Conditions: Oesophageal Adenocarcinoma Squamous Cell Carcinoma Solid Tumor
Keywords: Oesophageal cancer
Allocation: NA | Intervention model: SINGLE_GROUP
Enrollment: 36
Healthy volunteers: no

Brief summary:
This Phase I study will test the combination of a novel ATR inhibitor (M6620) with chemoradiotherapy in oesophageal cancer; utilizing three experimental cohorts (Stage A1, A2 and B).

Detailed description:
There is strong scientific rationale for combining ATR inhibitors with DNA damaging agents such as radiation and cisplatin. In particular, ATR inhibition has been shown to be cytotoxic to tumor cells with an impaired DNA damage response, such as those with deficiency in the ATM- or p53 pathway. The high incidence of p53 mutations and the fact that cisplatin and radiation are key therapeutics, makes oesophageal cancer an attractive tumor type to test the activity of an ATR inhibitor. Given the reported synthetic lethal relationship between ATM and ATR, it is likely that ATR inhibition in an ATM- or p53- deficient background will offer a specific and effective way of targeting OAC and SCC of the oesophagus, and enhance the current standard of care.

The trial will be divided into three stages. Stage A1 will explore the combination of M6620 plus radiotherapy in the palliative setting and Stage A2 will explore the combination of M6620 plus chemotherapy in the palliative setting. Stage B, will explore the combination of all 3 (M6620 plus chemoradiotherapy in the radical setting).

In Stage A1 of the study M6620 will be combined with radiotherapy for the first time and the starting dose will be 140mg/m2 M6620, which has been well-tolerated. M6620 will be administered with daily palliative radiotherapy during this stage in order to study the specific interaction of M6620 with radiotherapy (acting as the DNA damaging agent during this trial stage).

In Stage A2 of the study, M6620 will be combined with Cisplatin and Capecitabine combination chemotherapy for the first time; with a starting dose of 90mg/m2 M6620. M6620 will be administered 24 hours post cisplatin infusion, aiming to achieve maximum treatment benefit. Stage A1 and A2 together will help give an indication of a toxicity profile before administration with chemoradiotherapy (Stage B).

Arms:
arm 1: The trial is a single arm study. Different populations are recruited to each stage and the stages run independently of each other. Stage A1 \& A2 will commence before Stage B so that safety data can be obtained in the palliative setting prior to Stage B commencing. Stage A1 may be ongoing when Stage B begins. Each Stage has a separate eligibility criteria.

Stage A1: M6620 \& palliative radiotherapy Stage A2: M6620 \& palliative chemotherapy (Cisplatin \& Capecitabine) Stage B: M6620 \& definitive chemoradiotherapy

Interventions: intervention 1: M6620 intervention 2: Cisplatin intervention 3: Capecitabine intervention 4: Radiotherapy
Intervention descriptions: intervention 1: M6620 is an unlicensed small molecule ATR inhibitor which can be used in combination with DNA damaging agents. In pre-clinical models it has substantial activity when given with DNA damaging drugs or ionising radiation. The clinical agent (M6620) is currently studied in a phase I trial in Oxford and other centres in combination with gemcitabine, cisplatin, gemcitabine/cisplatin and cisplatin/etoposide. intervention 2: Cisplatin is a platinum based chemotherapy drug licensed to treat a number of different types of cancer. Cisplatin use is not considered standard practice in Stage A2 \& B, therefore Cisplatin is considered an investigational medicinal product for the purpose of this trial. intervention 3: Capecitabine is a chemotherapy drug licensed to treat a number of different types of cancer, it is a noncytotoxic pre-cursor of the cytotoxic 5-fluourouracil. Capecitabine use is not considered standard practice in Stage A2 \& B, therefore Capecitabine is considered an investigational medicinal product for the purpose of this trial. intervention 4: Stage A1 uses palliative radiotherapy. Stage B uses definitive radiotherapy.

Protocol document:
Prot_000.pdf: 
Full title: A phase I dose escalation safety study combining the ATR inhibitor M6620 (Berzosertib) with 
chemoradiotherapy in oesophageal cancer & other solid cancers using time to event continual reassessment 
method 
Short title: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer 
Protocol Version & date: 
CHARIOT_Protocol_V5.0_26Oct2020
Protocol Number: 
OCTO_072
EudraCT Number: 
2015-003965-27
IRAS Project ID: 
190687 
Ethics Number: 
16/SC/0395 
Sponsor:  
University of Oxford   
Funders:  
CRUK Grant Ref: C43735/A20874
Merck KGaA, Darmstadt Germany  
Conflict of Interest statement 
None of the protocol authors have declared a potential 
conflict of interest 
Confidentiality Statement 
This document contains confidential information that must 
not be disclosed to anyone other than the Sponsor, the Trial 
Office, the Investigator Team, host NHS Trust(s), regulatory 
authorities, and members of the Research Ethics Committee 
unless authorised to do so.   


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Key trial contacts 
Chief Investigator 
Professor Maria A. Hawkins 
Medical Physics and Biomedical Engineering  
Malet Place Engineering Building  
University College London 
Gower Street 
London, WC1E 6BT
Email: m.hawkins@ucl.ac.uk
Co-Investigators 
Dr Somnath Mukherjee 
Consultant Clinical Oncologist 
Oxford University Hospitals NHS Trust 
Cancer and Haematology Centre 
Churchill Hospital 
Old Road, Oxford, OX3 7LE 
Email: somnath.mukherjee@oncology.ox.ac.uk 
Dr Simon Lord  
Consultant in Medical Oncology & Senior Clinical Researcher in 
Experimental Cancer Therapeutics 
Department of Oncology 
University of Oxford, Old Road Campus Research Building 
Off Roosevelt Drive, Oxford, OX3 7DQ 
Email: simon.lord@oncology.ox.ac.uk 
Prof Tim Maughan 
Dr Ester Hammond 
Dr Ganesh Radhakrishna  
Dr David McIntosh 
Dr. Paul Shaw 
Oncology Clinical Trial Office (OCTO) 
CHARIOT Trial 
Oncology Clinical Trials Office (OCTO) 
Department of Oncology, The University of Oxford
Old Road Campus Research Building 
Oxford OX3 7DQ, UK 
Tel: +44 (0)1865 617084 
Email: octo-chariot@oncology.ox.ac.uk
Website: http://www.oncology.ox.ac.uk/trial/chariot 
Sponsor 
University of Oxford Clinical Trials and Research Governance Team
Joint Research Office,  
1st Floor, Boundary Brook House 
Churchill Drive 
Headington 
Oxford, OX3 7GB 
Email: CTRG@admin.ox.ac.uk 
Lead NHS Trust 
R&D Department, Oxford University Hospitals NHS Trust
Second Floor, OUH Cowley 
Unipart House Business Centre 
Garsington Road 
Oxford OX4 2PG 
E-mail: ouhtma@nhs.net 


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Statistician 
Jane Holmes, Medical Statistician
Centre for Statistics in Medicine 
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal 
Sciences 
The University of Oxford 
Windmill Road 
Oxford OX3 7LD
Tel : 01865 223452 
Email: jane.holmes@csm.ox.ac.uk
AlexAlexander Ooms, Medical Statistician 
Centre for Statistics in Medicine 
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal 
Sciences 
The University of Oxford 
Windmill Road 
Oxford OX3 7L 
Tel: 01865 223453 
Email: alexalexander.ooms@csm.ox.ac.uk
Trial oversight is provided by the Radiotherapy and Imaging Oversight Committee (RIOC).
RIOC Chairman 
Prof Peter Hoskin
Clinical Queries 
During office hours: Clinical Queries should be directed to OCTO Trial Manager (details as above) for action. 
Out of office hours: Call the Churchill Hospital switchboard on Tel: 01865 741166. The switchboard team hold 
emergency contact details for the trial. 
Patient Registration: To register a patient on the trial please scan and email as a PDF attachment the registration 
form to octo-CHARIOT@oncology.ox.ac.uk
Protocol Authors and conflict of interest statement 
Eleni Frangou*3 
 
Alex Ooms*3
Claire Brooks*1 
 
Usharani Wahengbam*1
Maria Hawkins*1 
Jane Holmes*3 
Stephanie Levy *1 
Naomi McGregor*1 
*There are no relationships/conditions/circumstances that present an actual or potential conflict of interest 
1University of Oxford, Department of Oncology 
2Oxford University NHS Trust 
3University of Oxford, Centre for Statistics in Medicine 


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TABLE OF CONTENTS 
PROTOCOL SYNOPSIS ................................................................................................................................................. 9
SUMMARY SCHEDULE OF EVENTS STAGE A1 ............................................................................................................... 11
SUMMARY SCHEDULE OF EVENTS STAGE A2 ............................................................................................................... 12
SUMMARY SCHEDULE OF EVENTS STAGE B .................................................................................................................. 13
STUDY FLOW CHARTS ........................................................................................................................................................ 14
ABBREVIATIONS ....................................................................................................................................................... 16
1
INTRODUCTION ..................................................................................................................................... 16
1.1
BACKGROUND .................................................................................................................................................... 16
1.2
INVESTIGATIONAL MEDICINAL PRODUCT(S) USED IN THE STUDY ................................................................................... 18
1.3
PRE-CLINICAL RATIONALE ..................................................................................................................................... 19
1.4
CLINICAL RATIONALE............................................................................................................................................ 19
2
TRIAL DESIGN......................................................................................................................................... 20
2.1
STAGE A1 ......................................................................................................................................................... 21
2.2
STAGE A2 ......................................................................................................................................................... 21
2.3
STAGE B ........................................................................................................................................................... 22
2.4
DURATION OF PATIENT PARTICIPATION .................................................................................................................... 23
2.5
POST-TRIAL CARE AND FOLLOW-UP......................................................................................................................... 23
2.6
RECRUITMENT SCHEMATIC ................................................................................................................................... 24
3
OBJECTIVES AND ENDPOINTS ................................................................................................................ 25
3.1 STAGE A .................................................................................................................................................................... 25
3.1.1
STAGE A1 ......................................................................................................................................................... 25
3.1.2
STAGE A2 ......................................................................................................................................................... 25
3.2 STAGE B .................................................................................................................................................................... 26
4
PATIENT SELECTION ............................................................................................................................... 27
4.1
ELIGIBILITY CRITERIA ............................................................................................................................................ 27
4.2
PROTOCOL DEVIATIONS AND WAIVERS TO ENTRY CRITERIA........................................................................................... 29
4.3
RE-SCREENING IF PATIENT DOES NOT MEET INCLUSION/EXCLUSION CRITERIA FIRST TIME ROUND ......................................... 30
4.4
PATIENT REGISTRATION ........................................................................................................................................ 30
4.5
REGISTRATION PROCEDURE ................................................................................................................................... 30
5
TRIAL ASSESSMENTS AND PROCEDURES ................................................................................................ 30
5.1
INFORMED CONSENT ........................................................................................................................................... 30
5.2
CONTRACEPTION REQUIREMENT AND CONTRACEPTIVE/ PREGNANCY COUNSELLING ......................................................... 31
5.2.1
CONTRACEPTION REQUIREMENT ............................................................................................................................ 31
5.2.2
FEMALE PARTICIPANT OF CHILD-BEARING POTENTIAL .................................................................................................. 31
5.2.3
MALE PARTICIPANTS ............................................................................................................................................ 31
5.2.4
PREGNANCY COUNSELLING ................................................................................................................................... 31
5.3
PRE-DOSING EVALUATIONS (ALL STAGES) ................................................................................................................. 31
5.4
STAGE A EVALUATIONS ........................................................................................................................................ 32
5.4.1
STAGE A1 EVALUATIONS DURING THE STUDY ............................................................................................................ 32
5.4.2
STAGE A1 EVALUATIONS ON EARLY WITHDRAWAL ..................................................................................................... 33
5.4.3
STAGE A1 OFF-STUDY AND FOLLOW-UP EVALUATIONS .............................................................................................. 33
5.4.4
STAGE A2 EVALUATIONS DURING THE STUDY ............................................................................................................ 34
5.4.5
STAGE A2 EVALUATIONS ON EARLY WITHDRAWAL ..................................................................................................... 35
5.4.6
STAGE A2 OFF-STUDY AND FOLLOW-UP EVALUATIONS .............................................................................................. 35
5.5
STAGE B EVALUATIONS ........................................................................................................................................ 35
5.5.1
STAGE B EVALUATIONS DURING THE STUDY .............................................................................................................. 35
5.5.2
STAGE B EVALUATIONS ON EARLY WITHDRAWAL ....................................................................................................... 36
5.5.3
STAGE B OFF-STUDY AND FOLLOW-UP EVALUATIONS ................................................................................................ 36
6
EARLY PATIENT WITHDRAWAL .............................................................................................................. 37


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6.1
TREATMENT WITHDRAWAL .................................................................................................................................. 37
6.2
CONSENT WITHDRAWAL ...................................................................................................................................... 37
6.3
PATIENT EVALUABILITY AND REPLACEMENT .............................................................................................................. 37
7
SAMPLES FOR LABORATORY ANALYSIS .................................................................................................. 38
7.1
SAMPLES TO BE ANALYSED IN LOCAL TRUST’S LABORATORIES ....................................................................................... 38
7.2
BLOOD AND TISSUE SAMPLES FOR TRANSLATIONAL RESEARCH ...................................................................................... 38
7.2.1
BIOPSY SAMPLES ................................................................................................................................................. 38
7.2.2
RESEARCH BLOOD SAMPLES .................................................................................................................................. 38
7.3
LABELLING AND CONFIDENTIALITY OF SAMPLES SENT .................................................................................................. 38
7.4
CLINICAL REPORTING OF EXPLORATORY RESEARCH ASSAY RESULTS................................................................................. 39
7.5
TRIAL SAMPLE RETENTION AT END OF STUDY ............................................................................................................. 39
7.6
WITHDRAWAL OF CONSENT FOR SAMPLE COLLECTION AND/OR RETENTION .................................................................... 39
8
INVESTIGATIONAL MEDICINAL PRODUCTS (IMP) ................................................................................... 40
8.1
STAGE A1 TREATMENT ........................................................................................................................................ 40
8.1.1
M6620 (BERZOSERTIB) TREATMENT SCHEDULES - STAGE A1 ...................................................................................... 40
8.1.2
RADIOTHERAPY DOSE AND DURATION –STAGE A1 ..................................................................................................... 40
8.1.3
STAGE A1: DOSE ESCALATION SCHEMA .................................................................................................................. 41
8.2
STAGE A2 TREATMENT ........................................................................................................................................ 42
8.2.1
M6620 (BERZOSERTIB) TREATMENT SCHEDULE – STAGE A2 ...................................................................................... 42
8.2.2
CHEMOTHERAPY DOSE AND DURATION - STAGE A2 ................................................................................................... 42
8.2.3
STAGE A2 DOSE ESCALATION SCHEMA .................................................................................................................... 42
8.3
STAGE B TREATMENT .......................................................................................................................................... 43
8.3.1
M6620 (BERZOSERTIB) TREATMENT DOSE AND SCHEDULE – STAGE B .......................................................................... 43
8.3.2
CHEMORADIOTHERAPY DOSE AND DURATION - STAGE B ............................................................................................. 43
8.3.3
RADIOTHERAPY DOSE AND DURATION - STAGE B ....................................................................................................... 43
8.3.4
STAGE B DOSE FREQUENCY ESCALATION SCHEMA ...................................................................................................... 44
8.4
MANAGEMENT OF M6620 (BERZOSERTIB) DRUG ADMINISTRATION ............................................................................. 46
8.5
MANAGEMENT OF CAPECITABINE ADMINISTRATION ................................................................................................... 47
8.6
MANAGEMENT OF CISPLATIN ADMINISTRATION ........................................................................................................ 47
8.7
MANAGING DELAYS TO CHEMOTHERAPY AND RADIOTHERAPY ..................................................................................... 48
8.8
LABORATORY VALUES REQUIRED FOR ADMINISTRATION OF CHEMOTHERAPY ................................................................... 48
8.9
CALCULATING AND RECALCULATING DOSES .............................................................................................................. 48
8.10
CHEMOTHERAPY DOSE-BANDING ........................................................................................................................... 48
8.11
DOSE CAPPING ................................................................................................................................................... 48
8.12
COMPLIANCE ..................................................................................................................................................... 48
8.13
MANAGEMENT OF OVERDOSE ............................................................................................................................... 48
9
TOXICITY MANAGEMENT ....................................................................................................................... 49
9.1
DOSE LIMITING TOXICITY ...................................................................................................................................... 49
9.1.1
REPORTING A DLT .............................................................................................................................................. 49
9.1.2
DEFINITION OF A DLT .......................................................................................................................................... 49
9.2
MANAGEMENT OF TREATMENT TOXICITIES ............................................................................................................... 51
9.3
MANAGEMENT OF M6620 (BERZOSERTIB) DRUG TOXICITIES ...................................................................................... 51
9.3.1
ADDITIONAL GUIDANCE STAGE A2 ......................................................................................................................... 52
9.3.2
TOXICITIES ASSOCIATED WITH M6620 (BERZOSERTIB) ............................................................................................... 52
9.4
MANAGEMENT OF CHEMOTHERAPY TOXICITIES ......................................................................................................... 52
9.4.1
HAEMATOLOGICAL TOXICITY ................................................................................................................................. 52
9.4.2
NON-HAEMATOLOGICAL TOXICITY .......................................................................................................................... 53
9.4.3
ADDITIONAL CAPECITABINE TOXICITIES .................................................................................................................... 53
9.4.4
ADDITIONAL CISPLATIN TOXICITIES ......................................................................................................................... 54
10
OTHER TREATMENTS (NON-IMPS) ......................................................................................................... 55
10.1
BACKGROUND SYSTEMIC THERAPY .......................................................................................................................... 55
10.2
SUPPORT MEDICATION ......................................................................................................................................... 55
10.3
CONCOMITANT MEDICATION AND NON-DRUG THERAPIES ........................................................................................... 55
10.4
PROHIBITED THERAPIES ........................................................................................................................................ 55


