricular Ejection Fraction (LVEF).............................................................59


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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11.8
Antidrug Antibody Testing.....................................................................................59
11.9
Pregnancy Test and Menstrual Status for Female Subjects......................................60
14
HEALTH RELATED QUALITY OF LIFE ANALYSIS........................................66
15
GENERAL INFORMATION.................................................................................67
15.1
Interim Analysis.....................................................................................................67
15.2
DMC......................................................................................................................67
16
IMPACT OF COVID-19 ON EFFICACY AND SAFETY ANALYSIS.................68
16.1
Sensitivity Analysis of COVID-19 Impact on Efficacy Endpoints...........................68
16.2
Analysis and Reporting of COVID-19 Impact on Safety Endpoints........................69
18 
APPENDICES........................................................................................................73
18.1
Handling of Dates...................................................................................................73
18.1.1
Calculation Using Dates.........................................................................................73
18.2
Date Imputation Guideline......................................................................................74
18.2.1
Impute Missing Dates of Adverse Events/ Prior or Concomitant 
Medications, Procedures/Surgeries.........................................................................74
18.3
QoL Algorithm.......................................................................................................76
18.3.1
NTDT-PRO (Non-Transfusion-Dependent Thalassemia Patient-Reported 
Outcome)................................................................................................................76
18.3.2
FACIT-F................................................................................................................79
18.3.3
SF-36......................................................................................................................80


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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SIGNATURE PAGE
STATISTICAL ANALYSIS PLAN (SAP) AND SAP AMENDMENT APPROVAL SIGNATURE PAGE 
SAP TITLE
ACE-536-B-THAL-002 Statistical Analysis Plan
SAP VERSION, DATE
Final Version 1.0   5November2020
 
PROTOCOL TITLE
A Phase 2, Double-Blind, Randomized, Placebo-Controlled, Multicenter Study 
To Determine The Efficacy And Safety of Luspatercept (ACE-536) Versus 
Placebo In Adults With Non Transfusion Dependent Beta (β)-Thalassemia
INVESTIGATIONAL 
PRODUCT
Luspatercept (ACE-536)
PROTOCOL NUMBER
ACE-536-B-THAL-002
PROTOCOL VERSION, 
DATE
12-JUN-2020
SIGNATURE 
STATEMENT
By my signature, I indicate I have reviewed this SAP and find its contents to be 
acceptable.
Statistical Therapeutic Area Head
Signature
Printed Name
Lead Clinical Research Physician / Clinical Research Physician
Signature
Printed Name
 


EDMS Doc. Number: 25163165 - 25009896
Luspatercept (ACE-536)
Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
Confidential and Proprietary
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ACE-536-B-THAL-002Final Version1.0    5Nov2020
Lead Product Safety Physician
Signature
Printed Name


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
Confidential and Proprietary
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ACE-536-B-THAL-002Final Version1.0    5Nov2020
1.
LIST OF ABBREVIATIONS
6MWT
6-Minute Walk Test
ADA
Anti-drug antibody
ALT
Alanine aminotransferase (SGPT)
ANC
Absolute neutrophil count
ANCOVA
Analysis of covariance
AST
Aspartate aminotransferase(SGOT)
ATC
Anatomical therapeutic chemical 
AUC  
Area under the curve
BMD
Bone mineral density
BMI
Body massindex
BP
Bodily Pain
BSA
Body surface area
BUN
Blood urea nitrogen  
CI
Confidence interval
CMH
Cochran-Mantel-Haenszel
CTCAE
Common TerminologyCriteria for AdverseEvents
DBP
Diastolic blood pressure
DBPT
Double-Blind Treatment Period
DMC
Data Monitoring Committee
DXA
Dual energy x-ray absorptiometry
Dw
Dry weight
ECG
Electrocardiogram
ECHO
Echocardiography
ECOG
Eastern Cooperative Oncology Group
eCRF
Electronic casereport form
FACIT-F
Functional Assessment of Chronic Illness Therapy-Fatigue


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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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FS
FatigueSubscale
GDF
Growthdifferentiation factor
GH
General Health
Hb
Hemoglobin
HbF
Fetal hemoglobin
HRQoL
Health-related QoL
HRU
Healthcare Resource Utilization
ICF
Informed consent document
ICT
Iron chelation therapy
IP
Investigational product
IRT
Interactive Response Technology
ITT
Intent-to-treat
IVRS
Integrated voice response system
IWRS
Integrated Web Response System
LDH
Lacticdehydrogenase
LIC
Liver iron concentration
LLN
Lower limit of normal
LVEF
Left ventricular ejection fraction
MAA
Marketing authorization application
MCH
Mean corpuscular hemoglobin 
MCHC
Mean corpuscular hemoglobin concentration 
MCS
Mental component summary
MCV
Mean corpuscular volume  
MedDRA
Medical Dictionary for Regulatory Activities 
MH
Mental Health
MRI
Magnetic resonance imaging
MUGA 
Multi Gated Acquisition Scan
NA
Not applicable
NCI
Nationalcancer institute 


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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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NTDT
Non-transfusion dependentβ-thalassemia
NTDT-PRO
Non transfusion dependent β-thalassemia-patient reported outcome
OLP
OpenLabel Phase
OR
Odds Ratio
PCS
Physical component summary
PF
Physical functioning
PK
Pharmacokinetic
PGI-C
Patient Global Impression of Change
PPS
PerProtocol Set
PTFP
Post-Treatment Follow-up Period
QoL
Quality of life
RBC
Red blood cell
RD
Responder Definition
RDW
Red blood cell distribution width  
RE
Role-Emotional
RP
Role-Physical
SAP
Statistical analysis plan
SBP
Systolic blood pressure
SC
Subcutaneous
SD
Standard deviation
SE
Standard error 
SF
Social functioning
SF-36
Medical Outcomes Study 36-Item Short Form
SI
SystemeInternationale
SGOT
Serum glutamic oxaloacetic transaminase (AST)
SGPT
Serum glutamic pyruvic transaminase (ALT)
SoB
Shortness of breath(domain of NTDT-PRO)
SOC
System and organclass
PT
Preferred term


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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TEAE
Treatment emergente adverse event 
TRV
Tricuspid regurgitant velocity
T/W
Tiredness and weakness (domain of NTDT-PRO)
ULN
Upper limit of normal
VT
Vitality
WHO-DD
World Health Organization Drug Dictionary 


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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3.
STUDY OBJECTIVES
3.1.
Primary Objective
The primary objective is toevaluate the effect of luspatercept versus placebo on anemia,as 
measured by meanhemoglobin concentration in the absence of transfusions over continuous 12-
week intervals,from Week 13 to Week 24, compared to baseline.
3.2.
Secondary Objectives
The secondary objectives are:
Toevaluate the effect of luspatercept versus placebo on β-thalassemia-related symptoms, 
as measured by non-transfusion-dependent β-thalassemiapatient-reported outcome 
(NTDT-PRO) over continuous 12-week intervals(Weeks 13 to 24, Weeks 37 to 48) 
compared tobaseline
To evaluate the effect of luspaterceptversus placebo on functional and health-related 
quality of life (QoL) as measured by Medical Outcomes Study 36-Item Short Form 
(SF-36) and Functional Assessmentof Chronic Illness Therapy-Fatigue (FACIT-F) 
questionnaires
Toevaluate the long-term effect of luspatercept versus placebo on anemia, as measured 
by mean hemoglobin concentration in the absence of transfusionsover a continuous 
12-week interval from Week 37 to Week 48, compared to baseline
Toevaluate the effect ofluspatercept versus placebo oniron overload, as measured by 
liver iron concentration (LIC) and iron chelation therapy (ICT) daily dose
To evaluate the effect of luspatercept versus placebo on iron overload, as measuredby 
serum ferritin
To evaluate theduration of erythroid response
To evaluate the effect of luspatercept versus placebo on physical activity measured by 
6-minute walk (6MWT)
The safety and PK objectives are:
To evaluate safety and tolerability of luspatercept, includingimmunogenicity
To evaluate population pharmacokinetics (PK) of luspatercept in subjects with -
thalassemia


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
Confidential and Proprietary
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ACE-536-B-THAL-002Final Version1.0    5Nov2020
 
 
 


EDMS Doc. Number: 25163165 - 25009896
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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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4.
INVESTIGATIONAL PLAN
4.1.
Overall Study Design and Plan
This is a Phase 2, double-blind, randomized, placebo-controlled, multicenter study to determine 
the efficacy and safety of luspatercept (ACE-536) versus placebo in adults with non-transfusion
dependent beta (β)-thalassemia. The study is divided into the Screening Period, Double-blind 
Treatment Period (DBTP), Open-label Phase (OLP) and Post-treatment Follow-up Period 
(PTFP). The overall study design is described inFigure 1. It is planned to randomize 
approximately 150 subjects at a 2:1 ratio of luspatercept versus placebo.
4.1.1.
Screening Period
Upon giving written informed consent, the subject will enter the Screening Period to determine 
eligibility. The Screening Period isto last up to 4weeks with an administrative window of + 3 
days to allow all laboratory results to be available at site for evaluating the subject’s eligibility.
Re-screening is allowed and a new subject ID number will beassigned. Subjects will bestratified 
at the timeof randomization based onbaseline hemoglobin leveland baseline NTDT-PRO 
tiredness and weakness (T/W)score.
4.1.2.
Double-blind Treatment Period
Subjects will enter the Double-blind Treatment Period (DBTP) once they have completed the 
required assessments in the Screening Period and been randomized via the Interactive Response 
Technology (IRT)system. The DBTP will begin on Dose 1 Day 1 and end when all subjects 
have completed 48 weeks of treatment or have discontinued earlier. At that time, thestudy will 
be unblinded.
Subject randomization will occur via the IRT system and Dose 1 Day 1 should be scheduled 
within 3 days of randomization (can be on the same day as randomization). Eligible subjects will 
be randomized at a ratio of 2:1, luspatercept versus placebo,at a starting dose level of 1.0 mg/kg 
administered by subcutaneous (SC) injection once every 3 weeks. The maximum total dose per 
administration is 120 mg.
Best supportive care is allowed in both the luspatercept and placebo groups.This will include 
RBC transfusions, iron-chelating agents, use of antibiotic therapy, antiviral and antifungal 
therapy, nutritional support as needed, and other medications that are not prohibited, thus 
minimizing the safety risk to patients.
After the study is unblinded, and after DMC’s recommendation:
Subjects who received placeboand have been assessed as per protocol up to 48 weeks
after the first dose of investigational product (IP)(even if the IP is discontinued before 
completing 48 weeks of treatment), may access the OpenLabel Phase(OLP)to receive 
luspatercept for a maximum 15 monthsbefore moving to the rollover protocol for longer 
treatment.


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Subjects receiving luspaterceptmay continue their treatment in the OLPfor maximum 15 
monthsbefore moving to the rollover protocol for longer treatment(i.e. 5 years from 
Dose 1, or until treatment discontinuation, whichever occurs later).
Subjects who received luspaterceptand discontinued the IP in the DBTP maycontinue
and/or complete the long-termfollow-up of 5 years from first dose of IP, or 3 years from 
last dose (whichever occurs later), to completethe Post-Treatment Follow-Up Period 
(PTFP)under the rollover protocol in this study untilthe End of Trial. 
Subjects may be discontinued from treatment and/or the study decided by the treating physician.
4.1.3.
Open-Label Phase
Open-label Phase (OLP) will begin after the study unblinding, and after DMC’sdetermination of 
risk/benefit analysis andrecommendation. The start of this OLP will be determined by the 
availability of primary analysis data that justify the use of luspatercept in an OLP, which will be 
reviewed by the independent external DMC.  After DMC review of safety and efficacy, DMC 
will determine if the use of luspatercept in subjects previously randomized to receive placebo in 
this OLP is safe and recommended, and if subjects already on luspatercept can continue to be 
treated at their current dose level (best supportive care is allowed). In the OLP, subjects may 
receive luspatercept for maximum 15 monthsor discontinue early.
Access to the OLP:
Subjects initially assigned to placebo in the DBTPcan enter the OLP only if the DMC 
allows it, as outlined above, and if:
o they are still receiving placebo at the time of unblinding, or 
o they discontinued the IP before the unblinding, but they continued their participation 
in the PTFP until the unblinding and complied with the PTFP assessments, and they 
still fulfill the following selected eligibility criteria prior to Dose 1 Day 1, as per PI 
assessment using centrallab data.
Inclusion criteria: numbers 8-10 (Refer to Section4.2of Protocol)
Exclusion criteria: numbers 1-8, 10, 12-15, 17, 18 and 20 (Refer to Section4.3
of Protocol)
Subjects initially assigned to luspatercept in the DBTPcan enter the OLP if they are still 
receiving luspatercept at the time of unblinding, and maycontinue their treatment in the 
rollover protocol, after completion of the OLP. 
Subjects who discontinue from the study before the unblinding andwithout completing the PTFP 
period are not allowed to re-enter this study and access luspatercept in the OLP.
4.1.4.
Post-treatment Follow-up Period
Subjects who discontinue treatment with the IP in the DBTPor OLP, regardless of reason, will 
enter the PTFP andmaycontinue or completethelong-term follow-up of5 years from first dose 


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Protocol ACE-536-B-THAL-002                                                                     Celgene Corporation
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of IP, or 3 years from last dose (whichever occurs later), under the rollover protocoluntil the End 
of Trial. Specificassessmentsand visits to be performed during this period are definedinTable 3
of Protocol,Table of Events. After the unblinding, and after DMC’s recommendation:
Subjects who received placeboand have been assessed as per protocol at least up to 48 
weeks after the first dose of IP(even if the IP is discontinued before completing 48 weeks 
of treatment), may stop the PTFP and access the OLPto receive luspatercept, if eligible.
Subjects who received luspatercept and discontinued the IP in the DBTP or OLP may 
complete the PTFP and continue or complete the long-term follow-up of 5 years from 
first dose of IP, or (3 years after from  last IP dose (whichever occurs later) to complete 
the PTFP under) in the rollover protocol until the End of Trial.  Note: only the visit at9 
weeks after last dose should be performed in this study before moving to the rollover 
study.  
The Endof Trialis defined as the date all subjects complete theOLP(if allowed to access the 
OLP), ordiscontinue earlier, or, the date of receipt of the last data point from the last subject 
that is required for primary, secondary,and/or exploratory analysis, as prespecified in the 
protocol,whichever is the laterdate.
The Sponsor may end the trial when all key endpointsand objectives of the study have been 
analyzed,and the availability of a rollover protocol exists into which any subjects remaining on 
study may be consented and continue to receive access to luspatercept, if not yet commercially 
available, and/or complete the PTFP.


