A Phase 3, Open-label, Randomized, Multi-center, Controlled Trial to Evaluate the Pharmacokinetics and Pharmacodynamics of Edoxaban and to Compare the Efficacy and Safety of Edoxaban With Standard of Care Anticoagulant Therapy in Pediatric Subjects From Birth to Less Than 18 Years of Age With Confirmed Venous Thromboembolism (VTE)
Phase: PHASE3
Conditions: Venous Thromboembolism (VTE), Pulmonary Embolism, Deep Vein Thrombosis (DVT)
Sponsor: Daiichi Sankyo

Proprietary and Confidential 
Page 1 
CLINICAL STUDY PROTOCOL 
 
A PHASE 3, OPEN-LABEL, RANDOMIZED, MULTI-
CENTER, CONTROLLED TRIAL TO EVALUATE THE 
PHARMACOKINETICS AND PHARMACODYNAMICS 
OF EDOXABAN AND TO COMPARE THE EFFICACY 
AND SAFETY OF EDOXABAN WITH STANDARD OF 
CARE ANTICOAGULANT THERAPY IN PEDIATRIC 
SUBJECTS FROM BIRTH TO LESS THAN 18 YEARS OF 
AGE WITH CONFIRMED VENOUS 
THROMBOEMBOLISM (VTE) 
 
DU176b-D-U312 
IND NUMBER 63,266 
EUDRACT NUMBER 2016‐000991‐49 
VERSION 4.0, 08 JUN 2021 
VERSION 3.0, 07 JUN 2019 
VERSION 2.0, 19 JAN 2018 
VERSION 1.0, 21 APR 2016 
 
SPONSOR: 
Daiichi Sankyo, Inc. 
211 Mount Airy Road  
Basking Ridge, NJ 07920, USA 
 
CONFIDENTIALITY STATEMENT 
Information contained in this document is proprietary to Daiichi Sankyo, Inc.  The information is 
provided to you in confidence which is requested under an agreed upon and signed 
Confidentiality and Disclosure Agreement.  Do not give this document or any copy of it or reveal 
any proprietary information contained in it to any third party (other than those in your 
organization who are assisting you in this work and are bound by the Confidentiality and 
Disclosure Agreement) without the prior written permission of an authorized representative of 
Daiichi Sankyo, Inc. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 3 
GLOBAL AMENDMENT, PROTOCOL VERSION 4.0 
HIGH-LEVEL DESCRIPTION OF EACH CHANGE: RATIONALE AND LOCATION  
Changes to the Protocol: 
Please refer to the comparison document (tracked changes) of protocol Version 3.0 (dated 
07 Jun 2019) versus protocol Version 4.0 (dated 08 Jun 2021) for actual in-text changes.  The 
summary of changes below is a high-level summary of major changes in the clinical study 
protocol (Version 4.0) by section. 
Table of High Level Changes to Protocol from Version 3.0 to Version 4.0 
1 
In Cohort 5, subjects ≤28 days old are to be given a reduced dose of edoxaban 
at  0.4 mg/kg. 
The following sections of the protocol were updated: 
 
Table 5.1 Edoxaban Dose Recommended for All 5 Cohorts (12 to <18 years, 6 to 
<12 years, 2 to <6 years, 6 months to <2 years, and birth to <6 months)   
2 
In Cohort 5, subjects may receive anticoagulation treatment for an intended duration of 
at least 6 to 12 weeks. 
The following sections of the protocol were updated: 
 
Protocol Synopsis 
 
Section 2.1.1 Primary Objective 
 
Section 2.1.2 Secondary Objectives 
 
Section 3.2 Discussion of Study Design 
 
Section 3.3 End of Study 
 
Section 5.6.6 Follow-up Procedures 
 
Section 6.3 Main Treatment Period 
 
Section 6.3.1 Subjects randomized to the edoxaban treatment arm  
 
Section 6.3.3 Monthly Visits (Months 1 and 2; Visits 3 and 4) for both arms 
 
Section 6.3.4 End of Main Treatment Period Visit (Month 3 or at least 6 to 12 
Weeks for Cohort 5, Visit 5) Procedures 
 
Section 7.1 Primary Efficacy Endpoint(s) 
 
Section 7.2 Secondary Efficacy Endpoint(s) 
 
Section 9.2 Safety Endpoint Event(s) 
 
Table 17.1: Schedule of Events 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 4 
3 
For Cohort 5, the sample size on Day 5 will be between 5 and 12 for subjects on 
edoxaban treatment. 
The following sections of the protocol were updated: 
 
Protocol Synopsis 
 
Section 3.2 Discussion of Study Design 
 
Section 4.3.1 Stopping Rules for Age-based cohort during PK/PD assessment 
 
Section 6.3.1 Subjects randomized to the edoxaban treatment arm 
 
Section 8 Pharmacokinetic/Pharmacodynamic Assessments 
 
Table 17.1: Schedule of Events 
4 
In Cohort 5, renal function monitoring will be done on or around Day 5 (at the same 
time of PK sampling). 
The following sections of the protocol were updated: 
 
Section 6.3.1.1 Study Day 5 (+3 days) for Subjects Randomized to Edoxaban 
Only (Visit 2a) 
 
Section 8 Pharmacokinetic/Pharmacodynamic Assessments 
 
Table 17.1 Schedule of Events 
5 
In Cohort 5, site staff will contact the parents by phone on approximately Day 2, Day 7, 
and every week thereafter until Month 1 (Visit 3) post discharge to inquire about AEs, 
SAEs, and bleeding events.  
The following section of the protocol was updated: 
 
Section 9.1 Adverse Event Collection and Reporting 
6 
For subjects in Cohort 5, a radiologic VTE image will be taken at the end of the intended 
treatment period (at least 6-12 weeks) or at the discontinuation visit if anticoagulant 
treatment is received for <3 months. 
The following sections of the protocol were updated: 
 
Protocol Synopsis 
 
Section 4.1 Inclusion Criteria 
 
Section 6.3.1 Subjects randomized to the edoxaban treatment arm 
 
Section 6.3.3 Monthly Visits (Months 1 and 2; Visits 3 and 4) for both arms 
 
Section 7.1 Primary Efficacy Endpoint(s) 
 
Table 17.1: Schedule of Events 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 5 
PROTOCOL SYNOPSIS 
EudraCT: 
2016‐000991‐49 
IND Number: 
IND 63,266 
Protocol Number: 
DU176b-D-U312 
Investigational Product: 
Edoxaban (DU-176b) 
Active Ingredient(s)/INN: 
Edoxaban tosylate:  N-(5-Chloropyridin-2-yl)-N’-[(1S,2R,4S)-4-
(N,N-dimethylcarbamoyl)-2-(5-methyl-4,5,6,7-
tetrahydro[1,3]thiazolo[5,4-c]pyridine-2-
carboxamido)cyclohexyl] oxamide mono(4-
methylbenzenesulfonate) monohydrate 
Study Title: 
A Phase 3, open-label, randomized, multi-center, controlled trial 
to evaluate the pharmacokinetics and pharmacodynamics of 
edoxaban and to compare the efficacy and safety of edoxaban 
with standard of care anticoagulant therapy in pediatric subjects 
from birth to less than 18 years of age with confirmed venous 
thromboembolism (VTE) 
Study Phase: 
Phase 3 
Study Acronym: 
The Edoxaban Hokusai VTE PEDIATRICS Study 
Indication Under Investigation: Treatment and secondary prevention of VTE 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 6 
Study Objectives: 
Primary Objective: 
The primary objective is to demonstrate the non-inferiority of 
edoxaban to standard of care (SOC; including low molecular 
weight heparin (LMWH), vitamin K antagonist (VKA), or 
synthetic pentasaccharide (SP) Xa inhibitors) in the treatment 
and secondary prevention of VTE in pediatric subjects with 
regard to the composite efficacy endpoint (ie, symptomatic 
recurrent VTE, death as result of VTE, and no change or 
extension of thrombotic burden) during the first 3-month 
treatment period (for Cohort 5, the intended duration of 
treatment is 6-12 weeks). 
Secondary Objectives: 
 To compare edoxaban against SOC with regard to the 
combination of major and clinically relevant non-
major (CRNM) bleedings occurring during treatment 
or within 3 days of completing or interrupting or 
stopping study treatment during the first 3-month 
treatment period (for Cohort 5, the intended duration 
of treatment is 6-12 weeks). 
 To compare edoxaban against SOC with regard to a 
combination of major and CRNM bleedings and 
symptomatic recurrent VTE, and death as result of 
VTE which occur from first to the last dose + 30 
days. 
 To compare edoxaban against SOC with regard to all 
bleedings which occur from first to the last dose + 30 
days. 
 To compare edoxaban against SOC with regard to the 
composite efficacy endpoint as described in the 
primary objective from randomization to the last 
dose + 30 days. 
 To compare edoxaban against SOC with regard to 
all-cause mortality from randomization to the last 
dose + 30 days. 
 To compare edoxaban against SOC with regard to the 
individual components of the composite efficacy 
endpoints as described in the primary objective 
during the first 3-month treatment period (for 
Cohort 5, the intended duration of treatment is at 
least 6 to 12 weeks). 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 7 
 To compare edoxaban against SOC with regard to 
occurrence of DVT, catheter-related thrombosis, PE, 
sinovenous thrombosis within and after the first 3-
month treatment period (for Cohort 5, the intended 
duration of treatment is at least 6-12 weeks). 
 To compare edoxaban against SOC with regard to a 
composite combination of major and CRNM 
bleedings from first to the last dose + 30 days. 
 To characterize the multiple dose pharmacokinetics 
of edoxaban in pediatric subjects at Day 5 using 
population pharmacokinetic (PK) analysis (apparent 
systemic clearance [CL/F] and apparent volume of 
distribution [V/F]) and to assess the effect of 
covariates such as age, body weight, and renal 
function on the PK of edoxaban. 
 To evaluate the relationship between edoxaban 
exposure and safety (such as bleeding) and efficacy 
(thromboembolic events). 
 To characterize the effect of edoxaban on biomarkers 
of coagulation (ie, prothrombin time [PT], activated 
partial thromboplastin time [aPTT], and anti-
activated factor X [anti-FXa]). 
Study Design: 
This is an event driven Phase 3, prospective, randomized, open-
label, blinded endpoint evaluation (PROBE) parallel group study 
in subjects with confirmed VTE.  This study is designed to 
evaluate the PK and pharmacodynamics (PD) of edoxaban and 
to compare the efficacy and safety of edoxaban after at least 5 
days of heparin (LMWH or SP Xa inhibitors or unfractionated 
heparin (UFH); with overlapping VKAs if needed) against SOC 
(LMWH, VKA, or SP Xa inhibitors) in pediatric subjects with 
confirmed VTE.  
The adjudication of the efficacy and safety endpoints will be 
conducted by a blinded adjudication committee. 
The study includes two periods:  
 The Main Treatment Period is defined as the time 
from randomization, until the end of Month 3 of 
treatment. The Main Treatment Period for subjects 
less than 6 months (Cohort 5) old is defined as the 
time from randomization until the end of 
anticoagulant therapy for at least 6 to12 weeks  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 8 
 Subjects who early discontinue the Main 
Treatment Period will be monthly followed 
according to the Schedule of Events (Table 17.1) 
through Month 3 visit (Visit 5) and 30 day 
Follow-Up Visit (Visit 9).   
 Subjects who complete the Main Treatment 
Period but do not continue into the Extension 
Period will be followed for 30 days after last dose 
of study drug (Visit 9). 
 If a subject discontinues study medication before 
Month 2, the follow up visit may be combined 
with the Month 3 Visit. 
 The Extension Period is discretionary for the 
Investigator and will include treatment from the end 
of the Main Treatment Period (Month 3, Visit 5) up 
through the end of Month 12 (Visit 8).  
 Subjects who discontinue the treatment at any 
time after Month 3 will have a 
Month 12/Discontinuation Visit (Visit 8) 
performed with the subsequent 30-day follow-up 
(Visit 9). 
 Subjects who complete Extension Period 
treatment at Month 12 (Visit 8) will be followed 
for 30 days after last dose of study drug (Visit 9).  
 Subjects who require anticoagulant treatment after 
discontinuation of the study treatment at any time 
will be transitioned to a therapy as determined by the 
Investigator. 
The study will attempt to recruit at least 10% of the subjects 
diagnosed with pulmonary embolism. 
About 274 subjects will be included in this randomized study 
(137 subjects in each treatment arm) which will be conducted at 
clinical sites located worldwide. 
Randomization will be stratified by age cohorts and by region 
(US/Canada, Europe, Asia/Pacific, and Rest of the World).  
After subjects are assessed for eligibility based on a newly 
diagnosed index VTE by imaging and per the 
inclusion/exclusion criteria, and have undergone bridging 
treatment of at least 5 days of heparin (LMWH or SP Xa 
inhibitors or UFH; with overlapping VKAs if needed) prior to 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 9 
randomization, the subjects will be randomized in a 1:1 ratio 
into one of the two study arms:  
 Edoxaban treatment arm: subjects will receive 
selected dose of Edoxaban 
or  
 SOC treatment arm: subjects will receive SOC 
anticoagulant according to study site’s SOC 
treatment, as follows (alone or combination): 
 LMWH (alone or followed with VKA) 
 SP Xa inhibitors (alone or followed with VKA) 
 Vitamin K antagonist (VKA) 
In the case of centrally sourced SOC treatment, Sponsor 
will only provide enoxaparin as LMWH, fondaparinux as 
SP Xa inhibitor, or warfarin as VKA. 
The subjects will be recruited into 5 age cohorts: 
 Ages 12 to <18 years   
 Ages 6 to <12 years   
 Ages 2 to <6 years   
 Ages 6 months to <2 years   
 Ages birth to <6 months  
Sequential enrollment of age cohorts will be used for 
randomization.  The order of enrollment will be from the oldest 
age cohort to te youngest age cohort.  The first age cohort to be 
randomized will be from ages 12 to <18 years.  Doses for all 
subsequent age cohorts will be made by separate notifications to 
the investigative sites, outside the content of this protocol, and 
after the Independent Data Monitoring Committee (IDMC) has 
approved the proposed edoxaban doses.  
Subjects in edoxaban treatment arm (137 subjects): 
Starting doses for each age cohort in the U312 study will be 
selected based on edoxaban exposure for age matched subjects 
and safety data from a supporting Phase 1 Study DU176b-A-
U157 study (Single-dose PK/PD study in pediatric subjects at 
risk of VTE), and on population-based PK.   
Edoxaban treatment will be dispensed to the subject on a 
monthly visit schedule.  After Month 3, on a case-by-case basis, 
confirmed by the Sponsor, a 3-month dispense may occur to 
facilitate subject travel arrangements.  The oldest cohort (12 to 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 10 
<18 years of age) will receive tablets.  All younger age cohorts 
(<12 years) will receive edoxaban granules for oral suspension 
and will be dosed on an mg/kg basis (see Section 5.1.1.1). 
The enrollment into the first age cohort (12 to <18 years) of 
U312 study will begin when the edoxaban dose for this age 
cohort is selected from the supporting Phase 1 Study U157 (see 
Section 5.1.1.1).  Approximately the first 12 subjects of each age 
cohort (total of 53 to 60 subjects) randomized to the edoxaban 
treatment arm (subject number is determined by evaluable blood 
specimens demonstrating edoxaban exposure) will participate in 
the multiple-dose PK/PD assessment on Day 5 (+3 days, Visit 
2a) as follows:  
 Ages 12 to <18 years (N≈12) 
 Ages 6 to <12 years (N≈12) 
 Ages 2 to <6 years (N≈12) 
 Ages 6 months to <2 years (N≈12) 
 Ages birth to <6 months (N≈5-12) 
Two blood samples will be collected on the day of the fifth dose 
of edoxaban (Day 5+3 days, Visit 2a) for all age cohorts, 
participating in the edoxaban PK/PD analysis, including: 
 PK Pre-dose sample for all participating subjects.   
 PK Post-dose sample can be taken at either: 
 any time between 1.0 to 3 hours post-dose 
or 
 any time between 5 to 8 hours post-dose 
 The PD sampling times on Day 5 for measurement of 
PT, aPTT and anti-FXa, will be taken at the same 
time as the PK samples.  
 A PK analysis will be performed.  If the analysis of 
the subjects confirms the edoxaban exposure 
predictions and based on emerging safety, the 
expanded enrollment in the same age cohort will be 
allowed to start.  A notification will be sent to all 
Investigators that expansion of the age cohort is 
permitted after the PK analysis.  In addition, a 
notification to the Investigator will indicate that Day 
5 PK/PD edoxaban exposure evaluation will no 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 11 
longer be necessary for future subjects randomized to 
edoxaban in the corresponding age cohort. 
Enrollment in the next younger age cohorts in U312 study will 
begin upon the availability of: 
 PK analysis performed on participating subjects in 
the prior older age cohort in U312. 
 Safety data analysis on the subjects in the prior older 
age cohort in U312. 
 PK analysis of the subjects in the next younger age 
cohort in U157. 
 Safety data analysis on the subjects of the next 
younger age cohort in U157. 
PK and safety data will be reviewed by an Independent Data 
Monitoring Committee (IDMC; Section 15.9) who will approve 
the start of the next younger age cohort.   
In each age cohort if the estimated median AUC based on the 
observed PK data in a subset of subjects on Day 5 PK 
assessment is less than 1.5-fold the median AUC from the 
simulated subject population profiles (over-exposure and under-
exposure), the enrollment of subjects in the corresponding age 
cohort will continue and enrollment in the next younger age 
cohort can begin.   
Study Duration: 
The total duration of the study is expected to be approximately 
4.5 years. 
The total duration of study participation for any individual 
subject will be a minimum of 4 months (3-month Main 
Treatment Period and 30 days Follow-up) and maximum of 13 
months (3-month Main Treatment Period, 9-month Extension 
Period and 30 days Follow-up). 
-For subjects <6 months old (Cohort 5) with the presence of 
documented VTE confirmed by appropriate diagnostic 
imaging and requiring anticoagulant therapy, the intended 
duration of treatment is for at least 6 to 12 weeks. 
Study Centers and Location: This study will be conducted in US/Canada, Europe, 
Asia/Pacific, and Rest of the World. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 12 
Subject Eligibility Criteria: 
Inclusion Criteria: 
Subjects must satisfy all of the following criteria to be 
included in the study: 
1. Male or female pediatric subjects between birth (defined 
as 38 weeks gestational age) and less than 18 years of 
age at the time of consent. 
2. Pediatric subjects with the presence of documented VTE 
confirmed by appropriate diagnostic imaging and 
requiring anticoagulant therapy for at least 90 days (list 
of VTE provided in Section 7.1). 
-Subjects <6 months old (Cohort 5) with the 
presence of documented VTE confirmed by 
appropriate diagnostic imaging and requiring 
anticoagulant therapy for at least 6 to12 weeks 
3. Subjects must have received at least 5 days of heparin 
(LMWH or SP Xa inhibitors or UFH according to the 
edoxaban label for VTE treatment) therapy prior to 
randomization to treat the newly identified index VTE.  
In addition, prior to being randomized to edoxaban or 
SOC, subjects initially treated with VKA are 
recommended to have an INR ≤2.5.   
4. Subject and/or parent(s)/legal guardian(s) or legally 
acceptable representative is informed and provides 
signed consent for the child to participate in the study 
with edoxaban treatment.  Pediatric subjects with 
appropriate intellectual maturity will be required to sign 
an assent form in addition to the signed informed 
consent from the parent(s)/legal guardian(s) or any 
legally acceptable representative. 
5. Female subjects who have menarche must test negative 
for pregnancy at Screening and must consent to avoid 
becoming pregnant by using an approved contraception 
method throughout the study (Appendix 17.3). 
Exclusion Criteria: 
Subjects who meet any of the following criteria will be 
disqualified from entering the study: 
1. Subjects with active bleeding or high risk of bleeding 
contraindicating treatment with LMWH, SP Xa 
inhibitors, VKAs, or direct oral anticoagulants (DOACs; 
identified high risk of bleeding during prior experimental 
administration of DOACs). 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 13 
2. Subjects who have been or are being treated with 
thrombolytic agents, thrombectomy or insertion of a 
caval filter for the newly identified index VTE. 
3. Administration of antiplatelet therapy is contraindicated 
in both arms except for low dose aspirin defined as 1-5 
mg/kg/day with maximum of 100 mg/day (see 
Appendix 17.4.1). 
4. Administration of rifampin is prohibited during the study 
and subjects on concomitant use of rifampin are 
excluded. 
5. a) Subjects with severe hepatic impairment or hepatic 
disease associated with coagulopathy (eg, acute hepatitis, 
chronic active hepatitis, and cirrhosis).   
b) Subjects with ALT >5 × the upper limit of normal 
(ULN) or total bilirubin >2 × ULN with direct bilirubin 
>20% of the total at Screening.  
c) Subjects with aPTT >50 seconds or international 
normalized ratio [INR] >2.0 not related to 
anticoagulation therapy). 
6. Subjects with estimated glomerular filtration rate (eGFR) 
<30% of normal for age and size (see Appendix 17.7).  
7. Subjects with stage 2 hypertension defined as blood 
pressure (BP) systolic and/or diastolic confirmed >99th 
percentile + 5 mmHg (see Appendix 17.8). 
8. Subject with thrombocytopenia <50 × 109/L at Screening 
Visit.  Subjects with a history of heparin-induced 
thrombocytopenia may be enrolled in the study at the 
Investigator’s discretion. 
9. Life expectancy less than the expected study treatment 
duration (3 months). 
10. Subjects who are known to be pregnant or breastfeeding. 
11. Subjects with any condition that, as judged by the 
Investigator, would place the subject at increased risk of 
harm if he/she participated in the study including 
contraindicated medications identified in Appendix 17.4. 
12. Subjects who participated in another interventional 
clinical study or were treated with an experimental 
therapy with less than a 30-day wash-out period prior to 
identifying the qualifying index VTE. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 14 
13. Hypersensitivity to the active ingredient or to any of the 
excipients of any components of the trial treatment. 
14. Patients with a history of thrombosis who are diagnosed 
with antiphospholipid syndrome who are triple positive 
(for lupus anticoagulant, anticardiolipin antibodies, and 
anti-beta 2-glycoprotein I antibodies). 
Additional Requirements: 
Stopping Rules for Age-based cohort during PK/PD 
assessment:  
 In each age cohort, if the estimated edoxaban median 
AUC based on the observed PK data in the 
approximately 12 subjects (5-12 subjects in Cohort 
5) on Day 5 PK assessment is 50% higher or 50% 
lower than the median AUC from the simulated 
subject population profiles, dose reevaluations for 
Phase 3 subjects will be recommended to achieve the 
exposure comparable to adult 60 mg doses.  The 
enrollment of subjects in the corresponding age 
cohort will be put on hold until reevaluation of the 
dose for this age cohort.   
Stopping Rules for Study: 
An IDMC may recommend termination of the study.  
Termination may be made for any of the following reasons: 
 Concern about significantly higher bleeding risk 
relative to one of the study arms, 
 Concern about drug-induced liver injury, 
 Any other safety concern based on benefit/risk 
evaluation.   
Dosage Form, Dose and Route 
of Administration: 
Pre-Randomization Treatment (Screening) 
Pre-randomization treatment will be provided by the 
Investigator or diagnosing clinic of the index VTE.  Initial 
treatment using LMWH or SP Xa inhibitor or UFH for index 
VTE prior to randomization must be within the range of 5 to 15 
days and up to 20 days with Sponsor approval.  If VKA are 
administrated prior randomization, INR prior to randomization 
is recommended to be ≤2.5. 
After pre-randomization, study treatment should be 
administered on the same day of randomization (Day 1).  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 15 
Subject will be randomized (Day 1) in a 1:1 ratio into one of the 
two study arms. 
Randomization to Edoxaban Treatment Arm  
Randomization will occur after at least 5 days of 
LMWH/UFH/SP Xa inhibitors (with overlapping VKA if 
needed), post diagnosis of VTE. 
Edoxaban treatment will be dispensed to the subject on a 
monthly visit schedule.  After Month 3, on a case-by-case 
basis, confirmed by the Sponsor, a 3-month dispense may occur 
to facilitate subject travel arrangements. 
Randomization Day will be edoxaban Day 1. If the subject was 
on a VKA and randomized with INR ≥2.5, edoxaban treatment 
may be delayed until the INR is ≤2.5. The Day 5 PK/PD 
assessment will be adjusted to accommodate the delay in 
edoxaban dosing.  For subjects participating in PK/PD 
assessment and receiving LMWH twice a day and who already 
received a morning dose on Day 1 prior to randomization, 
edoxaban can be started on the morning of Day 2 (12 hours ± 3 
hours after last evening dose of LMWH).  
Edoxaban will be started orally at the age/weight/renal function 
appropriate dose (see Section 5.1.1.1.1) for the Treatment Period 
(see Section 5.2.4.1).  The following dosage forms will be 
provided for this study: 
 Edoxaban 15 mg and 30 mg tablets for 12 to <18 
years old subjects; 
 60 mg dose will be dispensed with two 30 mg 
tablets 
 45 mg dose will be dispensed with one 30 mg 
tablet plus one 15 mg tablet 
 30 mg dose will be dispensed with one 30 mg 
tablet 
 If a subject does not have the capacity to swallow 
tablets in the 12 to <18 year old group, the tablets 
may be crushed and served with applesauce or mixed 
with 2 to 3 ounces of water and immediately 
administered by mouth or through a gastric tube. 
 Edoxaban granules for oral suspension 60 mg.  It will 
be reconstituted in 8 mL water to provide a 6 mg/mL 
liquid suspension for subjects younger than 12 years 
old.  Doses provided by the granulation formulation 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 16 
will be dispensed with an oral dosing syringe 
according to the recommended doses for the age 
cohort. 
All subjects will receive once a day edoxaban tablet(s) of 15 mg 
and/or 30 mg strength if they are at least 12 years of age.  
Subjects younger than 12 years of age will receive edoxaban 
granules for oral suspension.  In each cohort, doses will be 
selected to elicit target exposures comparable to those achieved 
from adult doses of 60 mg if no dose adjustment needed. 
Dosing regimen for each age cohort will be determined from 
Phase 1 single dose Study U157 and population based PK. 
The dose for the 12 to <18 years of age cohort was selected 
from the Study DU176b-A-U157 data that were available when 
this Study U312 was first designed (see Section 5.1.1.1.1).  
Based on subsequent IDMC review of Cohort 1 (12 to <18 years 
of age) data from this Study U312 and corresponding cohort 
data from Study U157, the proposed dose for 6 to <12 years and 
2 to < 6 years cohort is proposed; for subjects < 2 years, the 
final dose for the cohort  is based upon IDMC recommendation 
(see Section 5.1.1.1.2). 
Subjects will be instructed to take edoxaban (tablets or granules) 
orally once a day, at the same time every day, with or without 
food.  Tablets should be swallowed with a glass of water.  
Edoxaban dosage regimen will be reduced (see Table 5.1 the 
following reasons: 
Body Weight (BW) <5th percentile of subject’s age (see 
Appendix 17.9)  
 The edoxaban dosage regimen will be reduced 
permanently for subjects with moderate renal 
impairment (eGFR) ≥30% to ≤50% of normal for the 
subject’s age and size at randomization as 
determined by the age-appropriate formula: 
Cockcroft-Gault equation for pediatric subjects 
≥12 years of age and modified Schwartz equation for 
pediatric subjects <12 years of age (Appendix 17.7).  
If a subject experiences a change in renal function 
from normal to eGFR ≥30% to ≤50% after 
randomization, the measurement will be repeated 
within 1 week to 10 days after correction of the 
underlying factor’s causing pre-azotemia.  If the 
repeat measurement confirms the reduced eGFR, the 
edoxaban dose will be reduced permanently.  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 17 
 Additionally, if a subject requires concomitant 
administration of a certain P-glycoprotein (P-gp) 
inhibitor (Appendix 17.4.6), the edoxaban dose will 
be reduced during P-gp administration and re-
established to the original dose once P-gp inhibitor 
administration had concluded. 
 Subject is ≤28 days old (corrected for gestation age 
of 38 weeks).  This may change based on the IDMC 
recommendation. 
Randomization to Standard of Care Treatment Arm 
Standard of care treatment will be dispensed to the subject on a 
monthly visit schedule.  After Month 3, on a case-by-case basis, 
confirmed by the Sponsor, a 3-month dispense may occur to 
facilitate subject travel arrangements. 
Local SOC sourcing: 
The SOC will be provided by the Investigator.  Subject will be 
treated with LMWH, VKA, or SP Xa inhibitors according to the 
site SOC treatment regimen (see Section 5.1.1.2). 
Central/Sponsor Sourcing: 
However, if there are regulatory or site hurdles providing the 
SOC, the Sponsor will provide SOC as enoxaparin or 
fondaparinux or warfarin as follows:  
 Enoxaparin – Subjects will be treated with 
enoxaparin alone or can be switched to warfarin 
anytime during the study treatment period. 
 Enoxaparin (LMWH) will be provided to the 
subjects as solution for subcutaneous (SC) 
injection in pre-filled syringes with 60 mg/0.6 
mL, 80 mg/0.8 mL, and 100 mg/1.0 mL 
concentration for injection, or as multiple dose 
vials (for subjects <10 kg) for injection where 
allowed per standard clinical practice. 
 Fondaparinux – Subjects will be treated with 
fondaparinux alone or can be switched to warfarin 
anytime during the study treatment period. 
 Fondaparinux will be supplied as solution for SC 
injection in pre-filled syringes (2.5 mg/0.5 mL, 
5.0 mg/0.4 mL, 7.5 mg/0.6 mL, 10.0 mg/0.8 mL, 
and where available 1.5 mg/0.3 mL). 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 18 
 Warfarin will be supplied as tablets (0.5 mg, 1.0 mg, 
and 3.0 mg). 
For subjects in whom clinicians prescribe warfarin, then 
warfarin will be started on Day 1.  Heparin (enoxaparin or 
fondaparinux or UFH depending on the therapy received during 
pre-randomization period) will be discontinued when INR ≥2.0 
and ≤3.0 for 2 consecutive measurements obtained at least 24 to 
48 hours apart.  The subject will continue warfarin for the 
remainder of the study treatment period. 
Study Endpoints: 
All safety and efficacy endpoints described below will be 
adjudicated in a blinded manner by the Clinical Events 
Committee (CEC). 
Primary Efficacy Endpoint: 
The primary efficacy endpoint is a composite endpoint 
consisting of the incidence of symptomatic recurrent venous 
thromboembolic disease, death as a result of VTE, and no 
change or extension of thrombotic burden (Section 7.1) during 
the first 3 months period. 
-For subjects in Cohort 5, (ie, <6 months old), the primary 
efficacy endpoint is a composite endpoint consisting of the 
incidence of symptomatic recurrent VTE, death as a result of 
VTE, and no change or extension of thrombotic burden 
within 6 to12 weeks + 3 days. 
Secondary Efficacy Endpoints: 
The secondary efficacy endpoints include: 
 A composite endpoint consisting of symptomatic 
recurrent venous thromboembolic disease, death as a 
result of VTE, and no change or extension of 
thrombotic burden from randomization to the date of 
the last dose of study drug + 30 days . 
 The individual components of the primary efficacy 
endpoint during the first 3-month period (for Cohort 
5, the intended duration of treatment is 6-12 weeks): 
 Symptomatic recurrent VTE  
 Death as a result of VTE 
 No change or extension of thrombotic burden  
 All-cause mortality from randomization to last dose 
+ 30 days. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 19 
 The DVT, Catheter-related thrombosis, PE, 
sinovenous thrombosis events within and after the 
first 3-month treatment period (for Cohort 5, the 
intended duration of treatment is 6-12 weeks). 
Net Clinical Outcome Endpoint: 
 Composite of symptomatic recurrent VTE events, 
death as a result of VTE, and major and CRNM 
bleeding that occurred from the date of the first dose 
of study drug to the date of last dose of study drug + 
30 days. 
Safety Endpoints: 
The safety endpoints are:   
 A combination of major and CRNM bleedings 
occurring during treatment or within 3 days of 
completing or interrupting or stopping study during 
the first 3-month treatment period.   
 For subjects in Cohort 5, (ie,<6 months old), the 
primary safety endpoint is a combination of 
major and CRNM bleedings occurring during 
treatment or within 3 days of completing or 
interrupting or stopping study within 6 to 12 
weeks + 3 days. 
 All bleedings from first to the last dose + 30 days. 
 A combination of major and CRNM bleedings from 
first to the last dose + 30 days.  
Pharmacokinetic and Pharmacodynamic Endpoints:  
Approximately, the first 12 subjects of each age cohort (total of 
approximately 53 to 60 subjects) randomized to the edoxaban 
treatment arm will participate in the multiple-dose PK/PD 
assessment on Day 5 
Pharmacokinetics: 
 Using population PK analysis, the following PK 
parameters will be estimated: apparent systemic 
clearance (CL/F) and apparent volume of distribution 
(V/F) of edoxaban.  
Pharmacodynamics: 
 The following biomarkers of coagulation will be 
estimated: PT, aPTT, anti-FXa for edoxaban 
treatment arm.   