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10.5
POTENTIAL DRUG INTERACTIONS ........................................................................................................................... 55
10.5.1
M6620 (BERZOSERTIB) ....................................................................................................................................... 55
10.5.2
CAPECITABINE AND CISPLATIN ............................................................................................................................... 56
11
DRUG MANAGEMENT ............................................................................................................................ 56
11.1
DRUG SUPPLIES .................................................................................................................................................. 57
11.1.1
M6620 (BERZOSERTIB) ....................................................................................................................................... 57
11.1.2
CAPECITABINE AND CISPLATIN ............................................................................................................................... 57
11.2
DRUG ORDERING ................................................................................................................................................ 57
11.3
IMP RECEIPT ..................................................................................................................................................... 57
11.4
HANDLING AND STORAGE ..................................................................................................................................... 57
11.4.1
M6620 (BERZOSERTIB) ....................................................................................................................................... 57
11.4.2
CAPECITABINE AND CISPLATIN ............................................................................................................................... 57
11.5
LABELLING ......................................................................................................................................................... 57
11.5.1
M6620 (BERZOSERTIB) ....................................................................................................................................... 57
11.5.2
CAPECITABINE AND CISPLATIN: .............................................................................................................................. 57
11.6
DOSING AND DISPENSING ..................................................................................................................................... 58
11.6.1
M6620 (BERZOSERTIB) ....................................................................................................................................... 58
11.6.2
CISPLATIN AND CAPECITABINE ............................................................................................................................... 58
11.7
DRUG ACCOUNTABILITY........................................................................................................................................ 58
11.8
DRUG DESTRUCTION ............................................................................................................................................ 58
11.9
OCCUPATIONAL SAFETY ........................................................................................................................................ 58
12
RADIOTHERAPY (OR CHEMORADIOTHERAPY)........................................................................................ 58
12.1
DOSE PRESCRIPTION AND FRACTIONATION ............................................................................................................... 58
12.2
RADIOTHERAPY LOCALISATION ............................................................................................................................... 59
12.3
TARGET VOLUME DEFINITION (TVD) ....................................................................................................................... 59
12.4
ORGANS AT RISK ................................................................................................................................................. 61
12.5
TREATMENT PLAN OPTIMISATION .......................................................................................................................... 61
12.6
DOSE CONSTRAINTS ............................................................................................................................................ 61
12.7
TREATMENT DELIVERY AND VERIFICATION ................................................................................................................ 62
12.8
MANAGEMENT OF RADIOTHERAPY TOXICITY ............................................................................................................. 62
12.9
THE MANAGEMENT OF UNSCHEDULED GAPS IN RADIOTHERAPY TREATMENT ................................................................... 63
12.10
RADIOTHERAPY QUALITY ASSURANCE ...................................................................................................................... 64
13
EVALUATION OF RESPONSE ................................................................................................................... 64
13.1
TUMOUR ASSESSMENT ......................................................................................................................................... 64
13.2
TUMOUR RESPONSE ............................................................................................................................................ 64
13.3
OTHER DEFINITIONS OF OUTCOME: ........................................................................................................................ 64
14
SAFETY REPORTING ............................................................................................................................... 64
14.1
ADVERSE EVENT DEFINITIONS ............................................................................................................................... 65
14.2
CLINICAL LABORATORY ABNORMALITIES AND OTHER ABNORMAL ASSESSMENTS AS AES AND SAES ...................................... 65
14.3
DETERMINING ADVERSE EVENT CAUSALITY ............................................................................................................... 66
14.4
REFERENCE SAFETY INFORMATION (RSI) FOR ASSESSMENT OF EXPECTEDNESS ................................................................. 66
14.4.1
EXPECTED ADVERSE EVENTS ASSOCIATED WITH RADIOTHERAPY .................................................................................... 67
14.5
SUMMARY OF TRIAL SAFETY REPORTING REQUIREMENTS ............................................................................................. 67
14.6
SUSPECTED UNEXPECTED SERIOUS ADVERSE DRUG REACTIONS (SUSARS) .................................................................... 69
14.7
EXPEDITED REPORTING OF SAES ............................................................................................................................ 69
14.8
FOLLOW-UP OF SERIOUS ADVERSE EVENTS .............................................................................................................. 69
14.9
REPORTING ADVERSE EVENTS ON THE CRF .............................................................................................................. 70
14.10
EVENTS EXEMPT FROM BEING REPORTED AS AE/ SAES............................................................................................... 70
14.11
INFORMING INVESTIGATORS OF NEW SAFETY INFORMATION ........................................................................................ 70
15
PREGNANCY ........................................................................................................................................... 70
16
DEFINING THE END OF TRIAL ................................................................................................................. 71
17
STATISTICAL CONSIDERATIONS .............................................................................................................. 71


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17.1
SAMPLE SIZE AND POWER ..................................................................................................................................... 71
18
STATISTICAL ANALYSIS PLAN ................................................................................................................. 71
18.1
INCLUSION IN ANALYSIS ........................................................................................................................................ 71
18.2
SUBGROUP ANALYSIS ........................................................................................................................................... 72
18.3
INTERIM ANALYSES ............................................................................................................................................. 72
18.4
PROCEDURES FOR REPORTING ANY DEVIATION(S) FROM THE PROTOCOL ......................................................................... 72
18.5
ANALYSIS FOR SAFETY .......................................................................................................................................... 72
18.6
FINAL ANALYSIS .................................................................................................................................................. 72
19
TRIAL COMMITTEES ............................................................................................................................... 72
19.1
TRIAL MANAGEMENT GROUP (TMG) .................................................................................................................... 72
19.2
SAFETY REVIEW COMMITTEE ................................................................................................................................ 72
19.3
TRIAL STEERING COMMITTEE ................................................................................................................................ 72
20
DATA MANAGEMENT ............................................................................................................................ 73
20.1
DATABASE CONSIDERATIONS ................................................................................................................................. 73
20.2
CASE REPORTS FORMS (CRFS) ............................................................................................................................... 73
20.3
ACCOUNTING FOR MISSING, UNUSED, OR SPURIOUS DATA. .......................................................................................... 73
20.4
CLINICAL STUDY REPORT ....................................................................................................................................... 73
21
STUDY SITE MANAGEMENT ................................................................................................................... 73
21.1
STUDY SITE RESPONSIBILITIES ................................................................................................................................ 73
21.2
STUDY SITE PROTOCOL DEVIATIONS ........................................................................................................................ 74
21.3
STUDY SITE SET UP AND ACTIVATION ....................................................................................................................... 74
21.4
ARRANGEMENTS FOR SITES OUTSIDE THE UK ............................................................................................................ 74
21.5
STUDY DOCUMENTATION ..................................................................................................................................... 74
22
REGULATORY AND ETHICAL CONSIDERATIONS ...................................................................................... 74
22.1
ETHICAL CONDUCT OF THE TRIAL AND ETHICS APPROVAL ............................................................................................. 74
22.2
REGULATORY AUTHORITY APPROVAL ...................................................................................................................... 74
22.3
NHS RESEARCH GOVERNANCE .............................................................................................................................. 74
22.4
PROTOCOL AMENDMENTS .................................................................................................................................... 74
22.5
URGENT SAFETY MEASURES .................................................................................................................................. 75
22.6
TEMPORARY HALT ............................................................................................................................................... 75
22.7
SERIOUS BREACHES ............................................................................................................................................. 75
22.8
TRIAL REPORTS .................................................................................................................................................. 75
23
EXPENSES AND BENEFITS ....................................................................................................................... 76
24
QUALITY ASSURANCE ............................................................................................................................ 76
24.1
RISK ASSESSMENT ............................................................................................................................................... 76
24.2
MONITORING .................................................................................................................................................... 76
24.3
AUDIT AND REGULATORY INSPECTION ..................................................................................................................... 76
25
RECORDS RETENTION & ARCHIVING ...................................................................................................... 76
26
PATIENT CONFIDENTIALITY .................................................................................................................... 77
27
STUDY FUNDING .................................................................................................................................... 77
28
SPONSORSHIP AND INDEMNITY ............................................................................................................ 77
28.1
SPONSORSHIP .................................................................................................................................................... 77
28.2
INDEMNITY ........................................................................................................................................................ 77
28.3
CONTRACTS/AGREEMENTS ................................................................................................................................... 77
29
PUBLICATION POLICY ............................................................................................................................. 77
30
REFERENCES ........................................................................................................................................... 78
31
APPENDIX A: ECOG PERFORMANCE SCALE ............................................................................................. 79


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APPENDIX B: MEASUREMENT OF DISEASE - RECIST CRITERIA ................................................................ 79
33
APPENDIX C: RTOG LATE TOXICITY SCORE ............................................................................................. 83
34
APPENDIX D: MELLOW DYSPHAGIA SCORE ............................................................................................ 83
35
APPENDIX E: PROTOCOL AMENDMENT HISTORY ................................................................................... 84


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PROTOCOL SYNOPSIS 
Full Title of study: 
A phase I dose escalation safety study combining the ATR inhibitor M6620 (Berzosertib) 
with chemoradiotherapy in oesophageal cancer & other solid cancers using time to 
event continual reassessment method 
Short Title: 
M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer 
Trial Acronym: 
CHARIOT 
Clinical Phase: 
Phase I 
Study Design: 
Interventional 
Stage A1 
Objectives 
Endpoints/ Outcome Measures 
Primary: 
To determine the best tolerated M6620 
(Berzosertib) treatment schedule (or 
phase II recommended dose (RPTD)) 
administered concomitantly with 
radiotherapy (RT) only in the palliative 
treatment of oesophageal cancer 
Highest treatment schedule resulting in 
less than 25% dose limiting toxicity (DLT) 
rate (see section 9.1.2 for DLT definitions) 
Secondary: 

To determine the safety and toxicity 
profile of M6620 (Berzosertib) 
administered concomitantly with RT 
only in the palliative treatment of 
oesophageal cancer 

To determine if M6620 (Berzosertib) 
can be delivered in combination with 
palliative RT  

Efficacy of the combination 

Any toxicity grade ≥3 graded 
according to CTCAE v4.03 and length 
of time for toxicity to resolve 

Proportion of patients completing at 
least 75%, 90% and 100% of the 
planned RT dose 

Objective tumour response (OR) as 
evaluated by CT scan and quantified 
by Response Criteria Evaluation 
(RECIST 1.1) & PFS and OS from D1 

In field radiotherapy control 
Tertiary:

Explore tumour characteristics 
associated with response

Genotyping of tumours
Stage A2 
Objectives 
Endpoints/ Outcome Measures 
Primary: 
To determine the best tolerated M6620 
(Berzosertib) treatment schedule (or 
phase II recommended dose (RPTD)) 
administered concomitantly with 
chemotherapy (Cisplatin and 
Capecitabine) only in the palliative 
treatment of solid cancer 
Highest treatment schedule resulting in 
less than 30% dose limiting toxicity (DLT) 
rate (see section 9.1.2 for DLT definitions) 
Secondary: 

To determine the safety and toxicity 
profile of M6620 (Berzosertib) 
administered concomitantly with 
chemotherapy (Cisplatin and 
Capecitabine) only in the palliative 
treatment of solid cancer 

To determine if M6620 (Berzosertib) 
can be delivered in combination with 
palliative chemotherapy 

Efficacy of the combination 

Any toxicity grade ≥3 graded 
according to CTCAE v4.03 and length 
of time for toxicity to resolve 

Proportion of patients completing at 
least 75%, 90% and 100% of the 
planned dose 

Objective tumour response (OR) as 
evaluated by CT scan and quantified 
by Response Criteria Evaluation 
(RECIST 1.1) & PFS and OS from D1 
Stage B 
Objectives 
Endpoints/ Outcome Measures 
Primary: 
To determine the best tolerated M6620 
(Berzosertib) treatment schedule (or 
phase II recommended dose (RPTD)) 
administered concomitantly with 
radiotherapy (dCRT) in combination with 
Highest treatment schedule resulting in 
less than 45% dose limiting toxicity (DLT) 
rate (see section 9.1.2 for DLT definitions) 


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Protocol Template V5.0_28Nov2014 
cisplatin and capecitabine in the radical 
treatment of oesophageal cancer 
Secondary: 

To determine the safety and toxicity 
profile of M6620 (Berzosertib) 
administered concomitantly with 
dCRT in combination with cisplatin 
and capecitabine in the radical 
treatment of oesophageal cancer 

To determine tolerance and ability to 
deliver M6620 (Berzosertib) in 
combination with standard dCRT  

Efficacy and safety of the combination 

Any toxicity grade ≥3 graded 
according to CTCAE v4.03 and length 
of time for toxicity to resolve 

Treatment tolerance and deliverability 
measured by proportion of patients 
completing at least 80% of the 
planned chemotherapy dose and at 
least 20 fractions of RT 

Objective tumour response (OR) as 
evaluated by CT scan and quantified 
by Response Criteria Evaluation 
(RECIST 1.1) and endoscopic and 
biopsy findings & PFS and OS from D1 
Tertiary 
To explore target effects in tissue 

Change in level of ATR inhibition and 
apoptosis in M6620 (Berzosertib) 
treated tissue using IHC. 

Genotyping of tumours 

Aim to identify markers for 
oesophageal cancer in the blood
Planned enrolment: 
Stage A1: Maximum 20 participants 
Stage A2: Maximum 20 participants 
Stage B: Maximum 25 participants 
Target Population: 
Stage A1: Oesophageal tumours for palliative radiotherapy 
Stage A2: Metastatic or advanced inoperable solid tumours for chemotherapy 
Stage B: Oesophageal tumours for radical chemoradiotherapy 
Name of drug 
Formulation, dose, route of 
administration 
Investigational 
Medicinal Product(s) 
M6620 (Berzosertib) 
Solution for infusion, 90 – 240 mg/m2
Cisplatin 
Solution for infusion, 60 mg/m2
Capecitabine 
Tablet, 625mg/m2 bd, oral 
Other interventions: 
Stage A1: Palliative radiotherapy 
Stage B: Definitive radiotherapy 
Treatment Duration 
Stage A1: 3 weeks 
Stage A2: maximum 18 weeks 
Stage B: 11 weeks 
Follow-up duration (last 
study visit from start of 
treatment) 
Stage A1: 12 weeks 
Stage A2: maximum 26 weeks 
Stage B: 24 weeks 
Participants will be followed up through their medical records at 6 and 12 months for 
Stage A1 & A2 
End of study 
For the purpose of the Research Ethics Committee approval the trial end date will be the 
Last Patient start of treatment for Stage B plus 24 weeks.


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SUMMARY SCHEDULE OF EVENTS STAGE A1
Week 1
Week 2
Week 3
Week 49
Week 9
Week 12
Study Day 
Screening
Post 
Registration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Follow up8
M
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Informed Consent 
X
Screening assessments1
X 
M6620 (Berzosertib) schedule 
assignment 
 
X 
Radiotherapy planning 
X 
Radiotherapy (35GY in 15#) 
 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
M6620 (Berzosertib)
X
X2
X
X2
X
X3
Haematology/Biochemistry4
X 
 
X 
X2
 
X 
 
 
X2
X 
X3
X
Coagulation 
X 
 
X 
 
X 
 
DLT assessment5
X 
 
X 
 
 
X2
X 
X3
 
X 
X 
 
AE assessment5
X 
X 
 
X 
 
 
X2
X 
X3
 
X 
X 
X 
Concurrent medications5
X 
 
X 
X 
 
X 
 
 
X2
X 
X3
 
X 
X 
X 
Physical exam5
X 
 
X 
X 
 
X 
 
 
X2
X 
X3
 
X 
X 
X 
Weight5
X 
 
X 
 
X 
 
X 
 
X 
X 
X 
ECOG performance status 
X 
 
X 
X2 
 
X 
 
 
X2
X 
X3
 
X 
X 
X 
ECG6
X 
 
X 
 
X 
 
X 
Vital signs 
X 
 
X7
CT chest abdomen pelvis 
X8
 
X10
Collection of archival biopsy
 
X11
1 Screening assessments including: pregnancy test (to be repeated for WOCBP 4 weekly during treatment), height and medical history, see section 5.3 
2 Dose schedules -2, -1, 2, 3, 5 & 6 only  
3 Dose schedules -1, 3 & 6 only 
4 Screening and within 24 hours prior to dosing with M6620 (Berzosertib): Haemoglobin, ANC, lymphocytes, WBC, Platelets, Bilirubin, ALP, AST or ALT, urea, Serum creatinine, eGFR, K+, Na+
5 +/- 24 hours, must be prior to dosing with M6620 (Berzosertib); day 4 all patients (excluding weight day 4) 
6 ECG to be carried out at screening, baseline (pre-M6620 (Berzosertib)) week 4 and week 12 and if clinically indicated on treatment 
7 Per clinical requirement 
8 Screening CT only needs to be done if diagnostic CT carried out > 42 days prior to start of treatment  
9 Week 4 follow-up should be 1 week after last dose/fraction (+7 days) 
10 CT Scan can be done up to 7 days prior to the Week 12 visit 
11 Optional 


