A Phase 2, Randomized, Double-Blind, Placebo Controlled Study Evaluating the Safety, Tolerability, and Efficacy of GS-9674 in Subjects With Primary Sclerosing Cholangitis Without Cirrhosis
Phase: PHASE2
Conditions: Primary Sclerosing Cholangitis
Sponsor: Gilead Sciences

Study Title: 
Sponsor: 
IND Number: 
EudraCT Number: 
Clinical Trials.gov 
Identifier: 
Indication: 
Protocol ID: 
Gilead Clinical 
Program Manager: 
Gilead Medical 
Monitor: 
Protocol Version/Date: 
(r'J GILEAU 
CLINICAL STUDY PROTOCOL 
A Phase 2, Randomized, Double-Blind, Placebo Controlled Study 
Evaluating the Safety, Tolerability, and Efficacy ofGS-9674 in 
Subjects with Primruy Sclerosing Cholangitis Without Cinhosis 
Gilead Sciences, Inc. 
333 Lakeside D1i.ve 
Foster City, CA 94404 
U.S.A. 
131031 
2016-00244 2-23 
Not Available 
Pli.mruy Sclerosing Cholangitis (PSC) 
GS-US-428-4025 
Name: 
Telephone: 
Email: 
Name: 
Telephone: 
Fax: 
Email: 
01i.ginal: 
PPD 
1-'1-'U 
1-'1-'U 
~~gphen Djedjos, M.D. 
rl-'u 
29 June 2016 
CONFIDENTIALITY STATEMENT 
The infonnation contained in this document, prui:iculru·ly unpublished data, is the property or 
under control of Gilead Sciences, Inc., and is provided to you in confidence as an investigator, 
potential investigator, or consultant, for review by you, yom staff, and an applicable Institutional 
Review Boru·d or Independent Ethics Committee. The inf01mation is only to be used by you in 
connection with authorized clinical studies of the investigational drug described in the protocol. 
You will not disclose any of the inf01mation to others without w1i.tten authorization from 
Gilead Sciences, Inc., except to the extent necessruy to obtain infonned consent from those 
persons to whom the dmg may be administered. 

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TABLE OF CONTENTS
TABLE OF CONTENTS ..............................................................................................................................................2
LIST OF IN-TEXT TABLES........................................................................................................................................5
LIST OF IN-TEXT FIGURES ......................................................................................................................................5
PROTOCOL SYNOPSIS ..............................................................................................................................................6
GLOSSARY OF ABBREVIATIONS AND DEFINITION OF TERMS....................................................................14
1.
INTRODUCTION ..............................................................................................................................................18
1.1.
Background ............................................................................................................................................18
1.2.
GS-9674 .................................................................................................................................................19
1.2.1.
General Information .............................................................................................................19
1.2.2.
Nonclinical Toxicology........................................................................................................19
1.2.3.
Nonclinical Pharmacology ...................................................................................................20
1.2.4.
Nonclinical Pharmacokinetics..............................................................................................21
1.2.5.
Clinical Trials of GS-9674 ...................................................................................................22
1.3.
Rationale for this Study..........................................................................................................................26
1.3.1.
Risk/Benefit Assessment for the Study ................................................................................27
1.4.
Compliance ............................................................................................................................................27
2.
OBJECTIVES.....................................................................................................................................................28
3.
STUDY DESIGN................................................................................................................................................29
3.1.
Study Design..........................................................................................................................................29
3.2.
Treatment Plan and Regimen .................................................................................................................30
3.3.
Biomarker Testing..................................................................................................................................30
3.3.1.
Biomarker Samples to Address the Study Objectives:.........................................................30
3.3.2.
Biomarker Samples for Optional Future Research...............................................................31
3.3.3.
Biomarker Samples for Optional Genomic Research...........................................................31
4.
SUBJECT POPULATION..................................................................................................................................32
4.1.
Number of Subjects and Subject Selection ............................................................................................32
4.2.
Inclusion Criteria....................................................................................................................................32
4.3.
Exclusion Criteria...................................................................................................................................33
5.
INVESTIGATIONAL MEDICINAL PRODUCTS ...........................................................................................36
5.1.
Randomization, Blinding and Treatment Codes ....................................................................................36
5.1.1.
Procedures for Breaking Treatment Codes...........................................................................36
5.2.
Description and Handling of GS-9674 and PTM GS-9674....................................................................36
5.2.1.
Formulation..........................................................................................................................36
5.2.2.
Packaging and Labeling .......................................................................................................37
5.2.3.
Storage and Handling...........................................................................................................37
5.3.
Dosage and Administration of GS-9674/PTM GS-9674........................................................................37
5.4.
Prior and Concomitant Medications.......................................................................................................38
5.5.
Prohibited Medications ..........................................................................................................................38
5.6.
Accountability for GS-9674/ PTM GS-9674 .........................................................................................40
5.6.1
Investigational Medicinal Product Return or Disposal........................................................40
6.
STUDY PROCEDURES ....................................................................................................................................41
6.1.
Subject Randomization and Treatment Assignment ..............................................................................41
6.2.
Pretreatment Assessments-Screening Visit ............................................................................................41
6.3.
Blinded Study Phase: Baseline/Day 1 Randomization and Assessments...............................................42

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6.4.
Treatment Assessments (Blinded Study Phase) .....................................................................................44
6.4.1.
Weeks 1, 2, 4 and 8 (± 3 days) .............................................................................................44
6.4.2.
Week 12 (± 3 days) ..............................................................................................................45
6.5.
Blinded Study Phase follow-up Visit (±5 days).....................................................................................47
6.6.
Open Label Extension (OLE) Phase (± 5 days) .....................................................................................48
6.7.
Unscheduled Visits.................................................................................................................................49
6.8.
OLE follow-up Visit (±5 days) ..............................................................................................................50
6.9.
Assessments for Premature Discontinuation from Study.......................................................................50
6.10.
Criteria for Discontinuation of Study Treatment....................................................................................51
6.11.
PK and PD Substudy Visits....................................................................................................................51
6.12.
Procedures and Specifications................................................................................................................51
6.12.1.
Clinical Laboratory Analytes ...............................................................................................51
6.12.2.
Medical History....................................................................................................................53
6.12.3.
Physical Examination...........................................................................................................53
6.12.4.
Quality of Life (QoL) Measures and Pruritus Assessments .................................................53
6.12.5.
Electrocardiogram................................................................................................................54
6.12.6.
FibroScan® ...........................................................................................................................54
6.13.
End of Study...........................................................................................................................................54
6.13.1.
Sample Storage.....................................................................................................................55
7.
ADVERSE EVENTS AND TOXICITY MANAGEMENT...............................................................................56
7.1.
Definitions of Adverse Events, Adverse Reactions, and Serious Adverse Events.................................56
7.1.1.
Adverse Events.....................................................................................................................56
7.1.2.
Serious Adverse Events........................................................................................................56
7.1.3.
Clinical Laboratory Abnormalities and Other Abnormal Assessments as 
Adverse Events or Serious Adverse Events .........................................................................57
7.2.
Assessment of Adverse Events and Serious Adverse Events.................................................................57
7.2.1.
Assessment of Causality for Study Drugs and Procedures...................................................57
7.2.2.
Assessment of Severity ........................................................................................................58
7.3.
Investigator Requirements and Instructions for Reporting Adverse Events and Serious 
Adverse Events to Gilead.......................................................................................................................58
7.4.
Gilead Reporting Requirements.............................................................................................................60
7.5.
Toxicity Management ............................................................................................................................60
7.5.1.
PSC Specific Study Stopping Rule: .....................................................................................60
7.5.2.
Observation for Drug Induced Liver Injury (DILI):.............................................................60
7.6.
Special Situations Reports......................................................................................................................63
7.6.1.
Definitions of Special Situations..........................................................................................63
7.6.2.
Instructions for Reporting Special Situations.......................................................................64
8.
STATISTICAL CONSIDERATIONS................................................................................................................66
8.1.
Analysis Objectives and Endpoints........................................................................................................66
8.1.1.
Analysis Objectives..............................................................................................................66
8.1.2.
Primary Endpoint .................................................................................................................66
8.1.3.
Exploratory Endpoints..........................................................................................................67
8.2.
Analysis Conventions.............................................................................................................................67
8.2.1.
Analysis Sets ........................................................................................................................67
8.2.2.
Analysis by Study Phase ......................................................................................................69
8.3.
Data Handling Conventions ...................................................................................................................69
8.4.
Demographic Data and Baseline Characteristics ...................................................................................69
8.5.
Efficacy Analysis ...................................................................................................................................69
8.6.
Exploratory Analyses.............................................................................................................................70
8.7.
Safety Analysis.......................................................................................................................................70
8.7.1.
Extent of Exposure...............................................................................................................70
8.7.2.
Adverse Events.....................................................................................................................70

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8.7.3.
Laboratory Evaluations ........................................................................................................71
8.7.4.
Other Safety Evaluations......................................................................................................71
8.8.
Pharmacokinetic Analysis......................................................................................................................71
8.9.
Pharmacodynamics Analysis..................................................................................................................71
8.10.
Biomarker Analysis................................................................................................................................71
8.11.
Sample Size............................................................................................................................................72
8.12.
Data Monitoring Committee ..................................................................................................................72
9.
RESPONSIBILITIES..........................................................................................................................................73
9.1.
Investigator Responsibilities ..................................................................................................................73
9.1.1.
Good Clinical Practice..........................................................................................................73
9.1.2.
Institutional Review Board (IRB)/Independent Ethics Committee (IEC) 
Review and Approval...........................................................................................................73
9.1.3.
Informed Consent.................................................................................................................73
9.1.4.
Confidentiality......................................................................................................................74
9.1.5.
Study Files and Retention of Records ..................................................................................74
9.1.6.
Case Report Forms...............................................................................................................75
9.1.7.
Investigational Medicinal Product Accountability and Return.............................................76
9.1.8.
Inspections............................................................................................................................76
9.1.9.
Protocol Compliance............................................................................................................76
9.2.
Sponsor Responsibilities ........................................................................................................................77
9.2.1.
Protocol Modifications.........................................................................................................77
9.2.2.
Study Report and Publications .............................................................................................77
9.3.
Joint Investigator/Sponsor Responsibilities ...........................................................................................77
9.3.1.
Payment Reporting...............................................................................................................77
9.3.2.
Access to Information for Monitoring..................................................................................78
9.3.3.
Access to Information for Auditing or Inspections ..............................................................78
9.3.4.
Study Discontinuation..........................................................................................................78
10.
REFERENCES ...................................................................................................................................................79
11.
APPENDICES ....................................................................................................................................................81
Appendix 1.
Investigator Signature Page....................................................................................................82
Appendix 2.
Study Procedures Table for GS-US-428-4025 .......................................................................83
Appendix 3.
GSI Grading Scale for Severity of Adverse Events and Laboratory Abnormalities...............87
Appendix 4.
Pregnancy Precautions, Definition for Female of Childbearing Potential, and 
Contraceptive Requirements...................................................................................................88

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LIST OF IN-TEXT TABLES
Table 1-1.
Exposure Margins for GS-9674 Based on Observed GS-9674 Exposure After 
Administration of 100 mg GS-9674 QD Under Fed Conditions at Steady-State in 
Cohort 5 Compared to Exposures Observed at NOAEL Doses in Mouse and 
Cynomolgus Monkey .............................................................................................................20
Table 1-2.
Preliminary Safety Summary of Subjects Following Single- and Multiple-Dose 
Administration of GS-9674 Under Fasting or Fed Conditions in Healthy Volunteers 
(GS-US-402-1851) .................................................................................................................23
Table 1-3.
Preliminary Plasma Pharmacokinetic Parameters of GS-9674 Following Single- and 
Multiple-Dose Administration of GS-9674 Under Fasting or Fed Conditions in 
Healthy Volunteers (GS-US-402-1851) .................................................................................25
Table 1-4.
Preliminary Pharmacodynamic Parameters (FGF19 and C4) Following Multiple-
Dose Administration of Placebo, or GS-9674 Under Fasting or Fed Conditions in 
Healthy Volunteers (GS-US-402-1851) .................................................................................26
Table 5-1.
List of Prohibited Medications ...............................................................................................39
LIST OF IN-TEXT FIGURES
Figure 3-1.
Overall Study Design .............................................................................................................29

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PROTOCOL SYNOPSIS
Gilead Sciences, Inc.
333 Lakeside Drive
Foster City, CA 94404, U.S.A.
Study Title: 
A Phase 2, Randomized, Double-Blind, Placebo Controlled Study 
Evaluating the Safety, Tolerability, and Efficacy of GS-9674 in 
Subjects with Primary Sclerosing Cholangitis Without Cirrhosis
IND Number:
EudraCT Number:
Clinical Trials.gov 
Identifier:
131031
2016-002442-23
Not Available
Study Centers 
Planned:
Approximately 30 centers in North America and Europe
Objectives:
The primary objective of this study is to evaluate the safety and 
tolerability of GS-9674 in subjects with primary sclerosing 
cholangitis (PSC)
The exploratory objectives of this study are listed in Section 2. 
Study Design:
This is a Phase 2 randomized, double-blind, placebo controlled study 
evaluating the safety, tolerability, and efficacy of GS-9674 in subjects 
with PSC without cirrhosis.
The study will consist of 2 phases, a Blinded Study Phase and an 
Open Label Extension (OLE) Phase. 
Blinded Study Phase: Includes a 4-week screening period, 12 weeks 
of blinded treatment, and a Blinded Study Phase follow-up visit, 4 
weeks after completion of blinded treatment. 
Subjects completing the Blinded Study Phase without permanently 
discontinuing study drug will be eligible to participate in the OLE 
Phase of the study.
OLE Phase:  Includes a 96-week OLE and an OLE Phase follow-up 
visit 4 weeks after completion of open label treatment.
Participation in the Blinded Study Phase can last up to 20 weeks and 
the OLE Phase can last up to 100 weeks, thus total study duration can 
be up 120 weeks.
Subjects meeting the study’s entry criteria will be randomly assigned 
in a 2:2:1 ratio to 1 of 3 treatment groups during the Blinded Study 
Phase as shown in the figure below:

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Randomization will be stratified by the presence or absence of 
ursodeoxycholic acid (UDCA) use. 
Number of Subjects 
Planned:
Approximately 50 Subjects
Target Population:
Males and non-pregnant, females between 18-70 years of age with 
PSC without cirrhosis
Duration of 
Treatment:
Total study duration of up to 120 weeks with up to 20 Weeks for the 
Blinded Study Phase and up to 100 weeks for the OLE Phase.
Diagnosis and Main 
Eligibility Criteria:
Key inclusion and exclusion criteria are as follows:
Inclusion Criteria

Diagnosis of PSC based on cholangiogram (magnetic 
resonance cholangiopancreatography [MRCP], endoscopic 
retrograde cholangiopancreatography [ERCP], or 
percutaneous transhepatic cholangiogram [PTC]) within the 
previous 12 months;

Serum ALP >1.67 x ULN;

For subjects on ursodeoxycholic acid (UDCA), the dose of 
UDCA must have been stable for at least 6 months prior to 
screening through the end of treatment. For subjects not on 
UDCA, no UDCA use for at least before screening through 
the end of treatment;

For subjects being administered biologic treatments (eg, anti-
tumor necrosis factor [TNF] or anti-integrin monoclonal 
antibodies), immunosuppressants or systemic corticosteroids,  
the dose must have been stable at least 3 months prior to

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screening and anticipated to remain stable throughout the trial;

Screening FibroSURE/FibroTest® <0.75.
Exclusion Criteria

ALT > 10xULN;

Total bilirubin > 2x ULN;

INR >1.2 unless on anticoagulant therapy;

Serum albumin < 3.0 g/dL;

Cirrhosis of the liver as defined by any of the following:
a) Historical liver biopsy demonstrating stage 4 fibrosis 
according to the Ludwig classification (or equivalent); 
b) History of decompensated liver disease, including 
ascites, hepatic encephalopathy or variceal bleeding;
c) Liver stiffness >14.4 kPa by FibroScan®

Small-duct PSC (histologic evidence of PSC with normal bile 
ducts on cholangiography);

Other causes of liver disease including secondary sclerosing 
cholangitis and viral, metabolic, alcoholic, and other 
autoimmune conditions;

Ascending cholangitis within 60 days of screening;

Presence of a percutaneous drain or bile duct stent;

Use of fibrates or obeticholic acid within 3 months prior to
screening and through the end of treatment;

Current, active inflammatory bowel disease (IBD) defined as 
a partial Mayo score of > 2.
Please refer to section 4.2 and 4.3 of the protocol for detailed 
inclusion and exclusion criteria. 
Study Procedures/
Frequency:
Blinded Study Phase
After signing the informed consent form, subjects will complete a 
screening visit which will include the following assessments: 
complete medical history, complete physical examination (PE), vital 
signs, cirrhosis assessments, laboratory assessments (blood 
chemistry, hematology, coagulation panel, and biomarkers), 
calculation of partial Mayo score for subjects with IBD, serum 
pregnancy test (for females of childbearing potential), urine drug test
and review of adverse events (AEs) related to screening procedures 
and concomitant medications (CMs). 