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Figure 1: Overall Study Design
EOS: end of study; EOT: end of trial;ICF:informed consent form; IP: investigational product; Q3W: every 3 
weeks; SC: Subcutaneous.
aDosemay be titrated up to a maximum of 1.25 mg/kg.
bDouble-blind Treatment Period (DBTP)will end after last subject enrolled has completed 48 weeks of treatment or 
discontinued earlier, or when the study is unblinded.
cThe study will be unblinded 48 weeks after last subject has received the first doseof IP. At thattime, subjects still 
benefitting from luspatercept treatment as well assubjects who received placebo and have been assessed as per 
protocol up to 48 weeks after the first dose of IP (even if they have discontinued the IP before completing48 
weeks of treatment), may access the OLP to receive luspatercept for maximum 15 months on the basis of DMC 
recommendationafter unblinded data review, and can continue treatment in the rollover protocol after EOT up to 5 
years of Dose1, or treatment discontinuation, whichever occurs later.
dSubjects in the DBTP who have discontinued luspatercept before the unblinding or the OLP will continue the 
PTFP until the End of Trial (EOT) and may continue the PTFP in the rollover study up 5 years from first dose of 
IP, or 3 years from last dose (whichever occurs later), to complete the Post-treatmentFollow-up Period under the 
rollover protocol.  Subjectsin the DBTP who have discontinued the placebo before the unblinding will continue 
the PTFP until the unblinding and may access the OLP, after DMC’s recommendation.


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4.2.
Study Endpoints
4.2.1.
Primary EfficacyEndpoint
The primary efficacy endpoint is:
Proportion of subjects who have an increase from baseline ≥1.0 g/dL in mean of 
hemoglobin values over a continuous 12-week interval from Week 13 to Week 24 in the 
absence of transfusions.
4.2.2.
Secondary Efficacy Endpoints
4.2.2.1.
Key SecondaryEfficacy Endpoints
The analyses of secondary efficacy endpoints will be performed on the ITT population. The key 
secondary endpoints will be measured from Dose 1 Day 1 of the DBTP,and will be statistically
tested in a sequential orderattwo-sidedα = 0.05 level(details related tomultiplicity adjustment 
can befound in Section10.1).  The keysecondary efficacy endpoints include:
Mean change from baseline in NTDT-PRO Tiredness and Weakness(T/W)domain 
score over acontinuous 12-week interval from Week 13 to Week 24. 
Mean hemoglobin change from baseline overa continuous12-week interval from Week 
13 to 24 in the absence of transfusion.
Proportion of subjects who have an increase from baseline ≥1.0 g/dL in meanof 
hemoglobin values over a continuous 12-weekinterval from Week 37 to Week 48 in the 
absence of transfusions.
4.2.2.2.
Other SecondaryEfficacy Endpoints
Other secondary efficacy endpoints include:
Meanchange from baseline inmean Functional Assessment of Chronic Illness Therapy-
Fatigue(FACIT-F)Fatigue Subscale (FS) score over a continuous 12-week interval from 
Week 13 to Week 24.
Mean change from baseline in mean NTDT-PRO Shortness of Breath (SoB)domain score 
over a continuous 12-week interval from Week 13 to Week 24
Mean change from baseline in mean hemoglobin values in the absence of transfusions over 
a continuous 12-week interval from Week 37 to Week 48.
Mean change from baseline in mean FACIT-FFatigueSubscale(FS) score, mean NTDT-
PRO T/W domain score and mean NTDT-PRO SoBdomain score over a continuous 12-
week interval from Week 37 to Week 48.


EDMS Doc. Number: 25163165 - 25009896
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Proportion of subjects with an increase from baseline ≥ 3 in mean FACITFatigueSubscale
(FS) score overa continuous 12-week interval from Week 13 to Week24.
Proportion of subjects with an increase frombaseline ≥ 3 in mean FACITFatigueSubscale
(FS) score over a continuous 12-week interval from Week 37 to Week 48.
Mean change from baseline in the physical component summary(PCS) and mental 
component summary (MCS) scores ofMedical Outcomes Study 36-Item Short Form (SF-
36-v2)at Week 24 and Week 48.
Proportion of subjectswith improvement of iron overload at Week 24 andWeek 48, as 
measured by:
o For subjects with baseline liver iron concentration (LIC) (by magnetic resonance 
imaging [MRI]) ≥3 mg/g dry weight (dw): ≥20% reduction in LIC, OR ≥ 33% 
decrease in iron chelation therapy (ICT) daily dose
o For subjects with baseline LIC (by MRI) < 3 mg/g dw: no increase in LIC > 1 mg/g 
dw AND not starting treatment with ICT or no increase inICT daily dose ≥33%, if 
on ICT at baseline.
Mean change from baseline in serum ferritin atWeek 24,Week 48, and up to last 
assessment.
Mean change from baseline in LIC at Week 24,Week 48, and up to last assessment.
Proportion of subjects who are transfusion-free over 24 weeks.
Proportion of subjects who are transfusion-free over 48 weeks.
Duration of the mean hemoglobin increase from baseline ≥1.0 g/dL.
Mean change from baseline in the 6MWT distance at Week 24 and Week 48.
Proportion of subjects who havean increase from baseline ≥1.5 g/dL in mean of 
hemoglobin values over a continuous 12-weekinterval from Week 13 to Week 24 in the 
absence of transfusions.
Proportion of subjects with a decrease from baseline ≥ Responder Definition (RD)in mean 
NTDT-PRO T/W score, over Weeks 13to 24 and Weeks 37 to 48 
 
 


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4.2.4.
Safety Endpoints
Safetyendpoints include:
Type, frequency, and severity of adverse events andtheirrelationship to investigational
product (IP)(per NCI CTCAE version 4.0)
Frequency of antidrug antibodiesand its effect on efficacy and safety
4.3.
Stratification, Randomization, and Blinding
Subjects will be randomized to receive luspatercept or placebo at a 2:1 ratio. Randomization will 
be accomplished by an IRTto ensure timely registration and randomization. A stratified block 
randomization schedule will be implemented. Randomization will be stratified by:
Baseline hemoglobinlevel
a. ≥ 8.5 g/dL
b. < 8.5 g/dL
Baseline NTDT-PRO T/W score
a. ≥ 3 points
b. < 3 points
4.4.
Sample Size Determination
Based on the assumption oftargeted primary endpoint response rates of at least 50% in the 
luspatercept group and 10% for the placebo group, and 2:1 randomization, a total sample size of 


EDMS Doc. Number: 25163165 - 25009896
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150 (100 in the luspatercept group, 50 in the placebo group) will have at least 99% power to detect 
the difference between the 2 groups with a 2-sided alpha of 0.05 and assumed 10% dropout rate.
For NTDT-PRO T/W domain scores,assume the mean change from baselinescores at Week 24 
are 1.2 and 0.5 for luspatercept and placebo group, respectively, with a common standard deviation 
of 1.2, the statistical power will be 91%.


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5.
GENERAL STATISTICAL CONSIDERATIONS
5.1.
Reporting Conventions
Summary tables, listings, figures and any supportive SAS outputs will include a “footer” of 
explanatory notes that will indicate, at a minimum, the following: 
• Program source (e.g., SAS program name,including the path, that generates the output) and
• Data extraction date (e.g., the database lock date, run date)
The purpose of the data extraction date is to link the output to a final database, either active or 
archived, that is write-protected for replication and future reference.  An output date will also
appear on each output page and willindicate the date the output was generated by the analysis 
program. 
The following reporting conventions apply generally to tables, listings, and figures:
Data from all study centers will be combined for analysis;
Therandomizationstratification variables used in the analyses will be derived based on 
the electroniccase report form (eCRF) data.
All statistical tests of the treatment effect will preserve a significance level of 0.050 for 
2-sided tests. Testing of interactions will be performed at the 0.100 significance level,
unless specified otherwise;
P-values will be rounded to 4 decimal places. P-values that round to 0.0000 will be 
presented as ‘<0.0001’ and p-values that round to 1.000 will be presented as ‘>0.9999’; 
Confidenceintervals (CIs) will be presented as 2-sided 95% CIs unless specified 
differently in specific analysis;
Summary statistics will consist of the number and percentage of subjects ineach 
treatment groupfor discrete variables, and the sample size, mean, median, Standard 
Deviation(SD),Q1, Q3,minimum, and maximum for continuous variables;
All mean, median, Q1, and Q3values will be formatted to one more decimal place than 
themeasured value. Standard deviation values will be formatted to two more decimal 
places than the measured value;Minimum and maximum values will be presented to 
the same number of decimal places as the measured value.
All percentages will be rounded to onedecimal place. The number and percentage of 
responses will be presented in the form XX (XX.X%), where thepercentage is in the
parentheses; when the number of a response is zero, percentage will not be presented 
for that response;
All listings will be sorted forpresentation in order of treatment group, study center, 
subject, and date of procedure or event ifnot otherwise specified;


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All listings willdisplay original collected values, cases with special marks (i.e., <500) 
will be listed as it is. The special mark willbe removed if the value is used for 
calculation in tables;
All analysis and summary tables will have the analysis population sample size (ie, 
number of subjects)if not otherwise specified;
All summary tables will be displayed by treatment (“Luspatercept” and “Placebo”), the 
“Total” group will be added for sections if specified;
In general, if not otherwise specified, baseline value will be defined as the last value 
(including “unscheduled”) on or before the first dose of IP(if collecting time is 
available, date/time will be used to compare with first dosing date/time to identify 
baseline record, if there is no timeavailable, only date will be used); if multiple values 
are present for the same date/time, the average of these values will be used as the 
baseline. For subjects who were nottreated, the value on or prior to randomization date 
will be used. Specifically,for the laboratory hematology parameter ‘Leukocytes’, the 
baseline is defined as the highest value between screening visit and dose 1 day 1 visit.
For data handling in changefrom baseline and shift tables (except for MRI and DXA 
parameters), “unscheduled” visits willbe grouped with the closest scheduled visit based 
on assessment date.The average will be used as value for that scheduledvisitin change 
from baseline tables; the worst category willbe used in shift tables. If an unscheduled 
visit has equal distance to two scheduled visits, it will be grouped with the later visit.
Specifically, for anti-drug antibody (ADA)titer summary, the titer value will notbe 
averaged if an “unscheduled” visit is mapped to the closest scheduled visit. The titer for 
“unscheduled’ visit will only be used for summary if the original scheduled visit has no 
titer result.
For hemoglobin(Hb)concentration relatedefficacy endpoints summary, specific
intervalsaredefinedas:
- Baseline 4-week interval: from Week -4(Day -27with an allowable administrative 
3-day window)to Dose 1 Day 1(Day 1).The details of the baseline definition will 
be specified in theprogramming specification.
-
Weeks13-24 intervalis chosen in the following order:
a. Average of all Hbmeasurements in Weeks13-24 (Day 86to Day169) if Weeks
13-24 has >=3 Hbmeasurements
b. Average of all Hbmeasurements in Weeks12-23 (Day 79 to Day 162) if Weeks
12-23 has >=3 Hbmeasurements
c. Average ofall Hbmeasurements in Weeks14-25 (Day 93 to Day176) if Weeks
14-25 has >=3 Hbmeasurements
d. When the number of Hbmeasurements is less than 3 among Weeks13-24, 
Weeks12-23, andWeeks14-25,then choose the largest number of Hb
measurements in the following order as Hbat Week13-24:
1) Hbin Week13-24
2) Hbin Week12-23 


EDMS Doc. Number: 25163165 - 25009896
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3) Hbin Week14-25
e. Otherwise, missing
- Weeks37-48 interval: Samerule as Week 13-24 interval
The calculation of weekly NTDT-PRO scoresisdetailed in Section18.3.1. The 12-
week interval score is obtained by averaging all the weekly scores(at least one non-
missing)in these 12 weeks. If all the weekly scores in these 12 weeks are missing, the 
12-week intervalscore is then declared missing.  
This SAP addresses efficacy and safety endpoints duringthe double-blinded treatment 
period (including the initial 48-week treatment period for all subjects and the long-term 
treatment period for earlyenrolled subjects). The database will be locked upon all subjects 
completed48 weeks of the double-blind treatment periodor discontinued beforereaching 
48 weeks. Allthe data collected up to data cutoffdatewill be used for summary.Data 
selection rules will be applied in each summary panel as needed, please refer to individual 
part for details.
5.2.
Analysis Populations
A summary of analysis populationswill be presentedby treatment groupand total.
5.2.1.
Intent-to-Treat Population
The intent-to-treat (ITT) population will consistof all randomized subjects regardless of whether
ornot thesubject received IP. All efficacy analyses will be conducted for the ITT population and
will be analyzed based on randomization treatment.
5.2.2.
Per Protocol Population
Subjectsin the ITT who have taken at least1dose of IP and do not haveimportantprotocol
deviations as described in Section 7prior to database lock.  The Per Protocolpopulation might be 
used in addition to ITT population to analyze primary and key secondary endpoints.
5.2.3.
Safety Population
The safety population will consist ofall subjects who were randomized and received at least one 
dose of IP. Subjects will be included in the treatment group corresponding to the IP they actually 
received.
5.2.4.
Health-related QoL EvaluablePopulation
The Health-related QoL (HRQoL) evaluablepopulationconsists of all subjects in the ITT 
population with a validhealth-related QoL assessment at baseline (screening) and at least one valid 
postbaseline assessment. 


EDMS Doc. Number: 25163165 - 25009896
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6.
SUBJECT DISPOSITION
The totalnumber of subjects screened and totalnumber of subjects with screen failure will be 
summarizedand listed.Reasons subjects did notqualify for the study will be displayed by 
category.A correspondinglisting will be provided. 
A summary of subject dispositionwill be presented by treatment groupand totalfor ITT, Per 
Protocol,HRQoLandsafety populations.
Subjectdisposition summarywill present the number and percentage of subjects for thefollowing 
categories: 
subjectswho were randomized, 
subjects who received treatment,
subjectswho discontinued study treatment, 
subjects whose treatment were ongoing,
subjects whocompleted 24 weeks of treatment, 
subjects who completed 48 weeksof treatment, 
subjectswho discontinued from thestudy by treatment group andtotal. 
the reasons for discontinuation ofstudy treatment 
the reasons fordiscontinuation of study participation
All percentages will be based on the number of subjects randomizedusing the ITT, Per Protocol,
HRQoL, or safetypopulations.
The reasons for treatment discontinuation willbe collected on the electronic case report form
(eCRF) and summarized for all treated subjects basedon the following categories:
Death
Adverse event
Pregnancy
Progressive disease
Lack of efficacy
Recovery
Withdrawal by subject
Non-compliance withstudydrug
Lost to follow-up
Study terminated bysponsor


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Transitiontocommercially availabletreatment
Physician decision
Site terminated by sponsor
Protocol deviation
Transition torolloverProtocol
Failure to meettreatment criteria
Other:dose is delayed for more than 15 weeks due to AEs (including case of elective 
surgery/hospitalization
Other
The reasonsfor study discontinuationwill be collected on the eCRF (only when FUP period is
not completed) and will be summarized for all randomized subjectsbased on the following
categories:
Death
Adverse event
Pregnancy
Lackofefficacy
Withdrawal bysubjectorparent/guardian
Non-compliance withstudy drug
Lost to follow-up
Study terminated bysponsor
Transition tocommercially availabletreatment
Physician decision
Disease relapse
Protocol deviation
Transition to rollover protocol
Other
A summary ofsubjects enrolled by geographicregion, country,and site will be provided in a 
separate table by treatment group and total.
A subject disposition listing will be provided.


