Conditions: Chronic Thromboembolic Pulmonary Hypertension CTEPH
Keywords: Pulmonary endarterectomy PEA Medical therapy
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 14
Healthy volunteers: no

Brief summary:
This is a randomised, double-blind, placebo-controlled, multicentre, multinational, prospective study in patients with operable chronic thromboembolic pulmonary hypertension (CTEPH) prior to pulmonary endarterectomy (PEA) with high preoperative pulmonary vascular resistance (PVR). Patients will be randomised in a 1:1 ratio to receive riociguat or matching placebo for 3 months before undergoing PEA. The primary objective of this study is to assess the efficacy of riociguat on preoperative PVR compared to placebo in patients with operable CTEPH.

Detailed description:

Arms:
arm 1: Patients will receive riociguat for 3 months followed by pulmonary endarterectomy. arm 2: Patients will receive placebo for 3 months followed by pulmonary endarterectomy.

Interventions: intervention 1: Riociguat intervention 2: Placebo intervention 3: Pulmonary endarterectomy
Intervention descriptions: intervention 1: Riociguat will be initiated at 1 mg tid. The dosage will be increased by 0.5 mg at 2 week intervals based on tolerability as assessed by systolic blood pressure up to a maximum dose of 2.5 mg tid.

Downtitration to 0.5 mg tid is foreseen for patients with low optimal tolerability. intervention 2: Placebo will be given analogue to riociguat with matching tablets. intervention 3: PEA will be performed at the end of medical treatment (Day 90)

Protocol document:
Prot_000.pdf: 
 
 
 
International CTEPH Association (ICA) 
 
 
PEA Bridging Study 
 
 
A Phase 2, Randomised, Double-Blind, Placebo-Controlled, Multicentre, 
Prospective Study to Assess Efficacy of Riociguat in Patients With 
Operable CTEPH Prior to Pulmonary Endarterectomy With High 
Preoperative Pulmonary Vascular Resistance 
 
 
NCT03273257 
 
 
Protocol 
 
Version 3.0, Amendment 2 
 
26APR2018 
 













































































































































































SAP_001.pdf: 
 
Confidential 
 
 
 
International CTEPH Association (ICA) 
 
 
PEA Bridging Study 
 
 
A Phase 2, Randomised, Double-Blind, Placebo-Controlled, Multicentre, 
Prospective Study to Assess Efficacy of Riociguat in Patients With Operable 
CTEPH Prior to Pulmonary Endarterectomy With High Preoperative 
Pulmonary Vascular Resistance 
 
 
NCT03273257 
 
 
Statistical Analysis Plan 
 
Version 1.0, Amendment 1.0 
 
14DEC2020 
 
 
 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 II
 
 
 
 
 
 
International CTEPH Association (ICA) 
 
PEA Bridging Study 
 
A Phase 2, Randomised, Double-Blind, Placebo-Controlled, Multicentre, 
Prospective Study to Assess Efficacy of Riociguat in Patients With Operable 
CTEPH Prior to Pulmonary Endarterectomy With High Preoperative 
Pulmonary Vascular Resistance 
 
14DEC2020 
 
Statistical Analysis Plan 
 
Version 1.0, Amendment 1.0 
 
Prepared by: 
 
PPD 
929 North Front Street 
Wilmington, NC 28401 
 
 
Issued by: 
____________________________  
Date: ___/___/___ 
 
 
Hebing Wang 
 
 
Biostatistician II, Biostatistics  
PPD 
 
Reviewed by: ____________________________  
Date: ___/___/___ 
 
 
Stacey  Ouyang 
 
 
 
Biostatistics Team Leader, Biostatistics 
 
 
 
PPD 
 
Upon review of this document, including table, listing, and figure shells, the undersigned 
approves the statistical analysis plan. The analysis methods and data presentation are acceptable, 
and the table, listing, and figure production can begin. 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  III 
 
 
Approved by: ____________________________  
Date: ___/___/___ 
 
 
 
Gérald Simonneau, Ph.D. 
Chairman of the ICA 
International CTEPH Association 
 
 
____________________________  
Date: ___/___/___ 
 
 
 
David Jenkins, MD 
 
 
 
Principal Investigator 
International CTEPH Association 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  IV 
TABLE OF CONTENTS 
LIST OF ABBREVIATIONS .................................................................................................... VI 
1. 
INTRODUCTION ............................................................................................................ 1 
2. 
OBJECTIVES ................................................................................................................... 2 
2.1. PRIMARY OBJECTIVE .......................................................................................................... 2 
2.2. SECONDARY OBJECTIVES ................................................................................................... 2 
3. 
INVESTIGATIONAL PLAN .......................................................................................... 2 
3.1. OVERALL STUDY DESIGN AND PLAN .................................................................................. 2 
3.2. STUDY ENDPOINTS ............................................................................................................. 4 
3.2.1. 
Primary Efficacy Endpoint ......................................................................................... 4 
3.2.2. 
Secondary Efficacy Endpoints .................................................................................... 4 
3.2.3. 
Exploratory Efficacy Endpoints .................................................................................. 5 
3.2.4. 
Safety Endpoints.......................................................................................................... 6 
3.3. TREATMENTS ...................................................................................................................... 6 
3.4. DOSE ADJUSTMENT/MODIFICATIONS ................................................................................. 6 
4. 
GENERAL STATISTICAL CONSIDERATIONS ....................................................... 6 
4.1. SAMPLE SIZE ...................................................................................................................... 7 
4.2. RANDOMISATION, STRATIFICATION, AND BLINDING .......................................................... 7 
4.3. ANALYSIS SET .................................................................................................................... 8 
4.3.1. 
Intent-to-Treat (ITT) Set ............................................................................................. 8 
4.3.2. 
PEA Set ....................................................................................................................... 8 
4.3.3. 
Per Protocol Set (PPS) ............................................................................................... 8 
4.3.4. 
Safety Set ..................................................................................................................... 9 
4.4. SUBGROUPS ........................................................................................................................ 9 
5. 
PATIENT DISPOSITION ............................................................................................... 9 
5.1. DISPOSITION ....................................................................................................................... 9 
5.2. PROTOCOL DEVIATIONS ..................................................................................................... 9 
6. 
DEMOGRAPHICS AND BASELINE CHARACTERISTICS .................................. 10 
6.1. DEMOGRAPHICS ................................................................................................................ 10 
6.2. TOBACCO USAGE .............................................................................................................. 10 
6.3. FEMALE REPRODUCTIVE STATUS ..................................................................................... 10 
6.4. MEDICAL HISTORY ........................................................................................................... 10 
6.4.1. 
General Medical History .......................................................................................... 10 
6.4.2. 
Disease-Specific History ........................................................................................... 10 
6.5. INCLUSION AND EXCLUSION CRITERIA ............................................................................. 11 
7. 
TREATMENTS AND MEDICATIONS ....................................................................... 11 
7.1. PRIOR AND CONCOMITANT MEDICATIONS ........................................................................ 11 
7.2. STUDY TREATMENTS ........................................................................................................ 11 
7.2.1. 
Extent of Exposure .................................................................................................... 11 
7.2.2. 
Treatment Compliance .............................................................................................. 12 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 V
8. 
EFFICACY ANALYSIS................................................................................................. 12 
8.1. PRIMARY EFFICACY ENDPOINT ......................................................................................... 12 
8.2. SECONDARY EFFICACY ENDPOINT .................................................................................... 13 
8.2.1. 
Pulmonary Vascular Resistance (PVR) .................................................................... 13 
8.2.2. 
Composite Clinical Endpoints .................................................................................. 13 
8.2.3. 
Perioperative Findings ............................................................................................. 14 
8.2.4. 
Surgical Evaluation of Specimen .............................................................................. 14 
8.2.5. 
All-cause Death ......................................................................................................... 14 
8.2.6. 
Withdrawal during Randomised Treatment Phase ................................................... 15 
8.3. EXPLORATORY EFFICACY ENDPOINTS .............................................................................. 15 
9. 
SAFETY ANALYSIS ..................................................................................................... 16 
9.1. ADVERSE EVENTS ............................................................................................................. 16 
9.1.1. 
Incidence of Treatment Emergent Adverse Events ................................................... 16 
9.1.2. 
Relationship of Adverse Events to Study Drug ......................................................... 16 
9.1.3. 
Severity of Adverse Event.......................................................................................... 17 
9.1.4. 
Serious Adverse Events ............................................................................................. 17 
9.1.5. 
TEAEs Leading to Treatment Discontinuation/Study Discontinuation .................... 18 
9.1.6. 
TEAEs Leading to Death .......................................................................................... 18 
9.1.7. 
TEAEs of Special Interest ......................................................................................... 18 
9.2. CLINICAL LABORATORY EVALUATIONS ........................................................................... 18 
9.3. VITAL SIGN MEASUREMENTS ........................................................................................... 19 
9.4. ELECTROCARDIOGRAM ..................................................................................................... 19 
9.5. PHYSICAL EXAMINATION ................................................................................................. 20 
10. 
INTERIM ANALYSIS ................................................................................................... 21 
11. 
CHANGES IN THE PLANNED ANALYSIS .............................................................. 22 
12. 
REFERENCES ................................................................................................................ 23 
13. 
APPENDICES ................................................................................................................. 24 
13.1. 
SCHEDULE OF EVENTS ................................................................................................... 24 
13.2. 
WORLD HEALTH ORGANIZATION CLASSIFICATION FOR PATIENTS WITH PULMONARY 
ARTERIAL HYPERTENSION .......................................................................................................... 27 
13.3. 
SURGERY-RELATED COMPLICATIONS ............................................................................ 28 
13.4. 
ADVERSE EVENTS/ PRIOR OR CONCOMITANT MEDICATIONS DATE IMPUTATION .......... 29 
 