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Protocol Template V5.0_28Nov2014 
SUMMARY SCHEDULE OF EVENTS STAGE A2 
Cycle 1* 
Cycle 2 
Cycle 3 
Cycle 4 
Cycles 5-610
Follow up11
Screening
Post 
Registration
Week 1
Week 2
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
Week 9
Week 10
Week 11
Week 12
2 weeks
post EOT
8 weeks 
post EOT
Informed Consent 
X 
Repeat assessments 
done for cycles 3-4  in 
cycles 5-6 (if 
applicable) 
Screening assessments1
X 
M6620 (Berzosertib) schedule assignment 
X 
Capecitabine2
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
Cisplatin3
X3
 X3
 X3
 X3
M6620 (Berzosertib)4
X4 
X4 
X4 
X4 
X4 
X4 
X4 
X4 
X4 
X4 
X4 
X4
Haematology/Biochemistry5
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
Coagulation 
X 
X 
X 
ECOG performance status6 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
Physical Exam6
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
Weight6
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
Vital signs 
X 
X8
ECG7
X 
X 
X 
X 
X 
Audiogram monitoring13 
X 
X 
Concurrent medications6
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
DLT Assessment6
X 
X 
X 
X 
AE Assessment6
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
CT chest abdomen pelvis9
X 
X 
X 
X 
1Screening assessments including: pregnancy test (to be repeated for WOCBP 4 weekly during treatment), height and medical history, see section 5.3 
2 Capecitabine taken bd weeks 1 to 18 
3 Cisplatin given on day 1 (Mon) 
4 M6620 (Berzosertib) given on day 2 only (Tues) dose schedules 1 & 3; M6620 (Berzosertib) given on day 2 & day 5 (Tues/Fri) dose schedules 2 & 4
5 Check Haem/Biochem within 72 hours prior to cisplatin and 24 hours preceding M6620 (Berzosertib) (only one sample needs to be taken if it satisfies both Cisplatin and M6620 
(Berzosertib) requirements): Hb, ANC, lymphocytes, WBC, Platelets, Bilirubin, ALP, AST or ALT, Serum creatinine, Urea, K+, Na+, eGFR, Ca, Mg, Phosphate 
M6620 (Berzosertib)M6620 (Berzosertib)6 Assessment done within 24 hours prior to M6620 (Berzosertib) dosing (weight once weekly) 
7ECG to be carried out at screening, pre-treatment and once per cycle 
8 Per clinical requirement 
9 CT chest abdomen pelvis in weeks 6, 12, 18 and at 8 weeks post EOT. Screening CT only needs to be done if staging CT was carried out > 35 days prior to start of treatment. 
10 Patients can continue with treatment after 4 cycles if CT shows no progression and at the discretion of the PI. 
11 Two week follow-up should be 2 weeks after last dose (+/-7 days); 8 week follow-up should be 8 weeks after last dose (+/- 2 weeks)
12 If required.                                                                                       *Each cycle lasts 3 weeks 


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SUMMARY SCHEDULE OF EVENTS STAGE B 
Cycle 1* 
Cycle 2 
Cycle 3 
Cycle 4 
Follow up 
Screening
Baseline
Week 1
Week 2
Week 3
Week 4
Week 5
Week 6
Week 7 
Week 8 
Week 9 
Week 10 
Week  11 
Week 
1213
Week 18
Week 24
1
2
3
4
5
8
9
10
11
12
15
16
17
18
19
22
23
24
25
26
29
30
31
32
33
M 
T 
W
Th 
F 
M
T 
W 
Th 
F 
M 
T 
W
Th 
F 
M 
T 
W
Th 
F 
M 
T 
W
Th 
F 
 
Informed Consent 
X 
 
Screening assessments1
X 
 
M6620 (Berzosertib) schedule 
assignment 
 
 
 
X 
Radiotherapy planning 
X 
IMRT (50GY in 25#) 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
 
Capecitabine2
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
 
Cisplatin (Day 1) 
D1 
 
D1 
 
 
X 
X 
 
 
 
M6620 (Berzosertib) (Day 2) 
D2 
 
D2 
 
 
X4
X5 
 
X 
 
 
X6
X 
X8 
 
X 
 
 
X5
X 
X7
Haematology/Biochemistry3
X 
 
X 
 
X 
 
X 
X5
 
X 
 
 
X6
X 
X8
X 
 
 
X5
X 
X7
 
X 
X 
 
Coagulation 
X 
 
X 
 
X 
 
 
ECOG performance status 
X 
 
X 
X 
 
X 
X 
 
X 
X5
 
X 
 
 
X6
X 
X8
X 
 
 
X5
X 
X7
 
X 
X 
X 
Physical Exam9
X 
 
X 
X 
 
X 
X 
 
X 
X5
 
X 
 
 
X6
X 
X8
X 
 
 
X5
X 
X7
 
X 
X 
X 
Weight9
X 
 
X 
 
X 
 
 
X 
 
X 
 
 
 
X 
X 
 
 
 
X 
 
X 
X 
X 
Vital signs9
X 
 
X 
X 
 
X 
X 
 
X 
X5
 
X 
 
 
X6
X 
X8
X 
 
 
X5
X 
X7
 
X 
X 
X 
ECG10
X 
 
X 
 
X 
 
 
X 
X 
 
 
 
 
X 
Audiogram monitoring14 
 
X 
 
X 
 
 
Concurrent medications9
X 
 
X 
X 
 
X 
X 
 
X 
X5
 
X 
 
 
X6
X 
X8
X 
 
 
X5
X 
X7
 
X 
X 
X 
DLT Assessment9
X 
 
X 
X 
 
X 
X5
 
X 
 
 
X6
X 
X8
X 
 
 
X5
X 
X7
 
X 
X 
X 
AE Assessment9
X 
X 
 
X 
X 
 
X 
X5
 
X 
 
 
X6
X 
X8
X 
 
 
X5
X 
X7
 
X 
X 
X 
Mellow Score9
X 
X 
 
X 
X 
 
X 
X5
 
X 
 
 
X6
X 
X8
X 
 
 
X5
X 
X7
 
X 
X 
X 
Research blood sample 
 
X 
X11 
X 
 
 
Research biopsy 
X11
 
X 
CT 
X12
X 
1Screening assessments including: pregnancy test (to be repeated for WOCBP 4 weekly during treatment), height, medical history, Echo/MUGA and Lung function test, see section 5.3 
2 Capecitabine taken bd weeks 1 to 6; capecitabine taken bd Mon to Fri weeks 7 to 11 
3 Check Haem/Biochem within 72 hours prior to cisplatin and 24 hours preceding M6620 (Berzosertib) (only one sample needs to be taken if it satisfies both Cisplatin and M6620 (Berzosertib) requirements): Hb, ANC, 
lymphocytes, WBC, Platelets, Bilirubin, ALP, AST or ALT, Serum creatinine, Urea, K+, Na+, eGFR, Ca, Mg, Phosphate 
4 Except schedule 1 
5 M6620 (Berzosertib) schedules 3, 4, 5 & 6 only 
6 M6620 (Berzosertib) schedules 4, 5 & 6 only 
7 M6620 (Berzosertib) schedules 5 & 6 only 8 M6620 (Berzosertib) schedule 6 only 
9Assessment done within 24 hours prior to M6620 (Berzosertib) dosing; and in weeks 2 & 5 of induction chemotherapy on day 1 or day 2 (excluding weight weeks 2 & 5) 
10 ECG in cycle 1 to be carried out pre-treatment 
11 On treatment biopsy/blood sample should be done from radiotherapy fraction 3 to fraction 5 (but up to fraction 7 is permitted if required) 
12 Screening CT only needs to be done if diagnostic CT carried out > 42 days prior to start of treatment 
13 Week 12 follow up to be done one week after last dose/fraction (+7 days)
14If required. 
*Each cycle lasts 3 weeks 


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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Study Flow Charts  
Stage A1 
Stage A2 
1
2 
3
 4 
9 
12 
Screening + RT 
planning 
Duration of daily RT + 
intermittent M6620 
(Berzosertib) 
Follow  
up visit 
End of study visit 
Clinical review and assessment of toxicity before each M6620 (Berzosertib) administration, 
and at follow up 
1 
6 
20 
26 
Screening 
3 weekly cycles of chemotherapy1 + 
intermittent M6620 (Berzosertib) (once or twice 
Follow up visit 
End of study visit 
Clinical review and assessment of toxicity before each M6620 (Berzosertib) administration, and 
at follow up
Week
2
3
4
5
7
8
9     10    11   12   13   14   15   16    17   18
Cisplatin IV infusion 
1 Daily Capecitabine; Cisplatin on day 1 of 21 day cycle 
Follow  
up visit 
Week


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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Stage B 
1 
18 
24 
Screening 
Induction Chemotherapy1                           Chemoradiotherapy2
M6620 (Berzosertib) dosing3
Follow up 
visit 
Follow up 
visit 
End of study 
visit 
Cisplatin IV infusion 
Clinical review and assessment of toxicity pre M6620 (Berzosertib) 
administration,  
Research endoscopy                 Research Blood Sample 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11
12
Week
M6620 (Berzosertib) schedule assignment 
Treatment 
1 Daily Capecitabine; Cisplatin on day 1 of 21 day cycle 
2 Capecitabine (Mon to Fri) and RT (Mon to Fri) for 5 weeks; Cisplatin continues on day 1 
   of 21 day cycle 
3 On day 2 of 21 day cycle during induction chemotherapy. Assignment of intermittent  
  schedule in week 6 and commencement of intermittent schedule in week 7 


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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ABBREVIATIONS 
4DCT 
4D computed tomography 
4DCECT 
4D contrast enhanced computed tomography 
ACA 
Adenocarcinoma 
AE 
Adverse Event 
BOI 
Beginning of infusion 
CR 
Complete Response 
CRT 
Chemoradiotherapy 
D 
Day 
dCRT 
Definitive Chemoradiotherapy 
DLT 
Dose Limiting Toxicity 
EOI 
End of infusion 
FDG-PET 
Fluorodeoxyglucose Positron Emission Tomography 
GTV 
Gross Tumour Volume 
IB 
Investigator Brochure 
ICRU 62 
International Commission on Radiation Units Report 62 
IHC 
Immunohistochemistry 
IMP 
Investigational Medicinal Product 
IMRT 
Intensity-Modulated Radiation Therapy 
mOS 
Mean Overall Survival 
MA 
Marketing Authorisation 
MTD 
Maximum Tolerated Dose 
OAC 
Oesophageal Adenocarcinoma 
OS 
Overall Survival 
PI 
Principal Investigator 
RSI 
Reference Safety Information  
RT 
Radiotherapy 
RTTQA 
Radiotherapy Trials Quality Assurance 
SAR 
Serious Adverse Reaction 
SCC 
Squamous Cell Carcinoma 
SmPC 
Summary of Product Characteristics 
LPLV 
last visit of the last patient undergoing the trial 
SUSAR 
Suspected Unexpected Serious Adverse Drug Reaction 
TiTE-CRM
Time to Event Continual Reassessment Method
1
INTRODUCTION 
1.1
Background  
Oesophageal cancer has been identified by CRUK as a cancer of unmet need, because of persistent low 5-year 
survival (13%) and lack of research in this disease. The incidence of oesophageal cancer has risen in recent 
decades, coinciding with a shift in histology and primary tumour location (www.cancerresearchuk.org/cancer-
info/cancerstats/types/oesophagus/). In 2010, 8500 people were diagnosed with oesophageal cancer in the UK 
and in 2011 there were 7600 deaths, making it the 4th most common cause of death in males.  In the UK it 
accounts for around 5% of all cancer deaths (Cancer Research UK, n.d.). Surgery has been the cornerstone of 
curative treatment of oesophageal adenocarcinoma (OAC) but is only appropriate for 10-20% of the patient 
population as at presentation the majority of patients are unsuitable for surgery and have locally advanced or 
metastatic disease irrespective of histologic type. Surgery for squamous cell carcinoma (SCC) is used less often; 
the proximal nature of the disease making reconstructive surgery more challenging and patients often being less 
fit as a result of co-existing cardio-pulmonary disease due to the common aetiology of the diseases. 


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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Radical Setting 
Definitive chemo-radiotherapy (dCRT) is usually offered to those patients who have non-metastatic oesophageal 
cancer who are unsuitable for surgery but this modality has been increasingly considered a standard of care for 
patients with operable SCC [15]. The recently reported SCOPE 1 trial, a CRUK-funded trial which investigated the 
addition of Cetuximab to standard cisplatin/fluoropyrimidine based dCRT [12], reported unprecedented good 
outcomes in the standard dCRT arm with a mOS of 25.4 mo and 2-yr OS of 56%. This study demonstrated that 
with a detailed protocol and a robust radiotherapy trials quality assurance (RTTQA) programme, high quality 
dCRT can be delivered throughout the UK and lead to outcomes equivalent to that seen in published surgical 
series. The dCRT outcome was comparable to surgical outcomes despite the patient population in this trial 
having a relatively poor prognosis.  Unfortunately, other chemotherapy regimens have not shown an improved 
survival over the Cisplatin Fluorouracil combination. There was no increase in median PFS after Oxaliplatin and 
Fluorouracil (FOLFOX) dCRT when compared with Cisplatin Fluorouracil dCRT 9.7 months (95% CI 8.1–14.5) vs 
9.4 months (8.1–10.6)  or median OS  20.2 months (95% CI 14.7–25.6),vs 17.5 months (13.9–19.4) respectively[2] 
highlighting the need for better treatment in this patient group. 
A recent study in oesophageal cancer reported patterns of failure after dCRT, assessed by FDG-PET scan in 239 
patients [3]. With a median follow-up of 52.6 months, 119 patients (50%) had relapsed locally, 90% of which 
were within the Gross Tumour Volume (GTV). Having a failure within the GTV (as opposed to all other failure 
patterns plus patients without failure) influenced OS as well; the median OS time for patients with GTV failure 
was 23.3 months (95% CI, 20.00-31.32) versus 31.6 months for those with no GTV failure (95% CI, 24.31-not 
reached; p< .0009). A similar study by Button et al reviewed the patterns of relapse in 145 patients treated with 
dCRT [4]. Of the 85 (60%) patients who had evidence of relapse after a median on 18 months, 55 had relapse 
within the irradiated field, 13 relapsed with metastatic disease and 14 had a combination of local and distant 
disease. Another study assessed patterns of relapse in 274 patients treated in non-randomised trials by TROG 
between 1985 and 1999[5]. Local failure was observed in 42.3% and distant failure in isolation occurred in 18.1%. 
In the subgroup with least favourable survival, adenocarcinoma of the lower third of the oesophagus local failure 
rate (51.5%) dominated over distant failure (36.1%). Taken together, these studies suggest that both local and 
systemic failures are competing risk factors, and integrating a new agent with the standard dCRT schedule is 
most likely to succeed if this can enhance the activity of both cisplatin (systemic component) and radiotherapy 
(local component). 
In SCOPE 1[1] patients who were failure free at 24 weeks (76% in the standard arm) had significantly better 
median overall survival than did those who were not failure free (26.7 mo [24.5–42.7]vs. 8.3 mo [95% CI 6.7–
12.5] respectively. The RTOG 0436 study evaluated whether the addition of cetuximab to paclitaxel, cisplatin 
and RT improved overall survival in patients with oesophageal cancer who are treated without surgery [6]. The 
study (comparable to SCOPE1) failed to show that adding cetuximab improved survival. However, clinical 
assessments with endoscopy at 6-8 weeks after completion of therapy were undertaken in all evaluable patients 
and an analysis of responders (CR versus non CR) were predictive of survival HR=2.2(1.59-2.83) [6]. 
Palliative setting 
dCRT treatment is toxic with a death rate of 2% due to significant life threatening toxicity. Cisplatin is 
nephrotoxic, and fluoropyrimidines can precipitate acute coronary syndrome therefore CRT is only offered to 
good performance status (PS) patients with adequate renal function and no significant ischaemic heart disease. 
Patients unsuitable for CRT may be treated with radiotherapy alone as a non-invasive means of palliating 
dysphagia and comprise around half of patients referred for RT based treatment.  
TROG 03.01, a multinational phase III study in advanced oesophageal cancer (7) comparing palliation of 
dysphagia and quality of life in patients treated with radiotherapy or chemoradiotherapy (CMT) randomised 220 
patients to receive a course of palliative RT [35 Gy in 15 fractions, (n=115) or 30 Gy in 10 fractions (n=105)], or 
concomitant CRT with Cisplatin and 5FU (D1-4) (n=111). The primary endpoint was the proportion of patients 
with improved dysphagia measured at week 9 and maintained until week 13. RT alone showed a dysphagia 
response (at any point) of 68% similar to CMT 74%, (p=0.343). The primary endpoint of dysphagia improvement 
was achieved in 41% with RT and 47% with CMT (p=0.4163). There was increased toxicity in patients receiving 
CMT, (nausea (p=0.0019) and vomiting (p=0.0072)). Median survival was 210 days for CRT, 203 days for RT. 
Although the results of the trial showed equally poor survival in both arms, there were some patients (n=21, 


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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10%) still alive at 2 years post treatment indicating that this is a group of patients who should not be denied 
active cancer treatment. 
Summary of design 
This phase I study will test the combination of a novel ATR inhibitor (M6620 (Berzosertib)) with 
chemoradiotherapy in oesophageal cancer. In the first two cohorts (Stage A1 and A2), we will investigate the 
safety of combining M6620 (Berzosertib) separately with [1] palliative radiotherapy (RT) for oesophageal cancer 
(Stage A1) and [2] with cisplatin/capecitabine chemotherapy in patients with advanced inoperable and 
metastatic solid tumours (Stage A2). In Stage A1, M6620 (Berzosertib) will be given in combination with high 
dose palliative RT treatment, aiming to deliver M6620 (Berzosertib) twice weekly during RT escalating to a dose 
of 240mg/m2. A palliative chemotherapy cohort (Stage A2) will open to recruitment simultaneously where 
M6620 (Berzosertib) will be given in combination with cisplatin/capecitabine chemotherapy, aiming to deliver 
M6620 (Berzosertib) twice weekly escalating to a dose of 140mg/m2 twice weekly.  When  adequate toxicity and 
follow-up  information to suggest the combinations are tolerable has accumulated, the ATR inhibitor will be 
tested in the definitive setting (Stage B) in combination with cisplatin/capecitabine and radical RT to identify the 
Maximum Tolerated Dose (MTD). The MTD found in this study will be taken forward in future phase II studies. 
In the palliative setting, we aim to find the schedule associated with no more than 25% Dose Limiting Toxicities 
(DLTs) in stage A1 on the basis that palliative oesophageal radiotherapy causes approximately 20% grade 3 and 
4 toxicity and 30% Dose Limiting Toxicities (DLTs) in stage A2 are derived from capecitabine/cisplatin used in the 
radical setting (SCOPE1 study [12]). 
In the radical setting, we aim to find the schedule associated with no more than 45% DLTs on the basis that 
conventional oesophageal chemoradiation causes a grade 3 and 4 toxic event rate of 28% haematological 
toxicity and 63% non-haematological toxicity of which 34% is gastrointestinal as reported in the standard arm 
of SCOPE1 study (12). Comparable toxicity rates were described in the standard arm of the 
PRODIGE5/ACCORD17 study (13): grade 3 and 4 neutropenia 29% and grade 3 and 4 dysphagia and oesophagitis 
33%. 
The trial will find the best optimal dose and dosing schedule using the TiTE-CRM (Time To Event Continual 
Reassessment Method). The CRM is a model based method for finding the MTD. It assumes that toxicity 
increases monotonically with increasing dose, and that efficacy also increases with increasing dose. The aim will 
be to find the dose that causes a DLT with the above specified target toxicity levels. TiTE-CRM is a modified CRM 
that accounts for the time to event of late onset toxicities. The advantages of a TiTE-CRM are that all current 
critical toxicity summaries are used when deciding which dose to give the next patient and it is not necessary for 
a patient to complete the full observation period before consenting the next patient. This results in a better 
estimation of the MTD and shorter study duration respectively.  
1.2
Investigational Medicinal Product(s) used in the study  
M6620 (Berzosertib) 
M6620 (Berzosertib) is an unlicensed small molecule ATR inhibitor which can be used in combination with DNA 
damaging agents. In pre-clinical models it has substantial activity when given with DNA damaging drugs or 
ionising radiation. The clinical agent (M6620 (Berzosertib)) is currently studied in a phase I trial in Oxford and 
other centres in combination with gemcitabine, cisplatin, gemcitabine/cisplatin and cisplatin/etoposide (see 
section 1.4) 
Cisplatin 
Cisplatin is a platinum based chemotherapy drug licensed to treat a number of different types of cancer (see 
SmPC for more details). 
Capecitabine 
Capecitabine is a chemotherapy drug licensed to treat a number of different types of cancer, it is a non-cytotoxic 
pre-cursor of the cytotoxic 5-fluourouracil (see SmPC for more details). 


