A Phase 2a Open-Label Trial of the Effects of Intravenous GC4419 on the Incidence and Severity of Esophagitis in Subjects Receiving Chemoradiotherapy for Lung Cancer
Phase: PHASE2
Conditions: Esophagitis
Sponsor: Galera Therapeutics, Inc.

Clinical Study Protocol GTI-4419-203 
Galera Therapeutics, Inc. 
Confidential 
1 
CLINICAL STUDY PROTOCOL 
 
Study Title: 
A Phase 2a Open-Label Trial of the Effects of Intravenous 
GC4419 on the Incidence and Severity of Esophagitis in 
Subjects Receiving Chemoradiotherapy for Lung Cancer 
 
 
Sponsor: 
Galera Therapeutics, Inc. 
 
 
IND Number: 
143,437 
 
 
Protocol ID: 
GTI-4419-203 
 
 
Medical Monitor: 
Jon T. Holmlund, MD 
Charlotte Moser, MD PhD 
 
 
Protocol Version/Date: 
Amendment 3: 24 February 2021 
 
CONFIDENTIAL INFORMATION 
The information contained in this document is proprietary to Galera Therapeutics, Inc. 
The information is to be used only in connection with review of, or participation in, 
authorized clinical studies of the investigational drug described in the protocol. 
Disclosure of the information to others not under obligations to maintain this information 
in confidence is prohibited without written authorization from Galera Therapeutics, Inc. 
with the exception that, to the extent necessary to obtain informed consent from those 
persons to whom the drug may be administered, a general protocol description may be 
disclosed to such potential subjects. 
 
 

Clinical Study Protocol GTI-4419-203 
Galera Therapeutics, Inc. 
Confidential 
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STUDY ACKNOWLEDGEMENT 
A Phase 2a Open-Label Trial of the Effects of Intravenous GC4419 on the Incidence and 
Severity of Esophagitis in Subjects Receiving Chemoradiotherapy for Lung Cancer. 
Amendment 3: 24 February 2021 
This protocol has been approved by Galera Therapeutics, Inc. The following signature documents 
this approval. 
 
 
Jon T. Holmlund, MD 
Chief Medical Officer 
Galera Therapeutics, Inc. 
Investigator Statement 
I have read the attached protocol and appendices dated 24 February 2021 and agree to abide by all 
provisions set forth therein. I will provide copies of the protocol and other pertinent information to all 
individuals responsible to me who will assist with the study. 
I agree to comply with the International Conference on Harmonisation, Tripartite Guideline on Good 
Clinical Practice (ICH, GCP) and applicable global and local government regulations/guidelines 
including 21 Code of Federal Regulations (CFR) Parts 11, 50, 54, 56, and 312.   
I agree to ensure that Financial Disclosure Statements will be completed before study initiation, 
during the studies if there are changes that affect my financial disclosure status, and one year after 
study completion by: 
• myself (including, if applicable, my spouse [or legal partner] and dependent children) 
• my sub-investigators (including, if applicable, their spouses [or legal partners] and dependent 
children) 
I agree to ensure that the confidential information contained in this document will not be used for any 
purpose other than the evaluation or conduct of the clinical investigation without the prior written 
consent of Galera Therapeutics. 
The Sponsor or its designee will have access to source documentation from which case report forms 
have been completed. 
 
__________________________________ 
__________________________ 
Signature of Principal Investigator 
Date (DD Month YYYY) 
 
__________________________________ 
Printed Name of Principal Investigator 
 

Clinical Study Protocol GTI-4419-203 
Galera Therapeutics, Inc. 
Confidential 
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REVISION HISTORY 
Revisions to Amendment 2 dated 27 January 2020 
Summary of Change  
Rationale  
Affected Protocol Sections 
Updated estimated enrollment 
period and studied period 
To be accurate with current 
study status 
• 
Synopsis 
Revised Inclusion criteria 1 to 
include all stage 3 (AJCC version 
8) NSCLC 
All stage 3 NSCLC by AJCC 
8th edition receive CTRT as 
standard of care and carry 
the same risk of radiation 
induced esophagitis 
• 
Synopsis 
• 
Section 6.1 
• 
Section 7.1 
Added formula for Inclusion 
criteria 6a (creatinine clearance) 
To provide sites with further 
guidance 
• 
Synopsis 
• 
Section 7.1 
Risk estimation based on historic 
controls: ≥ Grade 2 esophagitis 
incidence changed from 50 to 30% 
Adapted on risk profile of ≥ 
Grade 2 esophagitis with 
75% of plans done with 
modulated radiotherapy 
planning rather than 3D-
conformal (Kwint 2012, 
Palma 2013) 
• 
Synopsis 
• 
Section 4.1 
• 
Section 12.2 
• 
Section 12.6 
Exclusion criteria #9 changed to 
“symptomatic pneumonitis (≥ 
Grade 2 CTCAE v 5.0)” 
Asymptomatic changes are 
not systematically scored in 
daily practice. All changes in 
lung are relative to baseline. 
• 
Synopsis 
• 
Section 7.2 
Exclusion criteria #11 changed to 
“history of hepatitis” 
Because of the risk of 
reactivation of hepatitis in 
subjects with a history of 
disease, these subjects will 
be excluded. 
• 
Synopsis 
• 
Section 7.2 
Larger visit window allowed for 
post-RT assessments (4 week and 
90-day) 
Due to limited flexibility 
during COVID pandemic 
• 
Section 10.7.6 
• 
Section 10.8.1 
• 
Appendix 1 
Other editorial changes have been 
made throughout 
To correct administrative 
errors and ensure content 
accuracy and consistency. 
• 
Throughout 
Revisions to Amendment 1 dated 08 October 2019 
Summary of Change  
Rationale  
Affected Protocol Sections 
Updated number of study centers 
from 8-10 to 10-15 
To be accurate with current 
study status 
• 
Synopsis 
Updated estimated date of first 
patient enrolled from 
September2019 to December2019 
To be accurate with current 
study status 
• 
Synopsis 
Updated exploratory endpoint and 
assessments to include collection of 
parenteral or tube feeding  
Parenteral/tube feeding is 
known objective way to 
evaluate esophagitis and 
secondary weight loss 
• 
Synopsis 
• 
Section 5.3 
• 
Section 10.7 
• 
Section 12.4.3 
• 
Appendix 1 

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Summary of Change  
Rationale  
Affected Protocol Sections 
Updated Inclusion Criteria #2,  
methodology section in synopsis 
and treatment plan to include more 
refined requirements for pts 
planned with intensity-modulated 
radiation therapy (IMRT)/ 
volumetric modulated arc therapy 
(VMAT) and adaptive work flows. 
 
Esophagitis risk depends on 
how high the dose exposure 
cumulatively gets, but also to 
what kind of volume this can 
be restricted. With 
introduction of 
IMRT/VMAT techniques 
dose exposure can be better 
streamlined around organs, 
however due to continuous 
movement the esophagus 
exposure stays still 
significant. To better guide 
planning with these 
modalities we introduced 
volume-based criteria (V38 
and V60), referenced in 
literature as best predictor of 
esophagitis-risk 
 
• 
Synopsis 
• 
Section 6.2 
• 
Section 7.1 
Clarifications made to pregnancy 
and contraception requirements 
In order to stress the 
pregnancy risk and reduction 
need more 
• 
Synopsis  
• 
Section 7.1 
• 
Section 7.2 
• 
Section 11.7 
Removed Exclusion Criteria #3 - 
Chemotherapy before start of 
concurrent radio-chemotherapy is 
allowed 
 
Because of logistics or 
advanced disease, sometimes 
chemotherapy is started 
before radiation therapy. The 
influence on risk of 
esophagitis is not expected to 
be important, therefore this 
exclusion has been removed. 
 
• 
Synopsis 
• 
Section 7.2 
Updated Exclusion Criteria #6 
(EC#4 in Amendment 2) to specify 
the use of electronic symptom-
reporting device 
To provide clarity on 
protocol conduct 
• 
Synopsis 
• 
Section 7.2 
Updated duration of GC4419 
treatment to cover total number of 
fractions prescribed per subject 
(vary from 30-35). 
To allow for maximum 
duration of GC4419 
administration up to 35 doses 
to cover all RT fractions 
prescribed.   
• 
Synopsis 
• 
Section 6.2 
• 
Section 8.3.4 
Updated prohibited 
medication/treatment section to 
specify timeframes 
Drug interactions are 
expected while GC4419 is 
actively given.  . 
• 
Synopsis 
• 
Section 8.2 
Added Radiation Therapy section  
To include more details on 
Radiation Therapy dose 
specifications and treatment 
planning. 
• 
Section 6.3 

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Summary of Change  
Rationale  
Affected Protocol Sections 
Updated collection time of 
information regarding concomitant 
medications from within 28 days of 
Day 1 to Baseline Day 1. 
Concomitant Medication 
information prior to baseline 
is not needed. 
• 
Section 8.1 
• 
Section 10.6 
• 
Appendix 1 
Removed reference of pain 
medication diary 
Analgesic/narcotic 
medication use will be 
captured along with other 
concomitant medications. 
• 
Section 8.1 
Updated timeframe for collection of 
narcotics to extend to 30 days post 
treatment 
To obtain additional 
information on narcotic use 
• 
Section 8.1 
Updated details for GC4419 in 
regards to use of filter and 
packaging 
For clarification and to be 
consistent with pharmacy 
manual 
• 
Section 8.3 
Updated instructions for dosing 
GC4419 relative to RT 
administration (eg. how to handle  
RT treatment breaks) 
Clarification of 
administration instructions 
• 
Section 8.3.4 
Updated Radiotherapy Quality 
Assurance (RTQA) section to 
provide additional detail 
To provide clarification on 
radiation therapy 
requirements for centers 
using VMAT/IMRT 
treatment delivery and what 
information in these plans is 
needed to assess treatment 
planning 
 
• 
Section 10.2 
Updated Patient Reported 
Outcomes (PRO) language to allow 
completion at the baseline visit 
prior to dosing if not done during 
the week prior. 
Clarification to enhance data 
capture 
• 
Section 10.4 
• 
Section 10.6 
• 
Section 10.7 
• 
Appendix 1 
Updated to only record height at the 
screening visit 
Correction as height will not 
change over time 
• 
Section 10.6 
• 
Section 10.7 
• 
Appendix 1 
Broadened window for Spirometry, 
Diffusing Capacity of the Lung for 
Carbon Monoxide (DLCO) and 
electrocardiogram (ECG) to 56 
days 
These functional tests are 
done in the diagnostic work-
up which extends up until 2 
months in general. 
• 
Section 10.6 
• 
Appendix 1 
Updated to specify administration 
sequence of study drug and other 
treatments 
Clarification 
• 
Section 10.7 
Added other important medical 
event SAE definition 
Correction 
• 
Section 11.1.2 
Updated Schedule of Assessments 
to specify that medical history 
should include NSCLC or SCLC 
cancer history including prior 
The TNM disease state will 
determinate the volumes that 
will need radiation and 
indirectly the esophagitis risk 
• 
Appendix 1 

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Summary of Change  
Rationale  
Affected Protocol Sections 
treatments and confirmation of 
histopathological diagnosis. 
Other editorial changes have been 
made throughout 
To correct administrative 
errors and ensure content 
accuracy and consistency. 
• 
Throughout 
 
Revisions to Original Protocol dated 17 April 2019 
Change  
Rationale  
Affected Protocol Sections 
Clarifications made to specify 
gemcitabine is not an allowed 
chemotherapy 
Clarification, in response to 
FDA request 
• 
Synopsis 
• 
Section 6.2 
Inclusion Criteria 6a revised to be 
based on creatinine clearance (Clcr) 
Per FDA request 
• 
Synopsis 
• 
Section 7.1 
Exclusion Criteria #7 and  
prohibited medications clarified  
Clarification, in response to 
FDA request 
• 
Synopsis 
• 
Section 7.2 
• 
Section 8.2 
Added PK sampling to determine 
GC4419 exposure in the study 
population  
Per FDA request 
• 
Synopsis 
• 
Section 6.2 
• 
Section 10.3 
• 
Section 10.7 
• 
Appendix 1 
Added “Grade 3 or greater nausea 
or vomiting” to the list of toxicities 
requiring 25% GC4419 dose 
reduction 
Per FDA request to add dose 
reduction for GC4419-
related nausea/vomiting 
• 
Synopsis 
• 
Section 9.2 
Updated instructions for other 
toxicities (including those 
attributable to chemotherapy and 
RT) 
Clarification, in response to 
FDA request 
• 
Synopsis 
• 
Section 9.2 
Inserted a section for Anticipated 
toxicities of GC4419  
Per FDA request 
• 
Section 9.1 
Added Tumor assessment 
Per FDA request 
• 
Section 10.1.4 
• 
Section 10.6 
• 
Section 10.7 
• 
Appendix 1 
Added interim safety analysis/rules 
for stopping study 
Per FDA request 
• 
Section 12.5.1 
 
 

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Galera Therapeutics, Inc. 
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1. 
SYNOPSIS 
Name of Sponsor/Company: 
Galera Therapeutics, Inc. 
Name of Investigational Product: 
GC4419 
Name of Active Ingredient: 
GC4419 (avasopasem manganese) (Manganese (II), is a water soluble, highly stable, low 
molecular weight manganese-containing macrocyclic complex whose activity mimics that of 
naturally occurring Superoxide Dismutase (SOD) enzymes.) 
Title of Study:  
A Phase 2a Open-Label Trial of the Effects of Intravenous GC4419 on the Incidence and 
Severity of Esophagitis in Subjects Receiving Chemoradiotherapy for Lung Cancer  
Number of Study Center(s): 10-15 centers in the United States 
Estimated Enrollment Period: 15-18 months 
Studied period (years):  
Estimated date first patient enrolled: December 2019 
Estimated date last patient completed assessment for 
primary endpoint: December 2021 
Phase of development: 2a 
Objectives:  
Primary: 
• 
To evaluate the incidence of acute radiation esophagitis (≥ Grade 2; National Cancer 
Institute-Common Terminology Criteria for Adverse Events [NCI-CTCAE] version 5) 
through the end of chemoradiotherapy for non-small cell lung cancer (NSCLC) and small cell 
lung cancer (SCLC) when GC4419 is added. 
Secondary: 
• 
To evaluate and compare the incidence of acute severe (Grade 3-4) radiation esophagitis by 
NCI-CTCAE scales (Grade 3-4) through the completion of chemoradiotherapy; 
• 
To evaluate and compare the incidence of acute esophagitis ≥ Grade 2, 4 weeks after 
completion of chemoradiotherapy, using the NCI-CTCAE scale; 
• 
To evaluate and compare the presence of acute severe radiation esophagitis 4 weeks after 
completion of chemoradiotherapy; 
• 
To evaluate the incidence of acute (through 90 days after radiation therapy) radiation 
pneumonitis, ≥ Grade 2 using NCI-CTCAE scale; 
• 
To evaluate the adverse events (AEs) associated with GC4419 by the NCI-CTCAE scale; 
• 
To assess weight loss (percent weight change from baseline through the completion of 
chemoradiotherapy, and 4 weeks after treatment). 

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Exploratory objectives: 
• 
To explore the trend of severity of radiation esophagitis-related pain, dysphagia, and 
dyspepsia during combined chemotherapy and radiation therapy (RT) using these fields of the 
National Cancer Institute- Common Terminology Criteria for Adverse Events-Patient 
Reported Outcome (NCI PRO-CTCAE) weekly during treatment, and 4 weeks after 
completion of chemoradiotherapy; 
• 
To evaluate the incidence of acute radiation esophagitis (≥ Grade 2; radiation therapy 
oncology group [RTOG] scale) through the end of chemoradiotherapy; 
• 
To evaluate and compare the incidence of acute esophagitis ≥ Grade 2, 4 weeks after 
completion of chemoradiotherapy, using the RTOG scale; 
• 
To assess patient-reported dysphagia via a daily patient log and collect use of parenteral or 
tube feeding due to esophagitis; 
• 
To assess opioid use by collecting the patient’s narcotic use in the previous 24-hour period at 
each weekly evaluation. 
Methodology:  
GTI-4419-203 will be an open-label, multi-center study to evaluate GC4419 administered 
intravenous (IV) for the reduction of radiation induced esophagitis in subjects receiving 
chemoradiotherapy for unresectable Stage 3 or post-operative Stage 2B NSCLC, SCLC 
treatable with chemoradiotherapy (AJCC 8th edition).  
Subjects will receive radiation therapy, delivered in once-daily fractions, 5 days/week to a 
total dose of at least 60 Gy combined with chemotherapy other than gemcitabine, per 
investigator choice.   
Subjects can be enrolled when an estimated 5cm of the esophagus is expected to be near the 
60 Gy treatment volume. 
In all subjects, the final plan should show that at least one surface of the esophagus is 
included in the 60 Gy isodose volume. Making sure that the full esophagus is contoured, the 
dose volume histogram needs to confirm high dose exposure in the range of V38>30% and/or 
V60>20%. 
Each subject will receive GC4419, 90 mg, by 60-minute IV infusion, prior to each fraction of 
RT. GC4419 should be administered so that RT is administered within 60 minutes of the end 
of the GC4419 infusion.  
Toxicity by common terminology criteria for adverse events (CTCAE), and esophagitis by 
CTCAE criteria, will be assessed at each treatment visit and 4 weeks after completion of 
treatment. Opioid use, weight loss, common terminology criteria for adverse events- patient 
reported outcome (CTCAE-PRO) fields will be assessed weekly during treatment and 4 
weeks after completion of treatment. Patient-reported swallowing diaries will be completed 
daily. To assess early pneumonitis, NCI-CTCAE scale, CT scan, spirometry, and diffusing 
capacity of the lungs for carbon monoxide (DLCO) will be assessed at the end of treatment 
and 90 days after completion of treatment. 

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PK sampling will be sought from all subjects.   
Number of Subjects (planned):  
Approximately 60 subjects with NSCLC and SCLC referred for chemoradiation 
Diagnosis and Main Criteria for Inclusion:  
Inclusion Criteria:  
1. Subjects scheduled to be treated with (definitive or adjuvant) radiation therapy in 
combination with chemotherapy once daily for pathologically confirmed Stage 3 or post-
operative Stage 2B NSCLC or limited stage SCLC.  
2. Treatment plan for subjects show that 5 cm of the esophagus for at least one surface, is 
included in the 60 Gy isodose volume.  Dose volume histograms show esophagus dose 
exposure meet V38>30% and/or V60>20%. 
 
Note:   In case the final planning shows that the contoured esophagus is close to but the 60 Gy isodose 
does not cover completely 5 cm, this subject may be allowed on the trial at the discretion of the 
principal investigator after discussion with and review by the Medical Monitor.  
 
3. Age ≥ 18 years or older 
4. Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2  
5. Adequate hematologic function as indicated by: 
a. Absolute neutrophil counts (ANC) ≥ 1,500/mm3 
b. Hemoglobin (Hgb) ≥ 9.0 g/dL 
c. Platelet count ≥ 100,000/mm3 
6. Adequate renal and liver function as indicated by: 
a. Estimated baseline creatinine clearance >60 cc/min (CrCl = (140 – Age) x Mass (kg) 
x [0.85 if female] / 72 x [Serum Creatinine (mg/dL)]) 
b. Total bilirubin ≤ 1.5 x upper normal limit (ULN) 
c. Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ 2.5 x ULN 
d. Alkaline phosphatase ≤ 2.5 x ULN  
7. Males and females must agree to use a highly effective contraception starting at least one day 
prior to the first day of treatment and continuing for 30 days after the last dose of GC4419 
(females) or 90 days (males) 
8. Properly obtained written informed consent 
Exclusion Criteria: 
1. Metastatic disease  
2. Prior radiation therapy to the region of the study cancer or adjacent anatomical sites or more 
than 25% of total body marrow-bearing area (potentially interfering with chemo-tolerance) 
3. Subjects not receiving chemotherapy 
4. Grade 2 or greater esophagitis at baseline 

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5. Inability to provide information in the electronic symptom-reporting device 
6. Subjects receiving approved or investigational immunotherapy, targeted therapy, hormone 
therapy, or biologic therapy 
7. Participation in another clinical trial or use of another investigational agent within 30 days of 
first dose of GC4419 
8. Malignant tumors other than the current lung cancer within the last 5 years, unless treated 
definitively and with low risk of recurrence in the judgment of the treating investigator  
9. Previous diagnosis of symptomatic pneumonitis (≥ Grade 2 CTCAE v 5.0 including 
immunotherapy induced pneumonitis) 
10. Untreated, active infectious disease requiring systemic anti-infective therapy 
11. Untreated HIV or history of hepatitis B/C (subjects who have been vaccinated for hepatitis B 
and do not have a history of infection are eligible) 
12. Pregnant female subjects (including positive test for pregnancy); breastfeeding/lactating 
female subjects; female subjects of child-bearing potential who are unwilling or unable to use 
a highly effective method of contraception as outlined in this protocol 
13. Known allergies or intolerance to chemotherapy and similar platinum-containing compounds 
14. Requirement for concurrent treatment with nitrates  
15. Requirement for treatment with drugs other than nitrates that may, in the judgment of the 
treating investigator, create a risk for a precipitous decrease in blood pressure. 
16. Clinically significant heart disease (eg, congestive heart failure of New York Heart 
Association Class 3 or 4, angina not well controlled by medication, or myocardial infarction 
within 6 months) 
Investigational Product, Dosage and Mode of Administration:  
GC4419 is formulated as a sterile solution at a concentration of 9 mg/mL in 26 mM sodium 
bicarbonate-buffered 0.9 wt. % sodium chloride for parenteral administration (drug product). 
GC4419 will be presented in single use vials. Vials will be filled with 11 mL ± 0.1 mL of 
GC4419, of which 10 mL be added into a 250 mL bag of normal saline, for daily IV 
administration over 60 minutes.   
Duration of Treatment:  
Approximately 30 doses, covering the total number of fractions of the prescribed radiation 
therapy (to a maximum of 35 doses) on days in which RT is administered, Monday-Friday, 
for approximately 6 weeks. GC4419 should be administered so that RT is administered 
within 60 minutes of the end of the GC4419 infusion. 
Reference Therapy, Dosage and Mode of Administration:  
Not applicable   
Clinical Laboratory Assessment: A central laboratory vendor will be utilized. 