 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  VI 
List of Abbreviations 
 
AE 
adverse event 
ATC 
anatomical therapeutic chemical 
BP 
blood pressure 
CI 
confidence interval 
CTEPH 
chronic thromboembolic pulmonary hypertension 
DSMB 
data safety monitoring board 
ECG 
electrocardiogram 
ERA 
endothelin receptor antagonist 
eCRF 
electronic case report form 
HR 
heart rate 
ICA 
International CTEPH Association 
ICH 
International Council for Harmonisation 
ICU 
intensive care unit 
IEC 
independent ethics committee 
IRB 
institutional review board 
ITT 
intent to treat 
IWRS 
interactive web response system 
LVEDP 
Left ventricular end-diastolic pressure 
MedDRA 
Medical Dictionary for Regulatory Activities 
mPAP 
mean pulmonary arterial pressure 
mRAP 
mean right atrial pressure 
NT-proBNP 
N-terminal pro–B-type natriuretic peptide 
NO 
nitric oxide 
PAH 
pulmonary arterial hypertension 
PAWP 
pulmonary artery wedge pressure 
PDE5 
phosphodiesterase-5 
PEA 
pulmonary endarterectomy 
PH 
pulmonary hypertension 
PPS 
per-protocol set 
PT 
Preferred Term 
PVR 
pulmonary vascular resistance 
QTcF 
QT interval Fridericia correction 
RHC 
right heart catheterisation 
SAE 
serious adverse event 
SAP 
statistical analysis plan  
SBP 
systolic blood pressure 
sGC 
soluble guanylate cyclase 
SMQ 
Standardised MedDRA Query 
TEAE 
treatment-emergent adverse event 
tid 
3 times a day 
WHO 
World Health Organization 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 1
1. Introduction 
Chronic thromboembolic pulmonary disease is an important cause of severe pulmonary 
hypertension (PH) and is associated with significant morbidity and mortality. It is estimated that 
3.8% of patients suffering from an acute pulmonary embolus will develop chronic 
thromboembolic pulmonary hypertension (CTEPH) (Pengo Vet al 2004). CTEPH is 
characterised by obstruction of the pulmonary vasculature by residual organised thrombi and 
varying degrees of concomitant small vessel disease leading to increased pulmonary vascular 
resistance (PVR), progressive PH, and right ventricular failure. 
Pulmonary endarterectomy (PEA) is the surgical procedure that removes the obstructing 
thromboembolic material, resulting in significant improvements (or normalisation) in pulmonary 
haemodynamics and right ventricular function. PEA targets the accessible mechanical 
component contributing to PH and is a potentially curative treatment in CTEPH. Long-term 
survival and functional status were demonstrated to improve post-PEA (Cannon et al 2016). The 
perioperative mortality rate was 4.7% even from experienced centres (Pepke-Zaba et al 2011). 
This risk is higher in patients with high preoperative PVR (Jensen et al 2009). In the European 
CTEPH registry, an almost linear relationship between high preoperative PVR (>900-1100 
dyn·s·cm-5) and in-hospital mortality was observed (Mayer et al 2011). 
Riociguat is the first of a new class of drugs, the soluble guanylate cyclase (sGC) stimulators. 
Direct pharmacological stimulation of sGC, either alone or in combination with nitric oxide 
(NO), may provide a novel approach for the treatment of CTEPH. Nonclinical studies indicated 
that riociguat is a NO-independent but haeme-dependent stimulator of the sGC and effective in 
several cardiopulmonary animal models. There were 9 clinical studies completed with riociguat: 
six Phase 2 studies, two Phase 3 studies, and one Phase 3b study. Five Phase 2 studies were 
completed in the PH indication. All three of the Phase 3 completed studies were carried out in 
patients with PH. At this time, ten Phase 2, 3, and 4 studies are ongoing. Based on the pivotal 
Phase 2 and Phase 3 studies, riociguat tablets can provide reduction in PVR in patients with 
CTEPH, and can also improve other haemodynamic parameters (Ghofrani et al 2013). Riociguat 
is effective in treating patients with inoperable and persistent CTEPH after PEA, as well as 
patients with pulmonary arterial hypertension (PAH). The adverse event (AE) profile observed in 
the patient populations tested was within the range expected in these chronically ill patient 
groups. Overall, riociguat was safe and well tolerated and did not present untoward side effects 
not already identified in the patient populations studied. 
 
Riociguat is approved in patients with inoperable CTEPH or patients with persistent or recurring 
CTEPH after surgical treatment. The cumulative worldwide exposure to riociguat (Adempas®) 
since start of marketing authorisation until 31 AUG 2017 is estimated at 168,623 patient-months 
or approximately 14,052 patient years, excluding interventional clinical studies1.  
Improving pulmonary haemodynamics before surgery could potentially reduce the morbidity and 
mortality associated with PEA. To date there is no convincing evidence that preoperative 
treatment of technically operable CTEPH with endothelin receptor antagonists (ERAs), 
phosphodiesterase-5 (PDE5) inhibitors, or prostanoids is beneficial. This study will investigate if 
pre-PEA treatment with riociguat in technically operable CTEPH can improve preoperative 
pulmonary haemodynamics and key clinical outcomes after PEA.  


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 2
This statistical analysis plan (SAP) describes the analyses and data presentations for PEA 
Bridging Study based on protocol Version 3 which was issued on 27Jul2017 (amended on 
26Apr2018, Version 3.0). This document follows the principles of the international Guideline 
ICH E9. It contains definitions of analysis set, derived variables and statistical methods for the 
analysis of efficacy and safety. The purpose of the SAP is to ensure the credibility of the study 
findings by pre-specifying the statistical approaches to the analysis of study data prior to 
database lock and any data analysis for the final analysis. The SAP will be finalised before 
database lock and the breaking of the study blind. All statistical analyses detailed in this SAP 
will be conducted using SAS® software Version 9.3 or later (SAS Institute Inc, Cary, North 
Carolina).  
2. Objectives 
2.1. Primary Objective 
The primary objective of this study is to assess the efficacy of riociguat on preoperative PVR in 
patients with operable CTEPH. 
2.2. Secondary Objectives 
The secondary objectives of this study are the following: 
• To assess the efficacy of riociguat on other preoperative pulmonary haemodynamic 
parameters in patients with operable CTEPH 
• To assess the efficacy of riociguat on postoperative pulmonary haemodynamic 
parameters in patients with operable CTEPH 
• To assess the effect of riociguat on safety and efficacy aspects during PEA in patients 
with operable CTEPH 
• To assess the safety and tolerability of riociguat in patients with operable CTEPH 
3. Investigational Plan 
3.1. Overall Study Design and Plan 
This is a randomised, double-blind, placebo-controlled, multicentre, multinational, prospective 
study in patients with operable CTEPH prior to PEA with high preoperative PVR (>800 
dyn·s·cm-5). Eligible patients will be randomly assigned to riociguat or matching placebo 3 times 
a day (tid) in a 1:1 ratio. A total of 88 patients are planned to randomly assign at 4 sites in North 
America and Europe. 
A schematic of the study design is presented in Figure 3-1. 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 3
Figure 3-1 
Study Schematic 
 
 
 
 
 
 
 
 
 
 
 
Abbreviations: PEA, pulmonary endarterectomy; RHC, right heart catheterisation; V, visit 
 