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7.
PROTOCOL DEVIATIONSAND IMPORTANT PROTOCOL
DEVIATIONS
The protocol deviations and important protocol deviations will be identified and assessed by 
clinical research physicianor designee following company standard operational procedure. An 
importantprotocol deviationoccurs when there is any departure fromthe approved protocol that:
impacts the safety, rights, and/or welfare of the subject; or negatively impacts the quality or 
completeness ofthe data; or makes the informed consent document/form inaccurate.  Important 
protocol deviationsare identified based on blinded data reviews of deviation log throughout the 
study and are finalized prior to database lock.
The number andpercentage of thesubjects with any protocol deviation, or important protocol 
deviationwill be providedfor the ITT populationrespectively by treatment group and total. For 
important protocol deviations, thenumber and percentage of subjects within eachsubcategory will
be summarized as well.
Allprotocol deviations will be listed for the ITT population.


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8.
DEMOGRAPHICS AND BASELINE CHARACTERISTICS
The demographicsandbaseline characteristicswill be summarized for the ITT population.
Individual subject listings will be providedto support the summarytables.
8.1.
Demographics
Summary statistics will be provided descriptively by treatment groupand totalfor the following 
continuous variables:
Age
Weight (kg)
Height(cm)
Body mass index (BMI; kg/m2)
Age or dateof birth will berecordedoneCRF. Where age is not recorded, age will be calculated as 
described in Section18.1.1.
Bodymass index willbe calculated as follows: BMI (kg/m2) = baseline weight in kg / (height in 
m)2.
A frequency summary (number and percentage) will be provided by treatment group for the 
followingcategorical variables:
Age category (≤32years, > 32 -≤50 years and > 50 years)
Sex(Male, Femalewithor without childbearing potential, Unknown, Undifferentiated)
Race (American Indian or Alaska Native, Asian, Black or African American, Native 
Hawaiian or Other Pacific Islanders, White, Not Collected or Reported, Other)
Ethnicity (Hispanic or Latino, NotHispanic or Latino, Not Reported, Unknown)
Region (North America and Europe, Middle East,Asia-Pacific)
BMI category (<20, ≥20to <25, ≥25to <30, 30kg/m
2)
8.2.
Baseline Characteristics
The following baseline characteristics will be summarized.
Beta-thalassemia diagnosis:Beta-Thalassemia, Hemoglobin E/Beta-Thalassemia, Beta-
Thalassemia combined with Alpha-Thalassemia;
Baseline hemoglobin level (mean of at least 2 Hb values by central lab at least 1 week 
apart during the 28 days screening period)summarized as continuous variable as well 
as by category (≥ 8.5 g/dL and< 8.5 g/dL)excludingthe Hb values within 21 days 
following a transfusion;


EDMS Doc. Number: 25163165 - 25009896
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Baseline NTDT-PRO T/W Score (calculated over 7 days prior to Dose 1 Day 1detailed
in Section18.3.1)summarizedas continuousvariable as well as by category (≥ 3 points 
and< 3 points);
Baseline NTDT-PRO SoBScore (calculated over 7 days prior to Dose 1 Day 1detailed
in Section18.3.1);
Baseline transfusion burden in units/24weeksbefore Dose 1Day 1(descriptive and
categorized level: =< median valueand > median valueif baseline transfusion burden > 
0);
Baseline transfusion burden in units/12weeksbefore Dose 1 Day 1(descriptive and 
categorized level:=< median valueand > median value if baseline transfusion burden > 
0);
Beta-thalassemiagene mutation grouping:Beta Allele 1 Mutation, Beta Allele 2 
Mutation, Alpha Gene 1 Mutation, Alpha Gene 2 Mutation, Other Disease-related 
Mutations
Eastern Cooperative Oncology Group(ECOG) performance status (0 or 1) at screening 
visittoassess how the disease affects subjects’ daily activities:0 = fully active, able to 
carry on all pre-disease performance without restriction;1 = restricted in physically
strenuous activity but ambulatory and ableto carry out work ofa light or sedentary 
nature, e.g., light housework, office work;A listing will be providedfor ECOG data.
Splenectomy: Yes/No;
Baseline Serum Ferritin;
Hepatitis B and C results;
MRI liver iron content (LIC) (descriptive and categorized level: <3,>=3-≤5, > 5-≤7, 
>7-≤15and > 15). The value of LIC will be either thevaluecollected fromeCRFor 
the value derived from T2*, R2* or R2 parameter dependingonwhich techniques and 
software was used for MRI LIC acquisition. Please refertoSection 10.4.10for more 
imputation details
Bone mineral density DXA scan (BMDsand T-scoresby location);
Baseline 6-MinuteWalk Test (6MWT);
Baseline FACIT-F Fatigue Subscale (FS);
Baseline SF-36PCS and MCS Scores.
8.3.
Beta-thalassemia Comorbidities/Medical History
The Beta-thalassemia comorbidities and medical history will be coded by Medical Dictionary for
Regulatory Activities (MedDRA; Version 23.0), and summarized by system organ class (SOC)
and preferredterm (PT) by treatment group and total. Separate tables will be provided forcurrent 


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Beta-thalassemia comorbidities andthe history of Beta-thalassemia comorbidities. The SOCs and 
PTs will be listed indescending frequency within the luspatercept group. Asubject will becounted 
onlyonceformultiple events within each SOC/PT.
A separate table will be provided to summarize Beta-thalassemia comorbidities by comorbidity 
termsfor each treatment group and total.
Corresponding listing will be provided.  For cancerhistory, data will be presented in the listing.
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 


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9 
STUDYTREATMENTS AND EXTENT OF EXPOSURE
Subjects will be assigned to one of following regimens during treatmentphase:
Luspatercept starting dose level 1.0mg/kg SC once every 21 days
Placebo SC once every 21 days
Study treatment and extent of exposure summaries will be provided based on the safety population. 
Descriptive statistics will be provided for treatment duration,number of doses received per 
subject/treatment andaverage number of days per dose by treatment group and total. The number 
and percentageofsubjects will be summarized for maximum dose level received, and dose level 
reduced toby treatment group and total.Correspondinglisting will be provided.
9.1
Treatment Duration
Treatment duration (weeks) is defined as: 
[(The treatment end date) –(Thetreatment start date) + 1]/7,
where the treatment start date is the date of the first dose of study drug. The treatmentend date is 
min[(date of last dose + 20), death date].For subjects who are still on treatment at the time of 
study closure or clinical cutoff, the minimum of (datacutoff date, date of last dose+ 20) will be 
used as the treatment end date.
Descriptive statistics will be summarized for treatment duration by treatment groupand total.
9.2
Number of Doses Received per Subject
Total numberof doses received per subject is defined as the total number of dosesthe subject 
received (i.e., total number of non-zero doses). Itwill be summarized descriptively and 
categorically(1, 2, 3, 4, 5, 6, 7, 8, 9–16,17 –24, 25 –32, >32) by treatmentgroupand total. The 
total number of doses receivedwill be calculated fromall subjects within each treatment group. 
The total numberand percentage of doses receivedfor each planned dose level (1.25mg/kg, 1.0
mg/kg,0.80 mg/kg,0.60mg/kg, 0.45mg/kg) will becalculatedwithin treatment group, with the 
total number of doses receivedas denominator.
9.3
Average Number of Days BetweenDoses
Average number of days between dosesis defined as number of days on treatment(treatment 
duration)divided by the numberof doses(where a subject received a non-zero dose)for each 
subject.Descriptive summary statistics will be provided for average number of days per dose by 
treatment group and total.


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9.4
Dose Modifications: Dose Delay, Dose TitrationandDose Reduction
9.4.1 DoseDelay
Does delay is defined as delay of planned dose schedule due to increased hemoglobin (≥ 11.5 
g/dL) or adverse events which also further categorized by related eventsequal to grade 2 and ≥ 
grade 3 or WBC count ≥ 3X baseline or any other reasons. If dose delay exceeds 15 weeks from 
last dosing date, the treatment should be discontinued.
9.4.2 Dose Titrationand Dose Reduction
Dose adjustment includes dose reduction and dose titration (increase). Titration is based on 
hemoglobin level over the previous two doses compared to baseline.  Subjects may be dose-
escalated up to 1.25 mg/kg during the DBTP and OLP, but the maximum total dose per 
administrationshould not exceed 120mg.The dose escalationcriteria are defined as follows:
Dose escalation maybe performed if at a constant dose level, the increase of mean 
hemoglobin (uninfluenced by transfusions,ie, > 21 days post-transfusion) over 2 cycles 
(6 weeks) is < 1.0 g/dL, compared tothe baseline hemoglobin value (mean of 2 values 
1 week apart within4 weeks of randomization);
Dose escalation may be performed if at a constant dose level, the increase of mean 
hemoglobin (uninfluenced by transfusions,ie, > 21 days post-transfusion) over2 cycles 
(6 weeks)is≥ 1.0, but < 2.0 g/dLcompared to the baseline hemoglobin value (mean of 
2 values 1 week apart within 4 weeks of randomization).
Dose reduction can be caused by increased or high level of hemoglobin or adverse events.Subjects 
who havebeen dose-reduceddue to any related AE ≥ Grade 3, as indicated in Table 5of Protocol, 
should not be dose-escalated during the DBTP. Although, following Investigator’s requests, the 
Sponsor may allow dose increase to the next higherdose level, after safety and efficacy data
review.Starting dose with dose reductions and escalations are presented in            
Table1.
           
Table 1:Starting Dose Level with Dose Adjustments
3rd Dose 
Reduction
(~25 %)
2nd Dose 
Reduction
(~ 25 %)
1st Dose 
Reduction
(~ 25 %)
Starting Dose 
Level
1st Dose
Increase
0.45 mg/kg
0.6 mg/kg
0.8 mg/kg
1.0 mg/kg
1.25 mg/kg
The dose delay, dosereduction,and dose titration will be summarizedin separate tablesby 
treatment groupand total. The numberof subjects with at least one dose delay/reduction/titration, 
number of dose delays/reduction/titrationper subject,reason for dose delayand adjustment,time 
to first dose delay/reduction/titration(days),and time to first dose delay/reduction due to AE 
(days)will be summarized by treatment group and total.Correspondinglisting will be provided.  


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9.5
Investigational Drug Overdose
Overdose (refers toluspatercept only), is defined as SC 10% over the protocol-specified dose level 
assigned to agiven subject, regardless of adverse events or sequelae. A listing will be provided for 
any overdose, which occursaccidentally or intentionally as collectedin theeCRF.


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10
EFFICACY ANALYSIS
All efficacy evaluations will be conducted using the ITT populationwith the exception ofFACIT-
F Fatigue Subscale(SF)and SF-36 analysesthat will be conducted on the HRQoL evaluable 
population.NTDT-PRO T/W and SoB scores willbe analyzed by both ITT and HRQoL 
populations.The primary and key secondary endpoints will also be analyzed based on the Per 
Protocol populationas a sensitivity analysis.
Some continuous variableslike hemoglobinand weekly NTDT-PROT/Wand SoB domainswill 
be derived as the sumof resultsover 12 weeks divided by the number of assessments.The mean 
over12 weeks will be used to derive mean change from baseline for each subject.
For the early treatment-discontinued subjects, i.e.subjects who did not complete 24 weeksor 
48weeksof double-blinded treatment period, the transfusion and assessmentrecords(including 
Hb and QoL)will still be collected up to 48weekspost Dose 1 Day 1or 9 weeks post last dose, 
whichever is the later date.All the assessmentsbefore the efficacy cutoff date will be used to 
evaluate primary andsecondaryendpoints.For these endpoints, if at the time of data summary, a 
subject has diedor has not reached the end of the 12-week interval, thissubject will beincludedin 
the analysis.For other efficacy endpoints, thecollected records will be used (by visits or at 
specifiedtime point) as needed,depending onthepurpose of the summary.Please refer to the
individual endpointsection for details.
The efficacy cutoff date is defined as the minimum date amongdeath date, study discontinuation 
date, last dosedate + 20,and data cutoff date.For theprimaryand responder-related secondary 
endpoints, if at the time of data summary, a subject’s efficacy cutoffdate isbefore the end of the 
12-week interval or a subject hasany invalid hemoglobinrecords (i.e.,within 21 days following a
transfusion) during the specified 12-week interval, this subject willbe includedin the analysis and 
his/her responder status will beclassified in accordance with the definition of erythroidresponse in 
Section 10.2.For other efficacy endpoints, if a subject’s efficacy cutoff date is before the end of 
the 12-week interval, the subject will be included in the analyses.
Statisticalcomparisons will be made between luspaterceptandplacebo. Key secondary efficacy 
results that will be considered statistically significant after consideration of the strategy for 
controlling thefamily-wise Type 1 error rate are described in Section10.1. All statistical tests will 
be2-sided at the significancelevel of α = 0.05, and the corresponding p-valuesand 2-sided CIs for 
point estimates willbe reported, unless specified otherwise.
In general, descriptive statistics will be provided and statisticaltests will be applied if appropriate. 
Forcontinuous variables, least squares (LS) means with corresponding standard errors (SE) for 
each treatment group, along with LS mean of treatment difference (luspatercept versus placebo) 
with corresponding 95% CI and p-value will be presented for analysisof covariance(ANCOVA). 
Counts and percentages will be used to describe categorical variables, and the treatment 
comparison will be analyzed analogous to the primary efficacy endpoint, using the CMH model 