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Criteria for Evaluation: 
• 
NCI-CTCAE, version 5.0, for Adverse Events and esophagitis  
• 
NCI PRO-CTCAE fields for pain, dysphagia, and dyspepsia  
• 
Numerical Pain Rating Scale for esophagitis pain 
• 
For evaluation of pneumonitis: 
o NCI-CTCAE criteria version 5.0 
o Spirometry 
o DLCO 
o CT scanning 
Safety Monitoring and Toxicity Management: 
Adverse/Serious Adverse Event (SAE) assessments per CTCAE version 5.0 and GCP 
standards  
Toxicity requiring 25% GC4419 dose reduction: 
• 
Grade 2 or greater hypotension occurring within one hour of the end of GC4419 
infusion 
• 
Grade 3 or greater nausea or vomiting 
• 
The dose of GC4419 may be reduced by 25% for Grade 3-4 AEs judged by the 
Investigator to be likely attributable to the study infusion. 
• 
Subject to the judgment of the treating investigator, GC4419 dosing should be 
interrupted or reduced according to the provisions of this section as necessary for 
toxicities potentially attributable to either GC4419 or chemoradiotherapy.  
Two dose reductions for toxicity will be permitted per patient. Subjects unable to tolerate 
GC4419 after two dose reductions must discontinue treatment with the study drug GC4419 
but should continue with standard chemoradiotherapy at the discretion of the treating 
investigator. 
Toxicities including those attributable to chemotherapy and RT) should also be managed per 
institutional and American Society of Clinical Oncology (ASCO) guidelines and investigator 
judgment. 
Esophagitis will NOT be considered an AE requiring dose modification for the purposes of 
this study. 
Concomitant Medications/Treatments: 
Investigators may prescribe any concomitant medication or supportive therapy deemed 
necessary to provide adequate supportive care. Supportive care includes antiemetic 
prophylaxis, hematopoietic growth factor used per ASCO guidelines, systemic antibiotics, 

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hydration to prevent renal damage etc., consistent with local standard of practice, with the 
following exceptions:  
Prohibited medications/treatments: 
• Gemcitabine 
• Nitrates, phosphodiesterase type 5 (PDE 5) inhibitors (eg, sildenafil, tadalafil, or 
similar agents) or other drugs that in the judgment of the treating investigator could 
create a risk of a precipitous decrease in blood pressure are prohibited until at least 24 
hours after the last dose of GC4419  
• Other biologic response modifiers – except systemic hematopoietic growth factors for 
the management of anemia or myelosuppression  
• Concurrent approved or investigational immunotherapy, targeted therapy, hormone or 
biologic therapy.  
• Concurrent investigational agents intended to reduce mucosal toxicity of radiation 
therapy 
• Other investigational agents 
All medication restrictions end after the 4-week post RT follow-up visit is completed unless 
otherwise noted. 
Concomitant use of GC4419 increases the concentration of drugs that are CYP2D6 
substrates, which may increase the risk of toxicities of these drugs. Avoid concomitant use of 
GC4419 with CYP2D6 substrates where minimal increases in concentration of the CYP2D6 
substrate may lead to serious or life-threatening toxicities (substrates with a narrow 
therapeutic range). 
Statistical Considerations: 
The incidence of ≥ Grade 2 esophagitis will be summarized and compared descriptively with 
historical controls based incidence rate of  30% incidence (Fogh 2017, Kwint 2012, Palma 
2013) for chemoradiotherapy alone (range in literature since 2010; 18-42%). Percentages and 
95% confidence intervals will be calculated and a binomial test performed. 
A dropout/in evaluable rate of 10% is assumed, leading to an overall target enrollment of 
approximately 60 subjects to yield 55 who either complete treatment or are known to have 
had esophagitis before discontinuation. 
For illustration, if the true incidence of ≥ Grade 2 esophagitis in GC4419-treated subjects is 
13%, the trial will have roughly 80% power with 55 subjects in the analysis to demonstrate 
incidence lower than 30% with a one-sided Type I error rate of 2.5%. 

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2. 
TABLE OF CONTENTS, LIST OF TABLES, AND LIST OF 
FIGURES  
CLINICAL STUDY PROTOCOL ..................................................................................................1 
1. 
SYNOPSIS ...............................................................................................................................7 
2. 
TABLE OF CONTENTS, LIST OF TABLES, AND LIST OF FIGURES ...........................13 
3. 
LIST OF ABBREVIATIONS AND DEFINITIONS OF TERMS.........................................17 
4. 
INTRODUCTION ..................................................................................................................19 
4.1. 
Background ........................................................................................................................19 
4.1.1. 
Mechanisms of Mucositis and the Role of Superoxide in its Initiation .......................19 
4.1.2. 
Radiation Esophagitis ..................................................................................................20 
4.1.2.1. 
Assessment of Esophagitis and Esophagitis-related Pain ......................................20 
4.1.2.2. 
Incidence of Radiation Esophagitis in Lung Cancer ..............................................21 
4.1.2.3. 
Prevention of Radiation Esophagitis ......................................................................22 
4.2. 
GC4419 ..............................................................................................................................24 
4.3. 
Rationale for the Present Trial ...........................................................................................25 
5. 
TRIAL OBJECTIVES AND PURPOSE ................................................................................26 
5.1. 
Primary Objective ..............................................................................................................26 
5.1.1. 
Rationale for Primary Endpoint ...................................................................................26 
5.2. 
Secondary Objectives.........................................................................................................26 
5.3. 
Exploratory Objectives ......................................................................................................26 
6. 
INVESTIGATIONAL PLAN .................................................................................................27 
6.1. 
Overall Study Design .........................................................................................................27 
6.2. 
Treatment Plan and Duration of Therapy ..........................................................................27 
6.2.1. 
Rationale for GC4419 Dose and Schedule Selection ..................................................28 
6.3. 
Radiation Therapy ..............................................................................................................28 
6.3.1. 
Radiation Therapy Dose Specifications .......................................................................28 
6.3.2. 
Localization, Simulation, and Immobilization.............................................................28 
6.3.3. 
Target Volumes ............................................................................................................29 
6.3.4. 
Treatment Planning ......................................................................................................30 
6.3.5. 
Critical Structures ........................................................................................................31 
6.3.6. 
Documentation Requirements ......................................................................................31 
6.3.7. 
Compliance Criteria .....................................................................................................32 
7. 
SELECTION AND WITHDRAWAL OF SUBJECTS ..........................................................33 
7.1. 
Subject Inclusion Criteria ..................................................................................................33 
7.2. 
Subject Exclusion Criteria .................................................................................................34 
7.3. 
Rationale for Patient Population ........................................................................................34 
7.4. 
Screen Failures ...................................................................................................................35 
7.5. 
Subject Withdrawal Criteria ..............................................................................................35 
7.6. 
Study and Site Closure .......................................................................................................35 
8. 
INVESTIGATIONAL PRODUCT AND TREATMENT OF SUBJECTS ...........................37 

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8.1. 
Concomitant Medications ..................................................................................................37 
8.1.1. 
Drug Interactions .........................................................................................................37 
8.2. 
Prohibited Medications ......................................................................................................38 
8.3. 
Description of Study Drug (GC4419) ................................................................................38 
8.3.1. 
GC4419 Drug Packaging and Labeling .......................................................................39 
8.3.2. 
Study Drug Storage ......................................................................................................39 
8.3.3. 
Study Drug Preparation................................................................................................39 
8.3.4. 
Administration .............................................................................................................39 
8.3.5. 
Accountability and Compliance ...................................................................................40 
8.3.6. 
Study Drug Handling and Disposal .............................................................................40 
9. 
TOXICITY MANAGEMENT ................................................................................................42 
9.1. 
Anticipated toxicities of GC4419 ......................................................................................42 
9.2. 
Dose Delays and Dose Modifications for Toxicity............................................................42 
9.3. 
Supportive Care Guidelines ...............................................................................................43 
9.3.1. 
Supportive Care for Chemotherapy-induced Nausea and Vomiting ...........................43 
10. ASSESSMENTS.....................................................................................................................44 
10.1. Safety Assessments ............................................................................................................44 
10.1.1. 
Clinical Assessments ...................................................................................................44 
10.1.2. 
Laboratory Assessments ..............................................................................................44 
10.1.3. 
Pneumonitis Assessment ..............................................................................................45 
10.1.4. 
Tumor Assessment .......................................................................................................45 
10.2. Radiation Therapy Quality Assurance ...............................................................................46 
10.3. Pharmacokinetic (PK) Measurements ................................................................................46 
10.3.1. 
Pharmacokinetic (PK) Measurements of GC4419 .......................................................46 
10.4. Patient Reported Outcomes (PRO) and Diaries .................................................................47 
10.4.1. 
Patient Reported Outcomes (PROs).............................................................................47 
10.4.2. 
PRO-swallowing Diary ................................................................................................47 
10.4.3. 
Pain Medication ...........................................................................................................47 
10.5. Schedule of Time and Events ............................................................................................47 
10.6. Screening Phase .................................................................................................................48 
10.7. Active Phase.......................................................................................................................49 
10.7.1. 
Baseline/Day 1 (First Day of RT and GC4419)...........................................................49 
10.7.2. 
Week 1 of RT and GC4419 .........................................................................................49 
10.7.3. 
Weeks 2, 3, 5, and 6 (and additional RT weeks if needed) ..........................................50 
10.7.4. 
Week 4 .........................................................................................................................50 
10.7.5. 
Last Day of RT or Early Termination Visit .................................................................51 
10.7.6. 
4 Weeks Post-RT .........................................................................................................51 
10.8 
Post Active Phase ...............................................................................................................52 
10.8.1 
 90 Days Post-RT .........................................................................................................52 
10.8.2 
 6 months, 9 months and 1-year post-RT (±30 days) ...................................................52 
11. ADVERSE EVENTS AND SERIOUS ADVERSE EVENTS ..............................................53 

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11.1. Definitions..........................................................................................................................53 
11.1.1. 
Adverse Event (AE) .....................................................................................................53 
11.1.2. 
Serious Adverse Event (SAE) ......................................................................................53 
11.2. Adverse Event Reporting Requirements ............................................................................54 
11.2.1. 
Serious Adverse Events ...............................................................................................54 
11.2.2. 
All Adverse Events (AEs) Regardless of Seriousness .................................................54 
11.2.3. 
Clinical Laboratory Abnormalities and Other Abnormal Assessments as AEs 
and SAEs ....................................................................................................................54 
11.2.4. 
Disease-related Events and/or Disease-related Outcomes Not Qualifying as 
SAEs ...........................................................................................................................55 
11.2.5. 
Grading of Adverse Events ..........................................................................................55 
11.3. Relationship to Study Drug ................................................................................................56 
11.4. Recording Adverse Events .................................................................................................57 
11.5. Follow-up of AEs and SAEs ..............................................................................................57 
11.6. Post-Study Reporting Requirements ..................................................................................58 
11.7. Pregnancy ...........................................................................................................................58 
11.7.1. 
Time Period for Collecting Pregnancy Information ....................................................59 
11.7.2. 
Action to be Taken if Pregnancy Occurs in a Female Partner of a Male Patient ........59 
11.8. Regulatory Reporting of Adverse Events ..........................................................................59 
12. STATISTICS ..........................................................................................................................60 
12.1. General Considerations ......................................................................................................60 
12.2. Sample Size ........................................................................................................................60 
12.3. Analysis Populations ..........................................................................................................60 
12.4. Definition of Endpoints......................................................................................................60 
12.4.1. 
Primary Endpoint .........................................................................................................60 
12.4.2. 
Secondary Efficacy Endpoints .....................................................................................60 
12.4.3. 
Exploratory Endpoints .................................................................................................61 
12.5. Safety Analysis ..................................................................................................................61 
12.5.1. 
Interim Safety Analysis/Study Stopping Rules............................................................61 
12.6. Primary Efficacy Analysis .................................................................................................62 
12.6.1. 
Multiplicity ..................................................................................................................62 
12.6.2. 
Handling of Missing Data ............................................................................................62 
12.7. Secondary Efficacy Analyses ............................................................................................62 
12.7.1. 
Incidence Endpoints .....................................................................................................62 
12.7.2. 
Percentage Weight Change from Baseline Through the End of Treatment and 
4 Weeks After Treatment ............................................................................................62 
13. DIRECT ACCESS TO SOURCE DATA/DOCUMENTS.....................................................63 
13.1. Study Monitoring ...............................................................................................................63 
13.2. Audits and Inspections .......................................................................................................63 
13.3. Protocol Compliance ..........................................................................................................63 
13.4. Protocol Modifications.......................................................................................................64 

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13.5. Information Disclosure ......................................................................................................64 
13.5.1. 
Ownership ....................................................................................................................64 
13.5.2. 
Confidentiality .............................................................................................................64 
13.5.3. 
Publication ...................................................................................................................64 
14. QUALITY CONTROL AND QUALITY ASSURANCE .....................................................65 
15. ETHICS ..................................................................................................................................66 
15.1. Ethical Conduct of the Study .............................................................................................66 
15.2. Institutional Review Board (IRB)/Independent Ethics Committee (IEC)/Research 
Ethics Board (REB) Approval .........................................................................................66 
15.3. Written Informed Consent .................................................................................................66 
16. DATA HANDLING AND RECORDKEEPING ...................................................................67 
16.1. Case Report Forms .............................................................................................................67 
16.2. Retention/Inspection of Records ........................................................................................67 
17. LIST OF REFERENCES ........................................................................................................68 
APPENDIX 1. 
SCHEDULE OF ASSESSMENTS ..................................................................72 
APPENDIX 2. 
ESOPHAGITIS NCI-CTCAE & RTOG SCORING .......................................74 
APPENDIX 3. 
PERFORMANCE STATUS CONVERSION .................................................75 
APPENDIX 4. 
NATIONAL CANCER INSTITUTE-COMMON TERMINOLOGY 
CRITERIA FOR ADVERSE EVENTS, VERSION 5.0 ........................................................76 
APPENDIX 5. 
NUMERIC PAIN RATING SCALE ...............................................................77 
APPENDIX 6. 
PATIENT SWALLOWING DIARY ...............................................................78 
APPENDIX 7. 
EXAMPLES OF CYP2D6-SUBSTRATE DRUGS ........................................79 
 
LIST OF TABLES 
Table 1. 
Abbreviations and Specialist Terms ......................................................................17 
Table 2. 
Esophagitis Grading Scales NCI-CTCAE & RTOG .............................................21 
Table 3 
Pharmacokinetic Sampling Schedule to Assess GC4419 ......................................47 
Table 4. 
Adverse Event Severity..........................................................................................56 
 

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3. 
LIST OF ABBREVIATIONS AND DEFINITIONS OF TERMS 
The following abbreviations and specialist terms are used in this study protocol. 
Table 1. 
Abbreviations and Specialist Terms  
Abbreviation or Specialist Term 
Definition 
4DCT 
Four-dimensional computed tomography 
ADL 
activities of daily living 
AE 
adverse event 
ALT 
alanine aminotransferase 
ANC 
absolute neutrophil count 
ASCO 
American Society of Clinical Oncology 
AST 
aspartate aminotransferase 
BED 
biologically equivalent dose 
BID 
twice a day 
BUN 
blood urea nitrogen 
BSA 
body surface area 
CAT 
computerized axial tomography 
CINV 
chemotherapy-induced nausea and vomiting 
CRF 
case report form 
CRT 
chemoradiation therapy 
CT 
computerized tomography 
CTCAE 
Common Terminology Criteria for Adverse Events 
CTV 
clinical target volume (consisting of gross tumor 
volume plus margin for microscopic disease presence)  
DLCO 
diffusing capacity of the lungs for carbon monoxide 
Dmax 
maximum dose 
Dmean 
mean dose 
DVH 
dose-volume histogram 
ECG 
electrocardiogram 
ECOG 
Eastern Cooperative Oncology Group 
FDA 
Food and Drug Administration 
GCP 
Good Clinical Practice 
GTV 
gross tumor volume 
iGTV 
interpolated gross tumor volume (representing the 
extension of geographies of this tumor volume during 
a respiratory cycle) 

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Abbreviation or Specialist Term 
Definition 
Hgb 
hemoglobin 
ICF 
informed consent form 
ICH 
International Council for Harmonisation 
IEC 
Independent Ethics Committee 
IMRT 
intensity-modulated radiation therapy 
IND 
Investigational New Drug 
IRB 
Institutional Review Board 
IV 
intravenous 
ITV 
Internal target volume (consists of an internal margin 
added to the CTV to compensate for internal 
physiologic movement and variations in size, shape, 
and position of the CTV) 
LD50 
median lethal dose 
MASCC 
Multinational Association of Supportive Care in 
Cancer 
NSCLC 
non-small cell lung cancer 
NCI 
National Cancer Institute 
NPRS 
numeric pain rating scale 
OM 
oral mucositis 
PDE 
phosphodiesterase type 5 
PK  
Pharmacokinetic 
PRO 
Patient Reported Outcome 
PTV 
planning target volume 
REB 
Research Ethics Board 
ROS 
Reactive Oxygen Species 
RT 
radiation therapy 
RTOG 
Radiation Therapy Oncology Group 
SAE 
serious adverse event 
SCLC 
small cell lung cancer 
SOD 
superoxide dismutase 
SOM 
severe oral mucositis 
TPN 
total parenteral nutrition 
ULN 
upper limit of normal 
VMAT 
volumetric modulated arc therapy (rotational IMRT) 
WHO 
World Health Organization 

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4. 
INTRODUCTION 
4.1. 
Background 
4.1.1. 
Mechanisms of Mucositis and the Role of Superoxide in its Initiation 
Mucositis is the inflammatory disruption of an area of the normal surface epithelium of an organ. 
Terms for mucositis in individual organs include dermatitis, head and neck mucositis, 
esophagitis, enteritis, proctitis, and cystitis. Mucositis in all of these sites has a common 
pathway, allowing information from one area of study, such as mucositis of the head and neck, to 
be translatable to another area, such as esophagitis. 
Mucositis can be modeled on a tissue scale and on a sub-cellular scale. The commonly accepted 
model of mucositis on the tissue scale is that of (Sonis 1998). This model functions best to 
highlight the temporal effects, rather than the mechanistic effects, involved in tissue damage and 
healing. The model has 5 phases: Initiation, Damage, Inflammation, Ulceration, and Healing. 
Mucositis modifiers can be classified by where they intervene in the model. Radioprotectors 
work by decreasing the damage from the ionizing radiation. Anti-inflammatory agents such as 
non-steroidal anti-inflammatory drugs would inhibit inflammation, and antifungal agents would 
intervene in the ulceration phase, by preventing superinfection. A growth factor such as 
keratinocyte growth factor-alpha (palifermin) would stimulate epithelial regrowth during 
Phase 5. However, many of the cytokines and growth factors, like palifermin, involved in the 
normal mucosal healing response are the same compounds that induce growth and spread of 
tumors. 
The tissue-scale model, although enlightening on a macroscopic level, gives no insight into the 
complexities of the cellular/subcellular mechanisms involved in the induction and resolution of 
mucositis. Superoxide (O2•-) plays a central role in initiation of the process (Murphy 2008). 
Under normal circumstances O2•- is a by-product of mitochondrial cellular respiration and is also 
produced by activated phagocytes. Since O2•- is extremely reactive with biological molecules, it 
is quite toxic to cells. In all studied species, this potentially toxic O2•- burden is normally 
contained by a complement of superoxide dismutase (SOD) enzymes. In vertebrates, SOD 
enzymes are present in the cytoplasm (SOD1 Cu/Zn based), mitochondria (SOD2, Mn based) 
and extracellular spaces (SOD3, Cu/Zn based). Superoxide dismutase are a class of 
oxidoreductase enzymes that convert superoxide into molecular oxygen and hydrogen peroxide.  
The control of the free radical flux derived from oxygen is jeopardized in many circumstances in 
which superoxide production is excessive or if the breakdown of superoxide is compromised. 
This over-production of superoxide can overwhelm the body’s ability to eliminate it via catalytic 
dismutation and lead to a variety of superoxide initiated or mediated disease states, including 
mucositis. 
Ionizing radiation damages cells by transferring sufficient energy to intracellular atoms or 
biomolecules to modify their normal properties and functions. Since approximately 70% of an 
average cell consists of water, radiolytic hydrolysis is by far the primary triggering event 
following the exposure of cells and tissues to ionizing irradiation (eg, as in radiation therapy 
[RT] for the treatment of cancer).  