Patients will undergo a screening period of up to 89 days prior to baseline (Visit 1). Following 
completion of the pretreatment screening phase, eligible study patients will be randomly 
assigned into the study. 
The study will comprise 3 study periods: 
• Screening Period (Day -89 to Day 1): The screening period of up to 90 days will be 
used to assess eligibility of patients and to allow for the washout of prohibited 
medications. Screening visit (V0) and randomisation visit (V1) can occur on the same 
day. 
• 
Treatment Period (Day 1 [Baseline] through Day 90): Patients will be randomly 
assigned on Day 1 to receive either riociguat or matching placebo tid in a 1:1 ratio for 3 
months. The study drug will be initiated at 1 mg and the dosage can be increased by 0.5 
mg at 2-week intervals based on tolerability (systolic blood pressure [SBP]) up to a 
maximum dose of 2.5 mg tid based on the algorithm mentioned in Section 3.4. The study 
drug will be initiated no later than 180 days after right heart catheterisation (RHC) (used 
for screening of patients) and within 90 days of planned RHC before PEA. At Visit 2, 
RHC will be performed per site procedures no more than 1 week prior to PEA, which 
will be conducted by the principal surgeon of the site. The study drug will be 
discontinued once PEA is performed. The last study dose will be given on the morning 
of PEA surgery. The patient will remain hospitalised per the investigator’s discretion.  
• Follow-up Period: A follow-up visit is planned at 6 months after PEA, at which time 
RHC will also be performed per study site procedures.  
A telephonic call visit is planned during treatment period and at Day 186±10 during follow-up 
period, where treating physician or designee will call patient to ask questions related to patient’s 
well-being and any adverse events. 
Based on the quality of the RHC data and the experience of the referring site, a referred patient 
(a patient where the previous RHC was performed at a site other than the study site) can be 
V4 
Final 
visit 
RHC 
V3 
Post-PEA 
visit 
Hospital course 
complications 
PEA 
Perioperative 
Surgical 
specimen 
V2 
Pre-
PEA 
visit 
RHC 
V1 
Randomisation and 
Baseline visit 
Initiate treatment 
(riociguat or placebo 
in a 1:1 ratio) 
V0 
Screening 
visit 
Up to 90 days 90 days 
180 days 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 4
enrolled in the study based on investigator’s discretion. The data of haemodynamic parameters at 
screening will be collected from the previous RHC. 
Patients who permanently discontinue study drug for any reason (ie, due to meeting the protocol 
mandated safety monitoring criteria) or who withdraw from the study prematurely (prior to the 
end of the double blind treatment period) will participate in the end of study safety follow up 
visit. 
Efficacy and safety assessments will be performed throughout the study, as presented in the 
Schedule of Events (Appendix 13.1). The primary efficacy measure is the reduction in PVR. 
Additional efficacy measures include cardiac output, cardiac index, mean right atrial pressure 
(mRAP), mean pulmonary arterial pressure (mPAP), pulmonary artery wedge pressure (PAWP), 
number and cause of deaths during the study, PH related hospitalisation, need for PAH-targeted 
and other medications, change in WHO functional class, perioperative findings that include 
circulatory arrest time and surgery related complications, surgical evaluation of specimen, 
withdrawal during the treatment phase, N-terminal pro–B-type natriuretic peptide (NT-proBNP) 
concentration, length of hospital and intensive care unit (ICU) stay, and time on mechanical 
ventilation. 
Safety assessments include monitoring of AEs, vital sign measurements, electrocardiogram 
(ECG) measurements, physical examinations, clinical laboratory examinations, and pregnancy 
testing. 
The end of the study is defined as when the last patient completes the last visit of the study ie, 6 
month follow up visit (Visit 4). 
An unblinded, independent data safety monitoring board will periodically review safety data and 
other study information during the conduct of the study. 
3.2. Study Endpoints 
3.2.1. Primary Efficacy Endpoint 
The primary efficacy endpoint is percent change from baseline in PVR immediately before PEA 
at Visit 2.  
3.2.2. Secondary Efficacy Endpoints 
The secondary efficacy endpoints for the study are mentioned below. 
1. PVR (6 months after PEA): percent change from baseline in PVR at Visit 4. 
2. Composite clinical endpoints (6 months after PEA), including patients with any one of the 
following clinical endpoints, from randomisation to Visit 4.  
• All-cause death 
• PH-related hospitalisation  
• Need for PAH-targeted therapy 
• Functional class unchanged or worse 
3. Perioperative findings at Visit 2: 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 5
• Circulatory arrest time 
• Surgery-related complications (Appendix 13.3) 
4. Surgical evaluation of specimen (difficulty to withdraw obstructive material): 
• Ease of dissection plane 
• Completeness of disease clearance 
• Clot and vessel wall 
5. All-cause death 
6. Withdrawal during randomised treatment phase 
3.2.3. Exploratory Efficacy Endpoints 
The exploratory efficacy endpoints are mentioned below. 
1. NT-proBNP measurement concentration change from baseline at the preoperative visit (Visit 
2) and at 6 months after PEA (Visit 4) 
2. Cardiac index change from baseline at the preoperative visit (Visit 2) and at 6 months after 
PEA (Visit 4) 
3. Mean right atrial pressure (mRAP) change from baseline at the preoperative visit (Visit 2) 
and at 6 months after PEA (Visit 4) 
4. Mean pulmonary arterial pressure (mPAP) change from baseline at the preoperative visit 
(Visit 2) and at 6 months after PEA (Visit 4) 
5. Pulmonary artery wedge pressure (PAWP) change from baseline at the preoperative visit 
(Visit 2) and at 6 months after PEA (Visit 4) 
6. Hospital length of stay 
The hospital length of stay in days will be derived from the first date when the patient is 
hospitalised for PEA until the date when the patient is discharged from the hospital.  
7. ICU length of stay in days 
8. Time on mechanical ventilation, in hours, from start of ICU stay until end of mechanical 
ventilation 
9. In-hospital mortality 
Only deaths that happen on or after PEA but before discharge from the hospital will be 
included. 
10. Functional class at the preoperative visit (Visit 2) and at 6 months after PEA (Visit 4) 
11. Need for PAH-targeted postoperative therapy from immediately after PEA to the 6-month 
visit (Visit 4) 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 6
3.2.4. Safety Endpoints 
The safety endpoints are the assessment of the safety and tolerability of riociguat as measured by 
the nature and frequency of AEs and changes in vital sign measurements, 12-lead ECGs, 
physical examination findings, and clinical laboratory analyses. 
3.3. Treatments 
Patients will initiate the treatment with either riociguat 1 mg or matching placebo tablets tid 
orally for 3 months. The study drug will be initiated no later than 180 days after RHC (used for 
screening of patients) and within 90 days of planned RHC before PEA. 
Riociguat is a film-coated, round shaped with 6-mm diameter, immediate-release tablet of pale 
orange colour. Placebo tablets are identical in appearance to riociguat but do not have the active 
compound. The following drug supplies will be used in the study:  
Product 
Supplied as 
Riociguat 
0.5 mg, 1 mg, 1.5 mg, 2 mg and 2.5 mg tablets 
Placebo 
Matching tablets 
3.4. Dose Adjustment/Modifications 
The study drug will be initiated at 1 mg and the dosage can be increased by 0.5 mg at 2-week 