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stratified by baseline randomization stratification factor(s) The odds ratio (OR)(luspatercept 
versus placebo) with corresponding 2-sided (at 0.05 alpha level) 95% CI and p-value will be 
provided. The difference in proportions (luspatercept –placebo)and 95%CIwill also be 
calculated. A forest plot showing theORs,95% CI and p-value for the overall result and the results 
in each subgroup will be constructed for primary and key secondary endpoints. For all endpoints             
mentionedin this section, records beyond week 48 will not be used unless otherwisespecified. If 
ANCOVA is used, the statistical assumption will be validated first, log transformation will be 
applied as needed.
10.1 Multiplicity
Gate-keeping methods will be used to control the overallType1 error rate for the key secondary 
endpoints. Afterthe result from the primary efficacyanalysis in the ITT population shows 
statistical significance, the key secondary endpoint 1 will be testednext. The key secondary 
endpoint 2 will be tested onlyif the test results for bothprimary endpoint and the key secondary 
endpoint 1 are significant. The key secondary endpoint 3 will be tested only
 if the test results for 
primary endpoint and the keysecondary endpoints 1 and 2 are all significant. The testing 
procedure above will be implemented strictly in orderto control theoverall Type 1 error rate of 
0.05 due to multiplicity.
10.2 Analysis ofPrimary Efficacy Endpoint
The primary efficacy endpoint of this study iserythroid response, defined as an increase from
baseline ≥1.0 g/dL in mean of hemoglobin values over a continuous 12-week interval fromWeeks 
13 to 24 in the absence of transfusions. The response rate is defined as the number of responders 
divided by the number of subjects in the ITT population within each treatment group.
Baseline hemoglobin (Hb) is the average of 2 or more Hb measurements at least 1 week apart 
within 4 weeks prior toDose 1 Day 1.The Hb values within 21 days following a transfusion may 
be influencedby the transfusion and will be excluded from this analysis. For discontinued subjects 
who do not complete 24 weeksofthe DBTP, Hb data will continue to be collected. For a subject, 
if the Hb average over Weeks 13-24interval cannot be calculated due to missing data, the closest 
Hb 12-weekaverage will be usedas mentioned in Section5.1.  Ifthe12-week averageis still 
missing, theimputationmethod will be performed as described in Section 10.6.1and the responder
status will be classifiedin accordancewith the definition of erythroidresponse in Section 10.2.
The number and percentage of subjects in the ITT population who achieve the response will be 
calculated for luspatercept and placebo. The primary efficacy analysis for treatmentcomparison
(luspaterceptversus placebo) will beconductedby theCochran Mantel-Haenszel (CMH) test with
thetreatment and randomization stratification factor(s)in the model. The odds ratio (OR) 
(luspatercept versusplacebo)with corresponding95% confidence interval (CI) andp-valuewill be 
calculatedwithtreatmentgroup, randomization stratification factor(s)in the model to compare the 
luspatercept and placebo groupsat 2-sided 0.05 level.In addition, thedifference in response rate 


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between luspatercept andplacebo with corresponding 95% CIwill be calculatedbyexact 
unconditionaltest.
A forest plot showing theORs, 95% CI and p-valuefor the overall result and the results in each 
subgroup will beconstructed.Listing of individual Hbdata willbe provided.
The subgroup analyses described in Section 10.5.  including mean baseline Hb (>=8.5g/dLand 
<8.5 g/dL) for the primary endpoint will also be performedby summarizingtheresponse rate
differenceandORwithcorresponding 95% CI.
A sensitivity analysiswillbe conductedby classifying subjectswithless than 3 Hb measurements 
fromWeek 13 (-7 days) to Week 24 (+7 days)as non-evaluable and excludedin the analysis.  
Additionalsensitivity analysis will be conducted by classifyingthose non-evaluable subjects as 
non-responders.  Thesame sensitivity analysis will be followed for Hb secondary
 endpoints over 
Weeks 37 to 48. Additional sensitivity analyses forthe missing assessmentsarestated inSection
10.6.1.
10.3 Analyses of Key Secondary Efficacy Endpoints
The analyses ofkeysecondary efficacy endpoints will beperformed on the ITT population.The 
key secondary endpoints will be tested in theorder asmentioned from Section 10.1andlisted 
below:
1 Meanchange from baseline in NTDT-PRO Tiredness and Weakness (T/W) domain score 
over a continuous 12-week intervalfrom Week 13 to Week 24. 
2 Mean hemoglobin change from baseline over 12-week interval from Week 13 to 24 during 
the treatment periodin the absence of transfusions.
3 Proportion of subjects who havean increase from baseline ≥1.0 g/dL in mean of 
hemoglobin values over a continuous 12-week interval from Week 37 to Week48 inthe 
absence of transfusions.
To control the overall Type 1 error rate for secondary endpoints, the testing procedure will be 
implemented strictly in order: thetest for key secondary endpoint1will only be conducted when 
there isevidence showing that erythroid response is achieved in the luspatercept group from Week 
13 to Week 24 (primary endpoint).The key secondary endpoint 2 will be tested only if the test 
results for both primary endpoint and the key secondary endpoint 1 are significant. The key 
secondary endpoint 3 will be tested only if the test results for primary endpointand the key 
secondary endpoints 1 and 2 are all significant.
10.3.1NTDT-PRO (T/W Domain) Mean Change Between Weeks 13 to 24
The change from baselineonmean of NTDT-PRO (T/Wdomain) over a 12-week interval between 
Weeks 13 to 24 will be analyzed using analysis of covariance (ANCOVA) method with treatment 
group in the model and randomization stratificationfactor(s)as covariates.Treatment effect will
beevaluated as a contrast of luspatercept versus placebo.Least squares (LS) means with 


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corresponding standard errors(SE) for each treatment group, along with LS mean of treatment 
difference with corresponding 95% CI andp-value will be presented.  
Thesubgroup analysesincludingbaseline NTDT-PRO T/W (≥ 3 and <3) willbe performedas 
described in Section 10.5.  
The treatment-by-stratification-factor(s)interaction will be added to the ANCOVA model as a
sensitivity analysisand results from this model will be compared to theprimary fixed effects 
model (without the interaction effect).  If the interaction is significant at a 2-sided 0.1-alpha level, 
the nature of this interaction will be inspected as to whether it is quantitative (that is, the treatment 
effect is consistent indirection but not in size of effect) or qualitative (the treatment is beneficial in 
some values of the stratification factor(s)).  If the interaction effect is found to be quantitative, 
results from the primary fixed effect model will be presented.  If the interaction effect is found to 
be qualitative, further inspection will be used to identify in what values of the stratification 
factor(s) the treatment is more beneficial.
10.3.2Hemoglobin Mean Change Between Weeks 13 to 24 
Mean Hb change from baseline overa 12-week intervalbetween Weeks 13 to24 willbe analyzed 
using ANCOVA method with treatment group in the model and randomization stratification 
factor(s)as covariates. Treatment effect will be evaluated as a contrast of luspatercept versus 
placebo. Least squares (LS) means with corresponding standard errors (SE) for each treatment 
group, along with LS mean of treatment difference with corresponding 95% CI and p-value will be 
presented.
Baseline hemoglobin (Hb) is the average of 2 or more Hb measurementsat least 1 weekapart 
within 4 weeks priorto Dose 1 Day 1.The Hb values within 21 days following a transfusion may 
be influenced by the transfusion and will be excluded fromthis analysis. For discontinued subjects 
who do not complete 24 weeks of the DBTP, Hb data willcontinue to be collected. For a subject, 
if the Hb average over Weeks 13-24 interval cannot be calculated due to missing data, the closest 
Hb 12-week average willbeusedas described in Section5.1. Ifthevalue isstill missing, the
imputationmethod will be performed as described in Section 10.6.1.
Awaterfall plot will be provided for the hemoglobinchange from baseline by treatment group. 
Individual subject’shemoglobinchange from baseline will be displayed in a single bar. The 
displayedhemoglobinchange is each subject’s largest decreasein hemoglobin.
The subgroup analyses including mean baseline Hb (>=8.5g/dLand <8.5 g/dL) will be performed, 
as described in Section 10.5.  
10.3.3Hemoglobin Response Between Weeks 37to 48
Hemoglobin responder, defined as an increase from baseline ≥ 1.0 g/dLin mean of hemoglobin 
values over a continuous 12-week interval from Weeks 37 to 48 in the absence of transfusions will
be analyzed. 
Baseline hemoglobin (Hb) is the average of 2 or moreHb measurements at least 1 week apart 
within 4 weeks priortoDose 1 Day 1.The Hb values within 21 daysfollowing a transfusion may 
be influenced by the transfusion and will be excludedfrom this analysis. For discontinued subjects 
who do not complete 24 weeks of the DBTP, Hb data will continue to be collected.For a subject, 


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if the Hb average over Weeks 37-48 interval cannot be calculated due to missingdata, the closest 
Hb 12-week average will be used.  
The number and percentageof subjects in the ITTpopulation who achieve the response will be 
calculated forluspatercept and placebo. The odds ratio (OR) (luspatercept versusplacebo) with 
corresponding 95% CI and p-value will be providedand the CMHchi-square test will be 
conducted withtreatment groupandrandomization stratification factor(s)in the modelto compare 
the luspatercept andplacebo groups at 2-sided 0.05 level.The difference in proportions 
(Luspaterceptminusplacebo)withcorresponding 95% CI willbe calculatedbyexact 
unconditional test.
The subgroup analyses including mean baseline Hb (>=8.5g/dLand <8.5 g/dL) will be performed, 
as described in Section 10.5.  
10.4 Analyses of Other Secondary Efficacy Endpoints
The analyses ofother secondary efficacy endpoints will beperformed on the ITT population
except for the FACIT-Fand SF-36endpoints listed in this section.The analysesof NTDT-PRO, 
FACIT-F, andSF-36 endpoints will be conducted based on the Health Related QoLevaluable
population(Section 5.2.4).
10.4.1FACIT-FFatigue Subscale (FS): Mean Change from Baselinebetween Weeks 13to 24 
and Weeks 37 to 48
Mean FACIT-F FSscorechange from baseline over a 12-week intervalbetween Weeks 13 to 24 
(nominal Dose5to Dose 9) will be analyzed using ANCOVA method with treatment group, 
randomizationstratification factor(s)in the model and baseline FACIT-F FS score as covariate.
Thebaselineof FACIT-F FSis the scorefromthe last visit prior to or on Dose 1 Day1.
Mean change from baseline for Weeks 37 to 48 (nominal Dose13toDose 17) will be analyzed 
similarly.  
The subgroup analyses for Weeks 13-24 will be performed as described in Section 10.5.  
10.4.2NTDT-PRO SoBScore:Mean Change from Baseline between Weeks 13 to 24 and 
Weeks 37 to 48
Mean NTDT-PRO SoBscore change from baseline over a 12-week intervalbetween Weeks 13 to 
24 will be analyzed using ANCOVA method with treatment group, randomizationstratification 
factor(s) in the model and baseline NTDT-PRO SoB scoreas covariate. Similar analysis will be 
performed for Weeks 37 to 48.


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10.4.3Hemoglobin Mean Change Between Weeks 37 to 48
Mean Hemoglobinchange frombaseline over 12-week intervalbetweenWeeks 37to 48during 
the treatmentperiod will be analyzed using ANCOVA method with treatment groupand
randomization stratification factor(s) in the model as covariates.
Baseline hemoglobin (Hb) isthe average of 2 or more Hb measurements at least 1 week apart 
within 4 weeks prior to Dose 1 Day 1.The Hb values within 21 days following a transfusion may
be influenced by the transfusion and will be excluded from this analysis.For discontinued subjects 
whodo not complete 24 weeks of the DBTP, Hb data will continueto be collected.For a subject, 
if the Hb average over Weeks 37-24 interval cannot be calculated due to missing data, the closest 
Hb 12-week average willbeused.  
10.4.4NTDT-PRO (T/W Domain) Mean Change BetweenWeeks 37to 48
Mean NTDT-PRO (T/W domain) changefrom baseline over a 12-week intervalbetween Weeks 
37to 48(nominal Dose 13 to Dose 17) will be analyzed using ANCOVAmethod with treatment 
groupandrandomizationstratificationfactor(s)in the modelas covariates. 
The treatment-by-stratification-factor(s)interaction will be added to the ANCOVA model as a
sensitivity analysisand results from this model will be compared to the primary fixed effects 
model (without the interaction effect).  If the interaction is significant at a 2-sided 0.1-alphalevel, 
thenature of this interaction will be inspected as to whether it is quantitative (that is, the treatment 
effect is consistent in direction but not in sizeof effect) or qualitative (the treatment is beneficial in 
some values of the stratification factor(s)).  If the interaction effect is found to be quantitative, 
results from the primary fixed effect model will be presented.  If the interaction effect is found to 
bequalitative,further inspection will be used to identify in what values of the stratification 
factor(s) the treatment is more beneficial.
10.4.5FACIT-F Fatigue Subscale (FS)Response at Weeks 13 to 24 and Weeks 37 to 48
Proportion of subjects with anincreasefrom baseline ≥ 3 in mean FACIT-FFSscore, over Weeks 
13 to 24in the luspatercept groupwill be compared with the placebo group. The CMH test will be 
used with baseline FACIT-F FScategory ≥ 37versus < 37as the stratum to compare the response
rates between the 2 groups. The selection of 37 as a thresholdis based on a Phase 2 Luspatercept 
study (A536-06) in which it corresponds to a NTDT-PRO T/Wdomain scores of 4.The 
corresponding 95% confidenceinterval forodds ratio will also be provided.Similar analysis will
be performed for Weeks 37 to 48.
10.4.6SF-36v2: Mean Change from Baseline at Week24and Week 48
The SF-36Version 2.0(acute condition with 1-week recall period) is a self-administered 
instrument consisting of 8 multi-item scalesthat assess 8 health domains:Physical functioning
(PF), Role-Physical(RP), Bodily Pain(BP), General Health(GH), Vitality(VT),Social 
functioning(SF), Role-Emotional(RE), and Mental Health(MH). Two overallsummary scores, 
Physical Component Summary (PCS) and Mental Component Summary (MCS), will be calculated 
from the 8 health domains. The primary interests of the SF-36 are the PCS and MCSnorm-based 
scores.


