A Single-Centre, Randomised, Double-Blind, Placebo-Controlled, 3-Period, Cross-Over Phase I Study to Investigate the Effect on the QTcF Interval of a Single Dose of 2 Different Doses of Verinurad, Each in Combination With Allopurinol 300 mg, Compared With Placebo In Healthy Volunteers
Phase: PHASE1
Conditions: Healthy Volunteers (Intended Indication: Chronic Kidney Disease)
Sponsor: AstraZeneca

 
 
 
 
 
 
 
 
A Single-Centre, Randomised, Double-Blind, Placebo-Controlled, 3-Period, 
Cross-Over Phase I Study to Investigate the Effect on the QTcF Interval of a 
Single Dose of 2 Different Doses of Verinurad, Each in Combination with 
Allopurinol 300 mg, Compared with Placebo In Healthy Volunteers 
 
 
ClinicalTrials.gov Identifier: NCT04256629  
 
 
Protocol Amendment No. 2: Final 1.0, 11 May 2020 

Clinical Study Protocol
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Verinurad and Allopurinol - D5495C00012
11 May 2020
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Clinical Study Protocol
A Single-Centre, Randomised, Double-Blind, 
Placebo-Controlled, 3-Period, Cross-Over Phase I Study to 
Investigate the Effect on the QTcF Interval of a Single Dose of 
2 Different Doses of Verinurad, Each in Combination with 
Allopurinol 300 mg, Compared with Placebo In Healthy 
Volunteers
Parexel Study No.:
PXL244261
Sponsor Study Code:
D5495C00012
EudraCT No:
2019-003657-28
Study Type:
Randomised, double-blind, placebo-controlled, cross-over study
Test Products:
Verinurad extended-release capsule, 24 mg
Verinurad immediate-release capsule, 40 mg
Allopurinol, 300 mg
Reference Product:
Placebo
Therapeutic Indication:
Chronic kidney disease
Pharmacological Class:
URAT1 inhibitor
Development Phase:
Phase I
Sponsor:
AstraZeneca AB
151 85 Södertälje
Sweden
Study Centre:
Parexel Early Phase Clinical Unit (Berlin)
14050 Berlin
Germany
Date of Protocol:
Final 1.0, 07 November 2019
Protocol Amendment No. 1:
Final 1.0, 27 January 2020
Protocol Amendment No. 2:
Final 1.0, 11 May 2020
This clinical study will be conducted according to the protocol and in compliance with the 
International Council for Harmonisation Tripartite guideline for Good Clinical Practice and with 
other applicable regulatory requirements.
Confidentiality Statement
This confidential document is the property of AstraZeneca.  No unpublished information contained 
herein may be disclosed without prior written approval from AstraZeneca.  Access to this 
document must be restricted to relevant parties.
PPD

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PROTOCOL AMENDMENTS
Protocol Amendment No. 2, dated 11 May 2020
The protocol was amended in order to adhere to the newly issued EMA Guidance on the 
Management of Clinical Trials during the COVID-19 (Coronavirus) pandemic. The 
following sections of the protocol were changed to adapt the risk assessment in response to 
the current pandemic situation and describe risk mitigation measures:

Section 5.1.1 Background to COVID-19 (section inserted)

Section 5.3.2 Overall Study Design (text inserted)

Section 5.3.3 Study Flow Chart and Schedule of Assessments, Table 5-2 (text and 
footnotes added)

Section 5.3.4 Total Blood Volume, Table 5-4 (blood volume updated)

Section 5.5.1 Risk Assessment for COVID-19 Pandemic (section inserted)

Section 6.2 Secondary Objectives, Table 6-2 (text added)

Section 7.1.2 Exclusion Criteria (criteria added)

Section 7.2 Restrictions During the Study (restrictions added)

Section 7.3 Replacement of Subjects (text added)

Section 8.1 Discontinuation of Investigational Medicinal Product and Withdrawal 
from the Study (text added)

Section 8.1.1 Premature Termination of the Study and Stopping Criteria (text added)

Section 10.4 Safety Measurements (text added)

Section 10.4.2.6 Viral Serology (text added)

Section 10.4.2.7 SARS-CoV-2 Virology (section added)

Section 10.4.3 Vital Signs (text added)

Section 11.3 Study Monitoring (text added)

Section 12.12.3 Laboratory Assessments (text added)

Section 12.5 Protocol Deviations (text added)

Section 13.2.8 COVID-19 (section added)

Section 15 List of References (references added)
Further changes implemented:

Name of Sponsor’s Biostatistician changed

Update of estimated date of ‘first subject enrolled ‘ and ‘last subject completed’.

Minor editorial changes.
Protocol Amendment No. 1, dated 27 January 2020

Update of estimated date of ‘last subject completed’ to May 2020.
Corresponding change made in protocol synopsis.

Reduction of maximum Screening Period from 38 days to 28 days.

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Corresponding changes made in protocol synopsis, Section 5.3.2, Table 5-1, Figure 5-1, 
and Table 5-2. 

Reduction of expected approximate study duration from 60 days to 53 days.
Corresponding changes made in protocol synopsis, Section 5.3.2.2, and Table 5-1.

Update of stopping rules to include details for electrocardiogram.
Corresponding change made in Section 8.1.

Clarification concerning the reporting of clinically significant adverse events.
Corresponding change made in Section 13.2.6.

Minor editorial changes.

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PROTOCOL SYNOPSIS
Title of the Study
A single-centre, randomised, double-blind, placebo-controlled, 3-period, cross-over 
Phase I study to investigate the effect on the QTcF interval of a single dose of 2 different 
doses of verinurad, each in combination with allopurinol 300 mg, compared with placebo 
in healthy volunteers
Principal Investigator
Thomas Kӧrnicke, MD
Study Centre
This study will be conducted at a single study centre.
Study Rationale
This study will be conducted to investigate the safety of verinurad, in particular its effect 
on electrocardiogram (ECG), with particular focus on the QT/QTc interval.  A 
prolongation of the QT/QTc interval can be associated with increased susceptibility to 
cardiac arrhythmias.  Therefore, adequate investigation of the safety of new 
non-antiarrhythmic drugs that have systemic bioavailability should include rigorous 
characterisation of their effects on ECG, with particular focus on the QT/QTc interval, 
according to the International Conference on Harmonisation (ICH) Guideline E14 and ICH 
E14 Question and Answers (Q&A) document. 
Number of Subjects Planned
A total of 24 subjects are planned to be randomised to achieve at least 20 evaluable 
subjects at the end of the last treatment period.
Study Period
Estimated date of first subject enrolled:
Jun 2020 (signing of informed consent)
Estimated date of last subject completed:
Sep 2020
Study Objectives
Primary Objective:

To assess the effect of a single dose of verinurad given as either a 24 mg 
extended-release (ER8) formulation (therapeutic exposure) or a 40 mg 
immediate-release (IR) formulation (supra-therapeutic exposure), both in combination 
with allopurinol 300 mg, on the QT interval corrected for heart rate using Fridericia’s 
formula (QTcF) compared to placebo using a concentration-QTcF interval analysis.
Secondary Objectives:

To investigate the effect of verinurad given either as a 24 mg ER8 formulation 
(therapeutic exposure) or a 40 mg IR formulation (supra-therapeutic exposure), both 
in combination with allopurinol 300 mg, on HR and additional digital ECG (dECG) 
variables (PR, QRS, QT and RR).

To assess the pharmacokinetics (PK) of verinurad and its metabolites (M1 and M8) 
and allopurinol and its metabolite (oxypurinol) in healthy subjects.

To assess the relationship between plasma concentrations of verinurad, allopurinol and 
the metabolites M1, M8, oxypurinol and dECG variables and HR.

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
To examine the safety and tolerability of verinurad and allopurinol.
Study Design
This study will be conducted as a single-centre, randomised, placebo-controlled, double-
blind, 3-period, cross-over study to assess the effect on the QTcF interval of a single oral 
dose of verinurad 24 mg ER8 formulation (therapeutic exposure) or verinurad 40 mg IR 
formulation (supra-therapeutic exposure), each in combination with allopurinol 300 mg, 
compared to placebo in healthy subjects. 
There are 3 study treatments:

Treatment A: Verinurad 24 mg ER8 formulation co-administered with 300 mg 
allopurinol 

Treatment B: Verinurad 40 mg IR formulation co-administered with 300 mg 
allopurinol

Treatment C: Matched placebos for both verinurad and allopurinol
All subjects will receive a single dose of all 3 treatments (A, B, and C) in a cross-over 
design with wash-out periods of at least 7 days between each study dose administration.  
Subjects will be randomised to the treatment sequence (ABC, BCA, CAB, etc.) using 
William’s Latin square.  The treatments will be administered in a double-blind manner 
after an overnight fast of at least 10 hours.
The study will comprise the following periods (visits):

Screening Period of maximum 28 days (Visit 1);

Three treatment periods of 3 days each, during which subjects will be resident at the 
study centre from the morning of the day before administration of the study dose until 
discharge 2 days after study dose administration (Visits 2 to 4);

Wash-out periods of at least 7 days between each study dose administration;

Final visit within 7 to 10 days after the last study dose administration (Visit 5).
Expected Duration of the Study
Each subject will be involved in the study for approximately 53 days and have 5 study 
visits.
Targeted Study Population
This study will be conducted in healthy male and female subjects aged 18 to 50 years 
(inclusive).
Test and Reference Products
The test products are verinurad 12 mg ER8 capsules, verinurad 10 mg IR capsules and 
allopurinol 300 mg tablets. The reference product is placebo matching verinurad and 
allopurinol.
Outcome Measures

The primary outcome measure is ΔΔQTcF (derived from concentration-QTcF 
modeling).  Parameters for this outcome measure are QTcF and Cmax.

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The secondary outcome measures are: 

Baseline-corrected and placebo-adjusted dECG parameters (ΔHR, ΔΔHR, ΔRR 
interval, ΔΔRR interval, ΔPR interval, ΔΔPR interval, ΔQRS interval, ΔΔQRS 
interval, ΔQT interval, ΔΔQT interval, ΔQTcF interval, ΔΔQTcF interval).
Parameters for this outcome measure are the dECG variables HR, RR, PR, QRS, QT 
and QTcF.

As appropriate and where possible, the following PK parameters will be assessed for 
verinurad, M1, M8, allopurinol, and oxypurinol: AUC, AUC0-t, Cmax, tmax, tlag, 
t½λz, tlast, CL/F, Vz/F, Vss/F and MRT.  Plasma concentration-time profile for each 
analyte.

Plasma concentrations of verinurad, M1, M8, allopurinol, and oxypurinol and
time-matched, baseline-corrected and placebo-adjusted dECG parameters (ΔHR, 
ΔΔHR, ΔRR interval, ΔΔRR interval, ΔPR interval, ΔΔPR interval, ΔQRS interval, 
ΔΔQRS interval, ΔQT interval, ΔΔQT interval, ΔQTcF interval, ΔΔQTcF interval).  
Parameters for this outcome measure are the plasma concentration of each analyte at 
each time point and the time-matched dECG variables HR, RR, PR, QRS, QT and 
QTcF.

Assessment of AEs, laboratory variables (haematology, clinical chemistry and 
urinalysis), vital sign variables (systolic and diastolic blood pressure, pulse rate, body 
temperature), ECG parameters, telemetry findings and physical examination findings.
Statistical Methods
Study Populations:

The Safety Analysis Set will include all subjects who received at least 1 dose of 
investigational medicinal product (IMP) (verinurad, allopurinol or placebo) and for 
whom any safety post-dose data are available.  Unless otherwise stated, the Safety 
Analysis Set will be used for the presentation of all demographic and disposition data, 
as well as all safety analyses.  

The pharmacodynamic (PD) Analysis Set will consist of all subjects in the Safety 
Analysis Set for whom baseline and post-baseline QTcF results from smoothed dECG 
data are available for at least 2 treatment periods (where 1 of the treatment periods 
needs to be the period in which the subject received placebo), and who have no major 
protocol deviations thought to impact on the analysis of the dECG data.

The PK Analysis Set will consist of all subjects in the Safety Analysis Set for whom at 
least 1 reportable PK parameters can be calculated and who have no major protocol 
deviations thought to impact on the analysis of the PK data.

The Randomised Set will consist of all subjects randomised into the study.
Presentation and Analysis of Pharmacodynamic Data:
A linear mixed-effect concentration-QTcF model will be used as the primary analysis.  
Baseline-corrected and placebo-adjusted QTcF (ΔΔQTcF), using individual time-matched 
placebo for a given subject, will be the dependent variable and verinurad plasma 
concentrations will be the independent variable.  Fixed effects will be: intercept in the 
absence of a treatment effect, slope of the assumed linear association between 
concentration and ΔΔQTcF and baseline QTcF.  Random effects will be included on the 
intercept term and the slope. ΔΔQTcF at the concentration of interest will be estimated.  
A prolonging effect will be excluded if the upper bound of the two-sided 90% confidence 

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interval for model-derived ΔΔQTcF is estimated to be <10 ms at the highest clinically 
relevant exposure. Details of the concentration-QTcF modeling and the definition of the 
analysis population of the primary analysis will be provided in a separate document (C-QT 
analysis plan).  
After the smoothing of QT and RR into target time point values, the heart rate
(HR)-corrected QT will be calculated (QTcF) using the standard formula.  All the 
statistical analyses will be performed using smoothed data.  Digital ECG variables 
(absolute values and change from baseline for: HR, RR, PR, QRS, QT and QTcF) will be 
listed by subject and time point and summarised by treatment group using appropriate 
descriptive statistics; in addition, exploratory plots will be provided (such as time course 
for each dECG variable, changes from baseline for each dECG variable, by treatment 
group, mean with SD) and time course for ΔΔ: RR, HR, PR, QRS, QTcF for each 
treatment group. 
Presentation and Analysis of Pharmacokinetic Data:
A listing of PK blood sample collection times, as well as derived sampling time deviations 
will be provided.  Plasma concentrations will be summarised for the PK Analysis Set for 
each time point by analyte and treatment.  All reportable plasma PK parameters will be 
listed for each subject, analyte, and treatment.  A separate listing will be provided for the 
diagnostic PK parameters.  All eligible PK data will be presented for the PK Analysis Set 
for each analyte (verinurad, M1, M8, allopurinol, and oxypurinol) using descriptive 
statistics.  No inferential statistical analysis of PK parameters will be conducted.
Presentation and Analysis of Safety and Eligibility Data:
Safety data will be presented in the data listings.  Continuous variables will be summarised 
using descriptive statistics by treatment.  Changes (and/or percentage change) from 
baseline will be presented where applicable when baseline is defined.  Categorical 
variables will be summarised in frequency tables (frequency and proportion) by treatment.  
Tabulations and listings of data for vital signs and clinical laboratory tests will be 
presented; 12-lead safety ECG data will be listed only.
Adverse events (AEs) will be summarised by treatment and overall for all subjects, 
including tabulations by causality and severity (mild, moderate and severe).  All 
tabulations will be presented by System Organ Class (SOC) and Preferred Term.  An 
overview of all AEs will be presented, separately for the number and percentage of 
subjects and the number of events.  This will include categories for any AE, SAEs, AEs 
leading to discontinuation of IMP (DAE) and AEs with outcome of death.  Listings of all 
AEs, SAEs, DAEs and AEs that led to death will be presented.  
Haematology and clinical chemistry values will be listed by subject and time point 
including changes from baseline and repeat/unscheduled measurements.  Summary 
tabulations including absolute value and changes from baseline will be presented by 
treatment and time point for the Safety Analysis Set.
Vital signs measurements will be listed by subject and time point including the date/time 
of the assessment, changes from baseline and repeat/unscheduled measurements.  
Determination of Sample Size
Study sample size for a concentration-QTcF (C-QTcF)-based interval analysis is based on 
the recommendation from Garnett et al 2018* to have 16 to 32 subjects on drug and 8 to 
16 subjects on placebo.  The type-1 error rate has been shown to be controlled at around 
5% when the true effect is 10 ms in small-sized studies of 6 to 12 subjects with multiple 
measurements per subject.

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A 3-period cross-over study, using C-QTcF-based interval analysis, with 2 verinurad doses 
and placebo in 20 evaluable healthy volunteers is expected to exceed the recommendations 
proposed by Garnett et al 2018*.
Twenty-four subjects will be randomised to a 6-sequence William’s design for 3 periods 
and 3 treatments to achieve 20 evaluable subjects based on an expected dropout of 17%. 
*Garnett C, Bonate PL, Dang Q, Ferber G, Huang D, Liu J, et al. Scientific white paper on 
concentration-QTc modeling. J Pharmacokinet Pharmacodyn. 2018;45(3):383-97.

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1.
TABLE OF CONTENTS
PROTOCOL AMENDMENTS....................................................................................2
Protocol Amendment No. 1, dated 27 January 2020 .....................................................2
PROTOCOL SYNOPSIS.............................................................................................4
1.
TABLE OF CONTENTS...........................................................................9
1.1.
List of Tables...........................................................................................13
1.2.
List of Figures..........................................................................................13
1.3.
List of Appendices...................................................................................13
2.
LIST OF ABBREVIATIONS AND DEFINITION OF TERMS ..............14
3.
ETHICAL AND REGULATORY REQUIREMENTS.............................19
3.1.
Ethical Conduct of the Study....................................................................19
3.2.
Subject Data Protection............................................................................19
3.3.
Ethics and Regulatory Review .................................................................19
3.4.
Insurance .................................................................................................20
3.5.
Informed Consent ....................................................................................20
3.6.
Changes to the Protocol and Informed Consent Form...............................20
4.
INVESTIGATORS AND STUDY ADMINISTRATIVE STRUCTURE .21
5.
INTRODUCTION...................................................................................24
5.1.
Background Information..........................................................................24
5.1.1.
Background to COVID-19.......................................................................25
5.2.
Drug Information.....................................................................................26
5.2.1.
Verinurad.................................................................................................26
5.2.1.1.
Description of Verinurad .........................................................................26
5.2.1.2.
Pre-clinical Data Related to Cardiovascular Safety...................................26
5.2.1.3.
Clinical Pharmacokinetics........................................................................26
5.2.1.4.
Safety Profile Derived from Clinical Studies............................................27
5.2.2.
Allopurinol ..............................................................................................28
5.3.
Study Rationale and Justification of Study Design ...................................28
5.3.1.
Study Rationale .......................................................................................28
5.3.2.
Overall Study Design...............................................................................29
5.3.2.1.
End of Study............................................................................................30
5.3.2.2.
Expected Duration of the Study ...............................................................30
5.3.3.
Study Flow Chart and Schedule of Assessments ......................................31
5.3.4.
Total Blood Volume ................................................................................37
5.3.5.
Order of Assessments ..............................................................................37
5.4.
Dose Rationale.........................................................................................37
5.5.
Risk-benefit Assessment..........................................................................38
5.5.1.
Risk Assessment for COVID-19 Pandemic ..............................................39
6.
STUDY OBJECTIVES............................................................................41
6.1.
Primary Objective....................................................................................41
6.2.
Secondary Objectives...............................................................................41

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6.3.
Exploratory Objective(s): Not Applicable ................................................41
7.
STUDY POPULATION ..........................................................................42
7.1.
Selection of Study Population ..................................................................42
7.1.1.
Inclusion Criteria .....................................................................................42
7.1.2.
Exclusion Criteria ....................................................................................43
7.2.
Restrictions During the Study ..................................................................45
7.2.1.
Reproductive Restrictions ........................................................................46
7.2.1.1.
Women of Non-Childbearing Potential ....................................................47
7.2.1.2.
Women of Childbearing Potential ............................................................47
7.2.1.3.
Male Subjects ..........................................................................................48
7.3.
Replacement of Subjects..........................................................................49
8.
STUDY STOPPING RULES...................................................................50
8.1.
Discontinuation of Investigational Medicinal Product and Withdrawal from 
the Study..................................................................................................50
8.1.1.
Premature Termination of the Study and Stopping Criteria.......................50
9.
TREATMENTS.......................................................................................52
9.1.
Identity of the Investigational Medicinal Product.....................................52
9.2.
Supply of Investigational Medicinal Product............................................52
9.3.
Storage and Handling Procedures.............................................................53
9.4.
Labeling ..................................................................................................53
9.5.
Drug Accountability, Dispensing and Destruction....................................53
9.6.
Dose and Treatment Regimens.................................................................53
9.7.
Concomitant and Post-study Treatment(s)................................................54
9.8.
Treatment Compliance.............................................................................54
9.9.
Randomisation.........................................................................................55
9.9.1.
Subject Enrolment and Randomisation.....................................................55
9.9.2.
Procedures for Randomisation .................................................................55
9.9.3.
Procedures for Handling Incorrectly Randomised Subjects ......................56
9.10.
Blinding...................................................................................................56
9.11.
Methods for Ensuring Blinding................................................................56
9.12.
Methods for Unblinding the Study...........................................................57
10.
MEASUREMENTS AND METHODS OF ASSESSMENTS ..................58
10.1.
Appropriateness of Measurements ...........................................................58
10.2.
Enrolment and Screening Procedures.......................................................58
10.3.
Pharmacokinetics.....................................................................................58
10.3.1.
Collection of Pharmacokinetic Samples ...................................................58
10.3.2.
Pharmacokinetic Drug Assays..................................................................58
10.4.
Safety Measurements...............................................................................58
10.4.1.
Adverse Events........................................................................................59
10.4.2.
Laboratory Assessments ..........................................................................59
10.4.2.1.
Haematology ...........................................................................................59
10.4.2.2.
Serum Clinical Chemistry........................................................................59
10.4.2.3.
Genotyping..............................................................................................59
10.4.2.4.
Urinalysis ................................................................................................60