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After the screening period, visits will occur at Baseline/Day 1 and at 
Weeks 1, 2, 4, 8, and 12. At minimum, vital signs, symptom-driven 
PE, safety laboratory tests (blood chemistry, hematology, and 
coagulation panel), calculation of partial Mayo score for subjects with 
IBD and review of adverse events and concomitant medications will 
be done at every visit. 
PPD 
Eligible subjects will be randomized to one of three treatment groups 
of the Blinded Study Phase. Prior to initial dosing, required 
Baseline/Day 1 assessments will be performed and will include, 
symptom-driven PE, vital signs, laboratory assessments, pregnancy 
tests (for females of child-bearing potential), urine, blood, and stool 
collection for biomarker assessments, pruritus assessments and 
Quality of Life (QoL) questionnaires, standard 12-lead ECG, 
FibroScan®, review of AEs and CMs. 
PPD 
While on study, subjects will undergo the following procedures and 
laboratory assessments: 
• 
Symptom-directed PE and vital signs at Baseline/Day 1 and at 
Weeks 1, 2, 4, 8 and 12 
• 
Height at Baseline/Day 1 and weight at all visits 
• 
FibroScan® (if available) at Baseline/Day 1 and Week 12 
• 
12-lead ECG at Baseline/Day 1 and Week 12 
• 
C-peptide, insulin and hemoglobin Ale (HbAlc) at Baseline/Day 
1 and Week 12 
• 
PK and PD sampling at Baseline/Day 1 (PD only) and at Weeks 
1, 2, 4, 8 and 12 
• 
Blood for Biomarker assessments at Baseline/Day 1 and at Weeks 
1, 4, and 12 
• 
Urine Biomarker collection at Baseline/Day 1 and at Weeks 1, 4, 
and 12 
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
Urine pregnancy testing (females of childbearing potential only) 
at Baseline/Day 1 and Weeks 1, 4, 8 and 12 

Stool collection at Baseline/Day 1 and Week 12

Hematology, blood chemistry,  coagulation panel (PT, PTT, INR) 
and fasting lipid profile at Baseline/Day 1 and Weeks 1, 2, 4, 8, 
and 12 

QoL Questionnaires: PBC-40, SF-36, and PSC Patient-Reported 
Outcome (PRO) at Baseline/Day 1 and Week 12 

Pruritus Assessments: Pruritus Visual Analog Scale (VAS) and 
5D-Itch questionnaire at Baseline/Day 1 and at Weeks 1, 2, 4, 8, 
and 12

Partial Mayo score calculation at Baseline/Day 1 and at Weeks 1, 
2, 4, 8, and 12 for subjects with IBD
At the Blinded Study Phase follow up visit, subjects will have a 
symptom-driven PE, vital signs, laboratory assessments, urine 
pregnancy tests (for females of childbearing potential), urine, stool 
and blood collection for biomarker assessments, QoL and pruritus 
questionnaires (PBC-40, SF-36, PSC-PRO, Pruritus VAS and 
5D-Itch), weight, review of AEs, and review of CMs and serum will 
be drawn for hematology, blood chemistry, and a coagulation panel.
Subjects will be unblinded to their Blinded Study Phase treatment 
assignment after the primary analysis has been completed, 
approximately 6 weeks after all subjects have completed the Blinded 
Study Phase.
During the Blinded Study Phase early termination (ET) visit, subjects 
who prematurely discontinue participation will complete Week 12 
assessments and will also complete the Blinded Study follow-up visit 
4 weeks after their last dose if possible.  
Open-Label Extension (OLE) Phase
Subjects who do not permanently discontinue study drug and 
complete the Blinded Study Phase follow-up visit will be eligible to 
enter into the OLE Phase of the study for 96 weeks. Subjects will 
begin open-label treatment with GS-9674 (100 mg po once daily).  
The dose of GS-9674 may be reduced from 100 mg to 30mg (or 
subsequently increased back to 100 mg) at the PI’s discretion with the 
approval of the Medical Monitor (MM), if required due to 
tolerability. In the OLE Phase, subjects will have in-clinic study 
assessments at OLE Baseline/Day 1, OLE Week 4, OLE Week 12, 
and every 12 weeks thereafter for symptom-driven PE, vital signs, 
laboratory assessments, urine pregnancy tests (for females of 

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Test Product: 
Reference Product: 
Dose and Mode of 
Administration: 
CONFIDENTIAL 
Final 
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childbearing potential), urine, stool and blood collection for 
biomarker assessments, calculation of partial Mayo score (subjects 
with IBD), QoL and pruritus questionnaires (PBC-40, SF-36, PSC 
PRO, Pruritus VAS and 5D-Itch), weight, and review of AEs and 
CMs. 
Subjects in the OLE Phase will the complete treatment Week 96 visit 
and then return for their final visit, the OLE follow up visit 4 weeks 
following the last dose of study drug. Subjects who prematurely 
discontinue participation in the OLE Phase will complete the Week 
96 assessments and will also complete the follow-up visit 4 weeks 
after their last dose if possible. 
At the OLE follow up visit, subjects will have a symptom-driven PE, 
measurement ofvital signs, review of AEs, CMs, pruritus and 
assessment and serum will be drawn for hematology, blood 
chemistry, lipids, and a coagulation panel. A urine pregnancy test will 
be performed for females of childbearing potential only. 
GS-9674 is supplied as 30 mg and 100 mg strength 
tablets. The tablets contain GS-9674-02 
mg 
are 
orange 
tablets and GS-9674 100 mg tablets are capsule-shaped, plain-faced, 
film-coated orange tablets. 
Placebo-to-match (PTM) GS-9674 tablets are identical in size, shape, 
color and appearance to their corresponding strengths of active 
GS-9674 tablets. PTM GS-9674 tablets contain the follow· 
• 
Treatment Group A: GS-9674 30 mg (1 x 30 mg tablet)+ PTM 
GS-9674 100 mg (1 x PTM 100 mg tablet) administered orally 
once daily with food. 
• 
Treatment Group B: GS-9674 100 mg (1 x 100 mg tablet)+ 
PTM GS-9674 30 mg (1 x PTM 30 mg tablet) administered orally 
once daily with food. 
Treatment Group C: PTM GS-9674 30 mg (1 x PTM 30 mg 
tablet)+ PTM GS-9674 100 mg (1 x PTM 100 mg tablet) 
administered orally once daily with food. 
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Criteria for 
Evaluation: 
Safety: 
Final 
Original 
The primary endpoint is the safety of GS-9674 in subjects with PSC 
without cirrhosis. 
Safety will be assessed during the study through the reporting of AEs, 
and by clinical laboratory tests and vital sign assessments at various 
time points during the study. Concomitant medication usage will also 
be assessed throughout the study. 
An independent, external Data Monitoring Committee (DMC) that 
consists oftwo hepatologists and a PhD statistician will convene once 
20 subjects have been randomized and every 3 to 4 months thereafter 
to monitor the study for safety events in Blinded Study Phase and 
every 6 month in the OLE Phase. The DMC will meet on an ad hoc 
basis ifthere are at least 3 similar Grade 2:: 3 serious, treatment related 
Common Terminology Criteria for Adverse Events (CTCAE) 
observed in the study. In the event of two similar treatment-related 
Grade 4 CTCAE events or one treatment-related Grade 5 CTCAE, 
the DMC will review the data and advise the sponsor regarding 
stopping or continuing the study. 
Efficacy: 
Efficacy will be assessed through a number of exploratory endpoints. 
These exploratory endpoints are described in Section 8.1.3. 
Pharmacokinetic and 
A single predose PK and PD blood sample will be collected at each 
Pharmacodynamic: 
on-treatment visit for all subjects. Plasma concentrations of GS-9674, 
GS-716070 (metabolite ofGS-9674), and other metabolites as 
appropriate, will be determined for PK analyses as applicable. Plasma 
or serum concentrations of FGF 19, C4, and bile acids will be 
determined as applicable for PD analyses. 
Statistical Methods: 
Safety Analysis: 
Efficacy Analysis: 
CONFIDENTIAL 
All safety data collected will be listed and be summarized, as 
appropriate, by treatment group. 
The biological and histological activity of study drugs will be 
evaluated using histologic endpoints and biomarker variables. 
PPD 
PPD 
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Exploratory 
Analysis: 
Sample Size: 
PPD 
Final 
Original 
Due to the exploratory nature of this study, no formal power 
calculations were used to determine sample size. The number of 
subjects was chosen based on clinical experience with other similar 
proof of concept studies. 
This study will be conducted in accordance with the guidelines of Good Clinical Practice (GCP) 
including archiving of essential documents. 
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GLOSSARY OF ABBREVIATIONS AND DEFINITION OF TERMS
C 
degrees Celsius
F
degrees Fahrenheit
AE
adverse event
ALT
alanine aminotransferase
ALP
alkaline phosphatase
AMA
anti-mitochondrial antibodies
Apo B
apolipoprotein B
aPTT
activated partial thromboplastine time
AST
aspartate aminotransferase
ATP
Adenosine triphosphate
AUC
area under the plasma/serum/peripheral blood mononuclear cell concentration 
versus time curve
-hCG
beta human chorionic gonadotropin
BAP
Biomarker Analysis Plan
BCRP
breast cancer resistance protein
BUN
blood urea nitrogen
BW
body weight
C4
7-alpha-hydroxy-4-cholesten-3-one
CFR
code of federal regulations
CrCL
creatinine clearance
Clast
last observed quantifiable plasma/serum concentration of the drug
Cmax
maximum observed plasma/serum concentration of drug
CMs
concomitant medications
CNS
central nervous system
CRO
contract (or clinical) research organization 
CTCAE
Common Terminology Criteria for Adverse Events
CSR
clinical study report
CYP3A
cytochrome P4503A
CV
cardiovascular
DILI
drug induced liver injury
DMC
Data Monitoring Committee
DNA
deoxyribonucleic acid
DSPH
Drug Safety and Public Health
EC50
Concentration of drug that gives half-maximum response
ECG
electrocardiogram
ET
early terminated
eCRF
electronic case report form
EDC
electronic data capture

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e.g.
example
ELF™Test
enhanced liver fibrosis test
ERCP
endoscopic retrograde cholangiopancreatography
EU
European Union
FAS
Full analysis set
FDA
(United States) Food and Drug Administration
FSH
Follicle-stimulating hormone
FGF
Fibroblast growth factor
FXR
Farnesoid X Receptor
GCP
good clinical practice
GCSF
granulocyte colony stimulating factor
GGT
gamma glutamyl transferase
GSI
Gilead Sciences, Inc.
HbA1c
Hemoglobin A1c
HBsAg
Hepatitis B surface antigen
HBV
Hepatitis B virus
Hct
Hematocrit
HDPE
High-density polyethylene
HCV
Hepatitis c virus
Hg
Hemoglobin
HIV
Human immunodeficiency virus
HLT
high-level term
HLGT
high-level group term
HMG-CoA
3-hydroxy-3-methylglutaryl-coenzyme A
HOMA-IR
homeostatic assessment of insulin resistance
IB
investigator’s brochure
IBD
inflammatory bowel disease
ICF
Informed Consent Form
ICH
International Conference on Harmonisation of Technical Requirements for 
Registration of Pharmaceuticals for Human Use
IEC
independent ethics committee
IMP
Investigational Medicinal Product
IND
Investigational New Drug (Application)
INR
international normalized ratio
IRB
institutional review board
IUD
intrauterine device
IWRS
interactive web response system
kg
Kilogram
LDH
lactate dehydrogenase
LLT
lower-level term

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MedDRA
Medical Dictionary for Regulatory Activities
g
Microgram
mg
Milligram
min
Minute
mL
Milliliter
mm
Millimeter
mm Hg
millimeters of mercury
MM
Medical Monitor
NAFLD
non-alcoholic fatty liver disease
NASH
non-alcoholic steatohepatitis
NTCP
sodium-taurocholate cotransporting polypeptide
NMR
nuclear magnetic resonance spectroscopy
NOAEL
no observed adverse event level
OATP
Organic anion-transporting polypeptide
OLE
Open Label Extension
PBC
Primary Biliary Cholangitis
PBMCs
peripheral blood mononuclear cell(s)
PD
Pharmacodynamic
PK
Pharmacokinetic
P-gp
P-glycoprotein
PO
taken by mouth
PRO
Patient –Reported Outcome
PSC
Primary Sclerosing Cholangitis
PT
preferred term
PTC
percutaneous transhepatic cholangiogram
PT
prothrombin time
PTT
Partial prothrombin time
QoL
Quality of Life
RBC
red blood cell count
RNA
ribonucleic acid
RXR
Retinoid X receptor
SADR
serious adverse drug reaction
SAE
serious adverse event
SAP
statistical analysis plan
SF-36
Short Form (36) Health Survey
SOC
System Organ Class
SOP
standard operating procedure
SUSAR
Suspected Unexpected Serious Adverse Reaction
t½
Time required for the terminal elimination half-life of the drug
TEAEs
Treatment emergent adverse events

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TGR5
bile acid receptor
TPO
thrombopoietin
TR-FRET
Time-resolved fluorescence resonance energy transfer
Tlast
last measured concentration
Tmax
time (observed time point) of Cmax
TNF
tumor necrosis factor
UDCA
ursodeoxycholic acid
UGT
uridine dophosphate glucuronosyltransferase
ULN
upper limit of the normal range
US
United States
Vss
Volume of distribution at steady state
VAS
visual analog scale
WBC
white blood cell count

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1.
INTRODUCTION
1.1.
Background
Primary Sclerosing Cholangitis (PSC) is a chronic biliary disease of unknown etiology 
characterized by a fibrosing cholangitis that leads to inflammation, cholestasis and cirrhosis. The 
overall incidence of PSC is 0.77 per 100,000 person-years, with a median age at diagnosis of 
41 years and 2-to-1 male to female predominance {Molodecky et al 2011}. PSC is highly 
associated with inflammatory bowel disease (IBD), typically ulcerative colitis (UC) with up to 
90% of PSC patients having associated IBD and conversely, PSC develops in approximately 8% 
of all IBD patients {Saich et al 2008}. There are approximately 30,000-45,000 patients with PSC 
in the United States, making it an orphan disease. PSC affects less than 1.6 in 10,000 people in 
the European Union (EU), equivalent to a total of fewer than 82,000 people. 
PSC is a progressive disease that leads to cirrhosis of the liver. The clinical presentation of PSC 
is variable, and ranges from asymptomatic disease with mild elevations in alkaline phosphatase 
(ALP) and transaminases to more rapidly progressive, symptomatic disease in 15-30% of all 
patients. In addition to complications related to cirrhosis and portal hypertension, patients with 
PSC are prone to repeated episodes of bacterial cholangitis, pruritus, and are at high risk for 
cholangiocarcinoma. Specifically, the lifetime risk of cholangiocarcinoma in patients with PSC 
is 10-15%, a rate 160-fold that of the general population {Saich et al 2008}. Mortality from PSC 
is estimated to be 35% over 10 years from diagnosis {Kornfeld et al 1997}.
There are no approved therapies for PSC. Medical therapy with ursodeoxycholic acid (UDCA) 
may improve liver biochemistry, but has no impact on symptoms or clinical outcomes {Triantos 
et al 2011}. Immunosuppressive therapy has also been ineffective {Lindor et al 2015}. Episodes 
of ascending cholangitis are managed supportively with antibiotics in conjunction with 
therapeutic drainage if necessary. Liver transplantation is the only therapeutic option currently 
available to patients with PSC. Outcomes of transplantation are generally favorable (five-year 
survival ~85%), but the disease recurs post-transplant in up to 25% of patients {Graziadei et al 
1999}.
The etiology of PSC is unknown. As noted above, there is a strong association with IBD and 
genome-wide association studies (GWAS) indicate moderate genetic associations with PSC. The 
strongest associations are in the HLA complex on chromosome 6p21 with weaker associations at 
loci known to be associated with IBD, chromosome 3p21, 2q35 and the GPC5/GPC6 region on 
chromosome 13q31 {Karlsen et al 2010}. Several hypotheses as to the underlying cause of the 
disease have been proposed including aberrant homing of T cells to the bile ducts, autoimmunity, 
bile acid toxicity, and gut bacterial translocation leading to fibrosing cholangitis, and subsequent 
cholestasis and hepatotoxicity.

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1.2.
GS-9674
1.2.1.
General Information
GS-9674 is a potent agonist of Farnesoid X Receptor (FXR) whose activity in intestinal 
epithelial cells results in the release of fibroblast growth factor 19 (FGF19). FGF19 is an 
endocrine peptide which drives a signaling cascade to decrease hepatic lipogenesis, 
gluconeogenesis, triglyceride accumulation, and bile acid synthesis.
Please refer to the Investigator’s Brochure (IB) for additional information on GS-9674 including:

In Vitro FXR agonism

Nonclinical Pharmacokinetics and In Vitro Metabolism

Nonclinical Pharmacology and Toxicology
1.2.2.
Nonclinical Toxicology
The nonclinical toxicity profile of GS-9674 has been assessed in mice and cynomolgus monkeys 
administered GS-9674 orally for 4 weeks in both species and for 13 weeks in monkeys and 
26 weeks (in-life phase only) in mice. GS-9674-related effects included non-adverse findings in 
the liver for both species that are likely related to the pharmacology of the compound. In both 
mice and cynomolgus monkeys, mild increases in alkaline phosphatase (ALP) activity, liver 
weight, and hepatocellular hypertrophy were observed after 4 weeks of dosing. Minimal oval cell 
hyperplasia was also observed in the liver of cynomolgus monkeys after 4 weeks of dosing. The 
increases in ALP activity and liver weights persisted but did not progress with longer term 
dosing in monkeys (13 weeks) but the histopathological changes were no longer evident. In 
mice, the ALP activity and liver weights were still present and were modestly more pronounced 
with longer term dosing (26 weeks). In mice, the above findings were observed at 
≥100 mg/kg/day after 4 weeks of dosing and at all doses (≥ 20 mg/kg/day) after 26 weeks of 
dosing.  In monkeys, the above findings were observed at doses of 300 mg/kg/day after both 
4 and 13 weeks of dosing. Decreases in cholesterol (≥60 mg/kg/day) and triglycerides 
(≥100 mg/kg/day) as well as increased albumin (≥60 mg/kg/day) observed in mice after 
4 and/or 26 weeks of dosing as well as the decrease in serum bile acids (300 mg/kg/day) in 
monkey after 13 weeks of dosing are also likely to be related to the pharmacology of GS-9674.
Other minimal to mild, non-adverse findings observed after 13 or 26 weeks of dosing in 
monkeys or mice, respectively, that were considered GS-9674-related included decreased red 
blood cell parameters (mouse; ≥20 mg/kg/day), increased platelets (mouse; 600/300 mg/kg/day), 
shortened activated partial thromboplastin time (monkey; 300 mg/kg/day), and increased 
phosphorus (mouse; 600/300 mg/kg/day). Findings present in monkeys after 13 weeks of dosing 
were reversible after a 4 week nondosing recovery period. In the 26 week mouse study, there 
were no adverse findings based on the in-life data at 60 mg/kg/day and the no-observed-adverse 
effect level (NOAEL) in monkeys after 13 weeks of dosing was 300 mg/kg/day. 

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Preliminary steady-state PK data from Cohort 5 (administration of GS-9674 100 mg with food) 
in the ongoing Phase 1 study of GS-9674 (GS-US-402-1851: Section 1.2.5.1) indicate adequate 
safety margins based on GS-9674 exposures at the nonclinical NOAEL doses in mouse and 
cynomolgus monkey (Table 1-1).
Table 1-1.
Exposure Margins for GS-9674 Based on Observed GS-9674 
Exposure After Administration of 100 mg GS-9674 QD Under Fed
Conditions at Steady-State in Cohort 5 Compared to Exposures 
Observed at NOAEL Doses in Mouse and Cynomolgus Monkey 
Species
NOAEL
Exposure Margina
Dose 
mg/kg/day
AUCtau
µg*hr/mL
Mouse
60b
110
22
Cynomolgus Monkey
300
110
22
a
Calculated using observed human AUCtau of 5.02 µg*hr/mL at 100 mg QD dose administered fed from cohort 5 in 
Study GS-US-402-1851.
1.2.3.
Nonclinical Pharmacology
GS-9674 is a potent and selective agonist of FXR. This conclusion is supported by the following 
data: 1) modeling demonstrated an interaction of GS-9674 with the binding domain of FXR/
Retinoid X receptor (RXR) consistent with agonist activity, 2) GS-9674 induced an agonist 
response in a time-resolved fluorescence resonance energy transfer (TR-FRET) biochemical 
assay with an EC50 of 16 nM, which was comparable to that of other known FXR agonists, and 
3) GS-9674 did not activate the structurally similar bile acid receptor TGR5, did not activate 
other nuclear hormone receptors, and did not bind to a panel of other off-target receptors and 
enzymes.
The cellular potency of GS-9674 to activate FXR-mediated transcription was characterized using 
a firefly luciferase reporter gene engineered under the control of a FXR/RXR response element 
(PC-402-2012). GS-9674 caused complete FXR activation with an EC50 value of 43 nM, which 
was more potent than chenodeoxycholic acid (EC50 of 1770 nM).
Oral dose-ranging experiments in male cynomolgus monkeys demonstrated maximal increases in 
plasma FGF19 at a dose of 5 mg/kg (PC-402-2016). In addition, the oral administration of 
GS-9674 (30 mg/kg) to cynomolgus monkeys directly activated intestinal FXR, as measured by 
the expression of FXR-target genes in the ileum (15-fold increase in FGF19 mRNA, and a 2-fold 
increase in organic solute transporter (OSTα and OSTβ mRNA) (PC-402-2005).
The effects of GS-9674 on FGF19 levels were compared in cynomolgus monkeys following both 
oral and intravenous (IV) administration (PC-402-2016). Despite greater exposures following IV 
administration, only the oral administration of GS-9674 increased circulating FGF19 levels. 
These data suggest that intestinal FXR agonism by GS-9674 causes FGF19 production, whereas 
low systemic free drug concentrations limit effects following IV administration of GS-9674.