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Scores for each domain and composite summary scale of the SF-36 will be derived using the 
QualityMetric’s Health Outcomes™ Scoring Software 5.1,asoftware designed to provide 
standardized scoringmethods for the SF-36 based on the 2009 US general population normative 
data(Maruish, 2011).The scoring algorithm, using the 1998 US general population normative data 
as an example, for the SF-36 is shown inAppendix 18.3.3.
Summarystatistics(n, mean, median, SD, range)forPCS and MCS norm-based scoresalong with 
the change from baseline will be summarizedat Weeks 12, 24, 36, and 48for each treatment 
group.The Norm-base scores will be used fordomain analysis and thePCS analysis.The raw 
scores for each individual questionand the calculated domain and component scores will be 
presentedin the listings for SF-36.
A mixed effectrepeated measure model will be used with interceptand timeas therandom effect. 
The model includesthe change from baseline scores up to Week 48 as the outcome, and treatment 
group assignment, time (weeks since Dose 1 Day 1), baseline scores, randomization stratification 
factor(s),time-by-baseline score, and time-by-treatment group assignment termsin themodel.The 
unstructured covariance matrixwill be usedto obtain the random effects variance components.
If the MMRM model using an unstructured covariancematrix fails to converge with the default 
Newton-Raphson algorithm, the Fisher scoring algorithm or another appropriate method will be 
used to provide initial values of the covariance parameters.In the rare event that none of the above 
methods yields convergence, a structured covariance, such as heterogeneous Toeplitz and Toeplitz 
structures, will be used to model the correlation among repeatedmeasurements. In this case, the 
empiricaloption will be used because the sandwich variance-covariance estimator is 
asymptotically consistent.
To assess the extent of missingdata at each assessment visitbytreatment group,compliance rates 
for the SF-36 will be estimated on the ITT population separately based on the number of subjects 
included in the ITT population per treatmentgroup who are eligible for assessment at a given 
scheduled visit.Subjects willbe considered compliant withcompletion of theSF-36 assessment if 
at least half ofthe 36 items (i.e., ≥ 18 items) are completed.
Additional details of the highlighted analyses as well as sensitivity analyses, and additional 
analyses to assesssubgroups and treatment effects on HRQoL are provided in a separate HRQoL 
statistical analysis plan,whichwillbe finalized prior to database lock. The HRQoL statistical 
analysis planwill be appended to the separate specific HRQoLreport.
10.4.7Mean Change in mean Daily Dose of Iron Chelation Therapy
The ICT mean daily dose summary will be providedforsubjects who didnot change ICT drug 
from baseline to post-baseline and only one ICT drug has been used. Descriptive statistics for 
meandaily dose will be summarized at baseline and the post-baseline visit for each ICT drug. The 
baseline mean daily dose will be calculated using the ICT dosage during the 24weeksonor prior
to first study drug treatment and the post-baseline mean daily dose is calculated duringthe last24
weeks of the 48-week double-blind treatment period or the last 24weeks of the studytreatment for 
early discontinued subjects.


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The same descriptive statistic summary for baseline and post-baseline ICT drug mean daily dose 
will be provided for subjects in each baseline liver iron content category (<3;>=3-<=5; >5-<=7; 
>7-<=15; >15mg/g dry weight).
The change from baseline in mean daily dose at post-baseline will be analyzed using an ANCOVA 
model with treatmentgroup, randomizationstratification factor(s)andbaseline ICTmean daily 
dose as covariatesbased ontheITT population for subjects who did not change ICTdrugfrom 
baseline topost-baseline and only one ICT drug has been used.
A summary showing the number and percentage of subjects whotookmonotherapy (i.e., onlyone 
ICT drug) vs. combo therapy (i.e., more than one ICT drug) at the 24-weekbaseline period and 
post-baseline period will be provided.
Bar plot will beprovided for percent of subjects who took each ICT drug at baseline and 
postbaseline forsubjectswhodid not change ICT drug from baseline to post-baselineand only one 
ICT drug has been used.A similar bar plot will be provided for percent of subjects who took 
monotherapy or combo therapy at baseline and post-baseline.
10.4.8LIC /ICT: ResponderAnalysisat Week 24 and Week 48
There are 3 scheduled LIC measurements for each subject: baseline, Weeks24 and48. For 
subjects who discontinued before 48 weeks, theLIC and ICTdata may be collected in the PTFP
.
The value of LICwill be either thevaluecollected from eCRF or the value derived from T2*(see 
section 10.4.10for further details). ICT daily dosing data will be collected at every visit during the 
study.  Baseline ICT dose isbased onmedical history over 24 weekspriortoDose 1 Day 1.
At Week 24, a LIC/ICT responder will be defined as one of the following:
Baseline LIC (by MRI) ≥3 mg/g dw: ≥20% reduction in LIC, OR, ≥33% decrease in ICT 
daily dose
Baseline LIC < 3 mg/g dw: no increase in LIC > 1 mg/g dw ANDnot startingtreatment 
with ICT or no increase in ICT daily dose ≥ 33%, if on ICT at baseline
CMH test will be performed with treatmentgroup, baseline ICT use (Yes, No) and randomization 
stratification factorsasstratato compare the luspatercept and placebo groups at2-sided 0.05 level; 
thecorresponding 95% confidence interval for odds ratio will also be calculated.
The subgroup analyses will be performedas described in Section10.5.  
10.4.9Serum Ferritin: Mean Changefrom Baseline at Week 24 and Week 48
Descriptive statistics forserum ferritin level will be summarizedat baseline, at Week 24 and Week 
48of the 48-week DBTP. The baseline mean serum ferritin is measured during the 24weeksprior 
tothe first dose and the post-baseline mean serum ferritin is calculated during the last 24weeks of 
the 48-week double-blindtreatment period or thelast 24weeks of the study treatment for early 
discontinued subjects.Changefrombaseline will besummarizedat Week 24 and Week48.


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The change from baseline in serum ferritin at Week 24and Week 48will beanalyzed using an 
ANCOVAmethod with treatment group and randomization stratification factor(s)in themodel 
and baselineSerum Ferritin as the covariate.Ifthe normality assumption is significantly deviated, 
the nonparametric Wilcoxon rank-sum test willbe used instead.Mean change at Week 48 will be
analyzed similarly.
All the serum ferritin data will be presented in a listing.
10.4.10Liver Iron Concentration: Mean Changefrom Baseline at Weeks 24 and 48
LIC mean change from baseline at Week 24 will be summarized descriptively and analyzed using 
ANCOVA method with treatment group and randomization stratification factor(s) in the model 
and baselineLICas covariates. 
LIC mean change from Baseline at Week48 will be analyzed similarly.
The value of LIC will be either the value collected from eCRF orthe value derived from T2*,R2*
or R2 parameter depending on which techniques and software were used for MRILICacquisition 
and post-processing.The LIC value will be derived as below:
Technique
Site number
Derivation source
Alternative derivation if still 
missing
T2*/R2*
0.0254 * (R2*) + 0.2
25.4/T2* +0.2
If bothR2*and T2* are missing, 
LIC from eCRF will be used
T2*/R2*
25.4/T2* + 0.2
If both T2* andR2*are missing, 
LIC from eCRF will be used
T2*/R2*
 
31.94 * (T2*)^-1.014 0.029*(R2*)^1.014
If both T2* and R2* are missing, 
LIC from eCRF will be used
Ferriscan R2
Reported LIC from
CRF
(29.75-SQRT(900.7-2.283*EXP
((-0.19043+1.016385*
ln (R2)) /0.983615)))^1.4265
The derived LIC value will beused for analysis. If a subjecthas any LIC value > 43, thesubject’s
LIC value will be excludedfrom analysis. Note that, subjects with LIC value > 43 arenot excluded 
from the LIC baseline summary and efficacy subgroup analysis by LIC categories.


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Descriptive statistics for LIC measurements and change from baseline will besummarizedatweek 
24/48. The 24/48-week LIC change from baseline will be analyzed using ANCOVA modeland 
randomization stratification factor(s) in the model and baseline LICas covariates.Additionally, a 
shift table representing theshift fromthe baseline to week24/48category (<3;>=3-<=5;>5-<=7; 
>7-<=15;>15mg/g dry weight) willbe provided for LIC. Asubject will havemaximum two post-
baseline LIC assessments (including “unscheduled”) during the 48 weeksdouble-blinded treatment 
period per protocol. The assessment will be counted asthe closest visit (“Week 24”or “Week 48”) 
based onits actualassessment date.  Thislogic will be used in model based summary, change from 
baseline summary and theshifttable summary.
Additionally, bar plot will beprovided forbaseline, week 24 and week 48LIC categories (<3; 
>=3-<=5; >5-<=7; >7-<=15; >15mg/g dry weight). Percent of subjects withineach category will 
be displayed by treatmentgroup. All the LICdata will be presented in a listing.
10.4.11Transfusion Free for 24 and48 weeks
Proportion of subjects who receivenoRBC transfusionsfrom Week 1 to Week 24will be 
summarized and compared betweenthe 2 treatment groups using CMH test with randomization 
stratification factor(s) adjusted.
Similarly,proportion of subjects who receive no RBC transfusion from Week 1 to Week 48 willbe 
compared between the 2 treatment groups using CMH test with randomization stratification 
factor(s) adjusted.
10.4.12Hemoglobin Increasefrom Baseline ≥1.0 g/dLResponseBased on Rolling Method
The hemoglobinresponsewill bemeasured using the consecutive “rolling”12-week and24-week
time intervalswithinthe entire studyperiod up to the efficacy cutoff, i.e., Days 2 to 85,Day 3 to 
86 for 12-week (or Day 2 to 169, Day 3 to 170for 24-week) and so on. Note that, Day 1 
hemoglobinbelongs to baseline. Thehemoglobinresponseis defined as subjects with ≥ 1.0 g/dL
increasein meanfrombaselineduring any consecutive rolling 12-week (or 24-week)timeinterval
in the absence of transfusion. The Hb values within 21 daysfollowing a transfusion may be 
influenced by the transfusion and will be excludedfrom thisanalysis. 
The treatment comparison with “rolling” method (luspatercept versus placebo)will be conducted 
by the CMH test stratified by the randomizationstratification factors. The OR (luspatercept versus 
placebo) with corresponding2-sided (at0.05alpha level) 95% CI and p-value will be provided. 
The number and percentage ofresponders will be summarized by each treatment group and the 
difference in proportions(luspatercept –placebo)and corresponding 95% CI will also be 
calculated by exactunconditional test with “rolling”method as well.
10.4.13Duration of Mean Hemoglobin Increase from Baseline ≥1.0 g/dL


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To measure the duration of hemoglobinresponse(for the ≥ 1.0 g/dL criterion), both the 12-week 
and24-weekrolling methodsmentioned from Section10.4.12will beapplied. 
Thedurationofthe longestcontinuous12-week (or 24-week) basedhemoglobin responsewill start 
from the first day of the first rolling 12-week(or24-week)intervalthatachieves mean Hb increase 
from baseline ≥ 1.0g/dLwith the exclusion of hemoglobin assessments within 21 days after 
transfusion. It will end with the last day of the lastconsecutive rolling 12-week (or24-week)
intervalthat maintains mean Hb increase from baseline ≥ 1.0 g/dL.
The Kaplan-Meier plotsof duration of mean hemoglobin increasefrom baseline ≥ 1.0 g/dL over 
rolling 12-week(or 24-week)time interval, defined as timefrom the start of the longest response 
to end of the response,will be provided. The median duration, 25thand 75thquartiles with the 
associated 2-sided (at0.05 alpha level) 95% CIs will be presented for each treatment group.
Descriptive statistics willalso be generated for the durationfor each treatment group.
The duration of the individual continuous response is defined as the number of days between the
First andLast Daysof Response, i.e. Last Day of Response –FirstDay of Response + 1,wherethe
First Day of Responseisthe first day of the first 12-week interval when the subject meetsresponse
requirement, and the Last Day of Response isthe last day ofthelast 12-week(or24-week)
interval when the subject meets responserequirement.  The subject must meet the response
requirementon all the days within the entireduration.
For subjects who have one response and continue to respond at the efficacy cutoffdate,the end
day of the response will be censored at the date of efficacy cutoff and the duration of responsewill
be calculated as date of efficacy cutoff –first day of response+ 1,where date of efficacy cutoff is 
defined in Section 10.  For subjectswho have multiple responses andtheirlastresponsescontinue
onthe efficacycutoff date, the longest responsewill be the last one if the duration from the
response start tocensoring is longer than all the previously occurred response durations. If the
continuingresponse duration is not the longest compared with the previously occurringresponses, 
theresponse withthe longest duration will be selected. Summary statistics will be provided for the 
totalduration of hemoglobin responsewithin the entire study periodand the ratio of the total 
response duration versus entire study duration. The entire study duration isdefined as period from 
Day 2 to dateof efficacy cutoff.
10.4.146MWT: Mean Change at Week 24 and 48
For 6MWT assessments, mean changes from baseline at Weeks 24 and 48 will be summarized 
descriptively and analyzed using ANCOVA method with treatment group,randomization 
stratification factor(s)and baseline 6MWT value as the covariates. In addition, subgroupsof 
subjects with baseline 6MWT ≤ 450 metersand >450 meters will be performed.  Other subgroup
analyseswill be addedas described in Section 10.5.  
Mean changes from baseline at Week 48 will be analyzed similarly.


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10.4.15Proportionof Mean Hemoglobin Increase from Baseline ≥1.5g/dLat Week 13 to 24
Similar to the primary efficacy analysis, the proportionof subjectswho have anincrease from 
baseline ≥1.5 g/dL in meanof hemoglobin values over a continuous 12-weekinterval from Week 
13 to Week 24in theabsence of transfusionswill be performed on the ITT population. The Hb 
values within 21 daysfollowing a transfusion may be influenced by the transfusion and will be 
excludedfrom this analysis. Cochran-Mantel-Haenszel (CMH) testwill be performed with 
treatment group and randomization stratificationfactor(s) in the model to compare the treatment 
and placebo groups at 2-sided 0.05 level.
10.4.16  Proportionof subjects witha decrease from baseline ≥ (RD) in mean NTDT-PRO 
T/W score, over Weeks 13 to 24 and Weeks 37 to 48
The responder definition (RD) threshold is the individual subject score change over a
predetermined time period that will be interpreted as a treatment benefit.The RDthresholdof 1
for the NTDT-PRO is jointly determined bylongitudinal anchorbasedand distribution-based
methods prior to database lockusing data collected over a 12-week window between Weeks 13to 
24(
 
).
Proportionof subjectswith a decrease from baseline ≥ RD(=1) in mean NTDT-PRO T/W score, 
over Weeks 13 to 24and Weeks 37 to 48 in the luspatercept group will be compared with the 
placebo group. The CMH test will be used with baseline NTDT-PRO T/W category ≥ 3 versus <3 
as thestratum to compare theresponse rates between the 2 groups. The corresponding 95% 
confidence interval for odds ratio will also be provided.
Thecumulative distribution function (CDF) of observed changes in NTDT-PRO T/W over a 
continuous period ofWeeks 13 to 24 and Weeks 37 to 48 from baseline will be generated by 
treatment group. The CDF curve presents the entire distribution of responses and showsa 
continuous plot of the entire range of changes from baseline at a given post-baseline visit on the x-
axisand the cumulative percentage of subjects experiencing a change up to a particular level on 
the y-axis.
10.4.17Time from First Dosing Date to the First Mean Hemoglobin Response
To measure the time to the first hemoglobinresponse(for the ≥ 1.0 g/dLcriterion)in the absence 
of transfusions,both 12-week and 24-weekrollingmethods mentioned from section 10.4.12will 
beapplied.
The descriptive statistics for the time from firstdosing date to the first 12-week (or 24-week) mean 
hemoglobin increaseresponse (for the≥ 1.0 g/dL criterion) will be provided by treatment group, 
where time from first dosing date to the first Hbincreaseresponse is defined as FirstDay of 12-
week (or 24-week) Response –Date of First Study Drug +1. The difference in time from the first 
dosing date to the firstHbincreaseresponse (luspatercept –placebo), corresponding 95% CI and 
p-value will be calculated by t-test. Only subjects who have a response willbe included.