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 20 
Planned Sample Size: 
This is an event driven trial and the total number of subjects 
randomized to treatment may be adjusted to ensure 
accumulation of 68 events in the mITT Analysis Set during the 
Main Treatment Period (Interim Analysis). 
Assuming that the edoxaban group will observe a 24% reduction 
of the event rate relative to SOC and a non-inferiority margin of 
1.5, then the study with 68 total primary endpoint events will 
have approximately 80% of power to demonstrate non-
inferiority with alpha=0.05 (two sided).  Assuming that 28% of 
event rate in the SOC-treatment group, 274 subjects, 137 
subjects per treatment group, will be the randomization target 
for the study.   
Statistical Analyses: 
Analysis Sets: 
Randomized Analysis Set will include all subjects who are 
randomized.   
Safety Analysis Set will include all subjects in the Randomized 
Analysis Set who received at least one dose of study drug 
actually taken. 
Modified intent-to-treat (mITT) Analysis Set will include all 
subjects in the Randomized Analysis Set who received at least 
one dose of randomized study drug.  
Per-protocol (PP) Set will include all subjects in the mITT 
Analysis Set who are sufficiently compliant with the protocol.  
Criteria of sufficiently compliant will be detailed in SAP. 
PK Analysis Set will include all subjects in the Safety Analysis 
Set who had at least one PK sample with measurable 
concentration.   
PD Analysis Set will include all subjects in the Safety Analysis 
Set who had at least one measurable PD sample.   
Efficacy Analyses: 
Primary Efficacy Analyses: 
The primary efficacy endpoint is a composite endpoint, 
including symptomatic recurrent venous thromboembolic 
disease, death as result of VTE, and no change or extension of 
thrombotic burden based on imaging during the first 3-month 
treatment period (ie, primary efficacy events occurring from 
randomization through the end of the 3-month treatment period). 
For subjects in Cohort 5,( ie, <6 months old), the primary 
efficacy endpoint is a composite endpoint consisting of the 
incidence of symptomatic recurrent VTE, death as a result of 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 21 
VTE, and no change or extension of thrombotic burden within 
6 to 12 weeks + 3 days.  The primary efficacy analysis will be 
based on mITT Analysis Set.  Analyses will be based on the 
randomized treatment even if a subject inadvertently receives 
the incorrect study drug. 
In this analysis, the time to the first event of the composite 
primary efficacy outcome will be analyzed using a Cox’s 
proportional hazard regression model including treatment and 
age groups as covariates.   
The edoxaban-to-comparator hazard ratio will be computed with 
95% confidence interval [CI] (two-sided) based on this model. 
Edoxaban will be considered non-inferior to comparator if the 
upper limit of the 95% CI is <1.5. 
If non-inferiority of edoxaban is established, edoxaban will be 
tested for superiority to comparator.  Edoxaban will be 
considered superior to comparator if the upper limit of the 95 % 
CI from above analysis is <1.0. 
The same proportional hazard model used for primary efficacy 
analysis will be performed for PP Analysis Set and Randomized 
Analysis Set as sensitivity analyses. 
Secondary Efficacy Analyses: 
The following secondary efficacy endpoints will be analyzed: 
 For the composite endpoint, including symptomatic 
recurrent venous thromboembolic disease, death as 
result of VTE, and no change or extension of 
thrombotic burden from the randomization to the 
date of the last dose of study medication + 30 days, 
the proportional hazard model similar to primary 
efficacy analysis will be used based on mITT and PP 
Analysis Set 
 Incidence of all-cause mortality from randomization 
to the date of the last dose of study drug + 30 days 
will also be summarized by treatment arm for the 
mITT Analysis Set 
 The incidence of each component (symptomatic 
recurrent venous thromboembolic disease, death as 
result of VTE and no change or extension of 
thrombotic burden) of the composite primary 
endpoint occurred during the first 3 month treatment 
period (for Cohort 5, the intended duration of 
treatment is at least 6 to 12 weeks) will be 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 22 
summarized by treatment arm for the mITT and PP 
Analysis Sets 
 The occurrence of DVT, catheter-related thrombosis, 
sinovenous thrombosis, and PE during the first 3 
month treatment period, after 3 month treatment 
period (for Cohort 5, the intended duration of 
treatment is 6 to12 weeks), as well as whole study 
period will be summarized by treatment arm for the 
mITT Analysis Set 
Net Clinical Outcome Endpoint analyses:  
 Incidence of net clinical outcome, defined as the 
composite of symptomatic recurrent VTE events, 
death as a result of VTE, and major and CRNM 
bleeding from the first dose to the last dose + 30 
days, will be analyzed using the similar proportional 
hazard regression model will be summarized by 
treatment based on mITT and per- protocol (PP) 
Analysis Sets. 
Safety Analyses: 
Analysis of Safety Endpoint 
An analysis will be performed for the composite of safety 
endpoints of major and CRNM bleeding events which occurred 
on-treatment from the first dose of study treatment to 3 month + 
3 days, or to the last dose of the study treatment + 3 days, 
whichever occurred first.  An event will be considered an “On-
Treatment” event if it occurred while on randomized treatment 
or within 3 days of randomized study drug interruption or 
discontinuation. 
The time to “On-Treatment” major or CRNM bleeding will be 
compared between treatment groups for subjects in the Safety 
Analysis Set, using a similar Cox’s proportional hazard 
regression model as described in the primary efficacy analysis.  
Analyses will be based on the randomized treatment, unless a 
subject inadvertently receives the incorrect drug during the 
entire study, in which case, the subject will be grouped 
according the treatment actually received. 
The incidence of bleeding events will also be summarized by 
treatment group for the Safety Analysis Set and on-treatment 
period. 
Interim Analysis: 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 23 
An interim assessment of incidence rate of the composite 
efficacy endpoint in both arms of the study will take place after 
first 140 subjects (about 50% of subjects) complete the first 3 
months of treatment.  This will allow for adjustment of number 
of subjects in the study if necessary.  
Pharmacokinetic/Pharmacodynamic Analyses: 
Pharmacokinetic and PD data collected on Day 5 (5th edoxaban 
dose) from a subgroup of subjects dosed with edoxaban will be 
analyzed to confirm that the dose used in Phase 3 (based on 
single dose PK/PD pediatric data) is indeed providing the 
expected exposure. 
Plasma concentration and biomarker data will be summarized by 
age, dose, and time point using descriptive statistics and will be 
included in the clinical study report for this study.  The plasma 
concentration data will be pooled with data from other studies 
for a population PK analysis using nonlinear mixed effects 
modeling; the results will be provided in a separate report from 
the clinical study report for this study.  
Exposure response relationships will be evaluated using 
Bayesian estimates of edoxaban exposure metrics (such as Cav, 
Cmax, Ctrough, and AUC) to explore relationships with safety and 
efficacy endpoints through a model based approach; the results 
will be provided in a separate report from the clinical study 
report for this study. 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 24 
TABLE OF CONTENTS 
INVESTIGATOR AGREEMENT...................................................................................................2 
GLOBAL AMENDMENT, PROTOCOL VERSION 4.0 ...............................................................3 
PROTOCOL SYNOPSIS ................................................................................................................5 
LIST OF ABBREVIATIONS ........................................................................................................32 
1. 
INTRODUCTION ...........................................................................................................35 
1.1. 
Background ......................................................................................................................35 
1.2. 
Study Rationale ...............................................................................................................36 
1.3. 
Benefit/Risk .....................................................................................................................37 
2. 
STUDY OBJECTIVES AND HYPOTHESIS ................................................................38 
2.1. 
Study Objectives ..............................................................................................................38 
2.1.1. 
Primary Objective ............................................................................................................38 
2.1.2. 
Secondary Objectives ......................................................................................................38 
2.1.3. 
Exploratory Objectives ....................................................................................................39 
2.2. 
Study Hypothesis .............................................................................................................39 
3. 
STUDY DESIGN ............................................................................................................40 
3.1. 
Overall Design .................................................................................................................40 
3.2. 
Discussion of Study Design .............................................................................................41 
3.3. 
End of Study ....................................................................................................................44 
4. 
STUDY POPULATION ..................................................................................................45 
4.1. 
Inclusion Criteria .............................................................................................................45 
4.2. 
Exclusion Criteria ............................................................................................................45 
4.3. 
Additional Requirements .................................................................................................46 
4.3.1. 
Stopping Rules for Age-based cohort during PK/PD assessment: ..................................46 
4.3.2. 
Stopping Rules for Study: ...............................................................................................47 
5. 
STUDY TREATMENT(S) ..............................................................................................48 
5.1. 
Assigning Subjects to Treatments and Blinding .............................................................48 
5.1.1. 
Treatment Group(s) .........................................................................................................48 
5.1.1.1. Edoxaban Treatment Arm ...............................................................................................48 
5.1.1.2. Standard of Care Treatment Arm ....................................................................................50 
5.1.2. 
Method of Treatment Allocation .....................................................................................51 
5.1.3. 
Blinding ...........................................................................................................................52 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 25 
5.1.4. 
Emergency Unblinding Procedure ..................................................................................52 
5.2. 
Study Drug(s) ..................................................................................................................52 
5.2.1. 
Description ......................................................................................................................52 
5.2.2. 
Labeling and Packaging ..................................................................................................53 
5.2.3. 
Preparation .......................................................................................................................53 
5.2.4. 
Administration .................................................................................................................53 
5.2.4.1. Instruct the subject to begin taking edoxaban .................................................................54 
5.2.4.2. Instruct the subject randomized to SOC treatment ..........................................................54 
5.2.5. 
Storage .............................................................................................................................55 
5.2.6. 
Drug Accountability ........................................................................................................55 
5.3. 
Dose Interruptions and Reductions .................................................................................56 
5.3.1. 
Edoxaban Dose Reduction ..............................................................................................57 
5.4. 
Method of Assessing Treatment Compliance ..................................................................57 
5.5. 
Prior and Concomitant Medications ................................................................................57 
5.6. 
Subject Withdrawal or Discontinuation ..........................................................................58 
5.6.1. 
Discontinuation from Treatment within the Main Treatment Period (Month 3) .............58 
5.6.2. 
Discontinuation from Treatment and Study beyond Month 3 up to 12 Month ...............59 
5.6.3. 
Reasons for Discontinuation of Study Treatment ...........................................................59 
5.6.4. 
Reasons for Withdrawal at any Time During the Study ..................................................60 
5.6.5. 
Discontinuation Procedures .............................................................................................60 
5.6.6. 
Follow-up Procedures ......................................................................................................61 
5.6.6.1. Temporary Interruption of Study Drug ...........................................................................62 
5.6.6.2. Subject Re-Screening Procedures ....................................................................................62 
6. 
STUDY PROCEDURES .................................................................................................63 
6.1. 
Screening: Study Qualification (At least Day -5 to -1, Visit 1) ......................................63 
6.1.1. 
Screening Period Prior to Randomization .......................................................................65 
6.2. 
Randomization (Day 1, Visit 2) .......................................................................................65 
6.3. 
Main Treatment Period ....................................................................................................66 
6.3.1. 
Subjects randomized to the edoxaban treatment arm: .....................................................66 
6.3.1.1. Study Day 5 (+3 days) for Subjects Randomized to Edoxaban Only (Visit 2a) .............67 
6.3.2. 
Subjects randomized to the SOC treatment arm: ............................................................68 
6.3.3. 
Monthly Visits (Months 1 and 2; Visits 3 and 4) for both arms: ....................................69 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 26 
6.3.3.1. Month 1 Visit (Visit 3) Procedures .................................................................................69 
6.3.3.2. Month 2 (Visit 4) Procedures ..........................................................................................69 
6.3.4. 
End of Main Treatment Period Visit (Month 3 or at least 6-12 weeks for Cohort 
5, Visit 5) Procedures ......................................................................................................70 
6.4. 
Extension Period (beyond Month 3 - Month 6, 9 and 12; Visits 6, 7, 8) ........................70 
6.4.1. 
Month 6 (Visit 6) Procedures: .........................................................................................71 
6.4.2. 
Month 9 (Visit 7) Procedures: .........................................................................................71 
6.4.3. 
Month 12 / Discontinuation Visit (Visit 8; Appropriate only for subjects treated 
beyond Month 3 and discontinuing study prior to Month 12 Procedures): .....................72 
6.5. 
Required 30 Day Follow-Up Visit (Visit 9) ....................................................................72 
6.5.1. 
Follow-up for Subjects Ending/ Completing Study at Month 3 ......................................72 
6.5.2. 
Follow-Up for Subject Continuing Study beyond Month 3 ............................................73 
7. 
EFFICACY ASSESSMENTS .........................................................................................74 
7.1. 
Primary Efficacy Endpoint(s) ..........................................................................................74 
7.2. 
Secondary Efficacy Endpoint(s) ......................................................................................78 
7.3. 
Exploratory Efficacy Endpoint(s) ....................................................................................78 
7.4. 
Clinical Outcome Endpoint .............................................................................................78 
7.5. 
Appropriateness of Selected Efficacy Endpoint(s) ..........................................................78 
8. 
PHARMACOKINETIC/PHARMACODYNAMIC ASSESSMENTS ...........................80 
8.1. 
Pharmacokinetic (PK) Endpoint(s) ..................................................................................81 
8.2. 
Pharmacodynamic (PD) Endpoint(s) ...............................................................................81 
8.3. 
Biomarker Endpoint(s) ....................................................................................................81 
8.4. 
Immunogenicity ...............................................................................................................81 
8.5. 
Pharmacogenomic Analysis ............................................................................................81 
9. 
SAFETY EVALUATION AND REPORTING ..............................................................82 
9.1. 
Adverse Event Collection and Reporting ........................................................................82 
9.2. 
Safety Endpoint Event(s) .................................................................................................83 
9.2.1. 
Bleeding ...........................................................................................................................83 
9.3. 
Events of Special Interest ................................................................................................86 
9.3.1. 
Liver Enzyme Abnormalities/Liver Dysfunction ............................................................86 
9.4. 
Adverse Event .................................................................................................................87 
9.4.1. 
Definition of Adverse Event ............................................................................................87 
9.4.2. 
Serious Adverse Event ....................................................................................................87 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 27 
9.4.3. 
Severity Assessment ........................................................................................................88 
9.4.4. 
Causality Assessment ......................................................................................................88 
9.4.5. 
Action Taken Regarding Study Drug(s) ..........................................................................89 
9.4.6. 
Other Action Taken for Event .........................................................................................89 
9.4.7. 
Adverse Event Outcome ..................................................................................................89 
9.5. 
Serious Adverse Events and Adverse Event of Special Interest Reporting–
Procedure For Investigators .............................................................................................90 
9.6. 
Notifying Regulatory Authorities, Investigators, and Institutional Review 
Board/Ethics Committee .................................................................................................91 
9.7. 
Exposure In Utero During Clinical Studies .....................................................................91 
9.8. 
Clinical Laboratory Evaluations ......................................................................................92 
9.8.1. 
Hematology .....................................................................................................................92 
9.8.2. 
Blood chemistry ...............................................................................................................92 
9.8.3. 
Estimated Glomerular Filtration Rate (eGFR) Assessment ............................................93 
9.8.4. 
Urinalysis .........................................................................................................................93 
9.8.5. 
Hepatitis Serology (to be performed only when indicated and for Hy’s Law 
cases [LFT ≥3 × and bilirubin ≥2 × ULN]) .....................................................................93 
9.8.6. 
Pregnancy Testing ...........................................................................................................93 
9.9. 
Vital Signs .......................................................................................................................94 
9.10. 
Physical Examinations .....................................................................................................94 
9.11. 
Other Examinations .........................................................................................................94 
10. 
OTHER ASSESSMENTS ...............................................................................................95 
11. 
STATISTICAL METHODS ...........................................................................................96 
11.1. 
Analysis Sets ...................................................................................................................96 
11.2. 
General Statistical Considerations ...................................................................................96 
11.3. 
Study Population Data .....................................................................................................96 
11.4. 
Statistical Analysis ..........................................................................................................97 
11.4.1. Efficacy Analyses ............................................................................................................97 
11.4.1.1. Primary Efficacy Analyses ..............................................................................................97 
11.4.1.2. Secondary Efficacy Analyses ..........................................................................................98 
11.4.1.3. Exploratory Efficacy Analyses ........................................................................................99 
11.4.1.4. Clinical Benefit Analysis .................................................................................................99 
11.4.2. Pharmacokinetic/Pharmacodynamic Analyses ................................................................99 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 28 
11.4.2.1. Pharmacokinetic Analyses ...............................................................................................99 
11.4.2.2. Pharmacodynamic Analyses ............................................................................................99 
11.4.2.3. Biomarker Analyses ........................................................................................................99 
11.4.2.4. Pharmacogenomic Analyses ............................................................................................99 
11.4.3. Safety Analyses ...............................................................................................................99 
11.4.3.1. Analysis of bleeding events ...........................................................................................100 
11.4.3.2. Adverse Event Analyses ................................................................................................100 
11.4.3.3. Clinical Laboratory Evaluation Analyses ......................................................................101 
11.4.3.4. Vital Sign Analyses .......................................................................................................101 
11.4.3.5. Physical Examination Analyses ....................................................................................101 
11.4.3.6. Other Analysis ...............................................................................................................101 
11.5. 
Interim Analyses ............................................................................................................102 
11.5.1. Independent Data Monitoring Committee .....................................................................102 
11.6. 
Sample Size Determination ...........................................................................................102 
11.7. 
Statistical Analysis Process ...........................................................................................102 
12. 
DATA INTEGRITY AND QUALITY ASSURANCE ................................................103 
12.1. 
Monitoring and Inspections ...........................................................................................103 
12.2. 
Data Collection ..............................................................................................................103 
12.3. 
Data Management ..........................................................................................................104 
12.4. 
Study Documentation and Storage ................................................................................104 
12.5. 
Record Keeping .............................................................................................................105 
13. 
FINANCING AND INSURANCE ................................................................................106 
13.1. 
Finances .........................................................................................................................106 
13.2. 
Reimbursement, Indemnity, and Insurance ...................................................................106 
14. 
PUBLICATION POLICY .............................................................................................107 
15. 
ETHICS AND STUDY ADMINISTRATIVE INFORMATION .................................108 
15.1. 
Compliance Statement, Ethics and Regulatory Compliance .........................................108 
15.2. 
Subject Confidentiality ..................................................................................................108 
15.3. 
Informed Consent ..........................................................................................................108 
15.4. 
Regulatory Compliance .................................................................................................109 
15.5. 
Protocol Deviations .......................................................................................................110 
15.6. 
Supply of New Information Affecting the Conduct of the Study .................................110 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 29 
15.7. 
Protocol Amendments ...................................................................................................111 
15.8. 
Study Termination .........................................................................................................111 
15.9. 
Independent Data Monitoring Committee (IDMC) .......................................................111 
15.10. 
Clinical Events Committee ............................................................................................112 
15.11. 
Steering Committee/Executive Committee ...................................................................112 
15.12. 
Address List ...................................................................................................................112 
15.12.1. Sponsor ..........................................................................................................................113 
15.12.2. Contract Research Organization ....................................................................................113 
16. 
REFERENCES ..............................................................................................................114 
17. 
APPENDICES ...............................................................................................................116 
17.1. 
Schedule of Events ........................................................................................................116 
17.2. 
Additional Information on Investigational Product Use in Pediatric Subjects ..............123 
17.3. 
Effective Methods of Birth Control ...............................................................................124 
17.4. 
Prohibited Concomitant Medications ............................................................................125 
17.4.1. Antiplatelet Drugs .........................................................................................................125 
17.4.2. Oral Anticoagulants Other than Study Drug .................................................................126 
17.4.3. Parenteral Anticoagulants ..............................................................................................126 
17.4.4. Intravenous Fibrinolytics ...............................................................................................126 
17.4.5. NSAIDs (excluding aspirin) ..........................................................................................126 
17.4.6. P-gp Inhibitors List (Not Prohibited Medication but Requires Dose Adjustment) .......127 
17.4.7. P-gp Inducers List (Prohibited Medication) ..................................................................127 
17.5. 
Transition from Edoxaban to Other Anticoagulants .....................................................128 
17.6. 
Management of Serious/Life-Threatening Bleeding .....................................................128 
17.7. 
Estimated Glomerular Filtration Rate (eGFR) Assessment ..........................................131 
17.8. 
Blood Pressure Levels for Boys and Girls by Age and Height .....................................132 
17.9. 
Growth Chart (2 to 20 years and Birth to 24 Months) ..................................................136 
17.10. 
Instructions for Specimen Collection, Storage and Shipment .......................................139 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 30 
LIST OF TABLES 
Table 5.1: Edoxaban Dose Recommended For All 5 Cohorts (12 to <18 years, 6 to <12 
years, 2 to <6 years, 6 months to <2 years, and birth to <6 months) ..........................49 
Table 5.2: Classification of Discontinuation and Withdrawal Status for Subjects by 
Scheduled Visit ...........................................................................................................61 
Table 8.1: Edoxaban PK/PD Sampling Visits and Collection Times ..........................................81 
Table 9.1: Hematology Analyses .................................................................................................92 
Table 9.2: Blood Chemistry .........................................................................................................92 
Table 9.3: Urinalysis Determinations ..........................................................................................93 
Table 17.1: Schedule of Events ...................................................................................................117 
Table 17.2: Doses of LMWH (enoxaparin) used in Pediatric Subjects .......................................123 
Table 17.3: Protocol for Anticoagulation Therapy to maintain an INR between 2.0 and 
3.0 for Pediatric Subjects (Warfarin treatment) ........................................................123 
Table 17.4: Doses of Fondaparinux .............................................................................................124 
Table 17.5: P-gp Inhibitors List ...................................................................................................127 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 31 
LIST OF FIGURES 
Figure 3.1: Study Design ...............................................................................................................40 
Figure 3.2: Enrollment Strategy Schema in U157, U312 and Between U157 and U312 
Study ...........................................................................................................................41 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 32 
LIST OF ABBREVIATIONS 
ABBREVIATION 
DEFINITION 
AE 
Adverse event 
ALP 
Alkaline phosphatase 
ALT 
Alanine transaminase 
ANA 
Antinuclear antibody 
AST 
Aspartate transaminase 
AUC 
Area under the concentration curve 
BP 
Blood pressure 
CEC 
Clinical Events Committee 
CFR 
Code of Federal Regulations 
CI 
Confidence interval 
CMV 
Cytomegalovirus 
COX-1 
Cyclooxygenase-1 
COX-2 
Cyclooxygenase-2 
CRF 
Case report form 
CRO 
Contract Research Organization 
CRNM 
Clinically relevant non-major  
CTA 
Computed tomography angiogram 
DOACs 
Direct Oral Anticoagulants 
DVT 
Deep vein thrombosis 
EBV 
Epstein-Barr virus 
eCRF 
Electronic Case Report Form 
EDC 
Electronic Data Capture 
EEA 
European Economic Area 
eGFR 
Estimated glomerular filtration rate 
EIU 
Exposure in utero 
EOT 
End of Treatment 
ENT 
Ears, nose, throat 
FDA 
Food and Drug Administration 
FXa 
activated Factor X  
GCP 
Good Clinical Practice (refers to ICH and CFR) 
GI 
Gastrointestinal 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 33 
ABBREVIATION 
DEFINITION 
ICF 
Informed Consent Form 
IDMC 
Independent Data Monitoring Committee 
IEC 
Independent Ethics Committee 
INN 
International Non-proprietary Name 
INR 
International normalized ratio 
IMP 
Investigational Medicinal Product 
IRB 
Institutional Review Board 
ISTH 
International Society on Thrombosis and Haemostasis 
IV 
Intravenous  
IXRS 
Interactive Web/Voice Response System 
LE 
Lower extremity 
LFT 
Liver function test 
LMWH 
Low molecular weight heparin 
MedDRA 
Medical Dictionary for Regulatory Activities 
mITT 
Modified intent-to-treat 
MRI 
Magnetic resonance imaging 
NI 
Non-inferiority 
NSAIDs 
Non-steroidal anti-inflammatory drugs 
NVAF 
Non-valvular atrial fibrillation 
OTC 
Over-the-counter 
P-gp 
P-glycoprotein 
PD 
Pharmacodynamic 
PE 
Pulmonary embolism 
PI 
Principal Investigator 
PK 
Pharmacokinetic 
PP 
Per protocol 
PROBE 
Prospective, randomized, open-label, blinded endpoint evaluation 
PT 
Prothrombin time 
aPTT 
Activated partial thromboplastin time 
PTS 
Post-thrombotic syndrome 
QD 
Once a day 
RFT 
Renal function test 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 34 
ABBREVIATION 
DEFINITION 
SAE 
Serious adverse event 
SAP 
Statistical analysis plan 
SAVER 
Serious adverse events reporting  
SC 
Subcutaneous 
SOC 
Standard of care 
SOP 
Standard Operating Procedures 
SP  
Synthetic Pentasaccharide  
SSC 
Scientific and Standardization Committee 
SUSAR 
Suspected Unexpected Serious Adverse Reaction 
TBL 
Total bilirubin level 
TEAE 
Treatment-emergent adverse event 
UE 
Upper extremity 
UFH 
Unfractionated heparin 
ULN 
Upper limit of normal 
VKA 
Vitamin K antagonist 
V/Q 
Nuclear ventilation/perfusion  
VTE 
Venous thromboembolism/venous thromboembolic 
WBC 
White blood cell 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 35 
1. 
INTRODUCTION 
1.1. 
Background 
The clinical presentation of pediatric venous thromboembolic (VTE) disease includes many 
manifestations, such as catheter-related thrombosis, pulmonary embolism (PE), deep vein 
thrombosis (DVT), and sinovenous thrombosis.  The majority of pediatric subjects (>95%) with 
VTE have at least 1 clinical risk factor. 
Currently, the presence of a central venous catheter is the most important acquired trigger for the 
development of venous thromboembolic disease in pediatric subjects, contributing to >90% of all 
neonatal thrombi and more than half of all thrombi in the older children1, 2 3, 4.  Several 
mechanisms play a role in the development of catheter related thrombosis, including vessel wall 
injury by the catheter or infused substances (especially parenteral nutrition), compromised blood 
flow, and thrombogenic effects of the catheter material5.  Catheter-related thrombi develop in 
children with long-term venous access devices for diseases such as malignancy, intestinal failure, 
renal insufficiency, and cystic fibrosis and in children with short-term catheters on the intensive 
care unit or for cardiac catheterization6, 7, 8.  Other important risk factors for pediatric thrombosis 
are congenital heart disease, surgery, immobilization, malignancy, nephrotic syndrome, sepsis, 
and estrogen treatment.  The presence of congenital prothrombotic disorders contribute to the 
development of pediatric venous thrombosis, as well9.   
Increasing numbers of pediatric subjects with chronic diseases will require anticoagulation as the 
incidence of VTE events rises due to hypercoagulability and the use of central venous 
catheters10.  
Currently, the majority of pediatric thrombi are treated with low molecular weight heparin 
(LMWH) or unfractionated heparin (UFH) followed by LMWH or vitamin K antagonists 
(VKAs) for a total of 3 to 6 months11.  More recently, data exists for the use of fondaparinux in 
children12, 13.  Subjects should receive LMWH, UFH, or fondaparinux for at least 5 days 
following diagnosis of VTE.  Guidelines recommend starting VKA on the first treatment day 
because of slow onset of action.  LMWH, UFH, or fondaparinux may be discontinued when the 
VKA has reached its therapeutic level, as indicated by an international normalized ratio (INR) 
≥2.0 for 2 or more measurements at least 24 hours apart.  Many pediatric subjects have severe 
underlying diseases which preclude early oral treatment and thus LMWH is continued. 
In children, the outcome of venous thromboembolic disease has been reported in several studies.  
The REVIVE trial, a randomized controlled trial comparing LMWH with UFH and VKAs 
showed a direct mortality rate of 0% in both groups after 3 months14.  In the Canadian outcome 
study mortality as result of thrombosis was 2.2%15.  In the REVIVE trial, recurrent thrombosis 
occurred in 12.5% of the subjects in the UFH/VKA group and 5.6% in the LMWH group after 3 
months of treatment.14 The recurrence-free survival after 6 months was 93% in pediatric subjects 
of one center in the Netherlands4.  Most subjects were treated with LMWH or UFH followed by 
VKAs.  Merkel et al followed 27 subjects treated with LMWH.  After a mean time of 2.3 years 
(range: 0.5 to 6.25 years), 55.6% of the subjects showed complete resolution with radiographic 
tests, 29.6% partial resolution, and 14.8% no resolution16.  Newall et al studied radiographic 
outcome of 22 infants (<6 months old) and 73 children (≥6 months old) after 5 days to 4.2 years.  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 36 
In infants and children, complete resolution occurred in 53% and 47%, partial resolution in 29% 
and 36%, and no resolution or extension in 18% and 17%, respectively17.   
Post-thrombotic syndrome (PTS) is a manifestation of chronic venous insufficiency following 
DVT.  Children with PTS must endure chronic sequelae for many decades18.  Goldenberg et al 
showed that PTS occurrence varied widely (<10% to 70%) depending on the scoring system; the 
calculated mean frequency of PTS was 26% (95% confidence interval [CI]: 23% to 28%) among 
a total of nearly 1000 subjects with upper extremity (UE)/lower extremity (LE) DVT.  In the 
cross-sectional study19, multiple logistic regression analysis revealed that lack of thrombus 
resolution was associated with a statistically significant 4 fold increase in odds of PTS.  
Therefore we propose to evaluate edoxaban on the reduction of thrombotic burden defined by 
“no change and extension” of the thrombus at the month 3 visit.   
Edoxaban is an oral direct inhibitor of activated Factor X with predictable pharmacokinetics 
(PK) and pharmacodynamics (PD).  As a result, anticoagulant effects are more likely to remain 
within the therapeutic range, thereby decreasing the likelihood of bleeding, and potentially 
removing the need for dose adjustment or frequent monitoring.  These advantages may result in 
increased patient satisfaction and adherence compared with existing anticoagulants   
Edoxaban has been approved for the following indications in the US:  
 To reduce the risk of stroke and systemic embolism (SE) in subjects with nonvalvular 
atrial fibrillation (NVAF) with limitation of use in patients with CrCL >95 mL/min.  
 Treatment of deep vein thrombosis (DVT) and pulmonary embolism (PE) following 5 
to 10 days of initial therapy with a parenteral anticoagulant. 
In the EU and Japan, edoxaban has been approved for the following indications: 
 Prevention of stroke and systemic embolism in adult subjects with nonvalvular atrial 
fibrillation (NVAF) with one or more risk factors, such as congestive heart failure, 
hypertension, age ≥75 years, diabetes mellitus, prior stroke or transient ischemic 
attack (TIA) with no limitation of use. 
 Treatment of deep vein thrombosis (DVT) and pulmonary embolism (PE), and 
prevention of recurrent DVT and PE in adults 
This study will evaluate the benefits and risks of edoxaban in pediatric subjects with 
thromboembolic disease. 
1.2. 
Study Rationale 
Currently available anticoagulants have significant limitations especially in the pediatric 
population.  At the moment, the commonly used agents for long-term anticoagulation in children 
are LMWHs and VKAs.  The important disadvantages of LMWH are subcutaneous (SC) 
administration and thrombocytopenia.  Vitamin K antagonists (such as the coumarins: warfarin, 
acenocoumarol, or phenprocoumon) are indirect coagulation inhibitors, which act by blocking 
the vitamin K dependent liver synthesis of the plasma coagulation factors II, VII, IX, and X.  
These agents have been the only oral anticoagulants available for the last 50 years.  The use of 
VKAs is complicated by several inherent problems including a delayed onset of antithrombotic 
action; a narrow therapeutic index that requires close laboratory monitoring using the INR; an 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 37 
unpredictable and variable pharmacological response; and food and drug interactions requiring 
frequent dosage adjustment20.  Furthermore, as no liquid formulation is available, oral 
administration of VKAs in tablet form is difficult in young children.  Therefore, there exists a 
need for a safe, effective, and more easily managed oral antithrombotic agent for the treatment of 
pediatric subjects with thromboembolic disease. 
1.3. 
Benefit/Risk 
In pediatric subjects, the incidence of children developing recurrent VTE ranges from 3% in 
neonates to 8% in older children and as high as 21% in children reported with a first idiopathic 
VTE.  The results of meta-analyses indicate that 11% of children with non-idiopathic thrombosis 
overall develop a second VTE.  Hence, this study offers a platform by which the identification of 
subjects with non-idiopathic thrombosis or those with potential recurrence may be identified for 
therapeutic care.   
In this U312 study, the risk is considered as minimal for subjects who already took 
anticoagulation therapy due to their health conditions.  U312 is a study with a sequential 
enrollment (from older to younger) with tested doses from a Phase 1 study (U157).  The 
established doses were mirrored to achieve exposures comparable to a 60 mg adult dose in the 
Hokusai VTE adult study where proven efficacy and safety were shown to be non-inferior and 
superior, respectively, to well-controlled warfarin.  
In subjects with no history of thromboembolic events, the risk to receive anticoagulants is 
considered as a minor increase over minimal risk relative to the sequelae caused by a 
thromboembolic event.  Bleeding risk is monitored based on established doses for edoxaban that 
were shown to be safe, and constant therapeutic monitoring of SOC is implemented for the 
alternative treatment in the study.  
In the U312 study, risk was estimated based on experience with similar treatments and 
procedures in the pediatric population and from the well-known edoxaban effects in adults 
(Hokusai-VTE Study).  The benefit to participate in the U312 study can be considered as direct 
for subjects with health conditions exposing them to occurrence and/or recurrence of a 
thromboembolic event.  Furthermore, the traditional anticoagulant drugs (warfarin, UFH, and 
LMWH) have a number of limitations including issues regarding laboratory monitoring, food 
and drug interactions (warfarin), and a narrow therapeutic window.  Most of the parenteral anti-
coagulants are used more for short-term use in the hospital.  VKAs such as warfarin have been 
used widely as oral anti-coagulants for long-term out-patient treatment.  Although warfarin is 
widely used as an oral antithrombotic agent for prophylaxis and treatment of thromboembolism, 
there are clinical limitations to using the drug.  Physicians need to prescribe warfarin very 
carefully in terms of interactions with food and other drugs.  Monitoring warfarin effects on 
coagulation time (PT and INR) is critical for minimizing the risk of bleeding complications.  
Furthermore, there is considerable person-to-person variation in lag time between starting 
warfarin and the onset of appropriate anti-coagulation activity. 
Safer and more effective oral antithrombotic agents are needed for prophylaxis and treatment of 
VTE.  Edoxaban, an oral selective inhibitor of FXa, and might be a candidate to meet this need 
because of more predictable PK without the necessity for laboratory monitoring and dosage 
adjustments; fewer drug/food interactions; and a favorable benefit to risk profile as demonstrated 
in prior Phase 3 studies in adults. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 38 
2. 
STUDY OBJECTIVES AND HYPOTHESIS 
2.1. 
Study Objectives 
2.1.1. 
Primary Objective 
The primary objective is to demonstrate the non-inferiority of edoxaban to standard of care 
(SOC; including low molecular weight heparin (LMWH), vitamin K antagonist (VKA), or 
synthetic pentasaccharide (SP) Xa inhibitors) in the treatment and secondary prevention of VTE 
in pediatric subjects with regard to the composite efficacy endpoint (ie, symptomatic recurrent 
VTE, death as result of VTE, and no change or extension of thrombotic burden) during the first 
3-month treatment period (for Cohort 5, the intended duration of treatment is 6 to12 weeks).   
2.1.2. 
Secondary Objectives 
 To compare edoxaban against SOC with regard to the combination of major and 
clinically relevant non-major (CRNM) bleedings occurring during treatment or within 
3 days of completing or interrupting or stopping study treatment during the first 
3- month treatment period (for Cohort 5, the intended duration of treatment is at least 
6 to 12 weeks).   
 To compare edoxaban against SOC with regard to a combination of major and 
CRNM bleedings and symptomatic recurrent VTE, and death as result of VTE which 
occur from first to the last dose + 30 days. 
 To compare edoxaban against SOC with regard to all bleedings which occur from 
first to the last dose + 30 days. 
 To compare edoxaban against SOC with regard to the composite efficacy endpoint as 
described in the primary objective from randomization to the last dose + 30 days. 
 To compare edoxaban against SOC with regard to all-cause mortality from 
randomization to the last dose + 30 days. 
 To compare edoxaban against SOC with regard to the individual components of the 
composite efficacy endpoints as described in the primary objective during the first 3-
month treatment period (for Cohort 5, the intended duration of treatment is at least  
6 to 12 weeks). 
 To compare edoxaban against SOC with regard to occurrence of DVT, catheter-
related thrombosis, PE, sinovenous thrombosis within and after the first 3-month 
treatment period (for Cohort 5, the intended duration of treatment is at least 6 to 12 
weeks). 
 To compare edoxaban against SOC with regard to a composite combination of major 
and CRNM bleedings from first to the last dose + 30 days. 
 To characterize the multiple dose pharmacokinetics of edoxaban in pediatric subjects 
at Day 5 using population pharmacokinetic (PK) analysis (apparent systemic 
clearance [CL/F] and apparent volume of distribution [V/F]) and to assess the effect 
of covariates such as age, body weight, and renal function on the PK of edoxaban.  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 39 
 To evaluate the relationship between edoxaban exposure and safety (such as 
bleeding) and efficacy (thromboembolic events). 
 To characterize the effect of edoxaban on biomarkers of coagulation (ie, PT, aPTT, 
and FXa).  
2.1.3. 
Exploratory Objectives 
Not applicable. 
2.2. 
Study Hypothesis 
This study is designed to test the hypothesis that the administration of edoxaban after at least 5 
days of heparin (LMWH or SP Xa inhibitors or UFH; with overlapping VKAs if needed) is non-
inferior to SOC (SOC; including LMWH, SP Xa inhibitors and/or VKA) in treating and 
preventing the composite of symptomatic recurrent VTE, death as result of VTE, and no change 
or progression in thrombotic burden after 3 months of therapy.  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 40 
3. 
STUDY DESIGN 
3.1. 
Overall Design 
This is an event driven Phase 3, prospective, randomized, open-label, blinded endpoint 
evaluation (PROBE) parallel group study in subjects with confirmed venous thromboembolism 
(VTE).  A schematic representation of the study design is provided in Figure 3.1.  The parallel 
enrollment strategy schema in U157, U312 and between U157 and U312 is provided in 
Figure 3.2. 
Figure 3.1: 
Study Design 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 41 
Figure 3.2: 
Enrollment Strategy Schema in U157, U312 and Between U157 and U312 
Study 
 