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GS-9674 was evaluated in a choline-deficient high fat diet/NaN02 rat model of liver fibrosis 
(PC-402-2015). This in vivo model utilized "2 hits" to mimic the metabolic and oxidative stress 
components ofNASH disease in humans {Nakamoto et al2009}, {Murakami et al2013}. Treatment 
with GS-9674 dose-dependently reduced both biochemical and histological measures of liver 
fibrosis in this model. 
Safety pharmacology studies have been conducted to examine the potential effects ofGS-9674 
on the cardiovascular (CV), respiratory, and central nervous system (CNS) systems. There were 
no GS-9674-related effects on the CNS or respiratory system in mice administered up to 
600 mg/kg. In addition, there was no significant human ether-a-go-go-related gene inhibition at 
concentrations up to 100 J.lM or GS-9674-related effects on the CV system in monkeys 
administered up to 300 mg/kg. 
Overall, the results from these pharmacology studies demonstrate that GS-9674 is a potent and 
selective agonist of intestinal FXR with the potential to benefit patients with PSC by inducing 
FGF19 production and reducing bile acid levels. 
1.2.4. 
Non clinical Phannacokinetics 
when dosed as 
pH-dependents 
GS-9674 absorption. 
10% and 20% 
. Low, 
limiting 
The low systemic clearance (CL) of GS-9674 in rats, dogs and monkeys was considerably lower 
than the predicted hepatic clearance based on in vitro studies with hepatocytes. This discrepancy 
is most likely a result of protein-restricted clearance in vivo due to the very high plasma protein 
binding(> 99.6%) across species. The volume of distribution (V ss) ofGS-9674 was consistent 
with extracellular fluid (ranging from 0.16-0.21 Llkg) in rats, dogs, and monkeys. 
After oral dosing to albino and pigmented mice, C4C] GS-9674-derived radioactivity was 
distributed to most of the tissues, with the highest maximum concentrations of radioactivity 
determined in organs of absorption and excretion. Generally similar distribution patterns and 
tissue concentrations of C4C]GS-9674-derived radioactivity were observed in albino and 
pigmented mice with no observed binding to melanin. In both strains, no quantifiable 
radioactivity was detected in brain, suggesting C4C] GS-9674-derived radioactivity did not cross 
the blood-brain barrier. Fecal elimination was a predominant route of elimination of C4C] 
GS-9674-derived radioactivity in both mice (85.7% and 5.45% recovered in feces and urine, 
respectively) and monkeys (78.2% and 69.7% recovered in feces in intact and bile duct 
cannulated animals) likely representing drug not absorbed from the gastrointestinal tract. 
Approximately 6% of the administered radioactivity was excreted in bile and urine in monkeys. 
Radiolabeled material was primarily excreted within the first 48 hours. 
GS-9674 undergoes oxidative metabolism in human hepatocytes. Comparison of metabolism in 
hepatocytes from mice, rats, dogs, monkeys, and humans did not identify any metabolites unique 
to humans, supporting the selection of mice and monkeys for the assessment of the toxicology of 
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GS-9674. Of the recombinant human CYP isozymes tested, CYP2C8, CYP3A4, and CYP2C19 
were shown to metabolize GS-9674. Potent inhibitors of these CYPs therefore may affect 
metabolism of GS-9674. GS-9674 had little inhibitory effect on the activities of CYP1A2, 
CYP2B6, CYP2C19 or CYP2D6 (IC50 > 25 μM). For CYP2C8, CYP2C9, and CYP3A, IC50
values of 2.4 to 13.6 μM were obtained but GS-9674 was not a mechanism-based inhibitor of 
these enzymes. GS-9674 showed moderate inhibition of human UGT1A1, sodium-taurocholate 
cotransporting polypeptide (NTCP), and bile salt export pump (IC50 2.8-7.7 μM). GS-9674 
inhibited human OATP1B1, OATP1B3, and OATP2B1 with IC50 values of 0.68, 0.41, and 
0.21 μM, respectively. GS-9674 therefore has the potential to affect hepatic/intestinal uptake of 
OATP substrates or metabolism of CYP2C8, CYP2C9, or CYP3A4 substrates when its 
concentrations are sufficiently high. However, low solubility, high protein binding (> 99.98%) 
and low systemic levels reduce the potential for GS-9674 to cause drug-drug interactions via 
inhibition of metabolic enzymes and transporters.
GS-9674 was a substrate for efflux transporters P-glycoprotein and breast cancer resistance 
protein, as well as the uptake transporters OATP1B1, 1B3, and 2B1, and NTCP. Inhibitors or 
genetic polymorphisms affecting the activity of these transporters may affect GS-9674 intestinal 
absorption and hepatic uptake. This was illustrated in an in vivo study in monkeys where 
pretreatment with cyclosporin A, a known inhibitor of efflux transporters, increased the 
bioavailability of GS-9674 approximately 5-fold.
GS-9674 is highly selective for FXR over other nuclear hormone receptors in cell-based reporter 
assays, including those associated with potential for induction of human drug metabolizing 
enzymes and transporters (eg, pregnane X receptor, constitutive androstane receptor). Thus the 
liability of GS-9674 to cause drug-drug interactions through proteins regulated by these nuclear 
receptors is low.
1.2.5.
Clinical Trials of GS-9674
Ongoing clinical experience with GS-9674 includes a Phase 1 clinical study (GS-US-402-1851).  
A brief PK summary of results from this ongoing study is presented below.
1.2.5.1.
GS-US-402-1851
Study GS-US-402-1851 is an ongoing Phase 1, randomized, placebo-controlled, single- and 
multiple-dose study with 4 prespecified, staggered dose-escalation cohorts and 4 randomized, 
placebo-controlled, single- and multiple-dose cohorts with adaptive dose selection and dose 
frequency.
Preliminary data based on an interim safety analysis as of 22 June 2016 are provided in the 
following sections. A total of 105 subjects have been randomized into 7 cohorts. One subject 
withdrew consent after randomization but prior to dosing and was not replaced. Therefore, safety 
data described below includes 104 dosed subjects.
Subjects received single and multiple doses of GS-9674 at a dose of 10 mg QD (Cohort 1), 
30 mg QD (Cohort 2), 100 mg QD (Cohort 3), or 300 mg QD (Cohort 4) administered in a 

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fasting state, or GS-9674 100 mg QD administered in a fed state (Cohort 5), GS-9674 50 mg 
BID (Cohort 6), or 15 mg BID (Cohort 7). A summary of treatment-emergent adverse events 
(AEs) is provided in Table 1-2. Overall, the rate of any AEs was similar between subjects treated 
with GS-9674 or placebo. All AEs were Grade 1 or 2 in severity; AEs occurring in greater than 
two GS-9674 treated subjects were back pain (n = 5), diarrhea (n=3), and headache (n = 6).
Table 1-2.
Preliminary Safety Summary of Subjects Following Single- and 
Multiple-Dose Administration of GS-9674 Under Fasting or Fed 
Conditions in Healthy Volunteers (GS-US-402-1851)
Cohort 1: 
10 mg 
QD 
Fasted
(N = 12)
Cohort 2: 
30 mg 
QD 
Fasted
(N = 12)
Cohort 3: 
100 mg 
QD 
Fasted
(N = 12)
Cohort 4: 
300 mg 
QD 
Fasted
(N = 12)
Cohort 5:   
100 mg
QD
Fed       
(N = 12)
Cohort 6: 
50 mg 
BID
(N = 11a)
Cohort 7: 
15 mg 
BID
(N = 12)
Pooled 
Placebo
(N = 21)
Treatment-
Emergent 
Adverse 
Event
4 (33%)
3 (25%)
4 (33%)
3 (25%)
5 (42%)
3 (27%)
4 (33%)
5 (24%)
Treatment-
Emergent 
Adverse 
Event 
Related to 
Study 
Drug
0 (0%)
  0 (0%)
0 (0%)
0 (0%)
1 (8%)
0 (0%)
1 (8%)
0 (0%)
Grade 3 or 
4 
Treatment-
Emergent 
Adverse 
Event
0 (0%)
0 (0%)
0 (0%)
0 (0%)
0 (0%)
0 (0%)
0 (0%)
0 (0%)
Grade 2,3, 
or 4 
Treatment-
Emergent 
Adverse 
Event
0 (0%)
1 (8%)
1 (8%)
0 (0%)
1 (8%)
0 (0%)
0 (0%)
0 (0%)
a
1 subject withdrew consent after randomization prior to dosing and was not replaced.

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Grade 2 or 3 elevations in serum alanine aminotransferase (ALT) were seen in five (6%) 
GS-9674 treated subjects and one (5%) placebo treated subject. Of these, two GS-9674 treated 
subjects were noted to have grade 2 or 3 elevations of ALT during active treatment; one each in 
Cohort 6 (GS-9674 50 mg BID) and Cohort 7 (GS-9674 15 mg BID). The remaining subjects 
with elevated ALT were identified at the follow-up visit 4 days after completing study drug. In 
two of these subjects, elevated ALT was associated with very high serum creatine kinase levels, 
consistent with elevation due to strenuous exercise. All ALT elevations returned to baseline and 
were not associated with changes in bilirubin or coagulation parameters. There were no clinically 
important treatment- or dose-related trends in vital signs, ECG, or physical examination findings
in this study.
Preliminary PK parameters for GS-9674 after single- and multiple-dose administration of 10, 30, 
100 or 300 mg under fasting conditions and 100 mg under fed conditions in healthy volunteers 
are presented in Table 1-3. GS-9674 was rapidly absorbed with a median Tmax occurring between 
1.25 and 3.25 hours under fasting conditions. Across the dose levels tested, plasma 
concentrations declined in a bi-phasic manner with a median t1/2 of 5.56 to 12.8 hours. The lower 
observed median t1/2 of 5 to 6 hours in the 10 mg and 30 mg cohorts, respectively, may be a 
result of plasma concentrations falling below the limit of quantitation during the distributional 
phase of the profile. In general, GS-9674 AUC and Cmax increased less than dose proportionally 
above 10 mg upon single and multiple dosing. As expected based on the short GS-9674 t1/2 and 
once daily dosing, minimal to no accumulation was observed for GS-9674 AUC, Cmax or C24
from single to multiple dose administration. Administration of GS-9674 with food resulted in 
prolonged absorption of GS-9674 with an approximately 60% reduction in mean Cmax and 
approximately 35% reduction in mean AUC.  Plasma concentrations of GS-716070 (a metabolite 
of GS-9674 with ~40-fold less potency than GS-9674 against FXR) were analyzed in Cohort 5 
(GS-9674 100 mg administered fed).  The t1/2 of GS-716070 was similar to that of GS-9647 with
AUC and Cmax ~60% and 35%, respectively of that observed for GS-9674.  Similar to GS-9674, 
GS-716070 did not accumulate upon multiple dosing.  

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Table 1-3.
Preliminary Plasma Pharmacokinetic Parameters of GS-9674 
Following Single- and Multiple-Dose Administration of GS-9674 
Under Fasting or Fed Conditions in Healthy Volunteers 
(GS-US-402-1851)
Parameter 
Mean (%CV)
Cohort 1: 
10 mg Fasted
(N = 12)
Cohort 2: 
30 mg Fasted
(N = 12)
Cohort 3: 
100 mg Fasted
(N = 12)
Cohort 4: 
300 mg 
Fasted
(N = 12)
Cohort 5: 
100 mg Fed
(N = 12)
Single 
Dose
AUCinf 
(ng*h/ml)
1260 (30.3)
2480 (37.2)
7740 (93.9)
12,500 (33.9)
5020 (40.4)
Cmax (ng/ml)
304 (41.6)
580 (48.9)
2590 (118)
3060 (66.2)
928 (58.3)
C24 (ng/ml)
2.61 (49.9)b
6.04 (35.7)
23.5 (40.0)
76.0 (67.4)
26.8 (42.3)
Tmax (h)a
3.00
(2.38, 4.00)
3.00
(2.38, 3.63)
1.75
(1.38, 2.63)
1.25
(1.00, 3.13)
3.75
(2.88, 4.25)
T1/2 (h)a
5.56
(5.46, 6.41)
8.10
(5.74, 9.58)
11.2
(8.30, 11.9)
12.4
(11.4, 13.9)
10.9
(8.87, 11.6)
Multiple 
Dose
AUCtau 
(ng*h/ml)
1280 (35.8)
2890 (23.5)
6720 (59.2)
8490 (48.8)
4180 (46.8)
Cmax (ng/ml)
322 (42.4)
718 (32.8)
2230 (75.9)
2330 (81.5)
819 (53.4)
Ctau (ng/ml)
2.75 (55.5)
7.90 (50.3)
36.3 (42.5)
70.1 (56.3)
22.6 (37.4)
Tmax (h)a
2.50
(1.50, 3.50)
3.00
(1.88, 3.13)
1.50
(1.00, 2.63)
3.25
(1.00, 5.00)
3.50
(3.00, 4.25)
T1/2 (h)a
6.75
(5.64, 8.45)
5.95
(5.54, 6.55)
8.99
(6.84, 11.49)
12.8
(10.0, 14.7)
13.1
(10.3, 15.0)
Pharmacokinetic parameters are presented as Mean (%CV), and shown to 3 significant digits 
a
Tmax and T1/2 are presented as median (Q1, Q3)
b
N=11
Preliminary changes in FGF19 and C4 levels as measured by the primary PD parameters (AUC2-
8, Cmax, and Cmin) were determined to be the most sensitive measures of changes in FGF19 and 
C4 after multiple dose administration of placebo, 10, 30, 100 or 300 mg GS-9674 under fasting 
conditions and 100 mg under fed conditions in healthy volunteers are presented in Table 1-4. In
general, similar changes in PD parameters were observed after single or multiple dose 
administration (single dose data not shown). GS-9674 doses > 30 mg significantly increased 
FGF19 AUC2-8 and Cmax and reduced C4 AUC2-8 and Cmax. Administration of 100 mg GS-9674 
with food resulted in prolonged elevation of FGF19 plasma concentrations compared to 
administration of GS-9674 100 mg under fasting conditions. Across the dose range of 10 to 
300 mg GS-9674 administered fasted, GS-9674 exposure was weakly correlated with changes in 
FGF19 and moderately correlated with changes in C4 (Spearman correlation r = 0.45, p=0.002). 
Additionally, FGF19 and C4 AUC2-8 changes were inversely correlated (r = -0.335, p=0.02).

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Table 1-4.
Preliminary Pharmacodynamic Parameters (FGF19 and C4) 
Following Multiple-Dose Administration of Placebo, or GS-9674 
Under Fasting or Fed Conditions in Healthy Volunteers 
(GS-US-402-1851)
PD Parameter Ratio 
Compared to Day -1
GeoMean (%CV)
Placebo
GS-9674
Fasted
(N=12)
Fed
(N=3)
10 mg 
Fasted
(N=12)
30 mg 
Fasted
(N=12)
100 mg 
Fasted
(N=12)
100 mg 
Fed
(N=12)
300 mg 
Fasted
(N=12)
FGF19
Day 
20
AUC2-8
1.35
(53.9)
0.77 
(32.7)
3.07
(71.9)*
3.99
(42.0)*
3.61
(26.9)*
2.30 
(40.1)*
3.94
(62.0)*
Cmax
1.21
(48.0)
0.73 
(45.2)
2.05
(94.6)*
2.39
(45.9)*
2.32
(44.9)*
2.24 
(31.1)*
3.08
(57.0)*
C4
Day 
20
AUC2-8
1.24
(93.8)
0.98 
(41.9)
0.67
(86.8)*
0.39
(57.1)*
0.50
(101)*
0.69 
(71.3)
0.33
(97.8)*
Cmin
1.29
(78.7)
1.08 
(42.6)
0.78
(59.3)
0.37
(59.6)*
0.71
(72.6)*
0.45 
(80.5)*
0.44
(76.3)*
Pharmacodynamic parameters are presented as geometric mean ratio (arithmetic %CV), and shown to 3 significant digits
* p<0.05 compared to placebo
1.3.
Rationale for this Study
PSC is a disorder of unknown etiology characterized by inflammation and fibrosis of the 
intrahepatic and extrahepatic bile ducts that result in the impairment of bile flow (cholestasis). 
Accumulation of excess bile acids causes hepatocellular cytotoxicity that leads to progressive 
liver fibrosis and cirrhosis. In pre-clinical and clinical studies, FXR agonism has been shown to 
reduce bile acid levels via FGF19-mediated suppression of cholesterol-7-alpha-hydroxylase 
(CYP7A1), the rate-limiting enzyme in bile acid biosynthesis {Inagaki et al 2005}, {Pellicciari et al 
2002}, {Mudaliar et al 2013}. In addition, in a murine model of fibrosis caused by administration
of a methionine choline deficient diet and sodium nitrite injections, GS-9674 has demonstrated 
an anti-fibrotic effect. Thus, GS-9674 is postulated to be beneficial in subjects with PSC.  
This study will evaluate the safety, tolerability, and efficacy of 30 mg and 100 mg GS-9674 
administered with food for 12 weeks in subjects with PSC. The doses were selected based on 
short-term safety, PD and PK results from Study GS-US-402-1851 in healthy subjects. 
Across the range of GS-9674 doses evaluated (10 to 300 mg QD), doses > 30 mg provide 
comparable intestinal FXR agonism assessed by increases in plasma FGF19 exposure. Food, by 
slowing oral absorption of GS-9674, results in prolonged elevation of plasma FGF19 
concentrations. Exposure-response relationships show that changes in C4 exposure are 
negatively correlated with changes in FGF19 exposure as well as GS-9674 exposure. Based on 
these results, GS-9674 doses of 30 and 100 mg with food are selected for further study as they 
are expected to 1) provide enteral FXR agonism, reductions in bile acid pools, and liver 
biochemical improvements in subjects with PSC; and 2) inform regarding the impact of 
increasing systemic GS-9674 exposure on safety and efficacy.

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In the Phase 1 study, GS-US-402-1851, GS-9674 was tested at doses up to 300 mg once daily for 
up to 14 days and was well-tolerated. Taken together, these data support the evaluation of 
GS-9674 30 and 100 mg in subjects with PSC.
Inclusion criteria for this study were developed in order to identify subjects with PSC who have 
persistently abnormal blood markers of liver biochemistry but without cirrhosis. These subjects 
are at an increased risk of PSC-related complications including the need for liver transplantation 
and death. Subjects with clinical and histologic evidence of cirrhosis will be excluded from this 
study due to the uncertain PK and PD properties of GS-9674 in the setting of subjects with 
cirrhosis. Targeting interventions in the proposed study population will provide evidence for the 
safety and efficacy of GS-9674 in subjects at risk for progressive hepatic fibrosis and cirrhosis.
1.3.1.
Risk/Benefit Assessment for the Study 
Potential risks of a participant’s study involvement include unknown AEs, general risks 
associated with frequent clinic visits and laboratory blood draws, and the associated pain and 
discomfort of phlebotomy. Strategies to mitigate these risks include close monitoring of lab 
values as well as AEs.
It should be noted that there are no currently approved therapies specifically for the treatment of 
PSC. The only therapeutic option available to PSC subjects with advanced liver disease is liver 
transplantation.
Subjects with PSC randomized to the placebo control arm in the study may benefit from frequent 
medical monitoring and close assessment of their PSC and associated pathologies during the 
duration of placebo treatment. Subjects randomized to GS-9674 and those who receive GS-9674 
as part of the OLE phase, may benefit from an improvement in their underlying PSC which may 
manifest as improvements in liver biochemistry, measures of fibrosis, or improvements in quality 
of life. Importantly, this study will provide further data to inform the clinical development of the 
investigational medicinal product GS-9674 for use in an area of unmet medical need. 
Overall, the nonclinical and limited preliminary clinical data show a positive benefit/risk ratio in 
support of the study in subjects with PSC. The study will be conducted in accordance with GCP 
and all applicable rules and regulations. Appropriate safety monitoring will be conducted 
throughout the study to further characterize the safety profile of GS-9674 in subjects without 
cirrhosis due to PSC.
1.4.
Compliance
This study will be conducted in compliance with this protocol, Good Clinical Practice (GCP), 
and all applicable regulatory requirements.