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1.3
Pre-clinical rationale 
DNA damaging agents (e.g. cisplatin and RT) are key treatments for many solid tumours including oesophageal 
cancer. Tumours can be resistant to current DNA-damaging based therapies due to the existence of an effective 
DNA Damage Response (DDR). The DDR consists of a series of molecular events that allow repair of damaged 
DNA and promote cell survival. ATM (Ataxia Telangiectasia Mutated) and ATR (ATM-and Rad3-related), members 
of phosphoinositol3-kinase like kinase family (PIKKs), are key components of the DDR. During normal DNA 
replication, ATR is recruited to stalled replication forks (replication stress) that can progress to DNA double 
strand breaks if unprotected.  The recruitment and activation of ATR leads to cell cycle arrest in S phase whilst 
DNA is repaired; otherwise nuclear fragmentation occurs and apoptosis is initiated. Therefore, blocking ATR in 
an environment where replication stress is elevated as a result of treatment with radiotherapy or chemotherapy 
should improve killing of cancer cells. Consistently, it has been demonstrated that radiation and Cisplatin are 
more efficacious in tumour cells where kinase dead ATR has been expressed (1, 2).  
M6620 (Berzosertib) is a potent inhibitor of ATR (inhibition constant [Ki] <300 pM) that blocks ATR activity in 
cells, with a concentration resulting in 50% maximal inhibition (IC50) of 20 nM. ATR inhibition enhances the 
cytotoxic effect of DNA damaging drugs and IR in many cancer cell lines and primary human tumors. In contrast, 
normal cells tolerate ATR inhibition since they can activate compensatory DDR signaling via the ATM pathway. 
In xenograft models, M6620 (Berzosertib) markedly enhances the anticancer activity of numerous DNA 
damaging drugs and IR, often substantially delaying or completely halting tumor progression and promoting 
tumor regression. Dose range finding studies in mice (with gemcitabine and cisplatin) showed that maximal 
activity was observed when M6620 (Berzosertib) was administered intravenously at a dose of 20 mg/kg/week, 
given as a single dose or as two 10-mg/kg doses 3 days apart. Dose-responsive biomarker effects, which correlate 
with efficacy, support ATR inhibition as the primary mechanism of action.1
Consistent with the compensatory role the ATM/p53 pathway plays in response to ATR inhibition in normal cells, 
defects in this pathway result in increased cell sensitivity to ATR inhibition. In isogenic cell studies it has been 
shown that loss of ATM itself or one of its principle substrates, p53, can markedly increase cell sensitivity to ATR 
inhibition. Similarly, in a large panel of 119 genetically-diverse cancer cell lines, TP53 mutational status was 
shown to correlate with response to ATR inhibition in combination with DNA damaging agents.  
Pires et al (10) showed that VE-821 also inhibited ATR-mediated signalling in response to the replication arrest 
induced by severe hypoxia and that ATR inhibition consistently sensitised tumour cell lines to radiation across a 
range of oxygen tensions. In addition, it was shown for the first time that treatment with the ATR inhibitor led 
to a decrease in HIF-1-mediated signalling, suggesting that it could also inhibit the biological consequences of 
tumour hypoxia such as increased invasion, metastasis and angiogenesis.  
Fokas et al (11) demonstrated radio-sensitisation and chemosensitisation to gemcitabine using the ATR inhibitor 
VE-822 in p53 and KRAS mutant pancreatic ductal adenocarcinoma (PDAC) in vitro and in vivo (VE-822 is another 
pre-clinical ATR inhibitor chemically identical to M6620 (Berzosertib)). The selectivity of VE-822 was initially 
demonstrated through selective reduction in CHK1 phosphorylation without inhibition of ATM or DNA-PK 
signalling pathways. In xenograft experiments, the activity was profound, to the extent that the combination of 
RT with VE-822 prevented MiaPaCa-2 tumour regrowth in some mice. Importantly, VE-822 did not increase 
normal cell radiosensitivity and chemosensitivity in vitro, similar to the VE-821 studies described previously.  
ATR inhibition has not been previously tested specifically on oesophageal cancer cell lines or xenografts. We 
have recently demonstrated chemosensitisation (cisplatin) and radiosensitisation of ACA and SCC cell lines using 
VE-822. These data show that the addition of the ATR inhibitor (VE-822) increases sensitivity to radiation as well 
as cisplatin in 3 oesophageal cell lines (OE21, FLO-1 and OE33) both under normoxic and hypoxic conditions 
(<0.1% O2) (Hammond, unpublished data).  
1.4
Clinical rationale 
There is strong scientific rationale for combining ATR inhibitors with DNA damaging agents such as radiation and 
cisplatin. In particular, ATR inhibition has been shown to be cytotoxic to tumour cells with an impaired DNA 
damage response (DDR), such as those with deficiency in the ATM- or p53 pathway [7]. The high incidence of 
p53 mutations (~89.9% in SCC of the oesophagus and ~72% in ACA) [8, 9] and the fact that cisplatin and radiation 
are key therapeutics, makes oesophageal cancer an attractive tumour type to test the activity of an ATR inhibitor 
[8-10]. Given the reported synthetic lethal relationship between ATM and ATR, it is likely that ATR inhibition in 


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an ATM- or p53- deficient background will offer a specific and effective way of targeting OAC and SCC of the 
oesophagus, and enhance the current standard of care.    
The in vitro and in vivo studies mentioned above, have shown that M6620 (Berzosertib) can enhance sensitivity 
of cancer cells to chemotherapy and radiotherapy without enhancing radiosensitivity in normal tissue [7, 11]. 
This tumour selectivity suggests there will be little or no enhancement of radiation toxicity and therefore, is 
likely to allow delivery of full doses of chemotherapy and radiotherapy. In contrast, recently reported studies in 
gastro-oesophageal cancer, toxicity due to addition of novel agents resulted in reduction of dose intensity of 
standard treatment and inferior survival in the experimental arms[1, 12] underlining the importance of this lack 
of toxicity in normal tissues. 
In an ongoing study (VX12-970-001), M6620 (Berzosertib) is being dosed in combination gemcitabine and in 
combination with cisplatin to determine the MTD of M6620 (Berzosertib) in combination with these agents. To 
date, 140 mg/m2 of M6620 (Berzosertib) in combination with 75 mg/m2 of cisplatin was tolerated. Also, 210 
mg/m2 of M6620 (Berzosertib) in combination with 1000 mg/m2 of gemcitabine was tolerated and is the 
recommended phase II dose. In another ongoing study (VX13-970-002), M6620 (Berzosertib) at 90 mg/m2 in 
combination with AUC 5 of carboplatin was tolerated. Also, evaluation of on-target tumor biopsies at these 
doses demonstrated target engagement as measured by ATR-mediated phosphorylation of Chk1 (P-Chk1). 
The trial will be divided into 2 stages, stage A and Stage B.  Stage A will consist of 2 parts, part A1 will explore 
the combination of M6620 (Berzosertib) plus radiotherapy and Stage A2 will explore the combination of M6620 
(Berzosertib) plus chemotherapy in the palliative setting. Stage B, will explore the combination of all 3, M6620 
(Berzosertib) plus chemoradiotherapy in the radical setting. In Stage A1 of the study M6620 (Berzosertib) will be 
combined with radiotherapy for the first time and the starting dose will be 140mg/m2 M6620 (Berzosertib), 
which has been well-tolerated. Intravenous (IV) administration was shown to be better tolerated than oral 
administration in dogs and will be used in the study. We have chosen to administer M6620 (Berzosertib) with 
daily palliative radiotherapy in Stage A1 to study specific interaction of M6620 (Berzosertib) with radiotherapy 
which is the DNA damaging agent at this stage. In Stage A2 of the study M6620 (Berzosertib) will be combined 
with Cisplatin and Capecitabine combination chemotherapy for the first time and the starting dose will be 
90mg/m2 M6620 (Berzosertib).  We have chosen to administer M6620 (Berzosertib) after chemotherapy to 
explore possible additional interactions with cisplatin which binds with DNA to form intrastrand crosslinks and 
adducts that cause changes in the conformation of the DNA and affects DNA replication fluoropyrimidines whose 
primary mechanism of action is the inhibition of thymidylate synthase. Stage A1 and A2 will give an indication 
of toxicity profile before administration with radiotherapy, Capecitabine and Cisplatin during 
chemoradiotherapy.  Data from the VERTEX study VX12-970-001 indicates maximum benefit from the 
chemotherapy and M6620 (Berzosertib) treatment combination comes with administration of M6620 
(Berzosertib) between 14 and 36 hours post administration of DNA damaging agent (VERTEX, unpublished 
results). Therefore we propose to administer M6620 (Berzosertib) 24 hours post cisplatin infusion.  
2
TRIAL DESIGN 
This will be a single arm, open-label, phase I dose escalation trial using the Time-To-Event Continual 
Reassessment Method (TiTE-CRM) to find the optimal treatment schedule. The TiTE-CRM method  uses critical 
toxicity  summaries of accumulated patient data from all participants treated with at least one dose of the IMP 
within the corresponding trial stage and for whom up-to-date data has been provided (trial unit will endeavour 
to ensure contemporaneous data is received for all participants) and it is not necessary for a patient to 
complete the full observation period before consenting the next patient. This results in a better estimation of 
the MTD and shorter study duration respectively and is particularly useful in trials involving radiotherapy 
where the toxicity follow-up phase is longer. 
The trial design ensures no treatment schedule skipping and the treatment schedule assigned will be that 
estimated to be closest to but not above the MTD. However, if the lowest schedule is estimated to be above the 
MTD we will keep assigning the lowest schedule until we are certain it is too toxic, at which point the trial may 
start again using a lower dose of drug. When escalating, the treatment schedule cannot skip an untried dose but 
there will be no restriction on treatment schedule de-escalation. Each escalation decision will be made by the 
TMG based on the recommendation from the TiTE-CRM model and the accumulated experience of the 


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recommended schedule. If the TMG is unable to reach a decision or a stopping rule has been met the Safety 
Review Committee (SRC) will meet. 
The trial consists of three stages A1, A2 and B which are described in the following sections. Stages A1 and A2 
will run concurrently and will inform the starting dose of M6620 (Berzosertib) for Stage B. 
2.1
Stage A1 
The aim is to find the M6620 (Berzosertib) treatment schedule when combined with radiotherapy that is 
associated with no more than 25% dose limiting toxicity rate on the basis that palliative oesophageal 
radiotherapy is associated with approximately 15-20% grade 3/4 toxicity. Six treatment schedules are proposed.  
Each schedule comprises a specific combination of dose and dosing frequency. There are two possible M6620 
(Berzosertib) doses and three dosing frequencies (see section 8.1). The radiation dose remains consistent across 
all treatment schedules.  
The treatment involves 3 weeks of daily radiotherapy and M6620 (Berzosertib) at a pre-determined frequency 
dependent on the treatment schedule allocated to the individual patient. The follow-up of a further 6 weeks 
provides a DLT observation window of a total of 9 weeks. An initial cohort of three patients will receive the 
starting schedule (lowest dosing frequency) at the starting dose, 140mg/m2. The fourth patient will not be 
recruited until all three patients have been followed for the minimum of 9 weeks from the start of radiotherapy 
or the occurrence of a DLT. 
Subsequently, all eligible patients will be continuously recruited and the TiTE-CRM will be used to assign their 
treatment schedule. To ensure enough information is accumulated to inform the assignment of the treatment 
schedule to the subsequent patient, recruitment will be managed through allocation of treatment slots (see 
section 4.4 for further details). 
2.1.1. Stage A1 stopping rules 
Stage A1 will pause for safety if, at any point in the trial, there is sufficient evidence to suggest that schedule 1 
is too toxic. More specifically, we will consider schedule 1 to be too toxic if, given all the available data, there is 
a high probability that the DLT rate is greater than the target toxicity level of 0.25. If all 3 patients in the first 
cohort have DLTs then schedule 1 is too toxic and the trial will be re-started. At this point, three extra schedules 
will be introduced at 90mg/m2 and varying dosing frequencies, namely (schedule -3, -2 and -1). Once the trial is 
restarted, the lowest schedule, schedule -3, will be explored first. There will then be 9 treatment schedules to 
explore (the original 6 plus the 3 dosing frequencies at the lower dose). If the first 3 patients recruited to 
schedule -3 experience DLTs then the trial will stop. If schedule 1 is found to be too toxic later in the trial when 
more than 3 patients have been recruited, a SRC meeting will be convened to decide whether the trial should 
be restarted using the lower dose of 90mg/m2. 
Stage A1 will stop for success when either a total of 10 patients have been assigned to a particular treatment 
schedule or 20 patients have been recruited, whichever occurs first. When 10 patients in Stage A1 have been 
assigned to a particular treatment schedule, recruitment will be paused until there are no more than three 
patients without full follow-up (either DLT or 6 weeks after the end of treatment), i.e. until there is full follow-
up information on at least seven patients. If the MTD changes, recruitment may start again. 
Based on simulations and assuming a patient will be recruited every 8 weeks, the average number of patients 
required for Stage A1 is 18, which we aim to recruit in 24 months.  
2.2
Stage A2  
The aim is to find the M6620 (Berzosertib) treatment schedule when combined with palliative combination 
chemotherapy (Cisplatin and Capecitabine) that is associated with no more than a 30% dose limiting toxicity 
rate. Four treatment schedules are proposed. Each schedule comprises a specific combination of dose and 
dosing frequency. There are two possible M6620 (Berzosertib) doses and two dosing frequencies (see section 
8.2). Chemotherapy dose remains consistent across all treatment schedules.  


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The treatment involves six cycles of chemotherapy with three weekly Cisplatin and Capecitabine and M6620 
(Berzosertib) at a pre-determined frequency dependent on the treatment schedule allocated to the individual 
patient. The follow-up of a further 8 weeks provides a total observation window of 26 weeks. DLT assessments 
will be carried out during the first 4 weeks of treatment. The MTD will be determined during this period using 
the TiTE-CRM. An initial cohort of three patients will receive the starting schedule (lowest dosing frequency) at 
the starting dose. The fourth patient will not be recruited until all three patients have been followed for a 
minimum of 4 weeks from the start of chemotherapy or until the occurrence of a DLT. 
From the fourth patient, all eligible patients will be continuously recruited and the TiTE-CRM will be used to 
assign their treatment schedule. To ensure enough information is accumulated to inform the assignment of the 
treatment schedule to the subsequent patient, recruitment will be managed by allocating treatment slots (see 
section 4.4 for further details). 
2.2.1. Stage A2 stopping rules 
Stage A2 will stop for safety if, at any point in the trial, there is sufficient evidence to suggest that schedule 1 is 
too toxic. More specifically, we will consider schedule 1 to be too toxic if, given all the available data, there is a 
high probability that the DLT rate is greater than the target toxicity level of 0.3. If the first three patients recruited 
to Stage A2 have DLTs at treatment schedule 1, then the starting schedule (treatment schedule 1) will be deemed 
too toxic and the trial will stop. 
The trial will stop for success when either six patients have been assigned to the fourth treatment schedule (140 
mg/m2 of M6620 (Berzosertib) twice weekly) or 20 patients in total have been recruited, whichever occurs first. 
When six patients in Stage A2 have been assigned to the fourth treatment schedule, recruitment to Stage A2 
will be paused until there is full DLT follow-up information on at least five patients. If the MTD has changed, 
recruitment to Stage A2 may start again.  
Based on simulations and assuming a patient will be recruited every 3 weeks, the average number of patients 
required for Stage A2 is 16, which we aim to recruit in 12 months.  
2.3
Stage B 
The aim is to find the M6620 (Berzosertib) treatment schedule when combined with chemoradiotherapy that is 
associated with no more than 45% dose limiting toxicity rate on the basis that conventional oesophageal 
chemoradiation causes a grade 3 and 4 toxic event rate of 28% haematological toxicity and 63% non-
haematological toxicity, of which 34% is gastrointestinal, as reported in the standard arm of the SCOPE1 study.  
Comparable toxicity rates were described in the standard arm of the PRODIGE5/ACCORD17 study: grade 3 and 
4 neutropenia 29% and grade 3 and 4 dysphagia and oesophagitis 33% (13). A maximum of 25 patients will be 
recruited to Stage B. 
There are three proposed M6620 (Berzosertib) treatment schedules (same dose but increasing dosing 
frequencies) to be explored during Stage B. Before each patient enters Stage B, a TMG will be held to confirm 
recruitment. If permitted to enrol in the study, the patient will also be assigned a provisional treatment schedule 
based on the TiTE-CRM’s recommendation. If necessary, a confirmation meeting for the M6620 (Berzosertib) 
treatment schedule assignment will occur prior to the start of chemoradiotherapy 6 weeks after a patient is 
recruited. This will maximise the accumulation of information on each patient before deciding on the treatment 
schedule for the subsequent patient.  
The dose of M6620 (Berzosertib) in Stage B will be 140mg/m2, allocation will start on schedule 1, which is the 
middle of the 3 schedules. Recruitment will be continuous; however, escalation will not occur until at least one 
patient full DLT window of 24 weeks is complete. At this point escalation to schedule 2 will be possible if it is 
estimated to be safe, and dose decisions thereafter will be made once each new patient is recruited and 
confirmed (if there is reason to think their allocation may have changed) when they have been treated for 6 
weeks (the induction period which is the same for all schedules). De-escalation to schedule -1 is possible at any 
point in the trial. Although recruitment will be continuous, the TMG retain the option to pause recruitment 
should they decide more follow-up data is needed before continuing. This may be, for example, to prevent too 
many patients being treated with a sub-optimal, or too toxic, schedule. No more than 7 patients will be treated 
on schedule 1 before there is full follow-up data on at least one patient. 