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10.4.2.5.
Pregnancy Testing ...................................................................................60
10.4.2.6.
Viral Serology .........................................................................................60
10.4.2.7.
SARS-CoV-2 Virology............................................................................60
10.4.2.8.
Drugs of Abuse and Alcohol....................................................................60
10.4.3.
Vital Signs...............................................................................................61
10.4.4.
Electrocardiography.................................................................................61
10.4.4.1.
12-lead Safety Electrocardiogram ............................................................61
10.4.4.2.
Electronic Capture of 12-lead Continuous Digital Electrocardiogram.......62
10.4.5.
Telemetry ................................................................................................63
10.4.6.
Physical Examination...............................................................................63
10.5.
Exploratory Assessments – Not Applicable..............................................63
10.6.
Procedures for Handling of Biological Samples .......................................64
10.6.1.
Storage and Destruction of Biological Samples........................................64
10.6.1.1.
Pharmacokinetic Samples ........................................................................64
10.6.1.2.
Pharmacodynamic Samples – Not Applicable ..........................................64
10.6.1.3.
Pharmacogenetic Samples – Not Applicable ............................................64
10.6.2.
Labeling and Shipment of Biohazard Samples .........................................64
10.6.3.
Chain of Custody of Biological Samples..................................................64
10.6.4.
Withdrawal of Informed Consent for Donated Biological Samples...........65
11.
DATA QUALITY ASSURANCE AND DATA MANAGEMENT..........66
11.1.
Quality Control and Source Data Verification..........................................66
11.2.
Audit/Inspections.....................................................................................66
11.3.
Study Monitoring.....................................................................................66
11.4.
Data Collection........................................................................................66
11.4.1.
Case Report Forms and Source Documents..............................................67
11.4.2.
Access to Source Documents ...................................................................67
11.5.
Data Management....................................................................................67
12.
STATISTICAL METHODS ....................................................................69
12.1.
Overview.................................................................................................69
12.2.
General Statistical Methodology..............................................................69
12.2.1.
Missing Data............................................................................................70
12.3.
Study Populations ....................................................................................70
12.3.1.
Randomised Set.......................................................................................70
12.3.2.
Safety Analysis Set..................................................................................70
12.3.3.
Pharmacodynamic Analysis Set ...............................................................70
12.3.4.
Pharmacokinetic Analysis Set..................................................................70
12.4.
Determination of Sample Size..................................................................71
12.5.
Protocol Deviations..................................................................................72
12.6.
Subject Disposition..................................................................................72
12.7.
Demographic and Baseline Data ..............................................................73
12.8.
Prior and Concomitant Medication and Drug Administration...................73
12.8.1.
Prior and Concomitant Medication...........................................................73
12.8.2.
Drug Administration................................................................................73
12.9.
Pharmacodynamic Analysis .....................................................................73
12.10.
Pharmacokinetic Analysis........................................................................75
12.10.1.
Pharmacokinetic Parameters ....................................................................75

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12.10.2.
Derivation of Pharmacokinetic Parameters...............................................76
12.10.3.
Presentation of Pharmacokinetic Data......................................................77
12.10.4.
Statistical Analysis of Pharmacokinetic Data ...........................................80
12.11.
Pharmacokinetic/Pharmacodynamic Analysis ..........................................80
12.12.
Analysis of Safety Data............................................................................80
12.12.1.
12-lead Safety Electrocardiogram ............................................................80
12.12.2.
Adverse Events........................................................................................80
12.12.3.
Laboratory Assessments ..........................................................................82
12.12.4.
Vital Signs...............................................................................................82
12.12.5.
Physical Examination...............................................................................82
13.
ADVERSE EVENTS...............................................................................83
13.1.
Definitions...............................................................................................83
13.1.1.
Definition of Adverse Events...................................................................83
13.1.2.
Definitions of Serious Adverse Event ......................................................83
13.1.3.
Other Significant Adverse Events ............................................................84
13.2.
Recording of Adverse Events...................................................................84
13.2.1.
Time Period for Collection of Adverse Events .........................................84
13.2.2.
Follow-up of Unresolved Adverse Events................................................84
13.2.3.
Variables .................................................................................................84
13.2.4.
Causality Collection.................................................................................85
13.2.5.
Adverse Events Based on Symptoms and Signs .......................................85
13.2.6.
Adverse Events Based on Examinations and Tests...................................86
13.2.7.
Hy's Law .................................................................................................86
13.2.8.
COVID-19...............................................................................................86
13.3.
Reporting of Serious Adverse Events.......................................................86
13.4.
Regulatory Reporting Requirements for Serious Adverse Events .............87
14.
LEGAL AND ADMINISTRATIVE ASPECTS.......................................88
14.1.
Archiving of Study Documents................................................................88
14.2.
Publication of Study Results ....................................................................88
14.3.
Clinical Study Report...............................................................................88
15.
LIST OF REFERENCES.........................................................................89
16.
APPENDICES.........................................................................................91

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1.1.
List of Tables
Table 5-1
Expected Duration of Each Study Part ............................................31
Table 5-2
Schedule of Assessments ................................................................33
Table 5-3
Study Plan - Time Schedule for Digital Electrocardiogram 
Assessments During Residential Period (Visits 2, 3 and 4)..............36
Table 5-4
Total Blood Volume .......................................................................37
Table 6-1
Primary Objective and Outcome Measures......................................41
Table 6-2
Secondary Objectives and Outcome Measures ................................41
Table 9-1
Identity of the Investigational Medicinal Products - Verinurad 12 mg 
ER8, Verinurad 10 mg IR and Matching Placebo............................52
Table 9-2
Identity of the Investigational Medicinal Products - Allopurinol and 
Matching Placebo ...........................................................................52
Table 9-3
Treatment Regimens.......................................................................54
1.2.
List of Figures
Figure 5-1
Study Flow Chart............................................................................32
1.3.
List of Appendices
Appendix A
Additional Safety Information.........................................................92
Appendix B
International Airline Transportation Association 6.2 Guidance 
Document .......................................................................................94
Appendix C
Actions Required in Cases of Increases in Liver Biochemistry and 
Evaluation of Hy’s Law..................................................................95
Appendix D
Actions Required in Cases of a Renal-related or Urolithiasis 
Treatment-emergent Adverse Event or a Serum Creatinine 
Elevation ......................................................................................100

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2.
LIST OF ABBREVIATIONS AND DEFINITION OF TERMS
Abbreviation or 
Special Term
Explanation
%AUCextr
Percentage of AUC obtained by extrapolating the area under the plasma 
concentration-time curve from the time of the last quantifiable concentration to 
infinity
AE
Adverse event (see definition in Section 13.1.1)
ALP
Alkaline phosphatase
ALT
Alanine aminotransferase
AST
Aspartate aminotransferase
AUC
Area under plasma concentration-time curve from zero to infinity
AUC(0-t)
Area under the plasma concentration-curve from time zero to time of last 
quantifiable concentration
AV
Atrioventricular
AZRand
AstraZeneca randomisation system
β-hCG
Beta human chorionic gonadotropin
BfArM
Federal Institute for Drugs and Medical Devices 
BMI
Body mass index
bpm
Beats per minute
CL/F
Apparent total body clearance of drug from plasma after extravascular 
administration (parent drug only)
ClinBase™
Parexel's electronic source data capturing and information management system
Cmax
Maximum observed plasma concentration
COVID-19
Coronavirus disease 2019
C-QTc
Concentration-QTc
C-QTcF
Concentration-QTcF
CPKA
Covance Clinical Pharmacokinetic Alliance 
CRF
Case report form
CRO
Contract research organization
CRP
C-reactive protein
CSP
Clinical study protocol
CSR
Clinical study report 
CV
Coefficient of variation
ΔHR
Baseline-corrected heart rate
ΔRR interval
Baseline-corrected RR interval
ΔPR interval
Baseline-corrected PR interval
ΔQRS interval
Baseline-corrected QRS interval
ΔQT interval
Baseline-corrected QT interval
ΔQTcF interval
Baseline-corrected QTcF interval
ΔΔHR
Baseline-corrected and placebo-adjusted heart rate

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Abbreviation or 
Special Term
Explanation
ΔΔRR interval
Baseline-corrected and placebo-adjusted RR interval
ΔΔPR interval
Baseline-corrected and placebo-adjusted PR interval
ΔΔQRS interval
Baseline-corrected and placebo-adjusted QRS interval
ΔΔQT interval
Baseline-corrected and placebo-adjusted QT interval
ΔΔQTcF interval
Baseline-corrected and placebo-adjusted QTcF interval
DAE
Adverse event leading to the discontinuation of IMP
DCF
Data clarification form
DES
Data Entry Site – where serious adverse event reports from AstraZeneca 
Clinical studies are entered onto the AstraZeneca Patient Safety database by 
Tata Consultancy Services
dECG
Digital electrocardiogram
DILI
Drug-Induced Liver Injury 
DMP
Data management plan
DNA
Deoxyribonucleic acid
DRESS
Drug rash with eosinophilia and systemic symptoms
DVS
Data validation specification
ECG
Electrocardiogram
ELISA
Enzyme-linked immunosorbent assay
eGFR
Estimated glomerular filtration rate
EClysis©
User-interactive, modular computer-based system for dECG data processing, 
analysis and measurement of ECG intervals and wave amplitudes, exports and 
reports, used by the AstraZeneca ECG Centre 
EMA
European Medicines Agency
ER
Extended-release
FDA
Food and Drug Administration
FSH
Follicle-stimulating hormone
GCP
Good Clinical Practice
gCV(%)
Geometric coefficient of variation
GGT
Gamma glutamyl transpeptidase (transferase)
GI
Gastrointestinal
gmean
Geometric mean
GMP
Good Manufacturing Practice
gSD
Geometric standard deviation
Hb
Haemoglobin
HBsAg
Hepatitis B surface antigen
HCT
Haematocrit
HCV
Hepatitis C virus
hERG
Human ether-a-go-go-related gene
HIV
Human immunodeficiency virus

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Abbreviation or 
Special Term
Explanation
HL
Hy’s Law
HLA
Human leukocyte antigen
HLA-B
Human leukocyte antigen B 
HR
Heart rate
IATA
International Airline Transportation Association
IB
Investigator’s Brochure 
ICF
Informed Consent Form
ICH
International Council for Harmonisation
IEC
Independent Ethics Committee
INR
International normalised ratio
IMP
Investigational medicinal product
IR
Immediate-release
IRB
Institutional Review Board
ISRB
Investigational Medicines Safety Review Board
IUD
Intrauterine device
λz
Terminal elimination rate constant
λzN
Number of data points included in the log-linear regression analysis
LLOQ
Lower limit of quantification
Max
Maximum
MCH
Mean corpuscular haemoglobin
MCHC
Mean corpuscular haemoglobin concentration
MCV
Mean corpuscular volume
MedDRA
Medical Dictionary for Regulatory Activities
Min
Minimum
MRT
Mean residence time of the unchanged drug in the systemic circulation from 
zero to infinity
ms
milliseconds
N
Number of subjects
n
Number of data values
NA
Not applicable
NC
Not calculated
NOEL
No observed effect level
NQ
Not quantifiable
NR
No result
NS
No sample
OAE
Other significant adverse events
PD
Pharmacodynamics
PDF
Portable Document Format

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Abbreviation or 
Special Term
Explanation
PDS
Protocol deviation specification (document)
PHL
Potential Hy’s Law
PI
Principal Investigator
PK
Pharmacokinetics
PR (PQ)
ECG interval measured from the onset of the P wave to the onset of the QRS 
complex
PT
Preferred term
Q&A
Question and Answers
QRS
ECG interval measured from the onset of the QRS complex to the J point
QT
ECG interval measured from the onset of the QRS complex to the end of the T-
wave
QTc
QT interval corrected for heart rate
QTcB
QT interval corrected for heart rate using Bazett's formula
QTcF
QT interval corrected for heart rate using Fridericia’s formula
R&D
Research and Development
RBC
Red blood cell
RNA
Ribonucleic acid
RR
The time between corresponding points on 2 consecutive R waves on ECG
Rsq-adj
Regression coefficient adjusted for λzN, Goodness-of-fit statistic for calculation 
of λz
RCTC
Rheumatology Common Toxicity Criteria
RT-PCR
Reverse transcriptase polymerase chain reaction
SAE
Serious adverse event (see definition in Section 13.1.2).
SARS-CoV-2
Severe acute respiratory syndrome coronavirus 2
sCR
Serum creatinine
SD
Standard deviation
SOC
System Organ Class
SOP
Standard operating procedure
SJS/TEN
Stevens-Johnson syndrome/toxic epidermal necrolysis
sUA
Serum uric acid
SUSAR
Suspected unexpected serious adverse reaction
t½
Terminal half-life
t½λz
Half-life associated with terminal slope (λz) of a semi-logarithmic 
concentration-time curve
TBL
Total bilirubin 
TCA
Tricyclic anti-depressant
TCS
Tata Consultancy Services – an AstraZeneca partner who conduct data entry 
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Abbreviation or 
Special Term
Explanation
tlag
Time delay between drug administration and the first observed concentration in 
plasma
tlast
Time of last quantifiable plasma concentration
t lower
Start of exponential fit
tmax
Time to reach maximum observed plasma concentration
t upper
End of exponential fit
TSH
Thyroid-stimulating hormone
UA
Uric acid
UK
United Kingdom
ULN
Upper limit of normal
US
United States
Vss/F
Apparent volume of distribution at steady state
Vz/F
Apparent volume of distribution during the terminal phase after extravascular 
administration (parent drug only)
WAD
Window Allowance Document
WBC
White blood cell
WHO
Word Health Organization
XO
Xanthine oxidase 
XOI
Xanthine oxidase inhibitor

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3.
ETHICAL AND REGULATORY REQUIREMENTS
3.1.
Ethical Conduct of the Study
The study will be performed in accordance with ethical principles that have their origin in 
the Declaration of Helsinki (version 1996) and are consistent with International Council 
for Harmonisation (ICH) Good Clinical Practice (GCP) and the AstraZeneca policy on 
Bioethics and Human Biological Samples.
3.2.
Subject Data Protection
The Informed Consent Form (ICF) will incorporate (or, in some cases, be accompanied by 
a separate document incorporating) wording that complies with relevant data protection 
and privacy legislation.
All clinical study findings and documents will be regarded as confidential.  The 
Investigator and members of his/her research team must not disclose such information 
without prior written approval from the Sponsor.
The anonymity of participating subjects must be maintained.  Subjects will be specified in 
outputs and other documents containing subject data by their subject number, not by name.  
Documents that identify the subject (eg, signed ICF) will be maintained in confidence by 
the Investigator.
Study data will be stored in accordance with local and global data protection laws.
3.3.
Ethics and Regulatory Review
The study will be submitted to the national regulatory agency (Federal Institute for Drugs 
and Medical Devices [BfArM]) for review and approval, by Parexel in accordance with 
local regulatory procedures.
The study will be submitted to the Independent Ethics Committee (IEC) for ethical review 
and approval by the Investigator in accordance with local procedures.
Parexel will provide the IEC and Investigator with safety updates/reports according to 
local requirements, including Suspected Unexpected Serious Adverse Reactions 
(SUSARs), where relevant.
AstraZeneca will provide the regulatory authority with safety updates/reports according to 
local requirements, including SUSARs, where relevant.
Compensation will be reasonable and related to the nature and degree of inconvenience 
and discomfort as a result of participation in the study.  Information on how participants 
will be compensated is contained in the ICF.

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3.4.
Insurance
The Sponsor has covered this clinical study by means of an insurance of the clinical study 
according to national requirements.  The name and address of the relevant insurance 
company, the certificate of insurance, the policy number and the sum insured are provided 
in the Investigator's Site File.
3.5.
Informed Consent
The subjects shall be informed of the nature, significance, implications and risks of the 
trial, and informed consent will be freely given and evidenced in writing, dated and signed, 
or otherwise marked, by the subject as evidence to indicate his/her free informed consent, 
prior to the start of the study.
The nature of the informed consent will comply with the Declaration of Helsinki 
(version 1996), the current requirements of GCP (CPMP/ICH/135/95) and local regulation 
which ever offers the greater subject protection.
3.6.
Changes to the Protocol and Informed Consent Form
Study procedures will not be changed without the mutual agreement of the Investigator
and AstraZeneca.
If there are any substantial changes to the study protocol, then these changes will be 
documented in a study protocol amendment and where required in a new version of the 
study protocol.
If a protocol amendment requires a change to the ICF the IEC should approve the revised 
ICF before the revised form is used.
If local regulations require, any administrative change will be communicated to or 
approved by the IEC.

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4.
INVESTIGATORS AND STUDY ADMINISTRATIVE 
STRUCTURE
Sponsor:
AstraZeneca AB
151 85 Södertälje
Sweden
Sponsor’s Lead 
Physician:
AstraZeneca R&D Gothenburg
431 83 Mölndal
Sweden
Tel: 
Mobile: 
E-mail: 
Sponsor’s Lead 
Clinical Scientist
AstraZeneca R&D Gothenburg
431 83 Mölndal
Sweden
Tel: 
Mobile: 
E-mail: 
Sponsor’s 
Biostatistician:
AstraZeneca R&D Gothenburg
431 83 Mölndal
Sweden
E-mail: 
Principal 
Investigator (PI):
Thomas Kӧrnicke, MD
Parexel Early Phase Clinical Unit Berlin
14050 Berlin
Germany
Tel.:
E-mail: 
Deputy PI:
Parexel Early Phase Clinical Unit Berlin
14050 Berlin
Germany
Tel.:
E-mail:
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD

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Contract Research 
Organization 
(CRO):
Parexel Early Phase Clinical Unit Berlin
14050 Berlin
Germany
Tel: 
Clinical 
Laboratory:
SYNLAB Analytics & Services Germany GmbH
10559 Berlin
Germany
Contact: 
Tel: 
Fax: 
E-mail: 
Electrocardiogram 
(ECG) Core 
Laboratory:
AstraZeneca ECG Centre
Cardiovascular Safety Centre of Excellence 
Patient Safety Centre of Excellence CMO Organization
AstraZeneca Gothenburg
431 83 Mölndal
Sweden
Contact:
 
Tel: 
E-mail: 
Pharmacy:
Hubertus-Apotheke
10587 Berlin
Germany
Contact:
Tel: 
E-mail: 
Parexel 
Laboratory 
Contact:
Parexel International GmbH,
14050 Berlin
Germany
Contact:
Tel.: 
E-Mail: 
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD

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Analytical 
Laboratory:
(pharmacokinetic 
[PK] sample 
analysis)
Covance Bioanalytical Services, LLC
Indianapolis, IN 46214
United States of America
Contact:
E-mail: 
Tel: 
Fax: 
Human leukocyte 
antigen (HLA)
sample analyses
DNA Identification Testing Division
Laboratory Corporation of America Holdings
Burlington, NC 27215-3361
United States of America
Contact:
E-mail: 
Tel : 
Adverse Event 
Reporting:
AstraZeneca Patient Safety Data Entry Site
Tata Consultancy Services
Fax: 
E-mail: 
A list and contact details of Investigators and other key study team members are provided 
in the Project Plan in the electronic Investigator’s Site File.  A list of all participating 
Investigators will be provided in the clinical study report (CSR).
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD
PPD

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5.
INTRODUCTION
5.1.
Background Information
Purines are essential building blocks in all living organisms. Adenosine triphosphate, the 
cellular carrier of energy, is a purine; furthermore, purines, together with pyrimidines,
make up DNA and RNA, the bearers of genetic information.  Metabolism of endogenous 
and ingested purines results in the production of urate.  In contrast to many lower species, 
the human body is unable to metabolise urate further and therefore eliminates urate 
through excretion.  Urate is excreted primarily through the kidneys, but also into the 
intestines, where it can be degraded by uricase activity in the intestinal microbiome to 
carbon dioxide and allantoin [1].
Uric acid (UA), the protonated form of urate, can also be found in the human body.  At 
physiological pH, approximately 1% of the circulating urate is in the form of UA, but in 
urine the fraction of excreted urate present in the form of UA increases with lower urinary 
pH.
The level of urate in the circulation is determined by the balance between production and 
elimination.  At steady state, production and elimination are similar [1].
Pharmacological modification of the levels of urate is possible through multiple 
mechanisms:  

Inhibition of xanthine oxidase (XO), a key enzyme in the transformation of purines 
into urate, lowers serum urate by decreasing production.  

Inhibition of URAT1, a key transporter responsible for reabsorption of urate from the 
primary urine in the proximal tubule of the kidneys, lowers serum urate by increasing 
renal excretion. 