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2. 
OBJECTIVES 
The primary objective of this study is as follows: 
• 
To evaluate the safety and tolerability of GS-9674 in subjects with PSC 
The exploratory objectives ofthis study are as follows: 
IT 
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3.
STUDY DESIGN
3.1.
Study Design
This is a Phase 2 randomized, double-blind, placebo-controlled study evaluating the safety, 
tolerability, and efficacy of GS-9674 in subjects with PSC without cirrhosis.
The study will consist of 2 phases, a Blinded Study Phase and an OLE Phase. 
Blinded Study Phase: Includes a 4-week screening period, 12-weeks of blinded treatment, and a 
Blinded Study Phase Follow up visit 4 weeks after completion of blinded treatment. 
Subjects completing the Blinded Study Phase without permanently discontinuing study drug will 
be eligible to participate in the OLE Phase of the study.
OLE Phase: Includes a 96-week OLE and an OLE Phase follow-up visit 4 weeks after 
completion of open label treatment.
The overall study design is presented graphically in Figure 3-1.
Figure 3-1.
Overall Study Design 

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3.2.
Treatment Plan and Regimen
Subjects meeting the study’s entry criteria will be randomly assigned in a 2:2:1 ratio to 1 of 3 
different treatment groups during the Blinded Study Phase as shown in Figure 3-1. 
Randomization will be stratified by the presence or absence of UDCA use.
Study drug(s) will be administered for a total of 12 weeks from the Baseline/Day 1 visit during 
the Blinded Study Phase and 96 weeks during the OLE Phase. Subjects will begin open-label 
treatment with GS-9674 (100 mg po daily). The dose of GS-9674 may be reduced from 100 mg 
to 30 mg (or subsequently increased back to 100 mg) at the PI’s discretion with the approval of 
the MM, as required.
Subjects will be unblinded to their Blinded Study Phase treatment assignment after the primary 
analysis has been completed, approximately 6 weeks after all subjects have completed the 
Blinded Study Phase.
Dosage and administration of the study drug(s) and reference product are described in 
Section 5.3.
3.3.
Biomarker Testing
3.3.1.
Biomarker Samples to Address the Study Objectives:
Biological specimens will be collected in this study as per the study procedures table
(Appendix 2) and will be used to evaluate the association of exploratory systemic biomarkers 
with study drug response, including efficacy and/or adverse events and to increase knowledge 
and understanding of the biology of PSC or related diseases such as Primary Biliary Cholangitis 
(PBC) and/or the validation of a companion diagnostic for PSC. Because biomarker science is a 
rapidly evolving area of investigation, and adverse events in particular are difficult to predict, it 
is not possible to specify prospectively all tests that will be done on the specimens provided.  The 
testing outlined is based upon the current state of scientific knowledge. It may be modified 
during or after the end of the study to remove tests no longer indicated and/or to add new tests 
based upon the growing state of art knowledge. Samples will be destroyed no later than 15 years 
after the end of the study.
Biomarker testing can include biomarkers that monitor auto-antibodies characteristic of PSC, and 
markers of bone metabolism. In addition biomarkers such as biochemicals, biological 
macromolecules, naturally occurring metabolites, and biomarkers of FXR activity (e.g. FGF19, 
C4 and bile acids) can also be determined.

GS-9674 
Protocol GS-US-428-4025 
Gilead Sciences, Inc. 
3.3.2. 
Biomarker Samples for Optional Future Research 
PPD 
3.3.3. 
Biomarker Samples for Optional Genomic Research 
PPD 
PPD 
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4.
SUBJECT POPULATION
4.1.
Number of Subjects and Subject Selection
This study will enroll approximately 50 adults, between 18 -70 years old with non-cirrhotic PSC.
4.2.
Inclusion Criteria
Subjects must meet all of the following inclusion criteria to be eligible for participation in this 
study.
1) Males and females between 18-70 years of age; inclusive based on the date of the screening 
visit;
2) Willing and able to give informed consent prior to any study specific procedures being 
performed;
3) Diagnosis of PSC based on cholangiogram (magnetic resonance cholangiopancreatography 
[MRCP], endoscopic retrograde cholangiopancreatography [ERCP], or percutaneous 
transhepatic cholangiogram [PTC]) within the previous 12 months;
4) Serum ALP >1.67 x ULN;
5) For subjects on UDCA, the dose of UDCA must have been stable for at least 6 months 
before screening through the end of the treatment. For subjects not on UDCA, no UDCA use 
for at least 6 month before screening through the end of the treatment;
6) For subjects being administered biologic treatments (eg, anti-tumor necrosis factor (TNF) or 
anti-integrin monoclonal antibodies), immunosuppressants or systemic corticosteroids, the 
dose must have been stable for at least 3 months prior to screening and anticipated to remain 
stable throughout the trial;
7) Screening FibroSURE/FibroTest® <0.75;
8) Platelet count ≥ 100,000/mm3;
9) Creatinine Clearance (CrCL) as calculated by the Cockcroft-Gault equation ≥ 60 ml/min;
10) Females of childbearing potential (as defined in Appendix 4) must have a negative serum 
pregnancy test at the Screening visit and a negative urine pregnancy test on the Baseline/Day 
1 visit prior to the first dose of study drug;
11) All female subjects of childbearing potential who engage in heterosexual intercourse must 
agree to use a highly effective method of contraception from the screening visit throughout 
the study period and for 30 days following the last dose of study drug(s) (see definition in 
Appendix 4);

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12) Male subjects with female partners of childbearing potential must use condoms during 
treatment and for 90 days after the last dose of study drug(s) (see Appendix 4 for details);
13) Male subjects must agree to avoid sperm donation from Baseline/Day 1 visit throughout the 
study period and for 90 days after the last dose of study drug(s) (see Appendix 4 for 
details);
14) Female subjects must refrain from egg donation and in-vitro fertilization during treatment 
and until at least 30 days after the last dose of study drug(s) (see Appendix 4 for details);
15) Willing and able to comply with scheduled visits, drug administration plan, laboratory tests, 
liver biopsies, other study procedures, and study restrictions;
16) Must be able to read and complete QoL questionnaires independently.
4.3.
Exclusion Criteria
Subjects who meet any of the following exclusion criteria are not to be enrolled in this study.
1) Pregnant or lactating females; lactating females must agree to discontinue nursing before the 
study drug (s) is administered;
2) ALT > 10x ULN;
3) Total bilirubin > 2x ULN;
4) INR > 1.2 unless on anticoagulant therapy;
5) Serum albumin < 3.0 g/dL;
6) Cirrhosis of the liver as defined by any of the following:
a) Historical liver biopsy demonstrating stage 4 fibrosis according to the Ludwig 
classification (or equivalent) 
b) History of decompensated liver disease, including ascites, hepatic encephalopathy or 
variceal bleeding
c) Liver stiffness >14.4 kPa by FibroScan;
7) Small-duct PSC (histologic evidence of PSC with normal bile ducts on cholangiography);
8) Other causes of liver disease including secondary sclerosing cholangitis and viral, metabolic, 
alcoholic, and other autoimmune conditions.
9) Positive anti-mitochondrial antibody;

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10) History of liver transplantation;
11) History of hepatocellular carcinoma or cholangiocarcinoma. If a dominant stricture is found, 
cholangiocarcinoma must be excluded prior to randomization;
12) Ascending cholangitis within 60 days of screening;
13) Presence of a percutaneous drain or bile duct stent;
14) Chronic hepatitis B (HBsAg positive);
15) Chronic hepatitis C (HCV antibody and RNA positive);
16) HIV Ab positive;
17) Current active inflammatory bowel disease (IBD) defined as a partial Mayo score of >2;
18) Known hypercoagulable condition or history of venous or arterial thromboembolic disease;
19) Alcohol consumption greater than 21 oz/week for males or 14 oz/week for females 
(1oz/30mL of alcohol is present in 1 12oz/360mL beer, 1 4oz/120mL glass of wine, and a 1 
oz/30 mL measure of 40% proof alcohol);
20) History of intestinal resection or malabsorptive condition that may limit the absorption of 
GS-9674. Prior cholecystectomy and appendectomy are permitted;
21) Use of fibrates or obeticholic acid within 3 months prior to screening through the end of 
treatment;
22) Positive urine screen for amphetamines, cocaine or opiates (i.e. heroin, morphine) at 
screening. Subjects on stable methadone or buprenorphine maintenance treatment for at least 
6 months prior to screening may be included in the study. Subjects with a positive urine drug 
screen due to prescription opioid-based medication are eligible if the prescription and 
diagnosis are reviewed and approved by the investigator;
23) Unstable cardiovascular disease as defined by any of the following:
a) Unstable angina within 6 months prior to screening
b) Myocardial infarction, coronary artery bypass graft surgery or coronary angioplasty 
within 6 months prior to screening
c) Transient ischemic attack or cerebrovascular accident within 6 months prior to screening
d) Obstructive valvular heart disease or hypertrophic cardiomyopathy
e) Congestive heart failure;

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24) Use of any prohibited concomitant medications 28 days prior to Baseline/Day 1 through the 
treatment period as described in Section 5.5 of protocol;
25) History of a malignancy within 5 years of screening with the following exceptions:
a) Adequately treated carcinoma in situ of the cervix
b) Adequately treated basal or squamous cell cancer or other localized non-melanoma skin 
cancer;
26) Any laboratory abnormality or condition that, in the investigator’s opinion, could adversely 
affect the safety of the subject or impair the assessment of study results;
27) Participation in another investigational study of a drug or device within 1 month prior or 
within 5 half-lives of the prior investigational agent (whichever is longer) prior to screening;
28) Concurrent participation in another therapeutic clinical study;
29) Known hypersensitivity to GS-9674, the metabolites, or formulation excipient;
30) Presence of any condition that could, in the opinion of the investigator, compromise the 
subject’s ability to participate in the study, such as history of substance abuse or a psychiatric
(including any subjects with a psychiatric hospital admission or emergency room visit in the 
2 years prior to screening) or medical condition;
31) Unavailable for follow-up assessment or concern for subject’s compliance with the protocol 
procedures.

GS-9674 
Protocol GS-US-428-4025 
Gilead Sciences, Inc. 
5. 
INVESTIGATIONAL MEDICINAL PRODUCTS 
5.1. 
Randomization, Blinding and Treatment Codes 
Final 
Original 
An Interactive Web Response System (IWRS) will be used for centralized randomization and 
treatment assignment. Randomization will be stratified by the presence or absence ofUDCA use. 
Investigative site personnel will obtain the subject's identification number and study drug 
assignment from the IWRS. Subjects and all personnel directly involved in the conduct of the 
study will be blinded to treatment assignment. 
Study drug(s) will be dispensed by the study pharmacist, or designee, in a blinded fashion to the 
subjects. 
5.1.1. 
Procedures for Breaking Treatment Codes 
In the event of a medical emergency where breaking the blind is required to provide medical care 
to the subject, the investigator may obtain treatment assignment directly from the IWRS system 
for that subject (refer to the Study Reference Binder for IWRS unblinding instructions). Gilead 
recommends but does not require that the investigator contact the Gilead medical monitor before 
breaking the blind. Treatment assignment should remain blinded unless that knowledge is 
necessary to determine subject emergency medical care. The rationale for unblinding must be 
clearly explained in source documentation and on the case report form/ electronic case report 
form ( eCRF), along with the date on which the treatment assignment was obtained. The 
investigator is requested to contact the Gilead medical monitor promptly in case of any treatment 
unblinding. 
Blinding of study treatment is critical to the integrity of this clinical trial and therefore, if a 
subject's treatment assignment is disclosed to the investigator, the subject will have study 
treatment discontinued. All subjects will be followed until study completion unless consent to do 
so is specifically withdrawn by the subject. 
Gilead Drug Safety and Public Health (DSPH) may independently unblind cases for expedited 
reporting of suspected unexpected serious adverse reactions (SUSARs ). 
5.2. 
Description and Handling ofGS-9674 and PTM GS-9674 
5.2.1. 
Formulation 
GS-9674 is supplied as 30 
contain GS-9674-02 
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Placebo-to-match (PTM) GS-9674 tablets are identical in size, shape, color and appearance to 
their corresponding 
of active GS-9674 tablets. PTM GS-9674 tablets contain the 
followin · 
clients: 
5.2.2. 
Packaging and Labeling 
GS-9674 tablets and PTM GS-9674 tablets are packaged in white, high-density polyethylene 
(HDPE) bottles. Each bottle contains 30 tablets, silica gel desiccant, and polyester packing 
material. Each bottle is enclosed with a white, continuous thread, child-resistant screw cap with 
an induction-sealed, aluminum-faced liner. 
Study drug(s) to be distributed to centers in the US and other participating countries shall be 
labeled to meet applicable requirements ofthe United States Food and Drug Administration 
(FDA), EU Guideline to Good Manufacturing Practice - Annex 13 (Investigational Medicinal 
Products), and/or other local regulations. 
5.2.3. 
Storage and Handling 
Study drug GS-9674 and PTM GS-9674 tablets and PTM GS-9674 tablets should be stored at 
controlled room temperature of 25°C (77°F); excursions are permitted between 15°C and 30°C 
(59°F and 86°F). Storage conditions are specified on the label. 
Until dispensed to the subjects, all bottles of study drugs should be stored in a securely locked 
area, accessible only to authorized site personnel. To ensure the stability and proper 
identification, study drug(s) should not be stored in a container other than the container in which 
they were supplied. Consideration should be given to handling, preparation, and disposal through 
measures that minimize drug contact with the body. Appropriate precautions should be followed 
to avoid direct eye contact or exposure when handling. 
5.3. 
Dosage and Administration of GS-967 4/PTM GS-967 4 
GS-9674 and PTM GS-9674 tablets will be provided by Gilead Sciences. In order to maintain the 
blind, each subject will be supplied with 2 bottles of tablets during the blinded phase of the trial. 
One bottle will contain GS-9674 30 mg or PTM GS-9674 30 mg, the second bottle will contain 
GS-9674 100 mg or PTM GS-9674 100 mg. Dosing for each treatment group will be as follows: 
• 
Treatment Group A: GS-9674 30 mg (1 x 30 mg tablet)+ PTM GS-9674 100 mg (1 x PTM 
100 mg tablet) administered orally once daily with food 
• 
Treatment Group B: GS-9674 100 mg (1 x 100 mg tablet)+ PTM GS-9674 30 mg (1 x 
PTM 30 mg tablet) administered orally once daily with food 
• 
Treatment Group C: PTM GS-9674 30 mg (1 x PTM 30 mg tablet)+ PTM GS-9674 
100 mg (1 x PTM 100 mg tablet) administered orally once daily with food 
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During the OLE Phase of the study subjects will be provided with 100 mg bottles of GS-9674
only, unless reassigned to 30 mg dose due to tolerability. The dose of GS-9674 may be reduced 
from 100 mg to 30 mg (or subsequently increased back to 100 mg) at the PI’s discretion with the 
approval of the MM, as required.
The study drug dose should be taken at approximately the same time each day with food.
A dose will be considered missed if the subject cannot take the dose within 12 hours of their 
regular dosing time. If a subject misses a dose, the subject should take their next dose at the 
regular dosing time.
5.4.
Prior and Concomitant Medications
Concomitant use of certain medications or herbal/natural supplements with study drug may result 
in PK and/or PD interactions resulting in increases or decreases in exposure of study drug(s) or 
these medications. 
Concomitant medications taken within 28 days of screening through the follow-up visit need to 
be recorded in the source documents and electronic Case Report Forms (eCRFs).
Subjects with co-morbid diseases requiring medication(s) must be taking the medication without 
a change in dose within 28 days of Baseline/Day 1.
5.5.
Prohibited Medications
The following medications are prohibited from 28 days prior to Baseline/Day 1 up to and 
including the day of the last dose of study drug:

Hematologic stimulating agents (e.g. erythropoiesis-stimulating agents (ESAs); granulocyte 
colony stimulating factor (GCSF); thrombopoietin (TPO) mimetics)

Investigational agents or devices for any indication

Concomitant use of certain medications or herbal/natural supplements (sensitive substrates, 
inhibitors or inducers of drug transporters P-gp, BCRP, or OATP, or the drug metabolizing 
enzyme CYP3A or inhibitors or inducers of CYP2C8) with study drug(s) may result in PK 
interactions resulting in increases or decreases in exposure of study drug(s) or concomitant 
medications. Examples of representative medications which are prohibited from 28 days 
prior to Baseline/Day 1 through the treatment period are listed below in Table 5-1

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Table 5-1.
List of Prohibited Medications
Drug Class
Agents Disallowed
Antibiotics
Azithromycin, Clarithromycin, Erythromycin
Acid Reducing Agents
Proton-Pump Inhibitors, H2-Receptor Antagonists, Antacidsa
Alpha 1-Adrenoceptor Antagonists
Alfuzosin
Anticonvulsantsb
Carbamazepine, Clonazepam, Ethosuximide, Oxcarbazepine, 
Phenobarbital, Phenytoin,  
Antidiabetics
Glyburide, Repaglinide
Antidepressants
Trazodone
Antifungals
Itraconazole, Ketoconazole, Voriconazole
Antigout
Colchicine
Antimycobacterialsb
Rifamycins, Isoniazid
Cardiac Medications
Amiodarone, Amlodipine, Bepridil, Digoxin, Diltiazem, 
Disopyramide, Dronedarone, Felodipine, Nicardipine, Nifedipine, 
Olmesartan, Ranolazine, Systemic Lidocaine, Telmisartan, 
Valsartan, Verapamil, Quinidine
Corticosteroids
Dexamethasone, Fluticasone
Endothelin Receptor Antagonists
Bosentan
Ergot Derivatives
Dihydroergotamine, Ergonovine, Ergotamine, Methylergonovine
GI Motility Agents
Cisapride
Herbal/Natural Supplementsb
St. John’s Wort, Echinacea. Milk thistle (i.e. silymarin), Chinese 
herb sho-saiko-to (or Xiao-Shai-Hu-Tang)
HMG-CoA Reductase Inhibitorsc
Atorvastatin, Fluvastatin, Lovastatin, Pitavastatin , Pravastatin, 
Rosuvastatin, Simvastatin
Inhaled Beta Agonists
Salmeterol
Phosphodiesterase Type 5 (PDE5) inhibitors
Sildenafil, Tadalafil, Vardenifil
Sedatives/Hypnotics
Buspirone, Clorazepate, Diazepam, Estazolam, Flurazepam, 
Midazolam, Triazolam, Zolpidem
Selective Serotonin Reuptake Inhibitors
Fluvoxamine
Other
Gemfibrozil, Modafinil, Sulfasalazine, Methotrexate
a
Antacids that directly neutralize stomach pH (i.e. Tums, Maalox) are permitted but may not be taken within 4 hours (before 
or after) study drug administration
b
May result in a decrease in the concentrations of study drug
c
Use with study drug may result in an increase in the concentration of the HMG-CoA Reductase Inhibitors. The 28 day 
washout period does not apply to HMG-CoA Reductase inhibitors, which can be taken up to the day before Baseline/Day 1
Medications for disease conditions excluded from the protocol (eg, HIV-1, HBV, or HCV 
infection, active cancer, transplantation) are not listed under this prohibited medication section 
and are disallowed in the study.