intervals based on tolerability (SBP) up to a maximum dose of 2.5 mg tid. The individual study 
drug dose of the next titration step will be determined every 2 weeks at home according to the 
peripheral SBP measured at trough before intake of the morning dose under consideration of the 
following algorithm: 
• If trough SBP ≥95 mmHg, increase dose (+0.5 mg tid) 
• If trough SBP <95 mmHg without symptoms of hypotension, maintain dose 
• If any SBP <95 mmHg with clinical symptoms of hypotension such as dizziness or 
presyncope, stop study drug; restart after 24 hours with reduced dose (-0.5 mg tid) 
The blood pressure (BP) measuring device will be supplied along with study drug to each patient 
to monitor BP at home. If the dose is interrupted for 3 or more days, restart the dose with 1 mg 
tid and follow the up-titration algorithm. The up titration will be monitored by study staff 
contacting the patient by telephone at home. 
4. General Statistical Considerations 
• Data from all study centers will be combined for analysis. 
• Statistical methods to be used will be mainly descriptive. Summary statistics will be 
tabulated and represented graphically, whenever appropriate. 
• Continuous data will be summarised using descriptive statistics (i.e. n, mean, standard 
deviation, median, minimum, and maximum). Besides presentation of absolute values, 
tabulation for differences to baseline by time will be provided, if appropriate. Categorical 
data will be summarised using the frequency counts and percentages. Time to event data 
will be analysed using the Kaplan-Meier method. 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 7
• For the summary statistics of all numerical variables, unless otherwise specified, 
minimum and maximum will be displayed to the same level of precision as reported. 
Mean and median will be displayed to one level of precision greater than the data 
collected. Standard deviation / standard error will be displayed to two levels of precision 
greater than the data collected. P-values will be rounded to three decimal places. If a p-
value is less than 0.001 it will be reported as “<0.001”. If a p-value is greater than 0.999 
it will be reported as “>0.999”.  
• When frequency counts are presented, the percentage will be suppressed when the count 
is zero in order to draw attention to the non-zero counts. A row denoted “Missing” will be 
included in count tabulations where specified on the shells to account for dropouts and 
missing values. Percentages will be based on the total number of patients in the respective 
analysis set unless otherwise specified. 
• Unless otherwise specified, statistical tests will be 2-sided and performed using a 5% 
significance level, leading to 95% (2 sided) confidence intervals (CIs). Modelling 
techniques will be used in an exploratory sense. No adjustments for multiplicity are 
made. 
• Partial dates will be imputed based on the rules specified in Appendix 13.4. 
• All laboratory data will be reported by using the International System of Units. 
• Unless otherwise specified, the baseline will be defined as the last valid assessment, 
including assessments from the unscheduled visit, prior to the study drug administration.  
• A Visit 2 assessment is considered as valid only when the assessment is completed within 
7 days prior to PEA. For assessments at Visit 4, the nominal visit collected in electronic 
case report form (eCRF) will be used in the analysis. This rule is applicable to all 
endpoints derived by the visit. 
• By-patient listings will be created for each eCRF module for all screened patients. 
Patients will be identified in the listings by patient number. If data are to be summarised 
by visit, the visit name collected on the eCRF page will be used.  
• All analyses will be conducted using SAS® software Version 9.3 or later (SAS Institute 
Inc, Cary, North Carolina). 
4.1. Sample Size 
A total of 88 patients, accounting for a 10% dropout rate, will be randomly assigned into 
riociguat or placebo groups at a ratio of 1:1 in the study. The sample size for this study is not 
based on the required statistical power to test any specific hypothesis but feasibility to initially 
assess the safety and efficacy of riociguat on preoperative pulmonary haemodynamics in patients 
with operable CTEPH. 
4.2. Randomisation, Stratification, and Blinding 
Following completion of the screening period, eligible study patients will be randomly assigned 
into the study. An interactive web response system (IWRS) will be used to administer the 
randomisation schedule. In order to obtain a treatment group assignment for a patient, a site 
representative will access the IWRS. Patients will be randomly assigned on Day 1 to receive 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 8
either riociguat or matching placebo tid in a 1:1 allocation ratio for 3 months. No stratification of 
the randomisation schedule will be performed. 
The clinical study will be performed in a double-blinded manner. The investigator, study 
coordinator(s), patients, and the sponsor study team and its representatives will be blinded to the 
identity of the randomised treatment assignment from the time of randomisation until database 
lock. Randomisation data will be kept in strict confidence by the statistician who will generate 
the randomisation schedule, the IWRS provider, and the vendor involved in the study drug 
labelling. The identity of the treatments will be concealed by the use of study drugs that are all 
identical in packaging, labelling, schedule of administration, appearance, taste, and odour. 
A patient’s treatment assignment will not be broken until the end of the study unless medical 
treatment of the patient depends on knowing the study drug the patient received. In the event that 
the blind needs to be broken because of a medical emergency, the investigator may unblind an 
individual patient’s treatment allocation. As soon as possible, the investigator should first contact 
the medical monitor to discuss the medical emergency and the reason for revealing the actual 
treatment received by that patient. The treatment assignment will be unblinded through IWRS. 
Reasons for treatment unblinding must be clearly explained and justified in the eCRF. The date 
on which the code was broken together with the identity of the person responsible must also be 
documented. 
4.3. Analysis Set 
The following analysis sets will be used in the statistical analyses. 
4.3.1. Intent-to-Treat (ITT) Set 
The ITT set will consist of all patients who received at least one dosage of randomised study 
drug. All analyses using the ITT set will group patients according to randomised treatment. 
The ITT set will be used as the primary efficacy analysis set including primary, secondary, and 
exploratory efficacy analyses. 
4.3.2. PEA Set 
The PEA set will consist of all ITT patients who actually undergo PEA. All analyses using the 
PEA set will group patients according to randomised treatment. 
The PEA set will be used in efficacy analyses with assessments depending on the 
implementation of PEA. 
4.3.3. Per Protocol Set (PPS)  
The PPS will consist of all ITT patients who fulfil all inclusion/exclusion criteria, have at least 
80% overall dose compliance with study drug, have not taken any prohibited medication, have 
no significant protocol deviations, have valid PVR assessments at baseline (from patient history) 
and Visit 2, and undergo PEA as planned. All analyses using the PPS will group patients 
according to treatment actually received. A blind review of data will identify which patients will 
be included in the PPS. 
The PPS will be used in the primary and secondary efficacy analyses as supportive analyses.  