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10.4.18Longitudinal Analysis of Hemoglobin Mean Change from Baseline
A mixed effectrepeated measure modelwill be used with intercept and timeasthe random effect
to evaluate the hemoglobin change from baselineat Weeks12,24,36 and 48. The model includes
theweeklychange from baseline up to Week 48, and treatment group assignment, time (weeks
since Dose 1 Day 1), baseline hemoglobin, randomizationstratification factor(s), time-by-baseline 
score, and time-by-treatment group assignment termsin the model.The unstructured covariance 
matrixwill be usedto obtain the random effects variance components.
If the MMRM model using an unstructured covariancematrix fails to converge with the default 
Newton-Raphson algorithm, the Fisher scoring algorithm or another appropriate method will be 
used to provide initial values of the covariance parameters.In the rare event that none of the above 
methods yields convergence, a structured covariance, such as heterogeneous Toeplitz and Toeplitz 
structures, will be used to model the correlation among repeated measurements.In this case, the
empiricaloption will be used because the sandwich variance-covariance estimator is 
asymptotically consistent.
10.5 Subgroup Analysis
The primary and key secondaryefficacy endpoints alongwiththe FACIT-F FS score, LIC/ICT 
responseand 6-minute walk testwillalso be summarized for the following subgroups: 
1. Geographic region:
North America and Europe
Middle East 
Asia-Pacific
2. Age:

≤ 32years

>32years
3. Splenectomy:

Y

N
4. Sex:
Male
Female
5. Beta-Thalassemia diagnosis:
Beta-Thalassemia


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Hemoglobin E/Beta-Thalassemia
Beta-Thalassemia combined with Alpha-Thalassemia; 
6. Baseline liver iron content
<3mg/g dry weight
>=3 -<= 5 mg/g dry weight
> 5 -<= 7 mg/g dry weight
>7 -<= 15 mg/g dry weight
> 15mg/g dry weight
7. Mean baseline Hb (mean of at least 2 Hbvalues byCentral Lab during the 28 days 
screening period) (g/dL)
>=8.5g/dL  
<8.5g/dL
8. Baseline NTDT-PRO T/W Score 
a. ≥ 3 points
b. < 3 points
9. Baseline 6MWT
a. ≤ 450 meters
b. > 450 meters
10.Baseline FACIT-F FS Score
a. ≥ 43
b. <43
A forestplot showing the odds ratios, 95% CI and p-value for the overall result and the results in 
eachsubgroup will be constructedfor primary and key secondary endpoints.
10.6 Handling of Missing Data or Dropouts
10.6.1Missing Data for non-QoLAssessment
In order to assess the robustness of the findingsonthe primary and key secondary endpointsof 
hemoglobin response and change from baseline,the missing valueswill be imputed as follows:
For binary responder/non-respondervalues, the non-responder imputation(NRI)methodis 
used for primary analysis.The NRI method classifies all subjectswith missing dataas non-


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responders.  The supportive/sensitivity analysiswillinclude thecomplete case analysis.The 
complete case analysis excludes all subjects with missing data.  
Tipping point analysismay be conductedfor the primary efficacy endpointif necessary.
Differentnumber of respondersbetween luspatercept and placebowillbe assessed until the 
study conclusion is changed. Eachimputed value is initially imputed as a non-responder. The 
imputed values in the luspaterceptgroup will remain asnon-responders while the imputed 
values in the placebogroup are replaced as a responderone at a time,therefore changing the 
number of respondersbetween groups. Once all imputed values in the placebogroup have 
been replaced with respondervalues, one of the imputed values in the luspaterceptgroup is 
replaced with a responder whileall the imputed values in the placebogroupare reset to all non-
responders.  This process of changing eachimputed non-responder to a responderone at a time
continues until all the imputed values in the luspaterceptand placebo groupsare changed to 
responders.  
In this way,every pair of imputations between the placebo and luspaterceptgroupswill be 
assessed similarly, creatingamatrix of all possible missing patterns.  At each iteration, the 
statistical analysis is assessedto result in a significantor non-significantp-value, and the result
of the analysis is recorded. Atablewill be provided to identify atwhat point to which the 
difference in responder status causesa directionalshift inthe study result.
For continuousvalues, the complete caseanalysisis the primary analysis.  The 
supportive/sensitivity analysis will use the postbaseline meanimputation, the baseline 
imputation or multipleimputation(MI)method.
In the case of any missing data for hemoglobinand LIC from MRI,imputation will be applied for 
each section.The imputation logic for missing LIC value is stated in Section10.4.10: the value of 
LIC will beeither the value collected fromeCRF or the value derived from T2*, R2* or R2 
parametersdepending on which techniques and software were used forMRI LIC data acquisition.
10.6.2Missing Datafor QoL Assessment
For continuous and categorical QoL assessments, thecomplete case analysisisused forthe 
primary analysis.  For thekey secondary endpoint, NTDT-PRO T/W domain scoreatWeek 13-24, 
the supportive/sensitivity analysis will use the postbaseline meanimputation, the baseline 
imputation or multiple imputation (MI) methodsto assess the robustness of the primary result. 
Toassess the extentof missing data at eachassessment visitby treatment group, compliance rates 
forthe NTDT-PRO, FACIT-F, and SF-36assessments at each scheduled visit will be provided.  
The compliance rate for each assessment at eachvisitis defined asfollows:


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NTDT-PRO: The number of subjects with at least half of 6 weekly item scoresfor that
week being non-missing (i.e., ≥ 3 items)divided bythe number of ITT subjects who are 
still expected to provide PRO assessment at that time point.
FACIT-F: The number of subjects with at least 80% of the 40 items (i.e., ≥ 32 items) for 
that visit being completeddivided bythe number of ITT subjects who are still expected to 
provide FACIT-Fassessment at that time point.
SF-36:The number of subjectswithat least 50% of the 36 items (i.e., ≥ 18 items) for that 
visit being completeddivided bythe number ofITT subjectswho are still expected to 
provide SF-36assessment at that timepoint.


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11 
SAFETY ANALYSIS
The purpose of this sectionis to define the safety parameters for the study. All summaries of safety 
data will be conducted using the safety population. Thesafetyanalysis includes adverse events 
(AEs), clinical laboratorytests,vital signs, electrocardiogram (ECG),echocardiography,
erythropoietin, left ventricular ejection fraction (LVEF), and antidrug antibody (ADA) testing.In 
addition, pregnancy test and menstrual statusassessments will be provided for female subjects.
If not otherwise specified (for example, adverse events), safety summaries will use all collected 
records.
11.1 Adverse Events
Adverse events will be analyzed in terms of treatment-emergent adverse events(TEAEs) which are 
defined as any AEs that begin or worsen on or after the start of study drug through 63days after 
the last dose of IP(i.e., AE start date on or after th
e first dose date and within last dose date+ 63). 
In addition, anAE that occurs beyond this timeframe and that is assessed by the investigator as 
possiblyrelated (suspected) to study drug will be considered astreatment-emergent.
All AEs will be coded using the Medical Dictionary for Regulatory Affairs® (MedDRA) 
dictionary.The incidence of TEAEs will be summarized by MedDRA system organclass (SOC) 
and preferred term (PT).The AE tables will besorted bySOC and PT(within SOC) indescending 
frequency within the luspatercept group.If a subject experiences multiple AEs under thesame PT 
(or SOC), then the subject will be counted only once for that PT(or SOC).
The intensity of AEs will be graded1 to 5 according to the National Cancer Institute Common 
Terminology Criteria for Adverse Events (CTCAE) Version 4.0. If a subject experiencethe same 
AE more than once with different toxicity grades, then the event with the highest grade will be 
tabulated in“by grade” tables. In addition, AEs with a missing intensity will be presented in the 
summary table as an intensity category of “Missing”only if the same event category has no other 
valid grades.
Tables summarizing the incidence of TEAEs will be generated foreach of the followingby 
treatment group(if not otherwise specified, the summary is by SOC and PT):
TEAEs;
TEAEs by SOC only;
Treatment-related TEAEs;
Serious TEAE;
Treatment-related serious TEAEs;
TEAEsby CTCAE maximum severity
Treatment-relatedTEAEsby CTCAE maximum severity
TEAE with CTCAE Grade ≥ 3; 


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Treatment-related TEAE with CTCAE Grade ≥ 3;
TEAEs leading tostudy drug discontinuation;
Treatment-related TEAEs leading tostudy drug discontinuation;
TEAEs leading tostudy drugdose reduction;
Treatment-related TEAEs leading tostudy drug dose reduction;
TEAEs leading to death;
Treatment-related TEAEs leading to death;
Most frequent TEAEs by PT (≥ 5% inPT frequency ofall subjectsor subjects from any 
treatment group);
Most frequent TEAEs by SOC (≥ 5% inSOC frequency of all subjects); 
Most frequent TEAEs by SOC and high level term (HLT) (≥ 5% inHLT frequency of 
all subjects);
TEAEs by Age group (≤32years, >32years); 
TEAEsby Age group (≤32years, 32-≤ 50years, > 50 years);
TEAEs by Gender(male and female); 
TEAEs by Splenectomy status (Yes/No); 
TEAEs by ADA status (positive preexisting, positive treatment-emergent, negative);
TEAE by preferred term for QTC Prolongation and Atrial Fibrillationevents;
All death by cause of death; 
Listings for AEs, SAE, and AEs leading to drug discontinuation will be presented separately. 
Treatment-emergent AEs will be flagged in the listings. A death listing will be provided for all 
death events.
11.2 Adverse Eventsof Special Interest
The following adverse events are of special interest:
Malignancy
Premalignant Conditions. 
An AESI summary by PT terms will be provided for TEAEs by treatment group.  A listing for 
AESI will be provided as support.
To evaluate the timing of AESI onset, descriptive statistics will be provided for time to first AESI 
occurrence after treatment by treatment groupA listing for AESI will be provided as support.


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11.3 Other Adverse Events That Require Safety Analysis
Other adverse events that require safety analysis include AEs that fall under the “Embolic and 
Thrombotic Eventsand Thrombophlebitis” SMQ category and AEs with PT “Bone pain”and 
‘Hypertension’.
Similar to AESI, summary will be provided for AEs that fall under the “Embolic and Thrombotic 
Eventsand Thrombophlebitis”SMQ category by preferred term. For “Bone pain”events,number 
of subjects with bone pain events by worst CTCAEgrade will be provided from grade 1 to grade 
5. The number and percentage of subjects with bone pain occurred during the first 24 weeks and 
after 24 weeks will be provided. Summary statistics will also be provided for time to first bone 
pain, total duration of bone pain (in days), total duration of bone pain that occurred during the first 
24weeks (in days), and total duration of bone pain that occurred after 24 weeks (in days). Total 
duration of bonepain is defined as sum of all bone pain duration within a subject, excluding 
overlapped period. Same summaries are also conducted on ‘Hypertension’.
The “Embolic and Thrombotic Eventsand Thrombophlebitis” SMQ category analysis will include 
subgroup analysis by splenectomy status, platelet above ULN, concomitant medications, and 
comorbidities as needed.
11.4 Clinical Laboratory Evaluations
Clinical laboratory data is collected by central lab and local lab.Lab data will be collected over
time during the study.All summaries will be based on the SI units andmissing values will not be 
imputed. Clinical laboratory values will be graded(grade0-4)according to NCI-CTCAEversion 
4.0for applicable tests. Normal ranges will be used to determine the “High”, “Low”, and 
“Normal”categories for allnumeric laboratory tests. Only central lab results and local lab 
“Reticulocyte(Blood)” parameter will be used fortable summaries.
11.4.1Hematology/Chemistry/Immunology
The laboratory results and change from baseline will be summarized byvisit by treatment group
for central lab hematologyandchemistry panels separately.
A shift table representing the shift from the baseline grade to maximum NCI-CTC Grades (high or 
low)will beprovided for selected hematology and chemistry parameters having toxicity grade by
visitbytreatment group.The shift summary for high category will be done for hepatic function 
parameter (ALT, AST, ALP, total bilirubin)andrenal function parameter (serum creatinineand 
eGFR by MDRD). The shift summary forlow category will be done for hematology parameter
(platelets, leukocytes and absolute neutrophil counts).
To estimate theincidence ofsubjects who have passedthe predefined thresholdfor selected 
parameters, a summary table representingthe numberandpercentage of subjectswith lab 
assessments satisfying the threshold criteria will be providedby treatment group. A subject with 
post-baseline result(including “unscheduled” visits)meeting the criteria will be counted. The 
thresholdcriteria include below:
LIVER FUNCTION


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Post-baseline Alanine Aminotransferase (ALT)
≥3x upper limit of normal (ULN)
Post-baseline AspartateAminotransferase (AST)
≥3x ULN
Post-baseline TotalBilirubin (BILTOTAL) 
≥2x ULN
Post-baseline ALT/ASTand BILTOTAL
(ALT≥3x ULN or AST≥3xULN)and 
BILTOTAL≥2x ULN
RENAL FUNCTION
Post-baseline eGFR by MDRD(CREATCLR)
< 0.5x baseline
Post-baseline Serum Creatinine (CREAT)
> 2x baseline
Albuminuria Category (ACR: mg/g)
<30 
≥30-≤300 
>300-≤1000
>1000-≤3500
>3500
HEMATOLOGY
Post-baseline Leukocytes (WBC)
≥2x baseline and >ULN
≥3x baseline and >ULN
≥2x baseline and >ULN and lasts for at 
least 42 days
≥3x baseline and >ULN and lasts for at 
least 42 days
Maximum Post-baseline Platelets (PLAT)
≥1.5x baseline and > ULN
≥600 -<1000x10^9/L
≥1000 x 109/L
Specifically, thethreshold summary for platelets will be based on the maximum post-baseline 
value. The summary will be provided by baseline category based on normal range (ie, within 
normal limitat baseline,>upper limit at baseline), and by splenectomystatus(Yes, No)in 
separatetables. Furthermore, the number and percentage of subjects withmaximum post-baseline
WBC exceeding 3x baseline value and >ULN, maximum post-baseline WBC exceeding 3x 
baseline value and > ULN andlasts for at least 42 days, and subjects with maximum post-baseline 
platelets ≥600 -<1000x10^9/Land maximum post-baseline platelets exceeding 1000 x 109/L will 
be providedseparatelyby splenectomystatus(Yes, No).
For some key lab parameters(ALT, AST, WBC), plots will be presented to show thepattern of the 
lab test values overtime by treatment group.Mean and SE will be presented in the plot.