Intravenous administration of drugs with uricase activity such as rasburicase, 
decreases serum urate by directly degrading urate.
Hyperuricaemia (elevated levels of urate in the circulation) is a prerequisite for 
development of gout, an inflammatory arthritis caused by deposition of monosodium urate 
crystals in joints.  Gout can occur in patients with serum urate >6.8 mg/dL, which is the 
solubility limit of monosodium urate.  The prevalence of gout increases with higher serum 
urate [2].  Gout affects approximately 4% of the adult United States (US) population [3].  
The prevalence of hyperuricaemia is higher than the prevalence of gout, as not all subjects 
with hyperuricaemia develop gout.
Hyperuricaemia without clinical symptoms (eg, gouty attack [acute gouty arthritis], gouty 
tophus, renal disorder) is called “asymptomatic hyperuricaemia” [4].  In the US and 
Europe, asymptomatic hyperuricaemia is not an approved indication for urate-lowering 
therapy.  The Japanese and Chinese treatment guidelines propose that urate-lowering 
therapy should be considered for patients with asymptomatic hyperuricaemia with a serum 

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uric acid (sUA) level of ≥8.0 mg/dL with complications (eg, urinary calculus, renal 
disease, and hypertension) and ≥9.0 mg/dL without complications [5, 6].
Evidence shows independent associations between elevated sUA and the risk of 
hypertension, myocardial infarction, heart failure, Chronic Kidney Disease, type 2 
diabetes, and metabolic syndrome, including obesity [7, 8, 9, 10, 11].  Gout is associated 
with an increased risk of all-cause death, as well as cardiovascular death [12, 13, 14].  
However, the causal relationship between elevated sUA and the aforementioned diseases 
and outcomes remains to be proven.
Potent URAT1 inhibition monotherapy has previously been associated with serum 
creatinine elevations.  Although the mechanism is yet to be proven, these URAT1 effects 
with monotherapy have been linked to increased concentrations of UA in the primary 
urine, which have the potential to induce uric acid crystallization in tubuli and collecting 
ducts.
Based on these findings, verinurad, a novel URAT1 inhibitor assess in this study, will be 
exclusively developed as combination therapy, together with a xanthine oxidase inhibitor 
(XOI). This combination aims to provide a dual mechanism for lowering sUA and to 
reduce the risk of potential crystallization of UA in the renal tubules.  However, when 
necessary for the development, verinurad monotherapy may be used in specific clinical 
studies applying appropriate safety monitoring and risk mitigation.
The Investigator’s Brochure (IB) describes results from pre-clinical studies, clinical 
pharmacology studies, and clinical monotherapy and combination therapy with febuxostat 
or allopurinol [15].
5.1.1.
Background to COVID-19
There is currently an outbreak of respiratory disease (COVID-19) caused by the novel 
virus SARS-CoV-2 that was first detected in Wuhan City, Hubei Province, China in 2019. 
This new virus has rapidly spread across the globe causing the World Health Organization 
(WHO) to declare a pandemic situation on 11 March 2020. The countermeasures initiated 
by national and local governments worldwide and the recommendations issued by the 
health authorities have impacted current and new clinical studies. As the threat of 
pandemic burden including new outbreaks, locally or globally, will impact the further 
conduct of clinical studies, appropriate risk assessments and mitigation measures will need 
to be taken into consideration in all clinical studies to protect subjects, site staff and 
society as a whole.
Both European Medicines Agency (EMA) [16] and Food and Drug Administration (FDA)
[17], as well as national health authorities in Europe, have issued new guidelines that aim 
to provide recommendations for actions for conduct of clinical studies of medical products 
during COVID-19 pandemic. Since the pandemic situation is evolving, guidelines, 
recommendations, national laws and local restrictions may change at high pace. Given the 
circumstances of potentially relapsing pandemic or epidemic situation with regard to the 

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spread of COVID-19 in future, special attention will be paid to protect subjects 
participating in the study and site staff involved in the investigations against infection with 
SARS-CoV-2 as requested by the newly issued EMA guideline.
5.2.
Drug Information
5.2.1.
Verinurad
5.2.1.1.
Description of Verinurad
Verinurad (also known as RDEA3170) is a potent and specific URAT1 inhibitor.  URAT1 
is responsible for most of the reabsorption of filtered UA from the renal tubular lumen.  By 
inhibiting URAT1, verinurad increases urine UA excretion and thereby lowers sUA.
5.2.1.2.
Pre-clinical Data Related to Cardiovascular Safety
Verinurad was tested for its effect on the human ether-a-go-go-related gene 
(hERG)-encoded potassium channel at concentrations of 10 and 300 μM.  Verinurad 
inhibited the potassium current by less than 3% at concentrations of 10 and 300 μM. 
The effects of verinurad on arterial blood pressure, heart rate (HR), lead II 
electrocardiogram (ECG) and body temperature were investigated in telemetered male 
Beagle dogs for up to 24 hours following single oral doses up to 300 mg/kg.  Verinurad at 
300 mg/kg resulted in a trend towards a decrease in blood pressure and increase in HR (not
statistically significant).  There was a statistically significant decrease in PR interval (of 
approximately 13 ms) at this dose level, which was considered to be related to the trend 
towards an increase in HR.  The no observed effect level (NOEL) was considered to be 
150 mg/kg.  This dose level was associated with a maximum plasma concentration (Cmax)
value of 172 μg/mL in male dogs on Day 1 of the 28-day repeat-dose toxicity study.  
Assuming a plasma protein binding of 97.8%, this equates to a free plasma concentration 
of 3.8 μg/mL.
5.2.1.3.
Clinical Pharmacokinetics
Following administration of verinurad as an extended-release capsule formulation (ER8), 
Cmax occurred 4 hours after dosing.  Food did not affect verinurad exposure except for a
2-hour increase in time to maximum plasma concentration (tmax).  The degree of protein 
binding of verinurad in human plasma was 97%.  Glucuronidation is the major metabolic 
pathway of verinurad with oxidation as the minor pathway.  The major metabolites 
observed in humans after oral verinurad dosing are the acyl glucuronides M1 and M8 
which are renally cleared.  The amount of verinurad in urine is small (<2% of given dose). 
The terminal half-life (t½) of verinurad was 13 hours in subjects with normal renal 
function and 21 hours in those with moderate renal impairment.  The exposure (area under 
the concentration-time curve [AUC] and Cmax) of verinurad increased in a dose-
proportional manner and the accumulation was minimal after once daily dosing.  Subjects 
with an estimated glomerular filtration rate (eGFR) of 45 and 60 mL/min/1.73m2 are
predicted to have a 1.4 and 1.2-fold higher verinurad exposure, respectively, compared to 
those with normal renal function (eGFR of 90 mL/min/1.73m2).  Asian subjects are 

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predicted to have about 44% higher exposure compared to non-Asians after accounting for 
differences in renal function and body weight.
Further information on pharmacokinetics (PK) findings (including PK parameters of the 
verinurad immediate-release [IR] formulation) is available in the IB [15].
5.2.1.4.
Safety Profile Derived from Clinical Studies
Verinurad has been studied in healthy subjects, patients with gout and renally-impaired 
patients.  In total, 849 subjects have received verinurad in 11 Phase I and 7 Phase II
clinical studies (data as of 01 Nov 2019).  
Safety in healthy subjects was assessed in a pooled analysis of 8 Phase I (Studies 101, 103, 
104, 105, 106, 110, 111, and 112) and in a single Phase I study (D5495C00006). A 
summary of information on clinical safety findings in healthy subjects is provided below; 
further details are available in the IB [15].
Adverse Events
The 8 pooled Phase I studies collectively enrolled 293 male subjects, treated at doses 
ranging from 5 to >15 mg; 94.5% of the subjects completed the planned treatment.  
Overall, 86 subjects (29.4%) experienced adverse events (AEs).  The incidence of AEs 
was similar among the pooled verinurad groups and pooled placebo groups.  The most 
common AE was headache, which occurred in 12 subjects (4.1%).  There was no apparent 
relationship between the incidence of these AEs and verinurad dose.  Most AEs were 
Rheumatology Common Toxicity Criteria (RCTC) toxicity Grade 1. Only 2 AEs had an 
RCTC toxicity >Grade 2, consisting of Grade 3 blood creatinine increased and Grade 3 
tooth infection, both reported in subjects treated with verinurad doses ranging from 5 to 
<10 mg. There were no serious adverse events (SAEs).  Three subjects withdrew from the 
study due to AEs: 2 subjects who had received verinurad 5 mg (dehydration and influenza, 
respectively) and 1 subject who had received verinurad 15 mg and experienced urticaria.
Study D5495C00006 was a double-blind safety and PK study in healthy Asian and 
Chinese subjects who were randomised to receive verinurad + allopurinol or placebo.  No 
deaths or SAEs were reported in the study and no subject discontinued study treatment due 
to an AE.  All AEs reported on study treatment were mild in intensity.
Laboratory Evaluations
In the pooled analysis of the 8 Phase I studies, serum creatinine (sCr) elevations 
≥1.25 × baseline and ≥1.5 × baseline were reported for 13.7% and 1.7% of subjects, 
respectively.  A change from baseline ≥0.3 mg/dL was reported for 6.8% of all subjects.  
There was no apparent relationship between sCr elevation and dose of verinurad.  
Furthermore, 18.4% of all subjects treated with verinurad experienced alanine 
aminotransferase (ALT) elevations ≥1.5 × baseline, 5.1% experienced elevations ≥2.0 × 
baseline, and 2.0% experienced elevations ≥3.0 × baseline.  There was no clear 
relationship with dose.  Aspartate aminotransferase elevations ≥1.5 × baseline were 

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reported for 6.1% of all subjects, while <1.5% of subjects experienced aspartate 
aminotransferase (AST) elevations ≥2.0 or ≥3.0 × baseline.
In Study D5495C00006, no subjects on verinurad + allopurinol had an elevation >3.0 ×
upper limit of normal (ULN) for ALT or AST or >2.0 × ULN for total bilirubin. No sCr 
elevation ≥1.5 × baseline was observed in the study. 
Vital Signs, Physical Findings, and Other Observations
In the 9 Phase I studies, there were no clinically relevant or apparent dose-related 
post-treatment changes in vital signs.  Although transient changes in blood pressure, HR
and body temperature were noted at isolated time points for some subjects, none of these 
findings were judged to be clinically significant by the Investigator.
Electrocardiogram Data
In 8 of the Phase I studies in healthy subjects there were no apparent treatment or 
dose-related trends in the 12-lead ECG parameters and no clinically important findings in 
the morphology of the 12-lead ECG for individual subjects.  However, in 1 study 
(Study 101), prolongations in QT interval corrected for heart rate using Bazett's formula
(QTcB) of >60 ms occurred in 2 subjects in the 1 mg fasted dose group; yet, no subjects 
had prolonged QTcB intervals >450 ms.  Three subjects in the 1 mg fasted dose group and 
1 subject in the 5 mg fasted dose group had prolonged QT intervals corrected for heart rate 
using Fridericia’s formula (QTcF) (>450 to 480 ms) although no subjects had a QTcF 
interval >480 ms. All episodes of QTcF >450 ms occurred at HRs <50 beats per minute 
[bpm].
Subjects with Gout or Asymptomatic Hyperuricemia
Information on clinical safety findings in subjects with gout or asymptomatic 
hyperuricemia is available in the IB [15].
5.2.2.
Allopurinol
Allopurinol is a commercially available oral XO inhibitor for conditions where urate/UA 
deposition has already occurred or is a predictable clinical risk. Allopurinol and its main 
metabolite oxipurinol lower the level of UA.
Please refer to the product information sheet of allopurinol tablets [18] for information on 
PK, PD and safety.
5.3.
Study Rationale and Justification of Study Design
5.3.1.
Study Rationale
A prolongation of the QT and/or QTc interval can be associated with increased 
susceptibility to cardiac arrhythmias. Therefore, according to the ICH Guideline E14 and 
associated Questions and Answers (Q&A) document [20], adequate investigation of the 
safety of new non-antiarrhythmic drugs with systemic bioavailability should include 

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rigorous characterisation of their effects on ECG, with particular focus on the QT and QTc 
interval.
Available pre-clinical (including hERG and in vivo data), clinical ECG and event data 
have not indicated liability for QT-prolongation for verinurad.
The present randomised, double-blind, placebo-controlled study will follow the ICH E14 
guidelines (2005) [19] and answers to question 5.1 in the associated ICH E14 Q&A 
document (2015) [20] with respect to assessment of the potential of the combination of 
verinurad and allopurinol to affect the QTc interval, where concentration-QTc (C-QTc) 
modeling will be used as the primary analysis [20, 21]. It is considered that the 
supra-therapeutic dose, if it covers at least more than twice the worst-case scenario of high 
exposure in patients, will provoke a detectable clinically relevant QT/QTc prolongation,
even if the sensitivity/quality of the ECG analytical method is not proven to be perfect in 
the study. It can, therefore, be acceptable not to use an active control, provided the supra-
therapeutic dose fulfills such criteria.  The answer to question 5.1 of the ICH E14 Q&A 
document states that a separate positive control would not be necessary if there are data 
characterising the response at a sufficiently high multiple of the clinically relevant 
exposure, and this criterion is fulfilled by the supra-therapeutic exposure of verinurad
anticipated in this study.  A cross-over design has been chosen for practical reasons since 
fewer volunteers will be required and because each volunteer acts as his or her own 
control; intra-subject variability is therefore reduced.  A single-dose cross-over design is 
chosen based on the PK characteristics of verinurad, allopurinol, and their metabolites. The 
collection of PK samples and digital ECG (dECG) recordings is time matched to allow the 
use of pre-specified linear mixed-effects model [21].
5.3.2.
Overall Study Design
This study will be a single-centre, randomised, placebo-controlled, double-blind, 3-period, 
cross-over Phase I study to assess the effect on the QTcF interval of a single oral dose of 
verinurad 24 mg ER8 formulation (therapeutic exposure) or verinurad 40 mg IR
formulation (supra-therapeutic exposure), each in combination with allopurinol 300 mg, 
compared to placebo in healthy subjects. 
There are 3 study treatments (see also Table 9-3):

Treatment A: Verinurad 24 mg ER8 formulation co-administered with 300 mg 
allopurinol

Treatment B: Verinurad 40 mg IR formulation co-administered with 300 mg 
allopurinol

Treatment C: Matched placebos for both verinurad and allopurinol
All subjects will receive a single dose of all 3 treatments (A, B, and C) in a cross-over 
design with wash-out periods of at least 7 days between each study dose administration.  
Subjects will be randomised to the treatment sequence (ABC, BCA, CAB, etc.) using 

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William’s Latin square. The treatments will be administered in a double-blind manner
after an overnight fast of at least 10 hours.
There will be 5 visits to the study centre, including 3 visits that are residential.  The study 
will comprise the following periods and visits:

A Screening Period of maximum 28 days (Visit 1);

Three treatment periods of 3 days each, during which subjects will be resident at the 
study centre from the morning of the day before administration of the study dose
(check-in, Day -1) until discharge 2 days after study dose administration (check-out, 
Day 3; Visits 2 to 4);

Wash-out periods of at least 7 days between each study dose administration;

A final visit within 7 to 10 days after the last study dose administration (Follow-up 
Visit; Visit 5).
A total of 24 subjects are planned to be randomised to achieve at least 20 evaluable 
subjects.  
The study design is deemed appropriate for conduct in healthy volunteers during 
COVID-19 pandemic.
5.3.2.1.
End of Study
The end of study is defined as the last subject’s last visit to the study centre.
5.3.2.2.
Expected Duration of the Study
Each subject will be involved in the study for approximately 53 days (see Table 5-1).

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Table 5-1
Expected Duration of Each Study Part
Screening
Maximum 28 days before the first study dose
Treatment Periods
3 treatment periods of 3 days each during which subjects will be resident at 
the study centre from the day before dosing (Day -1) until discharge on Day 3
Wash-out Period
At least 7 days between each study dose administration
Follow-up
7 to 10 days after last dose
Total Duration
Approximately 53 days
5.3.3.
Study Flow Chart and Schedule of Assessments
The flow of events is illustrated in Figure 5-1 for all treatments, depending on the subject’s 
assigned randomisation (refer to Section 9.9.2).
The Schedule of Assessments displaying assessments/tasks and time points is presented in 
Table 5-2.  The time schedule for dECGs is presented in Table 5-3.

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Figure 5-1
Study Flow Chart
Visit 1
Informed consent and Screening
(≤28 days)
Visit 2
Treatment Period 1
Randomisation (Day -1)
Wash-out Period
at least 7 days
Visit 3
Treatment Period 2
Wash-out Period
at least 7 days
Visit 4
Treatment Period 3
Visit 5
Follow-up
7 to 10 days after last dose
Note: All subjects will receive all 3 treatments (A, B and C) in a cross-over design; 1 treatment per treatment 
period (Treatment Periods 1, 2, and 3).  Treatment sequence (ABC, BCA, CAB, etc.) will be assigned 
randomly and the study doses administered in a double-blind manner.
The composition of Treatment A, B, and C is detailed in Table 9-3.

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Table 5-2
Schedule of Assessments
Study Assessments
Visit 1 a
Screening
Day −28 to 
Day -2
Visits 2 to 4 b
Treatment
Days -1 to 3 (Residential)
Visit 5
Follow-up
7 to 10 Days 
After the Last 
Dose c
Corresponding 
Section in Protocol
Day −1
Days 1 to 3
Informed consent
X
Section 3.5
Demographics
X
Section 12.7
Medical/surgical history
X
Section 12.7
Physical examination
X
X d
X
Section 12.12.5
Sample for HLA-B*58:01 allele
genotyping
X
Section 10.4.2.3
Inclusion/exclusion criteria
Xe
Xe
Section 7.1
Weight, height and BMI
X
Section 12.7
Study residency
Check-in
X (in the 
morning)
Section 5.3.2
Check-out
Day 3 (after the 48 hour post-dose assessment)
Section 5.3.2
Non-residential visit
X
X
Section 5.3.2
Safety and tolerability
AE questioning f
X
X
Day 1: pre-dose, 4 and 12 hours post-dose
Day 2: 24 hours post-dose
Day 3: 48 h post-dose
X
Section 10.4.1
Concomitant medication
X
X
X
X
Section 9.7
Blood pressure and pulse (supine)
X
X
Day 1: pre-dose, 1 and 6 hours
Day 2: 24 hours post-dose
Day 3: 48 h post-dose
X
Section 10.4.3
Body temperature g
X
X
X
X
Section 10.4.3

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Study Assessments
Visit 1 a
Screening
Day −28 to 
Day -2
Visits 2 to 4 b
Treatment
Days -1 to 3 (Residential)
Visit 5
Follow-up
7 to 10 Days 
After the Last 
Dose c
Corresponding 
Section in Protocol
Day −1
Days 1 to 3
12-lead safety ECG h
X
X
X
X
Section 10.4.4.1
Continuous 12-lead dECG i
See time schedule for dECG in Table 5-3
Section 10.4.4.2
Telemetry j
X
X
Section 10.4.5
Safety Laboratory sampling k
X
X
Day 3: 48 hours post-dose
X
Sections 10.4.2.1,
10.4.2.2, and 10.4.2.4
Urine drug and alcohol screen
X
X l
Section 10.4.2.7
Pregnancy test m
X
X
X
Section 10.4.2.5
HIV status/hepatitis B and C screen, 
anti-HBc antibody 
X
Section 10.4.2.6
COVID-19 Assessments
Pre-visit phone call n
X
X
X
Section 5.5.1
SARS-CoV-2 RT-PCR
X
Section 10.4.2.6
SARS-CoV-2 antibody
X
Section 10.4.2.6
Study drug administration
Randomisation o
X
Administration of study dose 
Day 1 (0 h)
Sections 5.3.2 and 9.6
Pharmacokinetics
Blood sampling for analysis of verinurad, 
M1, M8, allopurinol and oxypurinol 
plasma concentrations
Day 1: Pre-dose, 0.5, 1, 1.5, 2, 3, 4, 5, 6, 8, and 
12 hours post-dose
Day 2: 24 and 36 hours post-dose
Day 3: 48 hours post-dose
Section 10.3.1
AE: Adverse events; BMI: Body mass index; COVID-19: Coronavirus disease 2019; dECG: Digital electrocardiogram; ECG: Electrocardiogram; HBc: Hepatitis B core; 
HIV: Human immunodeficiency virus; HLA-B: Human leukocyte antigen B; RT-PCR: Reverse transcriptase polymerase chain reaction; SARS-CoV-2: Severe acute 
respiratory syndrome coronavirus 2; sUA: Serum uric acid.