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Radiolytic hydrolysis leads to the formation of reactive oxygen species (ROS), including 
predominantly superoxide. Normal cells in the radiation field counter these damaging effects by 
detoxifying ROS via their intact redox protective enzyme systems (SOD, catalase, glutathione 
peroxidase), converting hydrogen peroxide into water and molecular oxygen, and by the 
activation of DNA repair mechanisms. In cancer cells, it has been suggested that exogenous SOD 
and SOD mimetics, by reducing intracellular superoxide (a proliferation trigger) and increasing 
hydrogen peroxide (an apoptosis trigger) shifts the critical cellular redox balance reducing the 
proliferative drive and increasing the apoptotic drive.  
Recent research has demonstrated that the pathogenesis of mucositis involves more than just 
direct clonogenic cell death induced non-specifically on rapidly dividing basal epithelial cells. 
Rather, basal epithelial cell death is mediated by a wide range of mechanistic pathways; at least 
14 canonical pathways have been identified as being involved in mucosal treatment toxicities. 
The generation of ROS by chemoradiotherapy, for example, leads to signaling pathways in the 
submucosa that then target the epithelium and result in loss of epithelial renewal and the 
development of ulceration. Reactive oxygen species, and in particular superoxide, are believed to 
play a central role in the initiation of tissue injury and up-regulation of inflammatory cytokines, 
with subsequent signal amplification and mucosal inflammation and ulceration. Furthermore, 
differences in polymorphisms that encode for glutathione S-transferase, an enzyme that provides 
protection from ROS, have been associated with increased risk for radiation- and 
chemotherapy-induced injury to both the oral mucosa and skin.  
Taken as a whole, this suggests that an agent that efficiently and rapidly removes superoxide 
offers a treatment paradigm for or controlling oral mucositis (OM). Numerous published studies 
indicate that mucositis, esophagitis, pneumonitis, fibrosis, or other normal-tissue radiation 
damage may be reduced by treatment with liposomally encapsulated exogenous MnSOD or a 
MnSOD transgene, exogenous Cu/Zn SOD, or a dismutase mimetic enantiomerically related to 
GC4419. 
4.1.2. 
Radiation Esophagitis 
4.1.2.1. 
Assessment of Esophagitis and Esophagitis-related Pain 
Radiation esophagitis is the most common dose-limiting toxicity associated with the treatment of 
lung cancer with chemoradiation therapy (CRT) (Baker 2016). Chemoradiation therapy-induced 
esophagitis may affect an individual’s ability to eat/swallow and in some instances may require 
hospitalization or parenteral feeding (National Cancer Institute 2017). More severe cases of acute 
CRT-induced esophagitis may include life-threatening complications such as stricture, 
ulceration, perforation, or fistula (Radiation Therapy Oncology Group/European Organisation 
for Research and Treatment of Cancer [RTOG/EORTC] 2019) (Table 2). 
 

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Table 2. 
Esophagitis Grading Scales NCI-CTCAE & RTOG 
Grade 
NCI-CTCAE 
RTOG 
1 
Asymptomatic; clinical or diagnostic 
observations only; intervention not 
indicated 
Mild dysphagia/odynophagia 
Topical anesthetics, non-narcotic agents, or soft diet 
might be needed 
2 
Symptomatic; altered eating/swallowing; 
oral supplements indicated 
Intermediate dysphagia/odynophagia 
Narcotic agents or pure liquid diet might be needed 
3 
Severely altered eating/swallowing; tube 
feeding, TPN or hospitalization indicated 
Severe dysphagia/odynophagia 
Dehydration or weight loss > 15% 
Nasogastric tube might be required for nutrition  
4 
Life-threatening consequences; urgent 
operative intervention indicated 
Complete obstruction, ulceration, perforation/fistula 
5 
Death 
Death 
NCI-CTCAE = National Cancer Institute- Common Terminology Criteria for Adverse Events, 
RTOG/EORTC = Radiation Therapy Oncology Group/European Organisation for Research and Treatment of 
Cancer, TPN = total parenteral nutrition. 
Sources: NCI-CTCAE 5.0 (2017); RTOG/EORTC (2019). 
4.1.2.2. 
Incidence of Radiation Esophagitis in Lung Cancer 
The incidence of severe acute esophagitis in subjects treated for lung cancer with standard RT 
alone depends on esophageal RT dose and is markedly higher when radiation and chemotherapy 
are combined, when chemotherapy is concurrent with RT, and when RT is given twice daily 
(hyper fractionated) or by an accelerated fractionation (eg, 6 days/week) regimen:  
• Vokes 2002 reported 49% rate of grade 3 or higher esophagitis with concurrent 
gemcitabine and thoracic RT.  
• In a Phase 3 study conducted by Ball 1995, which examined 100 subjects with non-small 
cell lung cancer (NSCLC), the duration of symptomatic esophagitis was 1.4 months 
(mos.) in the conventional RT arm, 1.6 months. In the conventional RT arm with 
concurrent carboplatin, 3.2 months. In the accelerated arm, and 2.4 months. In the 
accelerated RT plus carboplatin arm.  
• Byhardt 1998 looked at toxicity in 5 RTOG trials using sequential and or concurrent 
chemotherapy with RT for advanced NSCLC. They found that hyperfractionated RT to a 
total dose of 69.6 Gy was associated with a 24%-34% incidence of severe esophagitis.  
• The CHART regimen (Continuous Hyperfractionated Accelerated Radiation Therapy), 
given without chemotherapy for locally advanced NSCLC, resulted in a 19% rate of 
severe esophagitis (Emami 1996).  
• Concomitant boost technique with concurrent chemotherapy also resulted in a 
dose-limiting incidence of esophagitis of 33% (Xiao 2004).  
• The Eastern Cooperative Oncology Group (ECOG) trial of once-a-day versus twice-a-day 
RT with concurrent cisplatin and etoposide for small cell lung cancer (SCLC) showed a 
survival advantage for twice-a- day radiation but at the expense of increased esophagitis. 
Specifically, 56% of subjects in the once-daily arm did not experience esophagitis vs. 
only 37% of subjects in the twice-daily arm. Moreover, the rates of Grade 3 esophagitis 

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(defined as an inability to swallow solids, requiring narcotic analgesics, or the use of a 
feeding tube) were 11% the once-daily arm versus 27% in the twice-daily arm 
(Turrisi 1999). 
• In the Locally Advanced Multimodality Protocol (LAMP) study (Belani 2005), 
esophagitis was > National Cancer Institute (NCI) Grade 3 in 19% to 28% of subjects 
receiving 63 Gy of RT by standard fractionation plus concurrent carboplatin and 
paclitaxel.   
• In RTOG 9801, the rate of > Grade 3 esophagitis was 30% to 34% with hyperfractionated 
RT (69.6 Gy in 1.2 Gy fractions twice a day [BID]) plus concurrent carboplatin and 
paclitaxel (Movsas 2005).   
• In RTOG 9410, the rate of > Grade 3 esophagitis for RT plus concurrent cisplatin-based 
chemotherapy was 23% with standard fractionation RT (63 Gy in 34 fractions) and 45% 
with hyperfractionated RT (69.6 Gy in 1.2 Gy fractions BID) (Curran 2011). 
• In RTOG 1012, a randomized, placebo-controlled, double blind trial in subjects receiving 
CRT that included standard fractionation RT of least 60 Gy delivered to at least 5 cm of 
the esophagitis, 12.5% of subjects in the placebo arm developed NCI/RTOG Grade 3 
esophagitis (Fogh 2017). (The trial failed to demonstrate a beneficial effect for Manuka 
honey to reduce esophagitis.)  
However, more recently, the RTOG 0617 trial of carboplatin/paclitaxel +/- cetuximab with 
standard fractionation RT to either 60 Gy or 74 Gy reported 7% esophagitis > Grade 3 for the 
60 Gy arm vs 21% for the higher RT dose (Bradley 2015). While cross study-comparisons are 
challenging, this raises the possibility that contemporary refinements to RT technique for 
NSCLC may be substantially reducing the incidence of the most severe radiation esophagitis. 
However, in the same studies, the rate of ≥ Grade 2 esophagitis was approximately 30% (Kwint 
2012, Palma 2013). 
4.1.2.3. 
Prevention of Radiation Esophagitis  
The classical, two-dimensional fields used in RT for lung cancer include the primary lesion, 
ipsilateral hilum, bilateral mediastinum, and often ipsilateral supraclavicular region, establishing 
elective nodal irradiation as a standard approach. The current trend is for smaller, tighter fields 
frequently encompassing only the grossly visible tumor or positron emission 
tomography -positive tumor with a small margin (such an approach was used in RTOG 0617). 
The benefits include less irradiated lung volume and a shorter length of irradiated esophagus, 
which is assumed to decrease the probability of esophageal toxicity. This concept stems from 
reports that doubling the length of irradiated portion of the esophagus leads to a decrease of the 
LD50 dose, or dose causing the death of 50% of irradiated animals (Michalowski 1986). 
However, the evidence that esophageal toxicity is minimized with shorter esophageal length 
irradiated is contradictory (Werner-Wasik 2000; Choy 1999; Langer 1999; Ball 1995). 
In animal models, amifostine had been demonstrated to increase the amount of radiation that can 
be delivered before reaching mean lethal doses (LD50) from approximately 38.0 Gy to 60.0 Gy, 
achieving an overall Protection Factor of 1.5-1.6 for both acute and chronic esophageal damage 
(Ito 1986). Improved esophagitis with amifostine in Phase 2 and 3 trials have been noted in 
subjects with NSCLC receiving thoracic RT, with or without concurrent chemotherapy 
(Werner-Wasik 2001; Werner-Wasik 2002; Koukourakis 1996; Antonadou 2001; 

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Antonadou 2002). In a randomized Phase 3 trial, Antonadou 2001 examined 146 subjects with 
lung cancer treated with thoracic RT who received daily infusion of amifostine (340 mg/m2) or 
no amifostine. They noted grade 2 or higher acute esophagitis in 32/72 RT subjects vs. 6/72 in 
amifostine/RT subjects (p < 0.001). In the subsequent study of chemoradiotherapy for lung 
cancer, a similarly significant decrease in esophagitis was observed (88% vs. 47%) 
(Antonadou 2002). 
In contrast to these previous findings, RTOG 98-01 (Movsas 2005), a Phase 3 randomized study 
of amifostine for esophagitis prevention examined 243 subjects with locally advanced NSCLC 
who received 2 courses of induction chemotherapy (carboplatin and paclitaxel) followed by 
concurrent twice-daily thoracic RT and weekly low-dose carboplatin and paclitaxel. Subjects 
were randomized to receive amifostine or no amifostine. Amifostine did not demonstrate a 
reduction in severe esophagitis (30% rate with amifostine vs. 34% without); however, based on 
patient diaries, the swallowing dysfunction measured over time was significantly lower with 
amifostine (p = 0.03). In this trial, only 40% of all RT fractions were “protected” by amifostine 
infusion in that study and only 29% of subjects received amifostine according to protocol 
requirements. It is unwise to conclude that poor patient compliance was necessarily why the 
amifostine failed to show efficacy; it is equally likely that the poor compliance was because the 
amifostine was not sufficiently beneficial. 
The use of non-steroidal compounds to prevent radiation esophagitis also has been studied. 
Neither indomethacin nor naproxen showed significant efficacy in small randomized trials 
(Milas1992; Nicolopoulos 1985). Non-randomized trials have shown an apparent efficacy of 
granulocyte-macrophage colony-stimulating factor and glutamine, and preclinical studies suggest 
that administration of manganese superoxidedismutase-plasmid/liposome prior to radiation 
inhibits esophagitis (Algara 2007; Epperly 2004; Koukourakis 1999). 
The NRG Oncology RTOG group conducted a trial (RTOG 1012) of Manuka honey to reduce 
the pain experienced by subjects receiving concurrent RT to at least 60 Gy plus chemotherapy. 
Manuka honey failed to demonstrate a significant improvement in that trial (Fogh 2017). One 
third of patients experienced ≥ Grade 2 esophagitis, which was taken in this study as our 
estimated incidence expected without GC4419.  
In this trial, we follow the same inclusion criteria as in RTOG 1012, selecting those subjects with 
the highest esophagitis risk, according to the dose-volume exposure of the esophagus as 
described in this trial. We know that in RTOG 1012 only half of the patients were planned with 
modulated (rotational) techniques, whereas we expect more than 75% of subjects treated in this 
more restrictive manner. Dose-volume parameters are collected with care to address esophagitis 
risk directly to esophagus exposure, rather than general treatment. 
The impact of radiation planning (IMRT vs. 3D) on incidence of esophagitis depends on the total 
volume of disease that needs to be treated and the proximity to the esophagus. Kwint et al 
described dose volume relations being of impact, rather than the technique used in stage 3 
disease (Kwint 2012). In series scoring esophagitis, while using modulated planning incidence of 
radiotherapy combined with platin-based chemotherapy, still an incidence of grade 3 of 
approximately 20% and grade 2 of 38% was reported (Palma 2013, Kwint 2012). 

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4.2. 
GC4419 
GC4419 is a novel, highly stable manganese-containing macrocyclic complex with a molecular 
weight of 483, whose activity mimics that of naturally occurring SOD enzymes. It is therefore a 
prototype of a new class of drugs termed selective SOD mimetics.   
The mechanism of action and nonclinical pharmacology of GC4419 suggest that it has the 
potential to be a radiation protectant for a variety of normal tissues, including the oral mucosa, 
esophageal mucosa, and lung.  
GC4419 selectively removes superoxide without reacting with other ROS, including nitric oxide, 
hydrogen peroxide, and peroxynitrite. Preclinical data identify GC4419 as a promising new 
radiomodulatory agent. GC4419 demonstrated a dose-related reduction in the number of days of 
severe mucositis in a hamster cheek-pouch model of OM, and protected other normal tissues 
(gastrointestinal mucosa, lung) from the toxicity of radiation in animal models, while also 
demonstrating mechanism-related synergy with high-dose fraction RT.  
GC4419 is being developed for the initial indication of “Reduction of the incidence and severity 
of SOM induced by RT, with or without systemic therapy" under Investigational New Drug 
111,539 with the Division of Dermatology and Dental Products, United States Food and Drug 
Administration (FDA). 
In a Phase 1b/2a trial, GC4419 demonstrated an acceptable safety profile at doses up to 112 mg, 
administered on weekdays prior to scheduled standard-fractionation RT plus concurrent cisplatin 
for the treatment of 46 subjects with locally advanced, squamous cell carcinoma of the oral 
cavity or oropharynx. Separate cohorts of subjects received GC4419 to cover 3 weeks to the full 
7 weeks of RT. The maximum tolerated dose of GC4419 was not reached in that trial. Dose 
limiting toxicities in 2 of 18 subjects receiving the top dose of 112 mg were NCI Grade 3 
gastroenteritis and Grade 3 vomiting in one patient each. Forty-three of the subjects were 
evaluable for OM. The OM evaluations indicated that, compared with historical expectations: 
• The overall incidence of severe (World Health Organization [WHO] Grade 3 or 4) OM 
appeared reduced; 
• Severity of OM (specifically, Grade 4 OM) appeared to be lowered; 
• Onset of SOM appeared delayed; 
• Duration of SOM appeared reduced. 
In general, efficacy to reduce the incidence and severity of OM appeared greatest when GC4419 
was administered throughout the full RT dosing period. However, there was not a clear 
relationship between absolute daily dose and OM results. 
In a 223-patient 3-arm, dose-randomized, placebo-controlled, double-blind Phase 2 trial of 
GC4419 in a similarly-defined and treated patient population, a 90 mg dose of GC4419 
demonstrated a significant and clinically meaningful reduction in SOM duration, as assessed on 
the entire randomized population, and also reduced the incidence of SOM during the study 
treatment period by approximately one-third, compared with placebo. The safety profile in the 
active GC4419 arms was similar to that in the placebo arm, indicating that GC4419 does not 

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increase the known toxicity of the background, standard intensity-modulated radiation 
therapy/cisplatin treatment. A confirmatory Phase 3 trial is planned with the 90 mg dose of 
GC4419.   
The mechanism of mucosal injury induced by chemoradiotherapy, and of GC4419 to protect 
normal mucosa from that injury, is the same regardless of anatomic location in the 
gastrointestinal tract, supporting the hypothesis that GC4419 may be able to reduce the incidence 
and/or severity of radiation-induced esophagitis in subjects with cancer.  
4.3. 
Rationale for the Present Trial 
The goals of this Phase 2a trial are to obtain an initial estimate of the efficacy of GC4419 to 
reduce esophagitis in subjects receiving CRT for NSCLC and NSCLC. This Phase 2 trial will 
provide important data on the prevalence and degree of esophagitis during modern 
chemoradiotherapy for lung cancer, using the standard NCI and RTOG toxicity grading scales. 
Additional explorations will include descriptive assessment of radiation pneumonitis, 
patient-reported aspects of esophagitis using the National Cancer Institute- Common 
Terminology Criteria for Adverse Events-Patient Reported Outcome (NCI PRO-CTCAE), and 
incidence of narcotic use. 
This will be a single-arm, open-label study that will compare the frequency of ≥ Grade 2  
esophagitis in the study population to historical expectations. 

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5. 
TRIAL OBJECTIVES AND PURPOSE 
5.1. 
Primary Objective 
The primary objective of this study is to evaluate the incidence of acute radiation esophagitis 
(≥ Grade 2; NCI-CTCAE version 5) through the end of chemoradiotherapy for non-small cell 
lung cancer (NSCLC) and small cell lung cancer (SCLC) when GC4419 is added. 
5.1.1. 
Rationale for Primary Endpoint 
Radiation esophagitis is commonly reported according to the NCI grading scale. For this initial 
study, this scale is appropriate to make an initial estimate of whether a clinically meaningful 
reduction in radiation esophagitis may be possible when GC4419 is administered concurrent with 
standard chemoradiotherapy of subjects with lung cancer. Secondary and exploratory 
observations will further inform the efficacy results of the present trial.   
5.2. 
Secondary Objectives 
• To evaluate and compare the incidence of acute severe (Grade 3-4) radiation esophagitis 
by the NCI-CTCAE scale (Grade 3-4) through the completion of chemoradiotherapy; 
• To evaluate and compare the incidence of acute esophagitis ≥ Grade 2, 4 weeks after 
completion of chemoradiotherapy, using the NCI-CTCAE scale; 
• To evaluate and compare the presence of acute severe radiation esophagitis 4 weeks after 
completion of chemoradiotherapy; 
• To evaluate the incidence of acute (through 90 days after radiation therapy) radiation 
pneumonitis, ≥ Grade 2 by the NCI-CTCAE scale; 
• To evaluate the adverse events (AEs) associated with GC4419 by the NCI-CTCAE scale; 
• To assess weight loss (percent weight change from baseline through the completion of 
chemoradiotherapy, and 4 weeks after treatment). 
5.3. 
Exploratory Objectives 
• To explore the trend of severity of radiation esophagitis-related pain, dysphagia, and 
dyspepsia during combined chemotherapy and RT using these fields of the NCI 
PRO-CTCAE weekly during treatment, and 4 weeks after completion of 
chemoradiotherapy; 
• To evaluate the incidence of acute radiation esophagitis (≥ Grade 2; radiation therapy 
oncology group [RTOG] scale) through the end of chemoradiotherapy 
• To evaluate and compare the incidence of acute esophagitis ≥ Grade 2, 4 weeks after 
completion of chemoradiotherapy, using the RTOG scale 
• To assess patient-reported dysphagia via a daily patient log and collect use of parenteral 
or tube feeding due to esophagitis; 
• To assess opioid use by collecting the patient’s narcotic use in the previous 24-hour 
period at each weekly evaluation. 