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We will recommend starting stage B: 
-
If 10 patients have been recruited to A1 and it has not restarted at the lower dose  
-
If 10 patients have been assigned to at least schedule 3 in A2 (i.e. are on any of the schedules with a 
dose of 140mg/m2) or the stopping rule is satisfied (6 treated on schedule 4) 
If one of the above starting rules are satisfied then an SRC meeting will be convened to review the data and may 
recommend starting stage B. 
2.3.1 Stage B stopping rules 
Stage B will stop for safety if, at any point in the trial, there is sufficient evidence to suggest that schedule -1 is 
too toxic. More specifically, we will consider schedule -1 to be too toxic if, given all the available data, there is 
a high probability that the DLT rate is greater than the target toxicity level of 0.45. There will be no early 
stopping rules for success. We expect to recruit a minimum of 15 patients. 
2.4
Duration of patient participation 
Stage A1: Participants will be in the study for 12 weeks from first trial dose or intervention to last protocol 
visit. 
Stage A2: Participants will be in the study for maximum of 26 weeks from first trial dose to last protocol visit.
Stage B: Participants will be in the study for 24 weeks from first trial dose or intervention to last protocol visit.
2.5
Post-trial care and follow-up 
Following the end of study visit, patients will receive standard care. They may receive further chemotherapy if 
appropriate as per the standard practice of the clinical care team.  Patients in Stage A1 & A2 will be followed 
for progression free survival, overall survival and late toxicity via routine medical oncology follow up clinics.  
The physician will be asked to provide these data at 6 and 12 months from the start of treatment for Stage A1 
and Stage A2. 


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2.6
Recruitment Schematic
Stage A recruited patients. 
Stage A1 
Stage A2 
Stage B 
Recruitment 
paused for at 
least 4 weeks 
from start of 
treatment of the 
3rd patient
3 patients are recruited and assigned to  

Stage A1: Schedule 1  

Stage A2: Schedule 1 
1 patient is recruited and assigned to  

*Stage B: Schedule 1
Patients are followed up for  
Stage A1 – 12 weeks 
Stage A2 – 26 weeks 
Stage B – 24 weeks
Recruitment 
paused for at 
least 9 weeks 
from start of 
treatment of the 
3rd patient. If all 
three patients 
have toxicities, 
Stage A1 will be 
re-started at a 
lower dose.
Recruitment 
continuous but 
no escalation 
until full 24 week 
DLT window 
completed by 1 
participant. Max 
of  7 recruited in 
the 1st patient’s 
DLT.
Recruitment is paused while enough 
information is acquired for these. 
No dose 
skipping for 
dose escalation 
No restrictions 
for dose de-
escalation 
Check stopping and safety rules 
Stopping  
rule met:  
call SRC 
meeting
Stop  
Trial 
Stopping  
rule 
not met
Once a patient is ready to be recruited, if they are eligible 
for dose escalation, run the TiTE-CRM model based on  
the accumulated critical toxicity data from all participants 
treated with at least one dose of the IMP within the 
corresponding trial stage. 
The TMG reviews the output of the TiTE-
CRM model and decides on patient’s 
treatment plan assignment. If TMG 
cannot reach a decision, SRC will review 
the decision 
*Stage B will start once:  
A1: 10 patients have been recruited to 
A1 and it has not restarted at the lower 
dose or 20 patients have been recruited. 
OR 
A2: 10 patients have been assigned to at 
least treatment schedule 3 or 6 on 
schedule 4 or the maximum of 20 
patients have been recruited.  
There are no early success stopping rules 
for Stage B. The maximum number of 
participants that can be recruited is 25 
patients. 
Stage B MTD will be estimated at the end 
of follow up. 


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3
OBJECTIVES AND ENDPOINTS 
3.1 Stage A 
3.1.1
Stage A1 
3.1.2
Stage A2 
Primary Objective 
Endpoints/ Outcome Measures 
Time point(s) for 
evaluation of end 
point  

To determine the best tolerated 
M6620 (Berzosertib) treatment 
schedule (or phase II recommended 
dose (RPTD)) administered 
concomitantly with chemotherapy 
(Cisplatin and Capecitabine) only in 
the palliative treatment of solid 
cancer 

Highest treatment schedule 
resulting in less than 30% dose 
limiting toxicity (DLT) rate (see 
section 9.1.2 for DLT definitions)

Week 4 
Secondary Objectives 
Endpoints/ Outcome Measures 

To determine the safety and toxicity 
profile of M6620 (Berzosertib) 
administered concomitantly with 

Any toxicity grade ≥3 graded 
according to CTCAE v4.03 and 

During 
chemotherapy  
Week 1-18 
Primary Objective 
Endpoints/ Outcome Measures 
Time point(s) for 
evaluation of end 
point  

To determine the best tolerated 
M6620 (Berzosertib) treatment 
schedule (or phase II recommended 
dose (RPTD)) administered 
concomitantly with Radiotherapy 
only in the palliative treatment of 
oesophageal cancer 
Highest treatment schedule resulting in 
less than 25% dose limiting toxicity (DLT) 
rate (see section 9.1.2 for DLT 
definitions)

Week 9 
Secondary Objectives 
Endpoints/ Outcome Measures 

To determine the safety and toxicity 
profile of M6620 (Berzosertib) 
administered concomitantly with RT 
only in the palliative treatment of 
oesophageal cancer 

Any toxicity grade ≥3 graded 
according to CTCAE v4.03 and length 
of time for toxicity to resolve 

During 
radiotherapy 
Weeks 1-3 

Week 4, 9 and 
week 12 

To determine if M6620 
(Berzosertib) can be delivered in 
combination with palliative RT  

Proportion of patients completing at 
least 75%, 90% and 100% of the 
planned RT dose 

End of 
radiotherapy  
End of Week 3 

Efficacy of the combination 

Objective tumour response (OR) as 
evaluated by CT scan and quantified 
by Response Criteria Evaluation 
(RECIST 1.1) 

PFS and OS from D1 

In field radiotherapy control 

12 weeks 

6 and 12 months 
Tertiary Objectives 
Endpoints/ Outcome Measures 

Explore tumour characteristics 
associated with response 

Genotyping of tumours 

Pre-trial archival 
biopsy 


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chemotherapy (Cisplatin and 
Capecitabine) only in the palliative 
treatment of solid cancer 
length of time for toxicity to 
resolve 

Week 20, 26 

To determine if M6620 (Berzosertib) 
can be delivered in combination with 
palliative chemotherapy 

Proportion of patients completing 
at least 75%, 90% and 100% of the 
planned dose 

End of 
chemotherapy 
Week 18 

Efficacy of the combination 

Objective tumour response (OR) as 
evaluated by CT scan and 
quantified by Response Criteria 
Evaluation (RECIST 1.1)  

PFS and OS from D1 

Week 6, 12, 18, 
26 

Week 26 & 12 
months 
3.2 Stage B 
Primary Objective 
Endpoints/ Outcome measures 
Time point(s) for 
evaluation of end 
point  

To determine the best tolerated 
M6620 (Berzosertib) treatment 
schedule (or phase II recommended 
dose (RPTD)) administered 
concomitantly with radiotherapy 
(dCRT) in combination with cisplatin 
and capecitabine in the radical 
treatment of oesophageal cancer 
Highest treatment schedule resulting in 
less than 45% dose limiting toxicity 
(DLT) rate (see section 9.1.2 for DLT 
definitions)

Up to Week 24 
Secondary Objectives 
Endpoints/ Outcome Measures 

To determine the safety and toxicity 
profile of M6620 (Berzosertib) 
administered concomitantly with 
dCRT in combination with cisplatin 
and capecitabine in the radical 
treatment of oesophageal cancer 

Any toxicity grade ≥3 graded 
according to CTCAE v4.03 and length 
of time for toxicity to resolve 

Up to week 24 

To determine tolerance and ability 
to deliver M6620 (Berzosertib) in 
combination with standard dCRT  

Treatment tolerance and 
deliverability measured by 
proportion of patients completing 
at least 80% of the planned 
chemotherapy dose and at least 20 
fractions of RT 

End of induction 
chemotherapy 
and dCRT. End of 
week 11 

Efficacy and safety of the 
combination

Objective tumour response (OR) as 
evaluated by CT scan and quantified 
by Response Criteria Evaluation 
(RECIST 1.1) and endoscopic and 
biopsy findings.

PFS and OS from D1

24 weeks 
Tertiary/Exploratory Objectives 
Endpoints/ Outcome Measures 


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4
PATIENT SELECTION 
Written informed consent must be obtained before any study specific procedures are performed. The 
Investigator will determine patient eligibility based on the following criteria.  
4.1
Eligibility criteria  
Inclusion criteria:  
A patient will be eligible for inclusion in this study if all of the following criteria apply.  
Stage A1 
1.
Histologically confirmed adenocarcinoma or squamous cell carcinoma of the oesophagus (not 
including cervical oesophagus). 
2.
Tumour length 15 cm or less. 
3.
Any stage of disease that is unsuitable for radical CRT or surgery but suitable for palliative RT.  
4.
Baseline investigations available: staging CT scan (within 42 days before first study dose) and 
endoscopy. 
5.
Previous chemotherapy treatment completed 28 days before first study dose. 
6.
No oesophageal stent in situ. 
7.
Any gender, age  16 years. 
8.
Life expectancy of at least 12 weeks. 
9.
ECOG performance score of 0-1. 
10. Able to comply with protocol fully - absence of any physical, psychological, familial, sociological or 
geographical condition potentially hampering compliance with the study protocol and follow-up 
schedule; those conditions should be discussed with the patient before registration in the trial. 
11. Able to give written (signed and dated) informed consent according to GCP before registration.  
12. Haematological and biochemical indices within the ranges shown below: 
Lab Test 
Value required 
Haemoglobin (Hb) 
≥ 8.0 g/dL 
Platelet count 
≥ 100 x 10^9/L 
Absolute neutrophil count (ANC)
≥ 1.5 x 10^9/L  
Total bilirubin 
≤ 1.5 x upper limit of normal unless the subject has known or 
suspected Gilbert’s syndrome 
AST (SGOT)/ALT (SGPT) 
≤ 2.5 x upper limit of normal; ≤5 X ULN if liver metastases  
Estimated glomerular filtration rate 
≥40mL/min  
Stage A2 
1.
Any histologically confirmed advanced solid tumour that is metastatic or unresectable where 
investigator considers Cisplatin and Capecitabine based regimen as appropriate.  
2.
Baseline investigations available: staging CT scan (within 35 days before first study dose). 
3.
Previous chemotherapy treatment completed 28 days before first study dose. 
4.
Any gender, age  16 years. 
5.
Life expectancy of at least 12 weeks. 
6.
ECOG performance score of 0-1.  

To explore target effects in tissue 

Change in level of ATR inhibition 
and apoptosis in M6620 
(Berzosertib) treated tissue using 
IHC. 

Genotyping of tumours 

Aim to identify markers for 
oesophageal cancer in the blood 

Biopsies at 
baseline, week 7 
and 24

Blood samples at 
baseline, week 7 
and week 12 


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7.
Able to comply with protocol fully - absence of any physical, psychological, familial, sociological or 
geographical condition potentially hampering compliance with the study protocol and follow-up 
schedule; those conditions should be discussed with the patient before registration in the trial. 
8.
Able to give written (signed and dated) informed consent according to GCP before registration.  
9.
Haematological and biochemical indices within the ranges shown below: 
Lab Test 
Value required 
Haemoglobin (Hb) 
≥ 10.0 g/dL 
Platelet count 
≥ 100 x 10^9/L 
Absolute neutrophil count (ANC)
≥ 1.5 x 10^9/L  
Total bilirubin 
≤ 1.5 x upper limit of normal unless the subject has 
known or suspected Gilbert’s syndrome 
AST (SGOT)/ALT (SGPT) 
≤ 2.5 x upper limit of normal  or ≤5 x ULN in presence of 
liver metastases 
Ca, Mg, Phosphate 
Normal limits  
Estimated glomerular filtration rate 
≥60mL/min  
Stage B 
1.
Histologically confirmed adenocarcinoma or squamous cell carcinoma of the oesophagus including 
Siewert type 1 or 2 tumours with ≤2cm gastric mucosal extension (not including cervical oesophagus). 
2.
Tumour length 7cm or less. 
3.
Suitable for radical CRT and surgery not an option due to being medically unfit or unsuitable for 
surgery or patient choice. 
4.
No oesophageal stent in situ. 
5.
Endoscopically or radiologically documented measureable disease. 
6.
Diagnostic PET CT scan* 
7.
Staging CT scan*  
*either CT or PET CT within 42 days of first study dose 
8.
Adequate respiratory and cardiac function tests for safe delivery of CRT in the opinion of the Principal 
Investigator, specifically cardiac ejection fraction ≥60% and lung function FEV1 >1 litre or 40% of 
predicted value or KCO (DLCO/VA) > 40% predicted value. 
9.
Any gender, age  16 years. 
10. ECOG performance score of 0-1. 
11. Able to comply with protocol fully - absence of any physical, psychological, familial, sociological or 
geographical condition potentially hampering compliance with the study protocol and follow-up 
schedule; those conditions should be discussed with the patient before registration in the trial. 
12. Able to give written (signed and dated) informed consent according to GCP before registration. 
13. Haematological and biochemical indices within the ranges shown below: 
Lab Test 
Value required 
Haemoglobin (Hb) 
≥ 10.0 g/dL 
Platelet count 
≥ 100 x 10^9/L 
Absolute neutrophil count (ANC)
≥ 1.5 x 10^9/L  
Total bilirubin 
≤ 1.5 x upper limit of normal unless the subject has 
known or suspected Gilbert’s syndrome  
AST (SGOT)/ALT (SGPT)  
≤ 2.5 x upper limit of normal  
Ca (corrected), Mg, Phosphate 
Normal limits  
Estimated glomerular filtration rate 
≥60mL/min  


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Exclusion criteria: 
A patient will not be eligible for the trial if any of the following apply: 
1.
Pregnant or breast-feeding women or women of childbearing potential unless highly effective 
methods of contraception are used. (see Section 5.2) 
2.
Untreated and multiple brain metastases. 
3.
Clinically significant cardiovascular event within 6 months before study entry to include: 
a.
congestive heart failure requiring therapy 
b.
unstable angina pectoris 
c.
myocardial infarction 
d.
Class II/III/IV cardiac disease (New York Heart Association) 
e.
presence of severe valvular heart disease; 
f.
presence of a ventricular arrhythmia requiring treatment 
4.
History of arrhythmia that is symptomatic or requires treatment (CTCAE 3), symptomatic or 
uncontrolled atrial fibrillation, despite treatment, or asymptomatic sustained ventricular 
tachycardia. Subjects with atrial fibrillation controlled by medication are permitted. 
5.
Uncontrolled hypertension (blood pressure ≥160/100 despite optimal therapy). 
6.
Second or third degree heart block with or without symptoms. 
7.
QTc >450 msec in adult male and >470 msec in adult females (by Fridericia’s correction) not 
due to electrolyte abnormality and that does not resolve with correction of electrolytes. 
8.
History of congenital long QT syndrome. 
9.
History of torsades de pointes (or any concurrent medication with a known risk of inducing 
torsades de pointes). 
10. Trachea-oesophageal fistula or invasion of the tracheo-bronchial tree. 
11. Treatment with any other investigational agent, or  treatment in another clinical trial within 28 days 
prior to treatment start. 
12. Strong CYP3A inhibitors and inducers or Haemopoetic growth factors within 14 days before first dose 
M6620 (Berzosertib). 
13. HER2 gastro-oesophageal positive cancer where anti-Her2 therapies may be more appropriate 
(however patients who have failed anti-HER2 therapy may be eligible for stage A1 and A2). 
14. Unable to have or unwilling to change to low molecular weight heparin instead of Warfarin. 
15. Other psychological, social or medical condition, physical examination finding or a laboratory 
abnormality that the Investigator considers would make the patient a poor trial candidate or could 
interfere with protocol compliance or the interpretation of trial results. 
16. Any other active malignancy, with the exception of adequately treated cone-biopsied in situ 
carcinoma of the cervix uteri and non-melanoma skin lesions. 
17. Patients who are known to be serologically positive for active infection with Hepatitis B, Hepatitis C or 
HIV. 
Additional exclusion criteria Stage A1 and B
1.
Previous radiotherapy to thorax or upper abdomen. 
Additional exclusion criteria Stage A2 and B 
1.
History of hand-foot syndrome.
2.
History of hearing impairment.
3.
Live vaccine received within 30 days prior to treatment start. 
4.
Complete or Partial DPD deficiency. 
Additional exclusion criteria Stage B
1.
Previous chemotherapy. 
4.2
Protocol deviations and waivers to entry criteria 
Protocol adherence is a fundamental part of the conduct of a clinical study.  Changes to the approved protocol 
need prior approval unless for urgent safety measures. 