3.2. 
Discussion of Study Design 
This study is designed to evaluate the PK and PD of edoxaban and to compare the efficacy and 
safety of edoxaban with SOC in pediatric subjects with confirmed VTE.  
The adjudication of the efficacy and safety endpoints will be conducted by a blinded adjudication 
committee. 
The study includes two periods:  
 The Main Treatment Period is defined as the time from randomization, until the end 
of Month 3 of treatment. The Main Treatment Period for subjects <6 months old 
(Cohort 5) is defined as the time from randomization until the end of anticoagulant 
therapy for at least 6 to 12 weeks. 
 Subjects who early discontinue the Main Treatment Period will be monthly 
followed according to the Schedule of Events (Table 17.1) through Month 3 visit 
(Visit 5), or earlier (unscheduled interim visit at 6 weeks) for subjects in Cohort 5, 
and 30-day Follow-Up Visit (Visit 9).   

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 42 
 Subjects who complete the Main Treatment Period but do not continue into the 
Extension Period will be followed for 30 days after last dose of study drug (Visit 
9). 
 The Extension Period is discretionary for the Investigator and will include treatment 
from the end of the Main Treatment Period (Month 3, Visit 5) up through the end of 
Month 12 (Visit 8).  
 Subjects who discontinue the treatment at any time after Month 3 will have a 
Month 12/Discontinuation Visit (Visit 8) performed with the subsequent 30 day 
follow-up (Visit 9). 
 Subjects who complete Extension Period treatment at Month 12 (Visit 8) will be 
followed for 30 days after last dose of study drug (Visit 9).  
 Subjects who require anticoagulant treatment after discontinuation of the study 
treatment at any time will be transitioned to a therapy as determined by the 
Investigator. 
The study will attempt to recruit at least 10% of the subjects diagnosed with pulmonary 
embolism. 
About 274 subjects will be included in this randomized study (137 subjects in each treatment 
arm) which will be conducted at clinical sites located worldwide. 
Randomization will be stratified by age cohorts and by region (US/Canada, Europe, Asia/Pacific, 
and Rest of the World).  The total duration of the study is expected to be approximately 4.5 
years. 
After subjects are assessed for eligibility based on a newly diagnosed index VTE by imaging and 
per the inclusion/exclusion criteria, and have undergone bridging treatment for at least 5 days of 
heparin (LMWH or SP Xa inhibitors or UFH; with overlapping VKAs if needed) prior to 
randomization, the subjects will be randomized in a 1:1 ratio into one of the two treatment arms:  
 Edoxaban treatment arm: subjects will receive selected dose of edoxaban   
or  
 SOC treatment arm: subjects will receive SOC anticoagulant according to study site’s 
SOC treatment, as follows (alone or combination): 
 LMWH (alone or followed with VKA) 
 SP Xa inhibitors (alone or followed with VKA) 
 Vitamin K antagonist (VKA) 
In the case of centrally sourced SOC treatment, the Sponsor will only provide enoxaparin as 
LMWH, fondaparinux as SP Xa inhibitor, or warfarin as VKA as mentioned previously. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 43 
The subjects will be recruited into 5 age cohorts: 
 Ages 12 to <18 years   
 Ages 6 to <12 years   
 Ages 2 to <6 years   
 Ages 6 months to <2 years   
 Ages birth to <6 months  
Sequential enrollment of age cohorts will be used for randomization.  The order of enrollment 
will be from the oldest age cohort to the youngest age cohort.  The first age cohort to be 
randomized will be from ages 12 to <18 years.  Doses for all subsequent age cohorts will be 
made by separate notifications to the investigative sites, outside the content of this protocol, and 
after the IDMC has approved the proposed edoxaban doses.  In addition, a notification will 
indicate that Day 5 PK/PD edoxaban exposure evaluation will no longer be necessary for future 
subjects randomized to edoxaban in the corresponding age cohort. 
Subjects in edoxaban treatment arm (137 subjects): 
Starting doses for each age cohort in U312 study will be selected based on edoxaban exposure 
for age-matched subjects and safety data from U157 study (Single-dose PK/PD study in pediatric 
subjects at risk of VTE), and on population based PK.   
Edoxaban treatment will be dispensed to the subject on a monthly visit schedule.  After Month 3, 
a 3-month dispense may be provided based on the Sponsor’s approval to match the study visit 
schedule.  The oldest cohort (12 to <18 years of age) will receive tablets.  All younger age 
cohorts (<12 years) will receive edoxaban granules for oral suspension (see Section 5.1.1.1) and 
will be dosed on an mg/kg basis. 
The enrollment into the first age cohort (12 to <18 years) of U312 study will begin when 
edoxaban dose for this age cohort is selected from a supporting Phase 1 Study U157 (see 
Section 5.1.1.1).  The first 12 subjects of each age cohort (total of 53 to 60 subjects) randomized 
to the edoxaban treatment arm will participate in the multiple-dose PK/PD assessment on Day 5 
(+3 days, Visit 2a) as follows:  
 Ages 12 to <18 years (N≈12) 
 Ages 6 to <12 years (N≈12) 
 Ages 2 to <6 years (N≈12) 
 Ages 6 months to <2 years (N≈12) 
 Ages birth to <6 months (N≈5-12) 
Two blood samples will be collected on the day of the fifth dose of edoxaban (Day 5+3 days, 
Visit 2a) for all age cohorts, including: 
 Pre-dose sample for all approximately 12 subjects.   
 Post-dose sample can be taken at either: 
 any time between 1.0 to 3 hours post-dose 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 44 
or 
 any time between 5 to 8 hours post-dose 
 The PD sampling times on Day 5 for measurement of PT, aPTT and anti-FXa, will be 
taken at the same time as the PK samples.  
 A PK analysis will be performed on the subset of subjects in U312 study.  If the 
analysis confirms the exposure predictions and based on emerging safety, the 
expanded enrollment in the same age cohort will be allowed to start.  A notification 
will be sent to all Investigators that Day 5 visit is no longer necessary and expansion 
of the age cohort is permitted after the PK analysis. 
Enrollment in the next younger age cohorts in U312 study will begin upon the availability of: 
 PK analysis performed on subjects in the prior older age cohort in U312. 
 Safety data analysis on subjects in the prior older age cohort in U312. 
 PK analysis of the subjects in the next younger age cohort in U157. 
 Safety data analysis on the subjects of the next younger age cohort in U157. 
PK and safety data will be reviewed by Independent Data Monitoring Committee (IDMC) 
(Section 15.9) who will approve the start of the next younger age cohort.   
In each age cohort, if the estimated median AUC based on the observed PK data in a subset of 
subjects on Day 5 PK assessment is less than 1.5-fold the median AUC from the simulated 
subject population profiles (over-exposure and under-exposure), the enrollment of subjects in the 
corresponding age cohort will continue and enrollment in the next younger age cohort can begin.   
3.3. 
End of Study 
This event driven study will continue until approximately 68 primary efficacy endpoints are 
achieved during the first 3-month treatment period.  Events occur across both treatment groups 
for the mITT analysis set (the mITT analysis set includes all symptomatic recurrent VTE, death 
as result of VTE, and no change or extension of thrombotic burden) during the first 3-month 
treatment period anytime from randomization through the final Month 3 visit (for Cohort 5, the 
intended duration of treatment is 6-12 weeks) in all randomized subjects who receive at least one 
dose of randomized study drug).  The number of cumulative events will be closely monitored 
and further randomization of subjects will be stopped when the required number of events is 
projected to be reached (End of Randomization date).  Based on the End of Randomization date 
a global End of Treatment (EOT) date will be established that ensures a minimum of 3 months of 
treatment for the last subject(s) randomized to study.  All subjects must permanently discontinue 
study treatment on or before the EOT date.  A final Follow-Up Visit date will be set one month 
following the EOT date.  All subjects must complete their follow-up safety visit and permanently 
discontinue study on or before the Follow-Up Visit date.  All subjects that discontinue treatment 
at Month 3 or earlier (for Cohort 5, the intended duration of treatment is 6 to12 weeks) based on 
EOT will be placed on SOC at Investigator discretion.  All suspected recurrent events will be 
evaluated by the CEC.  Adjudicated results will be the basis for the final analyses. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 45 
4. 
STUDY POPULATION 
4.1. 
Inclusion Criteria 
Subjects must satisfy all of the following criteria to be included in the study: 
1. Male or female pediatric subjects between birth (defined as 38 weeks gestational age) and 
less than 18 years of age at the time of consent. 
2. Pediatric subjects with the presence of documented VTE confirmed by appropriate 
diagnostic imaging and requiring anticoagulant therapy for at least 90 days (list of VTE 
provided in Section 7.1). 
-Subjects <6 months old (Cohort 5) with the presence of documented VTE confirmed 
by appropriate diagnostic imaging and requiring anticoagulant therapy for at least 6 to 
12 weeks. 
3. Subjects must have received at least 5 days of heparin (LMWH or SP Xa inhibitors or 
UFH according to the edoxaban label for VTE treatment) therapy prior to randomization 
to treat the newly identified index VTE.  In addition, prior to being randomized to 
edoxaban or SOC, subjects initially treated with VKA are recommended to have an INR 
≤2.5. 
4. Subject and/or parent(s)/legal guardian(s) or legally acceptable representative is informed 
and provides signed consent for the child to participate in the study with edoxaban 
treatment.  Pediatric subjects with appropriate intellectual maturity will be required to 
sign an assent form in addition to the signed informed consent from the parent(s)/legal 
guardian(s) or any legally acceptable representative. 
5. Female subjects who have menarche must test negative for pregnancy at Screening and 
must consent to avoid becoming pregnant by using an approved contraception method 
throughout the study Appendix 17.3.  
4.2. 
Exclusion Criteria 
Subjects who meet any of the following criteria will be disqualified from entering the study: 
1. Subjects with active bleeding or high risk of bleeding contraindicating treatment with 
LMWH, SP Xa inhibitors, VKAs, or direct oral anticoagulants (DOACs; identified high 
risk of bleeding during prior experimental administration of DOACs). 
2. Subjects who have been or are being treated with thrombolytic agents, thrombectomy or 
insertion of a caval filter for the newly identified index VTE. 
3. Administration of antiplatelet therapy is contraindicated in both arms except for low dose 
aspirin defined as 1-5 mg/kg/day with maximum of 100 mg/day (see Appendix 17.4.1). 
4. Administration of rifampin is prohibited during the study and subjects on concomitant 
use of rifampin are excluded. 
5. a) Subjects with severe hepatic impairment or hepatic disease associated with 
coagulopathy (eg, acute hepatitis, chronic active hepatitis, and cirrhosis).  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 46 
b) Subjects with ALT >5 × the upper limit of normal (ULN) or total bilirubin >2 × ULN 
with direct bilirubin >20% of the total at Screening.   
c) Subjects with aPTT >50 seconds or international normalized ratio [INR] >2.0 not 
related to anticoagulation therapy). 
6. Subjects with estimated glomerular filtration rate (eGFR) <30% of normal for age and 
size (see Appendix 17.7).  
7. Subjects with stage 2 hypertension defined as blood pressure (BP) systolic and/or 
diastolic confirmed >99th percentile + 5 mmHg (see Appendix 17.8). 
8. Subject with thrombocytopenia <50 × 109/L at Screening Visit.  Subjects with a history 
of heparin-induced thrombocytopenia may be enrolled in the study at the Investigator’s 
discretion. 
9. Life expectancy less than the expected study treatment duration (3 months). 
10. Subjects who are known to be pregnant or breastfeeding. 
11. Subjects with any condition that, as judged by the Investigator, would place the subject at 
increased risk of harm if he/she participated in the study including contraindicated 
medications identified in Appendix 17.4.  
12. Subjects who participated in another interventional clinical study or were treated with an 
experimental therapy with less than a 30 day wash-out period prior to identifying the 
qualifying index VTE. 
13. Hypersensitivity to the active ingredient or to any of the excipients of any components of 
the trial treatment. 
14. Patients with a history of thrombosis who are diagnosed with antiphospholipid syndrome 
who are triple positive (for lupus anticoagulant, anticardiolipin antibodies, and anti-beta 
2-glycoprotein I antibodies). 
4.3. 
Additional Requirements 
4.3.1. 
Stopping Rules for Age-based cohort during PK/PD assessment:  
 In each age cohort if the estimated edoxaban median AUC based on the observed PK 
data in the approximately 12 subjects (between 5 and 12 subjects in Cohort 5) on Day 
5 PK assessment is 50% higher or 50% lower than the median AUC from the 
simulated patient population profiles, dose reevaluations for Phase 3 subjects will be 
recommended to achieve the exposure comparable to adult 60 mg doses.  The 
enrollment of subjects in the corresponding age cohort will be put on hold until 
reevaluation of the dose for this age cohort.   