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Study Assessments
Visit 1 a
Screening
Day −28 to 
Day -2
Visits 2 to 4 b
Treatment
Days -1 to 3 (Residential)
Visit 5
Follow-up
7 to 10 Days 
After the Last 
Dose c
Corresponding 
Section in Protocol
Day −1
Days 1 to 3
a
Screening Visit may occur up to 28 days prior to Day 1 of the first treatment period and may be divided into 2 separate occasions.
b
Each treatment visit will comprise Day -1 to Day 3 (48 hours post-dose).
c
Follow-up visit will occur at approximately 7 to 10 days after the last dose.  This visit is also applicable to subjects who prematurely discontinue from the study.
d
A full physical examination is performed at Visits 1 and 5.  A brief physical examination is performed pre-dose on Day -1 of Visits 2, 3, and 4, to reconfirm subject’s 
eligibility.
e
sUA must be ≤300 μmol/L at Screening Visit (Visit 1) and ≤330 μmol/L at any treatment visit (Visits 2 to 4).
f
All AEs will be collected from the time of randomisation through Visit 5 (Follow-up Visit); SAEs will be collected from the time of obtaining informed consent 
through Visit 5 (Follow-up Visit).
g
Body temperature will be measured at least once daily (in the morning) at every visit or during in-house stay. 
h
12-lead safety ECG for safety review by the Investigator will be performed prior to the dECG recordings and at additional intervals if required.
i
Continuous 12-lead dECG recordings with extractions (from 12-lead Telemetry Surveyor continuous files) of multiple 10-second replicates will be performed for 
20 minutes pre-dose and as 5-minute recordings post-dose at time points specified in Table 5-3.
j
Telemetry will be monitored for 4 to 6 hours at Treatment Period 1 (Visit 2), Day -1.  Subjects with clinically significant abnormalities (eg, high burden of 
extrasystoles, etc.) will not be randomised.  During Treatment Periods 1 to 3 (Visits 2 to 4) telemetry will be monitored from 30 minutes pre-dose through 24 hours 
post-dose.
k
Blood (haematology and clinical chemistry) and urine (urinalysis). 
l
To be performed at admission to the study centre for each treatment period.
m
Serum pregnancy test at Screening, urine pregnancy test at admission to the study centre for each treatment period and at the Follow-up Visit.
n
Phone calls will be made 1 day prior to each visit to record signs and symptoms of COVID-19 or any contact with persons having confirmed SARS-CoV-2 infection.  
In case of signs or symptoms or contact, the visit will be cancelled and reason for cancellation will be appropriately documented.
o
Randomisation will occur on Visit 2 (Day -1).

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Table 5-3
Study Plan - Time Schedule for Digital Electrocardiogram Assessments During Residential Period (Visits 2, 3 and 4)
Study 
Day
ECG 
Number
Time Point
Time: 
Start of the Extraction 
Window, Hour:Minute
Dose
Time: 
Stop of the Extraction 
Window, Hour:Minute
dECG Continuousa,b,c,d
Other
1
-01:10
Apply electrodes b
1
1
Pre-dose
-00:40
-00:20
20 minutes
1
Pre-dose
-00:20
-00:10
Toilet use recommended
1
IMP 
administration
00:00
IMP 
administration
1
2
0.5 hour
00:25
00:30
5 minutesc
1
3
1 hour
00:55
01:00
5 minutesc
1
4
1.5 hours
01:25
01:30
5 minutesc
1
5
2 hours
01:55
02:00
5 minutesc
1
6
3 hours
02:55
03:00
5 minutesc
1
7
4 hours
03:55
04:00
5 minutesc
1
8
5 hours
04:55
05:00
5 minutesc
1
9
6 hours
05:55
06:00
5 minutesc
1
10
8 hours
07:55
08:00
5 minutesc
1
11
12 hours
11:55
12:00
5 minutesc
2
12
24 hours
23:55
24:00
5 minutesc
2
13
36 hours
35:55
36:00
5 minutesc
3
14
48 hours
47:55
48:00
5 minutesc
dECG: Digital electrocardiogram, ECG: Electrocardiogram; IMP: Investigational medicinal product
a
Subjects must be in the same supine body position (maximum 30 degrees flexion in the hip) at each time point and at all visits with feet out of contact with footboard.
b
Skin must be cleaned, and electrode positions marked with an indelible pen. Electrodes should be applied at least 30 minutes before the first recording.
c
The subjects must rest in bed for at least 10 minutes prior to each dECG time point.
d
The subject must remain awake.

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5.3.4.
Total Blood Volume
The approximate total amount of blood to be collected from each subject in this study, 
excluding repeat samples, is summarised in Table 5-4.
Table 5-4
Total Blood Volume
Volume per Sample
Number of Samples
Total
Haematology
2.7 mL
8
21.6 mL
Clinical chemistrya
7.5 mL
8
60.0 mL
HLA-B*58:01 allele genotyping
3.0 mL
1
3.0 mL
SARS-CoV-2 antibody ELISA
2.6 mL
1
2.6 mL
Pharmacokinetics
5.0 mL
45
225.0 mL
Total
312.2 mL
HLA-B: Human leukocyte antigen B; ELISA: Enzyme-linked immunosorbent assay; 
FSH: Follicle-stimulating hormone; SARS-CoV-2: Severe acute respiratory syndrome coronavirus 2.
a
When applicable, serology, serum pregnancy (females only) and FSH (females only) analyses will be 
performed on the sample collected for clinical chemistry analyses.
Repeat blood samples may be collected for safety reasons.  The maximum volume to be 
drawn from each subject must not exceed 500 mL.
5.3.5.
Order of Assessments
It is important that PK sampling occurs as close as possible to scheduled time.  In order to 
achieve this, other assessments scheduled at the same time may be initiated prior to the 
time point.  The sequence at a particular time point is:
1
Electrocardiograms (ECGs and dECG)
2
PK blood sampling (will be drawn at the specified time points)
3
Safety laboratory blood sampling
4
Vital signs
5
AE questioning
Pre-dose assessments (other than pre-dose PK assessments) may be performed up to 
90 minutes prior to investigational medicinal product (IMP) administration. Tolerance 
windows for the assessments will be detailed in the Window Allowance Document 
(WAD). 
5.4.
Dose Rationale
A single dose of 24 mg verinurad given as the ER8 formulation to healthy subjects will 
give similar exposure as the highest dose tested in Phase 2b (expected therapeutic 
exposure) at steady state in subjects with renal impairment [15]. Subjects with impaired 
renal function have <2-fold higher exposure compared to those with normal renal function. 

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To assess the assay sensitivity, the supra-therapeutic exposure should cover at least 
2× worst-case therapeutic exposure [21]. A single dose of 40 mg verinurad given as the IR 
formulation to healthy subjects will result in supra-therapeutic exposure (40 mg IR given 
to healthy subjects). The observed Cmax and AUC following 40 mg IR to healthy subjects 
was 760 ng/mL and 1270 ng*h/mL, respectively, which is 10-fold higher Cmax than 
worst-case clinical exposure. 
Allopurinol dose of 300 mg was chosen because this is the dose given in combination with 
verinurad in Phase 2b.
5.5.
Risk-benefit Assessment
There are no direct benefits for the subjects participating in this study.  However, 
study-related health assessments are provided without costs for the subjects.  The major 
risks for subjects who participate in the study will come from IMP administration.  In 
addition, there might be a slight risk of infection or bruising that might occur after 
insertion of an intravenous cannula for frequent blood sampling.
The main toxicity concern noted with verinurad monotherapy in healthy subjects is 
creatinine elevations >1.5 × baseline which occurred in 1.7% of healthy subjects.  A 
change from baseline of ≥0.3 mg/dL was reported for 6.8% of all subjects.  There was no 
apparent relationship between sCr elevation and dose of verinurad.  The creatinine 
elevations were primarily transient, and often resolved despite continued dosing with 
verinurad.  This risk is mitigated by combining verinurad with an XOI, excluding subjects 
with high uric acid and mandating hydration.  Further information is provided in the IB 
[15].
In previous studies, verinurad combined with allopurinol was well tolerated and associated 
with acceptable side effects.  Most AEs were minor and not related to treatment. 
Allopurinol is an approved XOI.  Most common AEs identified in the prescribing 
information are rash and blood thyroid-stimulating hormone increased.  Allopurinol 
hypersensitivity reactions can manifest in many different ways, including maculopapular 
exanthema, hypersensitivity syndrome (also known as drug rash with eosinophilia and 
systemic symptoms [DRESS]) and Stevens-Johnson syndrome/toxic epidermal necrolysis 
(SJS/TEN). The Human leukocyte antigen B (HLA-B)*58:01 allele has been shown to be 
associated with increased risk of developing allopurinol-related hypersensitivity syndrome 
and SJS/TEN. The frequency of the HLA-B*58:01 allele varies widely between ethnic 
populations: up to 20% in the Han Chinese population, 8 to 15% in the Thai population, 
about 12% in the Korean population and 1 to 2% in individuals of Japanese or European 
origin.  At the Screening Visit, the subject’s HLA-B*58:01 status will be tested and 
carriers of HLA-B*58:01 will be excluded [18].
Overall, the study has been designed to minimize the risks to participating subjects by 
excluding subjects at high risk of AEs and by applying appropriate safety monitoring of 
recruited study subjects.  The dose selected has been carefully considered in light of the 

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target subject population.  The potential benefits of developing a new treatment for chronic 
kidney disease with hyperuricemia, therefore, outweigh the limited risks to the subjects 
exposed to verinurad and allopurinol single doses in this study.
5.5.1.
Risk Assessment for COVID-19 Pandemic
Verinurad is a potent and specific URAT1 inhibitor. Allopurinol is a well-known drug to 
treat hyperuricemia. No impact on COVID-19 pandemic is expected in this 
healthy-volunteer study. 
Therefore, risk of the subjects to be exposed to SARS-CoV-2 or to suffer from COVID 19 
will be similar to the general population. However, the risk of exposure to infected people 
cannot be completely excluded as the subjects may need to expose themselves to public 
areas (eg, commute to the site) and have additional human contact (eg, with site staff and 
other participants of the clinical study).
Measures to mitigate the additional risks caused by COVID-19 are:

This study is going to restart enrolling only when the Sponsor and contract research 
organization (CRO) in collaboration deem it is safe to start the study.  In addition, the 
study will not start until the local confinement measures or other safety restrictions 
linked to the COVID-19 pandemic are lifted by the local authorities.

Current national laws and local recommendations for prevention of pandemic will be 
strictly adhered to.

Subjects will be closely monitored for any signs and symptoms of COVID-19, 
including fever, dry cough, dyspnoea, sore throat and fatigue throughout the study.  
Once clinical signs of infection are reported by subjects, the Investigator needs to 
determine whether samples can be collected, and safety data can be recorded on site.  
If not, AEs and concomitant medications will be obtained via phone calls.  Daily body 
temperature measurements during in-house stay and outpatient visits will be 
implemented.

The Investigator will not dose subjects upon identification of any signs of COVID-19 
infection.

Confirmation of COVID-19 infection by laboratory assessment will be conducted 
based on availability (test capacity and turnaround time) of approved tests and on 
Investigator’s discretion.  This would include serology testing at screening and virus 
testing prior to any admission.

The probability of virus transmission will be controlled as much as possible by:

Advice for subject to adhere to local requirements for reduction of the public 
exposure while ambulatory.

All subjects are contacted by phone 1 day prior to every visit for assessing 
COVID-19 symptoms and signs and are asked not to attend the site in case of 
suspected reports.  In addition, subjects are asked for any contact with a person 
who has tested positive for SARS-CoV-2.  If applicable, subjects will be referred 
to the local health care system for further follow-up and treatment.

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
Physical distancing and person-to-person contact restrictions will be applied 
during site visits and in-house stay.

Where physical distancing is not possible, personal protective equipment will be 
used by subject (surgical face mask, gloves) and staff (for example but not limited 
to masks, gloves, protectors, medical suits) if deemed appropriate by the 
investigators and site staff and guided by local requirements.

Logistical improvements of the site and structural measures of the study site 
building will be implemented to further improve physical distancing.

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6.
STUDY OBJECTIVES
6.1.
Primary Objective
Table 6-1
Primary Objective and Outcome Measures
Primary Objectives
Outcome Measures
To assess the effect of a single dose of verinurad 
given as either a 24 mg ER8 formulation 
(therapeutic exposure) or a 40 mg IR
formulation (supra-therapeutic exposure), both 
in combination with allopurinol 300 mg, on the 
QTcF interval compared to placebo using a 
concentration-QTcF interval analysis.
•
The primary outcome measure is ΔΔQTcF (derived 
from concentration-QTcF modeling).  
•
Parameters for this outcome measure are QTcF and 
Cmax.
See Section 2 for abbreviations.
6.2.
Secondary Objectives
Table 6-2
Secondary Objectives and Outcome Measures
Secondary Objectives
Outcome Measures
To investigate the effect of verinurad given 
either as a 24 mg ER8 formulation (therapeutic 
exposure) or a 40 mg IR formulation (supra-
therapeutic exposure), both in combination with 
allopurinol 300 mg, on HR and additional dECG 
variables (PR, QRS, QT and RR).
•
Baseline-corrected and placebo-adjusted dECG 
parameters (ΔHR, ΔΔHR, ΔRR interval, ΔΔRR 
interval, ΔPR interval, ΔΔPR interval, ΔQRS interval, 
ΔΔQRS interval, ΔQT interval, ΔΔQT interval, ΔQTcF 
interval, ΔΔQTcF interval).  
•
Parameters for this outcome measure are the dECG 
variables HR, RR, PR, QRS, QT and QTcF.
To assess the PK of verinurad and its 
metabolites (M1 and M8) and allopurinol and its 
metabolite (oxypurinol) in healthy subjects.
•
As appropriate and where possible, the following PK 
parameters will be assessed for verinurad, M1, M8, 
allopurinol, and oxypurinol: AUC, AUC0-t, Cmax, 
tmax, tlag, t½λz, tlast, CL/F, Vz/F, Vss/F and MRT.
•
Plasma concentration-time profile for each analyte.
To assess the relationship between plasma 
concentrations of verinurad, allopurinol and the 
metabolites M1, M8, oxypurinol and dECG 
variables and HR.
•
Plasma concentrations of verinurad, M1, M8, 
allopurinol, and oxypurinol and time-matched, 
baseline-corrected and placebo-adjusted dECG 
parameters (ΔHR, ΔΔHR, ΔRR interval, ΔΔRR 
interval, ΔPR interval, ΔΔPR interval, ΔQRS interval, 
ΔΔQRS interval, ΔQT interval, ΔΔQT interval, ΔQTcF 
interval, ΔΔQTcF interval).
•
Parameters for this outcome measure are the plasma 
concentration of each analyte at each time point and the 
time-matched dECG variables HR, RR, PR, QRS, QT 
and QTcF.
To examine the safety and tolerability of 
verinurad and allopurinol 
•
Assessment of AEs, laboratory variables (haematology, 
clinical chemistry and urinalysis), vital sign variables 
(systolic and diastolic blood pressure, pulse rate, body 
temperature), ECG parameters, telemetry findings and
physical examination findings.
See Section 2 for abbreviations.
6.3.
Exploratory Objective(s): Not Applicable

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7.
STUDY POPULATION
7.1.
Selection of Study Population
The Investigator should keep a subject Screening log of all potential subjects who 
consented and were subjected to Screening procedures.
Subjects who fail to meet the inclusion criteria or meet any exclusion criterion should not, 
under any circumstances, be randomised into the study.  There can be no exceptions to this 
rule.
This study will be conducted in healthy male and female subjects.  The study may not 
necessarily be balanced regarding gender.  It is not planned to perform sub-analyses on 
gender.
7.1.1.
Inclusion Criteria
For inclusion in the study subjects should fulfill the following criteria:
1
Provision of signed and dated, written informed consent prior to any study-specific 
procedures.
2
Healthy male and female subjects aged 18 to 50 years (inclusive) with suitable veins 
for cannulation or repeated venipuncture.
3
Females must have a negative pregnancy test at Screening and on admission to the 
study centre must be:
(1) Not pregnant or currently lactating or breast-feeding.
(2) Of non-childbearing potential (as defined in Section 7.2.1.1), confirmed at the 
Screening Visit by fulfilling one of the following criteria:
(i)
Post-menopausal defined as amenorrhea for at least 12 months or more 
following cessation of all exogenous hormonal treatments and 
follicle-stimulating hormone (FSH) levels in the post-menopausal range 
(FSH >40 IU/mL).
(ii) Documentation of irreversible surgical sterilization by hysterectomy, bilateral 
oophorectomy or bilateral salpingectomy but not tubal ligation.
(3) OR, if of childbearing potential, must be willing to use an acceptable method of 
contraception (see Section 7.2.1.2) to avoid pregnancy for the entire study period
and 3 months after the Follow-up Visit.
4
Have a body mass index (BMI) between 18 and 30 kg/m2 inclusive and weigh at least 
50 kg and no more than 100 kg inclusive.
5
sUA <300 μmol/L at Screening (Visit 1) and sUA <330 μmol/L on Day −1 in every 
treatment period (Visit 2 to 4). Note: Since sUA levels might vary on a daily basis, 
subjects with sUA ≥330 µmol/L on Day 1 will be retested. Treatment on Day 1 will 
only be administered when the sUA level on Day 1 is <330 µmol/L upon retesting.

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Subjects with sUA ≥330 µmol/L despite retesting, may conduct the treatment period 
at a later date when they have sUA <330 μmol/L.
6
Must be able to swallow multiple capsules/tablets.
7.1.2.
Exclusion Criteria
Subjects will not enter the study if any of the following exclusion criteria are fulfilled:
1. History of any clinically significant disease or disorder which, in the opinion of the 
Investigator, may either put the subject at risk because of participation in the study, or 
influence the results or the subject’s ability to participate in the study.
2. History or presence of gastrointestinal (GI), hepatic or renal disease, or any other 
condition known to interfere with absorption, distribution, metabolism, or excretion of 
drugs.
3. Any clinically significant illness, medical/surgical procedure, or trauma within 4 weeks 
of the first administration of IMP.
4. Subject has a positive test result for SARS-CoV-2 RT-PCR before randomisation.
5. Subject has clinical signs and symptoms consistent with COVID-19, eg, fever, dry 
cough, dyspnoea, sore throat, fatigue or confirmed infection by appropriate laboratory 
test within the last 4 weeks prior to screening or on admission.
6. History of severe COVID-19 (hospitalisation, extracorporeal membrane oxygenation, 
mechanically ventilated).
7. Any clinically significant abnormalities in clinical chemistry, haematology, or 
urinalysis results, at Screening (Visit 1) as judged by the Investigator, including:
(1) Alanine aminotransferase (ALT) >1.5 × ULN
(2) Aspartate aminotransferase (AST) >1.5 × ULN
(3) Bilirubin (total) >1.5 × ULN
(4) Gamma glutamyl transpeptidase (GGT) >1.5 × ULN
If any of these tests are out of range, the test can be repeated once at the Screening 
Visit at the discretion of the Investigator.
8. Any clinically significant abnormal findings in vital signs at Screening as judged by 
the Investigator, including:
(1) Systolic blood pressure <90 mmHg or >140 mmHg
(2) Diastolic blood pressure <50 mmHg or >90 mmHg
(3) Heart rate <50 or >90 bpm
If any of these tests are out of range, the test can be repeated once at the Screening 
Visit at the discretion of the Investigator.
9. Carrier of the HLA-B*58:01 allele.
10. Any clinically important abnormalities in rhythm, conduction or morphology of the 
12-lead safety ECG and any clinically important abnormalities in the 12-lead safety 
ECG as considered by the Investigator that may interfere with the interpretation of QT 

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interval corrected for heart rate using Fridericia’s formula (QTcF), including abnormal 
ST-T-wave morphology, particularly in the Clinical Study Protocol (CSP)-defined 
primary lead for dECG analysis or left ventricular hypertrophy:
(1) Prolonged QTcF >450 ms or shortened QTcF <340 ms or family history of long 
QT syndrome.
(2) PR (PQ) interval shortening <120 ms (PR >110 ms but <120 ms is acceptable if 
there is no evidence of ventricular pre-excitation).
(3) PR (PQ) interval prolongation (>220 ms) intermittent second (Wenckebach block 
while asleep is not exclusive) or third degree atrioventricular (AV) block, or AV 
dissociation.
(4) Persistent or intermittent complete bundle branch block, incomplete bundle 
branch block, or intraventricular conduction delay with QRS >110 ms. Subjects 
with QRS >110 ms but <115 ms are acceptable if there is no evidence of 
ventricular hypertrophy or pre-excitation.
11. Any positive result on Screening for serum hepatitis B surface antigen OR anti-HBc 
antibody, hepatitis C antibody, and human immunodeficiency virus (HIV) antibody.
12. Suspected or known Gilbert’s syndrome.
13. Current smokers or those who have smoked or used nicotine products (including 
e-cigarettes) within the 3 months prior to Screening.
14. Known or suspected history of alcohol abuse or excessive intake of alcohol as judged 
by the Investigator. Excessive intake of alcohol defined as the regular consumption of 
more than 24 g of alcohol per day for men or 12 g per day for women.
15. Positive screen for drugs of abuse, cotinine (nicotine) or alcohol at the Screening Visit 
or on each admission to the study centre.
16. Excessive intake of caffeine-containing drinks or food (eg, coffee, tea, chocolate) as 
judged by the Investigator. Excessive intake of caffeine defined as the regular 
consumption of more than 600 mg of caffeine per day (eg, >5 cups of coffee) or would 
likely be unable to refrain from the use of caffeine-containing beverages during 
in-house stay at the study site.
17. Previous hypersensitivity reaction to allopurinol or any URAT1 inhibitor.
18. Subjects who are pregnant, breast-feeding or planning to become pregnant (pregnancy 
is to be avoided for the entire study period and 3 months after the Follow-up Visit).
19. Use of drugs with enzyme-inducing properties such as St John’s Wort within 3 weeks 
prior to the first administration of IMP.
20. Use of any prescribed or non-prescribed medication including antacids, analgesics 
(other than paracetamol/acetaminophen), herbal remedies, megadose vitamins (intake 
of 20 to 600 × the recommended daily dose) and minerals during the 2 weeks prior to 
the first administration of IMP or within 5 half-lives (whichever is longer). Hormone 
replacement therapy is allowed for females.
21. Plasma donation within 1 month of Screening or any blood donation/blood loss 
>500 mL during the 3 months prior to Screening.