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6. 
INVESTIGATIONAL PLAN 
6.1. 
Overall Study Design 
GTI-4419-203 will be an open-label, multi-center study to evaluate GC4419 administered IV for 
the reduction of radiation induced esophagitis in subjects receiving chemoradiotherapy for 
unresectable Stage 3 or post-operative Stage 2B NSCLC or SCLC. 
6.2. 
Treatment Plan and Duration of Therapy 
Aiming to include patients with expected significant risk of developing esophagitis, selected are 
those who will receive at least 60 Gy to the esophagus and are scheduled to receive RT 
combined with chemotherapy, delivered in once-daily fractions, 5 days/week, to a total dose of at 
least 60 Gy in fractions of 1.8-2.0 Gy, following the RTOG 1012 (Fogh 2017) trial design.  
Dose exposure to the esophagus, while using modern rotational techniques translates to a 
prescription based on the dose-volume exposure and histogram (DVH) relating an over 15% 
grade >2 esophagitis risk with V60>20% and/or V38> 30% (Verma 2017). 
In eligible subjects, at least an estimated 5 cm of the esophagus is exposed for at least 60 Gy 
(V60). Final RT planning should show that, at least one surface of the esophagus is included in 
the 60 Gy isodose volume. The volume exposure of the entire esophagus of 60 Gy (V60) should 
be at least in the 20% range and/or volume exposure of 38 Gy (V38) at least in the range of 30%. 
Subjects will receive concurrent chemotherapy other than gemcitabine, per investigator choice. 
Each subject will receive GC4419, 90 mg, by 60-minute IV infusion, prior to each fraction of 
RT. GC4419 should be administered so that RT is administered within 60 minutes of the end of 
the GC4419 infusion. 
GC4419 will be given beginning on the first day of radiation and continuing daily, concurrent 
with each dose of RT, to a cumulative radiation dose of at least 60 Gy. 
If RT is not administered on any given day due to a treatment break or unforeseen circumstances, 
GC4419 should not be administered on that day. Breaks in RT will be determined by the 
subject’s treating physician in accordance with standard of care, but in general should not exceed 
5 days without compensation by additional fractions. Subjects should resume GC4419 
administration when RT resumes. On days when planned doses of both GC4419 and RT are not 
administered (eg, due to a holiday site closure, etc.), GC4419 dosing may be extended along with 
RT to make up the missed dose(s). If a fraction of RT is not administered for any reason after 
GC4419 has been administered, that day’s GC4419 will count as one of the total doses. 
Antiemetic prophylaxis and hematopoietic growth factor use should be administered per ASCO 
guidelines. On days in which chemotherapy and GC4419 are administered, the administration 
sequence should be GC4419, RT, prehydration, and chemotherapy, when possible. Subjects 
treated with induction chemotherapy prior to concomitant chemoradiotherapy are not eligible for 
this study. 
PK sampling to assess GC4419 will be sought from all subjects. 

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6.2.1. 
Rationale for GC4419 Dose and Schedule Selection 
Data from the randomized Phase 2b study (GT-201) of GC4419 to reduce OM indicate that the 
acute toxicity of GC4419 at the 90 mg dose, and the overall AE profile, in combination with 
chemoradiotherapy will be acceptable. In addition, the efficacy results with the 90 mg dose of 
GC4419 in GT-201 support its use by a similar schedule and the same route and duration of IV 
administration in GTI-4419-203.  
6.3. 
Radiation Therapy 
6.3.1. 
Radiation Therapy Dose Specifications  
1. Subjects will be scheduled to receive treatment 5 days per week, in once daily 
fractions, 1.8-2.0 Gy per fraction in combination with chemotherapy. Total biological 
equivalent dose of 120 Gy is prescribed to (PET+) gross tumor areas combined with 
BED>100 Gy elective target coverage where indicated. 
2. All fields and the entire PTV must be treated daily. In case of machine problems or 
national holidays, a maximum 5-day gap and/or treatment over the weekend is 
permitted, additional compensating fractions are allowed per investigator discretion. 
3. The assigned drug needs to be given daily prior to the radiation treatment for all 
fractions. 
4. For simulation/planning GTV-PTV margins, we strongly advise 4D guidance and any 
form of motion management. In case 4D is not available, at least 7 mm margins are 
advised. Motion monitoring can reduce margins, however a minimum of 3mm CTV-
PTV is recommended. Normalization of the treatment plan will cover 95% of the 
PTV with the prescription dose. 
5. All radiation doses will be calculated with inhomogeneity corrections that consider 
the density differences within the irradiated volume (i.e., air in the lung and bone). 
Beam Energy: photons 6-18 MV are to be used. No electrons or protons are 
permitted. For Beam Shaping: Multi-leaf collimation (MLC) or individually-shaped 
custom blocks should be used to protect normal tissues outside of the target volume. 
6. Re-planning and adaptive workflows are permitted, although eligibility and analyses 
are based on the starting treatment plan. Changes or stops in both chemotherapy and 
radiotherapy need to be documented. 
7. The mean total dose (MTD) will be quoted as the PTV minimum target dose. This 
dose will be for a point that is at least 0.03 cc (approximately 3x3x3 mm) in size. The 
maximum and minimum point doses (within the PTV) will be reported for points that 
have a volume of 0.03 cc. The maximum dose must not exceed a value that is 120% 
of the prescribed dose. A 95% PTV coverage is aimed for. 
6.3.2. 
Localization, Simulation, and Immobilization  
A volumetric treatment planning CT study will be required to define gross tumor volume (GTV), 
clinical target volume (CTV), and planning target volume (PTV), see definitions below. Each 

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patient will be positioned in an immobilization device in the treatment position on a flat table, 
arms up if possible. Contiguous CT slices, having 3 mm thickness through the regions harboring 
gross tumor and grossly enlarged lymph nodes and 8-10 mm thickness of the remaining regions 
are to be obtained starting from the level of the vocal cords and extending inferiorly through the 
entire liver volume. The GTV, CTV, and PTV and normal organs will be outlined on all 
appropriate CT slices. For correct planning all CTs need to cover both entire lungs, delineation 
of the entire esophagus, both lungs, heart and a reconstructed Lung volume with PTV subtracted 
to estimate Dmean (lungs-PTV). With 4DCT based simulation, the iGTV can be constructed 
expressing all CT slices where GTV is present during the respiratory cycle. Extrapolation to ITV 
is recommended before translating to PTV. 
A treatment planning FDG PET/CT with 4D acquisition scan (or FDG-PET alone) with the 
patient in the treatment position is optional but strongly encouraged for treatment planning. In 
the case where the PET/CT is obtained in the treatment position, the CT from this study may be 
used as the planning CT scan.  
Intravenous (i.v.) contrast during the planning CT is optional provided a diagnostic chest CT was 
done with contrast to delineate the major blood vessels. If not, i.v. contrast should be given 
during the planning CT. If contrast is used, the densities can be overridden, or the contrast scan 
must be registered to a non-contrast scan for planning purposes. Optimal immobilization is 
critical for this protocol. Immobilization to assure reproducibility of the set-up is necessary.  
6.3.3. 
Target Volumes  
The definitions of target volumes will be in accordance with the 1993 ICRU Report #62.37.  
 Definition of the GTV: The primary tumor and clinically positive lymph nodes seen either on 
the planning CT (> 1 cm short axis diameter) or pretreatment PET scan (SUV > 3) will constitute 
the GTV. This volume(s) may be disjointed. In the event of a collapsed lobe or lung segment, the 
use of PET to distinguish tumor from fluid/atelectasis is encouraged.  
Definition of the CTV: The CTV is defined to be the GTV plus a 0.5 cm to 1 cm margin as 
appropriate to account for microscopic tumor extension.  
Internal target volume (ITV) consists of an internal margin added to the CTV to compensate for 
internal physiologic movement and variations in size, shape, and position of the CTV and 
includes here the envelope that encompasses the tumor motion for a complete respiratory cycle. 
Elective treatment of nodal areas is left up to the treating physician.  
Definition of the PTV: Free-breathing non-ITV approach (i.e. standard CT simulation without 
4DCT or fusion of inhalation and exhalation scans).  
There are two components to the PTV expansion: the internal motion (IM margin) which should 
be at least 1 cm in the inferior-superior direction, 0.5 cm in the axial plane and an additional set-
up margin (SU margin) of 0.5 cm. Thus, the total PTV includes the CTV plus a total margin of at 
least 1.5 cm to the superior-inferior dimensions and at least 1.0 cm in the axial plane.  

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For institutions not using 4DCT, the use of fluoroscopy to determine the margin for motion in 
the inferior superior direction is encouraged. For institutions with gating technology, the use of 
respiratory gating is encouraged. For breath-hold or gating approaches, the PTV margin should 
be at least 1 cm in the inferior-superior direction and 0.5 cm in the axial plane. It is expected that 
daily imaging will be used for both breath-hold and gating techniques.  
Definition of the PTV: Free-breathing ITV approach: 
If the ITV approach is used, then the PTV margin should account for setup uncertainties and may 
be individualized but should not be less than 1.0 cm. If daily imaging is used in combination 
with motion management tools, then the margins for setup margins (iGTV to PTV) may be 
reduced to 0.5 cm.  
In summary, there are 2 components to the PTV expansion: the internal motion (IM margin) 
which should be at least 1 cm in the inferior-superior direction, 0.5 cm in the axial plane and an 
additional set-up margin (SU margin) of 0.5 cm. Thus, the total PTV includes the CTV plus a 
total margin of at least 1.5 cm to the superior-inferior dimensions and at least 1.0 cm in the axial 
plane. In cases in which the PTV expansion extends outside of the skin, towards the spinal cord, 
or into the spinal canal, it can be assumed that tumor motion will not occur in this direction, and 
the PTV margin in this direction can be limited. PTV margin can be limited to 0.5 cm towards 
this dimension (skin or spinal canal).  
Normal anatomy to be identified: The normal anatomy to be outlined on each CT image will 
include the lungs (right and left done separately), heart, skin, esophagus and spinal cord. The 
heart should be contoured from its base to apex, beginning at the CT slice where the ascending 
aorta originates. The esophagus should be contoured from the bottom of the cricoid to the 
gastroesophageal junction. The skin and spinal cord should be contoured on each CT slice.  
6.3.4. 
Treatment Planning  
3D Conformal Therapy: The PTV is to be treated with any combination of coplanar or 
noncoplanar 3-dimensional conformal fields shaped to deliver the specified dose while 
restricting the dose to the normal tissues. Field arrangements will be determined by 3D planning 
to produce the optimal conformal plan in accordance with volume definitions. The treatment plan 
used for each patient will be based on an analysis of the volumetric dose including DVH 
analyses of the PTV and critical normal structures. Each field is to be treated daily.  In case of 
machine failure, the rest of fields can be treated the following day, any compensation in extra 
fractions is judged by the treating physician. 
Intensity Modulated Radiation Therapy (IMRT): IMRT, as well as rotational arc planning 
(RapidArc/VMAT) are allowed. The NCI Guidelines for the Use of IMRT can be found on the 
RTOG home page, http://www.rtog.org/. Acceptable approaches include the use of abdominal 
compression devices, breath hold techniques or other motion management technologies.  

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6.3.5. 
Critical Structures  
Normal tissue constraints shall be prioritized in the following order for treatment planning: 
1=spinal cord, 2=lungs, 3=esophagus, and 4=heart. 
1. Spinal Cord: The spinal cord dose limitation is the highest priority dose constraint and thus 
must be met irrespective of other constraints. Total “direct” plus “scatter” dose to the spinal cord 
must not exceed 50.5 in 2 Gy fractions (BED 100).  
2. Lungs: The dose-volume constraint to the lungs is the second highest priority and must be met, 
except if it conflicts with the cord dose constraints. The volume of both lungs that receive more 
than 20 in 2 Gy fractions (the V20) should not exceed 37% of the total. Alternatively, the mean 
lung dose should optimally be 20 Gy. (By total lung volume we mean the total lung minus the 
PTV.) If either of these constraints is exceeded, several solutions can be entertained. First, one 
might increase the weighting of AP / PA treatments by one and reduce the obliques. This can be 
done if the cord dose (above), which takes precedence, is not exceeded. Second, one can reduce 
the CTV to the minimum range suggested above. Third, one can try to reduce the PTV by using 
respiratory gating techniques. If after all attempts to decrease the V20 to below 37%, the V20 
value still exceeds this limit, the patient should be treated to the dose on the arm to which they 
were randomized.  
3. Esophagus: Esophagus must be contoured from the cricoid/vocal cords to GE 
junction/pylorus. The mean dose (Dmean) to the esophagus is optimally kept below 30 Gy 
(Martel 1999). This is not an absolute requirement, but is strongly recommended unless other, 
more critical constraints force the situation. The V60 and V38 (% volume of esophagus 
exceeding 38 and 60 Gy, respectively) should be calculated for each patient.  
** For this trial, V60 must be > 20% and/or V38 >30% to be enrolled, and remain on this trial 
OR at least 5 cm of one surface of the esophagus must be in the 60 Gy isodose volume (to ensure 
that there is a similar, significant risk for esophagitis among the subjects). 
OR 
***   A patient in whom the final planning shows that the esophagus is close but less than 5 cm 
is covered in the 60 Gy isodose volume may be allowed on the trial while V60>20% or 
V38>30% at the discretion of the principal investigator after discussion with the Medical 
Monitor.  
4. Heart: The following limits are recommended: 60 Gy to <1/3, 45 Gy to <2/3, and 40 Gy to 
<100% of the heart.  
6.3.6. 
Documentation Requirements  
1. Portal image of each field of 3-D radiation therapy or orthogonal images that localize the 
isocenter placement of IMRT must be obtained on the first day of therapy but should not be 
submitted.  

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2. Weekly verification or orthogonal images are required to be taken, but not submitted. This 
verification information also can be gathered with cone-beam CT or other CT devices that are 
present in the treatment room.  
3. Isodose plans and DVH in at least one axial, sagittal and frontal slice for each isocenter and 
DVHs of GTV, CTVs, and critical normal structures.  All replanning needs to be documented in 
the same way.  
4. Full QA report of planning (see section 10.2) needs a package of PDF or JPG documents 
including justification of contouring the whole esophagus (vocal cords to pylorus) pictured in 
1cm CT slices, indicating the 60 Gy and 38 Gy isodose in clear colors, while subtracting other 
isodose-lines. Including a color coded to indicate DVH including PTV and GTV coverage, Lung: 
Dmax, Dmean, V20; Esophagus: V20, V38, V60 and Dmean, as well as spine and heart: Dmax 
and Dmean is essential. At least one transverse, coronal and longitudinal image with the 38 Gy 
and 60 Gy isodose lines in relation with the esophagus contour need to be provided in PDF or 
JPG files. 
6.3.7. 
Compliance Criteria  
1. Variation Acceptable: Deviations of this magnitude are not desirable but are acceptable for 
treatment situations in which the target to critical structure geometry is challenging. The 
prescribed dose can cover as little as 90% of the PTV and still be a Variation Acceptable. The 
minimum dose within the PTV can fall to 93% of the prescribed dose. The max dose can exceed 
120% of the prescribed dose, but it cannot go above 125% of that dose. The 5 cm esophageal 
exposure up to 60 Gy is a pre-planning estimate for risk, final planning acceptation is judged 
upon V60, V38. 
2. Deviation Unacceptable: Dose distributions falling in this region are not acceptable, and plan 
modifications should be attempted to improve results. A Deviation Unacceptable occurs if any of 
the Variation Acceptable dose limits stated above are exceeded. Additionally, a Deviation 
Unacceptable is assigned if more than 1 cm of tissue outside the PTV receives ≥ 120% of the 
prescribed dose.  

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7. 
SELECTION AND WITHDRAWAL OF SUBJECTS 
Approximately 60 total subjects from investigational sites in US will be enrolled to achieve 
approximately 55 subjects who receive a full course of GC4419 with standard 
chemoradiotherapy, assuming a dropout rate of 10%. Subjects appropriate for this trial will be 
identified by the institutional Principal Investigator (or designee) who will make a preliminary 
determination of the patient’s eligibility for the trial in accordance with the provisions of the 
study protocol. Once a patient is enrolled to the study, the Sponsor or designee will assign a 
unique patient identification number that does not contain any Personal Health Information that 
will be used to reference the patient and corresponding data that is collected. 
7.1. 
Subject Inclusion Criteria 
Subjects are required to meet the following inclusion criteria before entering the trial: 
1. Subjects scheduled to be treated with (definitive or adjuvant) radiation therapy in 
combination with chemotherapy once daily for pathologically-confirmed Stage 3 or post-
operative Stage 2B NSCLC or limited stage SCLC  
2. Treatment plan for subjects show that 5 cm of the esophagus for at least one surface, is 
included in the 60 Gy isodose volume. Dose volume histograms show esophagus dose 
exposure meet V38>30% and/or V60>20% (to ensure that there is a similar, significant 
risk for esophagitis among the subjects). 
 
Note:   In case the final planning shows that the contoured esophagus is close to but the 60 Gy isodose does 
not cover completely 5 cm, this subject may be allowed on the trial at the discretion of the principal 
investigator after discussion with and review by the Medical Monitor.  
3. Age ≥ 18 years or older 
4. ECOG performance status ≤ 2  
5. Adequate hematologic function as indicated by: 
a 
Absolute neutrophil counts (ANC) ≥ 1,500/mm3 
b Hemoglobin (Hgb) ≥ 9.0 g/dL 
c 
Platelet count ≥ 100,000/mm3 
6. Adequate renal and liver function as indicated by: 
a 
Estimated baseline creatinine clearance >60 cc/min (CrCl = (140 – Age) x Mass (kg) 
x [0.85 if female] / 72 x [Serum Creatinine (mg/dL)]) 
b Total bilirubin ≤ 1.5 x upper normal limit (ULN) 
c 
Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ 2.5 x ULN 
d Alkaline phosphatase ≤ 2.5 x ULN  
7. Males and females must agree to use a highly effective contraception starting at least one 
day prior to the first day of treatment and continuing for 30 days after the last dose of 
GC4419 (females) or 90 days (males) 
8. Properly obtained written informed consent 

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7.2. 
Subject Exclusion Criteria 
Subjects will be excluded if they meet any of the following exclusion criteria: 
1. Metastatic disease  
2. Prior radiation therapy to the region of the study cancer or adjacent anatomical sites or 
more than 25% of total body marrow-bearing area (potentially interfering with 
chemo-tolerance) 
3. Subjects not receiving chemotherapy 
4. Grade 2 or greater esophagitis at baseline 
5. Inability to provide information in the electronic symptom-reporting device 
6. Subjects receiving approved or investigational immunotherapy, targeted therapy, 
hormone therapy, or biologic therapy 
7. Participation in another clinical trial or use of another investigational agent within 
30 days of first dose of GC4419. 
8. Malignant tumors other than the current lung cancer within the last 5 years, unless treated 
definitively and with low risk of recurrence in the judgment of the treating investigator  
9. Previous diagnosis of symptomatic pneumonitis (≥ Grade 2 CTCAE v 5.0 including 
immunotherapy induced pneumonitis) 
10. Untreated, active infectious disease requiring systemic anti-infective therapy   
11. Untreated HIV or history of hepatitis B/C (subjects who have been vaccinated for 
hepatitis B and do not have a history of infection are eligible) 
12.  Pregnant female subjects (including positive test for pregnancy); breastfeeding/lactating 
female subjects; female subjects of childbearing potential who are unwilling or unable to 
use a highly effective method of contraception as outlined in this protocol  
13. Known allergies or intolerance to chemotherapy and similar platinum-containing 
compounds 
14. Requirement for concurrent treatment with nitrates  
15. Requirement for treatment with drugs other than nitrates that may, in the judgment of the 
treating investigator, create a risk for a precipitous decrease in blood pressure.   
16. Clinically significant heart disease (eg, congestive heart failure of New York Heart 
Association Class 3 or 4, angina not well controlled by medication, or myocardial 
infarction within 6 months) 
7.3. 
Rationale for Patient Population 
As noted in the background sections, the lung cancer patient population to be included in this 
study is expected to have a significant rate of radiation esophagitis to afford an opportunity to 
observe a clinically meaningful reduction in esophagitis when GC4419 is added to the regimen.  

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7.4. 
Screen Failures 
A subject is considered  a screen failure if the subject signs the informed consent form (ICF) but 
withdraws consent or is deemed ineligible prior to Day 1 investigational product administration. 
The reason why the subject was precluded from the clinical study will be collected. All subjects 
who sign the ICF for this study, including screening failures, will be entered in the case report 
form (CRF). 
7.5. 
Subject Withdrawal Criteria 
In accordance with the Declaration of Helsinki, a subject has the right to withdraw from the 
study at any time for any reason. The Investigator may also, at his/her discretion, discontinue a 
subject from participating in this study at any time. Additionally, study treatment may be 
discontinued for any of the following reasons: 
• AE 
• Medical requirement to administer a contra-indicated medication 
• Subject non-compliance 
• Subject has a confirmed positive serum pregnancy test 
• Discontinuation of the study at the request of the Sponsor 
The primary reason for ceasing treatment will be clearly documented in the subject’s medical 
record and recorded on the appropriate CRF page. A subject who permanently discontinues 
treatment with GC4419 will not be allowed to be retreated. 
If a subject discontinues study drug because of an AE or serious adverse event (SAE), every 
attempt should be made to keep the subject in the study and continue to perform the required 
study-related follow-up and procedures. If this is not possible or acceptable to the subject, the 
subject may be withdrawn from the study. 
Subjects who withdraw consent for further administration of GC4419 should be encouraged to 
continue and complete their standard treatment with RT/chemotherapy and should be encouraged 
to continue with other study procedures, notably with esophagitis assessments as scheduled. 
If a subject withdraws consent, additional details about the reasons for that decision will be 
sought and documented. 
7.6. 
Study and Site Closure 
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. In terminating the study, 
the Sponsor and the Investigator will assure that adequate consideration is given to the protection 
of the subjects’ interests. 
Upon completion of the study, the monitor will conduct the following activities in conjunction 
with the Investigator or site staff, as appropriate: 

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• Return of all study data to the Sponsor (as applicable) 
• Resolution of all data queries 
• Accountability, reconciliation, and arrangements for all unused GC4419 
• Review of site study records for completeness 
• Shipment of laboratory samples (as applicable) 
In addition, the Sponsor reserves the right to temporarily suspend or prematurely discontinue this 
study either at a single site or at all sites at any time for reasons including, but not limited to, 
safety or ethical issues or severe non-compliance. If the Sponsor determines such action is 
needed, the Sponsor will discuss this with the Investigator (including the reasons for taking such 
action) at that time. When feasible, the Sponsor will provide advance notification to the 
Investigator of the impending action prior to it taking effect. 
The Sponsor will promptly inform all other investigators and/or institutions conducting the study 
if the study is suspended or terminated for safety reasons and will also inform the regulatory 
authorities of the suspension or termination of the study and the reason(s) for the action. If 
required by applicable regulations, the Investigator must inform the Institutional Review Board 
(IRB)/Independent Ethics Committee (IEC)/Research Ethics Board (REB) promptly and provide 
the reason for the suspension or termination. If the study is prematurely discontinued, all study 
data must be returned to the Sponsor. 
Financial compensation to investigators and/or institutions will be in accordance with the 
agreement established between the Investigator and the Sponsor. 