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 47 
4.3.2. 
Stopping Rules for Study: 
An IDMC may recommend termination of the study.  Termination may be made for any of the 
following reasons: 
 Concern about significantly higher bleeding risk relative to one of the study arms, 
 Concern about drug-induced liver injury, 
 Any other safety concern based on benefit/risk evaluation. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 48 
5. 
STUDY TREATMENT(S) 
5.1. 
Assigning Subjects to Treatments and Blinding 
5.1.1. 
Treatment Group(s) 
All subjects will be assessed for eligibility in the study in accordance with the 
inclusion/exclusion criteria after VTE diagnosis.  Eligible subjects will be stratified by age and 
region (ie, US/Canada, Europe, Asia/Pacific, and Rest of the World), and then randomized in a 
1:1 ratio to the edoxaban treatment arm or the SOC treatment arm, respectively. 
Study treatment should be administered on the same day as randomization (Day 1).  Subjects 
randomized to edoxaban and previously treated with VKA, can initiate edoxaban treatment only 
after the INR is ≤2.5; or 12 hours after last dose of LMWH.  
The Day 5 PK/PD assessment will be adjusted accordingly to have 5 doses of edoxaban prior to 
assessment.  For subjects participating in PK/PD assessment and receiving LMWH twice a day 
and who already received a morning dose on Day 1 prior to randomization, edoxaban can be 
started on the morning of Day 2 (12 hours ± 3 hours after last evening dose of LMWH). 
Initial treatment with heparin (with overlapping VKAs if needed) for index VTE prior to 
randomization must be  within the range of at least 5 - 15 days  and up to  20 days with Sponsor 
approval.  In addition, prior to being randomized to edoxaban or SOC, subjects initially treated 
with VKA should have an INR ≤2.5. 
5.1.1.1. 
Edoxaban Treatment Arm 
Edoxaban treatment will be dispensed to the subject on a monthly visit schedule.  After Month 3 
the distribution of edoxaban may be for a 3-month period to align with the visit schedule, with 
the Sponsor’s approval.  Edoxaban will be started orally at the age/weight/renal function 
appropriate dose (depending on the results of the ongoing U157 study) for the Treatment Period.   
5.1.1.1.1. Edoxaban dose recommended for 12 to <18 years old pediatric subjects  
Edoxaban treatment will be dispensed to the subject on a monthly visit schedule (see caveat 
above).  The oldest cohort (12 to <18 years old) will receive tablets (15 and/or 30 mg strength, 
see Table 5.1).  (Doses for all subsequent age cohorts will be by notification to the investigative 
sites.)  Subjects will be instructed to take edoxaban (tablets) orally once a day, at the same time 
every day, with or without food.  Tablets should be swallowed with a glass of water. 
Only on Day 5 (+3), the approximately first 12 subjects participating in PK/PD assessment 
should be fasting one hour prior to intake of edoxaban dose and a maximum of 2 hours after 
taking edoxaban dose. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 49 
Table 5.1: 
Edoxaban Dose Recommended For All 5 Cohorts (12 to <18 years, 6 to <12 
years, 2 to <6 years, 6 months to <2 years, and birth to <6 months)   
Age 
Body Weight 
Dose 
(Tablet) 
Dose (Suspension) 
(6 mg/mL 
concentration)c,e  
Dose Reductiona 
12 to <18 yearsb 
(At date of consent) 
≥60 kg 
60 mg QD 
NA 
45 mg QD 
≥30 and <60 kg 
45 mg QD 
NA 
30 mg QD 
<5th Percentile 
for Agec 
30 mg QD 
NA 
NA 
6 to <12 years  
(At date of consent) 
<60 kg 
Dosed based on 
mg/kgd 
NA 
1.2 mg/kg with a 
maximum dose of 
45 mg 
0.8 mg/kg, with a 
maximum dose of 
45 mg 
2 to <6 years 
(At date of consent) 
Dosed based on 
mg/kg 
NA 
1.4 mg/kg with a 
maximum dose of 45 
mg 
0.7 mg/kg, with a 
maximum dose of 
24 mg 
6 months to <2 years 
(At date of consent) 
Dosed based on 
mg/kg 
NA 
1.5 mg/kg with a 
maximum dose of 45 
mg 
0.75 mg/kg with a 
maximum dose of 
24 mg 
>28 days to <6 
months 
(At date of consent) 
Dosed based on 
mg/kg 
NA 
0.8 mg/kg with a 
maximum dose of 12 
mg/kg 
0.4 mg/kg, with a 
maximum dose of 
6 mg/kg 
38 weeks gestation to  
≤28 days 
(At date of consent) 
Dosed based on 
mg/kg 
NA 
To be determined by 
the IDMC 
0.4 f mg/kg,with a 
maximum dose of 
6 mg/kg 
Abbreviations: eGFR = estimated glomerular filtration rate; IDMC = Independent Data Monitoring Committee; 
NA = not applicable; P-gp = P-glycoprotein; QD = once a day 
a Conditions for dose reduction: 
If a subject requires concomitant administration of P-gp inhibitor (Appendix 17.4.6), the edoxaban dose will be 
reduced during P-gp administration and re-established to the original dose once P-gp inhibitor administration 
had concluded.  
Edoxaban dosage regimen will be reduced permanently for subjects with moderate renal impairment for the 
subject’s age and size at randomization as determined by the age appropriate formula: Cockcroft-Gault 
equation for pediatric subjects ≥12 years of age and modified Schwartz equation for pediatric subjects 
<12 years of age).  Refer to Appendix 17.7 for eGFR values below which dose reduction should be 
implemented.   
If a subject experiences a change in renal function from normal to eGFR ≥30% to ≤50% after 
randomization, the measurement will be repeated within 1 week to 10 days after correction of the 
underlying factor’s causing pre-azotemia.  If the repeat measurement confirms the reduced eGFR, the 
edoxaban dose reduction will be permanent even if the subject experiences an improvement in the eGFR 
during the course of the study. 
b Dose reduction due to body weight applies only for fixed doses in subjects 12 to <18 years of age: 
If body weight increases or decreases from the categories of weight defined at consent, the subject will be 
dose adjusted.  Subjects who are ≥60 kg of body weight at consent and drop below that body weight will 
receive 45 mg dose at any subsequent visit.  Subjects who are ≥30 and <60 kg at consent and increase 
their weight to ≥60 kg will increase their dose to 60 mg. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 50 
c Edoxaban dosage regimen will be reduced permanently for subject with body weight <5th percentile for age.  
Refer to Appendix 17.9. 
d Edoxaban granulation will be diluted with 8 mL water to provide a concentration of 6 mg/mL dosing suspension. 
 If body weight increases or decreases from the categories of weight defined at consent, the subject will be dose 
adjusted.  Subjects who are ≥60 kg of body weight at consent and drop below that body weight will receive 45 
mg dose at any subsequent visit.  Subjects ≥30 and <60 kg at consent increasing their weight to ≥60 kg will 
increase their dose to 60 mg. 
Note: Dose is based upon weight at corresponding visit. 
e Edoxaban granules are for subjects <12 years of age only.  Subjects 12 to <18 years of age should use crushed 
edoxaban tablets. For those subjects cannot swallow whole tablets, edoxaban tablets may be crushed and mixed 
with 2 to 3 ounces of water and immediately administered by mouth or through a gastric tube.  The crushed tablets 
may also be mixed into applesauce and immediately administered.. 
f The IDMC may meet and conclude that subjects ≤28 days old no longer require a dose reduction and may 
recommend a revised dose based on the availability and re-review of PK data. 
5.1.1.1.2. Edoxaban dose recommended for <12 years old pediatric subjects 
Subjects of age <2 years will have dose recommendations based on the PK and safety data from 
same age cohort in U157 study and subjects evaluated for edoxaban exposure in the previous 
older cohort in U312 study.  The PK and safety data will be reviewed by the IDMC (Section 
15.9) who will approve the start of the next younger age cohort.  Based on the IDMC review of 
Cohort 1 data from DU176b-D-U312 and corresponding cohort data from study DU176b-A-
U157, the proposed dose that was safe and effective for VTE treatment was 1.2 mg/kg body 
weight for Cohort 2 (6 to <12 years) (Table 5.1), 1.4 mg/kg body weight for Cohort 3 (2 to <6 
years), 1.5 mg/kg, for Cohort 4 (6 months to <2 years), 0.8mg/kg for Cohort 5 (>28 days to <6 
months), and will be determined by the IDMC for Cohort 5 (38 weeks gestation to  ≤28 days).   
Doses for all subsequent age cohorts will be made by separate notifications to the investigative 
sites, outside the content of this protocol, and after the IDMC has approved the proposed 
edoxaban doses.  An official notification will be sent when select age cohorts can begin 
randomization to either SOC or edoxaban treatment.  In addition, a notification will indicate that 
Day 5 PK/PD edoxaban exposure evaluation will no longer be necessary for future subjects 
randomized to edoxaban in the corresponding age cohort.  
Subjects of age <12 years will receive edoxaban granules for oral suspension (60 mg) and will be 
dosed on an mg/kg basis. Check the body weight prior to dosing and adjust dosage accordingly.  
Frequency of dosage changing is up to the Investigator’s discretion, but the maximum dose 
would not exceed 45 mg once a day (QD). 
5.1.1.2. 
Standard of Care Treatment Arm 
SOC treatment will be dispensed to the subject on a monthly visit schedule.  After Month 3, the 
distribution of SOC may be for a 3-month period to align with the visit schedule, with the 
Sponsor’s approval.  Subjects will receive SOC anticoagulant according to the site’s SOC 
treatment, as follows (alone or combination): 
 LMWH (alone or followed with VKA) 
 SP Xa inhibitors (alone or followed with VKA) 
 Vitamin K antagonist (VKA) 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 51 
In case of centrally sourced SOC treatment, the Sponsor will only provide enoxaparin as 
LMWH, fondaparinux as SP Xa inhibitor, or warfarin as VKA with limited presentations.  The 
subject will be treated with enoxaparin or fondaparinux or warfarin/heparin, with the following 
suggestion:  
 Enoxaparin – Subjects will be treated with enoxaparin alone or can be switched to 
warfarin anytime during the study treatment period.  Single dose (pre-filled syringe) 
or as multiple dose vials (for subjects <10 kg) for injection where allowed per 
standard clinical practice will be provided to the subject.  Initial treatment age-
dependent dose of enoxaparin: 
 Age <2 months: 1.5 mg/kg dose twice a day 
 Age ≥2 months: 1.0 mg/kg dose twice a day 
 Fondaparinux – Subjects will be treated with fondaparinux alone or can be switched 
to warfarin anytime during the study treatment period. 
 Dosing of 0.1 mg/kg/day (0.05 mg/kg/day for subjects with renal disease). 
 If the appropriate required dose cannot be administered with the pre-filled 
syringes, the site should consider using alternative SOC treatment options. 
 Warfarin will be started on Day 1.  Heparin will be discontinued when INR ≥2.0 and 
≤3.0 for 2 consecutive measurements obtained at least 24 to 48 hours apart.  The 
subject will continue warfarin treatment for the remainder of the study treatment 
period. 
 Additional information on dosing and dose adjustment (Appendix 17.2) 
5.1.2. 
Method of Treatment Allocation 
Eligible subjects will be stratified by  
1. Age (12 to <18 years of age; 6 to <12 years of age; 2 to <6 years of age; 6 months of age 
to <2 years of age; birth to <6 months of age)  
2. Regions (ie US/Canada, Europe, Asia/Pacific and Rest of the World).  Additional regions 
may be included if needed)  
An independent biostatistician will generate the randomization schedule in accordance with the 
operating procedure for allocating study drug.   
At randomization, the Investigator provides the IXRS with the study center number; the subject’s 
presenting diagnosis (symptomatic VTE) and date of birth.  Dose reduction stratification will 
take into account for: 
 eGFR is 30-50% of normal for age and size (Appendix 17.7). 
 Whether the subject is receiving concomitant treatment with P-gp inhibitors 
(Appendix 17.4.6). 
 For all subject: whether body weight <5th percentile of subject’s age (see 
Appendix 17.9). 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 52 
The IXRS will assign the unique subject identification number, allocate the treatment group 
assignment for the subject and provide the appropriate drug supply kit number(s), for edoxaban 
and centrally sourced SOC. 
A fax or e-mail will be sent by the IXRS to provide the appropriate drug supply kit number(s).  
The fax or e-mail will also provide a calendar with dates of subsequent prescheduled visits and 
drug resupply. 
5.1.3. 
Blinding 
Not applicable. 
5.1.4. 
Emergency Unblinding Procedure 
Not applicable. 
5.2. 
Study Drug(s) 
5.2.1. 
Description 
The investigational medicinal products (IMP) for this study are edoxaban (DU-176b) and SOC 
anticoagulants (LMWH, SP Xa inhibitor and VKA). 
Edoxaban will be supplied as a one month treatment interval as tablets (15 and/or 30 mg 
strength) or granules for oral suspension 60 mg. Subjects will be instructed to take edoxaban 
(tablets or granules) orally once a day, at the same time every day, with or without food.  Tablets 
should be swallowed with a glass of water.  
 60 mg dose will be dispensed with two 30 mg tablets 
 45 mg dose will be dispensed with one 30 mg tablet plus one 15 mg tablet 
 30 mg dose will be dispensed with one 30 mg tablet 
The SOC drugs will be supplied as a one month treatment interval sourced locally by the 
Investigator or centrally by the Sponsor.  
If local sourcing is used, the Investigator is allowed to utilize LMWH, VKA, or SP Xa inhibitors 
according to the site SOC treatment (no strength restrictions).  
If central sourcing is used only enoxaparin as LMWH, fondaparinux as SP Xa inhibitor, and 
warfarin as VKA will be provided by the Sponsor at fixed doses. 
The Sponsor will provide SOC treatment as follows: 
 Enoxaparin (LMWH) will be provided to the subjects as solution for SC injection in 
pre-filled syringes with 60 mg/0.6 mL, 80 mg/0.8 mL, and 100 mg/1.0 mL 
concentration for injection, or as multiple dose vials (for subjects <10 kg) for 
injection where allowed per standard clinical practice.  Guidance on dosing and 
dispensing is provided in Appendix 17.2.   
 Fondaparinux (SP Xa inhibitor) will be supplied as solution for SC injection in pre-
filled syringes (2.5 mg/0.5 mL, 5.0 mg/0.4 mL, 7.5 mg/0.6 mL, 10.0 mg/0.8 mL and 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 53 
where available 1.5 mg/0.3 mL).  Guidance on dosing and dispensing is provided in 
Appendix 17.2. 
 Warfarin (VKA) will be supplied as tablets (0.5 mg, 1.0 mg, and 3.0 mg). Various 
doses will be available for INR maintenance in the therapeutic range of ≥2.0 and 
≤3.0.  Guidance on dosing and dispensing is provided in Appendix 17.2. 
5.2.2. 
Labeling and Packaging 
Investigational products will be provided in adequate quantity for study conduct and labeled in 
an open-label format.  Investigational product labels will include all information required by 
federal and local regulations. 
Edoxaban 15, 30 mg tablets will be supplied by Sponsor in an open-label format.  The edoxaban 
granules for oral suspension 60 mg will be provided in glass bottles, as per visit schedule, for 
single dose application. 
Centrally sourced SOC will be presented in its commercial presentation with clinical study over 
label.  It will include information required by federal and local regulations. 
5.2.3. 
Preparation 
No special preparation will be required for the tablet formulation.  However, if a subject does not 
have the capacity to swallow tablets in the 12 to <18 year old group, the tablets may be crushed 
and served with applesauce or mixed with 2 to 3 ounces of water and immediately administered 
by mouth or through a gastric tube. 
The edoxaban granules for oral suspension 60 mg will be provided in amber glass bottles (wide 
neck) with white polypropylene caps.  The edoxaban granules for oral suspension 60 mg 
formulation will be reconstituted with 8 mL of water to provide a 6 mg/mL liquid suspension.  
Doses provided by the granulation formulation will be dispensed with an oral dosing syringe 
according to the recommended doses for the age cohort.  Instructions for reconstitution and 
syringes will be provided to the Investigator/designee. 
No special preparation will be required for centrally sourced SOC. Instructions for daily use will 
be provided to the Investigator/designee. 
5.2.4. 
Administration 
Study drug will be dispensed to the subject on a monthly visit schedule.  Note in Table 17.1, 
each monthly dispense visit is not indicated because no additional procedures are expected at that 
visit.  After Month 3 the distribution of SOC may be for a 3-month period to align with the visit 
schedule, with the Sponsor’s approval. 
The study drugs will be shipped to the study sites, and the Investigator/designee will be 
responsible for dispensing the study drugs.  The Investigator/designee will provide the subjects 
with product in sufficient quantity, plus overage, via IXRS dispensing, for Edoxaban and 
centrally sourced SOC until the next scheduled visit.  The Investigator/designee will also instruct 
the subject on reporting study drug administration and accountability.  Subjects who miss one 
dose of study drug will be instructed to take the next dose as their drug administration schedule. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 54 
5.2.4.1. 
Instruct the subject to begin taking edoxaban  
LMWH / SP Xa inhibitors / UFH (with overlapping VKAs if needed) treatment during Pre-
randomization must be discontinued at Randomization day (Day 1).  Edoxaban dosing should 
begin when INR is ≤2.5 for warfarin-treated subjects.  For subjects participating in PK/PD 
assessment and receiving LMWH twice a day and who already received morning dose on Day 1 
prior to randomization, edoxaban can be started on the morning of Day 2 (12 hours ± 3 hours 
after last evening dose of LMWH). 
1. A subject who was on LMWH twice a day regimen will start edoxaban dosing 
12 ± 3 hours after the last LMWH dose 
2. A subject who was LMWH QD regimen or on SP Xa inhibitors (once daily) will start 
edoxaban dosing 24 ± 3 hours after the last LMWH or SP Xa inhibitor dose 
3. A subject who was on an UFH regimen will start edoxaban dosing 4 ± 1 hour after the 
last UFH dose 
4. A subject who had received VKA during the Screening period, VKA should be stopped 
24 hours prior to randomization (INR should be ≤2.5 in the absence of VKA therapeutic 
effect).  Subject can take edoxaban on the day of randomization.  
5.2.4.2. 
Instruct the subject randomized to SOC treatment  
Subjects randomized to SOC treatment arm will receive SOC anticoagulant according to the 
study site’s SOC treatment as follows (alone or combination): 
 LMWH (alone or followed with VKA) 
 SP Xa inhibitors (alone or followed with VKA) 
 Vitamin K antagonist (VKA) 
If Investigators choose to use centrally sourced SOC treatment from Sponsor, the subject will be 
treated as follows:  
 For subjects randomized to enoxaparin: for neonates or children receiving either 
once- or twice-daily therapeutic enoxaparin the drug should be monitored to a target 
anti-FXa level of 0.5 to 1.0 units/mL in a sample taken at 4 hours post-dose for 
therapeutic levels.  Monthly monitoring of anti-FXa levels is recommended.  More 
frequent anti-FXa levels can be recommended as per Investigator’s decision.  
 For subjects randomized to fondaparinux: dosing of 0.1 mg/kg/day (0.05 mg/kg/day 
for subjects with renal disease).  Monitoring fondaparinux levels (0.5- 1 mg/L) can be 
recommended as per Investigator’s decision.  
 For subjects randomized to warfarin: the dose should be titrated to achieve a target 
INR of 2.5 (≥2.0 and ≤3.0).  Visits will be at the discretion of the Investigator and 
captured as unscheduled visits for data collection.  Adjustment of the maintenance 
dose of VKA will be dependent on INR monitoring as follows:  
 INR = 2.0 to 3.0, no change in dose 
 INR = 1.1 to 1.4, increase dose by 20% 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 55 
 INR = 1.5 to 1.9, increase dose by 10% 
 INR = 3.1 to 3.5, decrease dose by 10% 
 INR >3.5, hold VKA until INR is <3.5, then decrease dose by 20% when 
restarted.  
To initiate SOC post screening, it is recommended to test infants and children every 4 
weeks once a stable dose of VKA has been achieved.  However, depending on the 
site’s clinical practice and PI’s discretion, the subjects can be tested at the physician’s 
discretion and/or according to local practice.  More frequent INR testing is 
recommended in infants and children receiving VKA with any change in diet or 
medication or when an illness occurs.  An unscheduled visit will need to be 
performed to document the discretionary INR measurement and potential VKA 
dosage change as an unscheduled visit day. 
If a therapeutic INR (≥2.0 on 2 separate measurements at least 24-48 hours apart or a 
single supratherapeutic INR >3.0) is not achieved within 12 days (by Day 12) after 
starting LMWH and warfarin, the Investigator may be contacted by a study physician 
for discussion and guidance. 
Guidance on dosing and dispensing is provided in Appendix 17.2. 
5.2.5. 
Storage 
Edoxaban tablets and granules for oral suspension must be stored at 20° to 25°C (68° to 77°F) 
with excursions permitted to 15° to 30°C (59° to 86°F).   
SOC treatments must be stored as per labeled storage conditions. 
All drug supplies must be stored in a secure, limited access storage area under the recommended 
storage conditions.  If storage conditions go outside of allowable excursions, Sponsor/Contract 
Research Organization (CRO) must be contacted.  The excursions will be discussed with the 
Sponsor and CRO to determine what action is necessary.  
Recordings of storage temperature (eg, via the uses of a maximum/minimum thermometer) must 
be made.  Temperature measurements will be recorded on a temperature log excluding weekends 
and holidays. 
5.2.6. 
Drug Accountability 
For Sponsor provided edoxaban or SOC upon receipt, the Investigator/designee will confirm the 
amount and condition of the drug, confirm the appropriate local language in the label, drug 
expiration date, confirm Temperature monitor readings and sign the Receipt of Shipment Form 
provided.  The Receipt of Shipment Form should be returned as instructed on the form.  The 
original will be retained at the study center.  In addition, the Investigator/designee shall contact 
Sponsor as soon as possible if there is a problem with the shipment and quarantine the shipment 
until resolution is obtained from the Sponsor. 
For both locally sourced SOC and Sponsor provided study therapy a Drug Accountability Record 
will be used for the products.  It may be provided by the Sponsor/Sponsor representative, or the 
site may use a Sponsor Approved Form.  The record must be kept current and must contain the 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 56 
dates and quantities of drug received from central supply (for Sponsor provided therapy), 
subjects for whom the products was dispensed (identification number and/or initials or supply 
number as applicable), the date and quantity of IMP dispensed and remaining, if from individual 
subject drug units, as well as the initials of the dispenser.  Edoxaban and centrally sourced SOC 
must additionally be accounted for and reconciled in IXRS.  All unused drug and containers 
whether provided by the sponsor or provided locally must be brought back to the study site for 
accountability to reinforce appropriate dosing instructions to the subject. 
At the end of the study, or as directed, all products, including unused, partially used, or empty 
containers, will be destroyed, after full accountability.  If drug destruction occurs at the study 
center, this must be approved in writing by the Sponsor and the Sponsor has received copies of 
the study center’s drug handling and disposition standard operating procedures (SOPs).  Locally 
sourced SOC should be destroyed locally.  (Local destruction is preferred method of destruction, 
compared to return for depot destruction.) 
For Sponsor provided and locally supplied drug, dosage form (ie, tablet, granule bottles, and 
syringes) site level accountability documentation is required as part of the disposition records of 
IP.  The dosage form site level accountability documentation should be appended to the 
Certificate of Destruction, if available. 
The IMP will only be returned to a designee as instructed by the Sponsor if the study center is 
unable to perform the products destruction.  Investigational product will be returned only after 
the study monitor has completed a final inventory to verify the quantity to be returned.  The 
return/destruction of products must be documented.  At the end of the study, a final product 
reconciliation statement must be completed by the Investigator/designee and provided to the 
Sponsor.  
Dosage form (ie, tablet, granule bottles, and syringes) site level accountability documentation is 
to be included with each drug supply return shipment (or other returning facility, such as another 
depot).  This is required as part of the receiving records for return shipments. 
All inventory forms must be made available for inspection by a Sponsor-authorized 
representative or designee and regulatory agency inspectors.  The Investigator is responsible for 
the accountability of all used and unused study supplies at the study center. 
5.3. 
Dose Interruptions and Reductions 
If a subject’s treatment with study drug must be interrupted for medical or surgical reasons (eg, 
hospital admission for an invasive procedure, a major medical condition, surgery, 
thrombocytopenia due to cytotoxic medication, or dental work); use of a prohibited concomitant 
medication; or other reasons (eg, temporary situation that prevents subject adherence with the 
study drug administration schedule, etc.), the subject’s study drug should be resumed as early as 
the situation allows.  Edoxaban should be discontinued for 24 hours prior to the initiation of the 
procedures (depending on PK/PD data in children).  Subjects should be encouraged to restart 
study drug after an interruption except when absolutely contraindicated.  The duration of study 
drug interruption can vary depending upon the individual circumstances, and study drug may be 
resumed regardless of the duration of time that it had been interrupted.  Any subject who 
temporarily interrupts study drug for more than 3 days will have the reason recorded in the 
electronic case report form (eCRF). 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 57 
5.3.1. 
Edoxaban Dose Reduction 
During the treatment period, a subject may reduce the dose of edoxaban for any of the following 
reasons (Table 5.1): 
 eGFR is 30-50% of normal for age and size (Appendix 17.7). 
 Subject is receiving concomitant treatment with P-gp inhibitors. 
 Body weight <5th percentile of subject’s age (see Appendix 17.9). 
 Subject is ≤28 days old (corrected for gestation age of 38 weeks). This may change 
based on the IDMC recommendation. 
For subjects receiving P-gp inhibitors, the dose of edoxaban will only be reduced during the 
administration of the concomitant P-gp inhibitor.  Subjects experiencing eGFR or body weight 
reduction will maintain their reduced edoxaban dose for the duration of the study.  Once the 
subject turns >28 days old, the dose may be increased to 0.8 mg/kg. 
5.4. 
Method of Assessing Treatment Compliance 
Dosing compliance for subjects in the edoxaban treatment arm will be assessed by means of 
tablet/bottle counts remaining or bottles returned.  All drug packaging will be returned at each 
subject visit and will be accountable including bottles with dilutions made for dosing.  
Administration of the IMP will be recorded in the case report form (CRF)/eCRF/Drug 
Accountability Record.  As necessary, include method of compliance calculation based on the 
returned number of tablets/bottles.  If zero tablets/bottles returned, ask subject whether any were 
disposed/thrown away, rather than taken orally. 
Subjects in the SOC (VKA) treatment arm will be monitored for compliance by measuring INR 
levels.  Subjects in the SOC (enoxaparin) treatment arm will be monitored for compliance by 
measuring anti-FXa levels.  Subjects in the SOC (fondaparinux) treatment arm will be monitored 
for compliance by measuring fondaparinux levels.  These results will be entered into electronic 
data capture (EDC) system. 
5.5. 
Prior and Concomitant Medications 
Medications that the subject has taken within 30 days before randomization will be recorded. 
There are no concomitant medications required as part of the study design.  The following drugs 
and devices (see Appendix 17.4 ) CANNOT be used during the entire study treatment period and 
their unavoidable use would require study drug therapy interruption unless specifically indicated 
for study drug discontinuation: 
 Anticoagulants, other than the assigned study drugs, by any route – study drug 
discontinuation 
 Fibrinolytic agents, if required to treat thromboembolism events, require study drug 
discontinuation and consideration of a transfusion of fresh frozen plasma; 
 Single or dual antiplatelet therapy with any antiplatelet agent is prohibited except for 
low dose aspirin defined as 1-5 mg/kg/day with maximum of 100 mg/day.  If a 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 58 
clinical indication for antiplatelet therapy (other than low dose aspirin) arises after 
randomization, study drug should be discontinued.  
 Chronic use of oral or parenteral NSAIDs including both cyclooxygenase-1 (COX-1) 
and cyclooxygenase-2 (COX-2) inhibitors other than aspirin for ≥4 days/week.  Use 
of NSAIDs via other routes (eg, topical, inhaled, intranasal, intraocular, etc.) are not 
restricted (see Appendix 17.4.5). 
All P-gp inhibitors (please refer to Appendix 17.4.6 for an example list of most commonly used 
P-gp inhibitors) excluding amiodarone will require dose reduction of edoxaban.  
The Investigator is encouraged to contact a study physician (telephone number will be provided 
per country, per region; please refer to Study Manual for an appropriate phone number) if further 
guidance is needed. 
Information regarding concomitant medications will be collected with start date, stop date, drug 
name, dose and dosing regimen for population PK analyses. 
5.6. 
Subject Withdrawal or Discontinuation 
Any subject who discontinues from the study treatment for any reason will have their study 
treatment discontinuation recorded.  A subject may discontinue study treatment during the Main 
Treatment Period, however the subject should still remain as a study participant for scheduled 
visits through Month 3 (Visit 5) and the subsequent 30-day safety Follow-Up Visit.  
Follow-Up Visit (visit 9) regardless if they stop all anticoagulant therapy or are placed on a 
treatment they have not been assigned at randomization.  If a subject discontinues from treatment 
after Month 3, they should also be discontinued from the study and have a subsequent 30-day 
Follow-Up Visit. 
5.6.1. 
Discontinuation from Treatment within the Main Treatment Period (Month 3) 
Early discontinuation of study drug is discouraged.  However if, in the Investigator’s opinion, 
continuation of study drug would be detrimental to the subject’s well-being or in specific clinical 
situations (eg, liver function test disturbances, severe renal insufficiency, recurrent VTE, 
bleeding), the study drug can be stopped permanently.  Subjects who discontinue treatment 
during the Main Treatment Period should return to the clinical site per the study procedure 
schedule (Table 17.1) for all remaining safety and efficacy assessments through the scheduled 
Month 3 visit (Visit 5) regardless of what treatment, if any, they may subsequently be taking.  A 
30-day Follow-Up Visit (Visit 9) will be required for all subjects completing Month 3, regardless 
of discontinuation from treatment during the main treatment period.  If a subject discontinues 
study medication before Month 2, the follow up visit may be combined with Month 3 Visit. 
A telephone call for follow-up assessment may be conducted in exceptional circumstances when 
the subject is not able or willing to present to the study center.  
The reasons for discontinuation from treatment must be documented. 
If a subject discontinues study treatment prior to Month 3, the Investigator will complete and 
report the observations as thoroughly as possible at scheduled visits including the date of last 
treatment and the reason for discontinuation of study treatment through 3 months of observation.  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 59 
5.6.2. 
Discontinuation from Treatment and Study beyond Month 3 up to 12 Month 
During the extension period (beyond 3 months of treatment), all subjects who discontinue from 
the study treatment and the study during the extension period will return to the study center for a 
discontinuation visit (Visit 8) and 30 day Follow-Up Visit (Visit 9) after the discontinuation 
visit.  
Note: those subjects in the extension do not need to be followed through 12 months of study 
procedures and can be discontinued from treatment and study per Investigator discretion at any 
time with a discontinuation visit after Month 3.   
5.6.3. 
Reasons for Discontinuation of Study Treatment  
Subjects may discontinue the treatment for any of the following reasons 
1. End of requirement for anticoagulant therapy 
2. Reasons related to adverse events (AEs): 
 Initiating or continuing study drug places the subject at undue hazard as determined 
by the Investigator; 
 Serious adverse event (SAE) or other safety concern that is related to study drug 
treatment as determined by the Investigator; 
 Major bleeding event as determined by the Investigator; 
 Aggravation or new occurrence of renal insufficiency with eGFR ≤30% of normal for 
age and size; 
 Hepatic test abnormalities as follows: 
 Elevation of ALT and/or AST ≥3 × ULN and TBL ≥2 × ULN simultaneously.  
 ALT and/or AST ≥8 × ULN requires an immediate interruption of study drug 
treatment and prompt repeat testing to confirm abnormality.  
 Clinical jaundice requires an immediate interruption of study drug treatment and 
prompt repeat testing to confirm abnormality; 
 Any elevation of transaminases combined with clinical symptoms of liver injury;   
 If a subject discontinues study drug due to confirmed liver enzyme abnormalities or 
jaundice, the subject will have additional evaluations at the discretion of the 
Investigator as follows: 
 Hepatitis A, B, C, and E screening (anti-HAV IgM, HBsAg, anti-HCV plus viral 
titer, and evaluation for Hepatitis E); 
 Abdominal ultrasound; 
 Antinuclear antibody (ANA) and anti-SmAb; 
 Cytomegalovirus (CMV); 
 Epstein-Barr virus (EBV); 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 60 
 Additional evaluations as deemed appropriate by the Investigator to exclude other 
causes of liver enzyme and bilirubin elevations. 
Subject’s follow-up will be required on a weekly basis until the values (transaminases and 
total bilirubin) return to baseline or clinically acceptable levels in the judgment of the 
Investigator.  For the above laboratory blood tests, using the central laboratory is 
recommended.  However, if circumstances warrant the use of a local laboratory, copies of the 
local laboratory results will be required.  All clinically significant hepatic enzyme 
abnormalities and/or hepatic events are to be documented in the eCRF and prompt 
submission of the adjudication dossier should also occur for events that led to study drug 
discontinuation or were reported as SAEs. 
3. Unplanned cardiac surgery due to aggravation of cardiac conditions; 
4. Pregnancy;  
5. Study terminated by Sponsor; 
6. Protocol violation; 
7. Lack of efficacy. 
Those subjects extended beyond Month 3 (Visit 5) will have study procedures terminated at the 
time of discontinuation from study with a discontinuation visit with a subsequent 30-day safety 
Follow-Up Visit (Section 6.4.3).  
If the subject discontinued study treatment due to an AE, the Investigator will follow the subject 
until the AE has resolved or stabilized. 
5.6.4. 
Reasons for Withdrawal at any Time During the Study 
Withdrawal of a subject will only occur by definition if no additional protocol scheduled visits or 
Follow-Up Visit is possible.  The withdrawal definition is mostly appropriate for those cases that 
occur in the Main Treatment Period because of the requirement to continue subjects on 
scheduled visits even if they discontinue treatment prior to Month 3 (Visit 5).  If a subject 
withdraws after Month 3 this would be classified as a discontinuation from treatment and study.  
The cases appropriate for withdrawal during the Main Treatment Period are: 
 Withdrawal of subject consent by subject or legal guardian(s) 
 Death 
 Lost to follow-up (attempts should be made to not have any subject lost to follow-up) 
 AE that occurs during the Main Treatment Period that requires withdrawal. 
5.6.5. 
Discontinuation Procedures 
In accordance with the Declaration of Helsinki and other applicable regulations, a subject has the 
right to discontinue study treatment or withdraw consent for participation in the study at any time 
and for any reason without prejudice to his or her future medical care by the physician or at the 
institution. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 61 
While subjects are encouraged to complete all study evaluations, they may discontinue study 
treatment or withdraw from the study at any time and for any reason without penalty.  Every 
effort will be made to determine why any subject discontinues study treatment or withdraws 
from the study prematurely.  This information should be recorded.   
The most likely reasons for withdrawal are death, lost to follow-up or withdrawal of consent, or 
an AE in which case all subsequent visits will NOT be possible as stated in the protocol.  
All subjects who classify as discontinued from the study treatment with an ongoing AE must be 
followed until the event is resolved or deemed stable even if they are not willing to participate in 
the study any longer.  If a subject discontinues study treatment or withdraws after dosing, all data 
normally collected prior to study discharge should be collected at the time of discontinuation 
from study treatment or withdrawal, and at the scheduled visit of the study.  
In case of withdrawal, a genuine effort must be made to determine the reason(s) why a subject 
fails to return for the necessary visits.  If the subject is unreachable by telephone, a registered 
letter, at the minimum, should be sent to the subject requesting him/her to contact the study 
center. 
If a subject is withdrawn or discontinued from study treatment, the IXRS will be called by the 
study center to register the subject status.   
Please see suggested classification of discontinuation and withdrawal status in Table 5.2. 
Table 5.2: 
Classification of Discontinuation and Withdrawal Status for Subjects by 
Scheduled Visit 
 
Discontinue Treatment 
Discontinue Study 
Withdrawal 
Randomization through 
Month 3 
Eligible 
Not Eligible 
(Need to follow 
through Month 3 with 
Follow-Up Visit) 
Eligible 
(Assumes no 
additional visit is 
possible) 
Beyond Month 3 
through Month 12 
Eligible 
Eligible 
(A discontinuation 
study visit will be 
conducted with 
Follow-Up Visit) 
Not Eligible 
(Unless no 
discontinuation visit 
is possible) 
 
5.6.6. 
Follow-up Procedures 
A 30-day follow-up for safety assessment will be scheduled after the Month 3 visit for all 
subjects participating in the 3-month Main Treatment Period (for Cohort 5, the intended duration 
of treatment is 6-12 weeks). 
Subjects who extend toward 12 months of study treatment and decide to no longer participate 
will have a subsequent 30-day Follow-Up Visit after their discontinuation visit during the 
extension period.   