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5.6.
Accountability for GS-9674/ PTM GS-9674 
The investigator or designee (eg, pharmacist) is responsible for ensuring adequate accountability 
of all used and unused study drug bottles. This includes acknowledgement of receipt of each 
shipment of study drug (quantity and condition), subject dispensing records, and returned or 
destroyed study product. All used and unused study drug bottles dispensed to subjects must be 
returned to the site.
Study drug accountability records will be provided to each study site to:

Record the date received and quantity of study drug bottles

Record the date, subject number, subject initials, and the study drug bottle number dispensed

Record the date, quantity of used and unused study drug returned, along with the initials of 
the person recording the information.
5.6.1
Investigational Medicinal Product Return or Disposal
Refer to Section 9.1.7 for instructions regarding study drug return or disposal.

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6.
STUDY PROCEDURES
The study procedures to be conducted for each subject randomized in the study are presented in 
tabular form in Appendix 2 and described in the text that follows. Additional information is 
provided in Study Reference Binder.
The investigator must document any deviation from protocol procedures and notify the sponsor 
or contract research organization (CRO).
6.1.
Subject Randomization and Treatment Assignment
It is the responsibility of the investigator to ensure that subjects are eligible to participate in the 
study prior to randomization and throughout the study. 
Documentation of the personally signed and dated informed consent of each subject, using the 
study-specific ICF, is required before initiating the screening process.
After written informed consent has been obtained and eligibility to participate established, 
investigative site personnel will obtain the subject’s identification number and study drug 
assignment from the interactive web response system (IWRS).
6.2.
Pretreatment Assessments-Screening Visit
Subjects will be screened within 4 weeks before randomization to determine eligibility for 
participation in the study. The screening period may be extended under special circumstances 
with the explicit approval of the Medical Monitor. 
Screening labs may be repeated once within the screening period, prior to administration of study 
drug to rule out laboratory error, if any. This will be done at the discretion of the investigator.
The following will be performed and documented at Screening:

Obtain written informed consent before initiation of any screening procedures

Review and record whether the subject meets inclusion and exclusion criteria

Obtain screening number from IWRS

Obtain medical history 

Calculate partial Mayo Score for subjects with IBD

Complete physical examination 

Record vital signs, body weight and height

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
Obtain blood samples for
Chemistry
Hematology 
Coagulation Panel
Biomarkers
HIV-1/2, HBV and HCV Serology
Serum pregnancy test (female subjects of child bearing potential only)
Serum FSH (only for some female subjects - see Appendix 4) 

Cirrhosis assessment: FibroSURE/FibroTest®

Urine drug screen for amphetamines, cocaine and opiates (ie, heroin, morphine)

Record any SAEs and all AEs related to protocol mandated procedures occurring after 
signing of the consent form.

Record all concomitant medications (CMs) that the subject has taken within 28 days prior to 
screening
Subjects meeting all of the inclusion criteria and none of the exclusion criteria will return to the 
clinic within 4 weeks after screening for randomization into the study.
From the time of obtaining informed consent through the first administration of investigational 
medicinal product, record all serious adverse events (SAEs), as well as any AEs related to 
protocol-mandated procedures on the adverse events case report form (eCRF).  All other 
untoward medical occurrences observed during the screening period, including exacerbation or 
changes in medical history are to be captured on the medical history eCRF.  See Section 7
Adverse Events and Toxicity Management for additional details.
6.3.
Blinded Study Phase: Baseline/Day 1 Randomization and Assessments
Subjects returning to the clinic for randomization at Baseline/Day 1 will be instructed to fast (no 
food or drink, except water), starting from midnight or earlier, as appropriate, on the evening 
prior to the Baseline/Day 1 visit to ensure an approximate 8-hour fast prior to the blood sample 
collection under fasting condition the next morning.
After review of inclusion and exclusion criteria to confirm continued eligibility, subjects will be 
randomized to study drug assignment and receive their Subject Identification Number via the 

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IWRS prior to their first dose of study drug. Randomization will be stratified by the presence or 
absence of UDCA use. 
The following will be performed and documented at the Baseline/Day 1 visit prior to dosing: 
• 
QoL Questionnaires (PBC-40, SF-36 and PSC PRO) 
• 
Pruritus assessments (Pruritus VAS and 5D-Itch) 
Note: It is recommended that QoL questionnaires be completed prior to any study procedures 
being performed and prior to the subject seeing a health care provider. Refer to the Study 
Reference Binder for guidance on QoL questionnaire administration. 
• 
Calculate partial Mayo Score for subjects with IBD 
• 
Symptom-driven physical examination 
• 
Record vital signs, weight and height 
• 
Obtain Blood samples for: 
Chemistry 
Hematology 
Coagulation Panel 
Lipid Profile 
C-peptide, insulin and hemoglobin Ale (HbAlc) 
Biomarkers 
Single PD Sampling 
• 
Conduct standard 12-Lead ECG 
• 
Perform FibroScan® (if available) 
• 
Collect urine samples for: 
Urine pregnancy test for females of child bearing potential only 
Biomarkers 
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
Collect stool sample 

Dispense study drug, and provide subject with instruction on appropriate dosing and 
administration

Record all CMs that the subject has taken since the previous visit

Record any SAEs and all AEs occurring since the Screening visit
Once all visit procedures have been completed, subjects will take their Baseline/Day 1 dose of 
study drug with food while at the investigative site
Subjects will return to the investigative site at Week 1 (±3 days). 
6.4.
Treatment Assessments (Blinded Study Phase)
6.4.1.
Weeks 1, 2, 4 and 8 (± 3 days)
Subjects will be instructed to fast (no food or drink, except water), starting from midnight 
(00:00) or earlier, as appropriate, on the evening prior to ensure an approximate 8-hour fast prior 
to the fasted blood sample collection the next morning.
Subjects should also be instructed to HOLD their dose of study drug on the day of their visit until 
all visit procedures have been completed. The study drug dose should be taken with food after 
the visit.
The following treatment procedures/assessments are to be completed at the end of Weeks 1, 2, 4, 
and 8 for all subjects (see Appendix 2).

Pruritus assessments (Pruritus VAS and 5D-Itch)

Calculate partial Mayo Score for subjects with IBD

Symptom-driven physical examination

Record vital signs and body weight

Obtain blood samples for:
— Chemistry 
— Hematology 
— Coagulation Panel 
— Lipid Profile at Weeks 1, 4 and 8 only

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Biomarkers at Weeks 1 and 4 only 
Single PK and PD sampling 
• 
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Urine pregnancy testing (female of childbearing potential only) at Weeks 1, 4 and 8 only 
Biomarkers at Weeks 1 and 4 only 
• 
Dispense the study drug as directed by IWRS (if applicable) 
-
Review study drug compliance and drug administration instructions with subject 
-
Reconcile study drug administration using pill counts at Weeks 4 and 8 only 
• 
Record all CMs that the subject has taken since the previous visit 
• 
Record any SAEs and all AEs occurring since the previous visit 
6.4.2. 
Week 12 (± 3 days) 
Subjects will be instructed to fast (no food or drink, except water), starting from midnight 
(00:00) or earlier, as appropriate, on the evening prior to the Week 12 visits to ensure an 
approximate 8-hour fast prior to the fasted blood sample collection the next morning. 
The following treatment procedures/assessments are to be completed at this visit. 
• 
QoL Questionnaires (PBC-40, SF-36 and PSC PRO) 
• 
Pruritus assessments (Pruritus VAS and 5D-Itch) 
• 
Calculate partial Mayo Score for subjects with IBD 
• 
Symptom-driven physical examination 
• 
Record vital signs and body weight 
• 
Obtain blood samples for: 
-Chemistry 
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Hematology
Coagulation Panel
Lipid Profile
C-peptide,insulin and hemoglobin A1c
Biomarkers
Single PK and PD sampling

Obtain Urine samples for:
— Urine pregnancy testing (female of childbearing potential only)
— Biomarker assessments

Collect stool sample 

Conduct standard 12-Lead ECG

Perform FibroScan® (if available) 

Review study drug compliance
— Reconcile study drug administration using pill counts
— All study drugs should be returned at this visit

Record all CMs that the subject has taken since the previous visit

Record any SAEs and all AEs occurring since the previous visit
Once all visit procedures have been completed, subjects will self-administer their last dose of 
study drug while at the investigative site. 
If a subject discontinues treatment early for any reason they should complete the 12 week 
treatment visit assessment/ Early Termination Visit (ET) assessments then the follow up visit (4 
weeks following the last dose of the study drug) should be completed (see Appendix 2).

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6.5.
Blinded Study Phase follow-up Visit (±5 days)
Subjects will return for a Blinded Study Phase follow-up visit after completing their 12 weeks of 
treatment. The ET subjects should also complete the follow-up visit after completing the ET 
visit. 
The Blinded Study Phase follow-up visit will be completed 4 week post last dose of study drug.
The following will be performed and documented at this visit (see Appendix 2).

QoL Questionnaires (PBC-40, SF-36 and PSC PRO) 

Pruritus assessments (Pruritus VAS and 5D-Itch)

Calculate partial Mayo Score for subjects with IBD

Symptom-driven physical examination

Record vital signs and body weight

Obtain blood samples for:
— Chemistry
— Hematology
— Coagulation Panel
— Lipid Profile
— Biomarkers

Obtain Urine samples for:
— Urine pregnancy testing (females of childbearing potential only)
— Biomarkers

Record all CMs that the subject has taken since the previous visit

Record any SAEs and all AEs occurring since the previous visit
Subjects will be unblinded to their Blinded Study Phase treatment assignment after the primary 
analysis has been completed, approximately 6 weeks after all subjects have completed the 
Blinded Study Phase or early terminated.

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Subjects must have their OLE Baseline/Day 1 visit within 30 days of completing the Blinded 
Study Phase follow-up. 
If OLE Baseline/Day 1 and Blinded Study Phase follow-up visit is on the same day subjects 
should only complete OLE Baseline /Day 1 assessments.
6.6.
Open Label Extension (OLE) Phase (± 5 days)
Subjects will be instructed to fast (no food or drink, except water), starting from midnight 
(00:00) or earlier, as appropriate, on the evening prior to their visits to ensure an approximate 8-
hour fast prior to the fasted blood sample collection the next morning.
Subjects should also be instructed to HOLD their dose of study drug on the day of the 
Baseline/Day 1 visit until all visit procedures have been completed. The study drug dose should 
be taken with food after the visit.
The following treatment procedures/assessments are to be completed at the OLE Baseline/Day 1
Visit, followed by OLE Weeks 4, 12, 24, 36, 48, 60, 72, 84 and 96 weeks (see Appendix 2).

QoL Questionnaires (PBC-40, SF-36 and PSC PRO) 

Pruritus assessments (Pruritus VAS and 5D-Itch)

Calculate partial Mayo Score for subjects with IBD

Symptom-driven physical examination

Record vital signs and body weight

Obtain blood samples for
Chemistry
Hematology
Coagulation Panel
Lipid Profile
Biomarkers

Obtain Urine samples for:
— Urine pregnancy testing (females of childbearing potential only)
— Biomarkers at OLE Baseline/Day 1, Weeks 24, 48, 72 and 96 only

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
Collect stool sample at OLE Baseline/Day 1, Week 48 and Week 96 only

Dispense the study drug as directed by IWRS
Review study drug compliance and drug administration instructions with subject
— Reconcile study drug administration using pill counts
— Study drug should be returned at Week 96 visit

Record all CMs that the subject has taken since the previous visit

Record any SAEs and all AEs occurring since the previous visit
6.7.
Unscheduled Visits
Additional unscheduled assessments may be performed at the discretion of the investigator.
Subjects returning to the clinic for an unscheduled visit will be instructed to fast (no food or 
drink, except water), starting from midnight (00:00) or earlier, as appropriate, on the evening 
prior to the visit to ensure an approximate 8-hour fast prior to the blood sample collection under 
fasting condition the next morning.
Subjects should also be instructed to HOLD their dose of study drug on the day of an 
unscheduled visit until all visit procedures have been completed. The study drug dose should be 
taken with food after the visit.
At a minimum, the following will be performed and documented.

Calculate partial Mayo Score for subjects with IBD

Symptom-driven physical examination

Obtain blood samples for:
— Chemistry
— Hematology
— Single PK and PD should be collected for any unscheduled visit during Blinded Study 
Phase (Weeks 1 to 12 visits).

Record body weight

Record all CMs that the subject has taken since the previous visit

Record any SAEs and all AEs occurring since the previous visit

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6.8.
OLE follow-up Visit (±5 days)
Subjects will return for OLE follow-up visit after completing their OLE Week 96 visit. Subjects 
should also complete the follow-up visit after completing the ET visit for the OLE Phase. 
The OLE follow-up visit will be completed 4 week post last dose of study drug.
The following will be performed and documented at this visit (see Appendix 2).

Pruritus assessments (Pruritus VAS and 5D-Itch)

Calculate partial Mayo Score for subjects with IBD

Symptom-driven physical examination

Record vital signs and body weight

Obtain blood samples for:
— Chemistry
— Hematology
— Coagulation Panel
— Lipid Profile

Urine pregnancy test for female subjects of child bearing potential only 

Record all CMs that the subject has taken since the previous visit

Record any SAEs and all AEs occurring since the previous visit
6.9.
Assessments for Premature Discontinuation from Study
Subjects prematurely discontinuing from the study either during the Blinded Study Phase or 
during the OLE Phase (for example, as a result of an AE), should have an Early Termination 
(ET) visit completed followed by a follow-up visit 4 weeks after the last dose of the study 
medication. The study assessments to be performed at the ET visit are the same as those 
performed at the Week 12 visit (refer to Section 6.4.2) for ET subjects in the Blinded Study 
Phase and Week 96 visit for ET subjects in the OLE Phase (refer to Section 6.6). The study 
assessments to be performed at the follow-up visits are listed in Section 6.5 and 6.8 respectively. 
The subject will then be withdrawn from the study.
If these visits are not possible or acceptable to the subject or investigator, the subject may be 
withdrawn from the study. 

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6.10. 
Criteria for Discontinuation of Study Treatment 
Study medication may be discontinued in the following instances: 
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• 
Intercurrent illness that would, in the judgment of the investigator, affect assessments of 
clinical status to a significant degree. Following resolution of intercurrent illness, the subject 
may resume study dosing at the discretion of the investigator. 
• 
Unacceptable toxicity, or toxicity that, in the judgment of the investigator, compromises the 
ability to continue study-specific procedures or is considered to not be in the subject's best 
interest 
• 
Subject request to discontinue for any reason 
• 
Subject noncompliance 
• 
Pregnancy during the study; refer to Appendix 4. 
• 
Sponsor discretion 
• 
Discontinuation ofthe study at the request of Gilead, a regulatory agency or an institutional 
review board or independent ethics committee (IRB/IEC) 
6.11. 
PK and PD Substudy Visits 
6.12. 
Procedures and Specifications 
6.12.1. 
Clinical Laboratory Analytes 
Chemistry: 
Alanine aminotransferase ( AL T), aspartate aminotransferase (AS T), albumin, alkaline 
phosphatase (ALP), bicarbonate, blood urea nitrogen (BUN), calcium, chloride, creatinine, 
glucose, lactate dehydrogenase (LDH), magnesium, phosphorus, potassium, sodium, total and 
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direct bilirubin, total protein, uric acid, gamma-glutamyl transferase (GGT). Also includes 
C-Peptide, insulin and hemoglobin A1c (HbA1c) for the Baseline/Day1 and Week 12 visits.
Creatinine clearance is calculated by the Cockcroft-Gault equation {Cockcroft et al 1976} using 
actual body weight (BW). The calculation will be performed by the central laboratory.
Hematology:
Hematocrit (Hct), hemoglobin (Hb), platelet count, red blood cell count (RBC), white blood cell 
count (WBC) with differential (absolute and percentage) including lymphocytes, monocytes, 
neutrophils, eosinophils, and basophils and, reticulocyte count and mean corpuscular volume 
(MCV).
Coagulation Panel:
Prothrombin time (PT), partial thromboplastin time (PTT), and international normalized ratio 
(INR)
Pregnancy Tests:
Serum β-hCG or urine β-hCG (if positive, requires immediate confirmation with Serum β-hCG)
Additional Tests:
Lipid Profile, HIV-1, HBV & HCV Serology, urine drug screen (for amphetamines, cocaine, 
opiates), and genomic sample collection
Biomarker tests
Including but not limited to biomarkers of:
Circulating lipids - ApoB and NMR lipoprofile
Inflammation - hsCRP, TNF-α 
Bone formation – bone specific ALP and PTH
Liver fibrosis – ELF Test and FibroSURE/FibroTest®
FXR pathway activity - FGF19, C4 and bile acids
Urine samples:
Collected and stored for future biomarker testing (protein, albumin, retinol binding protein, β2-
microglobulin and creatinine)

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Single PK and PD plasma samples will be collected and archived for 1) PK analysis of GS-9674, 
GS-716070 (metabolite of GS-9674 ), and other metabolites as applicable, 2) to measure the 
concentration ofthe PD biomarkers FGF19 and C4. 
6.12.2. 
Medical History 
Medical history including details regarding illnesses and allergies, date(s) of onset, and whether 
condition(s) is currently ongoing, and medication history, including nicotine and alcohol use, 
will be collected on all subjects during screening. 
6.12.3. 
Physical Examination 
A complete physical examination should include source documentation of general appearance, 
and the following body systems: head, neck, and thyroid; eyes, ears, nose, throat, mouth, and 
tongue; chest (excluding breasts); respiratory; cardiovascular; lymph nodes; abdomen; skin, hair, 
nails; musculoskeletal and neurological. 
The focus of a symptom-driven physical examination will be determined by the investigator 
based on subject complaint. For example if a subject complains of a cough a respiratory exam 
should be performed. If consistent with pneumonia (e. g. rales or crackles are identified) then an 
AE would be documented. 
Height and body weight will be collected at specified time points. 
6.12.4. 
Quality of Life (QoL) Measures and Pruritus Assessments 
It is recommended that these questionnaires be completed prior to the clinical and laboratory 
assessments. The subject should read the questionnaires by himself/herself and record the 
answers by himself/herself. 
6.12.4.1. 
Short Form-36 (SF-36) Health Survey 
The SF-36 Health Survey asks 36 questions to measure functional health and well-being from the 
subject's point of view and consists of eight health domains (physical functioning, role-physical, 
bodily pain, general health, vitality, social functioning, role-emotional, and mental health). These 
health domain scales contribute to the physical health and mental health summary measures. 
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6.12.4.2.
Partial Mayo Score
The partial Mayo score is a survey for the assessment of IBD that considers stool frequency, 
rectal bleeding, and a physician’s global assessment of disease severity.
6.12.4.3.
PSC Patient-Reported Outcome (PRO) Measure
The PSC PRO addresses the severity of common, everyday symptoms of PSC (e.g. pruritus, 
fatigue, right upper quadrant abdominal discomfort) and their functional impact (e.g. on physical 
function, activities of daily living, work productivity, etc.). 
6.12.4.4.
Primary Biliary Cirrhosis-40 (PBC-40) Questionnaire
The PBC-40 is a health-related QoL questionnaire that includes 40 questions regarding PBC-
related symptoms including itch, fatigue, cognition, and social and emotional assessments
symptoms that are also relevant to the PSC population.  
6.12.4.5.
Pruritus Visual Analog Scale (VAS) measure
The Pruritus VAS is a tool that uses a numeric scale for measuring the intensity of pruritus.
6.12.4.6.
5D-Itch Questionnaire
The 5D- Itch questionnaire is a validated survey for the assessment of the severity of pruritus in 
patients with chronic pruritus due to dermatological and non-dermatological disorders. 
6.12.5.
Electrocardiogram
Standard 12-lead electrocardiogram (ECG) assessments will be performed. The Investigator will 
review the ECGs for any clinically significant abnormalities to ensure subject safety. Abnormal 
ECG findings that are considered clinically significant by the Investigator and meet the 
definition of an AE should be reported and recorded in the AE eCRF page.
6.12.6.
FibroScan® 
Liver stiffness will be assessed by FibroScan®. It is required that each subject’s FibroScan®
assessments be done with the same type of probe at each study visit. If FibroScan® is not 
available at a site the test may be omitted.
Please refer to the Study Reference Binder for instructions on FibroScan® measurements.
6.13.
End of Study
End of study is defined as when the last patient last visit (LPLV) for the OLE follow-up visit 
occurs 4 weeks after completing OLE treatment or the OLE ET follow-up visit, whichever 
occurs later.