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8. 
INVESTIGATIONAL PRODUCT AND TREATMENT OF 
SUBJECTS 
8.1. 
Concomitant Medications 
All concomitant therapies (eg, prescription and over-the-counter medications) taken by subjects 
from Baseline of Day 1 GC4419 until 30 days following the last GC4419 dose, RT or 
chemotherapy dose (ie, whichever occurs last) will be collected in the CRF. Additionally, any 
concomitant therapies if used to treat any serious or related AE will be recorded in the CRF.   
Analgesic/narcotic medications will be captured and recorded along with other concomitant 
medications in the CRF. Narcotic use will be recorded from the baseline visit until 30 days 
following the last GC4419 dose, RT or chemotherapy dose (ie, whichever occurs last). 
Antiemetic prophylaxis and hematopoietic growth factors use should be administered per ASCO 
guidelines. 
Subjects who withdraw consent for further administration of GC4419 should be encouraged to 
continue and complete standard RT/chemotherapy treatment and other study procedures. 
However, if a subject withdraws consent for the study or is removed from the study completely 
(ie, the subject is no longer participating in any study procedures or follow-up) no further data 
should be collected after the date of the subject’s study discontinuation.  
8.1.1. 
Drug Interactions 
GC4419 is a strong inhibitor of CYP2D6.   
Concomitant use of GC4419 increases the concentration of drugs that are CYP2D6 substrates, 
which may increase the risk of toxicities of these drugs. Avoid concomitant use of GC4419 with 
CYP2D6 substrates where minimal increases in concentration of the CYP2D6 substrate may lead 
to serious or life-threatening toxicities (substrates with a narrow therapeutic range). Such 
CYP2D6 substrates (Appendix 7) include certain beta blockers (eg, propranolol and metoprolol), 
antidepressants (eg, tricyclics), antipsychotics (eg, phenothiazines and most atypicals), and 
antiarrhythmics (eg, propafenone, flecainide).  
In addition, concomitant use of GC4419 may decrease the concentration of active metabolites of 
prodrugs that require CYP2D6 for activation. Concomitant use of GC4419 with CYP2D6 
prodrug substrates requiring functional CYP2D6 activity for their clinical benefit (eg, codeine, 
tramadol, tamoxifen) may decrease their effectiveness.   
Concomitant administration of a CYP2D6-substrate drug concurrent with administration of 
GC4419 should be limited to cases in which the treating investigator has determined that the use 
of the specific CYP2D6-substrate drug is medically necessary. In such cases, the subject should 
be carefully observed for clinical adverse events of the CYP2D6-substrate drug, the dose of 
which may require reduction.   
See the Investigator's Brochure for additional information. 

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8.2. 
Prohibited Medications 
Investigators may prescribe any concomitant medication or supportive therapy deemed necessary 
to provide adequate supportive care. Supportive care includes anti-emetic prophylaxis, 
hematopoietic growth factor use is per ASCO guidelines, systemic antibiotics, hydration to 
prevent renal damage etc., consistent with local standard of practice, with the following 
exceptions:  
Prohibited medications/treatments: 
• Gemcitabine 
• Nitrates, phosphodiesterase type 5 (PDE 5) inhibitors (eg, sildenafil, tadalafil, or similar 
agents) or other drugs that in the judgment of the treating investigator could create a risk 
of a precipitous decrease in blood pressure are prohibited until at least 24 hours after the 
last dose of GC4419  
• Other biologic response modifiers – except systemic hematopoietic growth factors for the 
management of anemia or myelosuppression  
• Concurrent approved or investigational immunotherapy, targeted therapy, hormone or 
biologic therapy.  
• Concurrent investigational agents intended to reduce mucosal toxicity of radiation 
therapy 
• Other investigational agents 
All medication restrictions end after the 4-week post-RT follow-up visit is completed unless 
otherwise noted. 
Subjects who receive prohibited medications will not automatically be removed from the study; 
however, administration of a prohibited medication is a significant deviation from the protocol 
and must be reported to the Medical Monitor as soon as possible and the presiding IRB/IEC/REB 
(per institutional guidelines). The decision for study continuation or discontinuation will be made 
at that time on a case-by-case basis and in consideration of the clinical requirement and 
circumstances.  
Antiemetic prophylaxis and hematopoietic growth factor use are permitted per ASCO guidelines. 
Following ASCO (and multinational association of supportive care in cancer [MASCC]) 
guidelines for the prevention and management of chemotherapy-induced nausea and vomiting 
(CINV) is strongly encouraged. 
8.3. 
Description of Study Drug (GC4419) 
GC4419 is formulated as a sterile solution at a concentration of 9 mg/mL in 26 mM sodium 
bicarbonate-buffer and 0.9 wt. percentage sodium chloride in a stoppered glass vial.    

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8.3.1. 
GC4419 Drug Packaging and Labeling 
Open-label GC4419 will be provided as single-use vials for daily doses to be administered IV 
concurrent with RT.   
GC4419 is packaged as a 9 mg/mL solution in a 10 mL glass vial. Each vial will be labeled with 
the appropriate language, including information required by local heath authority regulations. 
Further label details will be provided in a separate Pharmacy Manual.   
8.3.2. 
Study Drug Storage 
GC4419 9 mg/mL drug product in 26 mM sodium bicarbonate buffered 0.9 wt % sodium 
chloride solution for parenteral administration should be stored refrigerated at 2°C-8°C in a 
secured and controlled area with restricted access. Temperature excursions above freezing and 
up to 25°C or down to 0.1°C for four hours are accepted; however, the Sponsor, or its designee 
must be notified immediately of the temperature excursion to ensure proper oversight.  
Once prepared, the IV bags containing GC4419/saline mixtures must also be stored at 2°C to 
8°C until use and must be administered to subjects within 24 hours of preparation. GC4419 
dosing solutions must not be frozen at any time. If freezing of the material is evident, that supply 
must be quarantined per institutional guidelines and Galera Therapeutics, Inc. or its designee 
must be notified immediately. 
8.3.3. 
Study Drug Preparation 
GC4419 will be provided to the study site in single use, sterile, pyrogen-free vials ready for dose 
preparation. Proper mixing with normal saline is required. Standard aseptic techniques will be 
used to maintain sterility.  
To prepare daily IV solutions, investigational pharmacists will extract 10 mL from a single vial 
and add to 250 mL normal saline. Note that there is no extraction of saline (ie, the infusion 
solution volume will be 250 mL normal saline + 10mL volume of GC4419 for a total volume of 
260 mL). No additional modifications or adjustments are to be made to the infusion solution.  
Infusions must be prepared using a sterile 0.2- or 0.22-micron syringe filter prior to introduction 
into the infusion bag or a sterile 0.2 or 0.22 micron inline filter must be used during IV 
administration. NOTE:  Filtration is mandatory, either during preparation with syringe filters or 
at IV administration with inline filters.  Unfiltered GC4419 solution or infusion solution must not 
be administered to patients.   
Further information and preparation details will be provided in a separate Pharmacy Manual. 
8.3.4. 
Administration 
GC4419 saline mixture will be administered intravenously at an infusion rate that totals 60 min 
(± 6 min to account for saline overfill) for the total dose assigned. Infusions of GC4419 must be 
administered using an infusion pump (ie, not by drip rate). Infusion pump models are not 
specified and may be per institutional preference/standard. 

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To facilitate administration of GC4419 according to the study schedule, an indwelling venous 
access device may be used, at the discretion of the treating Investigator. 
Radiation therapy should be administered as soon as possible after the end of the GC4419 
infusion. While detailed data to dictate a maximum permissible interval between the end of 
GC4419 infusion and administration of RT, the latter should be administered within 60 minutes 
of the end of the GC4419 infusion. 
GC4419 will be given beginning on the first day of radiation and continuing daily, concurrent 
with each dose of RT, up to the last prescribed fraction and the prescribed total cumulative 
radiation dose of at least 60 Gy. 
If RT is not administered on any given day due to a treatment break or unforeseen circumstances, 
GC4419 should not be administered on that day. Duration of treatment breaks need to be 
determined by the subject’s treating physician in accordance with standard of care. When 
GC4419 is administered, but RT could not be given that day, that dose is counted.  All following 
RT retake days will need to be accompanied by GC4419 dosing before each fraction; resulting in 
a total number of drug dosing one greater than the RT fractions given in total.  GC4419 dosing 
must be extended along with RT until the end (to a maximum of 35). 
8.3.5. 
Accountability and Compliance 
Compliance with GC4419 dosing, including administration details (eg, volume, start, stop times, 
etc) should be documented in the source documents and recorded on the CRF. 
The Investigator is responsible for ensuring adequate accountability of all used and unused 
GC4419. This includes acknowledgment of receipt of each shipment of GC4419 (quantity and 
condition), subject dispensing records, and quantity of GC4419 returned or destroyed. 
Dispensing records will document quantities received from the Sponsor and quantities dispensed 
to subjects, including container number or lot number, date dispensed, subject identifier number, 
subject initials, and the initials of the person dispensing the medication. Any GC4419 that is 
prepared but not used must also be recorded in the dispensing records. 
All GC4419 supplies and associated documentation will be reviewed and verified by the study 
monitor. All GC4419 and used containers are to be retained by the site until notified by the study 
monitor, who will instruct the site in the disposal and/or destruction of all used GC4419 supplies. 
Copies of all forms, documenting drug receipt at the study site, drug transportation to satellite 
sites, and drug return to the Sponsor, together with drug accountability records, will be retained 
according to the regulations governing record retention. 
The Investigator will not allow GC4419 to be given to any patient not included in the study or to 
any unauthorized person. 
8.3.6. 
Study Drug Handling and Disposal 
After completion of the study, all unused study drug will be inventoried and if possible, 
destroyed locally at the site. GC4419 should not be returned directly to Galera Therapeutics, Inc. 
unless specifically requested by Galera Therapeutics, Inc.. The study monitor will instruct the 

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site in the disposal and/or destruction of all used and unused GC4419 supplies. Destruction of 
any GC4419 should be documented appropriately. 

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9. 
TOXICITY MANAGEMENT 
9.1. 
Anticipated toxicities of GC4419 
Based on the drug’s mechanism of action, adverse effects anticipated with GC4419 are 
attributable to transient potentiation of nitric oxide.  Clinical results with GC4419 to date are 
consistent with this.  These effects have been IV infusion related and transient, typically with 
onset during or at the end of infusion, resolving within 1-2 hours of cessation of GC4419 
administration. At the dose and schedule planned in this trial, these effects may include mild 
hypotension, postural lightheadedness/presyncope, and perioral/facial tingling or 
paresthesia.  Mild nausea and vomiting have also been observed in human subjects receiving 
GC4419.   
Safety results from the randomized Phase 2b trial of GC4419 in combination with IMRT and 
concurrent cisplatin to reduce severe oral mucositis experienced by patients with head and neck 
cancer do not suggest that GC4419 increases the frequency or severity of the known adverse 
effects of IMRT/platinum.  This finding includes an absence of increase in severe nausea or 
vomiting when GC4419 was added to the standard chemoradiotherapy.  Accordingly, routine 
antiemetic prophylaxis is not considered required for GC4419, and antiemetic prophylaxis 
should follow guidelines for concurrently administered chemotherapy.   
Per the investigator’s brochure, individual adverse events commonly occurring with 
chemoradiotherapy administered concurrently with GC4419 are considered “expected” for 
purposes of ongoing safety analysis.  See the investigator’s brochure for additional details. 
Interference with the anti-tumor efficacy of chemoradiotherapy by GC4419 is a potential risk, 
although nonclinical studies and clinical observations to date suggest that such interference is 
unlikely, and nonclinical studies have demonstrated mechanism-related anti-tumor synergy of 
GC4419 with radiotherapy. However, patients must be informed of the potential risk before 
receiving GC4419.  
9.2. 
Dose Delays and Dose Modifications for Toxicity 
The following toxicities require a 25% dose reduction in GC4419: 
• Grade 2 or greater hypotension occurring within one hour of the end of GC4419 infusion 
• Grade 3 or greater nausea or vomiting  
• The dose of GC4419 may be reduced by 25% for Grade 3-4 AEs judged by the 
Investigator to be likely attributable to the study infusion. 
Subject to the judgment of the treating investigator, GC4419 dosing should be interrupted or 
reduced according to the provisions of this section as necessary for toxicities potentially 
attributable to either GC4419 or chemoradiotherapy.  
Two dose reductions for toxicity will be permitted per patient. After the first event, the patient 
will be re-challenged at 75% of the original dose (7.5 mL GC4419 in 250 mL normal saline).  

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After the second event, the patient will be re-challenged at 50% of the original dose (5.0 mL 
GC4419 in 250 mL normal saline). Subjects who are unable to tolerate GC4419 infusions 
following two dose reductions must be discontinued from the study treatment but may continue 
with chemotherapy/RT at the discretion of the treating investigator. 
Dose re-escalation of GC4419 may be considered ONLY after consultation with the Sponsor’s 
Medical Monitor. 
Toxicities (including those attributable to chemotherapy and RT) should also be, managed per 
institutional and ASCO guidelines and investigator judgment. 
9.3. 
Supportive Care Guidelines 
Necessary supportive measures for optimal medical care will be given throughout the study. 
Supportive care medications may be administered at the investigator's discretion and recorded in 
the CRF (including administration of prophylactic antiemetic medication if deemed appropriate 
by the investigator). However, medications are subjected to the exclusions listed in Section 8.2. 
9.3.1. 
Supportive Care for Chemotherapy-induced Nausea and Vomiting 
Medication to prevent or manage CINV should follow recent guidelines from ASCO and 
MASCC.  
Supportive care for CINV should be optimized, per ASCO and MASCC guidelines, before 
GC4419 dose is reduced for nausea and vomiting.   

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10. 
ASSESSMENTS 
The study procedures to be conducted for each patient enrolled in the study are described in the 
text that follows and presented in Appendix 1. 
Any deviation from protocol procedures should be documented and explained in the source 
documents. The sponsor (or designee) and the site’s IRB (as required by the IRB’s policies and 
procedures) should be notified as soon as possible of any substantial deviations potentially 
affecting patient safety, study drug administration or the assessment of safety, efficacy, and 
tolerability parameters. 
10.1. 
Safety Assessments 
Safety assessments will consist of monitoring and recording all AEs, including all CTCAE 
grades (for both increasing and decreasing severity). Safety will be assessed based on treatment-
emergent AEs, physical examination findings, clinical laboratory tests, electrocardiogram (ECG) 
measurements, and vital sign measurements. 
10.1.1. 
Clinical Assessments 
The following clinical assessments are defined when referenced in the schedule of events 
(Appendix 1) for this study: 
• 12-Lead ECG: ventricular rate, P-R interval, QRS interval, QT interval, and QTc 
• Vital signs: measured following two minutes of rest in the sitting position – temperature, 
systolic and diastolic blood pressures, heart rate, and respiration rate  
• Weight and Height: measured in kilograms (kg) and centimeters (cm), respectively 
• Performance Status: ECOG (see Appendix 3 for conversion criteria for Karnofsky to 
ECOG). 
10.1.2. 
Laboratory Assessments 
Clinical laboratory tests during the study will be performed by a central lab. All 
protocol-required blood samples will be collected and sent to the central laboratory as specified 
in the laboratory manual.   
Local laboratories may be used for treatment decisions, safety evaluation, and for management 
of chemotherapy-related toxicity, as appropriate; however, local laboratory results will not be 
collected. All local hematology and blood chemistry samples are to be obtained prior to study 
drug administration and results reviewed prior to administration/dispensing of study drug at the 
beginning of each treatment cycle.  
A laboratory abnormality reported by either the central laboratory or local laboratory may meet 
the criteria to qualify as an AE or SAE as described in this protocol. In these instances, the AE 
corresponding to the laboratory abnormality will be recorded on the Adverse Event electronic 
CRF.  

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For laboratory abnormalities meeting the criteria of SAEs, the site must fax or email the SAE 
report including the laboratory report (as regionally required) to the sponsor using the SAE form. 
The investigator must assess all abnormal clinical laboratory results for clinical significance in a 
timely fashion. A notation of clinically significant (CS) or non-clinically significant with initials 
and date will be documented on the respective laboratory report next to any abnormal value. 
Information on laboratory AE reporting can be found in Section 11.  
The following laboratory assessments are defined when referenced in the schedule of events 
(Appendix 1) for this study: 
• Hematology Profile: Hemoglobin, hematocrit, red blood cell count, white blood cell 
count with differential, and platelet count. Differential to include total neutrophils, 
lymphocytes, monocytes, eosinophils, and basophils. 
• Serum Chemistry Profile: glucose, BUN, creatinine, sodium, potassium, calcium, 
albumin, total protein, direct bilirubin, total bilirubin, alkaline phosphatase, ALT (SGPT), 
AST (SGOT), chloride, phosphate, bicarbonate. 
• Serum Pregnancy Test: required for all females of childbearing potential. Lack of 
childbearing potential must be noted in the source documents, if applicable. 
10.1.3. 
Pneumonitis Assessment 
The following will be completed for the pneumonitis assessment: 
• NCI-CTCAE scale (version 5.0) 
• CT of chest with IV contrast, unless contrast is medically contraindicated. 
• FDG positron emission tomography/CT, and mediastinal staging if appropriate 
(investigator’s discretion); and 
• Spirometry including forced expiratory volume measurement and diffusing capacity of 
the lungs for carbon monoxide (DLCO). 
10.1.4. 
Tumor Assessment 
Tumor recurrence is common after SCLC and NSCLC treatment.  Therefore, surveillance with 
history and physical (H &P) and chest CT (with or without contrast) is recommended in the 
NCCN guidelines Version 7.2019. Data from 3 randomized phase 3 trials are not available to 
clarify surveillance recommendations; therefore, the most appropriate schedules are 
controversial.  An analysis suggests that patients who survive lung cancer have a high symptom 
burden and are most likely to endure an event 1 year after diagnosis and treatment.  In this study, 
patients will undergo H&P and chest CT with or without contrast, consistent with institutional 
guidelines, at screening and every 3 months for one year after treatment, to assess progression-
free and overall survival. This is considered consistent with standard of care.   
 
 

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10.2. 
Radiation Therapy Quality Assurance 
Quality assurance for RT (RTQA) will be conducted by a prospective review of the overall 
treatment plan, at the time of subject screening, by a radiation oncologist who is not an 
Investigator on the study. For validation, RT treatment details, dosimetry, and dose volume 
histograms will be collected after simulation. Table position, slice thickness should be displayed 
on treatment plan images. For each subject, each sites' dosimetrist will calculate and document 
numeric information on the RTQA worksheet which will be sent for review. Recommendations, 
including key points for Radiation Oncologist when completing RT planning can be found in 
Section 6.3.  
It is important that CT simulation imaging is done from vocal cords (superiorly) to mid liver 
(inferiorly) for scan completeness covering whole esophagus and both entire lungs. 4D and/or 
PET fusion and acquisition is recommended for ITV, iGTV definition. For contouring, the lower  
border of the cricoid defines as superior extent of cervical esophagus and the GE 
junction/pylorus as the lower extent of esophagus.  
The following data is required: 
• For the esophagus: V60, V20, V38,  Dmean, Dmax 
• For the lung: Mean lung dose, V20 and V30 
Available information should be collected regarding PTV coverage, prescribed doses for elective 
and gross tumor volumes, fractionation and type of chemotherapy. 
This review is to confirm that the RT plan meets the eligibility requirements for the study. 
10.3. 
Pharmacokinetic (PK) Measurements 
10.3.1. 
Pharmacokinetic (PK) Measurements of GC4419 
PK sampling will be sought from all subjects for GC4419. 
Plasma samples for GC4419 PK measurements will be collected in two cycles: Study Days 1 and 
2, and on Study Day 22. On Study Days 1 and 22, four samples will be drawn as follows: 
The first sample will be drawn prior to GC4419 administration. 
The second sample will be drawn within 10 minutes after the end of GC4419 infusion. 
The third sample will be drawn within 10 minutes after the end of RT. 
The fourth and final sample will be drawn between 60 and 180 minutes after the end of GC4419 
infusion. 
On Study Day 2 only one PK sample will be drawn. This sample should be drawn prior to the 
GC4419 infusion on Day 2. 
Table 3 below summarizes the PK sample collection time points. Note that this schedule may be 
adjusted to accommodate mid/late-week study starts and holidays. Adjustments in the PK 
schedule must be discussed with the Sponsor or its representative ahead of time. Time of actual 

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blood draws for PK assessment must be recorded in the source notes. Plasma PK samples will be 
sent to a central laboratory for analysis and interpretation. Further details on PK sample 
collection, processing, and shipping are provided in a separate manual. Volumes and start/stop 
times for administration of IV fluids will be collected on PK sampling days. 
Table 3 
Pharmacokinetic Sampling Schedule to Assess GC4419 
Timepoint 
Day 1 
Day 2 
Day 22 
Pre-GC4419 
X 
X 
X 
End of GC4419 Infusion (+10min) 
X 
 
X 
Post-RT (+10min)  
X 
 
X 
60-180 min Post End of GC4419 Infusion 
X 
 
X 
10.4. 
Patient Reported Outcomes (PRO) and Diaries 
10.4.1. 
Patient Reported Outcomes (PROs) 
Subjects will be required to personally complete the following PROs once prior to treatment 
(may be done at the baseline visit prior to dosing), weekly during treatment and at the 4-week 
post-RT follow-up visit.  
• NCI PRO-CTCAE pain, dysphagia, and dyspepsia; and 
• Numeric Pain Rating Scale (NPRS). 
10.4.2. 
PRO-swallowing Diary 
Subjects will be required to personally complete a daily swallowing diary. The diary will be 
completed once prior to treatment (may be done at the baseline visit prior to dosing), daily 
during treatment and daily until the 4-week post-RT follow-up visit. 
10.4.3. 
Pain Medication  
Information regarding analgesic / narcotic use will be obtained weekly during the radiation 
treatment period through 4 weeks post completion of chemoradiotherapy (Baseline Visit through 
4-week post-RT). In addition, general concomitant medications will be recorded by study 
personnel on weekdays during RT treatment.  
10.5. 
Schedule of Time and Events 
A schedule of study assessments table is in Appendix 1. Minor changes to the assessment 
schedule may be made to accommodate holidays, administrative closures, etc., which if 
necessary, are not considered as significant deviations by the Sponsor. Sites should contact the 
Sponsor (or its representative) prospectively to address rescheduling protocol assessments and 
data handling. 