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22. Has received another new chemical or biological entity (defined as a compound which 
has not been approved for marketing in the US) within 30 days or within 5 half-lives 
(whichever is longer) of the first administration of IMP in this study.
Note: Subjects consented and screened, but not randomised in this study or a previous 
Phase I study, are not excluded.
23. Involvement of any AstraZeneca, Parexel or study site employee or their close 
relatives.
24. Subjects who have previously received verinurad.
25. Subjects who cannot communicate reliably with the Investigator and/or are not able to 
read, speak and understand the German language.
26. Judgment by the Investigator that the subject should not participate in the study if there 
are any ongoing or recent (ie, during the Screening Period) minor medical complaints 
that may interfere with the interpretation of the study data or are considered unlikely to 
comply with study procedures, restrictions and requirements.
27. Subjects who are vegans or have medical dietary restrictions.
28. Vulnerable subjects, eg, kept in detention, protected adults under guardianship, 
trusteeship, or committed to an institution by governmental or juridical order.
29. Subjects who are regularly exposed to COVID-19 (eg, health care professionals 
working in COVID-19 wards or at emergency departments) as part of their daily life. 
7.2.
Restrictions During the Study
The following restrictions apply for the specified times during the study period:
1
Subjects will be fasted for 10 hours prior to dosing (starting from Day −1).  The IMPs 
will be administered with 240 mL of water.  No food will be allowed for at least 
3 hours post-dose.  Water will be allowed as desired except for 1 hour before and 
after drug administration (see Section 9.6).
2
Subjects should not lie fully supine (unless specified for certain assessments) for 
4 hours after dosing.
3
Subjects should not engage in any strenuous activity from 72 hours prior to check-in 
until after their final Follow-up Visit.
4
Subjects should abstain from alcohol for the duration of the study from the first 
check-in (Day -1 of Treatment Period 1) until after their last PK sampling visit.  
Subjects should also abstain from alcohol for 72 hours before the Screening Visit and 
their Follow-up Visit. 
5
Prior to each treatment period, subjects should abstain from caffeine-containing foods 
and beverages for 24 hours prior to check-in until discharge from the study centre.
6
Subjects should abstain from grapefruit or grapefruit juice, Seville oranges, quinine 
(eg, tonic water) from 7 days prior to check-in on Day -1 until after their Follow-up 
Visit.

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7
During admission periods, subjects will receive a standard diet, which excludes all 
alcohol and grapefruit-containing products.  No additional food or beverages must be 
consumed while in the study centre.
8
Standardised meals, water intake and timing: Subjects will receive standardised 
meals, scheduled at the same time in each study period, to avoid the impact of food 
on the ECG.

On Day 1: (1) a very light snack immediately after 3-hour sample, (2) meal 
immediately after 6-hour sample, and (3) dinner after 10-hour sample.  

On Days 2 and 3, subjects should not eat any food up to 2 hours before the 
36-hour and 48-hour samples.  

The dose will be administered after an overnight fast of at least 10 hours with 
240 mL of water.  Subjects should drink 3 to 3.5 L of water on Day −1 and again 
on Day 1.  To prevent dehydration, subjects will be allowed to drink water until 
1 hour before dosing.  Water will be allowed ad libitum from 1 hour after dosing.
9
During the subjects’ outpatient periods, subjects should abstain from consuming high 
energy drinks (eg, red bull), and food containing poppy seeds and any over-the-
counter medication or herbal preparations until after their Follow-up Visit has been 
completed.  Subjects should also limit their caffeine intake to equivalent of 3 cups of 
coffee per day (1 cup=330 mL soda, 180 mL coffee, or 240 mL tea).  
10 Subjects will be required to abstain from blood or plasma donation until 3 months 
after the final medical examination at the Follow-up Visit.
11 Subjects are advised to adhere to local requirements for reduction of the public 
SARS-CoV-2 exposure while ambulatory.  All subjects are called 1 day prior to 
every visit for assessing COVID-19 symptoms and signs and are asked not to attend 
the site in case of suspected infection.  In addition, subjects are asked for any contact 
with a person who has confirmed infection.  If applicable, subjects will be referred to 
the local health care system.  Physical distancing and person-to-person contact 
restrictions will be applied and explained to subjects while staying at the study site.  
Where physical distancing is not possible, subjects will be asked to use surgical face 
masks and/or gloves if deemed appropriate by the Investigator and site staff and 
guided by local requirements.
For medication restrictions, please refer to Section 9.7.
7.2.1.
Reproductive Restrictions
Verinurad is not genotoxic, has no effect on fertility in animal studies, and carries a low 
risk for foetal harm at maternally nontoxic doses in animal studies.  
A female subject who participates in the clinical trial must either:

Be of non-childbearing potential, that is, she must be surgically sterilized or 
post-menopausal as described in Section 7.2.1.1, OR

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
If of childbearing potential, must be using highly effective methods of birth control as 
described in Section 7.2.1.2.
7.2.1.1.
Women of Non-Childbearing Potential
Women of non-childbearing potential are defined as female subjects who are permanently 
surgically sterilized or post-menopausal.
Acceptable methods of sterilization include:

Surgical bilateral oophorectomy (with or without hysterectomy) at least 6 weeks
before Screening.  In the case of oophorectomy alone, only when the reproductive 
status of the woman has been confirmed by follow-up hormone level assessment. 

Hysterectomy at least 6 weeks before Screening.

Bilateral salpingectomy.
Females are considered post-menopausal if they have had amenorrhea for at least 
12 months or more following cessation of all exogenous hormonal treatments and FSH 
levels are in the post-menopausal range (eg, age appropriate, history of vasomotor 
symptoms) or for women <60 years the FSH levels are >40 mIU/mL.
7.2.1.2.
Women of Childbearing Potential
A woman is considered of childbearing potential, ie, fertile, following menarche and until 
becoming post-menopausal, unless permanently sterile.  Women of childbearing potential
who are sexually active must agree to use, with their partner, an approved method of 
highly effective contraception from the time of IMP administration until 3 months after the 
Follow-up Visit.

A barrier method must be used in combination with one of the following methods, 
considered to be highly effective (failure rate <1% per year when used consistently 
and correctly):

Hormonal contraception, ie, combined oral contraceptives, injectable1 or 
implantable1 hormonal contraceptives,

Hormonal or non-hormonal intrauterine device1 (IUD, loop), established IUD1 or 
intrauterine system (Note: The IUD must have a failure rate <1%),

Surgical sterilization1 (ie, bilateral tubal ligation for females; vasectomy for male 
partners [must have been vasectomized before the female subject entered the 
clinical trial and he is the sole sexual partner of the female subject during the 
clinical trial]).

Barrier methods of contraception include:

Condom (without spermicidal foam/gel/film/cream/suppository or fat- or 
oil-containing lubricants)

Occlusive cap (diaphragm or cervical/vault caps) with spermicidal 
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1 These methods are considered to have low user dependency.
Note: Double-barrier is not considered a highly effective method.
Female subjects must agree not to attempt to become pregnant, must not donate ova and 
must not breastfeed starting at Screening and throughout the clinical study and for 90 days
after receiving the Follow-up Visit.
Women should be informed of the potential risks associated with becoming pregnant while 
enrolled.
Alternatively, true abstinence is acceptable when it is in line with the subject’s preferred 
and usual lifestyle.  Periodic abstinence (eg, calendar, ovulation, symptothermal, post-
ovulation methods), declaration of abstinence for the duration of a trial and withdrawal are 
not acceptable methods of contraception.
Pregnancy Testing
Women of childbearing potential can be included only after a negative highly sensitive 
serum pregnancy test.  Additionally, urine pregnancy testing will be done as per the 
Schedule of Assessments. 
Pregnancy
If the subject becomes pregnant during the study this should be reported to the 
Investigator.  The Investigator should also be notified of pregnancy occurring during the 
study but confirmed after completion of the study.  The pregnancy will be followed and 
the status of mother and child will be reported to the Sponsor after delivery.
A pregnancy notification form and follow-up will be completed.
7.2.1.3.
Male Subjects
Verinurad had no effects on fertility or embryo-foetal development in rats at doses up to 
300 mg/kg/day and did not affect embryo-foetal development in rabbits at doses up to 
30 mg/kg/day.  There is inadequate evidence of safety of allopurinol in human pregnancy, 
although it has been in wide use for many years without apparent ill consequence.
Male subjects participating in this study are not required to apply contraception. However, 
it is recommended that male subjects should not donate sperm until at least 3 months after 
the Follow-up Visit.  In addition, as a precaution, all male subjects should avoid fathering 
a child AND exposing a foetus to verinurad by either true abstinence or use  of a highly 
effective method of contraception (see definition above), together with their female 
partner, starting from the time of IMP administration until at least 3 months after the 
Follow-up Visit.

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Pregnancy
Male subjects will be instructed that, if their partner becomes pregnant during the study, 
this should be reported to the Investigator.  The Investigator should also be notified of 
pregnancy occurring during the study but confirmed after completion of the study.  In the
event that a subject’s partner is subsequently found to be pregnant after the volunteer is 
included in the study, then consent will be sought from the partner and, if granted, any 
pregnancy will be followed and the status of mother and/or child will be reported to the 
Sponsor after delivery.
A pregnancy notification form and follow-up will be completed.
7.3.
Replacement of Subjects
Subjects who are withdrawn from the study due to AEs or changes in safety parameters 
will not be replaced unless a specific sample size is to be met for statistical purposes and if 
the Sponsor’s responsible physician and the Investigator agree it is safe to do so.  Subjects 
who withdraw or are withdrawn from the study for suspected or confirmed COVID-19 
infection or other reasons may be replaced following discussion with the Sponsor.

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8.
STUDY STOPPING RULES
8.1.
Discontinuation of Investigational Medicinal Product and 
Withdrawal from the Study
Subjects must be discontinued from treatment in the following situations:

Subject decision.  The subject is at any time free to discontinue treatment, without 
prejudice to further treatment.

Severe noncompliance to study protocol.

Any significant and clinically relevant changes in the safety parameters (eg, ECG, 
blood pressure, pulse rate, body temperature, laboratory assessments and AE) making 
the continuation of IMP administration unjustified.

Study-specific withdrawal criteria: If a subject reports any event/symptoms that are 
considered unacceptable by the subject or the Investigator, he/she will be withdrawn 
from the study.  In particular:

Any severe or serious AE that is judged as possibly related to the IMP by the 
Investigator.

Any case of Potential Hy’s Law (PHL) according to Appendix C.

QTc prolongation defined as QTcF >500 ms, or a prolongation from baseline of 
>60 ms, confirmed (persistent for at least 5 minutes) and determined post-dose 
either during continuous 12-lead safety ECG monitoring or on a repeat 12-lead 
safety ECG.

See Appendix D for details on the handling of renal-related or urolithiasis 
treatment-emergent AEs, and the handling of serum creatinine elevation, which 
includes criteria for stopping treatment.

Pregnancy.

Any confirmed COVID-19 case that warrants discontinuation in the judgment of 
the Investigator or Sponsor to protect the safety of the subject, other study 
participants or study site staff.
The appropriate AE form in the case report form (CRF) is to be completed.
8.1.1.
Premature Termination of the Study and Stopping Criteria
The study will be put on temporary hold (defined as treatment stopped for enrolled 
subjects and stop enrolment of subjects into the study) pending further safety data analysis 
if any of the following criteria occur in subjects receiving IMP:

A “serious” adverse reaction (ie, an SAE considered at least possibly related to IMP
administration as per guideline EMEA/CHMP/SWP/28367/07 Rev. 1 [22]) in 
1 subject;

“Severe” non-serious adverse reactions (ie, severe non-serious AEs considered as at 
least possibly related to the IMP administration) in 2 subjects in the same treatment 
sequence, independent of within or not within the same System Organ Class (SOC).

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The study will be terminated prematurely if:

The Investigator and the Sponsor assess that the number and/or severity of AEs justify 
discontinuation of the study.  For instance, when there is at least 1 case of fatal SAE or 
2 cases of other SAEs, in both situations considered related to the IMP by the 
Investigator and the Sponsor.

The Sponsor considers the applied doses of the IMPs to be no longer relevant.

The Sponsor decides to discontinue the study.

Data, that were not known before, become available and raise concern about the safety 
of IMP so that continuation would pose potential risks to the subjects.

New data become available regarding COVID-19, which raise concern for the safe 
study conduct so that continuation would pose potential risks to the subjects or the 
study site staff.
Premature termination of the study must be mutually agreed upon by the Investigator and 
the Sponsor and must be documented.  However, study results will be reported according 
to the requirements outlined in this CSP as far as applicable.

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9.
TREATMENTS
9.1.
Identity of the Investigational Medicinal Product
Details on the identity of the test products (verinurad, allopurinol) and reference product
(placebo) are presented in Table 9-1 and Table 9-2.  The capsules of verinurad ER8 12 mg, 
verinurad IR 10 mg and verinurad placebo are all of the same size and shape.
Table 9-1
Identity of the Investigational Medicinal Products - Verinurad 12 mg 
ER8, Verinurad 10 mg IR and Matching Placebo
Verinurad 12 mg ER8
Verinurad 10 mg IR
Placebo
Supplier:
AstraZeneca
AstraZeneca
AstraZeneca
Formulation:
Capsule
Capsule
Capsule
Strength/concentration:
12 mg ER8
10 mg IR
NA
Dose:
24 mg ER8
40 mg IR
NA
Route of administration:
Oral
Oral
Oral
Regimen:
2×12 mg verinurad ER8 
capsule formulation
4×10 mg verinurad IR 
capsule formulation
2× or 4× placebo capsule 
matching verinurad*
Special handling 
requirements:
None
None
None
ER8: Extended-release; IR: Immediate-release; NA: Not applicable.
* Subjects receiving Treatment A will receive 2 placebo capsules matching verinurad; subjects receiving 
Treatment C will receive 4 placebo capsules matching verinurad. 
Table 9-2
Identity of the Investigational Medicinal Products - Allopurinol and
Matching Placebo
Allopurinol 
Placebo
Supplier:
AstraZeneca
AstraZeneca
Formulation:
Tablet
Tablet
Strength/concentration:
300 mg
NA
Dose:
300 mg
NA
Route of administration:
Oral
Oral
Regimen:
1× 300 mg allopurinol tablet 
formulation
1× placebo tablet matching 
allopurinol 300 mg
Special handling requirements:
None
None
NA: Not applicable.
Details of the batch numbers will be included in the Trial Master File and the final CSR.
9.2.
Supply of Investigational Medicinal Product
Verinurad, allopurinol and the matching placebos will be supplied by AstraZeneca and 
provided in study-specific labeled bottles. 

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A technical agreement between the Investigator and AstraZeneca will be in place to cover 
all pharmacy related activities, detailing roles and responsibilities prior to receipt of the 
IMPs at the study centre.
A release document signed by a legally authorized Qualified Person at the study centre
will be placed in the appropriate section of the Trial Master File to document labeling and 
dispensing of the IMPs to the subject.
9.3.
Storage and Handling Procedures
All study treatment will be stored in a secure facility, details of storage conditions will be 
provided on the respective labels of the IMP.
AstraZeneca will be permitted upon request to audit the supplies, storage, dispensing 
procedures and records provided that the blind of the study is not compromised.
9.4.
Labeling
Labels will be prepared in accordance with Good Manufacturing Practice (GMP) and local 
regulatory guidelines.
The labels will fulfill GMP Annex 13 requirements and medical device directive for 
labeling.
9.5.
Drug Accountability, Dispensing and Destruction
The IMP provided for this clinical study will be used only as directed in this CSP.
In accordance with GCP, the study centre will account for all supplies of verinurad, 
allopurinol, and placebo.  Details of receipt and storage, dispensing and return will be 
recorded.
All unused supplies of verinurad, allopurinol, and placebo will either be destroyed by 
Parexel or returned at the end of the study in accordance with instruction by the Sponsor.
9.6.
Dose and Treatment Regimens
In the respective treatment periods, subjects will receive single doses of verinurad, 
allopurinol, and placebo under fasted conditions. In order to blind the treatments, each 
subject will receive 4 verinurad capsules and 1 allopurinol tablet at each dispensation. The 
capsules of verinurad 12 mg ER8, verinurad 10 mg IR and verinurad placebo are all of the 
same size and shape.  In total, 5 capsules/tablets will be administered per dispensing visit 
according to the scheme in Table 9-3.

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Table 9-3
Treatment Regimens
IMP
Number of Capsules/Tablets Administered
Treatment Aa
Treatment Bb
Treatment Cc
12 mg verinurad ER8 capsule
2
0
0
10 mg verinurad IR capsule 
0
4
0
Verinurad placebo
2
0
4
300 mg allopurinol tablet 
1
1
0
Allopurinol placebo
0
0
1
Total number of tablets/capsules
5
5
5
ER8: Extended-release; IMP: Investigational Medicinal Product; IR: Immediate-release.
a
Treatment A: Verinurad 24 mg ER8 formulation co-administered with 300 mg allopurinol
b
Treatment B: Verinurad 40 mg IR formulation co-administered with 300 mg allopurinol
c
Treatment C: Matched placebos for both verinurad and allopurinol
Requirements for hydration are described in Section 7.2. 
After dosing, subjects will remain semi-supine on their bed or sitting (except when 
necessary for study procedures) until completion of the 3-hour assessments.  
Other restrictions, including posture control are described in Section 7.2.  Data of subjects 
may be excluded from the PK Analysis Set as described in Section 12.3.4.
9.7.
Concomitant and Post-study Treatment(s)
Apart from paracetamol/acetaminophen, hormone replacement therapy, and systemic 
contraceptives, no concomitant medication or therapy will be allowed.
The subjects should be instructed that no other medication is allowed, including herbal 
remedies, vitamin supplements and over-the-counter products, without the consent of the 
Investigator.
Medication, which is considered necessary for the subject’s safety and well-being, may be 
given at the discretion of the Investigator during the residential period.
When any medication is required, it should be prescribed by the Investigator.  Following 
consultation with AstraZeneca Lead Physician, the Investigator should determine whether 
or not the subject should continue in the study.  Administration of concomitant 
medications that may influence the measurement of the PK and/or PD endpoints must be 
documented as a protocol deviation after consultation of the Investigator with AstraZeneca 
Lead Physician
9.8.
Treatment Compliance
Dosing will take place at the study centre (Parexel Early Phase Clinical Unit).
The administration of all IMPs will be recorded in ClinBase™.

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Compliance will be assured by direct supervision and witnessing of IMP administration.  
After IMP administration, a check of the subject’s mouth and hands will be performed.
In addition, bioanalysis of the time at predicted Cmax plasma sample from all presumed 
placebo-treated subjects may be used to confirm lack of verinurad, M1, M8, allopurinol or 
oxypurinol in the plasma.
9.9.
Randomisation
9.9.1.
Subject Enrolment and Randomisation
The Investigator will ensure that:

Signed informed consent is obtained from each potential subject before any 
study-specific procedures are performed.

Each potential subject is assigned a unique enrolment number at Screening upon 
signing the informed consent.

The eligibility of each subject is in accordance with the inclusion and exclusion 
criteria.

Each eligible subject is assigned a unique randomisation code.
Randomisation to the cross-over treatment sequence will be done on the evening prior to 
the day of first dose (Treatment Period 1).
Randomisation codes will be assigned strictly sequentially as subjects become eligible for 
randomisation (codes to be used without leading zero(s)).
When using unique enrolment number, the specific format must be followed (ie, reduced 
enrolment number “01001” in ClinBase™and on labels, full enrolment number 
“E0001001” for outputs).
If a subject withdraws his/her participation in the study, then his/her 
enrolment/randomisation code cannot be reused.  If a replacement is mandated,
replacement subjects will receive a new randomisation number and will be allocated to the 
same treatment sequence as the replaced subject.
9.9.2.
Procedures for Randomisation
Upon completion of the randomisation requirements specifications form, randomisation 
will be produced by Parexel according to the AstraZeneca randomisation system 
(AZRand).
Subjects will be randomised according to a randomised William’s Latin square to receive 
the 3 study treatments (Treatment A: verinurad 24 mg ER8 + allopurinol; Treatment 
B: verinurad 40 mg IR + allopurinol, Treatment C: placebo) in 1 of 6 treatment sequences:
ABC, BCA, CAB, ACB, BAC, or CBA.
The randomisation will be completed using consecutive randomisation codes.