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 62 
A 30-day Follow-Up Visit may be performed with a phone call if the following conditions have 
NOT occurred: 
 An SAE was not experienced by the subject at the last visit or during the interval of 
time from the last visit to the Follow-Up Visit, 
 An event (recurrent VTE, or bleeds) was not experienced by the subject at the last 
visit or during the interval of time from the last visit to the Follow-Up Visit. 
5.6.6.1. 
Temporary Interruption of Study Drug 
If a subject’s treatment with study drug must be interrupted for medical or surgical reasons (eg, 
hospital admission for an invasive procedure, a major medical condition, surgery, 
thrombocytopenia due to cytotoxic medication, or dental work); use of a prohibited concomitant 
medication; or other reasons (eg, temporary situation that prevents subject adherence with the 
study drug administration schedule, etc.), the subject’s study drug should be resumed as early as 
the situation allows.  Edoxaban should be discontinued for 24 hours prior to the initiation of the 
procedures (depending on PK/PD data in children).  Subjects should be encouraged to restart 
study drug after an interruption except when absolutely contraindicated.  The duration of study 
drug interruption can vary depending upon the individual circumstances, and study drug may be 
resumed regardless of the duration of time that it had been interrupted.  Any subject who 
temporarily interrupts study drug for more than 3 days will have the reason recorded in the 
eCRF. 
5.6.6.2. 
Subject Re-Screening Procedures 
Re-screening (retesting of laboratory test results) is permitted only once for any subject with 
Sponsor approval who failed to meet eligibility criteria upon initial screening related to a specific 
inclusion/exclusion criteria.  If a subject needs to be re-screened for any time dependent module 
(ie, laboratory, vital signs, etc.), the Investigator will perform an unscheduled visit within 30 
days of the original Screening visit and the appropriate module will be used to accommodate 
new data that would make the subject eligible to be randomized.  The subject identification 
number will remain the same at the time of rescreening. 
The initial screening information and the reason why the subject is ineligible for the initial 
evaluation will be uploaded into the EDC system.  Re-screening of a subject may occur only 
once. If there is a failure to meet study entry criteria, the failed subject will be recorded in the 
Screening Log and EDC. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 63 
6. 
STUDY PROCEDURES 
Potential subjects will have the study risks and possible benefits explained to them, the ICF 
reviewed with them, and all questions answered for them.  Subjects will undergo procedures 
specific to study qualification (Section 6.1) only after the ICF is signed by the subject/or the 
subject’s legal representative, and age appropriate assent obtained from subjects capable of doing 
so.  Subjects who complete the screening period and are determined to be eligible for study 
participation per the inclusion and exclusion criteria will be randomized in a 1:1 ratio to either 
the edoxaban-treatment arm or the SOC-treatment arm.   
All subjects will undergo safety objectives evaluations at the EOT at Month 3 and at 30-days 
thereafter.  Subjects who participate in the Extension Period will undergo safety objectives 
evaluations (recurrent VTE events, bleeding events, or any other AEs) at Months 6, 9, and 12, 
and 30-days after cessation of treatment if treatment up to 12 months is required.  
The Schedule of Events for this study is provided in Appendix 17.1.  
6.1. 
Screening: Study Qualification (At least Day -5 to -1, Visit 1) 
Any protocol-specified study qualification procedures/tests not already done as part of routine 
care will be conducted only after the subject signs the ICF and before randomization.   
Note: A newly diagnosed VTE or diagnostic workup may have been performed prior to 
identifying the subject for the study and signing the consent. 
Prior to signing the ICF, potential subjects and their parent(s)/guardian(s) will have the study 
risks and benefits explained to them, the associated ICF and assent form if applicable will be 
reviewed, and all questions answered for them.  Written informed consent must be signed by the 
parent(s)/guardian(s) of all subjects, and assent obtained from the child, when and where 
applicable, prior to entry into the study.  
 It is anticipated that some subjects will have had some of the study qualification 
procedures done as part of routine care outside the auspices of this study (for 
example, diagnostic work-up and associated care for index VTE).  As long as these 
procedures were done for the newly diagnosed index VTE before randomization, they 
may be used to complete the Screening eCRF.  
 A Screening eCRF must be completed for every subject with a signed ICF.  Any 
protocol-specified study qualification procedures/tests not already done as part of 
routine care will need to be conducted after the parent(s)/guardian(s) signs the ICF 
and before randomization.  
 Register the subject for screening within IXRS Screening Visit and subject number 
will be provided. 
 For subjects who did not have any protocol-specified screening procedures done as 
part of routine care for the newly diagnosed index VTE before randomization, the 
following study qualification procedures must be completed to ensure that the subject 
is eligible for the study. 
 Review inclusion/exclusion criteria  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 64 
 VTE Radiologic Image: After index VTE diagnosis is confirmed through the 
appropriate imaging techniques (see Section 7.1) send the results to the Clinical 
Evaluation Committee for adjudication  
 Record demographic information (date of birth/age, sex, ethnicity, and race) 
 Record medical/surgical history, 
 Record prior medication (up to 30 days prior to screening)  
 Perform physical examination including:  
▪ Vital signs (BP, heart rate, and body temperature after resting in a sitting 
or supine position [Note: the appropriate cuff size base on arm 
circumference will be used.] see Section 9.9)  
▪ Height and body weight (may be performed by an Investigator or other 
healthcare provider designated by the Investigator).  
 Assess the subject for active bleeding, high risk for bleeding and any other 
contraindications for treatment with LMWH, or UFH, SP anti-FXa, VKAs or 
NOACs. 
 INR assessment and aPTT measurement to monitor coagulation for all subjects 
 Ensure that the subject qualifies with regard to the following laboratory tests for 
exclusion criteria: 
 Liver function assessments (ALT, AST, TBL, ALP)  
 Serum chemistry panel, Serum creatinine, and eGFR 
 Hematology 
 Urinalysis 
 Urine pregnancy test (for post-menarchal females) 
 Samples taken as part of routine care outside study auspices may be analyzed by local 
laboratories and the results used to qualify the subject provided the tests (INR, aPTT, 
ALT, TBL, eGFR and platelets) were performed for the newly diagnosed index VTE 
before randomization.  Alternatively, the central laboratory may be used for the above 
study qualification laboratory tests.  If central laboratory is also used at the same visit 
with a resulting discrepancy for exclusion criteria, the local laboratory result will still 
be used to qualify the subject. 
 Review concomitant medications for assessment of exclusion criteria. 
 Assess for and record AEs and concomitant medications. 
Full documentation for the above qualifying procedures and related results are required even if 
local laboratory results were used to qualify the subject. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 65 
6.1.1. 
Screening Period Prior to Randomization  
Initial treatment using LMWH or SP Xa inhibitor or UFH for index VTE prior to randomization 
must be within the range of 5 to 15 days and up to 20 days with Sponsor approval.  In addition, 
prior to being randomized to edoxaban or SOC, subjects initially treated with VKA are 
recommended to have an INR ≤2.5. 
6.2. 
Randomization (Day 1, Visit 2)  
If all procedures and tests done before randomization confirm the subject’s eligibility 
(Section 4.1) for the study, then the IXRS will be contacted to randomize the subject.  
Randomization may occur in IXRS the day prior to dosing for clinical logistics.  The following 
activities should be done at the time of randomization: 
 Record any prior medications used since the last visit.  
 Record any AEs since screening visit. 
 Urine pregnancy test (for post-menarchal females) 
 Dispense study drug and record amount (number of tablets/bottles) dispensed.  
Locally sourced SOC study therapy will need to be supported by a prescription 
identifying the type of SOC to be provided; 
 Explain the study medications and the proper daily dosing to the parent/guardian and 
subject (if applicable) using the study medication dosing calendar, and confirm that 
the subject understands the proper daily dosing of study medication. 
 Instruct subject to bring all medications including study drug packaging and bottles to 
each visit. 
Provide parent(s)/legal guardian(s) or legally acceptable representative parent(s)/guardian(s) and 
subject (if applicable) information with detailing symptoms suggestive of recurrent VTE and 
bleeding.  Parent(s)/guardian(s)/subject will be asked to immediately contact the Investigator if 
these symptoms occur.  
The following information will be provided to the parent/subject (information booklet): 
 The local medical contact person and emergency telephone number 
 The visit schedule provided by the IXRS (fax or email with dates of telephone and/or 
hospital visits) 
 How to recognize and report signs and symptoms of possible recurrent symptomatic 
PE/DVT or bleeding (see Section 7.1 and Section 9.2.1).  
 Instructions to keep empty medication packages  
 How to use the study medications 
 The scheduled dates of blood collections for the next INR control if VKA is 
dispensed 
 Provide subjects with a subject identification safety card and a prohibited medication 
card 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 66 
The Investigator will use discretion to decide when and how often to repeat INR or anti-FXa 
levels or aPTT measurements or fondaparinux levels.  These measurements will be taken in the 
clinic, or alternatively, optional site-specific local laboratory (Appendix 17.2). 
All suspected VTE and bleeding endpoints as well as hepatic abnormalities identified by the 
Investigator will be adjudicated by the CEC.  Adjudication packages will contain copies of 
images (or films) of appropriate diagnostic tests, clinic notes, laboratory tests, discharge 
summaries, autopsy reports, etc. used in the subject work-up following a suspected event.   
Investigators will maintain a confidential subject identification code list of names of all subjects 
randomized to study to allow the Investigator to reveal the identity of any subject when 
necessary. 
6.3. 
Main Treatment Period 
The Main Treatment Period is defined as the time from randomization until the end of Month 3 
of treatment.  The Main Treatment Period for subjects <6 months old (Cohort 5) is defined as the 
time from randomization until the end of anticoagulant therapy for at least 6 to 12 weeks. 
6.3.1. 
Subjects randomized to the edoxaban treatment arm:  
For the approximately first 12 subjects of each age cohort randomized in edoxaban-treatment 
arm, two blood samples will be collected on Day 5+3 days.  Dosing on Day 5 will be done in the 
study center.  Note: If the subject did not initiate dosing of edoxaban on the randomization day 
(Day 1), the Day 5 PK/PD assessment should be scheduled when the actual Day 5 dose is taken.  
Edoxaban will be started orally at the age/weight/renal function appropriate dose (depending on 
the results of the ongoing U157 study) for the treatment period.  The study will start enrollment 
from older to younger children as data from the single dose PK, PD study become available for 
each age cohort (Study U157). After Month 3, dispense may be provided for a 3-month period to 
align with the visit schedule based on approval of the Sponsor. 
For subjects in Cohort 5, the Principal Investigator (PI) may use medical discretion and clinical 
judgment to determine the duration of anticoagulation treatment.  For these subjects, the intended 
duration of treatment should be at least 6 to 12 weeks.  If 6 weeks’ duration is chosen, a 
radiologic VTE image will be taken and will be assessed by the PI to determine if an additional 6 
weeks of treatment is required.  After 12 weeks, an additional radiologic VTE image will be 
taken by the PI to assess whether the subject should continue on treatment into the extension. 
Approximately 12 subjects from each age cohort (total of approximately 53 to 60 subjects) will 
participate in the multiple-dose PK/PD assessment (subject number is determined by evaluable 
blood specimens demonstrating edoxaban exposure).  For the youngest Cohort 5 (birth to <6 
months), 5 to 12 subjects on edoxaban will be enrolled. 
 Ages 12 to <18 years (N≈12) 
 Ages 6 to <12 years (N≈12) 
 Ages 2 to <6 years (N≈12) 
 Ages 6 months to <2 years (N≈12) 
 Ages birth to <6 months (N≈5-12) 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 67 
6.3.1.1. 
Study Day 5 (+3 days) for Subjects Randomized to Edoxaban Only (Visit 2a) 
Subjects participating in the Day 5 edoxaban evaluation will need to bring their edoxaban 
treatment (wallet card or bottle of granules) to the clinic for dosing that day.  A witness should 
observe the edoxaban dose taken on Day 5 after the pre-dose blood specimen is collected. 
Each subject included in the multiple-dose PK/PD assessment will have a laboratory developed 
test (LDT) PK assay performed for edoxaban exposure verification.  The first approximately 12 
subjects participating in PK/PD assessment should be fasted one hour prior to the uptake of 
edoxaban dose and a maximum of 2 hours after taking edoxaban dose.  If this is not feasible 
because of the subject’s age or other needs, milk, or an equivalent substitute liquid (but not fruit 
juices or caffeinated drinks), will be allowed until 1 hour before and starting at 1 hour post-dose. 
In preparation for the Study Day 5 visit, subjects will be instructed to do the following: 
 Record date/time of the last 2 study drug doses taken before the Day 5 visit 
 Record date/time of the last meal taken before the Day 5 visit 
 Record time of study drug dose taken on visit day 
The PK sampling windows (hours) on the day of the fifth dose of edoxaban (Day 5+3 days) is 
planned to occur as follows: 
 PK Pre-dose sample for all participating subjects.   
 PK Post-dose sample can be taken at either: 
 any time between 1.0 to 3 hours post-dose 
or 
 any time between 5 to 8 hours post-dose 
 The PD sampling times on Day 5 for measurement of PT, aPTT and anti-FXa, will be 
the same time as the PK samples. 
 An edoxaban PK analysis will be performed on Day 5 subjects in U312 study.  If the 
analysis of the subjects confirms the edoxaban exposure predictions and based on 
emerging safety, the expanded enrollment in the same age cohort will be allowed to 
start.  A notification will be sent to all Investigators that expansion of the age cohort 
is permitted after the PK analysis.  In addition, a notification to the investigator will 
indicate that Day 5 PK/PD edoxaban exposure evaluation will no longer be necessary 
for future subjects randomized to edoxaban in the corresponding age cohort. 
 For subjects in Cohort 5, specifically those ≤28 days old, a renal function test (RFT) 
will be performed on or around Day 5 (at the same time of PK sampling). 
Enrollment in the next younger age cohorts in U312 study will begin upon the availability of: 
 PK analysis performed on Day 5 participant subjects in the prior older age cohort in 
U312 
 Safety data analysis on Day 5 subjects in the prior older age cohort in U312 
 PK analysis of the subjects in the next younger age cohort in U157. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 68 
 Safety data analysis on the subjects of the next younger age cohort in U157. 
PK and safety data will be reviewed by an IDMC, (Section 15.9) who will approve the start of 
the next younger age cohort.   
In each age cohort, if the estimated median AUC based on the observed PK data in participating 
subjects in the Day 5 PK assessment is less than 1.5-fold the median AUC from the simulated 
subject population profiles (over-exposure and under-exposure), the enrollment of subjects in the 
corresponding age cohort will continue and enrollment in the next younger age cohort can begin.   
The following will be performed at this visit: 
 Review dosing instructions 
 Safety review for AEs/SAEs 
 Review for endpoint events (VTE, bleeding) 
The Investigator will use discretion to decide when and how often to repeat INR or anti-FXa 
levels or aPTT measurements or fondaparinux levels.  These measurements will be taken in the 
clinic, or alternatively, optional site-specific local laboratory (Appendix 17.2). 
6.3.2. 
Subjects randomized to the SOC treatment arm:  
Standard of Care treatment will be dispensed to the subject on a monthly visit schedule.  After 
Month 3, dispense may be provided for a 3-month period to align with the visit schedule based 
on approval of the Sponsor.  SOC will be provided by the Investigator.  Subject will be treated 
with LMWH, VKA, or SP Xa inhibitors according to the site SOC treatment (Section 5.1.1.2).  
However, if there are regulatory or site hurdles providing the SOC, the Sponsor will provide 
SOC as enoxaparin or fondaparinux or warfarin (see below).  
If Investigators choose to use the SOC supplied by the Sponsor, the subject will be treated as 
follows: 
 Enoxaparin – Subjects will be treated with enoxaparin alone or can be switched to 
warfarin anytime during the study treatment period. 
 Fondaparinux – Subjects will be treated with fondaparinux alone or can be switched 
to warfarin anytime during the study treatment period. 
 For subjects in whom clinicians prescribe warfarin, this will be started on Day 1.  
Heparin (enoxaparin or fondaparinux or UFH depending on the therapy received 
during pre-randomization period) will be discontinued when INR ≥2.0 and ≤3.0 for 2 
consecutive measurements obtained at least 24 to 48 hours apart.  The subject will 
continue warfarin for the remainder of the study treatment period.  
The Investigator will use discretion to decide when and how often to repeat INR or anti-FXa 
levels or aPTT measurements or fondaparinux levels.  These measurements will be taken in the 
clinic, or alternatively, optional site-specific local laboratory (Appendix 17.2).  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 69 
6.3.3. 
Monthly Visits (Months 1 and 2; Visits 3 and 4) for both arms: 
Starting with the Month 1 visit, subjects will return to the clinic every 30 days ± 5 days 
(depending on the visit, see Schedule of Events in Appendix 17.1) until the Month 3 visit (Visit 
5) or study withdrawal.  For Cohort 5, the subjects may return to the clinic earlier after the first 
month, depending on the duration of the therapy (at least 6 to 12 weeks) and imaging at 6 weeks 
for thrombus resolution.  
During study drug interruptions and after study drug discontinuation, subjects will be followed 
for efficacy and safety endpoints and SAEs until the Month 3 visit (Visit 5) or earlier in Cohort 5 
subjects (6-12 weeks).  A 30 day Follow-Up Visit (Visit 9) for safety assessment is required after 
the Month 3 visit (for Cohort 5, the intended duration of treatment is 6 to12 weeks).  
At these monthly on-site visits, anti-FXa levels assessments and aPTT measurements will be 
performed for the subjects on SOC with LMWH or SP Xa inhibitor, fondaparinux levels if 
applicable, and INR assessments will be performed for the subject on SOC with VKA.  
Additional interim visits may be scheduled, at the Investigator’s discretion, for anti-FXa 
levels/INR monitoring. 
6.3.3.1. 
Month 1 Visit (Visit 3) Procedures 
The following will be performed at this visit: 
 Record concomitant medications 
 Count unused study drug tablets/ bottles/syringe and calculate compliance 
 Dispense study drug medication and review dosing instructions  
 Perform physical examination (see Section 9.10) 
 Record vital signs (Section 9.9)  
 Take blood samples for the following laboratory tests (See Table 17.1): 
 Liver function tests [ALT, AST, TBL, and ALP] 
 Serum creatinine 
 Safety review for AEs/SAEs 
 Review for endpoint events (VTE, bleeding) 
6.3.3.2. 
Month 2 (Visit 4) Procedures  
 Record concomitant medications 
 Count unused study drug tablets/ bottles/syringe and calculate compliance 
 Dispense study drug medication and review dosing instructions  
 Perform physical examination (see Section 9.10)  
 Record vital signs (Section 9.9)  
 Safety review for AEs/SAEs 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 70 
 Review for endpoint events (VTE, bleeding) 
 The follow-up imaging performed if needed, must be always performed with the 
same modality as the initial diagnostic study 
6.3.4. 
End of Main Treatment Period Visit (Month 3 or at least 6-12 weeks for Cohort 
5, Visit 5) Procedures 
All randomized subjects including those that have discontinued treatment will have an EOT 
assessment at Month 3 (within a ±5-day window).  
The following will be performed at this visit: 
 Perform physical examination (see Section 9.10)  
 Vital signs (Section 9.9)  
 Review concomitant medications  
 Count unused study drug tablets/ bottles/syringe and calculate compliance 
 Safety review for AEs/SAEs 
 Review for endpoint events (VTE, bleeding) 
 Radiologic examination using the same diagnostic technique used at baseline to 
determine the thrombotic burden (see Section 7.1).  
 VTE Radiologic Imaging (see Section 7.1).  
 Take samples for the following: 
 Liver function tests [ALT, AST, TBL, and ALP] 
 Serum creatinine 
 Hematology 
 Urine pregnancy test 
 Dispense study drug medication and review dosing instructions per subject/parent’s 
request and at the Investigator’s decision to extend study treatment.  After Month 3, 
the distribution of edoxaban or SOC may be for a 3-month period to align with the 
visit schedule, with the Sponsor’s approval. 
6.4. 
Extension Period (beyond Month 3 - Month 6, 9 and 12; Visits 6, 7, 8) 
Per subject/parent’s request and at the Investigator’s decision, study treatment can be extended 
up to 12 months.  At any time during the extended period, a subject can discontinue treatment 
and the study.  In such a case a discontinuation study visit will be performed with a subsequent 
30-day safety Follow-Up Visit (see Table 17.1). 
The subjects on extended treatment will be followed for safety and efficacy assessment including 
bleeding events, recurrent VTE, and any treatment-related AEs at visit for Months 6 (Visit 6), 9 
(Visit 7), and 12/ Discontinuation (Visit 8).  Additionally, the subject will have a Follow-Up 
Visit (Visit 9) for safety assessment 30 days after treatment cessation.  At Month 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 71 
12/Discontinuation Visit, or at any time the subjects discontinues from the study after Month 3, 
the study drug will be collected from the subject and the subject will be switched to SOC 
anticoagulation treatment if necessary, at the discretion of the Investigator.  All subjects who 
require continued SOC anticoagulation treatment at the end of study treatment in accordance 
with the current CHEST guidelines will be transitioned to the SOC determined by the 
Investigator.  The transition algorithms are provided in Appendix 17.5.  The visits will occur 
every 3 months and the following procedures performed. 
At these monthly visits, anti-FXa levels assessments and aPTT measurements will be performed 
for the subjects on SOC with LMWH or SP Xa inhibitor, fondaparinux levels if applicable, and 
INR assessments will be performed for the subject on SOC with VKA.  Additional interim visits 
may be scheduled, at the Investigator’s discretion, for anti-FXa levels/INR monitoring. 
Drug dispensing will occur monthly.  After Month 3, the distribution of edoxaban or SOC may 
be for a 3-month period to align with the visit schedule, with the Sponsor’s approval. 
6.4.1. 
Month 6 (Visit 6) Procedures:   
 Record concomitant medications. 
 Count unused study drug tablets/bottles/syringes and calculate compliance. 
 Dispense study drug medication and review dosing instructions  
 Perform physical examination (see Section 9.10) 
 Record vital signs (Section 9.9)  
 Review for endpoint events (VTE, bleeding) 
 Safety review for AEs/SAEs 
 Collect blood samples for serum creatinine test 
6.4.2. 
Month 9 (Visit 7) Procedures:   
 Record concomitant medications. 
 Count unused study drug tablets/bottles/syringes and calculate compliance 
 Dispense study drug medication and review dosing instructions  
 Perform physical examination (see Section 9.10) 
 Record vital signs (Section 9.9)  
 Review for endpoint events (VTE, bleeding) 
 Safety review for AEs/SAEs 
 Collect blood samples for the following laboratory tests: 
 Liver function tests [ALT, AST, TBL, and ALP] 
 Serum creatinine  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 72 
6.4.3. 
Month 12 / Discontinuation Visit (Visit 8; Appropriate only for subjects treated 
beyond Month 3 and discontinuing study prior to Month 12 Procedures): 
Discontinuation from study visit will only be required for those extended into the study beyond 
Month 3 because all subjects are to be followed though Month 3. 
Procedures for subjects who withdraw from the study or are discontinued from the study 
treatment for any reason are discussed in Section 5.6. 
All randomized subjects extended beyond Month 3 who wish to discontinue treatment and study 
will have discontinuation visit (Visit 8) performed when the last dose of study drug is 
administered after Month 3, to Month 12.   
The following will be performed at this visit: 
 Record concomitant medications. 
 Count unused study drug tablets/bottles/syringes and calculate compliance 
 Perform physical examination (see Section 9.10) 
 Vital signs (Section 9.9)  
 Safety review for AEs/SAEs 
 Review for endpoint events (VTE, bleeding) 
 Collect blood samples for the following laboratory tests: 
 Liver function tests [ALT, AST, TBL, and ALP]  
 Serum creatinine 
 Hematology 
 Urine pregnancy test (for post-menarchal females)  
 VTE Radiologic Imaging 
6.5. 
Required 30 Day Follow-Up Visit (Visit 9) 
6.5.1. 
Follow-up for Subjects Ending/ Completing Study at Month 3 
All randomized subjects completing or discontinuing study therapy prior to Month 3 will have 
end-of-study safety Follow-Up Visits 30 days after Month 3.  Note all study subjects will be 
followed monthly through Month 3 with study procedures even if discontinuing study therapy. 
A 30-day Follow-Up Visit may be performed with a phone call if the following conditions have 
NOT occurred: 
 An SAE was not experienced by the subject at the last visit or during the interval of 
time from the last visit to the Follow-Up Visit, 
 An event (recurrent VTE, or bleeds) was not experienced by the subject at the last 
visit or during the interval of time from the last visit to the Follow-Up Visit. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 73 
6.5.2. 
Follow-Up for Subject Continuing Study beyond Month 3 
Subjects discontinuing study after Month 3 will have a Follow-Up Visit 30 days after their 
discontinuation visit or after completing 12 months of study therapy.   
Note: withdrawal for study subjects (death, lost to follow-up, withdrawal consent, AE) by 
definition will not have a follow-up.  
The following will be recorded or collected: 
 AEs 
 Review endpoint events (VTE, Bleeding) 
 Concomitant medication 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 74 
7. 
EFFICACY ASSESSMENTS 
7.1. 
Primary Efficacy Endpoint(s) 
The primary efficacy endpoint is the composite endpoint consisting of incidence of symptomatic 
recurrent venous thromboembolic disease, death as result of VTE, and no change or extension of 
thrombotic burden (defined below) during the first 3-month period (for Cohort 5, the intended 
duration of treatment is 6-12 weeks ).   
All efficacy endpoints described below will be adjudicated in a blinded manner by the clinical 
events committee. 
Radiologic examination  
 Utilizing the same diagnostic technique at baseline and follow-up to determine the 
thrombotic burden.  
Diagnosis of new/recurrent PE requires meeting 1 or more of the following criteria:  
 A (new) intraluminal filling defect in segmental or more proximal branches of the 
pulmonary artery on spiral CT scan; 
 A mismatched defect on a nuclear ventilation/perfusion (V/Q) scan compared to the 
prior imaging; 
 A non-diagnostic lung scan accompanied by documentation of new deep vein 
thrombosis by (Doppler) ultrasonography or venography.  
Diagnosis of symptomatic recurrent VTE requires the confirmation by appropriate diagnostic 
imaging (see imaging criteria of recurrent VTE) and at least one of the symptoms of VTE in the 
following table: 
 Symptoms of VTE: 
Locations 
Symptoms 
VTE in Upper limb  
(CVL or non-CVL related) 
 Collateral dilated vein on the chest 
 Superior vena cava syndrome 
 Chylothorax 
 Pain and/or Swelling in index limb 
 Reddish or purple discoloration 
VTE in Lower extremity 
(CVL or non-CVL related) 
 Reddish or purple discoloration  
 Swelling 
 Pain 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 75 
Catheter-related thrombosis 
 Dysfunction of catheter (inability to 
aspirate blood) not attributed to catheter 
kinking 
 Catheter-sepsis 
 Thrombocytopenia (especially neonates) 
Pulmonary embolism 
 Dyspnea  
 Pain thorax-pleuritic chest pain  
 Hypoxemia-low O2 saturation 
 Hemoptysis 
 Cough 
 Tachycardia 
 Tachypnea,  
 Fever  
 Syncope 
 Right heart failure 
 Cardiopulmonary arrest 
Sinovenous thrombosis 
 Seizures (focal, generalized) 
 Depressed level of consciousness and 
coma 
 Lethargy 
 Nausea, Vomiting 
 Headache 
 Visual impairment (transient obscurations, 
reduced acuity, blindness) 
 Papilledema 
 Hemiparesis 
 Hemisensory loss 
 Ataxia 
 Speech impairment, Mutism 
 Cranial nerve palsies (VI) 
 Acute psychiatric symptoms 
 Respiratory failure (in neonates) 
 Jittery movements (in neonates) 
 Hydrocephalus 
Splanchnic vein thrombosis 
Portal vein, Splenic vein, Mesenteric vein 
 Abdominal distension/pain 
 Splenomegaly 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 76 
 Upper gastrointestinal-bleed and/or 
melena with esophageal varices (portal 
hypertension) 
Hepatic vein/Vena cava 
 Abdominal distension with ascites and 
hepatomegaly 
 Dilated veins in anterior abdominal walls 
Renal Vein 
 Palpable flank mass 
 Macro or micro hematuria 
 Thrombocytopenia 
 Imaging criteria of recurrent VTE: 
 Abnormal compression ultrasonography where compression had been normal or, 
if non-compressible during screening, an increase in diameter of the thrombus 
during full compression;  
 An extension of the echogenic intra-luminal thrombus or absence of flow in the 
central venous system on Doppler ultrasonography. 
 An extension of an intraluminal filling defect, or a new intraluminal filling defect, 
or an extension of non-visualization of veins in the presence of a sudden cut-off 
on venography.  
 An extension of an intraluminal filling defect, or a new intraluminal filling defect 
on computed tomography angiogram (CTA). 
Locations 
Recommended Diagnostic methods 
VTE in Upper limb  
(CVL or non-CVL related) 
 Ultrasonography (US) for peripheral 
upper limb as axillary, subclavian and 
jugular veins 
 MRV for central intra-thoracic veins 
Alternative imaging techniques: 
 Multi-detector CT venography (MDCT 
venography) 
VTE in Lower extremity 
(CVL or non-CVL related) 
 Doppler US (± repeated 1 week) 
 MRV 
Catheter-related thrombosis 
 Doppler US 
 Echocardiography 
 Conventional venography 
 MRV 
Pulmonary embolism 
 V/Q scanning 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 77 
 Spiral CT pulmonary angiography 
(CTPA) 
 Magnetic resonance pulmonary 
angiography (MRPA) 
Alternative imaging techniques: 
 Cardiac angiography 
 Conventional pulmonary angiography 
 echocardiography 
Sinovenous thrombosis 
 Brain MRI, including T2 imaging and 
MRI with venography (MRV) 
 Pre and post-contrast CT scan with 
venography (CTV) 
Alternative imaging techniques: 
 Doppler flow US; if fontanelle open 
Renal Vein thrombosis 
 US 
Splanchnic and hepatic veins and vena 
cava  
 Doppler/US 
 CT/Scan 
In certain cases, the use of 2 techniques may be required to objectively confirm the diagnosis of 
recurrent VTE.  Further recommendations will be provided in the imaging manual but will be left 
for Investigator’s discretion.   
Diagnosis of fatal VTE is based on 1 or more of the following:   
 Objective diagnostic testing   
 Autopsy  
 Death which cannot be attributed to a documented cause and for which VTE cannot 
be ruled out.  
Thrombotic burden will be assessed by comparison of the diagnostic method used at baseline 
and at Month 3 ± 5 days (for Cohort 5, at 6 to 12 weeks ± 5 days) in the absence of symptomatic 
recurrent VTE.  Hence, the same imaging technique that is used at the enrollment of the subject 
into the study will be required to be used at the end of the observational period ± 3 days.  A 
thrombotic burden endpoint will be registered if there is no regression of the thrombus size or 
extension of the thrombus at Month 3 visit ± 3 days (for Cohort 5, at 6 to 12 weeks ± 3 days) 
after randomization.  
Additionally, thrombotic burden will be assessed at Month 12 ± 5 days / Discontinuation Visit, 
for those subjects who participate in the Extension Period.  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 78 
7.2. 
Secondary Efficacy Endpoint(s) 
The secondary efficacy endpoints include: 
 A composite endpoint consisting of the incidence of symptomatic recurrent venous 
thromboembolic disease, death as a result of VTE, and no change or extension of 
thrombotic burden from randomization to the date of the last dose of study drug + 30 
days. 
 The individual components of the primary efficacy endpoint during the first 3-month 
period: 
 Symptomatic recurrent VTE 
 Death as a result of VTE 
 No change or extension of thrombotic burden.  
 All-cause mortality from randomization to last dose + 30 days. 
 The DVT, Catheter-related thrombosis, PE, and sinovenous thrombosis events within 
and after the first 3-month treatment period (for Cohort 5, the intended duration of 
treatment is 6-12 weeks). 
7.3. 
Exploratory Efficacy Endpoint(s) 
Not applicable. 
7.4. 
Clinical Outcome Endpoint 
The clinical outcome endpoint is:  
 A composite combination of major and CRNM bleedings and symptomatic recurrent 
VTE, and death as result of VTE which occur from first to the last dose + 30 days. 
7.5. 
Appropriateness of Selected Efficacy Endpoint(s) 
Definitions of outcomes in U312 are based on presentations/discussions at the Perinatal and 
Paediatric Haemostasis Subcommittee meetings during the 56th–58th Scientific and 
Standardization Committee (SSC) Meetings of the International Society on Thrombosis and 
Haemostasis (ISTH)21. 
The proposed primary efficacy endpoint in the Phase 3 VTE study (U312) is a composite 
endpoint consisting of the incidence of symptomatic recurrent venous thromboembolic disease, 
death as a result of VTE, or no change or extension of thrombotic burden within the 3-month +3 
days study period. 
In children with VTE disease, the incidence of “no change in thrombotic burden” has been 
reported in several clinical pediatric studies as 14.8%16, 17% and 18%17.  Lack of thrombus 
resolution has been reported as a prognostic factor for the development of post-thrombotic 
syndrome (PTS)18.  PTS is a known complication of VTE that children must endure as chronic 
sequelae that adversely impacts quality of life (QOL) for many decades.  Goldenberg et al. 
conducted a systematic review of PTS in children in 2010.  A total of 997 subjects were assessed 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 79 
for PTS.  In this review, the frequency of PTS post DVT (Upper Extremity/Lower Extremity) 
was reported as high as 26%.  In Goldenberg’s review, the lack of thrombus resolution was 
mentioned as a prognostic factor for the development of PTS. 
The clinical significance of “no change in thrombotic burden” in the incidence of PTS is 
therefore clearly documented.  In order to ensure adequate adjudication of this endpoint, the 
Sponsor will be implementing several steps: 
1. The same imaging technique that is used at the enrollment of the subject into the study 
will be required to be used at the end of the observational period 
2. Detailed instructions ensuring consistency in obtaining images for each of the techniques 
will be provided to the study sites 
3. Both initial and follow-up imaging will be independently and blindly assessed by an 
appropriately qualified central adjudication committee. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 80 
8. 
PHARMACOKINETIC/PHARMACODYNAMIC ASSESSMENTS 
Approximately, the first 12 subjects of each age cohort (total of approximately53 to 60 subjects) 
randomized to the edoxaban treatment arm will participate in the multiple-dose PK/PD 
assessment (Table 8.1) on Day 5 (+3 days, Visit 2a) as follows (subject number is determined by 
evaluable blood specimens demonstrating edoxaban exposure):  
 Ages 12 to <18 years (N≈12) 
 Ages 6 to <12 years (N≈12) 
 Ages 2 to <6 years (N≈12) 
 Ages 6 months to <2 years (N≈12) 
 Ages birth to <6 months (N≈5-12) 
Blood samples will be collected on the day of the fifth dose of edoxaban (Day 5+3 days, Visit 
2a) for all age cohorts, including: 
 PK pre-dose sample.   
 PK post-dose sample can be taken at either: 
 any time between 1.0 to 3 hours post-dose 
or 
 any time between 5 to 8 hours post-dose 
 The PD sampling times on Day 5 for measurement of PT, aPTT and anti-FXa, will be 
taken at the same time as the PK samples.  
 A PK analysis will be performed on subjects in U312 study.  If the analysis of the 
subjects confirms the exposure predictions and based on emerging safety, the 
expanded enrollment in the same age cohort will be allowed to start.  A notification 
will be sent to all Investigators that expansion of the age cohort is permitted after the 
PK analysis.  In addition, a notification will be sent indicating that recruitment for 
Day 5 edoxaban-treated subjects will no longer be necessary for that particular 
cohort. 
 One blood sample will be drawn for RFT (serum creatinine and blood urea nitrogen) 
on or around Day 5 (at the same time of PK sampling). 
Enrollment in the next younger age cohorts in U312 study will begin upon the availability of: 
 PK analysis performed on subjects in the prior older age cohort in U312. 
 Safety data analysis on subjects in the prior older age cohort in U312. 
 PK analysis of the subjects in the next younger age cohort in U157. 
 Safety data analysis on the subjects of the next younger age cohort in U157. 
PK and safety data will be reviewed by an IDMC (Section 15.9) who will approve the start of the 
next younger age cohort.   