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10.6. 
Screening Phase 
The following screening observations and procedures will be completed within 28 days prior to 
the start of RT and GC4419 unless otherwise noted below:  
• Obtain a signed IRB/IEC/REB-approved informed consent  
• Confirm patient eligibility by reviewing inclusion/exclusion criteria 
• Obtain medical history, smoking and alcohol use 
• Obtain NSCLC or SCLC cancer history; history should include: 
o Prior treatments  
o Confirmation of histopathological diagnosis  
• Conduct a complete physical examination, including height (record body surface area).  
Height will only be collected at screening. 
• Conduct Esophagitis assessment and record the CTCAE and the RTOG score (Appendix 
2) 
• Conduct Pneumonitis Assessment: NCI-CTCAE scale, CT scan, spirometry, and DLCO 
– Spirometry and DLCO tests can be used if completed within 56 days prior to start of 
treatment as standard of care. 
• Conduct Tumor Assessment: Chest CT (with or without contrast)  
• Patient to complete the NCI PRO-CTCAE and NPRS within 1 week prior to treatment.  
This may be completed at the baseline visit prior to dosing. 
• Patient to complete swallowing diary once within 1 week prior to treatment. This may be 
completed at the baseline visit prior to dosing. 
• Record planned RT and chemotherapy parameters  
• Measure vital signs, body weight and ECOG Performance Status 
• Conduct a 12-lead ECG – performed at screening or within 56 days prior to start of 
treatment as standard of care. 
• Record/update medical conditions and illnesses that have occurred since the patient 
signed the ICF 
• Draw blood for laboratory measurements: 
o Chemistry profile 
o Hematology profile 
o Serum pregnancy test for women of childbearing potential 
All questions related to patient eligibility should be directed to the Sponsor’s Medical Monitor or 
designee. 

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10.7. 
Active Phase 
10.7.1. 
Baseline/Day 1 (First Day of RT and GC4419) 
Prior to receiving the first dose of GC4419, the following observations and procedures will be 
conducted for all subjects: 
• Confirm continued patient eligibility by reviewing inclusion/exclusion criteria  
• Measure vital signs, body weight, and ECOG Performance Status 
• Provide and review instructions for completion of the daily swallowing diary if not done 
prior to this visit 
• Provide the daily swallowing diary if not done prior to this visit 
• Have the patient complete the PROs and NPRS and review completion if not done prior 
to this visit 
• Conduct Esophagitis assessment and record the severity using the CTCAE and RTOG 
score 
• Ensure concomitant medications, including analgesic / narcotic use, have been recorded 
from date of baseline  
• Record/document AEs starting from date of baseline 
• Record/update medical history with conditions and illnesses that have occurred since the 
patient signed the ICF  
• Draw blood for laboratory measurements: 
o Chemistry profile 
o Hematology profile 
o PK sampling (See Section 10.3) 
Administer the first GC4419 dose by continuous IV infusion over 60 minutes. GC4419 should be 
administered so that RT is administered within 60 minutes of the end of the GC4419 infusion. 
The following administration sequence should be used when possible: GC4419, RT, 
prehydration then chemotherapy. 
10.7.2. 
Week 1 of RT and GC4419 
Prior to GC4419 administration, the following observations and procedures will be conducted for 
all subjects on all RT Days: 
• Record concomitant medications 
• Record AEs 
• Conduct esophagitis assessment daily and record the severity using both the CTCAE and 
RTOG grading scales. 
• Ensure the daily swallowing diary is completed  

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• Administer GC4419 dose by continuous IV infusion. GC4419 should be administered so 
that RT is administered within 60 minutes of the end of the GC4419 infusion. 
Prior to GC4419 administration, the following observations and procedures will be conducted for 
all subjects on Day 3, or 4, or 5 unless otherwise noted: 
• Draw blood for laboratory measurements:  
o Chemistry profile 
o Hematology profile  
o PK sampling (See Section 10.3) – Day 2 only 
10.7.3. 
Weeks 2, 3, 5, and 6 (and additional RT weeks if needed) 
Prior to RT administration, the following observations and procedures will be conducted for all 
subjects on all RT days: 
• Record concomitant medications and need for parenteral or tube feeding 
• Record AEs 
• Conduct esophagitis assessment daily and record the severity using both the CTCAE and 
RTOG grading scales. 
• Ensure the daily swallowing diary is completed. 
Prior to GC4419 administration, the following observations and procedures will be conducted for 
all subjects once each week: 
• Record analgesic / narcotic use 
• Have the patient complete the PROs and NPRS and review completion.  
• Draw blood for laboratory measurements: 
o Chemistry profile 
o Hematology profile 
Administer GC4419 doses by continuous IV infusion. GC4419 should be administered so that 
RT is administered within 60 minutes of the end of the GC4419 infusion. 
10.7.4. 
Week 4 
Prior to RT administration, the following observations and procedures will be conducted for all 
subjects on all RT days: 
• Record concomitant medications and need for parenteral or tube feeding 
• Record AEs 
• Conduct esophagitis assessment daily and record the severity using both the CTCAE and 
RTOG grading scales. 
• Ensure the daily swallowing diary is completed. 

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Prior to GC4419 administration, the following observations and procedures will be conducted for 
all subjects once this week: 
• Record analgesic / narcotic use 
• Perform symptom-directed PE 
• Have the patient complete the PROs and NPRS and review completion.  
• Measure vital signs, body weight and ECOG Performance Status 
• Draw blood for laboratory measurements: 
o Chemistry profile 
o Hematology profile 
o PK sampling (See Section 10.3) – Day 22 only 
Administer GC4419 doses by continuous IV infusion. GC4419 should be administered so that 
RT is administered within 60 minutes of the end of the GC4419 infusion. 
10.7.5. 
Last Day of RT or Early Termination Visit 
Prior to RT administration, the following observations and procedures will be conducted for all 
subjects on the last day of RT or if the patient terminates study participation early: 
• Conduct a complete physical examination  
• Measure vital signs, body weight, and ECOG status 
• Pneumonitis Assessment: NCI-CTCAE scale, CT scan, spirometry, and DLCO 
• Ensure the daily swallowing diary is completed 
• Conduct Esophagitis assessment for the week and record the severity using both the 
CTCAE and RTOG scales 
• Have the patient complete the PROs and NPRS and review completion  
• Record any concomitant medications including analgesic/narcotic use and need for 
parenteral or tube feeding 
• Record AEs 
• Draw blood for laboratory measurements: 
o Chemistry profile 
o Hematology profile  
10.7.6. 
4 Weeks Post-RT  
All subjects will be evaluated at 28 ± 15 calendar days from the last day of RT. The following 
should be completed at this visit: 
• Conduct a complete physical examination  
• Measure vital signs, body weight, and ECOG status 

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• Record any concomitant medications including analgesic/narcotic use and need for 
parenteral or tube feeding 
• Record AEs through 30 days after the last dose of RT 
• Conduct Esophagitis assessment for the week and record the severity using both the 
CTCAE and RTOG scales 
• Have the patient complete the PROs and NPRS review completion.  
• Collect swallowing diary and ensure it was completed daily through 4 Weeks post-RT 
• Draw blood for laboratory measurements: 
o Chemistry profile 
o Hematology profile 
10.8 
Post Active Phase 
10.8.1 
 
90 Days Post-RT 
All subjects will be evaluated at 90 ± 15 calendar days from the last day of RT. The following 
should be completed at this visit.  
• Conduct a complete physical examination  
• Pneumonitis Assessment: CT scan, spirometry, and DLCO. Evaluate for acute RT 
pneumonitis, ≥ Grade 2 by the NCI-CTCAE scale 
• Record any updates to SAEs which were ongoing at the 4 weeks post-RT visit 
• Tumor Assessment: Chest CT (with or without contrast) to be performed based on 
standard of care CT follow up 
10.8.2 
 
6 months, 9 months and 1-year post-RT (±30 days) 
Subjects will undergo a physical exam and Chest CT (with or without contrast) based on 
standard of care CT follow-up 

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11. 
ADVERSE EVENTS AND SERIOUS ADVERSE EVENTS 
The investigator is responsible for the detection and documentation of events meeting the criteria 
and definition of an AE or SAE as provided in this protocol. Throughout the study, AEs will be 
recorded in the source documents and on the appropriate pages of the CRF regardless of whether 
the AEs are considered related to GC4419. To avoid confusion, the AE should be recorded in 
standard medical terminology. 
11.1. 
Definitions 
The following definitions of terms are guided by the International Conference on Harmonization 
and the US Code of Federal Regulations and are included here verbatim.   
11.1.1. 
Adverse Event (AE) 
An AE is any untoward medical occurrence in a patient or clinical investigation subject 
administered a pharmaceutical product and which does not necessarily have a causal relationship 
with this treatment. An AE can therefore be any unfavorable and unintended sign (including an 
abnormal laboratory finding), symptom, or disease temporally associated with the use of a 
medicinal (investigational) product, whether related to the medicinal (investigational) product. 
Examples of an AE include: 
• Significant or unexpected worsening or exacerbation of the condition/indication under 
study.   
• Exacerbation of a chronic or intermittent pre-existing condition including either an 
increase in frequency and/or intensity (grade) of the condition. 
• New conditions detected or diagnosed after investigational product administration even 
though they may have been present prior to the start of the study. 
• Signs, symptoms, or the clinical sequelae associated with a suspected interaction of the 
investigational product with a concomitant medication. 
• Signs, symptoms, or the clinical sequelae associated with a suspected overdose of either 
investigational product or a concurrent medication. 
11.1.2. 
Serious Adverse Event (SAE) 
Any untoward medical occurrence that at any dose: 
• Results in death, 
• Is life-threatening – NOTE: The term ‘life-threatening’ in the definition of ‘serious’ refers 
to any adverse drug experience [adverse event] that places the patient or subject, in the 
view of the investigator, at immediate risk of death from the reaction as it occurred, ie, it 
does not include a reaction that, had it occurred in a more severe form, might have 
caused death.  [emphasis added] 
• Requires inpatient hospitalization or prolongation of hospitalization – NOTE: In general, 
hospitalization signifies that the patient or subject has been detained (usually involving at 
least an overnight stay) at the hospital or emergency ward for observation and/or 

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treatment that would not have been appropriate in the physician’s office or outpatient 
setting. Complications that occur during hospitalization are AEs. If a complication 
prolongs hospitalization or fulfills any other serious criteria, the event is serious. When 
in doubt as to whether “hospitalization” occurred or was necessary, the AE should be 
considered serious. Hospitalization for elective treatment of a pre-existing condition that 
did not worsen from baseline is not considered an AE. 
• Results in persistent or significant disability/incapacity – NOTE: The term disability 
means a substantial disruption of a person’s ability to conduct normal life functions. 
OR 
• Is a congenital abnormality/birth defect. 
• Is a other important medical event 
11.2. 
Adverse Event Reporting Requirements 
11.2.1. 
Serious Adverse Events 
All events meeting the criteria for SAEs (see Section 11.1.2) must be reported by investigational 
sites within 24-hours of becoming aware of the event. In order to determine the sponsor’s 
timeline for notifying regulatory authorities and investigators per Federal Regulations, an event 
term, serious criteria, and causality is required at the time of the initial report. Specific SAE 
reporting instructions are provided in a separate manual. 
The investigator is responsible for notifying the IRB/IEC/REB in writing of serious events as 
soon as is practical in accordance with the policy of the IRB/IEC/REB. 
11.2.2. 
All Adverse Events (AEs) Regardless of Seriousness 
Any adverse medical condition or laboratory abnormality with an onset date before the date of 
the baseline visit is pre-existing in nature, and part of a subject’s medical history. Adverse 
medical conditions that begin on or after date of baseline visit will be considered an AE, 
including SAEs, and followed for 30 days after the last dose of RT, chemotherapy, or GC4419 
(ie, whichever occurs last), hereafter referred to as the “30 Day Follow-up Period”. Similarly, 
new events will be reported as AEs/SAEs if the start date is within 30 Day Follow-up Period. 
Increases in toxicity grade of pre-existing conditions that occur on or after the date of the 
baseline visit are also considered an AE. 
All AEs must be recorded in the patient’s source documents and on the CRF regardless of 
frequency, severity (grade) or assessed relationship to study drug.  
11.2.3. 
Clinical Laboratory Abnormalities and Other Abnormal Assessments as AEs 
and SAEs 
Clinically significant abnormal laboratory findings or other abnormal assessments that are 
associated with the disease being studied, unless judged by the investigator as more severe than 
expected for the patient’s condition, or that are present or detected at the time of the baseline 
visit and do not worsen, will not be reported as AEs or SAEs.   

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A laboratory abnormality reported by either the central laboratory or local laboratory may meet 
the criteria to qualify as an AE or SAE as described in this protocol. Laboratory abnormalities 
should only be recorded in the AE section of the CRF if at least one of the following criteria is 
met: 
• Meets the criteria of an SAE 
• Resulted in a dose reduction and/or delay in the administration of GC4419, RT, and/or 
chemotherapy 
• Treatment is initiated for the abnormality 
• Investigational product was discontinued 
• Grade 3 or Grade 4 per (NCI-CTCAE version 5.0)  
For laboratory abnormalities meeting the criteria of SAEs, the site must complete and send the 
SAE report including the laboratory report (as regionally required) to the sponsor using the SAE 
form. Abnormal assessments (eg, ECGs) that are judged by the investigator as clinically 
significant will be recorded as AEs or SAEs if they meet the definitions as defined in 
Section 11.1.   
11.2.4. 
Disease-related Events and/or Disease-related Outcomes Not Qualifying as SAEs 
Esophagitis will not be reported as AEs as it is captured as a study endpoint in the CRF. 
Progressive disease found by scan or on clinical evaluation should be captured on the applicable 
CRF pages and not as an AE. 
11.2.5. 
Grading of Adverse Events 
The severity of AEs will be designated as mild, moderate, severe, life threatening, or fatal per 
NCI-CTCAE version 5.0. If not specifically addressed in NCI-CTCAE version 5.0, use Table 4 
below: 

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Table 4. 
Adverse Event Severity 
Grade 
Criteria1 
Mild – Grade 1 
Asymptomatic or mild symptoms; clinical or diagnostic observations only; 
intervention not indicated 
Moderate – Grade 2 
Minimal, local, or non-invasive intervention indicated; limiting age-appropriate 
instrumental ADL2 
Severe – Grade 3 
Severe or medically significant but not immediately life-threatening; 
hospitalization or prolongation of hospitalization indicated; disabling; limiting 
self-care ADL3 
Life Threatening – Grade 4 
Life-threatening consequences; urgent intervention indicated 
Death – Grade 5 
Death related to adverse event 
ADL = Activities of Daily Living. 
1 
A semi-colon indicates ‘or’ within the description of the grade. 
2 
Instrumental ADL refer to preparing meals, shopping for groceries or clothes, using the telephone, managing 
money, etc. 
3 
Self-care ADL refer to bathing, dressing and undressing, feeding self, using the toilet, taking medications, and 
not bedridden. 
 
11.3. 
Relationship to Study Drug 
All AEs will be categorized by the investigator with respect to their relationship to GC4419. The 
relationship between GC4419 and the AE may be considered related, possibly related, or 
unrelated. The criteria for each category are listed below: 
• Related: It is likely that GC4419 caused or contributed to the cause of the AE or 
laboratory abnormality, when the temporal sequence from the time of GC4419 
administration, the known consequences of the patient’s clinical/state condition or study 
procedures, the effects of discontinuing or re-introducing GC4419 on the AE, and other 
medically relevant factors are considered.   
• Possibly Related: There is a reasonable possibility that the AE or laboratory abnormality 
was caused by GC4419, when the temporal sequence from the time of GC4419 
administration, the known consequences of the patient’s clinical state/condition or study 
procedures, and other medically relevant factors are considered.   
• Unrelated: The investigator has a high level of certainty that the patient’s clinical 
state/condition, study procedures, or other medically relevant factors other than treatment 
with GC4419 caused the AE or laboratory abnormality. This relationship category should 
only be used when a clear precipitating cause exists, and it is not reasonably possible that 
the event is caused by treatment with GC4419. 
If the relationship between the AE/SAE and the investigational product is determined to be 
“possibly related” the event will be considered as related to the investigational product for the 
purposes of expedited regulatory reporting. 

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11.4. 
Recording Adverse Events 
All AEs must be recorded on the appropriate CRF regardless of the severity or relationship to 
GC4419. All AEs that meet the seriousness criteria should also be recorded on the SAE Report 
Form. All SAEs must be reported to the Sponsor or delegated organization within the timeline 
stated in Section 11.2. 
The recording of AEs will be based on data obtained from the following sources: 
• Medical and surgical history 
• Physical examinations including vital signs 
• Clinical laboratory test results 
• Subject verbal reports to the investigational staff and documented in the medical chart 
All clinical events, including both observed (such as any reaction at sites of application) and 
volunteered problems, complaints, or symptoms, are to be recorded. The need to capture this 
information is not dependent upon whether the clinical event is associated with GC4419 use. 
AEs resulting from concurrent illnesses, reactions to concurrent medications or symptomatic 
progression of disease states are also to be recorded. 
The information to be recorded for AEs will include: 
• The specific type of event in standard medical terminology – diagnosis if known, is 
preferred over symptoms 
• Duration of the clinical event (start and stop dates) 
• Severity (Grade 1, 2, 3, 4, or 5) of the clinical event 
• Seriousness (SAE) criteria, if applicable 
• Relationship of the AE to GC4419, RT and chemotherapy as defined in Section 11.3 
• Management of GC4419 administration and other action taken to alleviate the clinical 
events 
• Clinical outcome of the AE 
11.5. 
Follow-up of AEs and SAEs 
After the initial AE/SAE report, the investigator is required to proactively follow each patient 
and provide further information on the patient’s condition. The investigator will ensure that 
follow-up includes any supplemental investigations as may be indicated to elucidate the nature 
and/or causality of the AE or SAE. This may include additional laboratory tests or investigations, 
histopathological examinations, comparison to historical data on toxicity of chemoradiation in 
this study population or consultation with other health care professionals. 
Non-serious AEs that have not resolved by the end of the 30-Day Follow-up Period will be 
considered ongoing and marked as such in the CRF. All SAEs will be followed until they are 
resolved or a new baseline is established, at which point the appropriate CRF page(s) or SAE 
Report Form(s) will be updated.   