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
 
 9
4.3.4. Safety Set 
The safety set will consist of all patients who received any study drug. All analyses using the 
safety set will group patients according to treatment actually received. 
The safety set will be used in safety analyses. 
4.4. Subgroups 
Safety analyses (see Section 9.1) will be performed for the following subgroups for AEs 
occurring between V0 and V2: 
- 
Intake of concomitant DOACs or NOACs being reported during V0 to V2 
- 
Intake of concomitant vitamin K antagonists being reported during V0 to V2 
- 
Intake of concomitant ß-blockers being reported during V0 to V2 
5. Patient Disposition 
5.1. Disposition 
Patient disposition will be summarised by treatment group for the ITT set, unless otherwise 
specified.  
The number and percentage of patients in each analysis set defined in Section 4.3 will be 
tabulated. The number and percentage of patients entered each scheduled visit will also be 
tabulated.  
Patients who completed the study, patients who discontinued from the study and reasons of 
discontinuation will be tabulated using the frequency counts and percentages. 
The reasons for patients not completing the study will be recorded on eCRF with the following 
categories: Adverse Event, Death, Lack of Efficacy, Lost to Follow-up, Non-Compliance with 
Study Drug, Physician Decision, Pregnancy, Progressive Disease, Protocol Violation, Recovery, 
Trial Screen Failure, Study Terminated by Sponsor, Technical Problem, Withdrawal by Subject, 
and Other. 
Patient enrollment data and reasons for screen failure will be presented in a listing. Patient 
disposition data, including reasons for study discontinuation, will also be provided in a listing. 
5.2. Protocol Deviations 
The investigator or designee must document and explain in the patient’s source documentation 
any deviation from the approved protocol. The investigator may implement a deviation from, or 
a change of, the protocol to eliminate an immediate hazard to study patients without prior 
approval of the Institutional Review Board/Ethics Committee (IRB/IEC). As soon as possible 
after such an occurrence, the implemented deviation or change, the reasons for it, and any 
proposed protocol amendments should be submitted to the IRB/IEC for review and approval, to 
the sponsor for agreement, and to the regulatory authorities, if required. 
A deviation from the protocol is an unintended or unanticipated departure from the procedures or 
processes approved by the sponsor and the IRB/IEC and agreed to by the investigator. A 
significant deviation occurs when there is nonadherence to the protocol by the patient or 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  10 
investigator that results in a significant, additional risk to the patient. Significant deviations can 
include nonadherence to inclusion or exclusion criteria, enrollment of the patient without prior 
sponsor approval, or nonadherence to FDA regulations or ICH GCP guidelines, and will lead to 
the patient being withdrawn from the study. 
Protocol deviations will be documented by the clinical monitor throughout the course of 
monitoring visits. Principal investigators will be notified in writing by the monitor of deviations. 
The IRB/IEC should be notified of all protocol deviations in a timely manner. 
Protocol deviations will be reviewed in a blind data review meeting before database lock and 
patients with relevant protocol deviation will be excluded from the PPS (defined in Section 
4.3.3). A list of patients include in the PPS will be finalised and documented before database 
lock and the breaking of the study blind. 
The number and percentage of patients with significant deviations will be summarised in a table 
for the ITT set. All protocol deviations will be presented in a listing. 
6. Demographics and Baseline Characteristics 
Patient demographics and baseline characteristics will be summarised for the ITT set. Individual 
by-patient listings will be provided to support the summary tables. 
6.1. Demographics 
The continuous variables include age (years), body weight (kg), height (cm), and body mass 
index (BMI) (kg/m2), and waist circumference (cm) will be summarised using descriptive 
statistics. The categorical variables include gender, race and ethnicity will be summarised using 
frequency counts and percentages. 
BMI (kg/m2) is calculated as body weight in kg / (height in m)2. 
6.2. Tobacco Usage 
Patient’s tobacco usage data will be presented in a listing. 
6.3. Female Reproductive Status 
The method of birth control used for women along with fertility status will be recorded at the 
screening visit and will be presented in a listing.  
6.4. Medical History 
6.4.1. General Medical History 
Medical history will be coded using Medical Dictionary for Regulatory Activities® (MedDRA) 
Version 20.1 or higher. The number and percentage of patients with any medical history will be 
summarised by system organ class (SOC) and preferred term (PT) for each treatment group.  
6.4.2. Disease-Specific History 
The haemodynamic parameters at screening collected from the previous RHC will be 
summarised using descriptive statistics for following parameters: 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  11 
• pulmonary vascular resistance (PVR, mmHg) 
• mean right atrial pressure (mRAP, mmHg) 
• mean pulmonary arterial pressure (mPAP, mmHg) 
• cardiac output (L/min) 
• cardiac index (L/min/m2) 
• pulmonary artery wedge pressure (PAWP, mmHg) 
6.5. Inclusion and Exclusion Criteria 
Patients will be assigned to study drug only if they meet all of the inclusion criteria and none of 
the exclusion criteria.  
7. Treatments and Medications 
7.1. Prior and Concomitant Medications 
All concomitant medications taken by the patient during the study, from the date of signature of 
the informed consent will be recorded in the appropriate section of the eCRF. This will include 
all prescription drugs, herbal products, vitamins, minerals, and over-the-counter medications. 
Any changes in concomitant medications will also be recorded in the patient’s eCRF. 
A prior medication is defined as any medication that is ended prior to the date of first dose of 
study drug. A concomitant medication is defined as any medication that has a stop date that is on 
or after the date of first dose of study drug. Imputation for partial medication start dates and stop 
dates can be found in Appendix 13.4. Medications with completely missing stop dates will be 
classified as concomitant. 
Medications reported on the Concomitant medications eCRF page will be presented in data 
listings for prior medications and concomitant medications. Concomitant medications will be 
summarised by the following subgroups:  
Intake of concomitant DOACs or NOACs being reported during V0 to V2: Yes/No; 
Intake of concomitant vitamin K antagonists being reported during V0 to V2: Yes/No. 
Intake of concomitant ß-blockers being reported during V0 to V2: Yes/No 
7.2. Study Treatments 
The study drug will be initiated at 1 mg and the dosage can be increased by 0.5 mg at 2-week 
intervals based on tolerability up to a maximum dose of 2.5 mg tid. Study treatment will be 
classified into two groups, riociguat and placebo, regardless of the dosing scheme. Study drug 
accountability (dispensed and returned) and administration will be presented in a listing. 
7.2.1. Extent of Exposure 
Treatment duration in days is defined as the total number of days a patient is exposed to the 
study drug:  
• Treatment Duration (day) = Date of last dose - Date of first dose + 1. 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  12 
Because study drug adjustment may occur during the treatment period, the exposure to study 
drug will also be characterized by average daily dose, which is defined as below: 
• Average Daily Dose (mg/day) = Cumulative dose (mg) / Treatment duration (day) 
The cumulative dose (mg) will be defined as the sum of doses taken by patients during the 
treatment period. 
Descriptive statistics will be provided for treatment duration (day) and average daily dose 
(mg/day) by treatment group for the safety set and the PPS. The number and percentage of 
patients will also be summarised according to the maximum dose level (mg) received at the end 
of up-titration period. 
By-patient listing will be provided to support the summary table. 
7.2.2. Treatment Compliance 
Patient compliance with study drug will be assessed by the investigator and/or study personnel at 
Visit 2 and during a telephone call using direct questioning and tablet counts. Deviations from 
the prescribed treatment regimen will be recorded on the source document and the patient’s 
eCRF. 
The overall treatment compliance (%) will be evaluated by calculating the number of tablets 
taken by the patient divided by the number of tablets expected to be used during the treatment 
period and multiplied by 100. 
The number of tablets taken will be calculated by subtracting the number of tablets returned from 
the number of tablets dispensed. The number of tablets expected will be calculated by 
multiplying the total number of days of planned exposure to study drug (treatment duration) by 
the number of tablets planned per day (3 tablets per day). 
The overall treatment compliance (%) will be summarised using descriptive statistics.  
A patient is considered compliant if overall treatment compliance is greater than or equal to 80%. 
A categorical summary of whether patients were compliant (yes/no) will be present. The number 
and percentage of patients in compliance category of <80%, >=80 and <=120%, and >120% will 
also be presented.  
By-patient listing will be provided to support the summary table.  
8. Efficacy Analysis 
The primary analysis will use ITT set, all analyses on perioperative endpoints will use PEA set 
only; all analyses on postoperative endpoints will use PEA set and PPS. For other endpoints, the 
analysis set to be used is specified in each subsection below. By-patient listings will be provided 
to support the summary tables. 
8.1. Primary Efficacy Endpoint 
As defined in Section 3.2.1, the primary efficacy endpoint is percent change from baseline in 
PVR immediately before PEA at Visit 2. The PVR assessment from Visit 2 needs to be within 7 
days prior to PEA. Assessments out of the time frame will be considered invalid and be treated 
as missing. In the case of patients who do not undergo PEA, the PVR at Visit 2 will be treated as 
missing. 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  13 
The null hypothesis is that there is no difference between the treatment groups in percent change 
from baseline in PVR immediately before PEA at Visit 2, and the alternative is that the 
difference is not zero. The primary efficacy analyses will be conducted using the ITT set. Similar 
analysis will be repeated for the PPS as the supportive analysis. 
The difference in the percent change from baseline in PVR immediately before PEA at Visit 2 
between riociguat and placebo will be tested using the 2-sample Wilcoxon rank-sum test. 
Analysis of covariance (ANCOVA) with baseline value as the covariate will be employed to test 