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6.13.1.
Sample Storage
Residual biological samples from all visits will be frozen and stored. These stored samples may 
be used by Gilead or our research partners to help answer questions about the study drug, PSC 
and its associated conditions, or clinical laboratory testing to provide additional safety data. No 
human genetic testing will be performed without express consent of the study subjects. At the 
conclusion of this study, these samples may be retained in storage for Gilead for a period of up to 
15 years.

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7.
ADVERSE EVENTS AND TOXICITY MANAGEMENT
7.1.
Definitions of Adverse Events, Adverse Reactions, and Serious Adverse 
Events
7.1.1.
Adverse Events
An adverse event (AE) is any untoward medical occurrence in a clinical study subject 
administered a medicinal product, which does not necessarily have a causal relationship with the
treatment. An AE can therefore be any unfavorable and/or unintended sign, symptom, or disease 
temporally associated with the use of a medicinal product, whether or not considered related to 
the medicinal product. AEs may also include pre- or post-treatment complications that occur as a 
result of protocol specified procedures, overdose, drug abuse/misuse reports, or occupational 
exposure. Preexisting events that increase in severity or change in nature during or as a 
consequence of participation in the clinical study will also be considered AEs.
An AE does not include the following:

Medical or surgical procedures such as surgery, endoscopy, tooth extraction, and transfusion.
The condition that led to the procedure may be an adverse event and must be reported

Pre-existing diseases, conditions, or laboratory abnormalities present or detected before the 
Screening visit that do not worsen

Situations where an untoward medical occurrence has not occurred (eg., hospitalization for 
elective surgery, social and/or convenience admissions)

Overdose without clinical sequelae (see Section 7.6.1)

Any medical condition or clinically significant laboratory abnormality with an onset date 
before the consent form is signed and not related to a protocol-associated procedure is not an 
AE. It is considered to be pre-existing and should be documented on the medical history 
CRF.
7.1.2.
Serious Adverse Events
A serious adverse event (SAE) is defined as an event that, at any dose, results in the following:

Death

Life-threatening (Note: The term “life-threatening” in the definition of “serious” refers to an 
event in which the subject was at risk of death at the time of the event; it does not refer to an 
event that hypothetically might have caused death if it were more severe.)

In-patient hospitalization or prolongation of existing hospitalization

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
Persistent or significant disability/incapacity

A congenital anomaly/birth defect

A medically important event or reaction: such events may not be immediately 
life-threatening or result in death or hospitalization but may jeopardize the subject or may 
require intervention to prevent one of the other outcomes constituting SAEs. Medical and 
scientific judgment must be exercised to determine whether such an event is a reportable 
under expedited reporting rules. Examples of medically important events include intensive 
treatment in an emergency room or at home for allergic bronchospasm; blood dyscrasias or 
convulsions that do not result in hospitalization; and development of drug dependency or 
drug abuse. For the avoidance of doubt, infections resulting from contaminated medicinal 
product will be considered a medically important event and subject to expedited reporting 
requirements.
7.1.3.
Clinical Laboratory Abnormalities and Other Abnormal Assessments as 
Adverse Events or Serious Adverse Events
Laboratory abnormalities without clinical significance are not recorded as AEs or SAEs. 
However, laboratory abnormalities (eg, clinical chemistry, hematology, and urinalysis) that 
require medical or surgical intervention or lead to study drug interruption, modification, or 
discontinuation must be recorded as an AE, as well as an SAE, if applicable. In addition, 
laboratory or other abnormal assessments (eg, electrocardiogram, x-rays, vital signs) that are 
associated with signs and/or symptoms must be recorded as an AE or SAE if they meet the 
definition of an AE or SAE as described in Sections 7.1.1 and 7.1.2. If the laboratory 
abnormality is part of a syndrome, record the syndrome or diagnosis (eg, anemia), not the 
laboratory result (ie, decreased hemoglobin).
For specific information on handling of clinical laboratory abnormalities in this study, please 
refer to (Section 7.5).
7.2.
Assessment of Adverse Events and Serious Adverse Events
The investigator or qualified subinvestigator is responsible for assessing AEs and SAEs for 
causality and severity, and for final review and confirmation of accuracy of event information 
and assessments.
7.2.1.
Assessment of Causality for Study Drugs and Procedures
The investigator or qualified subinvestigator is responsible for assessing the relationship to 
GS-9674 therapy using clinical judgment and the following considerations:

No: Evidence exists that the adverse event has an etiology other than the GS-9674. For 
SAEs, an alternative causality must be provided (eg, pre-existing condition, underlying 
disease, intercurrent illness, or concomitant medication).

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
Yes: There is reasonable possibility that the event may have been caused by the 
investigational medicinal product.
It should be emphasized that ineffective treatment should not be considered as causally related in 
the context of adverse event reporting. 
The relationship to study procedures (eg, invasive procedures such as venipuncture or biopsy) 
should be assessed using the following considerations:

No: Evidence exists that the adverse event has an etiology other than the study procedure.

Yes: The adverse event occurred as a result of protocol procedures (eg., venipuncture)
7.2.2.
Assessment of Severity
The severity grading of AEs will be assessed as Grade 1, 2, 3, 4 or 5 according to the 
Common Terminology Criteria for Adverse Events (CTCAE) Version 4.03, which can be found 
at http://evs.nci.nih.gov/ftp1/CTCAE/CTCAE_4.03_2010-06-14_QuickReference_8.5x11.pdf
(Appendix 3).
For AEs associated with laboratory abnormalities, the event should be graded on the basis of the 
clinical severity in the context of the underlying conditions; this may or may not be in agreement 
with the grading of the laboratory abnormality.
The distinction between the seriousness and the severity of an adverse event should be noted. 
Severe is a measure of intensity; thus, a severe reaction is not necessarily a serious reaction. For 
example, a headache may be severe in intensity, but would not be classified as serious unless it 
met one of the criteria for serious events listed above.
7.3.
Investigator Requirements and Instructions for Reporting Adverse Events 
and Serious Adverse Events to Gilead
Requirements for collection prior to study drug initiation:
After informed consent, but prior to initiation of study medication, the following types of events 
should be reported on the case report form (eCRF): all SAEs and adverse events related to 
protocol-mandated procedures.
Adverse Events
Following initiation of study medication, collect all AEs, regardless of cause or relationship, 
until 30 days after last administration of GS-9674; AEs must be reported to the eCRF database as 
instructed.
All AEs should be followed up until resolution or until the adverse event is stable, if possible. 
Gilead Sciences may request that certain AEs be followed beyond the protocol defined follow up 
period.

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Serious Adverse Events
All SAEs, regardless of cause or relationship, that occurs after the subject first consents to 
participate in the study (ie, signing the informed consent) and throughout the duration of the 
study, including the protocol-required post treatment follow-up period, must be reported to the 
eCRF database and Gilead Drug Safety and Public Health (DSPH) as instructed. This also 
includes any SAEs resulting from protocol-associated procedures performed after informed 
consent is signed.
Any SAEs and deaths that occur after the post treatment follow-up visit and within 30 days of 
the last dose of study drug, regardless of causality, should also be reported. 
Investigators are not obligated to actively seek SAEs after the protocol defined follow up period; 
however, if the investigator learns of any SAEs that occur after study participation has concluded 
and the event is deemed relevant to the use of IMP, he/she should promptly document and report 
the event to Gilead DSPH.

All AEs and SAEs will be recorded in the eCRF database within the timelines outlined in the 
eCRF completion guideline. 
Electronic Serious Adverse Event (eSAE) Reporting Process

Site personnel record all SAE data in the eCRF database and from there transmit the SAE 
information to Gilead DSPH within 24 hours of the investigator’s knowledge of the event. 
Detailed instructions can be found in the eCRF completion guidelines.

If for any reason it is not possible to record the SAE information electronically, ie, the eCRF 
database is not functioning, record the SAE on the paper serious adverse event reporting 
form and submit within 24 hours to:
Gilead DSPH
Email:
Safety_FC@gilead.com
Fax:
+1 650-522-5477

As soon as it is possible to do so, any SAE reported via paper must be transcribed into the 
eCRF Database according to instructions in the eCRF completion guidelines.

If an SAE has been reported via a paper form because the eCRF database has been locked, no 
further action is necessary.

For fatal or life-threatening events, copies of hospital case reports, autopsy reports, and other 
documents are also to be submitted by e-mail or fax when requested and applicable. 
Transmission of such documents should occur without personal subject identification, 
maintaining the traceability of a document to the subject identifiers.

Additional information may be requested to ensure the timely completion of accurate safety 
reports.

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
Any medications necessary for treatment of the SAE must be recorded onto the concomitant 
medication section of the subject’s eCRF and the event description section of the SAE form.
7.4.
Gilead Reporting Requirements
Depending on relevant local legislation or regulations, including the applicable US FDA Code of 
Federal Regulations, the EU Clinical Trials Directive (2001/20/EC) and relevant updates, and 
other country-specific legislation or regulations, Gilead may be required to expedite to 
worldwide regulatory agencies reports of SAEs, serious adverse drug reactions (SADRs), or 
suspected unexpected serious adverse reactions (SUSARs). In accordance with the EU Clinical 
Trials Directive (2001/20/EC), Gilead or a specified designee will notify worldwide regulatory 
agencies and the relevant IEC in concerned Member States of applicable SUSARs as outlined in 
current regulations.
Assessment of expectedness for SAEs will be determined by Gilead using reference safety 
information specified in the investigator’s brochure or relevant local label as applicable. 
All investigators will receive a safety letter notifying them of relevant SUSAR reports associated 
with any study drug. The investigator should notify the IRB or IEC of SUSAR reports as soon as 
is practical, where this is required by local regulatory agencies, and in accordance with the local 
institutional policy.
To minimize the possibility of exposing study subjects to unusual risk, the safety information 
from this study will also be reviewed periodically by an independent Data Monitoring 
Committee (DMC). The DMC may have access to partially blinded or unblinded data and will 
make recommendations regarding the study according to the DMC charter. See Section 8.12 for
additional details regarding the DMC.
7.5.
Toxicity Management 
7.5.1.
PSC Specific Study Stopping Rule:
Any subject without a history of IBD, who develops new onset IBD while participating in the 
study, must be discontinued from the study. Any subject with a history of IBD who experiences 
at least a 3-point increase in the partial Mayo score while in the study must be discontinued from 
the study.
7.5.2.
Observation for Drug Induced Liver Injury (DILI):
Although subjects randomized in this study will have baseline liver disease, their hepatic 
function should not be significantly impaired. However, at baseline, some may have liver 
biochemistry levels above the upper limit of normal (ULN). 

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For subjects with ALT and AST below ULN at study start, close observation for DILI (as 
described below) should be considered in subjects with any of the following criteria (all labs 
confirmed by repeat testing):

ALT or AST > 3 x ULN 

Total bilirubin > 2 x ULN

Alkaline phosphatase > 3 x ULN

INR >1.5 x ULN (except for subjects on anticoagulant therapy)  

Clinical signs or symptoms that are, in the opinion of the investigator, consistent with 
hepatitis (such as right upper quadrant discomfort, fever, nausea, vomiting, jaundice, rash, or 
eosinophilia > 5%)
For subjects with ALT or AST between 1 and 5 x ULN at study start, close observation for DILI 
(as described below) should be considered in subjects with any of the following criteria (all labs 
confirmed by repeat testing):

ALT or AST > 2 x baseline at any time

Total bilirubin > 2 x ULN  

Alkaline phosphatase > 3 x ULN

INR >1.5 x ULN (except for subjects on anticoagulant therapy)  

Clinical signs or symptoms that are, in the opinion of the investigator, consistent with 
hepatitis (such as right upper quadrant discomfort, fever, nausea, vomiting, jaundice, rash, or 
eosinophilia > 5%).  
Close observation includes:

Repeating liver biochemistries (ALT, AST, ALP, total bilirubin, INR) within 48 hours

Obtaining a more detailed history of symptoms and prior or concurrent disease

Obtaining a history of concomitant drug use (including nonprescription medications and 
herbal and dietary supplement preparations), alcohol use, recreational drug use, and special 
diets

Obtaining a history of exposure to environmental chemical agents

Ruling out other causes of liver disease as needed (obtain viral hepatitis panel, imaging for 
evaluation of biliary tract disease, etc. if required in the opinion of the primary investigator)

Continue to monitor liver biochemistries twice weekly. Frequency can decrease to once a 
week or less if abnormalities stabilize or study drug has been discontinued and subject is 
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During a period of close observation, study drug can be continued, if desired, at the discretion of 
the Gilead Medical Monitor and the principal investigator during the DILI evaluation. 
However, for all subjects, study drug should be withheld if any of the following criteria are met:

ALT or AST > 3 x ULN AND either Total bilirubin > 2 x ULN or INR > 1.5 (in subjects not 
on anticoagulation)

ALT or AST > 3 x ULN AND the appearance of fatigue, nausea, vomiting, right upper 
quadrant pain or tenderness, fever, rash, and/or eosinophilia (>5%)

ALT or AST > 8 x ULN 

ALT or AST >5 x ULN for more than 2 weeks
AND

No other cause for the combination of laboratory abnormalities is immediately apparent (e.g. 
prolonged INR with warfarin use) important potential causes or contributors to abnormal 
AST/ALT or total bilirubin values include, but are not limited to:
— Obstructive gall bladder or bile duct disease
— Viral or alcoholic hepatitis (e.g. hepatitis A/B/C/D/E, Epstein-Barr virus, 
cytomegalovirus, herpes simplex virus, varicella)
— Autoimmune hepatitis
— Concomitant administration of other hepatotoxins, including excessive doses of 
acetaminophen, drugs that inhibit bilirubin glucuronidation (e.g. indinavir, atazanavir, 
irinotecan), or herbal or dietary supplements
— Hypoxic or ischemic hepatopathy or congestive hepatopathy in association with 
significant right-sided heart failure
— Wilson disease
— Nonalcoholic fatty liver disease (NAFLD)
— Progression of malignancy involving the liver (note that metastatic disease to the liver, by 
itself, should not be used as an explanation for significant AST/ALT elevations)
Treatment-emergent toxicities will be noted by the Investigator and brought to the attention of 
the Medical Monitor. Whether or not considered treatment-related, all subjects experiencing AEs 
must be monitored periodically until symptoms subside, any abnormal laboratory values have 
resolved or returned to baseline levels or they are considered irreversible, or until there is a 
satisfactory explanation for the changes observed.

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
Other than in the case of the liver enzymes noted above, Grade 3 or 4 clinically significant 
laboratory AEs should be confirmed by repeat testing as soon as practical to do so, and 
preferably within 3 calendar days of receipt of the original test results.

For AEs associated with laboratory abnormalities, the event should be graded on the basis of 
the clinical severity in the context of the underlying conditions; this may or may not be in 
agreement with the grading of the laboratory abnormality.

Any questions regarding toxicity management should be directed to the Medical Monitor.
7.6.
Special Situations Reports
7.6.1.
Definitions of Special Situations
Special situation reports include all reports of medication error, abuse, misuse, overdose, reports 
of AEs associated with product complaints, occupational exposure with an AE, pregnancy 
reports regardless of an associated AE, and AE in an infant following exposure from 
breastfeeding.  
Medication error is any unintentional error in the prescribing, dispensing, or administration of a 
medicinal product while in the control of the health care provider, subject, or consumer. 
Abuse is defined as persistent or sporadic intentional excessive use of a medicinal product by a 
subject.
Misuse is defined as any intentional and inappropriate use of a medicinal product that is not in 
accordance with the protocol instructions or the local prescribing information.
An overdose is defined as an accidental or intentional administration of a quantity of a medicinal 
product given per administration or cumulatively which is above the maximum recommended 
dose as per protocol or in the product labeling (as it applies to the daily dose of the subject in 
question). In cases of a discrepancy in drug accountability, overdose will be established only 
when it is clear that the subject has taken the excess dose(s). Overdose cannot be established 
when the subject cannot account for the discrepancy except in cases in which the investigator has 
reason to suspect that the subject has taken the additional dose(s).
Product complaint is defined as complaints arising from potential deviations in the manufacture, 
packaging, or distribution of the medicinal product.  
Occupational exposure with an AE: exposure to a medicinal product as a result of one’s 
professional or non-professional occupation.

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7.6.2.
Instructions for Reporting Special Situations
7.6.2.1.
Instructions for Reporting Pregnancies
The investigator should report pregnancies in female study subjects that are identified after 
initiation of study medication and throughout the study, including the post study drug follow-up 
period, to Gilead DSPH using the pregnancy report form within 24 hours of becoming aware of 
the pregnancy.
Refer to Section 7.3 and the eCRF completion guidelines for full instructions on the mechanism 
of pregnancy reporting.
The pregnancy itself is not considered an AE nor is an induced elective abortion to terminate a 
pregnancy without medical reasons.
Any premature termination of pregnancy (eg, a spontaneous abortion, an induced therapeutic 
abortion due to complications or other medical reasons) must be reported within 24 hours as an 
SAE. The underlying medical reason for this procedure should be recorded as the AE term.
A spontaneous abortion is always considered to be an SAE and will be reported as described in 
Sections 7.1.1 and 7.1.2. Furthermore, any SAE occurring as an adverse pregnancy outcome post 
study must be reported to Gilead DSPH.
The subject should receive appropriate monitoring and care until the conclusion of the 
pregnancy. The outcome should be reported to Gilead DSPH using the pregnancy outcome report 
form. If the end of the pregnancy occurs after the study has been completed, the outcome should 
be reported directly to Gilead DSPH. Gilead DSPH contact information is as follows: Email: 
Safety_FC@gilead.com and Fax: +1 (650) 522-5477. 
Pregnancies of female partners of male study subjects exposed to Gilead or other study drugs 
must also be reported and relevant information should be submitted to Gilead DSPH using the 
pregnancy and pregnancy outcome forms within 24 hours. Monitoring of the subject should 
continue until the conclusion of the pregnancy. If the end of the pregnancy occurs after the study 
has been completed, the outcome should be reported directly to Gilead DSPH, fax number +1 
650 522-5477 or email Safety_FC@gilead.com. 
Refer to Appendix 4 for Pregnancy Precautions, Definition for Female of Childbearing Potential, 
and Contraceptive Requirements.
7.6.2.2.
Reporting Other Special Situations
All other special situation reports must be reported on the special situations report form and 
forwarded to Gilead DSPH within 24 hours of the investigator becoming aware of the situation. 
These reports must consist of situations that involve study drug and/or Gilead concomitant 
medications, but do not apply to non-Gilead concomitant medications. 