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Routine collection of AEs will stop at the end of the 30-Day Follow-up Period. 
As reasonably requested by the Sponsor, the investigator will perform or arrange for the conduct 
of supplemental measurements and/or evaluations to elucidate as fully as possible the nature 
and/or causality of the AE or SAE. If a patient dies during participation in the study or during a 
recognized follow-up period, Galera Therapeutics, Inc. will be provided with a copy of any 
post-mortem findings, including histopathology. 
11.6. 
Post-Study Reporting Requirements 
Although such information may not be routinely sought or collected by Galera Therapeutics, 
Inc., SAEs that occur after the patient has completed a clinical study may be reported. Such cases 
will be evaluated for expedited reporting. 
11.7. 
Pregnancy 
The risks of treatment with GC4419 during pregnancy have not been evaluated. Male subjects 
and female subjects of childbearing potential who engage in heterosexual intercourse should use 
a highly effective method of contraception starting at least on day prior to the first day of 
treatment and throughout the study and for 30 days (females) or 90 days (males) following the 
last dose of GC4419. 
All females will be considered as of childbearing potential unless they are postmenopausal (eg, 
amenorrheic for at least 12 consecutive months, in the appropriate age group, and without other 
known or suspected cause) or have been sterilized surgically (ie, bilateral tubal ligation, total 
hysterectomy, or bilateral oophorectomy, all with surgery at least 1 month before dosing). 
Subjects with a vasectomy or a vasectomized partner with confirmed azoospermia are eligible. 
If a subject of childbearing potential is neither surgically sterile nor postmenopausal, a highly 
effective contraceptive method (ie, a method that can achieve a failure rate of less than 1% per 
year when used consistently and correctly) must start either before and throughout the entire 
study period and for 30 days after the last dose of Test Article is administered.  Highly effective 
methods of contraception include any of the following: 
◦ 
total abstinence from heterosexual intercourse (if it is their preferred and usual lifestyle) 
◦ 
an intrauterine device or intrauterine hormone-releasing system (IUS) 
◦ 
a contraceptive implant 
◦ 
an oral contraceptive (Subject must be on a stable dose of the same oral contraceptive 
product for at least 28 days before dosing and throughout the study and for 28 days after 
study drug discontinuation)   
Pregnant and/or lactating females are excluded. 
 

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Pregnancies or exposure to study drug through breastfeeding must be reported as soon as 
possible but no later than 24 hours from the date the investigator becomes aware of the event. 
The contact information for the reporting of pregnancies and exposure to study drug through 
breastfeeding is provided in the Investigator Study File. The outcome of the pregnancy must be 
reported as soon as possible but no later than 24 hours from the date the investigator becomes 
aware of the outcome. 
A subject who becomes pregnant must be withdrawn from the study. 
11.7.1. 
Time Period for Collecting Pregnancy Information 
As permitted by IRB/EC/REB policies, any pregnancy that occurs from the first dose of GC4419 
up to 30 days after last dose should be reported using the appropriate form within 2 weeks of 
learning of the patient’s pregnancy. The patient will be followed throughout the course of the 
pregnancy. Generally, follow-up will be no longer than six to eight weeks following the 
estimated delivery date. Any premature termination of the pregnancy should be reported. If a 
pregnancy is identified outside the 30 days after last dose, the investigator may report using 
clinical judgment.  
11.7.2. 
Action to be Taken if Pregnancy Occurs in a Female Partner of a Male Patient 
The investigator will attempt to collect pregnancy information on any female partner of a male 
study patient who becomes pregnant while participating in this study. The investigator will 
record pregnancy information on the appropriate form and submit it to Galera Therapeutics, Inc. 
within 2 weeks of learning of the partner’s pregnancy. The partner will also be followed to 
determine the outcome of the pregnancy. Information on the status of the mother and child will 
be forwarded to Galera Therapeutics, Inc.. Generally, follow-up will be no longer than six to 
eight weeks following the estimated delivery date. Any premature termination of the pregnancy 
will be reported. If a pregnancy is identified outside the 30 days after last dose, the investigator 
may report using clinical judgment. 
11.8. 
Regulatory Reporting of Adverse Events 
Galera Therapeutics, Inc. will have final determination of reportability and is responsible for 
notifying the relevant regulatory authorities of certain events. The investigator will report all 
SAEs that occur at his/her site to the IRB per the site’s IRB regulations. AEs will be reported to 
regulatory authorities in compliance with 21 Code of Federal Regulations (CFR) 312.32, local and 
regional law and established guidance by the Sponsor or its designee. The format of the reports 
will be dictated by the local and regional requirements.  
Investigators will also be notified of all unexpected, serious, drug-related events (7/15 Day 
Safety Reports) that occur during the clinical trial. Each site is responsible for notifying its 
IRB/IEC/REB of these additional SAEs in accordance with local or central IRB/IEC/REB 
procedures. Copies of each report will be kept in the investigator’s files and adequate 
documentation will be provided to Galera Therapeutics, Inc. including documentation that the 
IRB/IEC/REB was notified of each safety report.  

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12. 
STATISTICS 
12.1. 
General Considerations 
A separate statistical analysis plan will provide technical details of the statistical analyses to be 
performed, in addition to the specifications in this protocol. 
All statistical analyses will be conducted with the SAS® software package version 9.2 or higher.  
12.2. 
Sample Size  
Approximately 60 subjects will be enrolled to ensure that 55 subjects are evaluable for the 
primary analysis, with an assumed proportion of early discontinuations without previous ≥ Grade 
2 esophagitis of approximately 10%.    
The incidence of ≥ Grade 2 esophagitis will be summarized and compared descriptively with 
historical controls based incidence rate of 30% for chemoradiotherapy alone (Palma 2013, Kwint 
2012, Fogh 2016).   
For illustration, with 55 patients in the primary analysis, the 95% Clopper-Pearson confidence 
interval around an observed incidence of > Grade 2 esophagitis (NCI-CTCAE) of 16% (9/55) 
would be 8% to 29%. 
Assuming that the true incidence of ≥ Grade 2 esophagitis in GC4419-treated subjects is 13%, 
the trial will have roughly 80% power with 55 subjects in the analysis to demonstrate incidence 
lower than 30% with a one-sided Type I error rate of 2.5%. 
12.3. 
Analysis Populations 
The primary efficacy population will include all subjects who receive at least one dose of 
GC4419 and either a) complete their RT course or b) discontinue their RT course early but are 
known to have had acute radiation esophagitis. Sensitivity analyses will also be performed to 
assess the effect on estimated incidence when including GC4419-treated subjects who did not 
complete their RT course and did not have observed acute radiation esophagitis before 
discontinuing. Safety analyses will include all subjects who receive at least one dose of GC4419. 
Efficacy and safety may also be summarized for a “per protocol” population of subjects 
completing RT/chemotherapy and at least 5 weeks of GC4419.   
12.4. 
Definition of Endpoints 
12.4.1. 
Primary Endpoint 
Incidence of acute radiation esophagitis (≥ Grade 2; NCI-CTCAE version 5 through the end of 
chemoradiotherapy for NSCLC or SCLC when GC4419 is added. 
12.4.2. 
Secondary Efficacy Endpoints 
• Incidence of acute severe (Grade 3-4) radiation esophagitis by the NCI-CTCAE scale 
(Grade 3-4) through the completion of chemoradiotherapy; 

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• Incidence of acute esophagitis ≥ Grade 2 through 4 weeks after completion of 
chemoradiotherapy, using the NCI-CTCAE scale; 
• Incidence of acute severe (Grade 3-4) radiation esophagitis through 4 weeks after 
completion of chemoradiotherapy; 
• Presence of acute (≥ Grade 2) and acute severe (Grade 3-4) radiation esophagitis at 
evaluation 4 weeks after completion of chemoradiotherapy; 
• Incidence of acute (through 90 days after radiation therapy) radiation pneumonitis, 
≥ Grade 2 by the NCI-CTCAE scale; 
• Percentage weight change from baseline through the completion of chemoradiotherapy  
and 4 weeks after treatment. 
12.4.3. 
Exploratory Endpoints 
• Severity of radiation esophagitis-related pain, dysphagia, and dyspepsia during combined 
chemotherapy and RT using these fields of the NCI PRO-CTCAE weekly during 
treatment, and 4 weeks after completion of chemoradiotherapy; 
• Incidence of acute esophagitis > Grade 2 through 4 weeks after completion of 
chemoradiotherapy, using the RTOG scale; 
• Incidence of acute severe (Grade 3-4) radiation esophagitis through 4 weeks after 
completion of chemoradiotherapy, using the RTOG scale; 
• Patient-reported dysphagia via a daily patient log and need for parenteral or tube feeding; 
• Opioid use by collecting the patient’s analgesic/narcotic use in the previous 24-hour 
period at each weekly evaluation. 
12.5. 
Safety Analysis 
Adverse events will be grouped by system organ class, high level term, and preferred term 
according to the Medical Dictionary for Regulatory Activities (MedDRA) dictionary. Incidence 
by subject will be tabulated for all treatment emergent, serious, severe, and treatment-related 
AEs. Detailed listings will be provided for all SAEs, deaths, and withdrawals due to AEs. 
Laboratory measurements, vital signs, and ECG parameters will be summarized by treatment 
group at each of the protocol specified time points.  
Further details will be provided in the trial’s statistical analysis plan.  
12.5.1. 
Interim Safety Analysis/Study Stopping Rules 
An interim assessment of safety will be made by a study review group consisting of the Principal 
Investigator, the Galera Medical monitor, the CRO medical monitor, and other attendees as 
deemed appropriate.  For this assessment, descriptive safety data will be reviewed after 15 
patients have completed study treatment.  In the event that any of the following occur, 
enrollment to the study will be suspended pending full review of all safety data to determine next 
steps: 

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• 
Radiation delay of  >  7 days in > 20 % of patients 
• 
Chemotherapy delays of > 7 days for non-hematologic toxicity, or discontinuation of 
chemotherapy for hematologic toxicities in >20% of patients.  
• 
Progression of malignancy within 3 months of enrollment in > 20% of patients 
• 
Discontinuation of treatment due to treatment-related AEs (GC4419 or 
chemoradiotherapy) within 3 months of enrollment  > 33% of patients. 
Safety will be assessed on an on-going basis by the CRO Medical Monitor and Galera MM, who 
may call for an unscheduled safety review by the study review group at any time. 
12.6. 
Primary Efficacy Analysis 
Incidence of acute radiation esophagitis (≥ Grade 2) will be presented descriptively along with 
95% Clopper-Pearson exact confidence intervals. The incidence will be formally tested against 
30% by a binomial test using the “exact binomial;” statement in SAS’s Frequency procedure 
(PROC FREQ). 
12.6.1. 
Multiplicity 
Because the trial has only one primary endpoint and because the secondary endpoints are only 
descriptively presented, no accounting for multiple comparisons is planned.  
12.6.2. 
Handling of Missing Data 
Investigators should make reasonable attempts to continue to collect Esophagitis RTOG and 
CTCAE scores for inclusion in the study database for subjects who discontinue from study drug 
but continue to receive further RT fractions.  
The trial’s statistical analysis plan will discuss the imputation strategy for subjects who lack 
Esophagitis scores, who discontinue from the trial without complete follow-up of Esophagitis 
scores, and whose resolution date of severe Esophagitis is unknown.  
12.7. 
Secondary Efficacy Analyses 
12.7.1. 
Incidence Endpoints 
Secondary incidence endpoints will be presented descriptively along with 95% Clopper-Pearson 
exact confidence intervals. Each incidence endpoint will have an analysis population that 
includes all subjects who receive at least one dose of GC4419 and either a) complete the 
follow-up period for the endpoint or b) discontinue follow-up early but are known to have had 
the endpoint. 
12.7.2. 
Percentage Weight Change from Baseline Through the End of Treatment and 
4 Weeks After Treatment 
Percentage weight change through both periods will be descriptively summarized with univariate 
statistics.  

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13. 
DIRECT ACCESS TO SOURCE DATA/DOCUMENTS 
13.1. 
Study Monitoring 
In accordance with International Conference on Harmonisation Good Clinical Practice (ICH 
GCP) guidelines, the study monitor must have direct access to the investigator’s source 
documentation in order to verify the consistency of the data recorded in the electronic CRFs. 
The monitor is responsible for routine review of the electronic CRFs 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 full access to any patient 
records needed to verify the entries on the electronic CRFs. The investigator agrees to cooperate 
with the monitor to assure that any follow-up items identified in the course of these monitoring 
visits are resolved. 
During site visits, the monitor will: 
• Check the progress of the study; 
• Review study data collected; 
• Conduct source document verification; 
• Identify any issues and address their resolution; 
• This will be done in order to verify that the: 
o Data are authentic, consistent, accurate, and complete; 
o Safety and rights of subjects are being protected; 
o Study is conducted in accordance with the currently approved protocol (and any 
amendments), GCP, and all applicable regulatory requirements. 
The investigator agrees to allow the monitor direct access to all relevant documents and to 
allocate his/her time and the time of his/her staff to the monitor to discuss findings and any 
relevant issues. 
13.2. 
Audits and Inspections 
Authorized representatives of Galera Therapeutics, Inc., a regulatory authority, an IEC or an IRB 
may visit the site to perform audits or inspections, including source data verification. The 
purpose of a Galera Therapeutics, Inc. audit or inspection is to systematically and independently 
examine all study-related activities and documents to determine whether these activities were 
conducted, and data were recorded, analyzed, and accurately reported according to the protocol, 
GCP guidelines of the ICH, and any applicable regulatory requirements. The investigator should 
contact Galera Therapeutics, Inc. immediately if contacted by a regulatory agency about an 
inspection. 
13.3. 
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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In general, major protocol deviations include deviations from inclusion/exclusion criteria, from 
concomitant medication restrictions, and from any other protocol requirement that could, at least 
hypothetically, result in significant risk to the subject and/or affect the outcome of the clinical 
trial. Major protocol deviations will be noted in the final Clinical Summary Report.   
A minor deviation is defined as non-adherence to the protocol procedures or schedule as defined 
by the protocol or the primary endpoint that does not place the subject at any added or significant 
risk or affect the data quality or the outcome of the clinical trial (eg, a missed procedure, an 
out-of-window site visit).   
Only subjects who meet protocol-defined eligibility criteria may be enrolled in this clinical trial. 
If any protocol eligibility criteria or procedures are unclear, the investigator or investigational 
site personnel should contact the Clinical Research Associate. If the question requires medical 
interpretation, the sponsor’s medical monitor should be consulted. All protocol deviations should 
be reported to the IRB/IEC according to the standard practices of the investigational site and 
applicable regulatory requirements.  
13.4. 
Protocol Modifications 
Protocol modifications, except those intended to reduce immediate risk to study subjects, may be 
made only by Galera Therapeutics, Inc. or its representatives. All protocol modifications must be 
submitted to the IRB/IEC/REB and regulatory authorities in accordance with local requirements. 
Approval must be obtained before changes can be implemented. 
13.5. 
Information Disclosure 
13.5.1. 
Ownership 
All information provided by Galera Therapeutics, Inc. or its representatives, and all data and 
information generated by the site as part of the study (other than a subject’s medical records), are 
the sole property of Galera Therapeutics, Inc. 
13.5.2. 
Confidentiality 
All information provided by Galera Therapeutics, Inc. or its representatives, and all data and 
information generated by the site as part of the study (other than a subject’s medical records) will 
be kept confidential by the investigator and other site staff. Information related to this study is 
subject to the confidentiality provisions of the Clinical Research Agreement between the 
investigative site and Galera Therapeutics, Inc. 
13.5.3. 
Publication 
All publication or presentation rights for the findings of the clinical investigation under this 
protocol shall be governed by the appropriate terms of the Clinical Research Agreement between 
the investigational site and Galera Therapeutics, Inc. 

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14. 
QUALITY CONTROL AND QUALITY ASSURANCE 
The study will be monitored and managed in accordance with ICH GCP E6. 
To ensure compliance with GCPs and all applicable regulatory requirements, Galera 
Therapeutics, Inc. or its representatives may conduct a quality assurance audit. Regulatory 
agencies may also conduct a regulatory inspection of this study. Such audits/inspections can 
occur at any time during or after completion of the study. If an audit or inspection occurs, the 
investigator and institution agree to allow the auditor/inspector direct access to all relevant 
documents and to allocate his/her time and the time of his/her staff to the auditor/inspector to 
discuss findings and any relevant issues. 

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15. 
ETHICS 
15.1. 
Ethical Conduct of the Study 
The investigator will ensure that this study is conducted in full compliance with the principles of 
the “Declaration of Helsinki” (version October 2008), ICH guidelines, in particular ICH GCP 
E6, or with the laws and regulations of the country in which the research is conducted, whichever 
affords the greatest protection to the study patient. The investigator will also assure that the basic 
principles outlined in “ICH Guideline for Good Clinical Practice” as published in the Federal 
Register May 9, 1997, and all applicable Federal regulations including 21 CFR parts 50, 54, 56, 
and 312 are adhered to. 
15.2. 
Institutional Review Board (IRB)/Independent Ethics Committee 
(IEC)/Research Ethics Board (REB) Approval 
This protocol and any accompanying material to be provided to the patient (such as 
advertisements, patient information sheets, or descriptions of the study used to obtain informed 
consent) will be submitted, by the investigator, to an IRB/IEC/REB. Approval from the 
IRB/IEC/REB must be obtained, and a copy must be provided to Galera Therapeutics, Inc. or its 
representatives before initiating the conduct of any study procedures including screening or 
enrolling any subjects into the trial. 
No modifications or deviations from this protocol other than those that are deemed medically 
necessary by the Principal Investigator or designated sub-investigator are to be made. Any 
protocol deviations will be reported to Galera Therapeutics, Inc. and to the IRB/IEC/REB in 
accordance with its reporting policy. 
Any modifications made to the protocol by the sponsor after receipt of IRB/IEC/REB approval 
must be submitted to the committee for approval prior to implementation. 
15.3. 
Written Informed Consent 
In accordance with regulatory and local IRB/IEC/REB requirements, before study procedures are 
performed, subjects will be informed about the study and required to sign the IRB/IEC/REB 
approved ICF. This form will be signed after adequate explanation of the aims, methods, 
objective and potential hazards of the study and prior to undertaking any study-related 
procedures. The Sponsor or its designee will provide an ICF template to the investigator. The 
Sponsor or its designee must approve changes to the ICF template prior to submission to the 
IRB/IEC/REB. Informed consent will be obtained according to the applicable IRB/IEC/REB 
requirements. No patient is to be screened or treated until an ICF, written in a language in which 
the patient is fluent, has been obtained. The signed ICF will be retained with the study records. 
Each patient will also be given a copy of his/her signed ICF.  

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16. 
DATA HANDLING AND RECORDKEEPING 
16.1. 
Case Report Forms 
All required study data must be recorded on the electronic CRF provided by Galera 
Therapeutics, Inc. or its representatives. The data recorded onto the electronic CRF is derived 
from the source documents. The investigator shall ensure that all data in the electronic CRF is 
accurate and consistent with the source documents or that any discrepancies of the electronic 
CRF with source documents are explained (ICH E6 4.9.2).   
Electronic CRFs will be accessed by the study center for collection of all study data, and a copy 
of the electronic CRF will be provided to the site for the investigator files. For each patient who 
receives study drug, the electronic CRF must be completed by site staff and must be signed 
electronically by the principal investigator in a timely fashion after data collection. If a patient 
withdraws from the study, the electronic CRFs should be promptly completed and the reason for 
withdrawal must be noted. If a patient is withdrawn from the study because of a drug-related 
toxicity, thorough efforts should be made to clearly document the outcome. 
The sponsor will ensure that the electronic CRF selected meets the requirements per ICH E6 R2 
regarding data collection and handling, system maintenance, system security measures, change 
control, data backup, recovery, contingency planning, and decommissioning. 
16.2. 
Retention/Inspection 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. 
Records of drug receipt and disposition, electronic file of CRFs, source documents, reports of 
this investigation and other study documentation must be maintained by the investigator for a 
period of at least two years following the date on which the investigational drug is approved by 
FDA or other applicable regulatory agency for marketing for the purposes that were the subject 
of the clinical investigations. If no application is to be filed, records must be retained until two 
years following the date that the study is discontinued, and the FDA or other applicable 
regulatory agency is notified. If the application is not approved by the FDA or other applicable 
regulatory agency for such indication, records must be retained for two years after notification by 
Galera Therapeutics, Inc. of the FDA or other applicable regulatory agency decision. The records 
must be available for copying and inspection if requested by regulatory authorities.   
Galera Therapeutics, Inc. should be notified in writing at least 30 days prior to the disposal or 
transfer to another location or party of any study records related to this protocol. 

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17. 
LIST OF REFERENCES 
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radiochemotherapy-induced esophagitis with glutamine: results of a pilot study. Int J Radiat 
Oncol Biol Phys. 2007;69(2):342-349.Baker S, Fairchild A. Radiation-induced esophagitis in 
lung cancer. Lung Cancer. 2016:7:119–127. 
Antonadou D, Coliarakis N, Synodinou M, Athanassiou H, Kouveli A, Verigos C, et al. 
Randomized phase III trial of radiation treatment þ/- amifostine in patients with advanced-stage 
lung cancer. Int J Radiat Oncol Biol Phys. 2001;51:915-922. 
Antonadou D. Radiotherapy or chemotherapy followed by radiotherapy with or without 
amifostine in locally advanced lung cancer. Semin Radiat Oncol. 2002;12:50-58 
Baker S, Fairchild A. Radiation-induced esophagitis in lung cancer. Lung Cancer. 
2016:7:119-127. 
Ball D, Bishop J, Smith J, Crennan E, O'Brien P, Davis S, et al. A phase III study of accelerated 
radiotherapy with and without carboplatin in nonsmall cell lung cancer: An interim toxicity 
analysis of the first 100 patients. Int J Radiat Oncol Biol Phys 1995;31:267-272. 
Belani CP, Choy H, Bonomi P, Scott C, Travis P, Haluschak J, et al. Combined 
chemoradiotherapy regimens of paclitaxel and carboplatin for locally advanced non-small-cell 
lung cancer: a randomized phase II locally advanced multi-modality protocol. J Clin Oncol. 
2005;23:5883–5891. 
Bradley JD, Paulus R, Komaki R, Masters G, Blumenschein G, Schild S, et al. Standard-dose 
versus high-dose conformal radiotherapy with concurrent and consolidation carboplatin plus 
paclitaxel with or without cetuximab for patients with stage IIIA or IIIB non-small-cell lung 
cancer (RTOG 0617): a randomised, two-by-two factorial phase 3 study. Lancet Oncol. 2015; 
16:187–99 
Byhardt RW, Scott C, Sause WT, Emami B, Komaki R, Fisher B, et al. Response, toxicity, 
failure patterns, and survival in five radiation therapy oncology group (RTOG) trials of 
sequential and/or concurrent chemotherapy and radiotherapy for locally advanced non-small-cell 
carcinoma of the lung. Int J Radiat Oncol Biol Phys 1998;42:469-478. 
Choy H, LaPorte K, Knill-Selby E, Mohr P, Shyr Y. Esophagitis in combined modality therapy 
for locally advanced non-small cell lung cancer. Semin Radiat Oncol. 1999;9(2 Suppl 1):90-96. 
Curran WJ, Paulus R, Langer CJ, Komaki R, Lee JS, Hauser S, et al. Sequential vs. concurrent 
chemoradiation for stage III non-small cell lung cancer: randomized phase III trial RTOG 9410. 
J Natl Cancer Inst. 2011;103(19):1452-60. 
Emami B. Three-dimensional conformal radiation therapy in bronchogenic carcinoma. Semin 
Radiat Oncol 1996;6:92-97. 