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Investigators must contact OCTO to obtain guidance and/or clarification as necessary if unsure whether the 
patient satisfies all the entry criteria and to clarify matters of clinical discretion.  OCTO will contact the Chief 
Investigator or clinical coordinators as necessary. Investigators should not request a protocol waiver to enter a 
patient who does not satisfy the selection criteria.  
4.3
Re-screening if patient does not meet inclusion/exclusion criteria first time round 
Patients may be re-screened once, for example if a slot is not available.  
4.4
Patient registration  
Participants will be recruited from patients usually referred from the upper gastrointestinal MDT. 
A screening log must be kept of all patients considered for the study including any that are subsequently 
excluded; the reason for exclusion must be recorded on this form. A copy of the screening log should be sent to 
the Trial Office on request, but without patient identifiers. The original must be retained on site. 
Before entering a patient onto the study the Principal Investigator or designee will confirm eligibility. If in any 
doubt the Chief Investigator must be consulted before entering the patient. Details of the query and outcome 
of the decision should be documented. 
Patient recruitment will be managed by the allocation of slots and there will be a minimum of 4 weeks between 
start of treatment for consecutive patients in stage A1 and a minimum of 3 weeks in stage A2. However, the 
TMG may decide to release a slot sooner if there is sufficient accumulated experience of the current schedule. 
If the TMG release a slot sooner, the patient can start treatment before the 3 & 4 week minimum treatment 
gap. In Stage B, recruitment will be managed by the allocation of slots but a pause between the treatment of 
consecutive patients is not required. 
4.5
Registration procedure 
The site should contact OCTO to check the availability of a screening slot and if available reserve the slot prior 
to giving out a Participant Information Sheet. A screening number should be requested prior to screening the 
patient and the site should register the participant within 2 weeks of receiving the screening number or 
relinquish the slot unless an extension is agreed with the trial office. 
Site staff will complete the trial registration form and email the form with an anonymised copy of the 
histopathology report to the Trial Office to confirm the patient’s eligibility. A copy of the histology report is 
required for verification of eligibility (which will identify the patient by screening number only). The original copy 
of the registration form should be stored in the site file and a copy in the patient notes. 
M6620 (Berzosertib) dose and schedule assignment will be determined by the TMG before the participant is 
registered on the trial database. The site (including Principal Investigator, Research Nurse and Trial Pharmacist) 
will be informed of the dose and treatment schedule by email once a patient is registered by the Trial Office. 
5
TRIAL ASSESSMENTS AND PROCEDURES 
5.1
Informed consent 
Potential participants will be given a current, approved version of the Patient Information Sheet and Consent 
Form. They will also receive clear verbal information about the study detailing no less than: the nature of the 
study; the implications and constraints of the protocol; the known side effects and any risks involved in taking 
part.  It will be explained that they will be free to withdraw from the study at any time, for any reason, without 
prejudice to future care, and with no obligation to give a reason for withdrawal. They will have at least 24 hours 
to consider the information provided and the opportunity to question the Investigator, their GP or other 
independent parties before deciding whether to participate. 
The Investigator who obtains consent must be suitably qualified and experienced. All delegates must be 
authorised by the Principal Investigator to obtain consent.  The Investigator is responsible for ensuring that the 
trial consent procedures comply with current applicable GCP Regulatory and ethical requirements. Informed 
consent discussions and outcomes must be well documented in the medical record. The Investigator must be 


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satisfied that the patient has made an informed decision before taking consent.  The patient and the Investigator 
must personally sign and date the current approved version of the informed consent form in each other’s 
presence. A copy of the Patient Information Sheet and signed consent form will be given to the participant. The 
original signed form will be retained in the Investigator Site File (if local policy permits) at the trial site, with a 
copy held in the medical record. Patient consent will be checked using the consent notification section in the 
Patient Registration Form.
5.2
Contraception Requirement and Contraceptive/ Pregnancy counselling 
5.2.1
Contraception Requirement 
M6620 (Berzosertib) has not been assessed in developmental and reproductive toxicity studies at this stage of 
development. However, M6620 (Berzosertib) inhibits DNA damage repair and will be administered in 
conjunction with cytotoxic radiotherapy and chemotherapy, thus the potential for teratogenicity should be 
considered high. Subjects will be required to take stringent measures to avoid fathering or bearing children while 
on study drug and for 6 months after discontinuation of M6620 (Berzosertib). 
5.2.2
Female participant of child-bearing potential  
Female participants of child-bearing potential are required to use highly effective contraceptive measures (see 
below) from the start of study treatment until a minimum 6 months after completion of all treatment 
(chemotherapy, radiotherapy and M6620 (Berzosertib)). Highly effective contraceptive methods considered to 
have a low user dependency* should preferably be used, in particular when contraception is introduced as a 
result of participation in the clinical trial. The use of birth control methods does not apply if the female partner 
has a bilateral oophorectomy, hysterectomy or is postmenopausal. Use of a condom by male partners in 
addition to use of a highly effective contraceptive measure (double barrier method) is not mandated but it can 
be recommended. 
Highly effective contraceptive measures: 

Combined (oestrogen and progestogen containing) hormonal contraception associated with inhibition of 
ovulation  (oral, intravaginal, transdermal) 

Progestogen-only hormonal contraception associated with inhibition of ovulation  (oral, injectable, 
implantable*) 

Intrauterine device (IUD) in place for at least 90 days prior to start of study drug *

Intrauterine hormone-releasing system (IUS) *

Bilateral tubal occlusion *

Vasectomised partner *(provided that partner is the sole sexual partner of the WOCBP trial participant 
and that the vasectomised partner has received medical assessment of the surgical success)  

True abstinence: When this is in line with the preferred and usual lifestyle of the subject. Periodic 
abstinence (e.g. calendar, ovulation, symptothermal, post-ovulation methods), declaration of abstinence 
for the duration of exposure to IMP, and withdrawal are not acceptable methods of contraception). 
5.2.3
Male participants  
Male participants are required to use a condom during treatment (and must avoid donating sperm) for a 
minimum 6 months after completion of all treatment (chemotherapy, radiotherapy and M6620 (Berzosertib)). 
Female partners of male participants, who are of child bearing potential, should also consider contraceptive 
options. 
5.2.4
Pregnancy counselling 
Participants will be counselled to inform the Investigator of any pregnancy (also applies to female partners of 
male trial subjects) occurring within 6 months of the last dose of the study drug. If a pregnancy is confirmed 
female participants will be withdrawn immediately from any ongoing treatment. Participants will be asked to 
provide follow-up information on the outcome of any pregnancy and infants will be followed up for a year 
after birth for congenital abnormality (see section 15 for pregnancy reporting requirements). 
5.3
Pre-dosing evaluations (all stages) 
The majority of evaluations will be standard of care for patients. The following assessments must be 
performed/obtained within the 2 weeks (+7 days allowed) before the patient receives the first study dose (unless 


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otherwise specified below). Informed consent must be obtained prior to performing any study specific 
evaluations.  Confirmation of eligibility and registration on study must be completed as soon as possible after 
consent to allow time for radiotherapy planning in Stage A1. 

Written informed consent  

Demographic details include age, sex, and self-reported race/ethnicity 

Medical History to include cancer history, prior cancer therapies and procedures, reproductive status, 
smoking history, and clinically significant disease history and concomitant diseases  

Concomitant medications 

Physical examination to include lungs, abdomen, heart, nodal regions, neurological examination and 
symptom driven examination. Any abnormality identified at baseline should be recorded. 

Mellow score (Stage B only) 

Height, weight and body surface area (BSA) 

ECOG performance status 

Vital signs: systolic/diastolic blood pressure (BP), pulse rate, temperature 

Screening blood tests: 
o
Haematology – Hb, white blood cells (WBC) with differential count (neutrophils and lymphocytes) 
and platelets 
o
Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP, AST or ALT, Ca, Mg, Phosphate 
o
Coagulation – INR, APTT or PTT. 

Pregnancy test (in females of child bearing potential only): serum or urine Human Chorionic 
Gonadotropin (HCG) test to rule out pregnancy at study entry; results must be obtained and reviewed 
at least 1 week before first dose of IMP. During treatment applicable patients must have pregnancy 
testing every 4 weeks. Pregnancy test not required for post-menopausal or surgically sterile females.   

Electrocardiogram (ECG) 

Pathology report confirming histological diagnosis (archival diagnostic sample will be requested for 
analysis see section 7.3.1). 
In addition for Stage A1 and A2: 

Staging CT scan within 42 days for Stage A1 and 35 days for Stage A2 of first study dose 
In addition for Stage B: 

Staging CT or PET scan within 42 days before first study dose 

Echo cardiogram or MUGA (Multi Gated Acquisition Scan) within 3 months prior to start of treatment 

Lung function tests within 3 months prior to start of treatment 
In addition for Stage A2 and B: 

(If required) Audiogram monitoring for patients with significant hearing impairment 

DPD deficiency testing (any time before trial enrolment). This is not required for Stage A2 participants 
with previous use of Capecitabine. 
5.4
Stage A Evaluations 
5.4.1
Stage A1 evaluations during the study 
Post registration and prior to start of Radiotherapy 

M6620 (Berzosertib) schedule assignment 

Radiotherapy planning (or pre-registration during screening) 
Evaluations Week 1:  
The following assessments should be done Day 1 and Day 4 (+/-24 hours but must be pre-M6620 (Berzosertib)) 
unless stated otherwise: 

Venous blood sample within 24 hours prior to M6620 (Berzosertib) including: 
o
Haematology – Haemoglobin, white blood cells (WBC) with differential count (neutrophils and 
lymphocytes) and platelets 


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o
Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP,  AST or ALT 

Coagulation – INR, APTT or PTT.

Adverse Event (AE) Assessment 

Assessment of concomitant medications 

Physical examination 

Weight (Day 1 only) 

ECOG performance status 

Assessment of DLT (Day 4 only) 

ECG (Day 1 prior to treatment) 

On days of M6620 (Berzosertib) monitor patient for reactions for 20 minutes after administration
Evaluation during radiotherapy and concomitant M6620 (Berzosertib) (Weeks 2 - 3) 
The following assessments should be done the day before each administration of M6620 (Berzosertib) (+/-24 
hours but must be pre-M6620 (Berzosertib)) unless stated otherwise: 

Venous blood sample within 24 hours prior to administration of M6620 (Berzosertib) including: 
o
Haematology – Haemoglobin, white blood cells (WBC) with differential count (neutrophils and 
lymphocytes) and platelets 
o
Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP,  AST or ALT 

Assessment of AE 

Assessment of concomitant medications 

Physical examination 

Weight (Day 8 & 15 only) 

ECOG performance status 

Assessment of DLT 

On days of M6620 (Berzosertib) monitor patient for reactions for 20 minutes after administration 
Evaluations on Week 4, 9 & 12 

Assessment of AE 

Assessment of concomitant medications 

Physical examination 

Weight 

ECOG performance status 

Assessment of DLT (not week 12) 

Coagulation – INR, APTT or PTT (week 4 only) 

Haematology – Haemoglobin, white blood cells (WBC) with differential count (neutrophils and 
lymphocytes) and platelets (week 4 only) 

Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP,  AST or ALT (week 4 only)ECG 
(weeks 4 & 12 only) 

CT chest, abdomen, pelvis (week 12 only). If disease progression is already identified by CT scan 
during the follow up period, a repeat CT scan is not necessary at week 12. 
5.4.2
Stage A1 evaluations on early withdrawal 
Where possible, patients will be followed up as per the follow up visits which should be brought forward to 1, 6 
and 9 weeks post end of treatment; including assessments of AEs and DLTs see section 6.  
5.4.3
Stage A1 off-Study and Follow-up Evaluations 
Where possible, patients will be followed up as per standard of care for 9 weeks post radiotherapy. Patients 
should be counselled on the continued use of contraception for 6 months following the end of treatment if 
appropriate and encouraged to report any pregnancies to the study team. The clinician in charge will be asked 
to provide the following information at 6 and 12 months.  

date and cause of death, if applicable  

details of any clinically significant events 


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
Date and site of progression. 

Further radiotherapy, or other intervention required. 
5.4.4
Stage A2 evaluations during the study 
Post registration 

M6620 (Berzosertib) schedule assignment 

Audiogram monitoring (if applicable) 
Weekly Evaluations during treatment weeks 1 - 18 

Assessment of concomitant medications 

Weight 

ECOG performance status 

Physical examination 

Assessment of AE  

Assessment of DLT (Weeks 1-4 only) 

ECG (once per cycle, week 1 pre-treatment) 

Coagulation – INR, APTT or PTT (week one only, pre-cisplatin) 
Additional evaluations during treatment weeks 1 - 18 

Venous blood sample within 72 hours prior to Cisplatin including: 
o
Haematology – Hb, white blood cells (WBC) with differential count (neutrophils and 
lymphocytes) and platelets 
o
Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP and AST or ALT, Ca, Mg, 
Phosphate 

Venous blood samples within 24 hours prior to M6620 (Berzosertib) administration including:  
o
Haematology – Hb, white blood cells (WBC) with differential count (neutrophils and 
lymphocytes) and platelets 
o
Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP and AST or ALT, Ca, Mg, 
Phosphate 
Note: only one set of blood tests needs to be done if the timing satisfies both Cisplatin and M6620 
(Berzosertib) requirements above.

On days of M6620 (Berzosertib) monitor patient for reactions for 20 minutes after administration 
Additional evaluation Week 4 

Audiogram monitoring (if applicable)
Additional evaluation Week 6, 12, 18 

CT chest abdomen and pelvis to assess response
Evaluations at 2 & 8 week follow up  

Venous blood samples:  
o
Haematology – Hb, white blood cells (WBC) with differential count (neutrophils and 
lymphocytes) and platelets 
o
Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP and AST or ALT, Ca, Mg, 
Phosphate 

Assessment of concomitant medications 

Weight, ECOG performance status 

Physical examination 

Coagulation – INR, APTT or PTT (week 2 only) 

Assessment of AE  

CT chest abdomen and pelvis to assess response (week 26 only) 


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5.4.5
Stage A2 evaluations on early withdrawal 
Where possible, patients will be followed up as per the follow up visits at 2 and 8 weeks post end of treatment, 
including assessments of AEs and DLTs (see section 6).  
5.4.6
Stage A2 off-Study and Follow-up Evaluations 
The final study visit will occur 8 weeks after completion of treatment. Patients should be counselled on the 
continued use of contraception for 6 months following the end of treatment if appropriate and encouraged to 
report any pregnancies to the study team. The clinician in charge will be asked to provide the following reports 
at 6 & 12 months.  

date and cause of death, if applicable  

date and site of progression 

details of any clinically significant events 

further chemotherapy or other intervention required 
5.5
Stage B evaluations 
Post registration and prior to start of Induction chemotherapy 

Research blood sample 

Audiogram monitoring (if applicable) 
5.5.1
Stage B evaluations during the study 
Evaluations during treatment weeks 1 & 4 (induction chemotherapy + M6620 (Berzosertib)) and weeks 7, 8, 
9, 10 & 11 (chemoradiotherapy + M6620 (Berzosertib)) 

The following assessments should be done within 24 hours prior to M6620 (Berzosertib) 
administration: Venous blood samples within 24 hours prior to M6620 (Berzosertib) administration 
including:  
o
Haematology – Hb, white blood cells (WBC) with differential count (neutrophils and 
lymphocytes) and platelets 
o
Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP and AST or ALT, Ca, Mg, 
Phosphate 

Assessment of concomitant medications 

Weight 

ECOG performance status 

Vital signs: systolic/diastolic blood pressure (BP), pulse rate, temperature 

Physical examination 

ECG (weeks 1, 4, 7 and 10 pre-cisplatin treatment) 

Coagulation (INR, APTT or PTT, week 1 only pre-cisplatin) 

Mellow score 

Assessment of AE  

Assessment of DLT (not week 1) 
The following assessments should be done on days of M6620 (Berzosertib) administration during induction 
chemotherapy. If problems were identified, this should be continued during chemoradiotherapy: 

Monitor patient for reactions for 20 minutes after administration of M6620 (Berzosertib) 
Additional assessments weeks 1, 4, 7 & 10 

Venous blood sample within 72 hours prior to Cisplatin including: 
o
Haematology – Hb, white blood cells (WBC) with differential count (neutrophils and 
lymphocytes) and platelets 
o
Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP and AST or ALT, Ca, Mg, 
Phosphate 
Note: only one set of blood tests needs to be done if the timing satisfies both Cisplatin and M6620 
(Berzosertib) requirements above.