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 81 
In each age cohort, if the estimated median AUC based on the observed PK data in a subset of 
subjects in the Day 5 PK assessment is less than 1.5-fold the median AUC from the simulated 
subject population profiles (over-exposure and under-exposure), the enrollment of subjects in the 
corresponding age cohort will continue and enrollment in the next younger age cohort can begin.   
Table 8.1: 
Edoxaban PK/PD Sampling Visits and Collection Times  
Sampling Visits and Times 
Samples per 
Subject 
Number of 
Subjects 
Day 5 + 3 days Edoxaban Dosing  
1. First PK sample (Baseline); t=0,  
2. Second PK sample can be taken at either: 
 
any time between 1.0 to 3 hours post-dose 
or 
 
any time between 5 to 8 hours post-dose 
2 
53 to 60 
Day 5 + 3 days Edoxaban Dosing 
1. First PD sample (Baseline); t=0,  
2. Second PD sample is taken at the same time as the PK 
samples 
2 
53 to 60 
PD Biomarker Assays  
PT, aPTT, anti-FXa  
8.1. 
Pharmacokinetic (PK) Endpoint(s) 
Using population PK analysis, the following PK parameters for edoxaban will be estimated:  
 Apparent systemic clearance (CL/F)  
 Apparent volume of distribution (V/F) of edoxaban 
8.2. 
Pharmacodynamic (PD) Endpoint(s) 
The following biomarkers of coagulation will be estimated: PT, aPTT, anti-FXa.  
8.3. 
Biomarker Endpoint(s) 
Not applicable. 
8.4. 
Immunogenicity 
Not applicable. 
8.5. 
Pharmacogenomic Analysis 
Not applicable. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 82 
9. 
SAFETY EVALUATION AND REPORTING 
9.1. 
Adverse Event Collection and Reporting 
In the event of a Medical Emergency, the Investigator at the study site will institute any medical 
procedures deemed appropriate.  A 24-hour Urgent Medical Contact will be provided to contact 
the Medical Monitor for further guidance. 
Sites will receive a contact card where the following numbers (24-hour Urgent Medical Contact) 
are provided: 
 (primary number) 
 (alternative number) 
The medical call center will contact Medical Monitor for the assigned region.  
All AEs (see Section 9.4.1 for definitions) occurring after the subject signs the Informed Consent 
Form and up to 30 days after the last dose of study drug (ie, the Follow-Up Visit), whether 
observed by the Investigator or reported by the subject, will be recorded on the Adverse Event 
CRF page.  Medical conditions (including laboratory values/vital signs that are out of range) that 
were diagnosed or known to exist prior to Informed Consent will be recorded as part of medical 
history.   
All AEs, serious adverse events (SAEs), bleeding, and events of special interest are to be 
reported according to the procedures in Section 9.5.   
All laboratory results and vital signs should be appraised by the Investigator to determine their 
clinical significance.  Isolated abnormal laboratory results or vital sign findings should be 
reported as AEs if they are symptomatic, lead to study drug discontinuation, dose reduction, 
require corrective treatment, or constitute an AE in the Investigator’s clinical judgment. 
At each visit, the Investigator will determine whether any AEs have occurred by evaluating the 
subject.  Adverse events may be directly observed, reported spontaneously by the subject or by 
questioning the subject at each study visit.  Subjects should be questioned in a general way, 
without asking about the occurrence of any specific symptoms.  Parents will be guided to look 
out for signs and symptoms related to bleeding risks.  The Investigator must assess all AEs to 
determine seriousness, severity, and causality, in accordance with the definitions in Section 9.4.  
The Investigator’s assessment must be clearly documented in the site’s source documentation 
with the Investigator’s signature.  In this pediatric population, specifically in the youngest cohort 
(Cohort 5) hospitalized (subjects who are  ≤28 days old), site staff will contact the parents by 
phone on approximately Day 2, Day 7, and every week thereafter until Month 1 (Visit 3) post 
discharge to inquire about AEs, SAEs, and bleeding events. 
Always report the diagnosis as the AE or SAE term.  When a diagnosis is unavailable, report the 
primary sign or symptom as the AE or SAE term with additional details included in the narrative 
until the diagnosis becomes available.  If the signs and symptoms are distinct and do not suggest 
a common diagnosis, report them as individual entries of AE or SAE.   
For events that are serious due to hospitalization, the reason for hospitalization must be reported 
as the serious adverse event (diagnosis or symptom requiring hospitalization).  A procedure is 
not an AE or SAE, but the reason for the procedure may be an AE or SAE.  Pre-planned (prior to 
PPD
PPD

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 83 
signing the Informed Consent Form) procedures or treatments requiring hospitalization for pre-
existing conditions that do not worsen in severity should not be reported as SAEs (see Section 
9.4.2 for Definitions).   
For deaths, the underlying or immediate cause of death should always be reported as an SAE.   
Any serious, untoward event that may occur subsequent to the reporting period that the 
Investigator assesses as related to study drug should also be reported and managed as an SAE. 
The Investigator should follow subjects with adverse events until the event has resolved or the 
condition has stabilized.  In case of unresolved adverse events, including significant abnormal 
laboratory values at the end of study assessment, these events will be followed until resolution or 
until they become clinically not relevant. 
9.2. 
Safety Endpoint Event(s) 
All potential safety endpoints will be adjudicated by an independent CEC.  Study endpoints and 
safety data will be periodically reviewed by an IDMC to ensure the safety of study participants. 
The safety related secondary objectives are: 
 To compare edoxaban against SOC with regard to the combination of major and 
CRNM bleedings occurring during treatment or within 3 days of completing or 
interrupting or stopping study during the first 3-month treatment period (for Cohort 5, 
the intended duration of treatment is at least 6 to 12 weeks).  
 To compare edoxaban against SOC with regard to all bleedings which occur from 
first to the last dose + 30 days. 
 To compare edoxaban against SOC with regard to a composite combination of major 
and CRNM bleedings from first to the last dose + 30 days. 
The corresponding safety endpoints are: 
 A combination of major and CRNM bleedings occurring during treatment or within 3 
days of completing or interrupting or stopping study during the first 3-month 
treatment period.  For subjects in Cohort 5, ie,<6 months old, the primary safety 
endpoint, is a combination of major and CRNM bleedings occurring during treatment 
or within 3 days of completing or interrupting or stopping study within 6 to 12 weeks 
period + 3 days.  
 All bleedings from first to the last dose + 30 days. 
 A combination of major and CRNM bleedings from first to the last dose + 30 days 
9.2.1. 
Bleeding 
Bleeding is a protocol-specified endpoint and a known concern associated with anticoagulant 
therapy including edoxaban and VKAs (including warfarin).  All bleeding events will be 
reported in the eCRF as either an AE or SAE depending upon the seriousness criteria along with 
completion of the bleeding event form.  All bleeding events will be adjudicated by the CEC. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 84 
Bleeding definitions are based on presentations/discussions at the Perinatal and Paediatric 
Haemostasis Subcommittee meetings during the 56th-58th Scientific and Standardization 
Committee (SSC) Meeting of the ISTH.21 
Major bleeding is defined as a composite (ie, any) of the following: 
 Fatal bleeding; and/or   
 Symptomatic bleeding in a critical area or organ, such as intracranial, intra-spinal, 
intraocular, retroperitoneal, intra-articular, pulmonary, or pericardial, or intramuscular 
with compartment syndrome; and/or  
 Bleeding causing a decrease in hemoglobin level of 2 g/dL (1.24 mmol/L) or more, or 
leading to transfusion of the equivalent of two or more units of whole blood or red 
blood cells (RBCs). 
Clinically relevant non-major bleeding is defined as either of the following:  
 Acute or sub-acute clinically overt bleed that does not meet the criteria for a major 
bleed but prompts a clinical response, in that it leads to at least one of the following:  
 A hospital admission for bleeding; 
 A physician-guided medical or surgical treatment for bleeding or  
 A change in antithrombotic therapy (including interruption or discontinuation of 
study drug).  
Minor bleeding is defined as follows:  
 Any overt or macroscopic evidence of bleeding that does not fulfill the above criteria 
for either major bleeding or clinically relevant, non-major bleeding  
Minimal criteria defining a significant bleeding per ISTH27 are as follows: 
For each specific bleeding symptom, the ISTH/Scientific and Standardization Committee (SSC) 
joint working group proposed minimal criteria in order to classify a symptom as significant: 
1. Epistaxis:  
 Any nosebleed, especially occurring after puberty that causes subject concern (eg, 
interference or distress with daily or social activities) is considered significant.  
 In general, epistaxis should not be considered significant when it lasts less than 10 
minutes, has a frequency of <5 episodes/year, has a seasonal occurrence, or is 
associated with infections of the upper respiratory tract or other identifiable cause 
(e.g., dusty dry air). 
2. Cutaneous bleeding:  
 Bruises are considered significant when 5 or more (>1 cm) in exposed areas; 
 Petechiae are considered significant when adequately described by the subject or 
relatives;  
 Hematomas are considered significant when occurring without trauma. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 85 
3. Minor cutaneous wound:  
 Any bleeding episode caused by superficial cuts (eg, by shaving razor, knife, or 
scissors) or that requires frequent bandage changes is considered significant.  
 Insignificant bleeding from wounds includes those of duration <10 minutes and 
lesions that usually require stitches in normal subjects (eg, under the chin).  
 Symptoms should also be manifest on more than 1 occasion to be considered 
significant. 
4. Oral cavity bleeding:  
 Gum bleeding should be considered significant when it causes frankly bloody sputum 
and lasts for 10 minutes or longer on more than one occasion.  
 Tooth eruption or spontaneous tooth loss bleeding should be considered significant 
when it requires assistance or supervision by a physician, or lasts at least 10 minutes 
(bleeding associated with tooth extraction is considered separately).  
 Bleeding occurring after bites to lips, cheek, and tongue should be considered 
significant when it lasts at least 10 minutes or causes a swollen tongue or mouth. 
5. Hematemesis, melena, and hematochezia:  
 Any gastrointestinal bleeding that is not explained by the presence of a specific 
disease should be considered significant. 
6. Hematuria:  
 Only macroscopic hematuria (from red to pale-pink urine) that is not explained by the 
presence of a specific urologic disease should be considered significant. 
7. Tooth extraction:  
 Any bleeding occurring after leaving the dentist’s office and requiring a new, 
unscheduled visit or prolonged bleeding at the dentist’s office causing a delay in the 
procedure or discharge should be considered significant. 
8. Surgical bleeding: 
 Any bleeding judged by the surgeon to be abnormally prolonged, that causes a delay 
in discharge, or requires some supportive treatment is considered significant. 
9. Menorrhagia:  
 Any bleeding that interferes with daily activities such as work, housework, exercise 
or social activities during most menstrual periods should be considered significant.  
 Criteria for significant bleeding may include any of the following: changing pads 
more frequently than every 2 hours; menstrual bleeding lasting 7 or more days; and 
the presence of clots >1 cm combined with a history of flooding.  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 86 
10. Muscle hematomas or hemarthrosis.  
 Any spontaneous joint/muscle bleeding (not related to traumatic injuries) is 
considered significant. 
11. Central nervous system bleeding.  
 Any subdural or intra-cerebral hemorrhage is considered significant 
All safety and efficacy endpoints described will be adjudicated in a blinded manner by the CEC.   
The CEC will require all available details about the bleeding event and related information to 
allow successful objective adjudication of the event.  Details may include, but are not limited to, 
information such as the following: 
 Location of the bleeding; 
 Duration of the bleeding; 
 Fatality 
 Treatment for bleeding event, including notes or summary of the recommendations 
from a healthcare professional from whom medical treatment was obtained; 
 Magnitude of the bleeding (including size if skin or subcutaneous hematoma); 
 Hemoglobin levels at randomization and at the time of the bleeding event, lowest 
value, pre- and post-transfusion values, and after resolution of the bleeding event; 
 Diagnostic tests done to evaluate the bleeding such as endoscopy (GI bleed), ENT 
consult (ear, nose, throat bleed), urology consult (hematuria or urogenital bleeding), 
surgical consult (skin and soft tissue, including intra-abdominal bleeding), 
gynecological consult (uterine or vaginal bleeding), neurological consult (intracranial 
bleed), or ophthalmology consult (intraocular bleed); 
 Diagnostic scans (CT scans or MRIs), ultrasounds or x-rays performed to evaluate the 
bleeding (intracranial bleed)  
 Any other information that can be of help to the CEC to allow successful objective 
adjudication of the bleeding event. 
9.3. 
Events of Special Interest 
9.3.1. 
Liver Enzyme Abnormalities/Liver Dysfunction 
Liver function is an area of special interest.  Critical liver laboratory assessments include ALT, 
AST, TBL, and ALP.  Particular attention will be paid to subjects with ALT or AST ≥3 × ULN 
and TBL ≥2 × ULN simultaneously without evidence of cholestasis (ALP ≥2 × ULN is 
considered evidence of possible cholestasis) and without alternative etiology for hepatocellular 
damage.  
Liver enzyme abnormalities that lead to study drug interruption/discontinuation as well will be 
adjudicated in a blinded manner by the CEC.  The CEC charter includes a process by which 
selected cases will be adjudicated by a liver disease specialist. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 87 
In cases of liver laboratory abnormalities, it is important to ensure that the nature and the extent 
of liver injury is identified and study subjects are monitored until the liver laboratory 
assessments return to normal. 
If the subject discontinued study drug due to liver enzyme abnormalities, the subject will have 
additional evaluations in order to determine the nature and severity of the liver injury.  The 
documents to be sent for adjudication: 
 Results of confirmatory tests and diagnostic evaluation 
 The hepatic event adjudication worksheets. 
If a subject temporarily interrupts (or discontinues) study drug due to confirmed liver enzyme 
abnormalities or jaundice, the subject will have additional evaluations as described in 
Section 5.6.3 at the discretion of the Investigator.  
Combined elevations of aminotransferases and bilirubin, either serious or non-serious and 
whether or not causally related, meeting the laboratory criteria of a potential Hy’s Law case 
[ALT or AST ≥3 × ULN with simultaneous TBL ≥2 × ULN] should always be reported to the 
Sponsor using a SAVER form, in addition to reporting it in eCRF, with the Investigator’s 
assessment of seriousness, causality, and a detailed narrative.  These events should be reported 
within 24 hours of Investigator’s awareness of the event. 
If the subject discontinues study drug due to liver enzyme abnormalities, the subject will have 
additional clinical and laboratory evaluations until clinically acceptable resolution in order to 
determine the nature and severity of the potential liver injury. 
9.4. 
Adverse Event 
9.4.1. 
Definition of Adverse Event 
An adverse event is any untoward medical occurrence in a subject administered a pharmaceutical 
product and that does not necessarily have to have a causal relationship with this treatment.  An 
AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory 
finding, for example), symptom, or disease temporally associated with the use of a medicinal 
product, whether or not considered related to the medicinal product (ICH E2A Guideline.  
Clinical Safety Data Management: Definitions and Standards for Expedited Reporting, Oct 
1994). 
It is the responsibility of Investigators, based on their knowledge and experience, to determine 
those circumstances or abnormal laboratory findings which should be considered adverse events. 
9.4.2. 
Serious Adverse Event 
A serious adverse event is any untoward medical occurrence that at any dose: 
 Results in death, 
 Is life-threatening, 
 Requires inpatient hospitalization or prolongation of existing hospitalization, 
 Results in persistent or significant disability/incapacity, 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 88 
 Is a congenital anomaly/birth defect, or 
 Is an important medical event. 
Note: The term “life-threatening” in the definition of “serious” refers to an event in which the 
subject was at risk of death at the time of the event; it does not refer to an event which 
hypothetically might have caused death if it were more severe (ICH E2A Guideline.  Clinical 
Safety Data Management: Definitions and Standards for Expedited Reporting, Oct 1994). 
Medical and scientific judgment should be exercised in deciding whether expedited reporting is 
appropriate in other situations, such as important medical events that may not be immediately 
life-threatening or result in death or hospitalization but may jeopardize the subject or may require 
intervention to prevent one of the other outcomes listed in the definition above.  Examples 
include allergic bronchospasm, convulsions, and blood dyscrasias or development of drug 
dependency or drug abuse. 
Note:  
 Procedures are not AEs or SAEs, but the reason for the procedure may be an AE or 
SAE.   
 Pre-planned (prior to signing the Informed Consent Form) procedures or treatments 
requiring hospitalizations for pre-existing conditions that do not worsen in severity 
are not SAEs. 
9.4.3. 
Severity Assessment 
The following definitions should be used to assess intensity of adverse events: 
 Mild: Awareness of sign or symptom, but easily tolerated, ie, does not interfere with 
subject’s usual function. 
 Moderate: Discomfort enough to cause interference with usual activity. 
 Severe: Incapacitating with inability to work or do usual activity, ie, interferes 
significantly with subject’s usual function. 
Severity vs. Seriousness: Severity is used to describe the intensity of a specific event while the 
event itself, however, may be of relatively minor medical significance (such as severe headache).  
This is not the same as "seriousness," which is based on patient/event outcome at the time of the 
event. 
9.4.4. 
Causality Assessment 
The Investigator should assess causal relationship between an adverse event and the study drug 
on the basis of his/her clinical judgment and the following definitions.  The causality assessment 
must be made based on the available information and can be updated as new information 
becomes available. 
 Related: 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 89 
 The AE follows a reasonable temporal sequence from study drug administration, 
and cannot be reasonably explained by the subject’s clinical state or other factors 
(eg, disease under study, concurrent diseases, and concomitant medications). 
or 
 The AE follows a reasonable temporal sequence from study drug administration, 
and is a known reaction to the drug under study or its chemical group, or is 
predicted by known pharmacology. 
 Not Related: 
 The AE does not follow a reasonable sequence from study drug administration, or 
can be reasonably explained by the subject’s clinical state or other factors (eg, 
disease under study, concurrent diseases, and concomitant medications).  
9.4.5. 
Action Taken Regarding Study Drug(s) 
 Dose Not Changed: No change in study drug dosage was made. 
 Drug Withdrawn: The study drug was permanently stopped. 
 Dose Reduced: The dosage of study drug was reduced. 
 Drug Interrupted: The study drug was temporarily stopped. 
 Dose Increased: The dosage of study drug was increased. 
 Not Applicable: (eg Subject died, study treatment had been completed prior to 
reaction/event, or reaction/event occurred prior to start of treatment) 
9.4.6. 
Other Action Taken for Event 
 None. 
 No treatment was required. 
 Medication required. 
 Prescription and/or OTC medication was required to treat the adverse event. 
 Hospitalization or prolongation of hospitalization required. 
 Hospitalization was required or prolonged due to the AE, whether or not 
medication was required. 
 Other. 
9.4.7. 
Adverse Event Outcome 
 Recovered/Resolved 
 The subject fully recovered from the adverse event with no residual effect 
observed. 
 Recovering/Resolving 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 90 
 The adverse event improved but has not fully resolved. 
 Not Recovered/Not Resolved 
 The adverse event itself is still present and observable. 
 Recovered/Resolved with Sequelae 
 The residual effects of the adverse event are still present and observable. 
 Include sequelae/residual effects. 
 Fatal 
 Fatal should be used when death is a direct outcome of the adverse event. 
 Unknown 
9.5. 
Serious Adverse Events and Adverse Event of Special Interest 
Reporting–Procedure For Investigators 
All AEs, SAEs, including efficacy and safety endpoints that will be adjudicated will be reported 
in the CRF. 
In the event of a Medical Emergency, the Investigator at the study site will institute any medical 
procedures deemed appropriate.  A 24-hour Urgent Medical Contact will be provided to contact 
the Medical Monitor for further guidance. 
Sites will receive a contact card where the following numbers (24-hour Urgent Medical Contact) 
are provided: 
 (primary number) 
 (alternative number) 
The medical call center will contact Medical Monitor for the assigned region. 
Serious events that are also efficacy endpoints (such as VTE and PE) and/or safety endpoints 
(such as bleeding events that are not life-threatening or fatal) will be exempted from SAE 
processing and expedited reporting.  All efficacy and safety endpoints will be captured on 
specifically designed eCRFs.  These events are clinically anticipated events in the target 
treatment population, and will be periodically reviewed by the IDMC to ensure prompt 
identification of any clinically concerning safety issues. 
The following types of events should be reported by the Investigator on a Serious Adverse 
Events Reporting (SAVER) form within 24 hours of awareness: 
 SAEs (see Section 9.4.2 for definition), including life-threatening or fatal bleeds. 
 All SAEs resulting in death, regardless of whether they are waived endpoints for 
processing and expedited reporting, will be processed by the CRO for entry into the 
Sponsor's global safety database. 
 Hepatic events meeting combination abnormalities [ALT or AST ≥3 × ULN with 
simultaneous TBL ≥2 × ULN] (potential Hy’s Law case), both serious and non-
serious (see Section 9.3.1 for additional details). 
PPD
PPD

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 91 
All events (serious and non-serious, including efficacy and safety endpoint events) must be 
reported with Investigator’s assessment of the event’s seriousness, severity, and causality to the 
study drug.  A detailed narrative summarizing the course of the event, including its evaluation, 
treatment, and outcome should be provided where indicated.  Specific or estimated dates of event 
onset, treatment, and resolution should be included when available.  Medical history, 
concomitant medications, and laboratory data that are relevant to the event should also be 
summarized in the narrative.  For fatal events, the narrative should state whether an autopsy was 
or will be performed, and include the results if available.  Source documents (including medical 
reports) will be retained at the study center and should not be submitted to the Sponsor for SAE 
reporting purposes. 
Urgent safety queries must be followed up and addressed promptly.  Follow-up information and 
response to non-urgent safety queries should be combined for reporting to provide the most 
complete data possible within each follow-up.  
See Section 15.12 for contact information for SAE reporting.  Please call your study monitor for 
any questions on SAE reporting.   
9.6. 
Notifying Regulatory Authorities, Investigators, and Institutional 
Review Board/Ethics Committee 
Daiichi Sankyo and/or CRO will inform Investigators, Institutional Review Boards/Ethics 
Committees (IRBs/ECs), and regulatory authorities of any Suspected Unexpected Serious 
Adverse Reactions (SUSARs) occurring in other study centers or other studies of the 
investigational drug, as appropriate per local reporting requirements.  Daiichi Sankyo and/or 
CRO will comply with any additional local safety reporting requirements. 
In the US, upon receipt of the Sponsor’s notification of SUSARs that occurred with the study 
drug, unless delegated to the Sponsor, it is the Investigator’s responsibility to inform the IRB per 
Sponsor’s instruction. 
In the European Economic Area (EEA) states, it is the Sponsor’s responsibility to report 
SUSARs to all ECs. 
9.7. 
Exposure In Utero During Clinical Studies 
Daiichi Sankyo must be notified of any subject who becomes pregnant while receiving edoxaban 
and within 30 days of discontinuing the study drug.  
Although pregnancy is not technically an adverse event, all pregnancies must be followed to 
conclusion to determine their outcome.  This information is important for both drug safety and 
public health concerns.  It is the responsibility of the Investigator, or designee, to report any 
pregnancy in a female subject using the Exposure In Utero (EIU) Reporting form.  Please contact 
your study monitor to receive the EIU Reporting Form upon learning of a pregnancy.  The 
Investigator should make every effort to follow the subject until completion of the pregnancy and 
complete the EIU Reporting Form with complete pregnancy outcome information, including 
normal delivery and induced abortion.  The adverse pregnancy outcome, either serious or non-
serious, should be reported in accordance with study procedures.  If the outcome of the 
pregnancy meets the criteria for immediate classification as a SAE (ie, post-partum 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 92 
complications, spontaneous or induced abortion, stillbirth, neonatal death, or congenital 
anomaly, including that in an aborted fetus), the Investigator should follow the procedures for 
reporting SAEs outlined in Section 9.5.  
9.8. 
Clinical Laboratory Evaluations 
Blood and urine samples for clinical laboratory evaluations will be shipped to a central 
laboratory for analysis.  Results of all clinical laboratory tests will be reported in the subject’s 
eCRF or merged electronically with the clinical database.  
For the Screening Visit (Visit 1) samples taken as part of routine care outside study auspices may 
be analyzed by local clinical laboratories and the results used to qualify the subject provided the 
tests were performed for the newly diagnosed index VTE before randomization.  Only local 
laboratory results for qualification purpose will be entered in the EDC (liver function test (LFT), 
serum creatinine, platelets, aPTT and INR). 
9.8.1. 
Hematology  
The ethylenediaminetraacetic acid (EDTA) tube of blood will be drawn for the hematology 
assessments listed in Table 9.1.  These will be measured from samples obtained at the Screening 
/Qualification visit (Visit 1), Month 3 (Visit 5) and Month 12/ Discontinuation Visits (Visit 8).  
Table 9.1: 
Hematology Analyses 
Hemoglobin 
Hematocrit 
Red blood cell (RBC) count (with indices) 
White blood cell (WBC) count  
Platelet count 
9.8.2. 
Blood chemistry  
A serum separating tube of blood will be drawn for the blood chemistry assessments listed in 
Table 9.2.  These will be measured from samples obtained at the Screening /Qualification Visit 
(Visit 1).  For the Screening /Qualification visit, samples taken as part of routine care may be 
analyzed by local laboratories.  The results may be used to qualify the subject, provided the tests 
were performed for the newly diagnosed index VTE before randomization.  If central laboratory 
is also used at the same visit with a resulting discrepancy for exclusion criteria, the local 
laboratory result will still be used to qualify the subject. 
Creatinine will also be measured on Month 1, 3, 6, 9, and Month 12 / Discontinuation Visits.  
Table 9.2: 
Blood Chemistry 
Sodium 
Creatininea 
Potassium 
Blood urea nitrogen 
Bicarbonate  
Alkaline phosphatase  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 93 
AST 
Total bilirubin  
ALT 
 
a Serum creatinine will be measured at Screening, On-Treatment Study Visits (Month 1, 3, 6, 9 and Month 12/ 
Discontinuation)  
Abbreviations: ALT = alanine aminotransferase; AST = aspartate aminotransferase 
9.8.3. 
Estimated Glomerular Filtration Rate (eGFR) Assessment 
Estimated glomerular filtration rate (eGFR) will be estimated from serum creatinine 
(Appendix 17.7). 
9.8.4. 
Urinalysis 
Standard urinalysis including a microscopic examination will be conducted for all subjects at the 
Screening /Qualification Visit (Visit 1) (Table 9.3). 
Table 9.3: 
Urinalysis Determinations 
Specific gravity 
Blood 
pH 
RBC 
Protein 
WBC 
Glucose 
Bilirubin 
Ketones 
Urobilinogen 
Abbreviations: RBC = red blood cell; WBC = white blood cell. 
For samples with findings on macroscopic analysis, microscopic examination for RBCs, white 
blood cells (WBCs), bacteria, and casts should be performed. 
9.8.5. 
Hepatitis Serology (to be performed only when indicated and for Hy’s Law cases 
[LFT ≥3 × and bilirubin ≥2 × ULN]) 
If a subject temporarily interrupts (or discontinues) study drug due to confirmed liver enzyme 
abnormalities or jaundice, the subject will have additional evaluations at the discretion of the 
Investigator as follows: 
 Hepatitis A, B, C, and E screening (anti-HAV IgM, HBsAg, anti-HCV plus viral titer, 
and evaluation for Hepatitis E),  
 Antinuclear antibody (ANA) and anti-SmAb,  
 Cytomegalovirus (CMV), Epstein-Barr virus (EBV)  
9.8.6. 
Pregnancy Testing 
All female subjects must have a negative urine pregnancy test at the specified visits.  A highly 
sensitive urine pregnancy test will also be performed at the Screening /Qualification Visit (Visit 
1), On-Treatment Study Visits (Month 3 (Visit 5) and Month 12 (Visit 8) only) and 
Discontinuation Visits.   

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 94 
9.9. 
Vital Signs 
BP, heart rate, and body temperature after resting in a sitting or supine position (Note: the 
appropriate cuff size base on arm circumference will be used).  Vital signs are captured for 
selected scheduled visits. 
9.10. 
Physical Examinations 
Physical examination will be conducted for selected scheduled visits and includes:  
 Height and body weight (may be performed by an Investigator or other healthcare 
provider designated by the Investigator). 
A physical examination will consist of assessment of each of the relevant major body systems. 
9.11. 
Other Examinations 
Not applicable. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 95 
10. 
OTHER ASSESSMENTS 
Not applicable. 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 96 
11. 
STATISTICAL METHODS  
11.1. 
Analysis Sets 
Randomized Analysis Set will include all subjects who are randomized.   
Safety Analysis Set will include all subjects in the Randomized Analysis Set who received at 
least one dose of study drug actually taken. 
Modified ITT (mITT) Analysis Set will include all subjects in the Randomized Analysis Set who 
received at least one dose of randomized study drug.  
Per-protocol (PP) Set will include all subjects in the mITT Analysis Set who are sufficiently 
compliant with the protocol.  Criteria of sufficiently compliant will be detailed in SAP. 
PK Analysis Set will include all subjects in the Safety Analysis Set who had at least one PK 
sample with measurable concentration.   
PD Analysis Set will include all subjects in the Safety Analysis Set who had at least one 
measurable PD sample.   
11.2. 
General Statistical Considerations 
All efficacy analyses will be based on the mITT Analysis Set or PP Analysis Set and will be 
performed based on the treatment arm assigned at randomization.  All statistical tests will be 
two-sided at a 5% significance level, unless otherwise specified.   
Safety analysis will be performed using the Safety Analysis Set.  Subjects will be analyzed 
according to actual treatment received. 
Unless otherwise specified, the baseline value of an efficacy variable for a subject is the last non-
missing measurement before the first administration of study drug, and the baseline value of a 
safety variable is the last non-missing measurement before the first dose of the study drug. 
In general, missing data will not be imputed for the purpose of data analysis.  No visit windows 
will be used for analysis. 
Continuous variables will be summarized by the number of observations, mean, standard 
deviation, median, and minimum and maximum values.  Categorical variables will be 
summarized using frequency counts and percentages.  Summary statistics will be presented by 
treatment arm. 
11.3. 
Study Population Data 
Subject disposition will be summarized for each treatment arm and in total for the Randomized 
Analysis Set.  The number and percentage of randomized subjects who discontinued treatment 
prematurely will be tabulated by main reason for discontinuation and treatment arm.  
The number of subjects for each defined analysis set by treatment arm as well as in total 
population will also be tabulated. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 97 
Subjects excluded from the analysis sets will be listed and summarized by treatment arm and 
reason for exclusion.  A listing of all subjects with major protocol deviations will also be 
provided. 
The demographic and baseline characteristics such as age, sex, race, type of index event, will be 
summarized descriptively for the mITT, PP, and Safety Analysis Sets. 
Study drug exposure and study duration will be summarized using descriptive statistics by 
treatment arm for the Safety Analysis Set.  Edoxaban compliance will also be summarized.   
Study drug exposure and study duration will be summarized using descriptive statistics by 
treatment group for the Safety Analysis Set.   
Subject disposition will be summarized for each randomized treatment group and in total for the 
mITT Analysis Set.  The number of subjects for each defined analysis set by treatment group as 
well as in total population will also be tabulated. 
Prior and concomitant medication will be summarized for the Safety Analysis Set. 
11.4. 
Statistical Analysis 
11.4.1. 
Efficacy Analyses 
11.4.1.1. Primary Efficacy Analyses 
The primary efficacy analysis will be based on mITT Analysis Set.  Analyses will be based on 
the randomized treatment arm even if a subject inadvertently receives the incorrect study drug.  
The primary efficacy endpoint is an event driven and a composite endpoint including 
symptomatic recurrent venous thromboembolic disease, death as result of VTE, and no change or 
extension of thrombotic burden from randomization to up to 3 months + 3 days from 
randomization.  In this analysis, the time to the first event of the composite primary efficacy 
outcome will be analyzed using a Cox’s proportional hazard regression model including 
treatment arm and age groups as covariates.  Although this study is also stratified by region, 
region is not included in the model as a covariate because some age groups within regions may 
be very small due to the small overall sample size.  The time to first event is defined as the time 
(days) from the day of randomization to the first event experienced by a subject during the 3 
months + 3 days period.  Subjects who did not have a primary efficacy outcome during the 3 
months + 3 days period will be censored at 3 months + 3 days or the last day the subject had a 
complete assessment for study outcomes, whichever comes first.  The edoxaban-to-comparator 
hazard ratio will be computed with 95% confidence interval (CI) (two-sided) based on this 
model.  Edoxaban will be considered non-inferior to comparator if the upper limit of the 95% CI 
is ≤1.5. 
If non-inferiority of edoxaban is established, edoxaban will be tested for superiority to 
comparator.  Edoxaban will be considered superior to comparator if the upper limit of the 95% 
CI from above analysis is ≤1.0.  
To control study-wise type I error, the testing for non-inferiority and superiority will follow the 
plan as described below. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 98 
Primary Efficacy Endpoint 
mITT Analysis Set 
Non-inferiority Testing: α=0.05 (ie, compare 
upper limit of two-sided 95% CI of 
edoxaban-to-comparator hazard ratio with 
1.5) 
 