the null hypothesis as a supportive analysis. Residuals for percent change form baseline in PVR 
will be generated by using PROC GLM procedure with baseline value as the covariate. A 
quantile-quantile (Q-Q) plot of residuals with p-value from Shapiro-Wilk test will be presented 
to test the normality of the residuals. 
To check the effect of missing values on the robustness of the primary analysis, the primary 
analysis will be repeated using the baseline observation carried forward approach for missing 
PVR values immediately before PEA at Visit 2.  
The PVR will be measured at pre-PEA visit (Visit 2) and at the 6-month follow-up visit (Visit 4). 
Observed values, changes from baseline and percent change from baseline will be provided for 
PVR using descriptive statistics by treatment group and scheduled visit.  
Boxplot will be used to present the percent change from baseline in PVR by treatment group and 
scheduled visit. The upper (lower) edge of the box represents the 75th (25th) percentile. A 
horizontal line in the box interior represents the median. Above the box a vertical line indicates 
the region from the 3rd quartile to the 95% percentile; below the box a vertical line indicates the 
region from the 1st quartile to the 5% percentile. Values outside the whiskers are displayed by a 
distinct marker. 
8.2. Secondary Efficacy Endpoint 
Secondary efficacy endpoints are defined in Section 3.2.2.  
8.2.1. Pulmonary Vascular Resistance (PVR) 
The difference in the percent change from baseline in PVR at Visit 4 between riociguat and 
placebo will be tested using the 2-sample Wilcoxon rank-sum test for the PEA set and the PPS.  
PVR assessment at Visit 4 will use the nominal visit information collected in eCRF without 
considering the time window because PVR status is expected to be stable after PEA. 
8.2.2. Composite Clinical Endpoints 
Composite clinical endpoints from randomisation to Visit 4 will be tabulated by treatment group 
containing the number and percentage of patients with an event as well as the number of event 
for the PEA set and the PPS. The Fisher exact test will be utilised to test the proportion 
difference along with the Clopper-Pearson exact CI when applicable. For analysis based on the 
ordinal response of functional class, the row mean score from the Cochran Mantel-Haenszel test 
will be used to test the response difference between groups. 
Composite clinical endpoints include following clinical endpoints:  
• All-cause death 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  14 
All deaths that happen after randomisation until the date of Visit 4, 6 months after the 
PEA, will be included.  
• PH-related hospitalisation  
All PH-related hospitalisation except the in-hospital care after PEA from randomisation 
until 6 months after PEA will be included. 
• Need for PAH-targeted therapy 
All PAH-targeted therapy from randomisation until 6 months after PEA will be included. 
• Functional class unchanged or worse 
When comparing the functional class assessment at Visit 1 with the functional class 
assessment at other visits, the same class will be defined as unchanged, and a higher 
class will be defined as worse. The worst case after treatment will be used. 
8.2.3. Perioperative Findings 
8.2.3.1. 
Circulatory Arrest Time 
Circulatory arrest time (minute) at Visit 2 from perioperative findings will be tabulated by 
treatment group using the descriptive statistics for the PEA set. An analysis of variance 
(ANOVA) will be employed to compare the mean difference between 2 groups. P-value from 
Shapiro-Wilk test will also be presented in this table to indicate the normality of this variable. In 
case normality assumption cannot hold, the Wilcoxon rank-sum test should be considered. 
8.2.3.2. 
Surgery-related Complications 
Surgery-related complications at Visit 2 from the perioperative findings will be tabulated by 
treatment group in a descriptive way for the PEA set, presenting the number and percentage of 
patients for each symptom. The Fisher exact test will be utilised to test the proportion difference 
along with the Clopper-Pearson exact CI. 
8.2.4. Surgical Evaluation of Specimen 
Surgical evaluations of specimen, including ease of dissection, completeness of disease 
clearance, clot and vessel wall, are from perioperative measures (Visit 3).  
Ease of dissection plane will be classed as easier than normal (1), normal (2), more difficult than 
normal (3); Completeness of disease clearance will be classed as better than expected (1), as 
expected (2), worse than expected (3); Both clot and vessel wall will be measured as score of 1 
to 3 with the following scores: more solid than usual (1), normal (2) more friable than usual (3). 
The data will be treated as an ordinal response. A higher score means a worse case. 
Surgical evaluations of specimen will be tabulated by treatment group for the PEA setcontaining 
the number and percentage of patients in each level. The Cochran Mantel-Haenszel test will be 
used to test the ordinal response difference between groups. 
8.2.5. All-cause Death 
All-cause death on or after randomisation will be tabulated by treatment group containing the 
number and percentage of patients with event for the PEA set and the PPS. All-cause death 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  15 
during the whole study course, include deaths occurred during the screening period, will be 
captured in safety analyses.  
Time from randomisation to death (in days) will be analysed using the Kaplan Meier method. 
Median and quartiles in days and associated 95% CI will be calculated using the LOGLOG 
transformation. All patients who are withdrawn or lost to follow-up prior to the end of the study, 
or who are still alive at the end of the study will be censored at the time of last contact, defined 
as the last reported visit date. 
8.2.6. Withdrawal during Randomised Treatment Phase 
Withdrawal during the randomised treatment phase along with the reason for withdrawal will be 
tabulated by treatment group for the ITT set and the PPS containing the number and percentage 
of patients with event. Only withdrawals after randomisation but before PEA will be included. 
8.3. Exploratory Efficacy Endpoints  
Exploratory efficacy endpoints are defined in Section 3.2.3. No formal assessment of difference 
between treatment groups will be performed for any of the exploratory efficacy endpoints. The 
difference between treatment groups in exploratory efficacy endpoints will be estimated with 
95% CIs to quantify the treatment effect. 
Summary tables presenting observed values and changes from baseline for NT-proBNP 
measurement concentration (pg/mL), cardiac output (L/min), cardiac index (L/min/m2), mRAP 
(mmHg), mPAP (mmHg), and PAWP (mmHg) will be provided for each treatment group by 
scheduled visits using descriptive statistics. The difference in the change from baseline between 
treatment groups with 95% CIs will be estimated non-parametrically using Hodges-Lehmann 
estimation of location shift in the tables. The analyses will be based on the PEA set and the PPS. 
Hospital length of stay in days and ICU length of stay in days will be summarised using 
descriptive statistics. The difference between treatment groups with 95% CI will be estimated 
non-parametrically using Hodges-Lehmann estimation of location shift in the table. The analyses 
will be based on the PEA set. 
Time from start of ICU stay to end of mechanical ventilation (in hours) will be analysed using 
the Kaplan Meier method. Median and quartiles in days and associated 95% CI will be calculated 
using the LOGLOG transformation. All patients stayed in ICU who do not have end date of 
mechanical ventilation will be censored at the time of discharged from the ICU. The analyses 
will be based on the PEA set. 
Proportion of in-hospital mortality will be summarised using the frequency counts and 
percentages for the PEA set. Proportion difference between treatment groups along with the 
Clopper-Pearson exact CI will be provided 
The proportion of patients who need PAH-targeted therapy immediately after PEA to  Visit 4 
will be summarised using the frequency counts and percentages for the PEA set and the PPS. 
Proportion difference between treatment groups along with the Clopper-Pearson exact CI will be 
provided. 
WHO functional class will be summarised by scheduled visit for each treatment group. Shift 
table of baseline functional class versus functional class at each postbaseline scheduled visit will 
be provided. The analyses will be based on the PEA set and the PPS. 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  16 
9. Safety Analysis 
The purpose of this section is to define the safety analyses for the study. Safety assessments 
include adverse events, vital sign measurements, ECG measurements, physical examination, 
clinical laboratory examination, and pregnancy testing. Safety assessments will be performed at 
time points specified in Schedule of Events (Appendix 13.1). All summaries of safety data will 
be conducted using the safety set. 
9.1. Adverse Events 
An adverse event (AE) is defined as any untoward medical occurrence in a patient enrolled into 
this study regardless of its causal relationship to study drug. Adverse events will be assessed 
from the time the patient signs the ICF until exit from the study. In addition to patient 
observations, AEs identified from any study data (eg, laboratory values, physical examination 
findings, ECG changes) or identified from review of other documents that are relevant to patient 
safety will be defined as AEs and recorded appropriately. All AEs reported or observed during 
the study will be recorded on the AE page in the eCRF. Adverse events will be coded using 
MedDRA (Version 20.1 or higher). 
An overall summary of the number and percentage of patients having any treatment emergent 
adverse event (TEAE), serious TEAE, treatment-related TEAE, treatment-related serious TEAE, 
TEAE leading to permanent discontinuation of treatment, TEAE leading to study 
discontinuation, TEAE with outcome death, and TEAE of special interest will be provided by 
treatment group. All AEs will be listed including the investigator term, the preferred term, start 
and end dates of the AE, duration (days), severity, drug relationship, action taken, and outcome 
for all screened patients. 
9.1.1. Incidence of Treatment Emergent Adverse Events 
A treatment-emergent adverse event (TEAE) is defined as any event not present before exposure 
to study drug or any event already present that worsens in either intensity or frequency after 
exposure to study drug. If start date of an AE is missing after imputation, the corresponding AE 
will be included as TEAE if end date of AE is after the first dose of study drug or the end date is 
also missing. Imputation for partial AE start dates and end dates can be found in Appendix 13.4. 
The number and percentage of patients with at least one TEAE will be summarised by MedDRA 
system organ class (SOC) and preferred term (PT). At each level of SOC or PT, a patient will be 
counted only once if the patient reported multiple events. 