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Additional evaluation week 4 

Audiogram monitoring (if applicable) 
Additional assessments week 7 (see section 7.3 for details) 

Research endoscopy and biopsy 

Research blood sample  
Radiotherapy planning should take place in weeks 2 to 4 and M6620 (Berzosertib) schedule assignment will 
take place in week 6 
Evaluations during induction chemotherapy weeks 2 & 5  
Evaluations to be done on day 1 or day 2: 

Assessment of concomitant medications 

ECOG performance status 

Vital signs: systolic/diastolic blood pressure (BP), pulse rate, temperature 

Physical examination 

Mellow score 

Assessment of AE  

Assessment of DLT 
Evaluations at weeks 12 & 18  

Venous blood samples: 
o
Haematology – Hb, white blood cells (WBC) with differential count (neutrophils and 
lymphocytes) and platelets 
o
Biochemistry – sodium, potassium, urea, creatinine, bilirubin, ALP and AST or ALT, 
Ca, Mg, Phosphate 

Assessment of concomitant medications 

ECOG performance status 

Vital signs: systolic/diastolic blood pressure (BP), pulse rate, temperature 

Coagulation (INR, APTT or PTT, week 12 only) 

Physical examination 

Mellow score 

Assessment of AE  

Assessment of DLT 

Research blood sample (week 12 only) 
Evaluations at week 24 

Assessment of concomitant medications 

ECOG performance status 

Vital signs: systolic/diastolic blood pressure (BP), pulse rate, temperature 

Physical examinations 

ECG 

Mellow score 

Assessment of AE 

Assessment of DLT 

Endoscopy and research biopsy  

CT chest abdomen and pelvis to assess response 
5.5.2
Stage B evaluations on early withdrawal 
Where possible, patients will be followed up as per the follow up visits which should be brought forward to 1, 
7 and 13 weeks post end of treatment, including assessments of AEs and DLTs see section 6.  
5.5.3
Stage B off-Study and Follow-up Evaluations 
The final study visit will occur 13 weeks after completion of treatment. Patients should be counselled on the 
continued use of contraception for 6 months following the end of treatment if appropriate and encouraged to 


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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report any pregnancies to the study team. Sites will report this if notified up until 6m or 13w after last patient 
treatment whichever is sooner.   
6
EARLY PATIENT WITHDRAWAL 
The Trial Office should be informed of any early patient withdrawal within 24 hours of the site becoming 
aware using the Early Withdrawal Form and scan and email as a PDF attachment to  
octo-safety@oncology.ox.ac.uk. If the reason for early withdrawal is an SAE then an SAE Form will also be 
required. 
6.1
Treatment Withdrawal 
During the course of the trial, a patient may withdraw early from treatment.  This may happen for a number of 
reasons, including: 

Unacceptable toxicity 

AE/SAEs requiring discontinuation 

Loss to follow-up 

Significant protocol deviation or inability to comply with trial procedures 

Clinical decision 

Patient decision 
When the patient stops treatment early, the ‘End of Treatment’ Form needs to be completed, and any other 
relevant CRFs (example SAE Form).  Any evaluations carried out on early withdrawal will be captured as per 
sections 5.4.2, 5.4.5 and 5.5.2. The reason for withdrawing from treatment early should be clearly documented 
in the medical records.  
The end of treatment means the patient will then enter the routine follow up stage of the trial. If M6620 
(Berzosertib) treatment is stopped, the patient will continue with standard treatment and will be followed up as 
part of the trial. 
6.2
Consent Withdrawal 
Consent withdrawal means that a patient has expressed a wish to withdraw from the study altogether.  Under 
these circumstances, the site needs to document all relevant discussions in the patient notes and notify the Trial 
Office, which will allow the office to mark all future CRFs as not applicable. The site should inform the Trial Office 
whether any samples already collected for the study should be destroyed. 
Under these conditions, investigators are still responsible to follow up any SAEs till resolution. 
6.3 
Patient evaluability and replacement 
Patients will not be replaced since TiTE-CRM uses accumulated data and all patients will be evaluable for dose 
escalation decisions. However, the TMG may decide to replace patients if drop-out occurs early in the treatment 
schedule for reasons other than a DLT.  
In Stage B, all patients who receive treatment within the study will be evaluable for response. All participants 
who receive one dose of M6620 (Berzosertib) will be evaluable for the safety analysis.   
Evaluable for Objective Response.  Only those patients who have measurable disease present at baseline, have 
received at least one cycle of therapy, and have had their disease re-evaluated will be considered evaluable for 
response.  These patients will have their response classified according to the definitions stated in Appendix B.  
(Patients who exhibit objective disease progression prior to the end of cycle 1 will be considered evaluable.) 
Evaluable Non-Target Disease Response.  Patients who have lesions present at baseline that are evaluable but 
do not meet the definitions of measurable disease, have received at least one cycle of therapy, and have had 
their disease re-evaluated will be considered evaluable for non-target disease.  The response assessment is 
based on the presence, absence, or unequivocal progression of the lesions.  


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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7
SAMPLES FOR LABORATORY ANALYSIS 
7.1
Samples to be analysed in local Trust’s laboratories 
Diagnostic Laboratories 
Samples for haematology and biochemistry analysis will be labelled with standard patient identifiers and sent to 
the local hospital diagnostic laboratory. Results will be processed in the standard way and entered into the 
routine hospital reporting system. Samples will be stored, held, reported and subsequently destroyed in 
accordance with standard local laboratory practice.  
Pathology 
The routine diagnostic pathology samples and additional research samples taken at endoscopy will also be 
labelled, processed and reported according to the standards proposed by the Royal College of Pathologists.  An 
anonymised copy of the diagnostic histopathology/cytology report should be sent to the Trial Office at 
registration. 
7.2
Blood and Tissue samples for translational research  
Blood and biopsy samples will be collected in Stage B for translational research concerning the mechanism of 
action of M6620 (Berzosertib).  
7.2.1
Biopsy samples 
Tissue samples will be collected at least 24 hours after the first dose of M6620 (Berzosertib) treatment. The 
samples will be analysed for a signal of ATR inhibition by M6620 (Berzosertib) following induction of the DDR 
(ATR activity) by Cisplatin or RT treatment.  
Tissue should be biopsied from 3 areas of the oesophagus: normal tissue outside the radiotherapy field, normal 
tissue within the radiotherapy field and tumour tissue within the radiotherapy field. This will allow a comparison 
of the effect of M6620 (Berzosertib) on healthy tissue, irradiated tissue and tumour tissue. 
All participants will have a diagnostic biopsy prior to screening. Baseline FFPE tissue samples will be analysed 
for common genetic mutations using a cancer panel.  
Timepoints for endoscopy and biopsy: 

week 7 day 3, and if M6620 (Berzosertib) given carried out at least 24 hours after the administration 
of M6620 (Berzosertib) (on treatment biopsy should be taken from fraction 3 to fraction 5 (but up to 
fraction 7 is permitted if required) 

week 24 
Samples will be sent to the central lab for IHC analysis (see Sample Handling Manual for further details). 
Remaining samples will be returned to Oxford for further IHC markers and storage in Oxford research biobank 
(details will be in the sampling handling manual). 
7.2.2
Research blood samples 
Blood samples will be collected to look for biomarkers for ATR inhibition and to identify other DNA, RNA or 
protein markers present in oesophageal cancer. 
Timepoints for research blood samples:

prior to starting treatment 

week 7 from fraction 3 to fraction 5 (but up to fraction 7 is permitted if required) 

week 12  
Samples will be sent to Oxford University Labs for analysis (details will be in the sampling handling manual). 
7.3
Labelling and confidentiality of samples sent 
All samples sent to analytical Laboratories will be labelled with the trial code, trial patient number, schedule and 
date/time taken.  Should a laboratory receive any samples carrying unique patient identifiers the recipient must 
immediately obliterate this information and re-label.  


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7.4
Clinical reporting of exploratory research assay results 
The results of the CHARIOT trial research assays are exploratory and are not intended to influence the individual 
patient’s medical care. Findings will not be reported routinely to the responsible clinician except in the unlikely 
event that the result might be beneficial to the patient’s clinical management. 
7.5
Trial sample retention at end of study 
The Chief Investigator has overall responsibility for custodianship of the trial samples. Laboratories are 
instructed to retain any surplus samples pending instruction from the Chief Investigator on use, storage or 
destruction.  It is possible that new or alternative assays may be of future scientific interest. At the end of the 
research study any surplus samples may be retained for use in other projects that have received ethical approval.  
Hence, any surplus study samples may be transferred to a licensed tissue bank where they will be managed in 
accordance with applicable host institution policies and the Human Tissue Act (HTA) requirements.  
7.6
Withdrawal of consent for sample collection and/or retention 
A patient may withdraw consent to provide samples for research at any time without giving a reason. The 
Investigator must ensure that their wishes are recorded in the medical record and will inform the Trial Office 
accordingly. The Investigator should discuss with patients the valuable use of samples that have already been 
provided and under circumstances where these samples have already been processed and anonymised, it would 
not be possible to destroy such samples. 


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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8
INVESTIGATIONAL MEDICINAL PRODUCTS (IMP)  
The trial is investigating the unlicensed drug M6620 (Berzosertib) in combination with the radiotherapy (stage 
A1); M6620 (Berzosertib) in combination with chemotherapy agents Cisplatin and Capecitabine (stage A2) and 
M6620 (Berzosertib) with chemoradiotherapy (stage B). For the purposes of the trial, M6620 (Berzosertib), 
Cisplatin and Capecitabine are all considered IMPs.
8.1
Stage A1 Treatment 
Two M6620 (Berzosertib) dose levels and 3 dosing frequencies (treatment schedules) are proposed. Both the 
dose and frequency of M6620 (Berzosertib) will vary but the administered radiation dose and fractionation 
schedule will remain unchanged across treatment plans. The treatment schedule will last for 3 weeks and 
radiotherapy must start on a Monday. 
Antiemetics should be prescribed as supporting medication to be available from Day 1 of Radiotherapy, ( i.e. 
Domperidone 20mg tds prn PO 5/7 or Metoclopramide 20mg tds prn PO 5/7, or the preferred standard of care 
at the institution) 
8.1.1
M6620 (Berzosertib) treatment schedules - Stage A1 
The starting dose of M6620 (Berzosertib) will be 140mg/m2 IV once weekly (schedule 1).  If schedule 1 is too 
toxic, the trial will be re-started at 90mg/m2 (schedule -3). For all schedules see table 8.1. The treatment 
schedule of M6620 (Berzosertib) will be escalated or de-escalated using the TiTE-CRM model (see section 2 for 
further details).  
Table 8.1 
Dose Escalation schedule 
Treatment 
schedule
Dose** of M6620 (Berzosertib) and days of the schedule it will be delivered
 -3 
90 mg/m2 day 2, 9, 16 
-2 
90 mg/m2 day 2, 5, 9, 12, 16 
-1 
90 mg/m2 day 2, 5, 9, 12, 16, 19 
1* 
140 mg/m2 day 2, 9, 16  
2 
140 mg/m2 day 2, 5, 9, 12, 16 
3 
140 mg/m2 day 2, 5, 9, 12, 16, 19 
4 
240 mg/m2 day 2, 9, 16 
5 
240 mg/m2 day 2, 5, 9, 12, 16 
6 
240 mg/m2 day 2, 5, 9, 12, 16, 19 
*Starting dose and schedule. 90mg/m2 dose will only be explored if trial is re-started 
**Doses are stated as exact dose in units. No intermediate dose levels or further splitting of the dose allowed
8.1.2
Radiotherapy dose and duration –Stage A1 
The total dose of radiation will be 35Gy in 15 fractions treated once daily, 5 days a week Monday to Friday and 
prescribed and recorded per ICRU 62. 


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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8.1.3
Stage A1: Dose Escalation Schema
Schedule -3 – 90 mg/m2, 270 mg/m2 per plan 
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
 
 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
Schedule -2 – 90 mg/m2, 450 mg/m2 per plan 
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
 
 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
M
M
Schedule -1 – 90 mg/m2, 540 mg/m2 per plan 
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
 
 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
M
M
M
Schedule 1 – 140 mg/m2 per dose, 420 mg/m2 per plan (starting schedule) 
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
Schedule 2 – 140 mg/m2, 700 mg/m2 per plan 
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
 
 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
M
M
Schedule 3 – 140 mg/m2, 840 mg/m2 per plan 
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
 
 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
M
M
M
Schedule 4 – 240 mg/m2, 720 mg/m2 per plan 
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
 
 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
Schedule 5 – 240 mg/m2, 1200 mg/m2 per plan 
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
 
 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
M
M
Schedule 6 – 240 mg/m2, 1440 mg/m2 per plan 
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
 
 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
M
M
M


CHARIOT: M6620 (Berzosertib) plus standard treatment in oesophageal and other cancer
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8.2
Stage A2 Treatment  
Two dose levels and 2 dosing frequencies (treatment schedules) are proposed. Both the dose and frequency of 
M6620 (Berzosertib) will vary but the Cisplatin and Capecitabine dose and schedule will remain unchanged 
across treatment plans. The treatment schedule will last for 6 cycles (18 weeks). 
8.2.1
M6620 (Berzosertib) treatment schedule – Stage A2 
The starting dose of M6620 (Berzosertib) will be 90mg/m2 IV once weekly (schedule 1). For all schedules see 
table 8.2. The treatment schedule of M6620 (Berzosertib) will be escalated or de-escalated using the TiTE-CRM 
model (see section 2 for further details). 
Table 8.2 
Dose Escalation schedule 
Treatment 
schedule
Dose of M6620 (Berzosertib) and days of the schedule it will be delivered
1 
90 mg/m2 once a week for 18 weeks (Tuesdays) 
2 
90 mg/m2 twice a week for 18 weeks (Tuesdays and Fridays) 
3 
140 mg/m2 once a week for 18 weeks (Tuesdays) 
4 
140 mg/m2 twice a week for 18 weeks (Tuesdays and Fridays) 
*Doses are stated as exact dose in units. No intermediate dose levels or further splitting of the dose allowed 
8.2.2
Chemotherapy dose and duration - Stage A2 
Chemotherapy (Weeks 1 – 18) 
Cisplatin  
60mg/m2 IV Day 1 of 21-day cycle for 6 cycles  
Capecitabine 
625mg/m2 po bd Days 1-21 of 21-day cycle for 6 cycles 
8.2.3
Stage A2 Dose escalation schema 
Repeat this 3 weekly schedule for 6 cycles 
Repeat this 3 weekly schedule for 6 cycles 
Dosing 
schedule 
1,3
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Capecitabine 
Cisplatin 
C 
ATR 
Inhibitor
M
M
M
Dosing 
schedule 
2, 4
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Capecitabine 
Cisplatin 
C 
ATR 
Inhibitor
M
M
M
M
M
M


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8.3
Stage B Treatment  
The dose administered in stage B will be 140mg/m2 (see section 2.3) and will remain constant whilst three dosing 
schedules are explored (see table 8.3). The chemotherapy and radiation doses and fractionation schedules will 
remain unchanged across dosing schedules.  
The 11 weeks of treatment consists of 6 weeks of induction chemotherapy (Capecitabine and Cisplatin) with 
M6620 (Berzosertib) followed by 5 weeks of concomitant chemoradiotherapy (Capecitabine, Cisplatin and 
radiotherapy) with M6620 (Berzosertib). All patients will receive M6620 (Berzosertib) with induction 
chemotherapy on Cycle 1 Day 2 and Cycle 2 Day 2. In the last week of chemotherapy patients will be assigned 
to a M6620 (Berzosertib) treatment schedule to be administered during chemoradiotherapy (see table 8.3 
below). Radiotherapy must start on a Monday. 
8.3.1
M6620 (Berzosertib) Treatment dose and schedule – Stage B 
The dose of M6620 (Berzosertib) in Stage B will be 140mg/m2, allocation will start on schedule 1. 
Table 8.3 
Dose Escalation Schedule  
Treatment 
Schedule 
M6620 (Berzosertib) administration 
during  induction chemotherapy 
M6620 (Berzosertib) administration during  
Chemoradiotherapy 
-1 
Cycle 1 day 2, 
Cycle 2 day 2 
Days 2, 9, 16, 23, 30 
1* 
As above 
Days 2, 5, 9, 16, 23, 26, 30 
2 
As above 
Days 2, 5, 9, 12, 16, 19, 23, 26, 30, 33 
*Starting schedule. Reduced frequency schedule (-1) will only be explored if schedule 1 is too toxic. 
8.3.2
Chemoradiotherapy dose and duration - Stage B 
Induction Chemotherapy (Weeks 1 – 6) 
Cisplatin  
60mg/m2 IV Day 1 of 21-day cycle for 2 cycles (Days 1 and day 22 of chemotherapy) 
Capecitabine 
625mg/m2 po bd Days 1-21 of 21-day cycle for 2 cycles 
Concurrent chemoradiotherapy (Weeks 7 – 11) 
Cisplatin  
60mg/m2 IV Day 1 of 21-day cycle for 2 cycles (Days 1 and day 22 of chemoRadiotherapy) 
Capecitabine 
625mg/m2 po bd on days receiving radiotherapy (From day 1 to day 33 of 
chemoradiotherapy excluding days not receiving radiotherapy)  (Total 25 days of treatment) 
8.3.3
Radiotherapy dose and duration - Stage B 
The total dose of radiation will be 50Gy in 25 fractions treating once daily, 5 days per week Monday to Friday 
and prescribed and recorded as per ICRU 62. 