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The number of subject identifiers generated for the study will account for the number of 
randomised subjects per the sample size calculation (N=24; see Section 12.4) as well as 
providing sufficient randomisation numbers for replacements.  For this study, a total of 
48 subject identifiers will be randomly assigned to the treatment sequences (ABC, BCA, 
CAB, ACB, BAC, CBA).
9.9.3.
Procedures for Handling Incorrectly Randomised Subjects
Subjects who fail to meet the inclusion criteria or meet any exclusion criterion should not, 
under any circumstances, be randomised into the study.  There can be no exceptions to this 
rule.
Where a subject who does not meet the selection criteria is randomised in error and this is 
identified before dosing, the subject should be withdrawn from the study.  If a subject is 
withdrawn prior to dosing they will be replaced.
If a subject who does not meet the selection criteria has been dosed before the error is 
identified, the subject should be withdrawn and advised to continue safety assessments to 
ensure their safety.  The Investigator will inform the AstraZeneca Lead Physician of the 
error and a joint decision made as to whether the subject should be replaced.
9.10.
Blinding
9.11.
Methods for Ensuring Blinding
This study is double-blind with regard to IMP (verinurad and allopurinol or the matching 
placebos).
Placebos will be matched with their respective test product (verinurad or allopurinol) for 
formulation, appearance, and amount.  
Any clinical staff involved in the preparation or administration of the IMP and who 
become unblinded will take no further part in the study.
The randomisation list should be kept in a secure location until the database is locked or 
equivalently, a clean file is declared.
The pharmacokineticist will remain blinded during the study conduct, unless otherwise 
required, based on study findings.
The pharmacokineticist will be unblinded to perform the final PK analyses after all 
subjects have completed the study, final bioanalytical results are available and all required 
study data are considered clean.  This may occur prior to database lock.
The following personnel will have access to the randomisation list:

The AstraZeneca personnel carrying out the labeling and packaging of subject-specific 
treatments

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
The pharmacy personnel preparing IMP at the site

The personnel performing the bioanalyses of the plasma/urine samples.
9.12.
Methods for Unblinding the Study
As the study will be conducted double-blinded, individual treatment codes, indicating the 
treatment randomisation for each randomised subject, will be available to the Investigator
and the pharmacist.
In most of the studies using blinding, the treatment code should not be broken except in 
medical emergencies when the appropriate management of the subject requires knowledge 
of the treatment randomisation.  The Investigator documents and reports the action to 
AstraZeneca, without revealing the treatment given to the subject to the AstraZeneca staff.  
In the event of a medical emergency when management of a subject’s condition requires 
knowledge of the study medication, the treatment received may be revealed by personnel 
authorized by the Investigator.  If possible, such emergencies are to be discussed with 
AstraZeneca prior to disclosure of the treatment allocation.  Reasons for breaking a code 
will be clearly explained and justified in the subject’s CRF.  The date on which the code 
was broken together with the identity of the person responsible will also be documented.

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10.
MEASUREMENTS AND METHODS OF ASSESSMENTS
10.1.
Appropriateness of Measurements
Standard measures to assess PK, safety and tolerability apply during the study.  For the 
single doses of verinurad and allopurinol planned to be given during this study, no safety 
issues are expected.
For timing of assessments refer to Table 5-2.
10.2.
Enrolment and Screening Procedures
Viral serology and urine tests for drugs of abuse, alcohol and cotinine will be done to 
assess eligibility.  Laboratory tests for FSH (females only) and pregnancy (females only)
will be done. The use of concomitant medication will be recorded and reported.
10.3.
Pharmacokinetics
10.3.1.
Collection of Pharmacokinetic Samples
Blood samples for the determination of plasma concentrations of verinurad, verinurad 
metabolites (M1 and M8), allopurinol, and allopurinol metabolite (oxypurinol) will be 
collected for each treatment period as specified in the Schedule of Assessments (Table
5-2).
Samples will be collected, handled, labeled, stored and shipped as detailed in the 
Laboratory Manual.
10.3.2.
Pharmacokinetic Drug Assays
Blood samples for determination of verinurad, M1, M8, allopurinol, and oxypurinol 
concentrations in plasma will be analysed by Covance Bioanalytical Services on behalf of 
AstraZeneca, using validated assays.  Additional analyses may be conducted on the 
biological samples to further investigate the presence and/or identity of drug metabolites.
Placebo samples will not be analysed, unless there is a need to confirm that correct 
treatment has been given to study subjects.
Full details of the analytical methods and analyses performed will be described in a 
separate Bioanalytical Report.
10.4.
Safety Measurements
Safety and tolerability variables will include:

Adverse events

Laboratory variables (haematology, clinical chemistry and urinalysis), tested locally

Vital sign variables (systolic and diastolic blood pressure, pulse rate, body 
temperature)

ECG parameters

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
Telemetry findings

Physical examination findings 
10.4.1.
Adverse Events
Refer to Section 13.
10.4.2.
Laboratory Assessments
10.4.2.1.
Haematology
Haematology
WBC count
Neutrophils absolute count 
RBC count
Lymphocytes absolute count 
Hb
Monocytes absolute count 
HCT
Eosinophils absolute count 
MCV
Basophils absolute count 
MCH
Platelets
MCHC
Reticulocytes absolute count 
Hb: Haemoglobin; HCT: Haematocrit; MCH: Mean corpuscular haemoglobin; MCHC: Mean corpuscular 
haemoglobin concentration; MCV: Mean corpuscular volume; RBC: Red blood cell; WBC: White blood cell.
10.4.2.2.
Serum Clinical Chemistry
Serum Clinical Chemistry 
Sodium
ALP
Potassium
ALT
Urea
AST
Creatinine
GGT
Albumin
Total Bilirubin
Calcium
Unconjugated bilirubin
Phosphate
sUA
Glucose (fasting)
CRP
TSHa
FSHb
ALP: Alkaline phosphatase; ALT: Alanine aminotransferase; AST: Aspartate aminotransferase; 
CRP: C-reactive protein; FSH: Follicle-stimulating hormone; GGT: Gamma glutamyl transpeptidase;
sUA: Serum uric acid; TSH: Thyroid-stimulating hormone.
a
Screening only
b
Females only
10.4.2.3.
Genotyping
Genotyping
HLA-B
HLA-B: Human leukocyte antigen B

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10.4.2.4.
Urinalysis
Urinalysisa
Glucose
pH
Protein
Blood
a
Upon a positive urine test from leucocytes, blood, nitrite or protein, the Investigator may require further 
urine analysis, such as flow cytometry.  Results of additional urine analyses will be included in the 
database.  If the flow cytometry examination shows a different result than the urine sticks, the urine will 
be investigated by fully automated digital imaging where leukocytes, erythrocytes, casts in urine will be 
analysed.
10.4.2.5.
Pregnancy Testing
Pregnancy test (females only)
β-hCG
β-hCG: Beta human chorionic gonadotropin.
10.4.2.6.
Viral Serology
Viral Serology
HIV I and II
SARS-CoV-2 antibody
HBsAg
HCV antibody
Anti-HBc antibody
HBc: Hepatitis B core; HBsAg: Hepatitis B surface antigen; HCV: Hepatitis C virus; HIV: Human 
immunodeficiency virus; SARS-CoV-2: Severe acute respiratory syndrome coronavirus 2.
10.4.2.7.
SARS-CoV-2 Virology
SARS-CoV-2 Virology
SARS-CoV-2 RT-PCR
RT-PCR: Reverse transcriptase polymerase chain reaction; SARS-CoV-2: Severe acute respiratory syndrome 
coronavirus 2.
10.4.2.8.
Drugs of Abuse and Alcohol 
Drugs of Abuse and Alcohol
Amphetamine / Ecstasy
Benzodiazepines
Ethanol
Methadone Metabolites
Cannabinoids
Barbiturates
Cocaine
Phencyclidine
Opiates 
Urine Creatinine
Cotinine
TCA
TCA: Tricyclic anti-depressants

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10.4.3.
Vital Signs
The following variables will be collected after the subject has rested in the supine position 
for at least 10 minutes:

Systolic blood pressure (mmHg)

Diastolic blood pressure (mmHg)

Pulse (bpm)

Tympanic body temperature (°C)
Supine pulse (bpm) and blood pressure (mmHg) will be measured at the time points 
indicated in Table 5-2.  Measurements will be performed according to Parexel standard 
operating procedures (SOP), subsequent to at least a 10-minute rest.  Systolic and diastolic 
blood pressure will be measured using the same cuff size, appropriate for arm 
circumference, in triplicates and then averaged, throughout the study.  Body temperature 
will be measured at least once daily (in the morning) at every visit or during in-house stay.
10.4.4.
Electrocardiography
10.4.4.1.
12-lead Safety Electrocardiogram
At the time points specified in Table 5-2, a 10-second 12-lead safety ECG for safety 
review by the Investigator will be obtained after 10 minutes supine rest.  These 12-lead 
safety ECG recordings will be performed prior to the dECG recordings and at additional 
intervals if required. 
When 12-lead safety ECG time points coincide with dECG or telemetry time points, the 
12-lead safety ECG will be printed out directly from the device used for dECG or 
telemetry.  When 12-lead safety ECG time points do not coincide with dECG or telemetry 
time points, the 12-lead safety ECGs will be obtained using the study centre’s own ECG 
device.
The Investigator will judge the overall interpretation as normal or abnormal. If abnormal, 
it will be decided whether or not the abnormality is clinically significant and the reason for 
the abnormality will be recorded. Throughout the study, clinically relevant new findings 
or worsening of a pre-existing finding in the ECGs (parameters or abnormal findings in the 
tracing) must be considered an AE and must be recorded. 
The date/time and the physician interpretation (normal, abnormal clinically significant, 
abnormal not clinically significant) for the 12-lead safety ECGs will be recorded in the 
source, with any abnormalities specified.  The outcome of the overall evaluation is to be 
recorded as normal/abnormal in the electronic source, with any abnormalities specified.
The Investigator may add extra 12-lead safety ECG assessments if there are any abnormal 
findings or if the Investigator considers it is required for any other safety reason.  These 
assessments should be entered as an unscheduled assessment.

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All ECG readings will be digitally stored as source documents.
10.4.4.2.
Electronic Capture of 12-lead Continuous Digital Electrocardiogram
The AstraZeneca ECG Centre will perform the dECG analysis in this study, using the 
EClysis© system, version 4.0, or higher.
At the time points specified in Table 5-3, 12-lead continuous dECG files will be recorded 
using the site’s Mortara Telemetry Surveyor equipment according to AstraZeneca ECG 
Centre´s standard procedures for settings, recording and transfer of dECGs.
The same recording device will be used for each subject at all time points, when possible.  
Date and time settings must be checked on the Mortara Telemetry Surveyor at the start of 
each study day and aligned with an official timekeeper.
The metadata of each file will be checked by the responsible personnel at the study site to 
ensure that the files transferred to the AstraZeneca central dECG files repository are 
correct. 
Skin preparation must be thorough and electrode positions must be according to standard 
12-lead safety ECG placement.  Electrode positions will be marked with an indelible pen 
at the start of each study day to ensure exact reposition.  Permanent electrodes will be 
applied at least 30 minutes before first study recording and left in place for the duration of 
each relevant study day.
Subjects will rest in a supine position for at least 10 minutes before the start of each 
recording.  The subject should be in the same supine body position (maximum 30 degrees 
flexion of the hip and feet not in contact with the footboard) at each recording time point 
during the study.
From the continuous dECG files received at the AstraZeneca ECG Centre, the EClysis©
system will extract continuous files of at least 5 minutes length at the time points indicated 
in Table 5-3. The extraction window can be adjusted based on the clinical logs received 
from the site. As standard, from each dECG extracted window, 10-second ECGs will be 
extracted by the EClysis© system twice per minute and will be initially automatically 
analysed by the software. 
The dedicated ECG Scientific Advisor(s) with Importer role in the EClysis© system will 
evaluate the files for signal quality and provide timely feedback to the study centre. They 
will ensure that all recorded protocol-defined dECGs have been extracted and imported 
and then will make these available to the dedicated ECG Scientific Advisors with the 
Analyst role. 
The ECG Scientific Advisor(s) with Analyst role, as well as the Reviewing Cardiologist, 
will perform the semi-automated analysis in a fully blinded manner (to treatment, time, 
sequence and subject identifier). All dECGs from one subject will be analysed by a single 
reader. 

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Lead V2 will be used as the primary lead, with lead V5 as the primary backup lead and 
lead II as the secondary backup lead, for all time points when lead V2 is found to be 
unsuitable for analysis or evaluation. 
The ECG Scientific Advisor will perform all necessary manual corrections to the ECG 
annotations provided automatically by EClysis©. 
Finally, the Reviewing Cardiologist will review the data and perform all necessary 
adjustments before locking the data into a read-only state. From the locked data, the 
numerical values for the ECG intervals and amplitudes will then be made accessible on a 
secure file share of the AstraZeneca dECG central repository to accredited data 
management specialists for conversion into SAS files®. 
The following dECG variables will be reported by the AstraZeneca ECG Centre: RR, PR, 
QRS and QT intervals from the lead defined as primary analyses lead, as well as potential 
T-wave morphology changes.  For T-wave morphology, treatment-emergent changes will 
be assessed, ie, changes not present at baseline, and will be reported as part of the ECG 
analysis results text in the CSR.  Derived parameters (QTcF, HR and others, as applicable) 
are calculated by the study statistician or delegate.
10.4.5.
Telemetry
A 12-lead real-time cardiac telemetry will be performed for 4 to 6 hours on Day -1 and 
from at least 30 minutes pre-dose until 24 hours post-dose on Day 1 using the Mortara 
Surveyor Telemetry 12-leads system.
The telemetry monitoring system will be reviewed by the Investigator or research nurse 
and paper printouts of any clinically important events will be stored as source data.
10.4.6.
Physical Examination
At the time points specified in the Schedule of Assessments (Table 5-2), a full or brief 
physical examinations will be performed.
Full: The complete physical examinations will include an assessment of the general 
appearance, respiratory, cardiovascular, abdomen, skin, head, and neck (including ears, 
eyes, nose, and throat), lymph nodes, thyroid, musculoskeletal and neurological systems.
Brief: The brief physical examinations will include an assessment of the general 
appearance, skin, abdomen, cardiovascular system and respiratory. 
10.5.
Exploratory Assessments – Not Applicable

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10.6.
Procedures for Handling of Biological Samples
10.6.1.
Storage and Destruction of Biological Samples
Samples will be disposed of, on instruction from AstraZeneca, after the CSR has been 
finalized, unless samples are retained for additional or future analyses.
10.6.1.1.
Pharmacokinetic Samples
Pharmacokinetic samples will be disposed of after the Bioanalytical Report finalization or 
6 months after issuance of the draft Bioanalytical Report (whichever is earlier), unless 
requested for future analyses.
Pharmacokinetic samples may be disposed of or anonymized by pooling.  Additional 
analyses may be conducted on the anonymized, pooled PK samples to further evaluate and 
validate the analytical method.  Any results from such analyses may be reported separately 
from the CSR.
Incurred sample reproducibility analysis, if any, will be performed alongside the 
bioanalysis of the test samples.  The results from the evaluation will not be reported in the 
CSR but separately in a Bioanalytical Report.
10.6.1.2.
Pharmacodynamic Samples – Not Applicable
10.6.1.3.
Pharmacogenetic Samples – Not Applicable
10.6.2.
Labeling and Shipment of Biohazard Samples
Samples will be labeled and shipped in accordance with the Laboratory Manual and the 
Biological Substance, Category B regulations (materials containing or suspected to contain 
infectious substances that do not meet Category A criteria), see Appendix B, ‘IATA 6.2 
Guidance Document’.
Any samples identified as Infectious Category A materials will not be shipped and no 
further samples will be taken from the subject unless agreed with AstraZeneca and 
appropriate labeling, shipment and containment provisions are approved.
10.6.3.
Chain of Custody of Biological Samples
A full chain of custody will be maintained for all samples throughout their lifecycle.
The Investigator will ensure full traceability of collected biological samples from the 
subjects while in storage at the study centre until shipment and will keep documentation of 
receipt of arrival.
The sample receiver will keep full traceability of samples while in storage and during use, 
until used, disposed of, or until further shipment or disposal (where appropriate) and will 
keep documentation of receipt of arrival.

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Samples retained for further use will be registered in the AstraZeneca biobank system 
during the entire life cycle.
10.6.4.
Withdrawal of Informed Consent for Donated Biological Samples
If a subject withdraws consent to the use of donated biological samples, the samples will 
be disposed if not already analysed and the action documented.
As collection of donated biological samples is an integral part of the study, the subject is 
then withdrawn from further study participation.  If the subject withdraws consent for the 
genetic component of the study, then they may continue in the study.
AstraZeneca ensures the central laboratory(ies) holding the samples is/are informed about 
the withdrawn consent immediately and that samples are disposed of/destroyed, the action 
documented, and the signed document returned to the study centre.

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11.
DATA QUALITY ASSURANCE AND DATA 
MANAGEMENT
11.1.
Quality Control and Source Data Verification
Source data verification will be conducted with due regard to subject confidentiality.
The study centre will allow the study monitor and Sponsor representative direct access to 
all study documents, medical files and source documents to enable verification of the study 
data, while maintaining the anonymity of the subject and confidentiality of the data.
Internal quality control will be performed at all stages of the study by the study centre.
11.2.
Audit/Inspections
The study centre facilities and all study data/documentation may be audited/inspected by 
independent auditor/inspector/any representatives of regulatory authorities.  The 
Investigator must allow the applicable persons access to all relevant facilities and 
data/documents. The Investigator must be available to discuss any findings/issues.
If an audit was performed, the audit certificate will be included in the CSR.
11.3.
Study Monitoring
The conduct of the study will be monitored by an independent Parexel monitor or a 
subcontracted monitor to ensure compliance with applicable regulatory requirements and 
GCP.  The summary of the documentation of the monitoring visits will form part of the 
study documentation and will be archived as such.
Monitoring visits at site will be limited to a minimum, required as deemed appropriate 
during COVID-19 pandemic.
11.4.
Data Collection
The ClinBase™ system is an electronic source data capturing and information 
management system.  The system combines all aspects of source data capturing with 
process control and clinical study management.  All clinical and laboratory data, except 
those which are paper-based or provided by external vendor, will be collected in 
ClinBase™.  Only paper-based data will be subject to data entry.  For electronic source 
data, no data entry will be performed.
The responsible study monitor will check data at the monitoring visits to the study centre.  
The Investigator will ensure that the data collected are accurate, complete and legible.  
Data will be monitored within ClinBase™ by the study monitor before being exported.  
Any changes made during monitoring will be documented with a full audit trail within 
ClinBase™.

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11.4.1.
Case Report Forms and Source Documents
All data obtained using paper collection methods during the clinical study will be recorded 
in ClinBase™.  All source documents from which ClinBase™ entries are derived should 
be placed in the subject’s personal records.
The original ClinBase™ entries for each subject will be checked against source documents 
by the study monitor.  Instances of missing or uninterpretable data will be discussed with 
the Investigator for resolution.
11.4.2.
Access to Source Documents
During the course of the clinical study, a study monitor will make study centre visits to 
review protocol compliance, compare ClinBase™ entries and individual subject’s personal 
records, assess IMP accountability and ensure that the clinical study is being conducted 
according to pertinent regulatory requirements.  ClinBase™ entries will be verified against 
source documents.  The review of medical records will be handled confidentially to ensure 
subject anonymity.
Checking of the ClinBase™ entries for completeness and clarity and verifying with source 
documents, will be required to monitor the clinical study for compliance with GCP and 
other regulations.  Moreover, regulatory authorities of certain countries, IECs/Institutional 
Review Boards (IRB)s may wish to carry out source data inspections on-site, and the 
Sponsor’s clinical quality assurance group may wish to carry out audits.  Direct access to 
source data will be required for these inspections and audits; they will be carried out giving 
due consideration to data protection and subject confidentiality.  The Investigator assures 
the Sponsor of the necessary support at all times.
11.5.
Data Management
Parexel will utilize standardised and validated procedures and systems to collect, process 
and file the clinical data of this study.  Any system used will be compliant with FDA 21 
Code of Federal Regulations Part 11 requirements.
A data management plan (DMP) will be prepared to describe the processes and data-flow 
within the clinical study.  Timelines, versions for the computer systems and the coding will 
be defined in the DMP, and if applicable, Sponsor-specific requests will also be 
documented within.  The DMP will be finalized before first dose where possible but before 
database lock.
A data validation specification (DVS) will be created to outline the validation checks to be 
performed during the study.  The DVS must be finalized before data validation.
After the data has been monitored by the responsible study monitor all data received will 
be reviewed, logged and filed.
The raw data intended for further processing will be checked by standard routines or 
according to the DVS and queries will be generated and sent to the Investigator for review 

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and resolution.  Corrections resulting from these queries will be confirmed on the data 
clarification forms (DCFs).  This process will be repeated until no further discrepancies are 
found.  The data will then be declared as clean.  Applicable documentation will be stored 
in the study files.
Only trained study staff will have access to the clinical database and every change in data 
will have a full audit trail.