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Special situations involving non-Gilead concomitant medications does not need to be reported on 
the special situations report form; however, for special situations that result in AEs due to a non-
Gilead concomitant medication, the AE should be reported on the AE form. 
Any inappropriate use of concomitant medications prohibited by this protocol should not be 
reported as “misuse,” but may be more appropriately documented as a protocol deviation.
Refer to Section 7.3 and the eCRF completion guidelines for full instructions on the mechanism 
of special situations reporting.
All clinical sequelae in relation to these special situation reports will be reported as AEs or SAEs 
at the same time using the AE eCRF and/or the SAE report form. Details of the symptoms and 
signs, clinical management, and outcome will be reported, when available.

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8. 
STATISTICAL CONSIDERATIONS 
Details will be provided in the Statistical Analysis Plan (SAP). 
8.1. 
Analysis Objectives and Endpoints 
8.1.1. 
Analysis Objectives 
The primary objective of this study is: 
• 
To evaluate the safety and tolerability of GS-9674 in subjects with PSC 
The exploratory objectives ofthis study are: 
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8.1.2. 
P1imary Endpoint 
-
Final 
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The primary endpoint is the safety of GS-9674 in subjects with PSC without cirrhosis. The safety 
and tolerability of GS-9674 will be evaluated by examining the incidence of treatment-emergent 
adverse events, including serious adverse events, clinical laboratory tests, and vital signs 
assessments at various time points during the study. 
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8.1.3. 
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8.2. 
8.2.1. 
8.2.1.1. 
Exploratory Endpoints 
Analysis Conventions 
Analysis Sets 
Efficacy 
Final 
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The primary analysis set for efficacy analysis will be the Full Analysis Set (F AS) which includes 
all subjects who were randomized into the study and received at least one dose of study drug. 
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Subjects who receive study drug other than that to which they were assigned will be analyzed 
according to the treatment group to which they were randomized. 
8.2.1.2. 
Safety 
The primary analysis set for safety analyses will include all subjects who received at least one 
dose of study drug. Treatment-emergent data will be analyzed and defined as data collected from 
the first dose of study drug through the date of last dose of study drug plus 30 days. Subjects 
who received study drug other than that to which they were assigned will be analyzed according 
to the study drug received. 
8.2.1.3. 
Pharmacokinetics 
There are two pharmacokinetic analysis sets: 1) the PK analysis set which includes 
concentration data from the s · 
drawn at each visit 
The PK analysis set will include all randomized subjects who took at least one dose of study 
drug and for whom concentration data of analytes GS-9674 (and its metabolites as applicable) 
are available. The PK analysis set will be used for analyses of population PK. 
PPD 
8.2.1.4. 
Pharmacodynamics 
There are two pharmacodynamics analysis sets: 1) The PD 
is set which includes 
concentration data from the s · 
drawn at each visit 
The PD analysis set will include all randomized subjects who took at least one dose of study 
drug and for whom concentration data ofFGF19, C4, and bile acids are available. The PD 
analysis set may be used for descriptive and/or population based PD analyses as applicable. 
PPD 
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8.2.1.5. 
Biomarkers 
Final 
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The Biomarker Analysis Set will include data from subjects in the Safety Analysis Set who have 
the necessary baseline and on-study measurements to provide interpretable results for the 
specific parameters of interest. 
8.2.2. 
Analysis by Study Phase 
Result of statistical analysis for the randomized phase will be presented by treatment groups. 
Safety data from the OLE Phase will be summarized for overall subjects who roll-over into the 
OLE Phase for safety review, supporting regulatory document update or publication purposes. 
An administrative interim analysis will be performed after first 30 subjects finish 12 weeks of 
treatment. 
8.3. 
Data Handling Conventions 
Missing data can have an impact on the interpretation of the trial data. In general, values for 
missing data will not be imputed. 
Where appropriate, safety data for subjects that did not complete the study will be included in 
summary statistics. For example, if a subject received study medication, the subject will be 
included in a summary of adverse events according to the treatment received; otherwise, if the 
subject is not dosed then they will be excluded from the summary. If safety laboratory results for 
a subject are missing for any reason at a time point, the subject will be excluded from the 
calculation of summary statistics for that time point. If the subject is missing a pre-dose value, 
then the subject will be excluded from the calculation of summary statistics for the pre-dose 
value and the change from pre-dose values. 
Values for missing safety laboratory data and vital signs will not be imputed; however, a missing 
baseline result will be replaced with a screening result, if available. If no pre-treatment 
laboratory value is available, the baseline value will be assumed to be normal (ie, no grade 
[Grade 0]) for the summary of graded laboratory abnormalities. 
8.4. 
Demographic Data and Baseline Characteristics 
Demographic and baseline measurements will be summarized using standard descriptive 
methods (n, mean, SD, median, Ql, Q3, minimum, and maximum) by treatment group and 
overall. Demographic summaries will include sex, race/ethnicity, and age. 
Baseline characteristics summary will include body weight, height, body mass index, and other 
disease characteristics. 
8.5. 
Efficacy Analysis 
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PPD 
8.6. 
Exploratory Analyses 
PPD 
8.7. 
Safety Analysis 
Final 
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All safety data collected on or after the date that GS-9674 was first dispensed up to the date of 
last dose of GS-9674 plus 30 days will be summarized by treatment group. Data for the 
pretreatment and follow-up periods will be included in data listings. 
8.7.1. 
Extent of Exposure 
Data for a subject's extent of exposure to GS-9674 will be generated from the study drug 
administration eCRF. Exposure data will be summarized by treatment group. 
8.7.2. 
Adverse Events 
Clinical and laboratory adverse events will be coded using the Medical Dictionary for 
Regulatory Activities (MedDRA). System Organ Class (SOC), High-Level Group Term 
(HLGT), High-Level Term (HLT), Preferred Term (PT), and Lower-Level Term (LLT) will be 
attached to the clinical database. Adverse event severity will be graded using the CTCAE 
Version 4. 03. 
Events will be summarized on the basis of the date of onset for the event. Treatment-emergent 
adverse events (TEAEs) are defined as 1 or both ofthe following: 
• 
Any AEs with an onset date on or after the study drug start date and no later than 30 days 
after permanent discontinuation of study drug 
• 
Any AEs leading to premature discontinuation of study drug 
Summaries (number and percentage of subjects) of TEAEs by SOC and PT will be provided. 
Treatment-emergent AEs will also be summarized by relationship to study drug and severity. In 
addition, TEAEs leading to premature discontinuation of study drug and study will be 
summarized and listed. 
All AEs collected during the course of the study will be presented in data listings with a field for 
treatment-emergent event (yes/no). 
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8.7.3. 
Laboratory Evaluations 
Final 
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Selected laboratory data will be summarized (n, mean, SD, Median, Q1, Q3, minimum, and 
maximum) by treatment group and study visit along with the corresponding change from 
baseline values. 
Graded laboratory abnormalities will be defined using the grading scheme in the CTCAE 
Version 4.03 (Appendix 3). Grading oflaboratory abnormalities for analysis purposes will be 
performed by the central laboratory. 
Incidence of treatment-emergent laboratory abnormalities, defined as values that increase at least 
1 toxicity grade from baseline at any time post baseline up to and including the date of last dose 
of study drug plus 30 days will be summarized by treatment group. If baseline data are missing, 
then any graded abnormality (ie, at least a Grade 1) will be considered treatment emergent. 
8.7.4. 
Other Safety Evaluations 
Vital sign measurements and 12-lead ECG data will be summarized by treatment group and 
listed by subject. 
8.8. 
Phannacokinetic Analysis 
Plasma concentrations and pharmacokinetic parameters (eg, AUCtau, Cmax and Ctau) will be 
listed and summarized as appropriate for GS-967 4 (and its metabolites as applicable) using 
descriptive statistics. 
Details ofthe analysis plan will be provided in the pharmacokinetic reporting and analysis plan. 
8.9. 
Pharmacodynamics Analysis 
Primary PD parameters (AUCpartiai, Cmax, Cmin as applicable) ofFGF19 and C4 will be listed and 
summarized as appropriate for GS-9674 using descriptive statistics. 
Details ofthe analysis plan will be provided in the pharmacodynamics reporting and analysis 
plan. 
8.10. 
Biomarker Analysis 
Descriptive statistics of biomarker expression and change from baseline will be provided at each 
sampling time by treatment. Point estimates and 95% confidence intervals may be calculated. 
PO 
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8.11.
Sample Size
Due to the exploratory nature of this study, no formal power calculations were used to determine 
sample size. The number of subjects was chosen based on clinical experience with other similar 
proof of concept studies.
8.12.
Data Monitoring Committee
An independent, external data monitoring committee (DMC) that consists of two hepatologists 
and a PhD statistician will review the progress of the study and perform reviews of safety data. 
The DMC will convene once 20 subjects have been randomized and will meet every 3 to 4 
months thereafter to monitor the study for safety events in Blinded Study Phase and every 6 
month in the OLE Phase. The DMC will meet on an ad hoc basis if there are at least 3 similar 
Grade ≥ 3 serious, treatment related Common Terminology Criteria for Adverse Events 
(CTCAE) observed in the trial. In the event of two similar treatment-related Grade 4 CTCAE 
events or one treatment-related Grade 5 CTCAE, the DMC will review the data and advise the 
sponsor regarding stopping or continuing the trial. The DMC will provide recommendation to 
Gilead whether the nature, frequency, and severity of adverse effects associated with study 
treatment warrant the early termination of the study in the best interests of the participants, 
whether the study should continue as planned, or the study should continue with modifications. 
The DMC may also provide recommendations as needed regarding study design.
The DMC’s specific activities will be defined by a mutually agreed charter, which will define the 
DMC’s membership, conduct and meeting schedule.
While the DMC will be asked to advise Gilead regarding future conduct of the study, including 
possible early study termination, Gilead retains final decision-making authority on all aspects of 
the study.

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9.
RESPONSIBILITIES
9.1.
Investigator Responsibilities
9.1.1.
Good Clinical Practice
The investigator will ensure that this study is conducted in accordance with the principles of the 
Declaration of Helsinki, International Conference on Harmonisation (ICH) guidelines, or with 
the laws and regulations of the country in which the research is conducted, whichever affords the 
greater protection to the study subject. These standards are consistent with the European Union 
Clinical Trials Directive 2001/20/EC and Good Clinical Practice Directive 2005/28/EC.
The investigator will ensure adherence to the basic principles of Good Clinical Practice, as 
outlined in 21 CFR 312, subpart D, “Responsibilities of Sponsors and Investigators,” 21 CFR, 
part 50, 1998, and 21 CFR, part 56, 1998.
The investigator and all applicable subinvestigators will comply with 21 CFR, Part 54, 1998, 
providing documentation of their financial interest or arrangements with Gilead, or proprietary 
interests in the investigational drug under study. This documentation must be provided prior to 
the investigator’s (and any subinvestigator’s) participation in the study. The investigator and 
subinvestigator agree to notify Gilead of any change in reportable interests during the study and 
for 1 year following completion of the study. Study completion is defined as the date when the 
last subject completes the protocol-defined activities.
9.1.2.
Institutional Review Board (IRB)/Independent Ethics Committee (IEC) 
Review and Approval
The investigator (or sponsor as appropriate according to local regulations) will submit this 
protocol, informed consent form, and any accompanying material to be provided to the subject 
(such as advertisements, subject information sheets, or descriptions of the study used to obtain 
informed consent) to an IRB/IEC/EC. The investigator will not begin any study subject activities 
until approval from the IRB/IEC/EC has been documented and provided as a letter to the 
investigator.
Before implementation, the investigator will submit to and receive documented approval from 
the IRB/IEC/EC any modifications made to the protocol or any accompanying material to be 
provided to the subject after initial IRB/IEC/EC approval, with the exception of those necessary 
to reduce immediate risk to study subjects.
9.1.3.
Informed Consent
The investigator is responsible for obtaining written informed consent from each individual 
participating in this study after adequate explanation of the aims, methods, objectives, and 
potential hazards of the study and before undertaking any study-related procedures. The 
investigator must use the most current IRB/IEC/EC -approved consent form for documenting 

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written informed consent. Each informed consent (or assent as applicable) will be appropriately 
signed and dated by the subject or the subject’s legally authorized representative and the person 
conducting the consent discussion, and also by an impartial witness if required by IRB/IEC/EC
local requirements.
9.1.4.
Confidentiality
The investigator must assure that subjects’ anonymity will be strictly maintained and that their 
identities are protected from unauthorized parties. Only subject initials, date of birth, another 
unique identifier (as allowed by local law) and an identification code will be recorded on any 
form or biological sample submitted to the Sponsor, IRB/IEC/EC, or laboratory. Laboratory 
specimens must be labeled in such a way as to protect subject identity while allowing the results 
to be recorded to the proper subject. NOTE: The investigator must keep a screening log showing 
codes, names, and addresses for all subjects screened and for all subjects randomized in the trial.
Subject data will be processed in accordance with all applicable regulations. 
The investigator agrees that all information received from Gilead, including but not limited to the 
investigator brochure, this protocol, eCRF, the study drug, and any other study information, 
remain the sole and exclusive property of Gilead during the conduct of the study and thereafter. 
This information is not to be disclosed to any third party (except employees or agents directly 
involved in the conduct of the study or as required by law) without prior written consent from 
Gilead. The investigator further agrees to take all reasonable precautions to prevent the 
disclosure by any employee or agent of the study site to any third party or otherwise into the 
public domain.
9.1.5.
Study Files and Retention of Records
The investigator must maintain adequate and accurate records to enable the conduct of the study 
to be fully documented and the study data to be subsequently verified. These documents should 
be classified into at least the following two categories: (1) investigator’s study file, and 
(2) subject clinical source documents.
The investigator’s study file will contain the protocol/amendments, CRF and query forms
IRB/IEC and governmental approval with correspondence, informed consent, drug records, staff 
curriculum vitae and authorization forms, and other appropriate documents and correspondence.
The required source data should include sequential notes containing at least the following 
information for each subject:

Subject identification (name, date of birth, gender);

Documentation that subject meets eligibility criteria, ie, history, physical examination, and 
confirmation of diagnosis (to support inclusion and exclusion criteria);

Documentation of the reason(s) a consented subject is not randomized;

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
Participation in study (including study number);

Study discussed and date of informed consent;

Dates of all visits;

Documentation that protocol specific procedures were performed;

Results of efficacy parameters, as required by the protocol;

Start and end date (including dose regimen) of study drug, including dates of dispensing and 
return;

Record of all adverse events and other safety parameters (start and end date, and including 
causality and severity);

Concomitant medication (including start and end date, dose if relevant; dose changes);

Date of study completion and reason for early discontinuation, if it occurs.
All clinical study documents must be retained by the investigator until at least 2 years or 
according to local laws, whichever is longer, after the last approval of a marketing application in 
an ICH region (ie, United States, Europe, or Japan) and until there are no pending or planned 
marketing applications in an ICH region; or, if no application is filed or if the application is not 
approved for such indication, until 2 years after the investigation is discontinued and regulatory 
authorities have been notified. Investigators may be required to retain documents longer if 
specified by regulatory requirements, by local regulations, or by an agreement with Gilead. The 
investigator must notify Gilead before destroying any clinical study records.
Should the investigator wish to assign the study records to another party or move them to another 
location, Gilead must be notified in advance.
If the investigator cannot provide for this archiving requirement at the study site for any or all of 
the documents, special arrangements must be made between the investigator and Gilead to store 
these records securely away from the site so that they can be returned sealed to the investigator 
in case of an inspection. When source documents are required for the continued care of the 
subject, appropriate copies should be made for storage away from the site.
9.1.6.
Case Report Forms
For each subject consented, an electronic case report form (eCRF) will be completed by an 
authorized study staff member whose training for this function is documented according to study 
procedures. eCRF should be completed on the day of the subject visit to enable the sponsor to 
perform central monitoring of safety data.  The Eligibility Criteria eCRF should be completed 
only after all data related to eligibility have been received.  Subsequent to data entry, a study 
monitor will perform source data verification within the EDC system. Original entries as well as 

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any changes to data fields will be stored in the audit trail of the system.  Prior to database lock 
(or any interim time points as described in the clinical data management plan), the investigator 
will use his/her log in credentials to confirm that the forms have been reviewed, and that the 
entries accurately reflect the information in the source documents. The eCRF capture the data 
required per the protocol schedule of events and procedures. System-generated or manual 
queries will be issued to the investigative site staff as data discrepancies are identified by the 
monitor or internal Gilead staff, who routinely review the data for completeness, correctness, and 
consistency. The site coordinator is responsible for responding to the queries in a timely manner, 
within the system, either by confirming the data as correct or updating the original entry, and 
providing the reason for the update (e.g. data entry error). At the conclusion of the trial, Gilead 
will provide the site with a read-only archive copy of the data entered by that site. This archive 
must be stored in accordance with the records retention requirements outlined in Section 9.1.5.
9.1.7.
Investigational Medicinal Product Accountability and Return
Where possible, study drug should be destroyed at the site. If the site does not have acceptable 
procedures in place for drug destruction, arrangements will be made between the site and 
Gilead Sciences (or Gilead Sciences’ representative) for return of unused study drug supplies. 
The study monitor will provide instructions for return.
The study monitor will evaluate each study center’s study drug disposal procedures and provide 
appropriate instruction for destruction of unused study drug supplies. If the site has an 
appropriate standard operating procedure (SOP) for drug destruction as determined by Gilead 
QA, the site may destroy used (empty or partially empty) and unused study drug supplies in 
accordance with that site’s approved SOP. A copy of the site’s approved SOP will be obtained 
for central files. 
If study drug is destroyed on site, the investigator must maintain accurate records for all study 
drug destroyed. Records must show the identification and quantity of each unit destroyed, the 
method of destruction, and the person who disposed of the study drug. Upon study completion, 
copies of the study drug accountability records must be filed at the site. Another copy will be 
returned to Gilead. Refer to the pharmacy binder for study drug disposal/return instructions.
The study monitor will review study drug supplies and associated records at periodic intervals.
9.1.8.
Inspections
The investigator will make available all source documents and other records for this trial to 
Gilead’s appointed study monitors to the IRB/IEC/EC, or to regulatory authority or health 
authority inspectors.
9.1.9.
Protocol Compliance
The investigator is responsible for ensuring the study is conducted in accordance with the 
procedures and evaluations described in this protocol.