The above analysis will also be conducted for TEAEs occurred from V0 to V3 and by subgroups 
as defined in section 4.4. 
9.1.2. Relationship of Adverse Events to Study Drug 
The relationship or association of the study drug in causing or contributing to the AE will be 
characterised using the following classification and criteria: 
Unrelated: 
This relationship suggests that there is no association between the study drug and 
the reported event. 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  17 
Possible: 
This relationship suggests that treatment with the study drug caused or 
contributed to the AE, ie, the event follows a reasonable temporal sequence from 
the time of drug administration or follows a known response pattern to the study 
drug, but could also have been produced by other factors. 
Probable: 
This relationship suggests that a reasonable temporal sequence of the event with 
drug administration exists and, based upon the known pharmacological action of 
the drug, known or previously reported adverse reactions to the drug or class of 
drugs, or judgment based on the investigator’s clinical experience, the 
association of the event with the study drug seems likely. The event disappears 
or decreases on cessation or reduction of the dose of study drug. 
Definite: 
This relationship suggests that a definite causal relationship exists between drug 
administration and the AE, and other conditions (concurrent illness, 
progression/expression of disease state, or concurrent medication reaction) do 
not appear to explain the event. The event reappears or worsens if the study drug 
is readministered. 
Treatment-related AEs are those rated by the investigator as “definite,” “probable,” or 
“possible.” In case the relationship is unknown or missing, the worst case (definite) will be 
assumed and the AE will be considered to be drug related. TEAEs will be summarised by SOC, 
PT and relationship using the frequency counts and percentages. 
The above analysis will also be conducted for TEAEs occurred from V0 to V3 for overall 
patients in the Safety set and by subgroups as defined in section 4.4. 
9.1.3. Severity of Adverse Event 
The severity, or intensity, of an AE refers to the extent to which an AE affects the patient’s daily 
activities. The intensity of the AE will be rated as mild, moderate, or severe using the following 
criteria: 
Mild: 
An event usually transient in nature and generally not interfering with normal 
activities. 
Moderate: 
An AE that is sufficiently discomforting to interfere with normal activities. 
Severe: 
An AE that is incapacitating and prevents normal activities. 
In case the severity is unknown or missing, the worst case (severe) will be assumed in the 
summary tables. A summary of TEAEs by SOC, PT and severity will be performed using the 
worst severity grade. 
The above analysis will also be conducted for TEAEs occurred from V0 to V3 for overall 
patients in the Safety set and by subgroups as defined in section 4.4. 
9.1.4. Serious Adverse Events 
A serious adverse event (SAE) is defined as any event that results in death, is immediately life 
threatening, requires inpatient hospitalisation or prolongation of existing hospitalisation, results 
in persistent or significant disability/incapacity, or is a congenital anomaly/birth defect. The 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  18 
hospitalisation due to study-related procedures ie, for scheduled RHC and PEA will not be 
considered as an SAE for this study. 
The serious TEAEs, treatment-related serious TEAEs will be summarised by SOC and PT using 
the frequency counts and percentages. All serious AEs will be presented in a listing. 
The above analysis will also be conducted for TEAEs occurred from V0 to V3 for overall 
patients in the Safety set and by subgroups as defined in section 4.4. 
9.1.5. TEAEs Leading to Treatment Discontinuation/Study Discontinuation 
TEAEs leading to permanent discontinuation of treatment and TEAEs leading to study 
discontinuation will be summarised by SOC and PT using the frequency counts and percentages 
respectively. 
The above analysis will also be conducted for TEAEs occurred from V0 to V3 for overall 
patients in the Safety set and by subgroups as defined in section 4.4. 
9.1.6. TEAEs Leading to Death 
TEAEs with outcome death will be summarised by SOC and PT using the frequency counts and 
percentages.  
All-cause of death during the whole study course will be presented in a listing. 
The above analysis will also be conducted for TEAEs occurred from V0 to V3 for overall 
patients in the Safety set and by subgroups as defined in section 4.4. 
9.1.7. TEAEs of Special Interest 
The following TEAEs of special interest will be defined and included in summary tables by 
treatment group: 
MedDRA coding 
• 
“Myocardial infarction” and “Acute myocardial infarction” as preferred term; 
• 
“Haemorrhage” will be assessed by using the standardised MedDRA query (SMQ); 
• 
“Hypotension”, “haemoptysis”, “syncope” will be assessed as preferred term; 
• 
“Stroke” will be assessed by using the preferred terms “haemorrhagic stroke”, 
“ischaemic stroke” and “embolic stroke”. 
The TEAEs of special interest will be summarized by group: Myocardial infarction, 
Haemorrhage, Hypotension, Haemoptysis, Syncope, Stroke and also by study period V0 to V2, 
V0 to V4, medication of interest subgroup as defined in Section 4.4. The number of patients 
along with number of events in each level of summary will be provided.  
9.2. Clinical Laboratory Evaluations 
Laboratory assessments include clinical laboratory testing, pregnancy test, and hepatitis B virus, 
hepatitis A immunoglobulin M, hepatitis C antibody, and human immunodeficiency virus screen. 
If any of the laboratory parameters of interest show a significant shift from baseline, patients will 
then be scheduled for an interim visit within 2 weeks to have the laboratory measurements 
repeated. 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  19 
Routine clinical laboratory testing will be performed by a central laboratory and will include the 
following: 
• Haematology: haemoglobin, haematocrit, red blood cell count, white blood cell count 
with differential, mean corpuscular volume, mean corpuscular haemoglobin, mean 
corpuscular haemoglobin concentration, and absolute platelet count; 
• Clinical chemistry: total protein, sodium, potassium, calcium, chloride, inorganic 
phosphate, albumin, fasting blood glucose, glycated haemoglobin, high-density 
lipoprotein and low-density lipoprotein cholesterol, triglycerides, blood urea nitrogen, 
creatinine (and creatinine clearance by the Cockroft-Gault formula), uric acid, bilirubin 
(total and direct), alkaline phosphatase, aspartate aminotransferase, alanine 
aminotransferase, γ glutamyltransferase, lactate dehydrogenase, creatine kinase, 
cardiovascular marker panel, and high-sensitivity C-reactive protein; 
• Urinalysis: appearance, colour, pH, specific gravity, glucose, blood, bilirubin, leukocyte 
esterase, ketones, nitrates, urine protein, urine creatinine, protein/creatinine ratio. 
Microscopic urinalysis will be performed if urinalysis results are abnormal. 
Pregnancy testing will be performed for all women of childbearing potential. Urine dipstick or 
serum pregnancy testing will be performed at Visit 0. Serum pregnancy testing will be performed 
for all other applicable visits. 
Summary tables presenting observed values and changes from baseline over time will be 
presented for continuous laboratory parameters by treatment group. Categorical laboratory 
parameters will be summarised using the frequency counts and percentages. 
All relevant laboratory parameters will be classified as Low, Normal, and High according to the 
normal ranges if applicable. Shift tables of baseline categories versus categories at each 
postbaseline scheduled visit and the worst postbaseline value will be provided. Worst 
postbaseline value is the smallest value for criteria below a certain threshold or the largest value 
for criteria above a certain threshold. If a patient has a value below the threshold and above the 
threshold, the value furthest from the threshold will be chosen. 
All laboratory data with normality status will be presented in a listing. 
9.3. Vital Sign Measurements 
Vital signs, including blood pressure (mmHg), heart rate (BEATS/MIN), respiration 
(BREATHS/MIN), and body temperature (oC) will be obtained with the patient in a supine or 
seated position after resting for approximately 5 minutes.  
Observed values and changes from baseline will be provided for vital signs parameters using 
descriptive statistics by treatment group and scheduled visit.  
All vital sign measurements will be presented in a listing. 
9.4. Electrocardiogram 
Twelve-lead ECGs will be performed to calculate the heart rate (HR, BEATS/MIN), PR Interval 
(msec), QRS Duration (msec), QT Interval (msec), and QT interval Fridericia correction (QTcF, 
msec). The ECGs will be obtained with the patient in  supine position. All standard 12 lead 
ECGs will be recorded and analysed locally at the site by the investigator. 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  20 
Observed values and changes from baseline will be provided for ECG parameters using 
descriptive statistics by treatment group and scheduled visit.  
The proportion of patients with a clinically significant abnormal ECG result will be provided by 
treatment group and scheduled visit.  
A summary of shifts in 12-lead ECG abnormalities from baseline will be provided by scheduled 
visits. 
ECG results for all patients will be presented in a listing.  
9.5. Physical Examination 
A complete physical examination including assessments of the head, eyes, ears, nose, throat, 
skin, neck (including thyroid), lungs, cardiovascular system, abdomen, lymph nodes, and 
extremities will be obtained at screening. A physical examination including updates since the 
screening visit with focus on previously noted abnormalities in organ systems, including skin and 
hair, will be completed at time points specified in Schedule of Events. 
Physical examination data will be summarised by treatment group and body system with number 
and percentage of patients.  
Physical examination results for all patients will be presented in a listing.  
 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  21 
10. Interim Analysis 
A data safety monitoring board (DSMB) will review unblinded safety data throughout the study 
and make recommendations as appropriate. Further details are specified in the DSMB charter. 
 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  22 
11. Changes in the Planned Analysis 
The changes for the statistical analyses from the protocol to this SAP are stated below: 
1. The analysis set to be used for perioperative endpoints (Circulatory Arrest Time, Surgery-
related Complications, Surgical Evaluation of Specimen, PEA hospital length of stay, PEA 
ICU length of stay, Time on mechanical ventilation, In-hospital mortality) have been updated 
to PEA set only, with the consideration that these endpoints are peri-PEA surgery related 
endpoints and it makes more sense to narrow down the patients to those who have undergone 
PEA surgery only. 
 