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12.
STATISTICAL METHODS
12.1.
Overview
The statistical methodology below describes the statistical analysis as it is foreseen when 
the study is being planned.
If circumstances should arise during the study rendering the analysis inappropriate, or if in 
the meantime improved methods of analysis should come to light, different analyses may 
be performed.  A separate concentration-QT (C-QT) analysis plan for the primary C-QT 
analysis will be written for the study.  A brief description of the primary analysis is 
provided in Section 12.9.  All other analyses are described within this protocol.  Any 
deviations from the statistical methodology defined in this protocol, reasons for such 
deviations and all alternative/additional statistical analyses that may be performed will be 
described in the CSR.  Such changes to analyses may be written into an abbreviated 
statistical analysis plan, if appropriate.  The verification and review of all statistical 
modeling assumptions will be documented appropriately.
12.2.
General Statistical Methodology
All original and derived parameters as well as demographic and disposition data will be 
listed and described using summary statistics.  All safety data (scheduled and unscheduled) 
will be presented in the data listings.
Demographic and baseline data will be summarised for all randomised subjects.  
Pharmacokinetic data will be summarised by treatment.  Safety and tolerability data (see 
Section 10.4 for definition of safety and tolerability variables) will be summarised by 
treatment, if applicable.
Frequency counts (number of subjects [n] and percentages) will be made for each 
qualitative variable.  Descriptive statistics (n, mean, standard deviation [SD], median, 
minimum and maximum) will be calculated for each quantitative variable (unless 
otherwise stated).  Descriptive statistics will only be presented if n ≥3.
The following rules will apply to any repeated safety assessments occurring within each 
treatment period:

If the repeated measurement of a specific parameter occurs prior to IMP 
administration (Day 1), then the last obtained value prior to dosing will be used in the 
descriptive statistics and in the calculation of changes from baseline;

If the repeated measurement of a specific parameter occurs after IMP administration 
(Day 1), then the first (non-missing) value after dosing will be used in descriptive 
statistics and in the calculation of changes from baseline.
The planned sequence for measurement of multiple assessments at the same time point is 
described in Section 5.3.5.

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For safety assessments performed at Screening and the Follow-up Visit, the following 
rules will apply for any repeated assessments:

If the repeated assessment occurs at Screening the last available value will be used in 
the summary statistics;

If the repeated assessment occurs at the Follow-up Visit the first non-missing 
assessment will be used in the summary statistics.
All statistical analyses and production of tables, figures and listings will be performed 
using SAS® version 9.4 or later.
12.2.1.
Missing Data
Missing dates and times in the AE data will be handled as described in Section 12.12.2.  
Concentrations that are not quantifiable (NQ) in the PK data will be handled as described 
in Section 12.10.2.
There will be no imputations of other missing data.  All subjects will be included into the 
safety analyses as far as the data permit.
12.3.
Study Populations
12.3.1.
Randomised Set
The Randomised Set will consist of all subjects randomised into the study.
12.3.2.
Safety Analysis Set
The Safety Analysis Set will include all subjects who received at least 1 dose of IMP 
(verinurad, allopurinol and placebo) and for whom any safety post-dose data are available.
Unless otherwise stated, the Safety Analysis Set will be used for the presentation of all 
demographic and disposition data, as well as all safety analyses.  Exposure to IMP will 
also be presented using the Safety Analysis Set.
12.3.3.
Pharmacodynamic Analysis Set
The PD Analysis Set will consist of all subjects in the Safety Analysis Set for whom 
baseline and post-baseline QTcF results from smoothed dECG data are available for at 
least 2 treatment periods (where 1 of the treatment periods needs to be the period in which 
the subject received placebo) and who have no major protocol deviations thought to impact 
on the analysis of the dECG data.
12.3.4.
Pharmacokinetic Analysis Set
The PK Analysis Set will consist of all subjects in the Safety Analysis Set for whom at 
least 1 reportable PK parameter can be calculated and who have no major protocol 
deviations thought to impact on the analysis of the PK data.

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Pharmacokinetic data for a subject during any Treatment Period may be excluded from 
descriptive statistics as a result of the following:

An AE of vomiting that occurred at or before median tmax for that specific treatment

The pre-dose concentration being >5% of Cmax for an analyte in a specific treatment 
period
A subject may be excluded from the analysis only for the specific Treatment Period in 
which the above occurred.  If there are no other reportable PK data for the subject, then the 
subject may be excluded from the PK Analysis Set.
Individual PK concentration data may be excluded from the PK analysis and/or statistical 
analyses and corresponding figures. 
The pharmacokineticist will document and include the reason(s) for exclusion of the 
following:

Exclusion of any subjects from the PK Analysis Set.

Exclusion of any individual concentration-time points from the calculation of the PK 
parameters or from the statistical analyses and corresponding figures.

Exclusion of any individual PK parameters from the statistical analyses and 
corresponding figures.
All available concentration data and PK parameter data will be listed for the Safety 
Analysis Set.  Concentration or parameter data for subjects excluded from the descriptive 
statistics or analysis will be presented in the individual concentration versus time plots or 
PK parameter figures, but not in the corresponding summary figures.
12.4.
Determination of Sample Size
Study sample size for a concentration-QTcF (C-QTcF)-based interval analysis is based on 
the recommendation from Garnett et al 2018 [21] to have 16 to 32 subjects on drug and 8 
to 16 subjects on placebo. The type-1 error rate has been shown to be controlled at around 
5% when the true effect is 10 ms in small-sized studies of 6 to 12 subjects with multiple 
measurements per subject.
A 3-period cross-over study, using C-QTcF-based interval analysis, with 2 verinurad doses 
and placebo in 20 evaluable healthy volunteers is expected to exceed the recommendations 
proposed in Garnett et al 2018 [21].
Twenty-four subjects will be randomised to a 6-sequence William’s design for 3 periods 
and 3 treatments to achieve 20 evaluable subjects based on an expected dropout of 17%.
Evaluable subjects are defined as subjects for whom baseline and post-baseline QTcF 
results from smoothed dECG data are available for at least 2 treatment periods (where 1 of 

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the treatment periods needs to be the period in which the subject received placebo), and 
who have no major protocol deviation thought to impact on the analysis of the dECG data.  
12.5.
Protocol Deviations
Protocol deviations are considered any deviation from the CSP relating to a subject, and 
include the following:

Inclusion/exclusion criteria deviations

Dosing deviations (eg, incorrect treatment received, subject was not fasted as per the 
protocol requirements prior to and after dosing)

Time window deviations for safety and/or PK assessments

Subjects receiving prohibited concomitant medications

Other procedural and study conduct deviations recorded by the study centre on a 
protocol deviation log
The criteria for the assessment and reporting of protocol deviations will be stipulated in a 
separate study-specific protocol deviation specification (PDS) document.  This will include 
a WAD which stipulates tolerance windows for safety and PK assessments.  Measurements 
performed within these tolerance windows will not be considered as protocol deviations 
and will not be reported.
All protocol deviations will be discussed at the data review meeting prior to database hard 
lock in order to define the analysis sets for the study.
Important protocol deviations will be listed by subject.
Protocol deviations (missing assessments/visits) related to COVID-19 will be listed 
separately.
Protocol deviations will be handled in accordance with Parexel SOPs.
For handling of protocol amendments, see Section 3.6.
12.6.
Subject Disposition
A randomisation listing will be presented and include the following: each subject’s 
randomisation number, the subject’s full enrolment number, the treatment to which the 
subject has been randomised and the country where the study centre is located.
Subjects and/or data excluded from the PK and PD analysis sets will be listed including the 
reason for exclusion.  Subject disposition will be summarised and will include the 
following information: number of subjects randomised and dosed, number and percentage 
of subjects completing the study and the number and percentage of subjects who were 
withdrawn (including reasons for withdrawal).  Disposition data will be presented based on 
all subjects randomised.

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Subject discontinuations will be listed including the date of study exit, duration of 
treatment and reason for discontinuation.  A listing of informed consent response will also 
be presented.
12.7.
Demographic and Baseline Data
Demographic variables (age, gender, race, ethnicity, height, weight and BMI) will be listed 
by subject.  Demographic characteristics (age, gender, race and ethnicity) and subject 
characteristics (height, weight and BMI) will be summarised separately for all randomised 
subjects.  The denominator for percentages will be the number of randomised subjects.
Medical history data will be listed by subject including visit, description of the 
disease/procedure, Medical Dictionary for Regulatory Activities (MedDRA) SOC, 
MedDRA Preferred Term, start date and stop date (or ongoing if applicable).
12.8.
Prior and Concomitant Medication and Drug Administration
12.8.1.
Prior and Concomitant Medication
Prior medications are those that started and stopped prior to the first dose of IMP; all 
medications taken after first dosing are considered as concomitant (including medications 
that started prior to dosing and continued after).  Prior medication started within 3 months 
prior to the first dose of IMP will be recorded also in the concomitant medication module 
of ClinBase™. 
Prior and concomitant medication will be listed by subject and will include the following 
information: reported name, preferred term (PT), the route of administration, dose, 
frequency, start date/time, duration and indication. Prior and concomitant medication will 
be coded according to the Sponsor’s drug dictionary.
12.8.2.
Drug Administration
Drug administration dates and times will be listed for each subject and treatment period.
12.9.
Pharmacodynamic Analysis
Note: In this study, the PD data collected refer to dECG data.
Primary analysis:
A linear mixed-effect concentration-QTcF model will be used as the primary analysis.  
Baseline-corrected and placebo-adjusted QTcF (ΔΔQTcF), using individual time-matched 
placebo for a given subject, will be the dependent variable and verinurad plasma 
concentrations will be the independent variable.  Fixed effects will be: intercept in the 
absence of a treatment effect, slope of the assumed linear association between 
concentration and ΔΔQTcF and baseline QTcF.  Random effects will be included on the 
intercept term and the slope.  ΔΔQTcF at the concentration of interest will be estimated.  
A prolonging effect will be excluded if the upper bound of the two-sided 90% confidence 
interval for model-derived ΔΔQTcF is estimated to be <10 ms at the highest clinically 

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relevant exposure.  Details of the concentration-QTcF modeling will be provided in a 
separate document (C-QT analysis plan).
Relevant exploratory plots will also be provided such as mean change from baseline QTcF 
vs. drug concentration, QTcF vs. RR and other dECG variables.
Calculations related to the PD variables will be performed by Parexel International.  
Parexel SOPs and Work Instructions will be used as the default methodology if not 
otherwise specified.  
For dECGs the lead V2 is used as the primary lead, with lead V5 as the primary backup 
lead and lead II as the secondary backup lead, for all time points when lead V2 is found to 
be unsuitable for analysis or evaluation.  Prior to the statistical analysis and summary, the 
ECG intervals will be smoothed into target time point values. 
After the smoothing of QT and RR into target time point values, the HR-corrected QT will 
be calculated (QTcF) using the standard formula.  All the statistical analyses will be 
performed using smoothed data.
The QTcF versus RR intervals will be plotted to confirm if HR-correction has been 
appropriate.
Digital ECG variables (absolute values and change from baseline for: HR, RR, PR, QRS, 
QT and QTcF) will be listed by subject and time point and summarised by treatment group 
using appropriate descriptive statistics (eg, n, geometric mean, arithmetic mean, SD, min, 
median, max, etc.); in addition, exploratory plots will be provided (such as time course for 
each dECG variable, changes from baseline for each dECG variable, by treatment group, 
mean with SD) and time course for ΔΔ: RR, HR, PR, QRS, QTcF for each treatment 
group. 
The QT and QTcF outliers (defined as values following dosing that are greater than 
450 ms or increases from baseline greater than 30 ms) will be summarised using 
cumulative counts and percentage under the following categories: 
1
absolute value >450 ms, 
2
absolute value >480 ms, 
3
absolute value >500 ms, 
4
increase from time-matched baseline >30 ms, 
5
increase from time-matched baseline >60 ms, 
6
absolute value >450 ms and increase from time-matched baseline >30 ms, 
7
absolute value >500 ms and increase from time-matched baseline >60 ms.
All PD analyses will be done on the PD Analysis Set.  The analysis population of the 
primary analysis will be defined in the C-QT analysis plan.

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Additional analyses of the dECG data will be performed and a corresponding summary 
table will be presented according to the guidance for the analysis and review of QT/QTc 
interval data published by Health Canada [23].
12.10.
Pharmacokinetic Analysis
12.10.1.
Pharmacokinetic Parameters
As appropriate and where possible, the following PK parameters will be assessed for 
verinurad, M1, M8, allopurinol, and oxypurinol using plasma concentrations.
AUC
Area under plasma concentration-time curve from time zero to infinity
AUC(0-t)
Area under the plasma concentration-time curve from time zero to time of last 
quantifiable concentration
Cmax
Maximum observed plasma concentration
tmax
Time to reach maximum observed plasma concentration
tlag
Time delay between drug administration and the first observed concentration in 
plasma
t½λz
Half-life associated with terminal slope (λz) of a semi-logarithmic concentration-
time curve
tlast
Time of last quantifiable plasma concentration
CL/F
Apparent total body clearance of drug from plasma after extravascular 
administration (parent drug)
Vz/F
Apparent volume of distribution during the terminal phase after extravascular 
administration (parent drug)
Vss/F
Apparent volume of distribution at steady state
MRT
Mean residence time of the unchanged drug in the systemic circulation from zero 
to infinity
The following diagnostic parameters for plasma PK analysis will be listed, but not 
summarised:
t lower
Start of exponential fit
t upper
End of exponential fit
λzN
Number of data points included in the log-linear regression analysis
Rsq-adj
Regression coefficient adjusted for λzN, Goodness-of-fit statistic for calculation of 
λz
%AUCextr
Percentage of AUC obtained by extrapolating the area under the plasma 
concentration-time curve from the time of the last quantifiable concentration to 
infinity
λz
Terminal elimination rate constant
Additional PK parameters may be determined where appropriate.

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12.10.2.
Derivation of Pharmacokinetic Parameters
The PK analyses of the plasma concentration data for verinurad, M1, M8, allopurinol, and 
oxypurinol will be performed by Covance Clinical Pharmacokinetic Alliance (CPKA), on 
behalf of AstraZeneca Research and Development (R&D).
PK parameters will be derived using non-compartmental methods with Phoenix®
WinNonlin® Version 8.1, or higher.  All descriptive and inferential statistical analyses will 
be performed using SAS® Version 9.4, or higher.
PK analysis will, where possible, be carried out using actual times recorded in the raw 
data.  If actual times are missing, nominal times will be used.
Plasma concentrations which are NQ prior to the first quantifiable concentration will be set 
to a value of zero.  After the first quantifiable concentration, any NQ plasma 
concentrations will be set to missing for all concentration profiles.  Where 2 or more 
consecutive concentrations are NQ at the end of a profile, the profile will be deemed to 
have terminated and therefore any further quantifiable concentrations will be set to missing 
for the calculation of the PK parameters unless it is considered to be a true characteristic of 
the profile of the drug.
If an entire concentration-time profile is NQ, the profile will be excluded from the PK 
analysis.
Cmax, tmax, tlag, tlast, t lower and t upper will be taken directly from the plasma 
concentration-time profile.
Terminal elimination half-life, calculated as (ln2)/λz, will be estimated by log-linear least 
squares regression of the terminal part of the concentration-time curve.  For the 
determination of λz, the start of the terminal elimination phase for each subject will be 
defined by visual inspection and will be the first point at which there is no systematic 
deviation from the log-linear decline in plasma concentrations (t lower). The last point 
(t upper) will be the time of the last quantifiable plasma concentration.  A minimum of 
3 data points will be used in calculating λz, and the duration of time over which λz is 
recommended to be at least 3 times the subsequently estimated terminal half-life.  Where 
an elimination half-life is estimated over less than 3 times the subsequently estimated 
terminal half-life, it will be flagged and commented upon in the study report and 
agreement reached with the Sponsor regarding exclusion of λz and dependent parameters 
(t½, λz, AUC, CL/F, MRT, Vz/F and Vss/F) from the corresponding statistical analyses.
The Rsq-adj value will also be calculated to show the goodness-of-fit of the choice of 
datapoints taking into consideration the number of points used in the estimation. Where 
the Rsq-adj value is <0.8 it will be flagged and commented upon in the CSR and 
agreement reached with the Sponsor regarding exclusion of λz and dependent parameters 
from the statistical analyses.

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AUC values (including AUC and AUC0-t) will be calculated using the linear trapezoidal 
method when concentrations are increasing and the logarithmic trapezoidal method when 
concentrations are decreasing (linear up, log down method). AUC is estimated by AUC0-t 
+ Clast/λz where Clast is the observed last quantifiable drug concentration. The AUC 
values where the percentage extrapolation is greater than 20% and any parameters 
dependent on AUC will be flagged in the data listings and agreement reached with the 
Sponsor on whether exclusions from the summary or formal statistics are required.
The minimum requirement for the calculation of AUC will be the inclusion of at least 
3 consecutive plasma concentrations above the lower limit of quantification (LLOQ), with 
at least 1 of these concentrations following Cmax.
Apparent clearance (CL/F) will be determined from the ratio of dose/AUC. Apparent 
volume of distribution based on the terminal phase (Vz/F) will be determined from the 
ratio of dose/λz*AUC.  Vss/F will be determined by multiplying CL/F by MRT. 
12.10.3.
Presentation of Pharmacokinetic Data
A listing of PK blood sample collection times, as well as derived sampling time deviations 
will be provided. Plasma concentrations will be summarised for the PK Analysis Set for 
each time point by analyte and treatment using the following descriptive statistics: n, n 
below LLOQ, geometric mean (gmean), geometric coefficient of variation [CV] (gCV%), 
arithmetic mean, arithmetic SD, gmean /* geometric SD (gSD) (gmean / gSD and gmean * 
gSD), median, minimum (min) and maximum (max).
The gmean is calculated as the exponential(μ) where μ is the arithmetic mean calculated 
using log-transformed data.
The gCV% is calculated as 100*sqrt[exp(s2)-1] where s is the SD of the log-transformed 
data.
The gmean /* gSD are calculated as exp[μ ± s].
Pharmacokinetic concentration data will be presented in the listings to the same number of 
significant figures as the data received from the bioanalytical laboratory (usually to 
3 significant figures) and against the same units as received. Pharmacokinetic 
concentration descriptive statistics will all be presented to 4 significant figures with the 
exception of the min and max which will be presented to 3 significant figures and n and 
n <LLOQ which will be presented as integers.
Individual concentrations with time deviations of greater than ±10% from the protocol 
scheduled time will be used in the PK analysis but will be flagged for exclusion from the 
summary tables and corresponding figures.
Plasma concentrations that are NQ, Not Reportable or missing will be handled as follows:

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Individual concentrations below the LLOQ of the bioanalytical assay will be reported as 
NQ in the listings with the LLOQ defined in the footnotes of the relevant tables, figures 
and listings. Individual plasma concentrations that are Not Reportable will be reported as 
no result (NR) and those that are missing will be reported as NS (No Sample) in the 
listings. Plasma concentrations that are NQ, NR or NS will be handled as follows for the 
provision of descriptive statistics:

Any values reported as NR or NS will be excluded from the summary tables and 
corresponding figures.

At a time point where less than or equal to 50% of the concentration values are NQ, 
all NQ values will be set to the LLOQ, and all descriptive statistics will be calculated 
accordingly.

At a time point where more than half of the values are NQ, the gmean, gmean * gSD, 
gmean - gSD and gCV% will be set to not calculable (NC). The maximum value will 
be reported from the individual data, and the minimum and median will be set to NQ.

If all values are NQ at a time point, no descriptive statistics will be calculated for that 
time point. The gmean, minimum, median and maximum will be reported as NQ and 
the gCV% and gmean /* gSD as NC.

The number of values below LLOQ (n <LLOQ) will be reported for each time point 
together with the total number of collected values (n).
Three observations >LLOQ are required as a minimum for a plasma concentration to be 
summarised. Two values >LLOQ are presented as a minimum and maximum with the 
other summary statistics as NC.
All reportable plasma PK parameters will be listed for each subject, analyte, and treatment. 
A separate listing will be provided for the diagnostic PK parameters.
Plasma PK parameters will be summarised for the PK Analysis Set by analyte and 
treatment using the following descriptive statistics:

Cmax, AUC, and AUC0-t: present n, gmean, gmean * gSD, gmean / gSD, arithmetic 
mean, arithmetic SD, gCV(%), median, min and max.

t½λz, CL/F, Vz/F, Vss/F and /MRT: present n, gmean, gmean * gSD, gmean / gSD, 
arithmetic mean, arithmetic SD, gCV(%), median, min and max.

tmax, tlag, and tlast: present n, median, min and max.

Diagnostic parameters (eg, λz, t upper, t lower, λzN, Rsq-adj and %AUCextr): listed 
only and not summarised.
Three values are required as a minimum for PK parameters to be summarised. Two values 
are presented as a min and max with the other summary statistics as NC.
If one or more values for a given parameter is zero (or imputed with zero), then no 
geometric statistics will be calculated for that parameter and the results for geometric 
statistics will be set to NA (not applicable).