Primary Efficacy Endpoint, mITT Analysis 
Set  
Superiority Testing: α=0.05 (ie, compare 
upper limit of two-sided 95% CI of 
edoxaban-to-comparator hazard ratio with 
1.0) 
The same proportional hazard model used for primary efficacy analysis will be performed for PP 
Analysis Set and Randomized Analysis Set as sensitivity analyses. 
11.4.1.2. Secondary Efficacy Analyses 
The following secondary efficacy analyses will be conducted: 
 A composite endpoint, including symptomatic recurrent venous thromboembolic 
disease, death as result of VTE, and no change or extension of thrombotic burden 
from the randomization to the date of the last dose of study drug + 30 days, the same 
Cox proportional hazards regression model used for the primary efficacy analysis will 
be used.  The time to first event is defined as the time (days) from the day of 
randomization to the first event experienced by a subject from the randomization to 
the date of the last dose of study drug + 30 days.  Subjects who did not have a 
primary efficacy outcome during the study period will be censored at the last day the 
subject had a complete assessment for study outcomes or the last study drug + 30 
days, whichever came first.  These efficacy analyses will be based on mITT and PP 
Analysis Sets.  The incidence of this composite endpoint will also be summarized by 
treatment arm for the mITT and PP Analysis Sets. 
 Incidence of all-cause mortality from randomization to the date of the last dose of 
study drug + 30 days will also be summarized by treatment arm for the mITT 
Analysis Set. 
 The incidence of each component (symptomatic recurrent venous thromboembolic 
disease, death as result of VTE, and no change or extension of thrombotic burden) of 
the composite primary endpoint occurred during the first 3 month treatment period 
will be summarized by treatment arm for the mITT and PP Analysis Sets. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 99 
 The occurrence of DVT, catheter-related thrombosis, sinovenous thrombosis, and PE 
during the first 3-month treatment period, after the 3 month treatment period will be 
summarized by treatment arm for the mITT Analysis Set 
11.4.1.3. Exploratory Efficacy Analyses 
Not applicable. 
11.4.1.4. Clinical Benefit Analysis 
The following clinical outcome analysis will be conducted: 
 Net clinical outcome, defined as the composite of symptomatic recurrent VTE events, 
death as a result of VTE, and major and CRNM bleeding that occurred from the date 
of the first dose of study drug to the date of last dose of study drug + 30 days, will be 
analyzed using the same Cox proportional hazards regression model used for the 
primary efficacy analysis for mITT Analysis Set.  The incidence of this endpoint will 
also be summarized by treatment for the mITT and PP Analysis Sets. 
11.4.2. 
Pharmacokinetic/Pharmacodynamic Analyses 
11.4.2.1. Pharmacokinetic Analyses 
Plasma concentration and biomarker data will be summarized by age, dose, and time point using 
descriptive statistics for PK Analysis Set in this study.   
The plasma concentration data will be pooled with data from other studies for a population PK 
analysis using nonlinear mixed effects modeling; the results will be provided in a separate report 
from the clinical study report for this study.  
Exposure response relationships will be evaluated using Bayesian estimates of edoxaban 
exposure metrics (such as Cav, Cmax, Ctrough, and AUC) to explore relationships with safety and 
efficacy endpoints through a model based approach; the results will be provided in a separate 
report from the clinical study report for this study. 
11.4.2.2. Pharmacodynamic Analyses 
Pharmacodynamic data will be summarized by age, time point, and treatment arm using 
descriptive statistics for PD Analysis Set in this study.   
11.4.2.3. Biomarker Analyses 
Not applicable. 
11.4.2.4. Pharmacogenomic Analyses 
Not applicable 
11.4.3. 
Safety Analyses 
All safety analyses will be performed on the Safety Analysis Set, unless specified otherwise.  
Analyses will be based on the randomized treatment arm, unless a subject inadvertently receives 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 100 
the incorrect drug during the entire study, in which case, the subject will be grouped according to 
the treatment actually received. 
11.4.3.1. Analysis of bleeding events 
An  analysis will be performed for the composite safety endpoint of  major and CRNM bleeding 
events which occur on-treatment from the first dose of study drug to 3 months + 3 days, or to the 
last dose of the study drug + 3 days if the subject permanently discontinued study drug prior to 
Month 3.  The analysis of this endpoint is based on an “on treatment” approach.  An event will 
be considered as an “on-treatment” event if it occurred while on study drug or within 3 days of 
randomized study drug interruption or discontinuation. 
The time to “on-treatment” major and CRNM bleeding will be compared between treatment 
arms for subjects in the Safety Analysis Set, using the same Cox proportional hazards regression 
model as used for the primary efficacy analysis.  Subjects who did not have an event will be 
censored at 3 days after the day of permanent study treatment discontinuation, or at 3 month + 3 
days, or 6 to 12 weeks for Cohort 5, whichever occurred first.  
Similar analyses will be conducted for all bleeding, as categorized below, occurred from the date 
of the first dose of study drug to the date of the last dose of study drug + 30 days using the Safety 
Analysis Set.  Subjects who did not have corresponding event will be censored 30 days after the 
day of permanent study drug discontinuation. 
Bleeding events will be summarized and analyzed for the following categories: 
 Major and CRNM bleeding combined 
 Any bleeding (major, CRNM, and nuisance, combined) 
A sensitivity analysis will be conducted for major and CRNM bleeding, occurring while on-
treatment, from the date of the first dose of study drug to the date of the last dose of study drug + 
3 days during the whole study period.  Subjects who did not have corresponding event will be 
censored 3 days after the day of permanent study drug discontinuation. 
The incidence of bleeding events will also be summarized by treatment arm for on-treatment 
period up to 3 months + 3 days, on-treatment up to the date of last dose of study drug + 3 days, 
and from the date of the first dose of study drug to the date of the last dose of study drug + 30 
days, using Safety Analysis Set.  
11.4.3.2. Adverse Event Analyses 
Adverse events will be coded according to the Medical Dictionary for Regulatory Activities 
(MedDRA). 
Treatment-emergent AEs (TEAEs) are defined as AEs that occur, having been absent before the 
initial of study treatment, or worsen in severity after the initiation of study treatment 
administration.  Adverse events that start or worsen after the 30th day following the calendar 
date of the dose of the last study drug are defined as post-treatment AEs.  
The incidence of TEAEs will be presented for the Safety Analysis Set for the on treatment period 
and from the date of the first dose of study drug to the date of the last dose of study drug, 
respectively, by System Organ Class, by preferred term, and by treatment arm.  TEAEs will be 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 101 
further summarized by relationship to the study drug, and by severity.  Frequent TEAEs 
(reported by ≥5% of subjects in any treatment arm) will also be summarized by treatment arm for 
the on-treatment period and from the date of the first dose of study drug to the date of the last 
dose of study drug, respectively.  The incidence of death, SAEs, drug-related SAEs, and AEs 
leading to discontinuation of study drug will also be summarized.  All AEs will be included in a 
data listing and a listing to display the coding of AEs will be prepared as well. 
Similarly, the number and percentage of deaths, subjects reporting treatment-emergent SAEs, 
and TEAEs leading to discontinuation of study treatments will be tabulated. 
A by-subject AE (including treatment-emergent) data listing including but not limited to 
verbatim term, preferred term, system organ class, preferred term, and relationship to study drug 
will be provided.  Deaths, other SAEs, and other significant AEs, including those leading to 
discontinuation of study drug, will be listed. 
11.4.3.3. Clinical Laboratory Evaluation Analyses 
Descriptive statistics will be provided for the clinical laboratory results by scheduled time of 
evaluation and by treatment arm for the Safety Analysis Set, as well as for the change from 
baseline.  The baseline value is defined as the last non-missing value before the initial 
administration of study drug.  In addition, mean change from baseline will be presented by 
treatment arm for the maximum and minimum post-treatment values and the values at the 
Discontinuation Visit. 
Shift tables (in categories of low, normal, and high) will be provided for each treatment arm for 
selected clinical laboratory parameters.  Also, the number and percentage of subjects with 
clinically relevant abnormal clinical laboratory values while on study drug will be calculated for 
each treatment arm for selected clinical laboratory parameters.  All abnormal clinical laboratory 
values will be presented in a listing.  Specifically, the number and percentage of subjects with 
elevation of liver enzymes (ALT, AST) and TBL, according to various multiples of ULN will be 
summarized by treatment arm.  The number and percentage of subjects with concurrent elevation 
of ALT or AST ≥3 × ULN and TBL ≥2 × ULN will also be summarized by treatment arm.   
11.4.3.4. Vital Sign Analyses 
Descriptive statistics will be provided for the vital signs measurements by scheduled time of 
evaluation and by treatment arm for the Safety Analysis Set, as well as for the change from 
baseline.  The baseline value is defined as the last non-missing value before the initial 
administration of study drug. 
11.4.3.5. Physical Examination Analyses 
A listing of physical examination data will also be provided. 
11.4.3.6. Other Analysis 
Any additional exploratory analysis will be specified in the SAP. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 102 
11.5. 
Interim Analyses 
An interim assessment of incidence rate of the composite efficacy endpoint in both treatment 
arms of the study will take place after first 140 subjects (about 50% of subjects) complete the 
first 3 months of treatment.  This will allow for adjustment of number of subjects in the study if 
necessary.  Because the sample size re-estimation will be based on overall event rate acrossing 
two treatment arms, no type I error adjustment is needed for this interim analysis. The detailed 
interim analysis will be specified in interim SAP (IASAP). 
11.5.1. 
Independent Data Monitoring Committee 
An Independent Data Monitoring Committee will monitor the safety data throughout the study 
and inform the Study Steering Committee on fixed intervals and will be detailed in DMC charter. 
11.6. 
Sample Size Determination 
This is an event driven trial and the total number of subjects randomized to treatment may be 
adjusted to ensure accumulation of 68 events in the mITT Analysis Set during the Main 
Treatment Period. 
The sample size calculation is based on statistical approach and results of Hokusai VTE study 
(DU176b-D-U305), a study of LMWH/edoxaban versus LMWH/warfarin in the treatment of 
acute VTE in adults.  An NI margin of 1.5 (in hazard ratio) is used in the Hokusai VTE study and 
was aimed at preserving 70% of warfarin effect in adult population.  A hazard ratio of 0.76 of 
recurrent VTE between edoxaban and warfarin for the first 3 months is also observed in Hokusai 
VTE study. 
This pediatric study is designed to accumulate, approximately 68 overall primary efficacy events 
in the mITT Analysis Set during the Main Treatment Period.  Assuming that edoxaban group 
will observe a 24% relative reduction to SOC arm, a total of 68 events will give approximately a 
power of 80% to demonstrate that LMWH/edoxaban is non-inferior to the comparator, 
considering a relative non-inferiority margin for the hazard ratio of 1.5 (two-sided α=0.05). 
Based on the completed clinical trials and literature review4, 14, 15, 16, 19, 22, 23, 24, 25, we expect an 
incidence of composite primary efficacy endpoint of 28% in the control arm during the Main 
Treatment Period.  Based on these estimates, 274 subjects (137 each arm) are expected to be 
randomized to study drug in order to accrue 68 primary efficacy events in the mITT Analysis Set 
during the Main Treatment Period.   
11.7. 
Statistical Analysis Process 
The data analysis will be performed by a CRO under the guidance of the study biostatistician.   
The SAP will provide the statistical methods and definitions for the analysis of the efficacy and 
safety data, as well as describe the approaches to be taken for summarizing other clinical study 
information such as subject disposition, demographic and baseline characteristics, study drug 
exposure, and prior and concomitant medications.  The SAP will also include a description of 
how missing, unused, and spurious data will be addressed. 
To preserve the integrity of the statistical analysis and clinical study conclusions, the SAP will be 
finalized prior to database lock. 
All statistical analyses will be performed using SAS® Version 9.2 or higher. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 103 
12. 
DATA INTEGRITY AND QUALITY ASSURANCE 
12.1. 
Monitoring and Inspections 
The sponsor or designee’s monitor and regulatory authority inspectors are responsible for 
contacting and visiting the Investigator for the purpose of inspecting the facilities and, upon 
request, inspecting the various records of the study (eg, CRFs, source data, and other pertinent 
documents). 
The verification of adherence to the protocol; completeness, accuracy, and consistency of the 
data; and adherence to ICH GCP and local regulations on the conduct of clinical research will be 
accomplished through a combination of onsite visits by the monitor and review of study data 
remotely.  The frequency of the monitoring visit will vary based on the activity at each study 
site.  The monitor is responsible for inspecting the CRFs and ensuring completeness of the study 
essential documents.  The monitor should have access to subject medical records and other 
study-related records needed to verify the entries on the CRFs.  Detailed information is provided 
in the monitoring plan. 
The monitor will communicate deviations from the protocol, SOPs, GCP and applicable 
regulations to the Investigator and will ensure that appropriate action (s) designed to prevent 
recurrence of the detected deviations is taken and documented. 
The Investigator agrees to cooperate with the monitor to ensure that any problems detected in the 
course of these monitoring visits are addressed to the satisfaction of the sponsor and 
documented. 
In accordance with ICH GCP and the Sponsor’s audit plans, this study may be selected for audit 
by representatives from the Sponsor.  Audit of study center facilities (eg, pharmacy, drug storage 
areas, laboratories) and review of study related records will occur in order to evaluate the study 
conduct and compliance with the protocol, ICH GCP, and applicable regulatory requirements.  
The Investigator should respond to audit findings.  In the event that a regulatory authority 
informs the Investigator that it intends to conduct an inspection, the Sponsor shall be notified 
immediately. 
12.2. 
Data Collection 
This study employs electronic data capture.  The eCRF should be kept current to enable the 
monitor to review the subject’s status throughout the course of the study.  The eCRF will be 
completed, reviewed, and electronically signed by the Investigator.  Guidelines will be provided 
to facilitate data entry in the electronic data capture modules. 
All written information, study notes, and other material to be used by subjects and investigative 
staff must use vocabulary and language that are clearly understood as source documentation. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 104 
12.3. 
Data Management 
Each subject will be identified in the database by a unique subject identifier as defined by the 
sponsor. 
To ensure the quality of clinical data across all subjects and study centers, a Clinical Data 
Management review will be performed on subject data according to specifications given by the 
sponsor or designee’s.  Data will be vetted both electronically and manually for CRFs and the 
data will be electronically vetted by programmed data rules within the application.  Queries 
generated by rules and raised by reviewers will be generated within the EDC application.  During 
this review, subject data will be checked for consistency, completeness and any apparent 
discrepancies.   
Data received from external sources such as central laboratories will be reconciled to the clinical 
database. 
Serious Adverse Events in the clinical database will be reconciled with the safety database. 
All medical history entries (except terms pre-specified on the eCRF) and adverse events will be 
coded using MedDRA.  All prior and concomitant medications will be coded using WHO Drug 
Dictionary. 
12.4. 
Study Documentation and Storage 
The Investigator will maintain a Signature List of appropriately qualified persons to whom 
he/she has delegated study duties.  All persons authorized to make entries and/or corrections on 
electronic CRFs will be included on the Signature List. 
Investigators will maintain a confidential screening log of all potential study candidates that 
includes limited information of the subjects, date and outcome of screening process. 
Investigators will be expected to maintain an Enrollment Log of all subjects enrolled in the study 
indicating their assigned study number. 
Investigators will maintain a confidential subject identification code list.  This confidential list of 
names of all subjects allocated to study numbers on enrolling in the study allows the Investigator 
to reveal the identity of any subject when necessary. 
Source documents are original documents, data, and records from which the subject’s CRF data 
are obtained.  These include but are not limited to hospital records, clinical and office charts, 
laboratory and pharmacy records, diaries, microfiches, X-rays, and correspondence. 
Records of subjects, source documents, monitoring visit logs, data correction forms, CRFs, 
inventory of study drug, regulatory documents (eg, protocol and amendments, IRB/EC 
correspondence and approvals, approved and signed informed consent forms, Investigator’s 
Agreement, clinical supplies receipts, distribution and return records), and other sponsor 
correspondence pertaining to the study must be kept in appropriate study files at the study center 
(Trial Master File).  Source documents include all recordings and observations or notations of 
clinical activities and all reports and records necessary for the evaluation and reconstruction of 
the clinical study.  These records will be retained in a secure file for the period required by the 
institution or study center policy.  Prior to transfer or destruction of these records, the Sponsor 
must be notified in writing and be given the opportunity to further store such records. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 105 
12.5. 
Record Keeping 
The Investigator and study staff are responsible for maintaining a comprehensive and centralized 
filing system (Trial Master File) of all study-related (essential) documentation, suitable for 
inspection at any time by representatives from the Sponsor and/or applicable regulatory 
authorities.  Essential documents include: 
 Subject files containing completed CRFs, informed consent forms, and supporting 
copies of source documentation (if kept). 
 Study files containing the protocol with all amendments, Investigator’s Brochure, 
copies of relevant essential documents required prior to commencing a clinical study, 
and all correspondence to and from the EC/IRB and the Sponsor. 
 Records related to the study drug(s) including acknowledgment of receipt at study 
center, accountability records and final reconciliation and applicable correspondence. 
In addition, all original source documents supporting entries in the CRFs must be maintained and 
be readily available. 
All essential documentation will be retained by the institution until told otherwise by the 
sponsor. 
No study document should be destroyed without prior written agreement between the sponsor 
and the Investigator.  Should the Investigator wish to assign the study records to another party or 
move them to another location, he/she must notify the sponsor in writing of the new responsible 
person and/or the new location. 
All Investigators and site personnel must ensure subject confidentiality as outlined in 
Section 15.2. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 106 
13. 
FINANCING AND INSURANCE 
13.1. 
Finances 
Prior to starting the study, the Principal Investigator and/or institution will sign a clinical study 
agreement with the CRO.  This agreement will include the financial information agreed upon by 
the parties. 
13.2. 
Reimbursement, Indemnity, and Insurance 
The Sponsor provides insurance for study subjects to make available compensation in case of 
study related injury. 
Reimbursement, indemnity and insurance shall be addressed in a separate agreement on terms 
agreed upon by the parties. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 107 
14. 
PUBLICATION POLICY 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 108 
15. 
ETHICS AND STUDY ADMINISTRATIVE INFORMATION 
15.1. 
Compliance Statement, Ethics and Regulatory Compliance 
This study will be conducted in compliance with the protocol, the ethical principles that have 
their origin in the Declaration of Helsinki, the International Conference on Harmonisation (ICH) 
consolidated Guideline E6 for Good Clinical Practice (GCP) (CPMP/ICH/135/95), and 
applicable regulatory requirement(s) including the following: 
 European Commission Directive (2001/20/EC Apr 2001) and/or; 
 European Commission Directive (2005/28/EC Apr 2005) and/or; 
 US Food and Drug Administration (FDA) GCP Regulations: Code of Federal 
Regulations (CFR) Title 21, parts 11, 50, 54, 56 and 312 as appropriate and/or; 
 Japanese Ministry of Health, Labor and Welfare Ordinance No. 28 of 27 March, 1997 
and/or; 
 The Act on Securing Quality, Efficacy and Safety of Pharmaceuticals, Medical 
Devices, Regenerative and Cellular Therapy Products, Gene Therapy Products, and 
Cosmetics No. 1 of 25 November, 2014; 
 Other applicable local regulations. 
15.2. 
Subject Confidentiality 
The Investigators and the Sponsor will preserve the confidentiality of all subjects taking part in 
the study, in accordance with GCP and local regulations. 
The Investigator must ensure that the subject’s anonymity is maintained.  On the CRFs or other 
documents submitted to the Sponsor or the CRO, subjects should be identified by a unique 
subject identifier as designated by the Sponsor.  Documents that are not for submission to the 
Sponsor or the CRO (eg, signed ICF) should be kept in strict confidence by the Investigator. 
In compliance with ICH GCP Guidelines, it is required that the Investigator and institution 
permit authorized representatives of the company, of the regulatory agency(s), and the IRB/EC 
direct access to review the subject’s original medical records for verification of study-related 
procedures and data.  The Investigator is obligated to inform the subject that his/her study-related 
records will be reviewed by the above named representatives without violating the 
confidentiality of the subject. 
15.3. 
Informed Consent  
Before a subject’s participation in the study, it is the Investigator’s responsibility to obtain freely 
given consent and assent, in writing, from the subject after adequate explanation of the aims, 
methods, anticipated benefits, and potential hazards of the study and before any protocol-specific 
procedures or any study drugs are administered.  Subjects should be given the opportunity to ask 
questions and receive satisfactory answers to their inquiries, and should have adequate time to 
decide whether or not to participate in the study.  The written ICF should be prepared in the local 
language(s) of the potential subject population. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 109 
In obtaining and documenting informed consent, the Investigator should comply with the 
applicable regulatory requirements, and should adhere to GCP and to the ethical principles that 
have their origin in the Declaration of Helsinki.  The consent form and any revision(s) should be 
approved by the EC or IRB prior to being provided to potential subjects. 
The subject’s written informed consent along with the legal guardian(s) should be documented in 
the subject’s medical records.  The ICF should be signed and personally dated by the subject and 
by the person who conducted the informed consent discussion (not necessarily the Investigator).  
The original signed ICF should be retained in accordance with institutional policy, and a copy of 
the signed consent form should be provided to the subject.  The date and time (if applicable) that 
informed consent was given should be recorded on the CRF. 
Suggested model text for the ICF and assent for the study and any applicable subparts (genomic, 
PK, etc.) are provided in the Sponsor’s ICF template for the Investigator to prepare the 
documents to be used at his or her study center.  Updates to applicable forms will be 
communicated via letter from the Sponsor. 
For studies in the US, an additional consent is required for the Health Insurance Portability and 
Accountability Act (HIPAA). 
According to 21 CFR 50.55 subpart b it states, “In determining whether children are capable of 
providing assent, the IRB must take into account the ages, maturity, and psychological state of 
the children involved.  This judgment may be made for all children involved in clinical 
investigations under a particular protocol, or for each child, as the IRB deems appropriate.”  In 
21 CFR 50.55 subpart g it states, “When the IRB determines that assent is required, it must also 
determine whether and how assent must be documented.”  For this study, the IRB will determine 
the age that is appropriate for the assent.  Generally, this age averages at 7 years of age.  The IRB 
will also determine the verbiage that may be added, as well as ensure the document is written at a 
level understandable to the population who will be signing the assent.  The IRB may also require 
separate assent forms based on the age groups (ie, separate assent forms for subjects 7 to 12 
years and for subjects 13 to 17 years) to ensure the assents maintain their “maturity levels and 
understandability”. 
15.4. 
Regulatory Compliance 
The study protocol, subject information and consent form, the Investigator Brochure, any subject 
written instructions to be given to the subject, available safety information, subject recruitment 
procedures (eg, advertisements), information about payments and compensation available to the 
subjects, and documentation evidencing the Investigator’s qualifications should be submitted to 
the EC or IRB for ethical review and approval according to local regulations, prior to the study 
start.  The written approval should identify all documents reviewed by name and version. 
Changes in the conduct of the study or planned analysis will be documented in a protocol 
amendment and/or the SAP. 
The Investigator must submit and, where necessary, obtain approval from the EC or IRB for all 
subsequent protocol amendments and changes to the ICF.  The Investigator should notify the EC 
or IRB of deviations from the protocol or SAEs occurring at the study center and other AE 
reports received from the Sponsor/CRO, in accordance with local procedures. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 110 
As required by local regulations, the Sponsor’s local Regulatory Affairs group or representative 
to whom this responsibility has been delegated will ensure all legal aspects are covered, and 
approval from the appropriate regulatory bodies obtained, prior to study initiation, and that 
implementation of changes to the initial protocol and other relevant study documents happen 
only after approval by the relevant regulatory bodies. 
In the event of any prohibition or restriction imposed (eg, clinical hold) by an applicable 
Regulatory Authorities in any area of the world, or if the Investigator is aware of any new 
information which might influence the evaluation of the benefits and risks of the investigational 
drug, the Sponsor should be informed immediately.   
In addition, the Investigator will inform the Sponsor immediately of any urgent safety measures 
taken by the Investigator to protect the study subjects against any immediate hazard, and of any 
suspected/actual serious GCP non-compliance that the Investigator becomes aware of. 
15.5. 
Protocol Deviations 
The Investigator should conduct the study in compliance with the protocol agreed to by Sponsor 
and, if required, by the regulatory authority (is), and which was given approval/favorable opinion 
by the IRBs/ECs. 
A deviation to any protocol procedure or waiver to any stated criteria will not be allowed in this 
study except where necessary to eliminate immediate hazard(s) to the subject.  Sponsor must be 
notified of all intended or unintended deviations to the protocol (eg, inclusion/exclusion criteria, 
dosing, missed study visits) on an expedited basis. 
The Investigator, or person designated by the Investigator, should document and explain any 
deviation from the approved protocol. 
If a subject was ineligible or received the incorrect dose or study treatment, and had at least 1 
administration of study drug, data should be collected for safety purposes. 
If applicable, the Investigator should notify the IRB/IEC of deviations from the protocol in 
accordance with local procedures. 
15.6. 
Supply of New Information Affecting the Conduct of the Study 
When new information becomes available that may adversely affect the safety of subjects or the 
conduct of the study, the Sponsor will inform all Investigators involved in the clinical study, 
ECs/IRBs, and regulatory authorities of such information, and when needed, will amend the 
protocol and/or subject information. 
The Investigator should immediately inform the subject whenever new information becomes 
available that may be relevant to the subject’s consent or may influence the subject’s willingness 
to continue participation in the study.  The communication should be documented on medical 
records, for example, and it should be confirmed whether the subject is willing to remain in the 
study.  
If the subject information is revised, it must be re-approved by the IEC/IRB.  The Investigator 
should obtain written informed consent to continue participation with the revised written 
information even if subjects were already informed of the relevant information.  The Investigator 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 111 
or other responsible personnel who provided explanations and the subject should sign and date 
the revised ICF. 
15.7. 
Protocol Amendments 
Any amendments to the study protocol that seem to be appropriate as the study progresses will 
be communicated to the Investigator by Daiichi Sankyo or the CRO.  Also, the Sponsor will 
ensure the timely submission of amendments to regulatory authorities. 
A global protocol amendment will affect study conduct at all study centers in all regions of the 
world.  Such amendments will be incorporated into a revised protocol document.  Changes made 
by such amendments will be documented in a Summary of Changes added as either a section to 
the new version or provided as a separate document.  These protocol amendments will undergo 
the same review and approval process as the original protocol.   
A local protocol amendment will affect study conduct at a particular study center(s) and/or in a 
particular region/country.  Sponsor approval of local amendments will be clearly documented. 
A protocol amendment may be implemented after it has been approved by the IRB/EC and by 
regulatory authorities where appropriate, unless immediate implementation of the change is 
necessary for subject safety. 
15.8. 
Study Termination 
The IDMC may recommend termination of the study.  Termination may be made for any of the 
following reasons: 
 Concern about significantly higher bleeding risk relative to one of the study arms, 
 Concern about drug-induced liver injury, 
 Any other safety concern based on benefit/risk evaluation. 
The IDMC will alert the Investigator/designee if there are any of the above concerns requiring 
protocol modifications or any other changes in the study. 
The details about the roles and responsibilities of the IDMC and guidelines and rules for 
monitoring the study safety data will be described further in the IDMC charter. 
15.9. 
Independent Data Monitoring Committee (IDMC) 
An IDMC will be created to further protect the rights, safety, and well-being of subjects who will 
be participating in this study by monitoring their progress and results.  The IDMC will comprise 
of qualified scientists, who are not Investigators in the study and not otherwise directly 
associated with the Sponsor.  The IDMC will be described in detail in the IDMC Charter.  The 
IDMC will monitor data during the study.  All activities of the IDMC will be documented.  This 
documentation will include data summaries and analyses provided to the committee as well as 
minutes of the meeting.  The IDMC can recommend study or treatment regimen/group 
termination to a study oversight committee based on pre-specified concerns described in the 
IDMC Charter.  

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 112 
An independent CRO study statistician will prepare the required data outputs and provide the 
outputs to the IDMC as per the IDMC charter.  The statistician will prepare overall summary 
reports for the data including, but not limited to, subject disposition, subject demographics and 
baseline characteristics, subject treatment duration, subjects with bleeding (adjudicated by the 
CEC), subjects with liver enzyme and bilirubin abnormalities, subjects with SAEs, deaths, 
subjects permanently discontinued from study drug due to AEs, and subjects with efficacy 
endpoints such as VTE and CV mortality, and all-cause mortality etc.  The PK and safety data 
will be reviewed by the IDMC who will approve the start of the next younger age cohort.  
An interim assessment of incidence rate of the composite efficacy endpoint in both arms of the 
study will take place after first 140 subjects (about 50% of subjects) complete the first 3 months 
of treatment.  This will allow for adjustment of number of subjects in the study if necessary.  
15.10. 
Clinical Events Committee 
A blinded independent study specific CEC will review and adjudicate key endpoint events: all 
deaths, VTEs, thrombotic burden, and other suspected efficacy endpoints, overt bleeding events 
that require medical attention, and liver enzyme abnormalities meeting predefined criteria 
(including all suspected clinical endpoint events from subjects who permanently discontinued 
study drug).  Endpoints reported during telephone contacts will also be adjudicated.   
An additional independent members of the CEC will be a radiologist who will assess the baseline 
index VTE image and follow-up image at Month 3 and Month 12/ Discontinuation visit (if 
applicable).  Quantitative assessment of the change in thrombotic burden of the index VTE will 
be made. 
The CEC will comprise qualified judges, who are not Investigators in the study and not 
otherwise directly associated with the Sponsor.  The CEC judges will remain blinded to 
treatment throughout the adjudication process and the study.  The CEC-adjudicated data will be 
used in the final efficacy and safety analyses.  The CEC and the events and radiologic images it 
will adjudicate will be detailed in the CEC Charter. 
15.11. 
Steering Committee/Executive Committee 
A Study Steering Committee will be created to provide clinical guidance on study 
implementation and conduct of the study, and interpretation of results as specified in the 
Committee Charter.  It will consist of Principal Investigator(s), and key opinion leaders 
participating in the study (as requested), as well as designated Sponsor and CRO members. 
15.12. 
Address List 
A list of key study personnel (including personnel at the sponsor, CRO, laboratories, and other 
vendors) and their contact information (address, telephone, fax, email) will be kept on file and 
updated in the Study Reference Manual. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 113 
15.12.1. 
Sponsor 
Daiichi Sankyo, Inc. 
211 Mount Airy Road 
Basking Ridge, NJ 07920 USA 
United States. 
15.12.2. 
Contract Research Organization 
IQVIA 
5927 South Miami Boulevard 
Morrisville, NC 27560 
United States. 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 114 
16. 
REFERENCES 
1. Andrew M, David M, Adams M, et al. Venous thromboembolic complications (VTE) in 
children: first analyses of the Canadian Registry of VTE. Blood. 1994;83:1251-7. 
2. Nowak-Göttl U, von Kries R, Göbel U. Neonatal symptomatic thromboembolism in 
Germany: two year survey. Arch Dis Child Fetal Neonatal Ed. 1997;76:F163-7. 
3. Van Ommen CH, Heijboer H, Büller HR, et al. Venous thromboembolism in childhood: a 
prospective two-year registry in The Netherlands. J Pediatr. 2001;139:676-81. 
4. Van Ommen CH, Heijboer H, van den Dool EJ, et al. Pediatric venous thromboembolic 
disease in one single center: congenital prothrombotic disorders and the clinical outcome. 
J Thromb Haemost. 2003;1:2516-22. 
5. Journeycake JM, Buchanan GR. Thrombotic complications of central venous catheters in 
children. Curr Opin Hematol. 2003;10:369-74. 
6. Andrew M, Marzinotto V, Pencharz P, et al. A cross-sectional study of catheter-related 
thrombosis in children receiving total parenteral nutrition at home. J Pediatr. 
1995;126:358-63. 
7. Miga DE, McKellar LF, Denslow S, et al. Incidence of femoral vein occlusion after 
catheter ablation in children: evaluation with magnetic resonance angiography. Pediatr 
Cardiol. 1997;18:204-7. 
8. Journeycake JM, Buchanan GR. Catheter-related deep vein thrombosis and other 
catheter-related complications in children with cancer. J Clin Oncol. 2006;24:4575-80. 
9. Young G, Albisetti M, Bonduel M, et al. Impact of inherited thrombophilia on venous 
thromboembolism in children. A systematic review and meta-analysis of observational 
studies. Circulation. 2008;Sep 23;118(13):1373-82. 
10. Raffini LJ, Huang YS, Witmer C, Feudtner C. Dramatic increase in venous 
thromboembolism in children's hospitals in the United States from 2001 to 2007. 
Pediatrics. 2009;124:1001-8. 
11. Monagle P, Chalmers E, Chan A, et al. Antithrombotic therapy in neonates and children: 
American College of Chest Physicians Evidence-Based Clinical Practice Guidelines (8th 
Edition). Chest. 2008;133:887S-968S. 
12. Young G. New anticoagulants in children. Hematology. 2008;245-50. 
13. Ko RH, Michieli C, Lira JL, Young G. FondaKIDS II: Long-term follow-up data of 
children receiving fondaparinux for treatment of venous thromboembolic events. 
Thrombosis Research 134 (2014) 643-647.   
14. Massicotte P, Julian JA, Gent M, et al. An open-label randomized controlled trial of low 
molecular weight heparin compared to heparin and coumadin for the treatment of venous 
thromboembolic events in children: the REVIVE trial. Thromb Res. 2003;109:85-92. 
15. Monagle P, Adams M, Mahoney M, et al. Outcome of pediatric thromboembolic disease: 
a report from the Canadian Childhood Thrombophilia Registry. Pediatr Res. 
2000;47:763-6. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 115 
16. Merkel N, Gunther G, Schobess R. Long-term treatment of thrombosis with enoxaparin 
in pediatric and adolescent patients. Acta Haematol. 2006;115:230-6. 
17. Newall F, Wallace T, Crock C, et al. Venous thromboembolic disease: a single-centre 
case series study. J Paediatr Child Health. 2006; 42:803-7. 
18. Goldenberg NA, Donadini MP, Kahn SR, et al. Post-thrombotic syndrome in children: a 
systematic review of frequency of occurrence, validity of outcome measures, and 
prognostic factors. Haematologica. 2010;95(11):1952-9. 
19. Kuhle S, Koloshuk B, Marzinotto V, et al. A cross-sectional study evaluating post-
thrombotic syndrome in children. Thrombosis Res. 2003;111:227-33. 
20. Monagle P, Cochrane A, Roberts R, et al. A multicenter, randomized trial comparing 
heparin/warfarin and acetylsalicylic acid as primary thromboprophylaxis for 2 years after 
the Fontan procedure in children. J Am Coll Cardiol. 2011;58(6):645-51. 
21. Schulman S, Kearon C, Subcommittee on Control of Anticoagulation of the Scientific 
and Standardization Committee of the International Society on Thrombosis and 
Haemostasis.  Definition of major bleeding in clinical investigations of antihemostatic 
medicinal products in non-surgical patients.  J Thromb Haemost 2005; (3)692–4. 
22. Revel-Vilk S, Sharathkumar A, Massicotte P, Marzinotto V, Daneman A, Dix D, et al. 
Natural history of arterial and venous thrombosis in children treated with low molecular 
weight heparin: a longitudinal study by ultrasound. J Thromb Haemost, 2004;2:42-6 
23. Tousovska K, Zapletal O, Skotakova J, Bukac J, Sterba J. Treatment of deep venous 
thrombosis with low molecular weight heparin in pediatric cancer patients: safety and 
efficacy; Blood Coagulation and Fibrinolysis 2009, 20:583–589 
24. Sirachainan N, Chuansumrit A, Angchaisuksiri P, Pakakasama S, Hongeng S, 
Kadegasem P. Venous Thromboembolism in Thai children, Pediatric Hematology and 
Oncology, 24:245–256, 2007 
25. Tuckuviene R, Christensen AL, Helgestad J, Johnsen SP, Kristensen SR. Pediatric 
Venous and Arterial Noncerebral Thromboemboslim in Denmark: A Nationwide 
Population-Based Study. J of Pediatrics, 2011; 159: 663-669 
26. Monagle P, Chan AKC, Goldenberg NA, Ichord RN, Journeycake JM, Nowak-Göttl U, et 
al. Antithrombotic Therapy in Neonates and Children: Antithrombotic Therapy and 
Prevention of Thrombosis, 9th: American College of Chest Physicians Edition: Evidence-
Based Clinical Practice Guidelines. Chest 2012: 141 (2) (suppl): e737S-e801S. 
27. Rodeghiero F, Tosetto A, Abshire T, Arnold DM, Coller B, James P, Neunert C, Lillicrap 
D, ISTH/SSC joint VWF and Perinatal/Pediatric Hemostasis Subcommittees Working 
Group.  ISTH/SSC bleeding assessment tool: a standardized questionnaire and a proposal 
for a new bleeding score for inherited bleeding disorders.  J Thromb Haemost 2010; 8: 
2063–5. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 116 
17. 
APPENDICES 
17.1. 
Schedule of Events 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 117 
Table 17.1: 
Schedule of Events 
Study Period 
Screening/ 
Qualification Visit 
Randomizationa On-Treatment Study Visits 
Required 
30 Day 
Follow-
Up Visitb 
Main Treatment Period 
 