2. The analysis sets to be used for postoperative endpoints (Percent Change in PVR from 
baseline to Visit 4, Composite clinical endpoint from baseline to Visit 4, NT-proBNP, 
cardiac output , cardiac index, mRAP, mPAP, PAWP change from baseline to Visit 4, 
Functional class at Visit 4, All-cause death, Need for PAH-targeted postoperative therapy at 
Visit 4) have been updated to PEA set and PPS, with the consideration that the endpoints are 
post-PEA surgery endpoints, and it makes more sense to restrict the analysis to patients who 
undergone PEA surgery; PPS will be used since those per-protocol patients need to be 
considered as a complementary analysis set.  
 
3. The analysis defined in the protocol “For laboratory data, the proportion of patients with 
clinically significant abnormal values as reported by the investigator will be provided by 
laboratory parameter, dose cohort, and scheduled visit.” Will be removed since it is 
confirmed by central labs that the data on ‘clinically significant/non-clinically significant” 
will not be obtained. 
 
4. The observation period for composite endpoints as now defined in section 8.2.2 has been 
changed to ‘from randomisation to Visit 4’ instead of ’from PEA to Visit 4’ since it is of 
more interest to investigate the endpoints from randomization; 
 
5. The exploratory endpoint ‘Need for PAH-targeted postoperative therapy at the 6-month visit 
(Visit 4)‘ in the protocol has been changed to ‘Need for PAH targeted postoperative therapy 
from immediately after PEA to Visit 4’ since it is of more interest to see if PAH targeted 
therapy occurs from PEA till Visit 4. 
The surgical evaluation of specimen is from perioperative measurement (Visit 3), according to 
the new text of Appendix 1 in  Protocol Amendment 1. 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  23 
12. References 
1.  Investigator’s Brochure V18.0 23Feb18, Section “5.4.2 Exposure Information”.  


International CTEPH Association (ICA) 
 
      
 Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
 
 
 
Date Issued: 14DEC2020  
 
 
 24 
13. Appendices 
13.1. 
Schedule of Events 
 
 
Visit 0 
Visit 1 
Visit 2 
Visit 3 
Visit 4 
 
Pretreatment / 
Screening 
Randomisation & 
baseline visit 
RHC visit (Pre-
PEA) 
Post-PEA 
Follow-up visit 
incl. RHC 
Time frame 
Day -89 to 1 
Day 1 
Day 90+30 
Day 96a 
Day 276±10 
Activity / Observation 
 
 
 
 
 
Written informed consent 
X 
 
 
 
 
Inclusion/exclusion criteria review  
X 
(X)b 
 
 
 
Assessment of current tobacco use 
X 
 
 
 
 
Demographic data including height and 
weight 
X 
 
 
 
 
HIV test 
(X)b 
X 
 
 
 
Medical and treatment history  
X 
X 
 
 
 
Physical examination including WHO 
functional class 
X 
X 
X 
X 
X 
Vital sign measurements 
X 
X 
X 
X 
X 
Clinical laboratory assessments (haematology, 
clinical chemistry, and urinalysis) 
(X)b 
X 
X 
X 
X 
NT-proBNP measurement 
 
X 
X 
 
X 
Haemodynamics incl. PVR, mRAP, mPAP, 
cardiac index, pulmonary artery wedge 
pressure measurement 
Xc 
 
X 
 
X 
12-lead ECG 
 
X 
X 
 
X 
Pregnancy test (if applicable)d 
X 
X 
X 
 
X 
Randomisation/treatment assignment  
 
X 
 
 
 
Administration of double-blind study drugse 
 
X 
X 
 
 
Provision of patient diary 
X 
 
 
 
 


International CTEPH Association (ICA) 
 
      
 Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
 
 
 
Date Issued: 14DEC2020  
 
 
 25 
 
Visit 0 
Visit 1 
Visit 2 
Visit 3 
Visit 4 
 
Pretreatment / 
Screening 
Randomisation & 
baseline visit 
RHC visit (Pre-
PEA) 
Post-PEA 
Follow-up visit 
incl. RHC 
Time frame 
Day -89 to 1 
Day 1 
Day 90+30 
Day 96a 
Day 276±10 
Activity / Observation 
 
 
 
 
 
Perioperative assessment (circulatory arrest 
time, surgery-related complications) 
 
 
Xf 
 
 
Surgical evaluation of specimeng 
 
 
 
Xg 
 
Hospital and ICU length of stay 
 
 
 
X 
 
Time on mechanical ventilation 
 
 
 
X 
 
PAH-targeted therapy assessment 
X 
X 
X 
X 
X 
PH-related hospitalisation 
 
X 
X 
X 
X 
Adverse event monitoring 
X 
X 
X 
X 
X 
Concomitant medications 
 
X 
X 
X 
X 
Return of patient diary 
 
 
 
X 
 
Return of study drug 
 
 
 
X 
 
Telephone call 
 
 
Xh 
 
Xi 
Patient compliance check (study procedures 
and study drug) 
 
X 
X 
X 
X 
Abbreviations: ECG, electrocardiogram; HIV, human immunodeficiency virus; ICU, intensive care unit; incl., including; mPAP, mean pulmonary arterial 
pressure; mRAP, mean right atrial pressure; NT-proBNP, N-terminal pro–B-type natriuretic peptide; PAH, pulmonary arterial hypertension; PEA, pulmonary 
endarterectomy; PH, pulmonary hypertension; PVR, pulmonary vascular resistance; RHC, right heart catheterisation; WHO, World Health Organization 
a The PEA will be conducted by the principal surgeon of the site within a week of RHC. 
b When laboratory analysis results are required/available (see Protocol Section 4.2) 
c Patients must have undergone an RHC ≤ 180 days before Visit 1. This procedure is considered a prerequisite for participation and not part of the study itself. If 
it was performed at a referring centre, it is at the investigators’ discretion based on the quality of the RHC data and the experience of the referring site to 
enroll the patient. 
d Urine dipstick or serum pregnancy testing will be performed at Visit 0. Serum testing will be performed for all other applicable visits. 
e The study drug will be initiated no later than 180 days after RHC. At Visit 2, RHC will be performed within 90 days of the initiation of treatment per site 
procedures no more than 1 week prior to PEA. 
f Perioperative measures. 
g Difficulty to withdraw obstructive material, ease of dissection plane (easier than normal, normal, or more difficult than normal), completeness of disease 
clearance (better than expected, as expected, or worse than expected). 


International CTEPH Association (ICA) 
 
      
 Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
 
 
 
Date Issued: 14DEC2020  
 
 
 26 
h The treating physician should contact the patient at least once by telephone during treatment period. 
i The treating physician should contact the patient during follow-up at 186±10 day by telephone, where questions related to patient’s well-being adverse events 
can be asked. 
 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  27 
13.2. 
World Health Organization Classification for Patients With Pulmonary 
Arterial Hypertension 
Functional Class 
Symptomatic Profile 
I 
Patients with pulmonary hypertension but without resulting 
limitation of physical activity. Ordinary physical activity does not 
cause dyspnoea or fatigue, chest pain, or near syncope 
II 
Patients with pulmonary hypertension resulting in slight limitation 
of physical activity. They are comfortable at rest. Ordinary physical 
activity causes undue dyspnoea or fatigue, chest pain, or near 
syncope 
III 
Patients with pulmonary hypertension resulting in marked limitation 
of physical activity. They are comfortable at rest. Less than ordinary 
activity causes undue dyspnoea or fatigue, chest pain, or near 
syncope 
IV 
Patients with pulmonary hypertension with inability to carry out any 
physical activity without symptoms. These patients manifest signs 
of right heart failure. Dyspnoea and/or fatigue may even be present 
at rest. Discomfort is increased by any physical activity 
 
 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  28 
13.3. 
Surgery-related complications 
Surgery-related complications are defined as the following: 
• Bleeding and/or blood loss >1 L in 12 hours 
• Airway bleed with need for extracorporeal membrane oxygenation 
• Any use of extracorporeal membrane oxygenation for respiratory or haemodynamic 
support, specified as veno-venous or veno-arterial 
• Prolonged ventilation >96 hours 
• Need for tracheostomy 
• Need for drainage of pericardial effusion 
• Neurological complications, ie, stroke, cerebral, subdural bleeding 
• Reintubation or noninvasive ventilation for reperfusion response 
• Haemoptysis requiring any intervention 
• Renal failure requiring dialysis 
• Wound infections 
• Pneumonia 
• Prolonged need for inotropic support (≥ 5 days) 
 
 


International CTEPH Association (ICA) 
 
Statistical Analysis Plan, Version 1.0, Amendment1.0 
PEA Bridging Study 
 
Date Issued: 14DEC2020 
 
  
 
  29 
13.4. 
Adverse Events/ Prior or Concomitant Medications Date Imputation 
Incomplete Start Date: 
Missing day and month 
• If the year is the same as the first dose of study drug, then the date of the first dose of 
study drug will be assigned to the missing fields. 
• If the year is before the year of first dose of study drug, then December 31 will be 
assigned to the missing fields. 
• If the year is after the year of first dose of study drug, then January 1 will be assigned to 
the missing fields. 
Missing day only  
• If the year is the same as the year of the first dose of study drug 
− If the month is before the month of the first dose of study drug, then the last day of 
the month will be assigned to the missing day. 
− If the month is the same as the month of the first dose of study drug, then the day of 
the first dose of study drug will be assigned to the missing day. 
− If the month is after the month of the first dose of study drug, then “01” will be 
assigned to the missing day. 
• If the year is before the year of the first dose of study drug, then the last day of the month 
will be assigned to the missing day. 
• If the year is after the year of the first dose of study drug, then “01” will be assigned to 
the missing day. 
If year is missing, start date will not be imputed. If the end date is complete, and the imputed 
start date is after the end date, the start date will be imputed by the end date. 
Incomplete End Date: 
Missing day and month 
• December 31 will be assigned to the missing fields. 
Missing day only  
• The last day of the month will be assigned to the missing day. 
If imputed end date is later than death date if available, the death date will be used as the imputed 
end date.