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Pharmacokinetic parameter listings will be presented according to the following rules:

Cmax: present to the same number of significant figures as received from the 
bioanalytical laboratory

tmax, tlag, tlast, t lower and t upper time limit: present as received in the data, usually 
to 2 decimal places

AUC, AUC0-t, t½λz, CL/F, Vz/F, Vss/F, MRT, λz, %AUCextr, Rsq-adj: present to 
3 significant figures

n and λzN: present as an integer (no decimals)
The descriptive statistics for PK parameter data will all be presented to 4 significant 
figures with the exception of the min and max which will be presented to 3 significant 
figures apart from the following:

tmax, tlag, and tlast: present as received in the data, usually to 2 decimal places.
Pharmacokinetic data (concentrations and parameters) from subjects excluded from the PK 
Analysis Set will be included in the data listings, but not in the descriptive statistics, as 
appropriate.
Individual subject plasma concentrations versus actual time will be plotted for each analyte 
in linear and semi-logarithmic scale with all treatments overlaid on the same plot and 
separate plots for each subject.
Combined individual subject plasma concentration versus actual times will be plotted in 
linear and semi-logarithmic scale. Separate plots will be presented for each analyte and 
treatment.
Geometric mean plasma concentration (/* gSD) versus nominal sampling time will be 
plotted in linear and semi-logarithmic (no SD presented) scale for each analyte with all 
treatments overlaid on the same figure.
All gmean plots or combined plots showing all subjects by analyte and treatment will be 
based on the PK Analysis Set. Individual plots by subject will be based on the Safety 
Analysis Set.
For consistency, the plasma concentration values used in the gmean data graphs will be 
those given in the descriptive statistics summary table for each time point.
For gmean concentration-time plots, NQ values will be handled as described for the 
descriptive statistics; if the geometric mean is NQ, the value plotted will be zero for linear 
plots and missing for semi-logarithmic plots. Any gmean /* gSD error bar values that are 
negative will be truncated at zero on linear concentration-time plots and omitted from 
semi-logarithmic plots. 

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For individual plots, plasma concentrations which are NQ prior to the first quantifiable 
concentration will be set to a value of zero (linear plots only). After the first quantifiable 
concentration, any NQ plasma concentrations will be regarded as missing.
12.10.4.
Statistical Analysis of Pharmacokinetic Data
No inferential statistical analysis of PK parameters will be conducted.
12.11.
Pharmacokinetic/Pharmacodynamic Analysis
Additional population PK/PD analysis may be conducted in case of non-linear 
concentration-QTc relationship, large HR effect, or time delay between drug concentration 
and QTcF effect.
A detailed analysis plan of the primary C-QTc analysis will be prepared prospectively as a 
separate document (C-QTc analysis plan). It will include all technical details of the 
primary analysis modeling approach. 
12.12.
Analysis of Safety Data
Safety data (scheduled and unscheduled) will be presented in the data listings.  Continuous 
variables will be summarised using descriptive statistics (n, mean, SD, minimum, median, 
maximum) by treatment.  Changes (and/or percentage change) from baseline will be 
presented where applicable when baseline is defined.  Categorical variables will be 
summarised in frequency tables (frequency and proportion) by treatment.  The analysis of 
the safety variables will be based on the Safety Analysis Set.
Tabulations and listings of data for vital signs and clinical laboratory tests will be 
presented.  Data will be summarised for the observed values at each scheduled assessment, 
together with the corresponding changes (and/or percentage change) from the baseline 
when baseline is defined.  12-lead safety ECG data will be listed only.  Out-of-range 
values will be flagged in individual listings for safety laboratory findings, vital signs and 
12-lead safety ECGs findings.  Furthermore, out-of-range values will be summarised 
descriptively for safety laboratory findings and vital signs using agreed standard reference 
ranges and/or extended reference ranges (eg, AstraZeneca, program, or laboratory ranges).
12.12.1.
12-lead Safety Electrocardiogram
The 12-lead safety ECG results will be listed for each subject and out-of-range results will 
be flagged.  Abnormal findings may be classified as AEs if considered clinically 
significant by the Investigator.  See Section 13.2.6 for AE reporting.  
12.12.2.
Adverse Events
All AEs will be coded using MedDRA vocabulary and will be listed for each subject.  
Adverse events will be assigned to a treatment based on the start date/time of the AE in 
relation to dosing in that period; for tabulation purposes the AE will then be assigned to 
the treatment received in the respective treatment period as follows:

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
Screening: all AEs with start date/time prior to dosing in Treatment Period 1 (from 
time of randomisation for AEs and from time of signed ICF for SAEs).

Treatment Period 1: AEs with start date/time at the time of or after dosing in 
Treatment Period 1 until the time of dosing in Treatment Period 2.

Treatment Period 2: AEs with start date/time at the time of or after dosing in 
Treatment Period 2 until the time of dosing in Treatment Period 3.

Treatment Period 3: AEs with start date/time at the time of or after dosing in 
Treatment Period 3 until the final Follow-up Visit.
Adverse events with missing start dates/times will be handled as follows:

If the start date is completely missing but the end date is known and shows that the AE 
ended on or after the first dose date, then the start date will be imputed as the first day 
of dosing; if the end date is known and shows that the AE ended before the first dose 
date, then the screening date will be used for the start date.  If the end date is non-
informative (ie, is missing or does not contain enough information), the start date will 
be imputed as the first date of dosing;

If only the start day is missing the day will be imputed as the first day on which a dose 
was given in that month unless the end date is known and shows that the AE ended 
before a dose was given in that month; in which case the date will be imputed as 01.  
If the end date is non-informative (ie, is missing or does not contain enough 
information), the start date will be imputed as the first date of dosing in the known 
month.  If the month is not a dosing month the date will be imputed as 01;

If the start day and month are missing the date will be imputed as the first day of 
dosing in the known year unless the end date is known and shows that the AE ended 
before a dose was given in that year; in which case the start day and month will be 
imputed as 01Jan or with the date of screening if this is later.  If the end date is non-
informative (ie, is missing or does not contain enough information), the start date will 
be imputed as the first date of dosing in the known year.  If the year is not a year of 
dosing, then the date will be imputed as 01Jan or with the date of screening if this is 
later.

Missing times will be imputed as 00:00 h or with the time of dosing for events starting 
on a dosing day.
Adverse events will be summarised by treatment and overall for all subjects, including 
tabulations by causality and severity (mild, moderate and severe).  All tabulations will be 
presented by SOC and PT.  
All tabulations will include the number and percentage of subjects.  In addition, a separate 
tabulation will be presented showing the number of events by treatment and PT.
Finally, an overview of all AEs will be presented, separately for the number and 
percentage of subjects and the number of events.  This will include categories for any AE, 
SAEs, AEs leading to discontinuation of IMP (DAE) and AEs with outcome of death.
Listings of all AEs, SAEs, DAEs and AEs with outcome of death will be presented.  
Adverse events that occur before dosing will be presented separately.

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The following information will be included in the listings: verbatim term, SOC, PT and 
lowest level term, start date/time, end date/time, time from last dose, causality, action 
taken, whether the AE was classified as serious and the outcome.
12.12.3.
Laboratory Assessments
Haematology and clinical chemistry values will be listed by subject and time point 
including changes from baseline and repeat/unscheduled measurements.  Summary 
tabulations including absolute value and changes from baseline will be presented by 
treatment and time point for the Safety Analysis Set.  The baseline for the measurements 
will be the Day -1 assessment performed prior to dosing in each treatment period.  Shift 
tables will also be presented.
The listings will include the following information: test name, date of measurement, 
reference range, result and flags for any measurements that are out of range (eg,
AstraZeneca, program, or laboratory ranges).  Clinical laboratory data will be reported in 
Systeme International units in the CSR.
Additional listings will be presented for the following:

Urinalysis (macroscopic and microscopic, if applicable)

Pregnancy testing (including FSH)

Potential Hy's law case

The results of viral serology, SARS-CoV-2 PCR and drugs of abuse and alcohol 
screen will not be listed in the CSR.
12.12.4.
Vital Signs
The results of the vital signs measurements will be listed by subject and time point 
including the date/time of the assessment, changes from baseline and repeat/unscheduled 
measurements and out-of-range values.  The baseline for vital signs measurements will be 
the pre-dose assessment on Day 1 in each treatment period.  Descriptive statistics will be 
presented by treatment and time point for both observed values and changes from baseline.  
Shift tables will also be presented.
12.12.5.
Physical Examination
The baseline/Screening results of the physical examination will be documented in medical 
history for each subject.  These results will not be listed or summarised.
Any new or aggravated clinically relevant abnormal medical physical examination finding 
compared to the baseline assessment will be reported as an AE.

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13.
ADVERSE EVENTS
13.1.
Definitions
13.1.1.
Definition of Adverse Events
An AE is the development of any untoward medical occurrence in a subject or clinical 
study subject administered a medicinal product and which does not necessarily have a 
causal relationship with this treatment.  An AE can therefore be any unfavourable and 
unintended sign (eg, an abnormal laboratory finding), symptom (eg, nausea, chest pain), or 
disease temporally associated with the use of a medicinal product, whether or not 
considered related to the medicinal product.
The term AE is used to include both serious and non-serious AEs and can include a 
deterioration of a pre-existing medical occurrence.  An AE may occur at any time, 
including run-in or wash-out periods, even if no study treatment has been administered.
13.1.2.
Definitions of Serious Adverse Event
A serious AE is an AE occurring during any study phase (ie, run-in, treatment, wash-out, 
follow-up), that fulfills one or more of the following criteria:

Results in death

Is immediately life-threatening

Requires in-patient hospitalisation or prolongation of existing hospitalisation

Results in persistent or significant disability or incapacity or substantial disruption of 
the ability to conduct normal life functions

Is a congenital abnormality or birth defect

Is an important medical event that may jeopardize the subject or may require medical 
intervention to prevent one of the outcomes listed above.
For further guidance on the definition of a SAE, see Appendix A of this CSP.
Adverse events for malignant tumours reported during a study should generally be 
assessed as SAEs.  If no other seriousness criteria apply, the ‘important medical event’ 
criterion should be used.  In certain situations, however, medical judgment on an 
individual event basis should be applied to clarify that the malignant tumour event should 
be assessed and reported as a non-serious AE.  For example, if the tumour is included as 
medical history and progression occurs during the study, but the progression does not 
change treatment and/or prognosis of the malignant tumour, the AE may not fulfill the 
attributes for being assessed as serious, although reporting of the progression of the 
malignant tumour as an AE is valid and should occur.  Also, some types of malignant 
tumours, which do not spread remotely after a routine treatment that does not require 
hospitalisation, may be assessed as non-serious; examples include Stage 1 basal cell 
carcinoma and Stage 1A1 cervical cancer removed via cone biopsy.

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13.1.3.
Other Significant Adverse Events
During the evaluation of the AE data, an AstraZeneca medically qualified expert will 
review the list of AEs that were not reported as SAEs .  Based on the expert’s judgment, 
significant adverse events of particular clinical importance may, after consultation with the
Global Safety Physician, be considered Other Significant Adverse Events (OAEs) and 
reported as such in the CSR.  A similar review of other data from laboratory tests, vital 
signs, ECGs and other safety assessments will be performed for identification of OAEs.
Examples of these are marked haematological and other laboratory abnormalities, and 
certain events that lead to intervention (other than those already classified as serious), dose 
reduction or significant additional treatment.
13.2.
Recording of Adverse Events
13.2.1.
Time Period for Collection of Adverse Events
Adverse events will be collected from the start of randomisation throughout the treatment 
period and up to and including the Follow-up Visit.
Serious adverse events will be recorded from the time of informed consent.
13.2.2.
Follow-up of Unresolved Adverse Events
Any AEs that are unresolved at the subject’s last visit in the study are followed up by the 
Investigator for as long as medically indicated, but without further recording in 
ClinBase™.
AstraZeneca retains the right to request additional information for any subject with 
ongoing AE(s)/SAE(s) at the end of the study, if judged necessary.
13.2.3.
Variables
The following variables will be collected for each AE:

Adverse event diagnosis/description

The date and time when the AE started and stopped

Maximum intensity

Whether the AE is serious or not

Investigator causality rating against the IMP (yes or no)

AE caused subject’s withdrawal from study (yes or no)

Outcome
In addition, the following variables will be collected for SAEs:

Date AE met criteria for serious AE

Date Investigator became aware of serious AE

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
Date of hospitalisation

Date of discharge

Probable cause of death

Date of death

Autopsy performed

Causality assessment in relation to study procedure(s)

Causality assessment to other medication
The following intensity ratings will be used:
1
Mild (awareness of sign or symptom, but easily tolerated)
2
Moderate (discomfort sufficient to cause interference with normal activities)
3
Severe (incapacitating, with inability to perform normal activities)
It is important to distinguish between serious and severe AEs:

Severity is a measure of intensity whereas seriousness is defined by the criteria in 
Section 13.1.2.

An AE of severe intensity need not necessarily be considered serious.  For example, 
nausea that persists for several hours may be considered severe nausea, but not a SAE.  
On the other hand, a stroke that results in only a limited degree of disability may be 
considered a mild stroke but would be an SAE.
13.2.4.
Causality Collection
The Investigator will assess causal relationship between IMP and each AE, and answer 
“yes” or “no” to the question “Do you consider that there is a reasonable possibility that 
the event may have been caused by the IMP?”
For SAEs causal relationship will also be assessed for other medication, any additional 
drug and study procedures.  Note that for SAEs that could be associated with any study 
procedure the causal relationship is implied as “yes”.
A guide to the interpretation of the causality question is found in Appendix A of this CSP.
13.2.5.
Adverse Events Based on Symptoms and Signs
All AEs spontaneously reported by the subject or reported in response to the open question 
from the study personnel: “Have you had any health problems since you were last asked?”
or revealed by observation will be collected and recorded in ClinBase™.
When collecting AEs, the recording of diagnoses is preferred (when possible) to recording 
a list of signs and symptoms.

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However, if a diagnosis is known and there are other signs or symptoms that are not 
generally part of the diagnosis, the diagnosis and each sign or symptom will be recorded 
separately.
13.2.6.
Adverse Events Based on Examinations and Tests
The results from protocol-mandated laboratory tests, vital signs, ECGs and other safety 
assessments will be summarised in the CSR.
Deterioration as compared to baseline in protocol-mandated laboratory values, vital signs, 
ECGs and other safety assessments should therefore only be reported as AE if it fulfills
any of the SAE criteria, is clinically significant according to Investigator judgment, or is
the reason for discontinuation of treatment with the IMP.
If deterioration in a laboratory value or vital sign is associated with clinical signs and 
symptoms, the sign or symptom will be reported as an AE and the associated laboratory 
result or vital sign will be considered as additional information.
Wherever possible the reporting Investigator should use the clinical, rather than the 
laboratory term (eg, anemia versus low haemoglobin value).
In the absence of clinical signs or symptoms, clinically relevant deteriorations in 
non-protocol-mandated parameters should be reported as AE(s).
Any new or aggravated clinically relevant abnormal medical finding at a physical 
examination as compared with the baseline assessment will be reported as an AE.
13.2.7.
Hy's Law
Cases where a subject shows elevations in liver biochemistry may require further 
evaluation and occurrences of AST or ALT ≥3 × ULN together with total bilirubin 
≥2 × ULN may need to be reported as SAEs.  Please refer to Appendix C for further
instruction on cases of increases in liver biochemistry and evaluation of Hy’s Law.
13.2.8.
COVID-19
Confirmed and suspected SARS-CoV-2 infection and COVID-19 will be recorded as AEs.
13.3.
Reporting of Serious Adverse Events
All SAEs have to be reported, whether or not considered causally related to the IMP, or to 
the study procedure(s).  All SAEs will be recorded in ClinBase™.
If any SAE occurs in the course of the study, then the Investigator or other site personnel 
will inform appropriate AstraZeneca representatives immediately, or no later than 
24 hours of when he or she becomes aware of it.
The designated AstraZeneca representative will work with the Investigator to ensure that 
all the necessary information is provided to the AstraZeneca patient safety data entry site 

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within 1 calendar day of initial receipt for fatal and life-threatening events and within 
5 calendar days of initial receipt for all other SAEs.
For fatal or life-threatening AEs where important or relevant information is missing, active 
follow-up will be undertaken immediately.
The Investigator or other site personnel will inform AstraZeneca representatives of any 
follow-up information on a previously reported SAE immediately, or no later than 
24 hours of when he or she becomes aware of it.
The reference document for definition of expectedness/listedness is the IB for the 
AstraZeneca drug.
13.4.
Regulatory Reporting Requirements for Serious Adverse 
Events
Prompt notification by the Investigator to the Sponsor of a SAE is essential so that legal 
obligations and ethical responsibilities towards the safety of participants and the safety of a 
study intervention under clinical investigation are met.
The Sponsor has a legal responsibility to notify both the local regulatory authority and 
other regulatory agencies about the safety of a study intervention under clinical 
investigation.  The Sponsor will comply with country-specific regulatory requirements 
relating to safety reporting to the regulatory authority, IEC, and Investigators.
For all studies, except those utilizing medical devices, Investigator safety reports must be 
prepared for SUSARs according to local regulatory requirements and Sponsor policy and 
forwarded to the Investigators as necessary.
An Investigator who receives an Investigator safety report describing a SAE or other 
specific safety information (eg, summary or listing of SAEs) from the Sponsor will review 
and then file it along with the IB and will notify the IEC, if appropriate according to local 
requirements.

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14.
LEGAL AND ADMINISTRATIVE ASPECTS
14.1.
Archiving of Study Documents
All source documents generated in connection with the study will be retained in the limited 
access file storage area, respecting the privacy and confidentiality of all records that could 
identify the subjects.  Direct access is allowed only for authorized people for monitoring 
and auditing purposes.  Source documents will be handled, stored and archived according 
to in house procedures.
The Investigator's Site File will be archived by the CRO for 15 years after completion of 
the study.
14.2.
Publication of Study Results
All of the study information and data collected during the study are confidential and the 
property of AstraZeneca.  After completion of the study, AstraZeneca may prepare a joint 
publication with the Investigator.  The Investigator must undertake not to submit any data 
from this CSP for publication without prior consent of AstraZeneca at a mutually agreed 
time.
Authorship will be determined by mutual agreement and in line with International 
Committee of Medical Journal Editors authorship requirements.
14.3.
Clinical Study Report
An integrated CSR will be prepared in accordance with the standards of the ICH guideline 
for structure and content of clinical study reports (ICH E3).  Copies of the CSR will be 
provided to the IEC and the national regulatory authority in accordance with regulatory 
requirements and Parexel SOPs.  In the event of premature termination of the study or 
other conditions specified in ICH E3, an abbreviated CSR may be prepared.

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15.
LIST OF REFERENCES
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Campion EW, Glynn RJ, DeLabry LO. Asymptomatic hyperuricemia: risks and 
consequences in the Normative Aging Study. Am J Med 1987;82(3):421-6.
5
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Nucleosides Nucleotides Nucleic Acids 2011;30(12):1018-29.
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Chinese Rheumatology Association. Primary gout diagnosis and treatment guideline. 
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Nakagawa T, Hu H, Zharikov S, Tuttle KR, Short RA, Glushakova O, et al. A causal 
role for uric acid in fructose-induced metabolic syndrome. Am J Physiol Renal 
Physiol 2006;290(3):F625-31.
8
Grayson PC, Kim SY, LaValley M, Choi HK. Hyperuricemia and incident 
hypertension: a systematic review and meta-analysis. Arthritis Care Res (Hoboken) 
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Kodama S, Saito K, Yachi Y, Asumi M, Sugawara A, Totsuka K, et al. Association 
between serum uric acid and development of type 2 diabetes. Diabetes Care 
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10 Leyva F, Anker SD, Godsland IF, Teixeira M, Hellewell PG, Kox WJ, et al. Uric 
acid in chronic heart failure: a marker of chronic inflammation. Eur Heart J 
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11 Anker SD, Doehner W, Rauchhaus M, Sharma R, Francis D, Knosalla C, et al. Uric 
acid and survival in chronic heart failure: validation and application in metabolic, 
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12 Ioachimescu AG, Brennan DM, Hoar BM, Hazen SL, Hoogwerf BJ. Serum uric acid 
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cardiovascular disease: a preventive cardiology information system (PreCIS) 
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13 Kim SY, De Vera MA, Choi HK. Gout and mortality. Clin Exp Rheumatol 
2008;26(5)(suppl 51):S115-S19.
14 Jankowska EA, Ponikowska B, Majda J, Zymlinski R, Trzaska M, Reczuch K, et al. 
Hyperuricaemia predicts poor outcome in patients with mild to moderate chronic 
heart failure. Int J Cardiol 2007;115(2):151-5.
15 Verinurad Investigator’s Brochure, Edition 3, dated 01 November 2019.

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16 European Medicines Agency. Guidance on the Management of clinical trials during 
the COVID-19 (Coronavirus) pandemic, Version 3, dated 28 April 2020. Available 
from: https://ec.europa.eu/health/sites/health/files/files/eudralex/vol-
10/guidanceclinicaltrials_covid19_en.pdf
17 Food and Drug Administration; FDA Guidance on conduct of clinical trials of 
medical products during COVID-19 public health emergency, dated March 2020, 
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information/search-fda-guidance-documents/fda-guidance-conduct-clinical-trials-
medical-products-during-covid-19-public-health-emergency
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strategies-identify-mitigate-risks-first-human-early-clinical-trials-
investigational_en.pdf
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interval data. Mar 2010 [cited 25 Oct 2019]. Available from: 
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eng.pdf

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