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Epperly MW, Carpenter M, Agarwal A, Mitra P, Nie S, Greenberger JS. Intraoral manganese 
superoxide dismutase-plasmid/liposome (MnSOD-PL) radioprotective gene therapy decreases 
ionizing irradiationinduced murine mucosal cell cycling and apoptosis. In Vivo. Jul-Aug 
2004;18(4):401-410. 
Fogh SE, Deshmukh S, Berk LB, Dueck AC, Roof K, Yacoub S. A randomized Phase 2 trial of 
prophylactic manuka honey for the eeduction of chemoradiation therapy-induced esophagitis 
during the treatment of lung cancer: Results of NRG Oncology RTOG 1012. Int J Radiation 
Oncol Biol Phys. 2017;97(4):786-796 
Ito H, Meistrich ML, Barkley HT Jr, Thames HD Jr, Milas L. Protection of acute and late 
radiation damage of the gastrointestinal tract by WR-2721. Int J Radiat Oncol Biol Phys. 1986 
Feb;12(2):211-9. 
Koukourakis M, Hlouverakis G, Kosma L, Skarlatos J, Damilakis J, Giatromanolaki A, et al. The 
impact of overall treatment time on the results of radiotherapy for non small cell lung carcinoma. 
Int J Radiat Oncol Biol Phys. 1996;34:315-322. 
Koukourakis MI, Flordellis CS, Giatromanolaki A, Koukouraki S, Kapsoritakis A, Potamianos 
S, et al. Oral administration of recombinant human granulocyte macrophage colony-stimulating 
factor in the management of radiotherapy-induced esophagitis. Clin Cancer Res. Dec 
1999;5(12):3970-3976. 
Kwint M, Uyterlinde W, Nijkamp J, et al. Acute Esophagus Toxicity in Lung Cancer Patients 
After Intensity Modulated Radiation Therapy and Concurrent Chemotherapy. Int J Radiation 
Oncol Biol Phys, Vol. 84, No. 2, pp. e223ee228, 2012 0360-3016 
Langer CJ. Concurrent chemoradiation using paclitaxel and carboplatin in locally advanced non-
small cell lung cancer. Semin Radiat Oncol. Apr 1999;9(2 Suppl 1):108-116. 
Martel MK, et al. Incidental doses to clinically negative nodes from conformal treatment fields 
for non-small cell lung cancer. Int J Rad Oncol Biol Phys. 45(3 (supplement)): 244, 1999. 
Michalowski A, Hornsey S. Assays of damage to the alimentary canal. Br J Cancer Suppl. 
1986;7:1-6. 
Milas L, Nishiguchi I, Hunter N, Murray D, Fleck R, Ito H, et al. Radiation protection against 
early and late effects of ionizing irradiation by the prostaglandin inhibitor indomethacin. Adv 
Space Res. 1992;12:265-271. 
Movsas B, Scott C, Langer C, Werner-Wasik M, Nicolaou N, Komaki R, et al. Randomized trial 
of amifostine in locally advanced non-small-cell lung cancer patients receiving chemotherapy 
and hyperfractionated radiation: radiation therapy oncology group trial 98-01. J Clin Oncol. 2005 
Apr 1;23(10):2145-54. 
Murphy CK, Fey EG, Watkins BA, et al. Efficacy of superoxide dismutase mimetic M40403 in 
attenuating radiation-induced oral mucositis in hamsters. Clin Cancer Res. 2008;14:4292-7. 

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National Cancer Institute; National Institute of Health; Department of Health and Human 
Service. Common Terminology for Adverse Events (CTCAE); Version 5.0. Available from: 
November 27, 2017. Available from: 
https://ctep.cancer.gov/protocolDevelopment/electronic_applications/docs/CTCAE_v5_Quick_R
eference_8.5x11.pdf. Accessed February 18, 2019. 
Nicolopoulos N, Mantidis A, Stathopoulos E, Papaodysseas S, Kouvaris J, Varveris H, et al. 
Prophylactic administration of indomethacin for irradiation esophagitis. Radiother Oncol. 
1985;3:23-25. 
Palma DA, Senan S, Tsujino K, et al. Predicting radiation pneumonitis after chemoradiation 
therapy for lung cancer: an international individual patient data meta-analysis. Int J Radiat Oncol 
Biol Phys. 2013;85(2):444-450. doi:10.1016/j.ijrobp.2012.04.043 
Radiation Therapy Oncology Group/European Organisation for Research and Treatment of 
Cancer Late Radiation Morbidity Scoring Schema. Updated 2019. Available at: 
https://www.rtog.org/ResearchAssociates/AdverseEventReporting/RTOGEORTCLateRadiation
MorbidityScoringSchema.aspx. Accessed February 18, 2019. 
Sonis ST. Mucositis as a biological process: a new hypothesis for the development of 
chemotherapy-induced stomatotoxicity. Oral Oncology. 1998;34:39-43. 
Turrisi AT 3rd, Kim K, Blum R, Sause WT, Livingston RB, Komaki R, et al. Twice-daily 
compared with once-daily thoracic radiotherapy in limited small-cell lung cancer treated 
concurrently with cisplatin and etoposide. N Engl J Med. 1999;340:265-271. 
Vivek Verma 1, Charles B. Simone II 2 and MariaWerner-Wasik Review. Acute and Late 
Toxicities of Concurrent Chemoradiotherapy for Locally-Advanced Non-Small Cell Lung 
Cancer. Cancers 2017, 9, 120; doi:10.3390/cancers9090120Vokes EE, Herndon JE, 2nd, 
Crawford J, Leopold KA, Perry MC, Miller AA, et al. Randomized phase II study of cisplatin 
with gemcitabine or paclitaxel or vinorelbine as induction chemotherapy followed by 
concomitant chemoradiotherapy for stage IIIB non-small-cell lung cancer: cancer and leukemia 
group B study 9431. J Clin Oncol. 2002;20(20):4191-4198. 
Werner-Wasik M, Pequignot E, Leeper D, Leeper D, Hauck W, Curran W. Predictors of severe 
esophagitis include use of concurrent chemotherapy, but not the length of irradiated esophagus: 
A multivariate analysis of patients with lung cancer treated with nonoperative therapy. Int J 
Radiat Oncol Biol Phys. 2000;48:689-696. 
Werner-Wasik M, Axelrod RS, Friedland DP, Hauck W, Rose LJ, Chapman AE, et al. 
Preliminary report on reduction of esophagitis by amifostine in patients with non-small cell lung 
cancer treated with chemoradiotherapy. Clin Lung Cancer. 2001;2:284-289. Discussion 290. 
Werner-Wasik M, Axelrod RS, Friedland DP, Hauck W, Rose LJ, Chapman AE, et al. Phase II: 
Trial of twice weekly amifostine in patients with non-small cell lung cancer treated with 
chemoradiotherapy. Semin Radiat Oncol. 2002;12:34-39. 

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Xiao Y, Werner-Wasik M, Michalski D, Houser C, Bednarz G, Curran W, et al. Comparison of 
three IMRT inverse planning techniques that allow for partial esophagus sparing in patients 
receiving thoracic radiation therapy for lung cancer. Med Dosim. 2004;29:210-216. 

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APPENDIX 1. SCHEDULE OF ASSESSMENTS 
Assessments 
Screening 
Phase 
Active Phase 
Post Active Phase 
Within 
28 days 
of RT 
start 
Baseline 
RT Day 
1 
Wk 1 
Days 2-
7 
Wk 2 
Days 8-1
4 
Wk 3 
Days 
15-21 
Wk 4 
Days 22-2
8 
Wk 5 
Days 
29-35 
Wk 6 
Days 
36-42 
Last Day 
of RT or 
Early 
Term1 
4 weeks 
from Last 
Day of RT 
(± 15 
Days) 
90 Days 
Post-RT 
(± 15 
Days)  
6, 9, 12 
months 
post 
treatment 
(+ 30 days) 
Informed consent 
X 
 
 
 
 
 
 
 
 
 
 
 
Inclusion/exclusion criteria 
X 
X 
 
 
 
 
 
 
 
 
 
 
Medical history2 
X 
X 
 
 
 
 
 
 
 
 
 
 
Complete Physical Exam 
X 
 
 
 
 
 
 
 
X 
X 
X 
X 
Height/Record BSA 
X 
 
 
 
 
 
 
 
 
 
 
 
Symptom-directed Physical Exam 
 
 
 
 
 
X 
 
 
 
 
 
 
Vital signs, ECOG and weight 
X 
X 
 
 
 
X 
 
 
X 
X 
 
 
Serum pregnancy test 
X 
 
 
 
 
 
 
 
 
 
 
 
Concomitant medications3 
 
X 
Weekdays 
X 
X 
 
 
Adverse Events4 
 
X 
Weekdays 
X 
X 
X3 
 
Pneumonitis Assessment5: NCI-
CTCAE scale, CT Scan, spirometry, 
and DLCO 
X 
 
 
 
 
 
 
 
X 
 
X 
 
Tumor assessment (Chest CT with or 
without contrast) 
X 
 
 
 
 
 
 
 
 
 
X 
X 
ECG (12-lead) 6 
X 
 
 
 
 
 
 
 
 
 
 
 
Esophagitis assessment—CTCAE7 
X 
X 
Weekdays 
X 
X 
 
 
Esophagitis assessment—RTOG7 
X 
X 
Weekdays 
X 
X 
 
 
Patient reported outcomes: 
NCI-PRO-CTCAE, NPRS8 
X 
X 
 
X 
X 
X 
X 
X 
X 
X 
 
 
Patient-reported swallowing diary9 
X 
X 
Daily including weekends 
X 
X 
 
 
Analgesic/narcotic use reporting 
 
X 
X 
Weekly 
X 
X 
 
 
Parenteral/tube feeding use reporting 
 
 
X 
Weekly 
X 
X 
 
 
Blood draw: Lab safety tests10 
X 
X 
X 
X 
X 
X 
X 
X 
X11 
X 
 
 
Blood draw: PK12 
 
X 
X 
 
 
X 
 
 
 
 
 
 
RT + chemotherapy parameters 
recorded 
X 
Per protocol schedule/standard regimen 
 
 
 
 
Dosing GC441913 
 
X 
Days 
2-5 
Days 
8-12 
Days 
15-19 
Days 
22-26 
Days 
29-33 
Days 
36-40 
 
 
 
 

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BSA = Body Surface Area, CTCAE = Common Terminology Criteria for Adverse Events, DLCO = diffusing capacity of the lungs for carbon monoxide, ECG = Electrocardiogram, ECOG = Eastern 
Cooperative Oncology Group, NCI-PRO-CTCAE = National Cancer Institute-Patient Reported Outcome- Common Terminology Criteria for Adverse Events, NPRS = Numeric Pain Rating Scale, 
RT = Radiation Therapy, RTOG = Radiation Therapy Oncology Group. 
1 
If a subject ends study participation early and/or withdraws consent after first dose of GC4419, all last day of RT procedures should be completed. 
2  
Medical History should include NSCLC or SCLC cancer history including prior treatments and confirmation of histopathological diagnosis  
3 
All concomitant therapies (eg, prescription and over-the-counter medications) taken by subjects on or after the date of baseline through 30 days following the last GC4419, RT or chemotherapy (ie, 
whichever occurs last) dose will be collected in the CRF. Additionally, any concomitant therapies if used to treat any serious or related adverse event will be recorded in the CRF. 
4 
All AEs and SAEs with onset dates on or after baseline through 30 days following the last GC4419, RT or chemotherapy (ie, whichever occurs last) dose will be recorded on the CRF. All subjects 
with SAEs will be followed until the events resolve or a new baseline is established. All subjects will be evaluated for acute RT pneumonitis, ≥ Grade 2 through 90 days after radiation therapy. Any 
adverse medical condition or laboratory abnormality with an onset date before the date of the baseline visit is pre-existing in nature, and part of the subject’s medical history. 
5 
If Spirometry and DLCO have been performed as standard of care prior to screening and within 56 days of RT start, these tests can be used for inclusion. 
6 
If an ECG has been performed as standard of care prior to screening and within 56 days of RT start, this test can be used for inclusion 
7 
Toxicity by CTCAE for AEs, and esophagitis by CTCAE criteria, will be assessed at each treatment visit and 4 weeks after completion of treatment.  
8 
Patient Reported Outcome questionnaires (PROs), NCI-PRO-CTCAE and NPRS will be completed once within one week of baseline or during the baseline visit prior to dosing. PROs will 
subsequently  be completed once weekly during all RT weeks. PROs are to be completed prior to esophagitis assessment.  
9 
Patient reported swallowing diary will be completed once within one week of baseline or during the baseline visit prior to dosing. The swallowing diary will be completed daily (including 
weekends) during treatment, and daily until the 4 weeks RT follow-up visit. 
10 
Clinical laboratory measurements will be conducted at the Screening Visit, twice during Week 1 (once at the Baseline Visit and again on Days 3, 4, or 5), and once weekly from Week 2 through 
the last day of RT. Clinical laboratory measurements at these visits will include the hematology profile (hemoglobin, hematocrit, red blood cell count, white blood cell count with differential, and 
platelet count. Differential to include total neutrophils, lymphocytes, monocytes, eosinophils, and basophils) and serum chemistry profile (glucose, BUN, creatinine, sodium, potassium, calcium, 
albumin, total protein, total bilirubin, direct bilirubin, alkaline phosphatase, ALT [SGPT], AST [SGOT], chloride, phosphate, bicarbonate). 
11 
If safety labs have already been drawn during the study week in which the last day of RT or early termination visit falls, then lab safety tests (chemistry and hematology profiles) do not need to be 
conducted on the last day of RT or at the early termination visit. If safety labs have not been drawn during the current study week at the time of the early termination visit or on the last day of RT, then 
safety labs should be drawn on that day. Safety labs only need to be drawn once per study week after Week 1. 
12 
Blood samples will be collected for GC4419 pharmacokinetic (PK) measurements at Baseline (Day 1), Day 2, and Day 22. See Table 3 for additional information. 
13 
GC4419 will be administered Monday through Friday, beginning at Baseline (RT Day 1) and through Study Day 42 (end of RT). RT should begin no longer than 60 min following the end of the 
GC4419 infusion. If RT is not received on any given day due to a treatment break or unforeseen circumstances, GC4419 should not be administered on that day. Subjects should resume GC4419 
administration when RT resumes. 
 

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APPENDIX 2. ESOPHAGITIS NCI-CTCAE & RTOG SCORING 
Grade 
NCI-CTCAE 
RTOG 
1 
Asymptomatic; clinical or diagnostic 
observations only; intervention not 
indicated 
Mild dysphagia or odynophagia, may 
require topical anesthetic, non-narcotic 
agents or soft diet 
2 
Symptomatic; altered 
eating/swallowing; oral supplements 
indicated 
Moderate dysphagia or odynophagia, 
may require narcotic agents or liquid 
diet 
3 
Severely altered eating/swallowing; 
tube feeding, TPN or hospitalization 
indicated 
Severe dysphagia or odynophagia with 
dehydration or weight loss (> 15% of 
pretreatment baseline), requiring 
nasogastric feeding, IV fluids, or 
hyperalimentation 
4 
Life-threatening consequences; urgent 
operative intervention indicated  
Complete stricture, ulceration, 
perforation, or fistula 
5 
Death 
Death 
IV = intravenous, NCI-CTCAE = National Cancer Institute -Common Terminology Criteria for Adverse Events, 
RTOG = Radiation Therapy Oncology Group, TPN = total parenteral nutrition. 
Sources: NCI-CTCAE 5.0 (2017); Radiation Oncology Toolbox (2017). 
 

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APPENDIX 3. PERFORMANCE STATUS CONVERSION 
Performance Status Conversion: Eastern Cooperative Oncology Group (ECOG) - Karnofsky  
ECOG 
Karnofsky 
Score 
Description 
Score 
Description 
0 
Fully active, able to carry on all pre-
disease performances without restriction. 
100 
Normal, no complaints, no evidence of disease 
90 
Able to carry on normal activity, minor signs or 
symptoms of disease. 
1 
Restricted in physically strenuous 
activity, but ambulatory and able to 
carry out work of a light or sedentary 
nature, office work 
80 
Normal activity with effort, some signs or 
symptoms of disease 
70 
Cares for self, unable to carry on normal activity or 
do active work 
2 
Ambulatory and capable of all self-care, 
but unable to carry out any work 
activities; Up and about more than 50% 
of waking hours 
60 
Requires occasional assistance, but is able to care 
for most of his/her needs 
50 
Requires considerable assistance and frequent 
medical care 
3 
Capable of only limited self-care, 
confined to bed or chair more than 50% 
of waking hours 
40 
Disabled, requires special care and assistance 
30 
Severely disabled, hospitalization indicated; Death 
not imminent 
4 
Completely disabled; Cannot carry on 
any self-care; Totally confined to bed or 
chair 
20 
Very sick, hospital indicated, death not imminent 
10 
Moribund, fatal processes progressing rapidly 
5 
Death 
0 
Death 

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APPENDIX 4. NATIONAL CANCER INSTITUTE-COMMON 
TERMINOLOGY CRITERIA FOR ADVERSE EVENTS, VERSION 5.0 
See the following website link for the complete NCI-CTCAE, Version 5.0: 
https://ctep.cancer.gov/protocolDevelopment/electronic_applications/docs/CTCAE_v5_Quick_R
eference_8.5x11.pdf 
 
 

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APPENDIX 5. NUMERIC PAIN RATING SCALE 
 
 

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APPENDIX 6. PATIENT SWALLOWING DIARY 
Patient Swallowing Diary 
Instructions for the patient: This is a calendar on which you are to record your swallowing 
ability each day of the week. 
Be sure to turn in the sheets at the end of each week during treatment, and at 12 weeks 
from the start of treatment to the contact person listed below. 
You will fill out a column by adding the date, by writing in one number that reflects your 
swallowing, before treatment begins, each day during radiation treatment, at end of treatment, 
and at 12 weeks after radiation completion of radiation. 
You will receive at least 9 pages, one for each week and some extras. It is very important that we 
know how you feel, especially concerning your swallowing. If you have comments, be sure to 
add them to the page. 
Please sign your name and date at the bottom of each page turned in. 
If you have any questions, 
Contact: _______________________________________     Telephone:___________________ 
HAVE YOU HAD ANY PROBLEMS WITH SWALLOWING TODAY? 
DATE 
  
  
  
  
  
  
  
  
DAY OF WEEK 
Pretreatment 
Mon 
Tues 
Wed 
Thur 
Fri 
Sat 
Sun 
  
  
  
  
  
  
  
  
  
1 = None 
  
  
  
  
  
  
  
  
2 = Mild 
soreness only 
  
  
  
  
  
  
  
  
3 = Can swallow 
solids with some 
difficulty 
  
  
  
  
  
  
  
  
4 = Cannot 
swallow solids 
  
  
  
  
  
  
  
  
5 = Cannot 
swallow liquids 
  
  
  
  
  
  
  
  
 
COMMENTS:  
 
Patient Signature: ______________________________  
Date: ______________________ 
 

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APPENDIX 7. EXAMPLES OF CYP2D6-SUBSTRATE DRUGS 
Beta-Blockers 
Antidepressants 
Antipsychotics 
Others 
carvedilol 
amitriptyline 
haloperidol 
aripiprazole 
S-metoprolol 
clomipramine 
risperidone 
atomoxetine 
propafenone 
desipramine 
thioridazine 
codeine 
timolol 
duloxetine 
 
dextromethorphan 
 
fluoxetine 
 
doxepine 
 
imipramine 
 
flecainide 
 
paroxetine 
 
mexiletine 
 
 
 
ondansetron 
 
 
 
oxycodone 
 
 
 
risperidone 
 
 
 
tamoxifen 
 
 
 
tramadol 
 
 
 
venlafaxine 
Source: https://drug-interactions.medicine.iu.edu/Clinical-Table.aspx.