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9.2.
Sponsor Responsibilities
9.2.1.
Protocol Modifications
Protocol modifications, except those intended to reduce immediate risk to study subjects, may be 
made only by Gilead. The investigator must submit all protocol modifications to the IRB/IEC in 
accordance with local requirements and receive documented IRB/IEC/EC approval before 
modifications can be implemented.
9.2.2.
Study Report and Publications
A clinical study report (CSR) will be prepared and provided to the regulatory agencies. Gilead 
will ensure that the report meets the standards set out in the ICH Guideline for Structure and 
Content of Clinical Study Reports (ICH E3). Note that an abbreviated report may be prepared in 
certain cases.
Investigators in this study may communicate, orally present, or publish in scientific journals or 
other scholarly media only after the following conditions have been met: the results of the study 
in their entirety have been publicly disclosed by or with the consent of Gilead in an abstract, 
manuscript, or presentation form or the study has been completed at all study sites for at least 2 
years.
The investigator will submit to Gilead any proposed publication or presentation along with the 
respective scientific journal or presentation forum at least 30 days before submission of the 
publication or presentation. 
No such communication, presentation, or publication will include Gilead’s confidential 
information (see Section 9.1.4).
The investigator will comply with Gilead’s request to delete references to its confidential 
information (other than the study results) in any paper or presentation and agrees to withhold 
publication or presentation for an additional 60 days in order to obtain patent protection if 
deemed necessary.
9.3.
Joint Investigator/Sponsor Responsibilities
9.3.1.
Payment Reporting
Investigators and their study staff may be asked to provide services performed under this 
protocol, e.g. attendance at Investigator's Meetings.  If required under the applicable statutory 
and regulatory requirements, Gilead will capture and disclose to Federal and State agencies any 
expenses paid or reimbursed for such services, including any clinical trial payments, meal, travel 
expenses or reimbursements, consulting fees, and any other transfer of value.

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9.3.2.
Access to Information for Monitoring
In accordance with regulations and guidelines, the study monitor must have direct access to the 
investigator’s source documentation in order to verify the accuracy of the data recorded in the 
eCRF.
The monitor is responsible for routine review of the eCRF at regular intervals throughout the 
study to verify adherence to the protocol and the completeness, consistency, and accuracy of the 
data being entered on them. The monitor should have access to any subject records needed to 
verify the entries on the eCRF. The investigator agrees to cooperate with the monitor to ensure 
that any problems detected through any type of monitoring (central, on site) are resolved.
9.3.3.
Access to Information for Auditing or Inspections
Representatives of regulatory authorities or of Gilead may conduct inspections or audits of the 
clinical study. If the investigator is notified of an inspection by a regulatory authority the 
investigator agrees to notify the Gilead medical monitor immediately. The investigator agrees to 
provide to representatives of a regulatory agency or Gilead access to records, facilities, and 
personnel for the effective conduct of any inspection or audit.
9.3.4.
Study Discontinuation
Both the sponsor and the investigator reserve the right to terminate the study at any time. Should 
this be necessary, both parties will arrange discontinuation procedures and notify the appropriate 
regulatory authorities, IRBs/ IECs/ECs. In terminating the study, Gilead and the investigator will 
assure that adequate consideration is given to the protection of the subjects’ interests.

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10.
REFERENCES
Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine. Nephron 
1976;16:31-41.
Graziadei IW, Wiesner RH, Marotta PJ, Porayko MK, Hay JE, Charlton MR, et al. Long-term 
results of patients undergoing liver transplantation for primary sclerosing 
cholangitis. Hepatology 1999;30 (5):1121-7.
Inagaki T, Choi M, Moschetta A, Peng L, Cummins CL, McDonald JG, et al. Fibroblast growth 
factor 15 functions as an enterohepatic signal to regulate bile acid homeostasis. 
Cell metabolism 2005;2 (4):217-25.
Karlsen TH, Franke A, Melum E, Kaser A, Hov JR, Balschun T, et al. Genome-wide association 
analysis in primary sclerosing cholangitis. Gastroenterology 2010;138 (3):1102-
11.
Kornfeld D, Ekbom A, Ihre T. Survival and risk of cholangiocarcinoma in patients with primary 
sclerosing cholangitis. A population-based study. Scand J Gastroenterol 1997;32 
(10):1042-5.
Lindor KD, Kowdley KV, Harrison ME, American College of G. ACG Clinical Guideline: 
Primary Sclerosing Cholangitis. Am J Gastroenterol 2015;110 (5):646-59; quiz 
60.
Molodecky NA, Kareemi H, Parab R, Barkema HW, Quan H, Myers RP, et al. Incidence of 
primary sclerosing cholangitis: a systematic review and meta-analysis. 
Hepatology 2011;53 (5):1590-9.
Mudaliar S, Henry RR, Sanyal AJ, Morrow L, Marschall HU, Kipnes M, et al. Efficacy and 
safety of the farnesoid X receptor agonist obeticholic acid in patients with type 2 
diabetes and nonalcoholic fatty liver disease. Gastroenterology 2013;145 (3):574-
82 e1.
Murakami S, Takayama F, Egashira T, Imao M, Mori A. Fermented papaya preparation halts the 
progression of non-alcoholic steatohepatitis in rats. Journal of Biophysical 
Chemisty 2013;4 (2):84-90.
Nakamoto K, Takayama F, Mankura M, Hidaka Y, Egashira T, Ogino T, et al. Beneficial Effects 
of Fermented Green Tea Extract in a Rat Model of Non-alcoholic Steatohepatitis. 
Journal of clinical biochemistry and nutrition 2009;44 (3):239-46.
Pellicciari R, Fiorucci S, Camaioni E, Clerici C, Costantino G, Maloney PR, et al. 6alpha-ethyl-
chenodeoxycholic acid (6-ECDCA), a potent and selective FXR agonist endowed 
with anticholestatic activity. J Med Chem 2002;45 (17):3569-72.

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Saich R, Chapman R. Primary sclerosing cholangitis, autoimmune hepatitis and overlap 
syndromes in inflammatory bowel disease. World J Gastroenterol 2008;14 
(3):331-7.
Triantos CK, Koukias NM, Nikolopoulou VN, Burroughs AK. Meta-analysis: ursodeoxycholic 
acid for primary sclerosing cholangitis. Aliment Pharmacol Ther 2011;34 (8):901-
10.

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11.
APPENDICES
Appendix 1.
Investigator Signature Page
Appendix 2.
Study Procedures Table for GS-US-428-4025
Appendix 3.
GSI Grading Scale for Severity of Adverse Events and Laboratory Abnormalities
Appendix 4.
Pregnancy Precautions, Definition for Female of Childbearing Potential, and 
Contraceptive Requirements

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Appendix 1. 
Investigator Signature Page 
GILEAD SCIENCES, INC. 
333 LAKESIDE DRIVE 
FOSTER CITY, CA 94404, 
U.S.A. 
STUDY ACKNOWLEDGEMENT 
A Phase 2, Randomiz..ed, Double-Blind, Placebo Controlled Study Evaluating the Safety, 
Tolerability, and Efficacy ofOS-9674 in Subjects with Primary Sclerosing Cholangitis Without 
Cirrhosis 
GS-US-428-4025, Original, 29-June-2016 
This protocol has been approved by Gilead Sciences, Inc. The following signature documents 
this approval. 
C. Stephen Djedjos (Printed) 
Medical Monitor 
Date 
PPD 
' 
Signature 
~STIGATORSTATEMENT 
I have read the protocol, including all appendices, and I agree that it contains all necessary 
details for me and my staff to conduct this study as described. I will conduct this study as 
outlined herein and will make a reasonable effort to complete the study within the time 
designated. 
I wi U provide all study personnel under my supervision copies of the protocol and access to all 
information provided by Gilead Sciences, Inc. I will discuss this material with them to ensure 
that they are fully informed about the drugs and the study. 
Principal Investigator Name (Printed) 
Signature 
Date 
Site Number 
CONFIDENTIAL 
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Appendix 2.
Study Procedures Table for GS-US-428-4025
Blinded Study Phase Treatment Weeks (±3 days)
OLE Weeks 
(±5 days)
Screening a
Baseline
(Day 1)
Week 1
Week 2
Week 4
Week 8
Week 12 /ET b
Blinded Study Phase 
follow-up visit c
(±5 days)
OLE 
Baseline/Day 1, 
Weeks 4, 12, 24, 
36, 48, 60, 72, 84,  
96/ET b
OLE 
follow-up d
Subject Fasting e
X
X
X
X
X
X
X
Written Informed 
Consent f
X
Review 
Inclusion/Exclusion 
Criteria
X
X
Medical History
X
Partial Mayo Score
X
X
X
X
X
X
X
X
X
X
Pruritus VAS &5D-
Itch g
X
X
X
X
X
X
X
X
X
QoL SF-36, PSC-
PRO & PBC-40g
X
X
X
X
Symptom-directed 
PEh
X
X
X
X
X
X
X
X
X
X
Vital Signsi
X
X
X
X
X
X
X
X
X
X
Height and weightj
X
X
X
X
X
X
X
X
X
X
Chemistryk
X
X
X
X
X
X
X
X
X
X
Hematology l
X
X
X
X
X
X
X
X
X
X

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Screening• 
Coagulation Panel m 
X 
Cirrhosis 
X 
Assessments 
Lipid Profile 
C-Peptide, 
Hemoglobin A1C 
and Insulin 
Blood for 
X 
Biomarkers" 
Single PK and PD 
Sampling 
HIV-1, HBVand 
X 
HCV Serology 
Pregnancy T estP 
X 
Serum FSHq 
X 
f PD 
12- lead ECGs 
Fibroscan' 
CONFIDENTIAL 
Blinded Study Phase Treatment Weeks (±3 days) 
Baseline 
(Day 1) 
Week1 
Week2 
Week4 
Week8 
Week 12/ETb 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
xo 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
I : I 
I 
I 
I 
I 
X 
X 
Page 84 
Blinded Study Phase 
follow-up visit c 
(±5 days) 
X 
X 
X 
X 
Final 
Original 
OLE Weeks 
(±5 days) 
OLE 
Baseline/Day 1, 
Weeks 4, 12, 24, 
36, 48, 60, 72, 84, 
OLE 
96/ETb 
follow-upd 
X 
X 
X 
X 
X 
X 
X 
29 June 2016 
J 

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Screening• 
Urine drug 
X 
screening1 
Urine collection 
(Biomarkerst 
Stool collection 
(Biomarkers )v 
IPPD 
Dispense GS-9674/ 
PTM GS-9674x 
Concomitant 
X 
Medications 
Adverse Events 
X 
Take GS-9674/ PTM 
GS-9674 TabletsY 
Baseline 
(Day 1) 
X 
X 
X 
X 
X 
Blinded Study Phase Treatment Weeks (±3 days) 
Week1 
Week2 
Week4 
Week8 
Week 12/ETb 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X- Daily (Baseline/ Day 1 to Week 12) 
Blinded Study Phase 
follow-up visit c 
(±5 days) 
X 
X 
X 
X 
Final 
Original 
OLE Weeks 
(±5 days) 
OLE 
Baseline/Day 1, 
Weeks 4, 12, 24, 
36, 48, 60, 72, 84, 
OLE 
96/ETb 
follow-upd 
xx 
XY 
X 
X 
X 
X 
X 
X-Daily (OLE 
Baseline/ Day 1 
to Week 96) 
a 
The visit window may be extended under special circumstances with explicit approval of the Medical Monitor. Subjects who fail to meet eligibility criteria due to an abnormal 
laboratory result may undergo re-testing of the abnormal analyte during the screening window. This will be done at the discretion of the investigator and also with prior 
approval of the Medical Monitor. 
b 
Blinded Study Phase subjects discontinuing the study at any time for any reason (Early Termination- ET) should complete the procedures listed for the Week 12/ Visit AND 
the follow-up visit. OLE Phase subjects discontinuing the study at any time for any reason (Early Termination- ET) should complete the procedures listed for the Week 96/ 
Visit AND the follow-up visit if possible. 
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c 
After completing 12 weeks of treatment in the Blinded Study Phase, subjects will return for the follow-up visit 4 weeks post the last dose of the study drug and at that time 
they can begin their OLE Phase. Follow-up visit for Blinded Study Phase and Baseline/Day 1 OLE visit can occur on the same day if convenient. If OLE Baseline/Day 1 and 
Blinded study follow-Up visit is on the same day subjects should only complete OLE Baseline /Day 1 assessments. 
d 
Follow-up visit should be completed during the Blinded Study Phase as well as the OLE Phase. 
e 
Subjects must be in a fasted state for at least 8 hours prior to blood collection. 
f 
Obtain written informed consent before initiation of any screening procedure. 
g 
QoL questionnaires and Pruritus assessments should be completed prior to any study procedures being performed and prior to the subject seeing a health care provider. Refer 
to the Study Reference Binder for guidance on QoL questionnaire administration. 
h 
Complete PE at screening and symptom-directed PE for other visits. The focus of a symptom-driven physical examination will be determined by the investigator based on 
subject complaint. 
Vital signs include blood pressure, heart rate, respiration rate, and body temperature. 
Height should be collected at Screening and Baseline/Day 1 only. Weight should be collected at all visits. Refer to the Study Reference Binder for specific instructions on 
how weight should be measured. 
k 
Blood chemistry will include: alanine aminotransferase (ALT), aspartate aminotransferase (AST), albumin, alkaline phosphatase, bicarbonate, blood urea nitrogen (BUN), 
calcium, chloride, creatinine, glucose, lactate dehydrogenase (LDH), magnesium, phosphorus, potassium, sodium, total and direct bilirubin, total protein, uric acid, gamma-
glutamyl transferase (GGT). Also includes C-Peptide, insulin and hemoglobin A1C (HbA1c) for the Baseline/Day 1, and Week 12 visits. 
Hematology will include: complete blood cell count with differential (red blood cells, white blood cells, platelets, and hematocrit). 
m 
Coagulation Panel includes: PT, PTT, and INR. 
n 
Biomarker analyses include, but are not limited to, the tests listed in Section 6.12.1. Some of the blood collected for biomarkers may be stored for future testing. 
o 
PD sampling only at Baseline/Day 1. 
p 
Females of childbearing potential only (see Appendix 4). Serum pregnancy tests at Screening. Urine pregnancy test at all other visits, except Week 2 and 8. 
q 
OnlY..!!_quired for some female subjects- see AP£"'e•n.-di.,·x;..4.;.;. _______________________________ ---. 
rro 
-
s 
1s not available at a site the test may be 
Drug screen for amphetamines, cocaine, and opiates (ie, heroin, morphine). 
u 
Urine Biomarker sample collection at OLE Baseline/Day 1, Weeks 24, 48, 72 and 96 only. 
v 
Stool sample collection only at OLE Baseline/Day 1, Week 48 and Week 96 visit. 
PD 
x 
Stuay aiUg Will be ass1gnea via ffie IWRS system every 4 weeks from Baseline/Day 1 through Week 8 in Blind Study Phase and OLE Baseline/Bay 1 and every 12 weeks 
thereafter in the OLE Phase. 
y 
Subjects to self-administer the study drug at the investigative site at the conclusion of the Baseline/Day 1 and Week 12 visit. 
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Appendix 3.
GSI Grading Scale for Severity of Adverse Events and Laboratory 
Abnormalities
http://evs.nci.nih.gov/ftp1/CTCAE/CTCAE_4.03_2010-06-14_QuickReference_8.5x11.pdf

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Appendix 4.
Pregnancy Precautions, Definition for Female of Childbearing 
Potential, and Contraceptive Requirements
1. Definitions
a. Definition of Childbearing Potential
For the purposes of this study, a female born subject is considered of childbearing potential 
following the initiation of puberty (Tanner stage 2) until becoming post-menopausal, unless 
permanently sterile or with medically documented ovarian failure.  
Women are considered to be in a postmenopausal state when they are > 54 years of age with 
cessation of previously occurring menses for > 12 months without an alternative cause.  In 
addition, women of any age with amenorrhea of > 12 months may also be considered 
postmenopausal if their follicle stimulating hormone (FSH) level is in the postmenopausal range 
and they are not using hormonal contraception or hormonal replacement therapy.
Permanent sterilization includes hysterectomy, bilateral oophorectomy, or bilateral 
salpingectomy in a female subject of any age.
b. Definition of Male Fertility
For the purposes of this study, a male born subject is considered of fertile after the initiation of 
puberty unless permanently sterile by bilateral orchidectomy or medical documentation.
2. Contraception Requirements for Female Subjects
a. Study Drug Effects on Pregnancy and Hormonal Contraception
GS-9674 has not yet been studied in pregnant women. There are no preclinical data available to 
determine whether GS-9674 is teratogenic or fetotoxic in early human pregnancy. There are 
insufficient data to exclude the possibility of a clinically relevant interaction between GS-9674 
and hormonal contraceptives that result in reduced contraception efficacy. 
Please refer to the latest version of the investigator’s brochure for additional information.
b. Contraception Requirements for Female Subjects of Childbearing Potential
The inclusion of female subjects of childbearing potential requires the use of highly effective 
contraceptive measures. They must also not rely on hormone-containing contraceptives as a form 
of birth control during the study. They must have a negative serum pregnancy test at Screening 
and a negative urine pregnancy test on the Baseline/Day 1 visit prior to randomization.  At 
minimum, a pregnancy test will be performed at the end of relevant system exposure.  In the 
event of a delayed menstrual period (over one month between menstruations), a pregnancy test 
must be performed to rule out pregnancy.  This is even true for women of childbearing potential 
with infrequent or irregular periods. Female subjects must agree to one of the following from 
Screening until 30 days following the lase dose of the study drug GS-9674.

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
Complete abstinence from intercourse of reproductive potential.  Abstinence is an acceptable 
method of contraception only when it is in line with the subject’s preferred and usual 
lifestyle. 
Or

Consistent and correct use of 1 of the following methods of birth control listed below. 
Intrauterine device (IUD) with a failure rate of <1% per year
Tubal sterilization
Essure micro-insert system (provided confirmation of success 3 months after procedure)
Vasectomy in the male partner (provided that the partner is the sole sexual partner and 
had confirmation of surgical success 3 months after procedure)
Female subjects must also refrain from egg donation and in vitro fertilization during treatment 
and until at least 30 days after the lase dose of the study drug GS-9674.
3. Contraception Requirements for Male Subjects
It is theoretically possible that a relevant systemic concentration may be achieved in a female 
partner from exposure of the male subject’s seminal fluid.  Therefore, male subjects with female 
partners of childbearing potential must use condoms during treatment and for 90 days after last 
dose of GS-9674. Additional contraception recommendations should also be considered if the 
female partner is not pregnant.
Male subjects must agree to avoid sperm donation from baseline throughout the study period and 
for 90 days after last dose of GS-9674.
4. Unacceptable Birth Control Methods
Birth control methods that are unacceptable include periodic abstinence (e.g., calendar, 
ovulation, symptothermal, post-ovulation methods), withdrawal (coitus interruptus), spermicides 
only, and lactational amenorrhea method (LAM).  Female condom and male condom should not 
be used together.

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5. Procedures to be Followed in the Event of Pregnancy
Subjects will be instructed to notify the investigator if they become pregnant at any time during 
the study, or if they become pregnant within 30 days (90 days of partner of male subject) of last 
study drug dose. Subjects who become pregnant or who suspect that they are pregnant during the 
study must report the information to the investigator and discontinue study drug immediately. 
Subjects whose partner has become pregnant or suspects she is pregnant during the study must 
report the information to the investigator.  Instructions for reporting pregnancy, partner 
pregnancy, and pregnancy outcome are outlined in Section 7.6.2.1.