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Listings of clinical laboratory data will be provided for central lab and local lab respectively for 
each panelin safety analysis(excludingserum erythropoietin and serum ferritin). Abnormal 
observations will be noted.Specifically, subjects with any WBC differential count exceeding 2x 
baseline value will be listed in a separate listing. All WBC differential count records of qualified 
subjects will be presented.
11.4.2Serum Erythropoietin
Serum erythropoietin are collected from central laboratory. The summary of serum erythropoietin 
test results and change from baseline will be provided by visit by treatment group. A plot will be 
presented to show the pattern of the serum erythropoietin test results over time by treatment group. 
Mean and SE will be presented in the plot.  A listing will be provided.
11.4.3Local lab “Reticulocyte (Blood)” parameter
The “Reticulocyte (Blood)”parameter is only collected atlocal lab. Thesummary of absolute
reticulocyte count and change from baseline will be provided by
 visit and treatment group in the
same way as other lab parameters.
A line plot will be presented to show the pattern of the reticulocyte test results over time by
treatment group. Mean and SE will be presented in the plot.
11.5 Vital Sign Measurements
Vital signis collected overtime during the study. Vital sign parameters includeweight, 
temperature, pulse rate, seated blood pressure (diastolic blood pressure [DBP]and systolic blood 
pressure [SBP]). The DBP and SBP are collected twice at each visit with 10 minutesapart. The 
average of the two assessments will be used. Summary statistics of observed values and change 
from baseline values will be presented for each parameter byvisit by treatment group.
To further estimate the incidence of subjects whose maximum post-baselineblood pressurehave 
passedselected criteria, summary tables representing the numberand percentage of subjectswith 
post-baseline (including ‘unscheduled’visits) SBP/DBP assessments satisfying each criterionwill 
be providedby treatment group. The selected criteria includebelow:
Maximum post-baseline SBP
No increase
Increased < 20 mmHg
Increased ≥20 mmHg
Increased ≥20 mmHg and SBP ≥140 mmHg
Increased ≥20 mmHg and SBP ≥150 mmHg
Subjects only with baseline values
Maximumpost-baseline DBP
No increase


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Increased < 20 mmHg
Increased ≥ 20 mmHg
Increased ≥20 mmHg and DBP ≥100 mmHg
Subjects only with baseline values
A plot will be presented to show the pattern of the SBP and DBP test results over time by
treatment group. Mean and SE will be presented in the plot. Additionally, a spaghetti plot forSBP 
and DBP values overtime for individual subjects with maximum post-baseline SBPincreased ≥20 
mmHg and SBP ≥150 mmHg or maximum post-baseline DBPincreased ≥20 mmHg and DBP ≥
100 mmHg will be provided.Correspondinglisting will be provided for vital sign data. 
11.6 Electrocardiograms
The 12-lead ECGis collected over time at selected visits. ECGparameters includeheart rate, PR 
interval, QRS duration, RR intervalandQTinterval. The RR interval value will bederived per 
formula: RR interval (msec)=60000 (msec)/heart rate (bpm). The corrected value for QT interval 
will be derived based on Fridericia
's formula as below:
Fridericia
's formula: QTcF= QT/(RR)
1/3
where RR is the calculated RR interval as above
The calculated RR interval value, recorded values of ECG parameters and change from baseline 
values will be summarized by visit by treatment group. 
To further estimate the incidence of subjectswhose baseline or post-baseline QTcF values have 
passedtheselected ICH E14 Criteria, summary tables representing the numberand percentage of 
subjectswith ECG assessments satisfying theCPMP(Committee for Proprietary Medicinal 
Products)criteria will be provided separately for QTcFby treatment groupand visit (for baseline 
and post-baseline respectively). A subject with baseline or any post-baseline(including 
‘unscheduled’ visits)result meeting individual criteria will becounted. The selected CPMP criteria 
includes below:
QTcFInterval 
> 450 msec
> 480 msec
> 500 msec
QTcFInterval Increase from Baseline 
≥30 msec
Post-baseline QTcF Interval and Increase from Post-baseline Interval> 480 msec and 


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Baseline
Increase from Baseline >= 60 msec
Correspondinglisting will be provided for ECG data. 
11.7 Left Ventricular Ejection Fraction (LVEF)
The Left ventricular ejection fraction (LVEF)arecollected over time at selected visits. Itwill be 
measured by either echocardiography (ECHO)orMRI.Recorded values of LVEF and change 
from baseline values will be summarized by treatment group and by visit.
Correspondinglisting will be provided for LVEF. 
11.8 Antidrug Antibody Testing
The anti-drugantibody(ADA) binding to luspatercept(anti-ACE-536) will be testedover timein 
all subjects. The ADA level in samplesconfirmedpositiveto anti-ACE-536will be semi-
quantitated andreported as titer.Specificitytestsand neutralizing ADA tests will be conducted 
only for samples confirmed positive toanti-ACE-536.
To evaluate the treatment-emergent ADAlevel, the number and percentage of the subjects for each 
ADA test will be presented bytreatment group and ADA status.The ADA status of a subject 
during treatment is determinedbased on thelongitudinal anti-ACE-536resultsasfollowing:
Negative: All samples(baseline and post-baseline)are negative.
Positive to treatment-emergent ADA: 
- At least one post-baseline sample is positiveifthe baseline sample is negative, or
- At least one post-baseline sample is positive with a titer ≥ 4-fold of the baseline titer if 
the baseline sample is positive
Positive to preexisting ADA: 
-Baseline sample is positiveand all post-baseline samples are negative, or
-Both baseline and post-baseline samples are positive, but all positivepost-baseline 
sample have a titer <4-fold of the baseline titer.
A separatetable will summarize the number and percentage of the subjects and median (min, max) 
titer foranti-ACE-536by treatment group, visit, and ADA status.  In this table, only subjects tested 
positive to anti-ACE-536 will be included, and only positivesubjects in the luspatercept arm will 
be summarized by ADA status.Correspondinglisting will be provided to support the table.
Additionally, a bar plot will be provided for subject’s ADA status (“Preexisting”, “Treatment-
Emergent” and “Negative”). Percent of subjects within each category will be displayed by 
treatment group.


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11.9 Pregnancy Test and Menstrual Status for Female Subjects
The number and percentage of the subjects for each pregnancy test result category (i.e., positive, 
negative) will be presented by treatment group. A subject is counted as ‘positive’ if there is any 
positive result captured after first dose date, a subject is counted as ‘negative’ if there is no positive 
result captured after first dose date. 
The pregnancy test along with menstrual status will be provided in a listing.












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14 HEALTH RELATED QUALITY OF LIFE ANALYSIS
The HRQoL analysesareaddressedin corresponding subsection in Section10.4.This SAP only 
provides description of main HRQoL analysisspecify in the protocol. A detailed statistical 
analysis of HRQoL data will be provided in a separate HRQoLSAP, which will be finalized prior 
to database lock. The HRQoL SAP will beappended to separate specific HRQoLreport.


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15 GENERAL INFORMATION
15.1 Interim Analysis
There is no interim analysis planned for this study.
15.2 DMC
The independent DMC will be composed of expertsin the β-thalassemia not involved in ACE-536-
B-THAL-002protocol, an Independent Cardiologist, an Independent Statistician, and may include 
additional ad hoc members. Representatives of Sponsor will be attending the blinded part of the 
DMC meetings. The Sponsor will not have access to the unblinded data. 
During the course of the study, the DMC will review unblinded safety
 data regularly, or ad-hoc, as 
well as safety and efficacy data in accordance with the guidelines for the preplanned analyses.  
An independent third party will prepare the reports of aggregate data summaries and individual 
subject data listings, as appropriate, to the DMC members for each scheduled or ad-hoc meeting.
The DMC responsibilities, authorities, and procedures will be detailed in the DMC charter, which 
will be endorsed by the DMC prior to the first data review meeting. 
Operational details for the DMC and the algorithm will bedetailed in the DMC charter.


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16 IMPACT OF COVID-19 ON EFFICACY AND SAFETY ANALYSIS
The outbreak of a respiratory disease caused by a novel coronavirushas quicklybecomea global 
pandemic. The virus has been named “SARS-CoV-2” and the disease it causes has been named 
“Coronavirus Disease 2019” (COVID-19).  When the pandemic started, the study hasfinished
enrollment of all patients and is on the wayto collect the clinical data for the last 6 months.
The COVID-19 pandemicmay impact the conduct and statisticalanalysis of clinical trialsin 3 
different aspects(
 
1.Indirect (operational)impact–quarantine/travelrestrictions, site closure, interruption of 
supply chain to investigational product, overwhelmed healthcare systems, enrollment 
slow/pause.
2. Direct impact on trial participants-COVID-19 infection,treatmentfor COVID-19.
3. Impact that may affectendpoint interpretation-delayed/missed visits/assessments,
treatmentdelayed/interrupted/discontinued, study withdrawal, alternative ways of treatment
administration, alternative ways of data collection.
Any subjectswhohadany pandemic-related scenariosmentionedabovewillbe defined as the 
COVID-19-impacted populationin the pandemic period. Any subjects who had contracted 
COVID-19 will be grouped as the COVID-19-infectedpopulation.  Therefore, the COVID19-
infected population is a subgroupof the COVID19-impacted population.  Theidentification of the
COVID-19-impactedand COVID-19-infectedpatientswill be conducted on a weekly base and 
will be finalized prior to the database lock.
COVID-19information for the COVID-19-impacted populationwillbe captured intables of 
subjectdisposition, concomitant medication, healthcare resource utilization, summary of dose 
delay, and protocol deviation.All these 5 tables will have the COVID-19-related fields.  The 
subject dispositionand dose delaytablesprovidethe causeofdiscontinuation due to COVID-19.   
The protocol deviation tablehavesectionsspecifying whether thedeviations were caused by 
COVID-19. The table of concomitant medication capturesCOVID-19 medication if a subject is 
infected.  The healthcare resource utilization tableincludesthe reason for hospitalizationcaused 
by COVID-19.
16.1 Sensitivity Analysis of COVID-19 Impact on Efficacy Endpoints
The sensitivityanalyses maybe conducted for the primary and key secondary efficacy endpoints
of the non-COVID-19-impacted patientsby removing theCOVID-19-impacted populationto 
evaluatethe effects ofdose delays,missedcentral labmeasurements, missed assessments, COVID-
19 infection, or early discontinuationdue toCOVID-19.  


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16.2 Analysis and Reporting of COVID-19 Impact on Safety Endpoints
The summary analyses for safety endpointswillbe conducted on COVID-19-infected populations
for anyadverse eventsduring theentirepandemic period.  
Tablessummarizingthe incidence of TEAEs will be generated foreach of the followingby 
treatment group(if not otherwise specified, the summary is bySOC and PT)for COVID-19-
infected populations:
TEAEs;
Serious TEAE(SAE);
TEAE with CTCAE Grade ≥ 3; 
TEAEs leading tostudy drug discontinuation.








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18
APPENDICES
18.1 Handling of Dates
Dates will be stored as numeric variables in the SAS analysis files and reported in 
DDMMMYYYY format(ie, theDate9. datetime format in SAS).  Dates in the clinical database 
are classified into the categories of procedure dates, logdates, milestone dates, and specialdates.
Procedure Datesare the dates on which given protocol-specified procedure are 
performed.  They include thedates of laboratory testing, physical examinations, tumor 
scans, etc.  They should be present whenever data for a protocol-specified procedure 
are present and should only be missing when a procedure ismarked as NOT DONE in
the database.  Procedure dates will not be imputed.
Log Datesare dates recorded in eCRF data logs.  Specifically, they are the start and 
end dates for adverse events andconcomitant medications/procedures.  They should not 
be missing unless an event or medication is marked as ongoingin the database.  
Otherwise, incomplete log dates will be imputed according to the rules inAppendix 
18.2 (eg, for duration or cycle assignment, etc.). However, in listings, log dates will be 
shown as recordedwithout imputation.
Milestone Dates are dates of protocol milestonessuch as randomization, study drug 
start date,study drug terminationdate, study closure date, etc.  They should not be 
missing if the milestone occurs for a subject.  They will not be imputed.
SpecialDatescannot be classified in any of the above categories and they include the 
date of birth.  Theymay be subject to variable-specific censoring and imputation rules. 
Datesrecorded in comment fields will not be imputed or reported in anyspecific format. 
18.1.1Calculation Using Dates
Calculations using dates (eg, subject’s ageor relative day after thefirst dose of study drug)will 
adhere to the following conventions: 
Study days after the start day of study drug will be calculated as the difference between 
the date of interest and the first date of dosing ofstudy drug plus 1day. The generalized 
calculation algorithm for relative day is the following: 
o If TARGET DATE ≥DSTART then STUDY DAY = (TARGET DATE –
DSTART) + 1; 
o Else use STUDY DAY = TARGET DATE –DSTART.
Note that Study Day 1 is the first day of treatment of study drug. Negative study days 
are reflective of observations obtained during the baseline/screening period.  Note: 
Partial dates for the first study drug are not imputed in general. All effort should be 
made to avoid incomplete study drugstart dates. 


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Age (expressed in years) is calculated: the number of months between birth dateand 
informed consent datedivided by 12(if both dates are not missing), the integer partwill 
be kept. If the month ofbirth date is the same as informed consent dateand the day of 
birth date is greater than informed consent date, thenthe age calculated by above will 
minus 1. If any date is missing, AGE will be set to the age collected from CRF.
Partial birth date: impute missing day as 15thof the month; impute missing month 
as July;set missing age for missing year
Intervals that arepresented in weeks will be transformed from days to weeks by using 
(without truncation) the following conversion formula:
WEEKS = DAYS /7
Intervals that are presented in months will be transformed from days to months by 
using (without truncation) the following conversion formula:
MONTHS = DAYS /30.4167 
18.2 Date Imputation Guideline
18.2.1Impute Missing Dates of Adverse Events/ Prior or Concomitant Medications, 
Procedures/Surgeries
Incomplete Start Date:
Missing day and month
If the year is the sameas the year of the firstdosing date, then the day and month of the
first dosing date will be assigned to the missing fields.
If the year is prior tothe year of first dosing date, then December 31 will beassigned 
to the missing fields.
If the year is afterthe year of first dosing, then January 1 will be assigned to the 
missing fields.
Missing day only 
If the month and year are the sameas the year and month of first dosing date, then the 
first dosing date will be assigned to the missing day.
If either the year of the partial date is beforethe year of the first dosing date or the 
years of the partial date and the first dosing date are the same but the month of partial 
date is beforethe month of the firstdosing date, then the last day of the month will be 
assigned to the missingday.
If either the year of the partial date is afterthe year of the first dosing date or the years 
of the partial date and the first dose date are the same but the monthof partial date is 
afterthe month of the first dosing date, then the first day of the month will be assigned 
to themissing day.