Extension Period (Optional) 
Visit Number  
1 
2 
2a 
3 
4 
5 
6 
7 
8 
9 
Study Day 
At least Day-5 to -1 
Index VTE Event 
Identified 
Pre-randomization 
treatment selected 
by PI (LMWH or SP 
Xa inhibitor or 
UFH) 
Day 1 
1st EDX Dose 
Day 5 
EDX 
arm 
only  
N=53 to 
60 
Month 1 Month 2 Month 3 Month 6 Month 9 Month 12/ 
Discontinuation 
Visit 
 
Visit Window (Days)c  
 
+3 
±5 
±5 
±5 
±5 
±5 
±5 
±5 
IXRS transaction 
X 
 
 
 
 
 
 
 
 
 
IXRS Randomization  
X 
 
 
 
 
 
 
 
 
Study Informed 
Consent 
X 
 
 
 
 
 
 
 
 
 
Confirm Diagnosis of 
Index VTE 
X 
 
 
 
 
 
 
 
 
 
Inclusion/Exclusion 
Criteria 
X 
 
 
 
 
 
 
 
 
 
Demographic 
Information 
X 
 
 
 
 
 
 
 
 
 
Medical/Surgical 
History 
X 
 
 
 
 
 
 
 
 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 118 
Table 17.1: 
Schedule of Events (Continued) 
Study Period 
Screening/ 
Qualification Visit 
Randomizationa On-Treatment Study Visits 
Required 
30 Day 
Follow-
Up Visitb 
Main Treatment Period 
 
Extension Period (Optional) 
Visit Number  
1 
2 
2a 
3 
4 
5 
6 
7 
8 
9 
Study Day 
At least Day-5 to -1 
Index VTE Event 
Identified 
Pre-randomization 
treatment selected 
by PI (LMWH or SP 
Xa inhibitor or 
UFH) 
Day 1 
1st EDX Dose 
Day 5 
EDX 
arm 
only  
N=53 to 
60 
Month 1 Month 2 Month 3 Month 6 Month 9 Month 12/ 
Discontinuation 
Visit 
 
Physical 
Examination and 
Body Height/Weight 
Assessmentsd 
X 
 
 
X 
X 
X 
X 
X 
X 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 119 
Table 17.1: 
Schedule of Events (Continued) 
Study Period 
Screening/ 
Qualification Visit 
Randomizationa On-Treatment Study Visits 
Required 
30 Day 
Follow-
Up Visitb 
Main Treatment Period 
 
Extension Period (Optional) 
Visit Number  
1 
2 
2a 
3 
4 
5 
6 
7 
8 
9 
Study Day 
At least Day-5 to -1 
Index VTE Event 
Identified 
Pre-randomization 
treatment selected 
by PI (LMWH or SP 
Xa inhibitor or 
UFH) 
Day 1 
1st EDX Dose 
Day 5 
EDX 
arm 
only  
N=53 to 
60 
Month 1 Month 2 Month 3 Month 6 Month 9 Month 12/ 
Discontinuation 
Visit 
 
Vital Signse 
X 
 
 
X 
X 
X 
X 
X 
X 
 
Liver function 
assessment (ALT, 
AST, TBL, ALP) 
X** 
 
 
X 
 
X 
 
X 
X 
 
Serum Creatinine 
X** 
 
Xo 
X 
 
X 
X 
X 
X 
 
Serum Chemistry 
Panel excluding 
creatinine 
X** 
 
Xo 
 
 
 
 
 
 
 
Screening only: 
INR Measurement 
on VKA and aPTT 
X 
 
 
Post-randomization: 
INR, Anti-FXa, 
aPTT, assessment on 
SOCf,g  
 
……………………………………......…….…  X  
……………………....……………………………… 
Hematology 
X** 
 
 
 
 
X 
 
 
X 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 120 
Table 17.1: 
Schedule of Events (Continued) 
Study Period 
Screening/ 
Qualification Visit 
Randomizationa On-Treatment Study Visits 
Required 
30 Day 
Follow-
Up Visitb 
Main Treatment Period 
 
Extension Period (Optional) 
Visit Number  
1 
2 
2a 
3 
4 
5 
6 
7 
8 
9 
Study Day 
At least Day-5 to -1 
Index VTE Event 
Identified 
Pre-randomization 
treatment selected 
by PI (LMWH or SP 
Xa inhibitor or 
UFH) 
Day 1 
1st EDX Dose 
Day 5 
EDX 
arm 
only  
N=53 to 
60 
Month 1 Month 2 Month 3 Month 6 Month 9 Month 12/ 
Discontinuation 
Visit 
 
PK/PD assessment 
for first 12 subjects 
in each age cohort in 
EDX arm (see 
Section 8)  
 
 
X 
 
 
 
 
 
 
 
VTE Radiologic 
Imagingh 
X 
 
 
 
 
Xn 
 
 
X 
 
Urinalysis 
X 
 
 
 
 
 
 
 
 
 
Urine Pregnancy  
Testi 
X 
X 
 
 
 
X 
 
 
X 
 
AE/SAE Reportingj 
……………………………………………..………………  X  
……………………………………………………….……………………… 
Endpoints Reporting 
(VTE, Bleeding)k  
…………………………………………………...………… X 
……….………………………….…………………………………………… 
Prior and 
Concomitant 
Medicationsl 
X 
X 
 
X 
X 
X 
X 
X 
X 
X 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 121 
Table 17.1: 
Schedule of Events (Continued) 
Study Period 
Screening/ 
Qualification Visit 
Randomizationa On-Treatment Study Visits 
Required 
30 Day 
Follow-
Up Visitb 
Main Treatment Period 
 
Extension Period (Optional) 
Visit Number  
1 
2 
2a 
3 
4 
5 
6 
7 
8 
9 
Study Day 
At least Day-5 to -1 
Index VTE Event 
Identified 
Pre-randomization 
treatment selected 
by PI (LMWH or SP 
Xa inhibitor or 
UFH) 
Day 1 
1st EDX Dose 
Day 5 
EDX 
arm 
only  
N=53 to 
60 
Month 1 Month 2 Month 3 Month 6 Month 9 Month 12/ 
Discontinuation 
Visit 
 
Study Drug 
Dispensing via IXRS 
will occur on a 
monthly basis unless 
locally sourced then 
no IXRS updatesm 
 
………………………………..........……  X  
…………....…………...……………… 
 
 
Study Drug 
Compliance will 
occur on a monthly 
basis or every 3 
months (in extension 
phase) basis from 
returned study drugm 
 
 
……………………….………...………  X  
……………………….………………… 
 
Abbreviations: AE = adverse event; ALP = alkaline phosphatase; ALT = alanine transaminase; aPTT = activated partial thromboplastin time; AST = aspartate 
transaminase; EDX = edoxaban; FXa = activated factor X; INR = International Normalized Ratio; IXRS = interactive web/voice response system; LMWH = 
Low molecular weight heparin; PD = pharmacodynamics; PK = pharmacokinetics; PI = Principal Investigator; SOC = standard of care; SP = Synthetic 
Pentasaccharide, TBL = total bilirubin level; UFH = unfractionated heparin; VKA = vitamin K antagonist; VTE = venous thromboembolism. 
**Samples taken as part of routine care outside the study requirements may be analyzed by local laboratories and the results used to qualify the subject provided 
the tests were performed for the newly diagnosed index VTE before randomization.  If central laboratory is also used at the same visit with a resulting 
discrepancy for exclusion criteria, the local laboratory result will still be used to qualify the subject. 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 122 
a Randomization may occur in IXRS the day prior to dosing for clinical logistics. 
b Follow-Up Visit will be performed 1 month after the subject completes the study (6 weeks - Month 3 or Month 12 or 30 days after discontinuation from study in 
the extension period).  
c Scheduling of visits within windows should be done with caution to the drug supply available in a dispensing unit.  PK/PD assessment on Day 5 cannot be 
performed before Day 5. 
d Targeted physical examination performed by an Investigator or other healthcare professional designated by the Investigator.  
e Vital signs include heart rate, body temperature, and sitting or supine blood pressure (Section 9.9). 
f INR assessment for adjustment of VKA dosages will be performed every month as per SOC. Additional interim evaluations may be performed at the discretion 
of the Investigator.  INR will be assessed at Screening/Qualification visit if prior VKA was given or to be taken.  
g Investigator discretionary assessment of anti-FXa to be performed to determine if SP or LMWH are at therapeutic levels. 
h If image was taken for recurrent VTE after Month 3 but before discontinuation, then no image is needed at Month 12/Discontinuation.  Optional Month 3 
imaging can be done if recurrent VTE occurs prior to Month 3. 
i Highly sensitive urine pregnancy test to be performed for females of childbearing potential. 
j AE/SAE reporting should occur throughout the study and not be restricted to specific visits. 
k Endpoint events should be reported as soon as site personal learn of the event. Endpoint event should occur throughout the study and not be restricted to specific 
visits. 
l Prior medications includes 30 days prior to Screening/Qualification visit. 
m There is no dispensing or drug accountability requirement for Visit 2a for edoxaban arm for those subjects enrolled in the PK/PD evaluation because drug is 
expected to be dispensed on a monthly basis.  The subject will need to bring in his/her edoxaban therapy for a single dosing treatment. 
n For subjects in Cohort 5, a radiologic VTE image will be taken at the end of the intended treatment period (at least 6 to 12 weeks) or at the discontinuation visit 
if anticoagulant treatment is received for <3 months. 
o Renal function test should be performed on or around Day 5 visit (at the same time of PK sampling).  
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 123 
17.2. 
Additional Information on Investigational Product Use in Pediatric 
Subjects 
Recommendations per CHEST 2012 Guidelines26  
Table 17.2: 
Doses of LMWH (enoxaparin) used in Pediatric Subjects 
Drug 
Age 
Initial Treatment Dose 
Initial Prophylactic Dose 
Age –dependent Dose 
of Enoxaparin 
<2 months 
1.5 mg/kg/dose q12h 
0.75 mg/kg/dose q12h 
>2 months 
1.0 mg/kg/dose q12h 
0.5 mg/kg/dose q12h 
Enoxaparin has 110 anti-factor Xa units/mg 
 
 
Table 17.3: 
Protocol for Anticoagulation Therapy to maintain an INR between 2.0 and 
3.0 for Pediatric Subjects (Warfarin treatment) 
1 
Day 1: if the baseline INR is 1.0 to 1.3: Dose  0.2 mg/kg orally 
 
2 
Loading 0.2 mg/kg Days 2-4: if the INR is: 
 
INR 
Action 
 
1.1 - 1.3 
Repeat initial loading dose 
 
1.4 - 1.9 
50% of initial loading dose 
 
2.0 - 3.0 
50% of initial loading dose 
 
3.1 - 3.5 
25% of initial loading dose 
 
>3.5 
Hold until INR ≤3.5; then restart at 50% 
decreased dose 
 
3 
Maintenance oral anticoagulation dose guidelines: 
 
INR 
Action 
 
1.1 - 1.4 
Increase by 20% of dose 
 
1.5 - 1.9 
Increase by 10% of dose 
 
2.0 - 3.0 
No change 
 
3.1 - 3.5 
Decrease by 10% of dose 
 
>3.5 
Hold until INR ≤3.5; then restart at 20% 
decreased dose 
INR = international normalized ratio 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 124 
Table 17.4: 
Doses of Fondaparinux 
Fondaparinux Doses 
Target Therapeutic Fondaparinux Level 
0.1 mg/kg, once a day 
0.5-1 mg/L (blood drawn at 3 hours post-dose) 
 
0.05 mg/kg/day (for subjects with renal 
disease).   
Dose Adjustment of Fondaparinux 
Fondaparinux Level (mg/L) 
Doses Adjustment 
<0.3 
Increase dose by 0.03 mg/kg 
0.3 - 0.5 
Increase dose by 0.01 mg/kg 
0.5 - 1 
No change 
1 - 1.2 
Decrease dose by 0.01 mg/kg 
>1.2 
Decrease dose by 0.03 mg/kg 
17.3. 
Effective Methods of Birth Control 
Women of childbearing age are defined as those women capable of conceiving, being pregnant 
with, and giving birth to children, and are eligible for the study based on the inclusion and 
exclusion criteria. 
Female subjects of childbearing potential must test negative for pregnancy at Screening with a 
highly sensitive test and must consent to avoid becoming pregnant by using an approved 
contraception method throughout the study.  
The following use of reliable method(s) of contraception, and/or abstinence, for the duration of 
therapeutic product exposure is recommended:  
Highly effective methods of contraception, when used consistently and correctly, result in 
low failure rates.  These may include:  
 Combined (estrogen and progesterone-containing) hormonal contraception associated 
with inhibition of ovulation 
 Oral 
 Intravaginal 
 Transdermal 
 Progresterone-only hormonal contraception associated with inhibition of ovulation 
 Oral 
 Injectable  
 Implantable 
 Intrauterine Device (IUD) 
 Intrauterine Hormonal-Releasing System 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 125 
 Bilateral Tubal Occlusion 
 Vasectomized partner 
 Sexual Abstinence 
Effective methods may include:  
 Barrier methods of contraception (eg, male condom, female condom, cervical cap, 
diaphragm, contraceptive sponge).   
Note: When used consistently and correctly, “double barrier” methods of 
contraception (eg, male condom with diaphragm, male condom with cervical cap) 
can be used as an effective alternative to the highly effective contraception 
methods described above.  
Oral contraception is not contraindicated with edoxaban but maybe not recommended in patients 
with high risk of thromboembolic events.  The use of oral contraception is per investigator’s 
discretion. 
17.4. 
Prohibited Concomitant Medications 
The list here (in the protocol) is static and reflects the list at the time of the current version of the 
protocol.  If there are changes to this list during the study, the changes will not be considered a 
protocol amendment and the list in this appendix will not be updated unless the protocol is being 
amended for other reasons as well.   
Subjects on these drugs at the time of planned randomization will be excluded from the study.  
After randomization, use of these drugs will require a study drug permanent discontinuation 
unless advised otherwise in the sections below.  The Investigator is encouraged to contact the 
Medical Monitor for further guidance. 
Sites will receive a contact card where the following numbers (24-hour Urgent Medical Contact) 
are provided: 
 (primary number) 
 (alternative number) 
17.4.1. 
Antiplatelet Drugs 
Use of any antiplatelet medication as single or dual agent antiplatelet therapy is prohibited while 
on study drug except for low dose aspirin defined as 1-5 mg/kg/day with maximum of 100 
mg/day.  If there is a clinical indication for single or dual agent antiplatelet therapy, the subject 
will need to be discontinued from the study treatment. 
Examples of non-aspirin oral antiplatelet agents include the following: 
 Thienopyridienes: clopidogrel (Plavix®), ticlopidine (Ticlid®), prasugrel (Effient®) 
 Dipyridamole: Persantine®, Aggrenox® 
 Cilostazol (Pletal®) 
 Pentoxifylline (Trental®) 
PPD
PPD

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 126 
 Sulfinpyrazone (Anturane®) 
 Ticagrelor (Brillanta®) 
IV antiplatelet agents include the following: 
 Glycoprotein IIb/IIIa inhibitors: Abciximab (ReoPro™), Eptifibatide (Integrilin®), 
 Tirofiban (Aggrastat®) 
 PGY12 Inhibitor: Cangrelor 
 Dextran 
17.4.2. 
Oral Anticoagulants Other than Study Drug 
Oral anticoagulants including Factor IIa inhibitors (eg, dabigatran), and FXa inhibitors (eg, 
rivaroxaban, apixaban) are prohibited in both treatment arms. The only allowed oral 
anticoagulants are the study drugs. 
17.4.3. 
Parenteral Anticoagulants 
Parenteral anticoagulants are prohibited in the edoxaban treatment arm.  Direct thrombin 
inhibitors are prohibited in edoxaban arm and in the SOC arm.  
Examples of prohibited parenteral anticoagulant medications include the following: 
 Low molecular weight heparins: enoxaparin (Lovenox®, Clexane®), dalteparin 
(Fragmin®), tinzaparin (Innohep®, Logiparin®), reviparin (Clivarin®), nadroparin 
(Fraxiparine®), ardeparin (Normiflo®), certoparin (Sandoparin®), parnaparin 
(Fluxum®) 
 Direct thrombin inhibitors: bivalirudin (Angiomax®), argatroban, (Acova®), 
desirudin (Ipravask®), lepirudin (Refludan®) 
 FXa inhibitors: fondaparinux (Arixtra®)  
17.4.4. 
Intravenous Fibrinolytics 
Examples of fibrinolytics include the following: 
 Tissue plasminogen activator (tPA, alteplase, Activase®), 
 TNK (tenecteplase, TNKase®), 
 rPA (reteplase, Retavase®), 
 Streptokinase (Streptase®), 
 Anistreplase (Eminase®). 
If a subject requires treatment with a fibrinolytic agent, then study drug must be discontinued. 
17.4.5. 
NSAIDs (excluding aspirin) 
While on study drug, NSAIDs cannot be taken for ≥4 days per week. Less frequent use of 
NSAIDs is permitted while on study drug. However, the Investigator should weigh the 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 127 
benefit/risk of NSAID use in combination with an oral anticoagulant for the individual subject. 
Examples of NSAIDs include the following: 
Aceclofenac  
Amtolmetin  
Bromfenac 
Clonixin 
Diclofenac 
Dipyrone 
Etofenamate 
Fenoprofen 
Flufenamic Acid 
Ibuprofen 
Isoxicam 
Lansoprazole/Naproxen 
Meclofenamate 
Morniflumate 
Niflumic Acid 
Oxycodone/Ibuprofen 
Pirazolac 
Prophenazone 
Suprofen 
Tiaprofenac acid 
Acemetacin  
Axapropazone  
Bufexamac  
Dexibuprofen  
Diclofenac/Hyaluronic Acid  
Droxicam  
Felbinac  
Fentiazac  
Flurbiprofen or fluribuprofen 
Indomethacin  
Ketoprofen  
Lornoxicam  
Mefanamic Acid  
Nabumetone  
Nimesulide  
Phenylbutazone  
Piroxicam  
Proquazone  
Tenidap  
Tolmetin  
Alclofinac 
Benoxaprofen 
Carprofen  
Dexketoprofen 
Diflunisal 
Etodolac 
Felbufen 
Floctafenine 
Hydrocodone/Ibuprofen 
Indoprofen  
Ketorolac  
Loxoprofen  
Meloxicam  
Naproxen  
Oxaprozin  
Piketoprofen  
Piroprofen  
Sulindac  
Tenoxicam  
Zomepirac 
17.4.6. 
P-gp Inhibitors List (Not Prohibited Medication but Requires Dose Adjustment) 
Use of P-gp inhibitors during the treatment with edoxaban will require dose reduction either at 
randomization or during the course of the study. The only exemption from this rule is the use of 
amiodarone which will not require dose reduction. 
Below are examples (but not limited to) the most commonly used P-gp inhibitors: 
Table 17.5: 
P-gp Inhibitors List 
Drug Class 
Drug Name 
Antiarrhythmics 
Amiodarone, quinidine, verapamil, dronedarone, 
carvedilol, ranolazine 
Antibiotics 
Clarithromycin 
Anti-fungal 
Itraconazole 
Others 
Lapatinib, lopinavir, ritonavir, propafenone, 
saquinavir, telaprevir, and tipranavir 
17.4.7. 
P-gp Inducers List (Prohibited Medication) 
Rifampin is a P-gp inducer that has been shown to lower the edoxaban exposure.  The example 
medications listed below (but not limited to) have not been tested with edoxaban but are also P-

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 128 
gp inducers.  These should be avoided during the study as their use may lead to a lower exposure 
of edoxaban than predicted for clinical efficacy.  (http://www.straighthealthcare.com/p-
glycoprotein.html#inducers)  
 Rifampin 
 Carbamazepine (Tegretol®)  
17.5. 
Transition from Edoxaban to Other Anticoagulants 
Subjects who require anticoagulation at the end of study participation will be transitioned to 
standard-of-care treatment as directed by the Investigator or treating physician. 
At the end of edoxaban treatment, the subject will receive the last dose of edoxaban and all 
remaining edoxaban tablets/bottles will be collected from the subject by site staff.  
When transitioning from edoxaban to VKA: 
Subjects transitioning to any VKA from edoxaban will have their INR recorded at last study 
visit. Bridging with heparin may occur during VKA titration until the INR is at therapeutic level 
of between 2.0 and 3.0. 
INR will need to be measured as frequently as necessary until the INR target of ≥2.0. Once the 
INR is ≥2.0 the heparin will be stopped and the subject will continue on the VKA alone. 
When transitioning from edoxaban to another direct oral anticoagulant (eg rivaroxaban, 
apixaban, dabigatran): 
 The first dose of the direct oral anticoagulant of choice will be given 24 hours post 
the last dose of edoxaban and will then be continued as per the novel anticoagulant’s 
label. 
For subjects who do not complete the Main Treatment Period, they will be followed with 
monthly visits until the end of Month 3 plus a Follow-Up Visit according to the Schedule of 
Events (Table 17.1).  
For subjects who completed the Main Treatment Period but do not continue into the Extension 
Treatment Period, a Follow-Up Visit (9) will occur 30 days after the Month 3 visit. 
For subjects who continue into the Extension Period, the Follow-Up Visit will occur 30 days 
after the Discontinuation Visit.   
17.6. 
Management of Serious/Life-Threatening Bleeding 
The following steps are currently recommended26 for subjects with ongoing major bleeding (see 
Section 9.2.1): 
 Withhold study drug and all antiplatelets / anticoagulants  
 Institute SOC for major bleeding (large bore IV or central venous line, type and 
crossmatch blood, admit to the intensive care unit, provide hemodynamic and 
respiratory support) 
 Administer packed red blood cells (or whole blood) as needed 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 129 
 Administer antidotes if applicable 
For LMWH:   
The antidote for LMWH is protamine sulphate.  
The dose of protamine sulphate given is dependent upon the dose of LMWH administered and 
the time of administration.  
Suggestions from the Sponsor: 
If protamine is given within 8 hours of the LMWH then a maximum neutralizing dose is 1 mg 
protamine/100 units (or 1 mg) of LMWH given in the last dose. 
If more than 8 hours have passed since the dose of LMWH was given, administer 0.5 mg 
protamine per 1 mg (100 units) of LMWH given.  
Protamine is administered by slow IV infusion (over 10 minutes) to avoid a hypotensive 
reaction.   
Protamine is a medication that requires a high level of caution when being prescribed and 
administered.  Outside cardiac surgery and ICU, consultant or fellow approval is required for the 
use of protamine- do not allow this to lead to delayed administration in the case of bleeding.  
Contact the appropriate senior person immediately. 
For Warfarin: 
Significant but not life-threatening bleeding: Administer Vitamin K 0.5 mg to 2 mg SC (NOT 
intramuscularly) plus FFP (20 mL/kg IV) to a maximum of 4 units.   
Major bleeding (any INR) or requiring emergency surgery doses if INR >8  
 Stop warfarin 
 Vitamin K (30 µg/kg) IV, consider higher doses if INR >8 
 Prothrombin complex concentrate (PCC) replacement therapy (NB FFP gives inferior 
correction and is not recommended): 
 Beriplex® [4-factor Prothrombin Complex Concentrate approved in several EU 
countries] (and Kcentra® approved in the US) (Discuss with on call 
haematologist)  
 Beriplex dosage is calculated based on the current INR and subject’s weight (see 
table below) 
 Repeat the INR following PCC 
 Further doses of Beriplex or Vitamin K may be required 
INR 
Approximate Dose 
2.0-3.9 
1 mL/kg = 25 IU/kg 
4.0-6.0 
1.4 mL/kg = 35 IU/kg 
>6.0 
2 mL/kg = 50 IU/kg 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 130 
For Edoxaban:  
Although not evaluated in clinical trials, PCC, activated prothrombin complex concentrates 
(aPCCs), or recombinant Factor VIIa could be considered for the reversal of the anticoagulant 
effect of edoxaban.  In healthy volunteers, a 3-factor PCC restored thrombin generation (AUC 
for thrombin generation curve) but did not normalize PT.  Thus, a 3-factor PCC may be of some 
value in reversing anticoagulant effects of edoxaban (Study A-U150). 
A specific reversal agent for edoxaban is not available.  Although not evaluated in subjects, PCC 
(Beriplex® or Kcentra®), aPCCs, or recombinant Factor VIIa could be considered for the 
reversal of the anticoagulant effect of edoxaban.  
The following are not expected to reverse the anticoagulant effects of edoxaban: 
 protamine sulfate,  
 vitamin K,   
 tranexamic acid.  
Hemodialysis does not significantly contribute to edoxaban clearance.  
In the event of a Medical Emergency, the Investigator at the study site will institute any medical 
procedures deemed appropriate.  A 24-hour Urgent Medical Contact will be provided to contact 
the Medical Monitor for further guidance. 
Sites will receive a contact card where the following numbers (24-hour Urgent Medical Contact) 
are provided: 
 (primary number) 
 (alternative number) 
The medical call center will contact Medical Monitor for the assigned region. 
PPD
PPD

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 131 
17.7. 
Estimated Glomerular Filtration Rate (eGFR) Assessment 
Age (Sex) 
Normal eGFR 
 
 
(Mean eGFR±SD) 
(mL/min/1.73 m2) 
30% eGFR for Study 
Qualificationa 
 
(Mean eGFR) 
(mL/min/1.73 m2) 
eGFR Threshold for 
Dose reductionb 
 
(Mean eGFR) 
(mL/min/1.73 m2) 
1 week 
(males and females) 
41 ± 15 
10 
15 
2-8 weeks 
(males and females) 
66 ± 25 
10 
20 
>8 weeks 
(males and females) 
96 ± 22 
20 
35 
2-12 years 
(males and females) 
133 ± 27 
30 
50 
13-21 years 
(males) 
140 ± 30 
35 
55 
13-21 years 
(females) 
126 ± 22 
30 
50 
eGFR: estimated glomerular filtration rate; m: meters; min: minutes; mL: milliliter; SD: standard deviation 
Ref: American Journal of Kidney Diseases, Vol 39, No 2, Suppl 1 (February), 2002: pp S46-S75 
a  may be enrolled if eGFR is at or greater to this value as determined by the age appropriate formula indicated 
below: 
b eGFR must be less than this value for dose reduction (which corresponds to approximately ≤50% eGFR). 
Modified Schwartz equation (pediatric subjects <12 years of age):  
CrCl (mL/min/1.73 m2) = (K * Ht) / Scr   
height (Ht) in cm; serum creatinine (Scr) in mg/dL  
K (proportionality constant): 656  
Infant (LBW <1 year): K=0.33   
Infant (Term <1 year): K=0.45  
Female Child (<12 years): K=0.55 
Male Child (<12 years): K=0.70  
Cockcroft-Gault equation (pediatric subjects ≥12 years of age):   
CrCL (mL/min) = [(140 - age) × weight in kg] / [Scr × 72] (× 0.85 if female) 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 132 
17.8. 
Blood Pressure Levels for Boys and Girls by Age and Height  
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 133 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 134 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 135 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 136 
17.9. 
Growth Chart (2 to 20 years and Birth to 24 Months) 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 137 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 138 
 

Protocol DU176b-D-U312 
Version 4.0, 08 JUN 2021 
 
Proprietary and Confidential 
Page 139 
 
 
17.10. 
Instructions for Specimen Collection, Storage and Shipment 
A laboratory guidance manual will be provided by the central laboratory for specimen collection.