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If the stop date is not missing, and the imputed start date is after the stop date, the start 
date will be imputed by the stop date. 
Missing day, month, and year
No imputation is needed, the corresponding AE will be included as TEAE. 
Incomplete Stop Date:If the imputed stop date is before the start date, then the imputed stop date 
will be equal to the start date.
Missing day and month
If the year ofthe incomplete stop date is the sameas the year of the lastdosing date, 
then the day and month of thelast dosing date will be assigned to the missing fields. 
If the year of the incomplete stop date is prior tothe year of the last dosing date or 
priorto the year of the first dosing date, then December 31 will be assigned to the 
missing fields.
If the year of the incomplete stop date is prior tothe year of the last dosing date but is 
the same as the year of the first dosing date, then the first dosing date will be assigned 
to the missing date. 
If the year of the incomplete stop date is afterthe year of the last dosing date, then 
January 1 will be assigned to the missing fields.
Missing day only 
If the month and year of the incompletestop date are the sameas the month and year of 
the last dosing date, then the day of the last dosing date will be assigned to the missing 
day. 
If either the year of the partial date is not equal tothe year of the last dosing date or the 
years of the partial date and the last dosing date are the same but the month ofpartial 
date is not equal tothe month of the last dosing date, then the last day of the month 
will be assigned to the missing day. 


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18.3 QoL Algorithm
18.3.1NTDT-PRO (Non-Transfusion-Dependent Thalassemia Patient-Reported Outcome)
The NTDT-PRO isa disease-specific QoL tool used to assess the severity ofsymptoms 
associated with NTDTβ-thalassemia. It is administered as a daily eDiary with recall of 
thalassemia-related symptoms during the past 24 hours.
Baseline and post-baseline score calculations are performedbased on weekly item scores. 
Baseline scores are calculated over7 days prior to Dose 1 Day 1.  TheNTDT-PROscoresare 
recorded daily from Dose 1 Day 1 through Week 24.  After Week 24, the NTDT-PRO scores 
are recorded byvisit.  The Week1weekly scores are calculated from Day 1 to Day 7.  The 
Week2weekly scoresare calculated from Day 8 to Day 14, similarly throughthe Week 24
weekly scores.  After Week 24, the weekly scores will be derivedover 7 daysbased onthe 
closestvisit day.
Step 1: Scoring the Items
All items have score ranges from0–10, with higher scores indicating more severe symptoms. 
If entries are missing for ≥4 days in any week, the average weekly item score is declaredas 
missing. Otherwise the mean ofthe non-missing item values is taken. 
If subjects do not have any validNTDT-PRO scores at baseline, Week 13-24 or Week 37-48 
due to the minimum4-day non-missing weekly score requirement, the 4-day non-missing rule 
will be relaxed to at least 2 daysto avoid missing data. The justification of this relaxed rule is 
supportedby the simulation results showing that no significant difference is found between 4-
day and 2-day non-missing weekly scores(Psychometric assessment of the NTDT-PRO using 
data from the phase 2 luspaterceptstudy, 2020).
Step 2: Calculating Scores for theT/W Domain
The average of non-missing weekly item scores from the first 4items (i.e., TiredNA, 
TiredPA, WeakNA, WeakPA) will be calculated if at least 1 non-missing weekly item score 
for tiredness [i.e. TiredNA, TiredPA] and at least 1 non-missing weeklyitemscore for 
weakness [i.e. WeakNA, WeakPA];otherwise, the weekly T/W score will be set tomissing. 
Thus, the rangeof weekly T/W score is 0–10.
Step 3: Calculating Scores forthe SoB Domain
The average of non-missing weekly item scores from the last2 items (i.e., SobNA and 
SobPA) will be calculated if ≥50% of the items (≥1 items) are not missing; otherwise, the 
weeklySoB score will be set to missing. Thus, the range of weekly SoB scoreis 0–10.


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NTDT-PRO© (version 2) Instrument
For each of the following questions, please choose the number that best describes the 
symptoms that you may have experienced during the past24 hours.
1. How would you rate your tiredness (lack of energy) whenyou were notdoing 
physical activity during the past 24 hours?
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10
No
tiredness
Extreme
tiredness
2. How would you rate your tiredness (lack of energy) when you were doing 
physical activity during the past 24 hours?
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10
No
tiredness
Extreme
tiredness
3. How would you rate your weakness (lack of strength) when you werenotdoing 
physical activity during the past 24 hours?
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10
No
weakness
Extreme
weakness
4. How would you rate your weakness (lack ofstrength) when you were doing 
physical activity during the past 24 hours?
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10
No
weakness
Extreme
weakness


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5. How would you rateyour shortness of breath whenyou werenotdoing physical
activity during the past 24 hours?
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10
No
shortness 
ofbreath
Extreme
shortness 
of breath
6. How wouldyou rate your shortness of breath whenyou were doing physical 
activity during the past 24 hours?
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10
No
shortness
of breath
Extreme
shortness
ofbreath
For validation purposes only
7. During the past 24 hours, how would you rate the overall severity of your thalassemia 
symptoms? 
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10
No
symptoms
Very 
severe
symptoms
For validation purposes only (administered onceevery 3 weeks):
8. How would you rate the overall change in your thalassemia symptoms since the start of 
this study?
□  A great deal better
□  Much better
□  A little better
□  No change
□  A little worse
□  Much worse
□  A great deal worse


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18.3.2FACIT-F
FACIT-F evaluation include FACT-G scale and FACIT Fatigue Subscale (FS). FACT-G scale are 
based on 4 domains: Physical Well-Being (PWB), Social/Family Well-Being (SWB), Emotional 
Well-Being (EWB), and Functional Well-Being (FWB). In ERT system, the questions of Fatigue 
scale were in the section of Additional Concern. The version 4 of FACIT-F was applied in the 
study.
Domain
Questions
PWB
1, 2, 3, 4, 5, 6, 7
SWB
8, 9, 10, 11, 12, 13, 14
EWB
15, 16, 17,18, 19, 20
FWB
21, 22, 23, 24, 25, 26, 27
FS
28, 29, 30, 31, 32, 33, 34, 
35, 36, 37, 38, 39, 40
The 5 domain scores and the total score are obtained by the following steps:
Step 1: Score the Individual Question
All questions havescore range 0-4 as collectedand higher score indicates betterQoL. So some of 
item response, ie raw collection need be reversed by subtracting 4 to obtainthe item score. The 
score will be reversed from responsefor following questions:
Domain
Questions
PWB
1, 2, 3, 4, 5, 6, 7
EWB
15, 17, 18, 19, 20
FS
28, 29, 30, 31, 32, 33, 36, 
37, 38, 39, 40
For the other questions, the response is the question score.
Step 2: Calculating Domain Score
If morethan80%of the total questionsin the domain are answered, the domain score will be 
calculated as
domain
in 
items
of
Number 
domain
in the
answered
items
of
Number 
domain
in the
score
item
of
Sum

Otherwise, it will be left as missing. 
Step 3: Calculating TotalScore
If all domain scoresare derived, the total score is the sumof all domain scores
Otherwise, it will be left as missing.


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18.3.3SF-36
The SF-36 is a self-administered instrument consisting of 8 multi-item scalesthat assess 8 health 
domains: (1) Physical functioning(PF), 10 itemsfrom 3a to 3j, (2) Role-Physical(RP), 4 items 
from4a to4d, (3) Bodily Pain(BP), items 7 and 8, (4) General Health(GH), items 1 and 11a to 
11d, (5) Vitality(VT), items 9a, 9e, 9g, and 9i, (6) Social functioning(SF), items 6 and 10, (7) 
Role-Emotional(RE), items 5a, 5b, and 5c, (8) MentalHealth(MH), 5 items 9b, 9c, 9d, 9f and 9h. 
Two summary scales, Physical Component Summary (PCS) and Mental Component Summary 
(MCS), will be calculated using norm-based scores from the 8 health domains. The primary 
interests of the SF-36 are the 8 health domainscores and the PCS and MCS scores.
The 8 health domain scores and the PCS and MCS scores are obtained by the following steps.
Step 1: Score the 8 Health Domain 
All questions will be scored as per the raw datavalue collected with the following exceptions. 
Seven questions (6, 9a, 9d, 9e, 9h, 11b, and 11d) will use the reversed score, so that 5=1, 4=2, 3=3, 
2=4 and 1=5. Thehigherindividualscore indicates thebetter health.
The SF-36 scoring system relies on an assumption of linearity among the responses.However, 
question 1, 7 and 8 require recalibration to satisfy this important scaling assumption.
Question 1 
Q1
(verbatim responses)
Q1
(raw value)
Q1
(final response value)
Excellent
1
5.0
Very good
2
4.4
Good
3
3.4
Fair
4
2.0
Poor
5
1.0
Question 7
Q7
(verbatim responses)
Q7
(raw value)
Q7
(final response value)
None
1
6.0
Very mild
2
5.4
Mild
3
4.2
Moderate
4
3.1
Severe
5
2.2
Very severe 
6
1.0
Question 8 will have its score inversed too, but also depends on the response given for question 7, 
in the following manner:
Q7
Q8
Q8
Q8


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(raw value)
(verbatim responses)
(raw value)
(final response value)
1
Not at all
1
6
2, 3, 4, 5 or 6
Not at all
1
5
any
A little bit
2
4
any
Moderately
3
3
any
Quite a bit
4
2
any
Extremely
5
1
If question 7isnot answered then question 8 will have its score recoded to preserve linearity, in 
the following manner:
Q7
(raw value)
Q8
(verbatim 
responses)
Q8
(raw value)
Q8
(final response value)
missing
Not at all
1
6.0
missing
A little bit 
2
4.75
missing
Moderately
3
3.5
missing
Quite a bit 
4
2.25
missing
Extremely
5
1.0
Missing data will be handled per the SF-36 version 2 scoring guideline. If more thanhalf of the 
items are answered in a multi-item domain, then the missing item(s) will be imputed as the average 
score of the completed items in the same domain. If no more than half of the items are answered, 
the missing item will be left as missing
Step 2: Calculating Domain Score and Transforming Domain Score to 0-100 Scale Score
The total raw score foreachheath domainscale will be computed. The total raw score is the 
simple algebraic sum of the final response values for all items in a given scale. Theresulting total 
raw score for each health domain is then transformed to a 0-100 scale score:
Health Domain Sum of final response values
Transformed 0-100 Scale Score
PF
Sum_PF=3a+3b+3c+3d+3e+3f
+3g+3h+3i+3j
T_PF = ((Sum_PF-10)/40)*100
RP
Sum_RP=4a+4b+4c+4d
T_RP = ((Sum_RP -4)/16)*100
BP
Sum_BP=7+8
T_BP = ((Sum_BP -2)/10)*100
GH
Sum_GH=1+11a+11b+11c+11d T_GH = ((Sum_GH -5)/20)*100
VT
Sum_VT=9a+9e+9g+9i
T_VT = ((Sum_VT -4)/16)*100
SF
Sum_SF=6+10
T_SF = ((Sum_SF -2)/8)*100
RE
Sum_RE=5a+5b+5c
T_RE = ((Sum_RE -3)/12)*100
MH
Sum_MH=9b+9c+9d+9f+9h
T_MH = ((Sum_MH -5)/20)*100
Step 3: Computing Norm-based Domain Scores


EDMS Doc. Number: 25163165 - 25009896
Luspatercept(ACE-536)
Statistical Analysis Plan. Protocol ACE-536-B-THAL-002
Celgene Corporation
Confidential and Proprietary
82
ACE-536-B-THAL-002Final Version1.0    5Nov2020
       
          
In order for one health domain scale be meaningfully compared with those from the other scales 
and that domain scores have a direct interpretation in relation to the distribution of scores in U.S. 
general population, the 0-100 scale scorefor each health domain will be converted to norm-based 
scores using a T-score transformationand higher norm-based score indicates better heath:
Health 
Domain
Transformation of 0-100 scores to 
z-scores
Transformation of z-scores to 
norm-based scores
PF
Z_PF = (T_PF -
83.29094)/23.75883
N_PF = 50 + (Z_PF*10)
RP
Z_RP = (T_RP -
82.50964)/25.52028
N_RP = 50 + (Z_RP*10)
BP
Z_BP = (T_BP -
71.32527)/23.66224
N_BP = 50 + (Z_BP*10)
GH
Z_GH = (T_CH -
70.84570)/20.97821
N_GH = 50 + (Z_GH*10)
VT
Z_VT = (T_VT-
58.31411)/20.01923
N_VT = 50 + (Z_VT*10)
SF
Z_SF = (T_SF -
84.30250)/22.91921
N_SF = 50 + (Z_SF*10)
RE
Z_RE = (T_RE -
87.39733)/21.43778
N_RE = 50 + (Z_RE*10)
MH
Z_MH=(T_MH -
74.98685)/17.75604
N_MH = 50 + (Z_MH*10)
Step 4: Computing the Aggregated Physical and Mental Component Scores
Using the standardized domain scores (z-scores), aggregated PCS and MCS score will be 
computed based on the weights from the U.S. general population:
Aggregate PCSscore = (Z_PF *0.42402)+ (Z_RP * 0.35119)+ (Z_BP * 0.31754)+ 
(Z_GH * 0.24954)+ (Z_VT * 0.02877)+(Z_SF *-.00753)+(Z_RE *-.19206)+(
Z_MH*-0.22069)
Aggregate MCSscore=(Z_PF * -0.22999)+ (Z_RP * -0.12329)+ (Z_BP * -0.09731)
+ (Z_GH * -0.01571)+ (Z_VT * 0.23534)+(Z_SF *0.26876)+(Z_RE*-.43407)+
(Z_MH*0.48581)
Step 5: Calculating the Norm-based PCS and MCS scores:
AggregatePCS and MCS scores are standardized using a linear T-score transformation with a 
mean of 50 and a standard deviation of 10and highercomponentscore indicatesbetter heath:
Norm-based PCS  = 50 + (Aggregate PC score * 10)
Norm-based MCS = 50 + (AggregateMC score * 10)