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8.3.4
Stage B Dose frequency escalation schema 
Induction Chemotherapy - All patients
Week 1 
Week 2 
Week 3 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Capecitabine 
Cisplatin 
C 
ATR Inhibitor 
M 
Week 4 
Week 5 
Week 6 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Capecitabine 
Cisplatin 
C 
ATR Inhibitor 
M 


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Chemoradiotherapy dosing frequency escalation schema  
Dosing 
schedule
-1
Week 7 
Week 8 
Week 9 
Week 10 
Week 11 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Capecitabine 
Cisplatin 
C 
C 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
M 
M
Dosing 
schedule
1
Week 7 
Week 8 
Week 9 
Week 10 
Week 11 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Capecitabine 
Cisplatin 
C 
C 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
M
M 
M
M
Dosing 
schedule 
2
Week 7 
Week 8 
Week 9 
Week 10 
Week 11 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
M 
T 
W 
T 
F 
S 
S 
Capecitabine 
Cisplatin 
C 
C 
Radiotherapy 
X 
X 
X 
X 
X 
 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
ATR Inhibitor 
M 
M
M
M
M
M
M 
M
M
M


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8.4
Management of M6620 (Berzosertib) drug administration 
M6620 (Berzosertib) will be administered intravenously over 60 minutes (±10 minutes) approximately one hour after 
radiotherapy in stage A1 and B. When the total volume of infusion exceeds 600mL, the infusion may be extended by up 
to 30 minutes. Intravenous administration of M6620 (Berzosertib) is independent of food intake. When given after 
chemotherapy, the M6620 (Berzosertib) should be initiated approximately 24 hours (+/- 4hours) after cessation of 
cisplatin infusion (continue with Capecitabine as prescribed). The cannula should be removed following each infusion. 
Consideration of a Peripheral Inserted Catheter should be given if there are difficulties accessing a vein. 
M6620 (Berzosertib) is associated with infusion-related reactions, e.g., infusion site erythema, infusion site reaction, 
and catheter site related reaction. Infusion reactions are common with IV administration of drugs used to treat 
cancer. These reactions occur during or shortly after administration of the drug and are diverse. They may include 
pruritus, flushing, chills/rigors, urticaria/rash, headache, bronchospasm/dyspnea, and hypotension or hypertension, 
among others.  Infusion-related reactions, nausea, and vomiting are considered adverse drug reactions (ADRs) for 
MK6620. 
The infusion can be mildly irritating so it is necessary to monitor the intravenous catheter site closely for evidence of 
erythema, tenderness or induration. To minimize the possibility of phlebitis, M6620 (Berzosertib) should be 
administered through a large bore catheter into a large caliber peripheral vein. The intravenous infusion site should be 
monitored closely for the development of erythema, induration, purulence, tenderness, or warmth. If any subject 
develops phlebitis, or signs or symptoms of inflammation that may progress to phlebitis or that the patient cannot 
tolerate, standard measures should be employed to ameliorate these symptoms (including removal of the infusion 
catheter and resumption of infusion through a different vein). 
If any subject develops pruritus, flushing, or any other symptom suggestive of a systemic infusion reaction, standard 
measures should be employed to manage these symptoms (e.g. antihistamines and/or steroids, fluid support). Any non-
serious reaction such as pruritis, can be prevented in subsequent administration by appropriate desensitizing measures 
prior to the administration of the study drugs as long as they are not prohibited by protocol (e.g. Corticosteroid and 
antihistamine combinations that may be used include: 100 mg to 200 mg hydrocortisone intravenously approximately 
60 minutes (± 15 minutes) before M6620 (Berzosertib) infusion, and either 10 mg of chlorphenamine intravenously 
approximately 30 minutes (± 10 minutes) before M6620 (Berzosertib) infusion. Alternative antihistamine and steroid 
doses, timing, routes of administration and agents may be considered, as long as not prohibited by protocol. In addition, 
treatment with an H2-blocker (e.g., ranitidine) may be considered for subjects not responsive to a regimen with an 
H1-blocker. If standard procedures to limit symptoms of an infusion reaction have failed, further re-challenges are 
prohibited. 
Serious acute hypersensitivity reactions have occurred in a few subjects receiving M6620 (Berzosertib). These reactions 
occurred within minutes of re-exposure to M6620 (Berzosertib), and in cases reported to date, they have occurred 
during the second infusion. They may include hypotension and mental status changes. All subjects have fully recovered 
with standard treatment for this reaction, including immediate discontinuation of the inciting infusion and 
administration of IV corticosteroid and antihistamine, as well as IV fluids and oxygen when clinically indicated. If a 
serious acute hypersensitivity reaction occurs M6620 (Berzosertib) should be permanently withdrawn and reported as 
an SAR. For management of M6620 (Berzosertib) toxicity or missed doses see section 9.3. 
Laboratory values required for administration of M6620 (Berzosertib) and chemotherapy 
Laboratory parameter 
Cycle 1 Day 1 
Day 1 of subsequent 
cycles 
Other days M6620 (Berzosertib) 
administered alone or with 
Capecitabine  
Haemoglobin 
≥8.0g/dL Stage A1; 
≥10.0g/dL Stage A2/B 
≥8.0g/dL Stage A1/A2; 
≥10.0g/dL Stage 
B(during radiotherapy) 
≥7.0g/dL (if asymptomatic)
Absolute neutrophil count 
≥1.5 X 109/L 
≥1 X 109/L 
≥1.0 X 109/L 
Platelet count 
≥100 X 109/L 
≥75 X 109/L 
≥75 X 109/L


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AST/ALT 
≤2.5 X ULN or 
≤5 X ULN if liver 
metastases 
≤2.5 X ULN or 
≤5 X ULN if liver 
metastases 
≤2.5 X ULN or 
≤5 X ULN if liver metastases or 
capecitabine given alone 
Estimated glomerular 
filtration rate 
≥40mL/min A1 or 
≥60mL*/min Stage 
A2/B 
≥60mL/min Stage A2/B 
Not required 
Total Bilirubin (serum) 
≤1.5 X ULNa
Not required 
Not required
a – unless subject has known or suspected Gilbert’s syndrome 
* if below 60ml/min, formal Creatinine clearance required (EDTA glomerular function rate, or 24 hours urine 
collection), and 100% dose cisplatin may be administered if formal result is ≥50ml/min 
8.5
Management of capecitabine administration 
Patients will be instructed to take capecitabine tablets at a dose of 625mg/m2 twice a day as per standard practice 
starting in the evening of day 1 of each cycle (stage A2 and B). For patients who find swallowing capecitabine difficult, 
it is possible to dissolve the tablets in lukewarm water. The capecitabine tablets should be placed in approximately 
200ml of lukewarm water. By stirring for about 15 minutes the tablets should dissolve. There is no stability data for 
any form of capecitabine suspension, so this should be done immediately prior to use and the solution swallowed 
immediately, rinsing to ensure all of the contents are ingested. As the solution will have a bitter taste it could be 
flavoured with a fruit juice or squash, but grapefruit juice should not be used. The solution may also be administered 
through a naso-gastric tube or other enteral feeding tube. Please note that dissolving capecitabine is outside of its 
licensed indication. 
In addition, it is recommended that patients are carefully monitored for ophthalmologic complications, such as keratitis 
and corneal disorders, especially if they have a prior history of eye disorders. Treatment of eye disorders should be 
initiated promptly. For patients with diabetes mellitus, caution must be exercised as it may be aggravated. 
Concurrent chemoradiotherapy (Weeks 7-11) 
Patients should be instructed to take the drug twice daily as above only on the days radiotherapy is delivered.  
Where the start of radiotherapy is delayed for scheduling reasons Day 1 of the third cycle of chemotherapy, i.e. Day 1 
of the start of concurrent chemotherapy, should also be delayed such that the 2 treatments start together. 
Additional dosing requirements are: 

Missed doses/dosing day will not be made up. The next dose must be taken as scheduled. The missed tablets should 
be brought at next clinic visit to be handed over to the research nurse.  

If a patient vomits after taking the tablets, they should not take another dose. The next doses should be taken as 
scheduled.  

Doses should NOT be doubled to make up for missed doses.   

Any unused tablets should be returned to pharmacy (via research nurse). All patients are asked to keep a record of 
their capecitabine use in their diary card. 
8.6
Management of cisplatin administration 
Cisplatin will be administered on day 1 of a 3 weekly cycle. From weeks 1 to 18 for Stage A2 and 1-11 for Stage B as an 
intravenous infusion at 60mg/m2 over 2 hours on treatment days or as per local policy. The hydration regimen for 
cisplatin administration will be determined by locally agreed pharmacy procedures and guidelines. Pre and post anti-
emetics should be given according to local practice for high risk emesis. Laboratory values required for administration 
of chemotherapy will be as per standard policy (for administration of M6620 (Berzosertib) see section 8.4). Patient 
monitoring and management of hypersensitivity and extravasation will be as per local hospital policy. Patients with 
significant hearing impairment will be made aware of potential ototoxicity. For those who choose to be included, it is 
recommended that audiograms be carried out at baseline and prior to cycle 2. Gastric protection (Proton Pump inhibitor 
or H2 blocker) is recommended for all patients for duration of therapy and for at least 6 weeks thereafter. 


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On days of concurrent chemo-radiation, cisplatin should be completed before radiotherapy treatment. Patients may 
undergo their radiotherapy during the post-hydration following cisplatin, which may be interrupted provided it is 
completed afterwards.  
8.7
Managing delays to Chemotherapy and Radiotherapy  
Where the start of radiotherapy is delayed for scheduling reasons Day 1 of the third cycle of chemotherapy, i.e. Day 1 
of the start of concurrent chemotherapy, should also be delayed such that the 2 treatments start together. The decision 
as to the scheduling of chemotherapy as a result of delays to radiotherapy due to machine service days or breakdowns 
i.e. unscheduled interruptions to radiotherapy should be made at the clinical discretion of the local PI, although the first 
treatment of radiotherapy must be given on the same first day of cycle 3 of the chemotherapy schedule. Management 
of hypersensitivity and extravasation will be as per local hospital policy.  
8.8
Laboratory values required for administration of chemotherapy 
See table in section 8.4.
8.9
Calculating and recalculating doses 
The dose of M6620 (Berzosertib) will be calculated for each patient based on actual weight. BSA will be calculated 
according to the DuBois and DuBois formula. The patient’s weight should be recorded prior to every chemotherapy or 
chemoradiotherapy cycle to determine dose of chemotherapy.  If a patient’s weight changes by ≥ 10% from baseline 
then drug doses should be recalculated. If a patient’s weight changes by <10% the dose may be adjusted according to 
local policy/clinician’s discretion, but is not an absolute requirement. 
8.10
Chemotherapy Dose-banding 
Dose banding will be permitted as per local hospital policy (assumes dose banding is within 5% of actual calculated 
dose). The Trials Office will request each site to state upfront whether or not dose banding will be used. 
8.11
Dose capping 
 There will be no dose capping.  
8.12
Compliance 
Patients will be instructed to keep a record of compliance in terms of their capecitabine treatment, by means of using 
a study patient diary card provided to the patient by the site. Patients should be asked to bring completed diary cards 
or other records and all their unused / remaining capecitabine tablets (empty, open or unopened) with them to each 
clinic visit. Sites should count remaining capecitabine at each visit. The patient diary cards should not be sent to the 
Trial Office but kept by the centre to monitor patient drug compliance. Compliance of M6620 (Berzosertib) and Cisplatin 
will be monitored by the patient record. 
Accountability logs are required for capecitabine to determine that patients have received at least 80% of the prescribed 
treatment dose. Returns should be reconciled against the patient diary and the reason for any discrepancy documented. 
Site staff will collect and count patient returns which must be recorded on the drug accountability log. 
8.13
Management of overdose 
Overdose of M6620 (Berzosertib) can result in an increase in the severity of M6620 (Berzosertib) toxicities (section 
9.3.2). Medical management of overdose should include stopping the chemotherapeutic agents and customary 
therapeutic and supportive medical interventions aimed at correcting the presenting clinical manifestations and 
preventing their possible complications. An overdose of cisplatin or capecitabine should be managed as per standard 
policy. 


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9
TOXICITY MANAGEMENT 
9.1
Dose Limiting Toxicity 
9.1.1
Reporting a DLT 
A dose limiting toxicity is a toxicity that is considered related to M6620 (Berzosertib) or the interaction between M6620 
(Berzosertib) and radiotherapy or chemoradiotherapy.  Dose limiting toxicities should be reported within 24 hours of 
the site becoming aware using the SAE form and scan and email as a PDF attachment to octo-
safety@oncology.ox.ac.uk and send an email notification to octo-CHARIOT@oncology.ox.ac.uk. For management of 
M6620 (Berzosertib) toxicities see section 9.3. Chemotherapy and radiotherapy toxicities should be managed as per 
standard practice.
9.1.2
Definition of a DLT 
Stage A1 
DLTs will be defined as per NCI CTCAE v4.03 and include: 

Absolute neutrophil count (ANC) <0.5 x 109/L for >7days  

Febrile neutropenia (fever of unknown origin without clinically or microbiologically documented infection) (ANC 
<1.0 x 109/L, fever >38.5oC) lasting >3 days 

Infection (documented clinically or microbiologically) with Grade 3 or 4 neutropenia (absolute neutrophil count 
<1.0 x 109/L) 

Platelets <25 x 109/L 

Clinically significant bleeding attributed to grade 3 thrombocytopenia or requiring platelet transfusion 

Grade ≥3 oesophagitis onset within 2 weeks of starting radiotherapy 

Grade ≥3 pneumonitis onset within 3 months of starting radiotherapy 

Grade ≥3 nausea or vomiting not controlled by optimal outpatient anti-emetic treatment 

Grade ≥3 diarrhoea despite optimal outpatient anti-diarrhoeal medication use 

Other grade 3 ≥ effects thought to be directly treatment related to the combination of M6620 (Berzosertib) with 
radiotherapy  

Any toxicity causing a delay of radiotherapy completion by greater than one week 

Missing 2 consecutive doses of M6620 (Berzosertib) within a cycle due to Grade ≥3  toxicity  

A delay of any of the 3 treatments of 7 days or more within a cycle due to treatment related toxicity  

An elevation of ALT or AST  >5 x ULN lasting 8 days or more 

A concurrent elevation of ALT or AST >3 × ULN and total bilirubin >2 × ULN in whom there is no evidence of 
biliary obstruction or other causes that can reasonably explain the concurrent elevation 

Death due to drug related complications 

Cardiac: 
-
QTc prolongation (any QTc interval ≥500 msec or any change in QTc interval ≥60 msec from baseline) on ECG, 
unless related to an electrolyte abnormality and prolongation resolves with correction of electrolyte abnormality 
-
Any of the following (CTCAE criteria): Grade 2 or greater ventricular arrhythmia (second or third degree AV 
block), severe sustained/symptomatic sinus bradycardia less than 45 beats per minute (bpm) or sinus 
tachycardia >120 bpm not due to other causes (e.g., fever), persistent supraventricular arrhythmia (e.g., 
uncontrolled/new atrial fibrillation, flutter, atrioventricular nodal tachycardia, etc.) lasting more than 24 hours, 
ventricular tachycardia defined as >9 beats in a row or any length of torsades de pointes (polymorphic 
ventricular tachycardia with long QTc), or unexplained recurrent syncope 
-
Symptoms suggestive of congestive heart failure with confirmed Ejection Fraction (EF) <40% (by 2D-
echocardiogram or Multiple Gated Acquisition [MUGA] scan)  
-
Troponin T: level which is consistent with myocardial infarction 
Stage A2 
DLTs will be defined as per NCI CTCAE v4.03 and include: 

Absolute neutrophil count (ANC) <0.5 x 109/L for >7days  

Febrile neutropenia (fever of unknown origin without clinically or microbiologically documented infection) (ANC 
<1.0 x 109/L, fever >38.5oC) lasting >3 days 


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
Infection (documented clinically or microbiologically) with Grade 3 or 4 neutropenia (absolute neutrophil count 
<1.0 x 109/L) 

Platelets <25 x 109/L 

Clinically significant bleeding attributed to  grade 3 thrombocytopenia or requiring platelet transfusion 

Grade ≥3 nausea or vomiting not controlled by optimal outpatient anti-emetic treatment 

Grade ≥3 diarrhoea despite optimal outpatient anti-diarrhoeal medication use 

Other grade ≥3  effects thought to be directly treatment related to the combination of M6620 (Berzosertib) with 
chemotherapy 

Missing 2 consecutive doses of M6620 (Berzosertib) within a cycle due to Grade ≥3 toxicity 

A delay of any of the 3 treatments of 7 days or more within a cycle due to treatment related toxicity 

An elevation of ALT or AST  >5 x ULN lasting 8 days or more 

A concurrent elevation of ALT or AST >3 × ULN and total bilirubin >2 × ULN in whom there is no evidence of 
biliary obstruction or other causes that can reasonably explain the concurrent elevation 

Death due to drug related complications 

Cardiac: 
-
QTc prolongation (any QTc interval ≥500 msec or any change in QTc interval ≥60 msec from baseline) on ECG, 
unless related to an electrolyte abnormality and prolongation resolves with correction of electrolyte abnormality 
-
Any of the following (CTCAE criteria): Grade 2 or greater ventricular arrhythmia (second or third degree AV 
block), severe sustained/symptomatic sinus bradycardia less than 45 beats per minute (bpm) or sinus 
tachycardia >120 bpm not due to other causes (e.g., fever), persistent supraventricular arrhythmia (e.g., 
uncontrolled/new atrial fibrillation, flutter, atrioventricular nodal tachycardia, etc.) lasting more than 24 hours, 
ventricular tachycardia defined as >9 beats in a row or any length of torsades de pointes (polymorphic 
ventricular tachycardia with long QTc), or unexplained recurrent syncope 
-
Symptoms suggestive of congestive heart failure with confirmed Ejection Fraction (EF) <40% (by 2D-
echocardiogram or Multiple Gated Acquisition [MUGA] scan)  
-
Troponin T: level which is consistent with myocardial infarction 
Stage B 
Acute DLTs will be defined as per NCI CTCAE v4.03 and include: 

Absolute neutrophil count (ANC) <0.5 x 109/L for >7days 

Febrile neutropenia (fever of unknown origin without clinically or microbiologically documented infection) (ANC 
<1.0 x 109/L, fever >38.5oC) lasting >3 days 

Infection (documented clinically or microbiologically) with Grade 3 or 4 neutropenia (absolute neutrophil count 
<1.0 x 109/L) 

Platelets <25 x 109/L 

Clinically significant bleeding attributed to  grade 3 thrombocytopenia or requiring platelet transfusion 

Grade ≥3 oesophagitis onset during induction chemotherapy or within 2 weeks of starting radiotherapy 

Grade ≥3 pneumonitis onset within 3 months of starting radiotherapy 

Grade ≥3 nausea or vomiting not controlled by optimal outpatient anti-emetics 

Grade ≥3 diarrhoea despite optimal outpatient anti-diarrheal medication use 

Other grade 3 ≥ effects thought to be directly treatment related to the combination of M6620 (Berzosertib) with 
chemotherapy or radiotherapy 

Any toxicity causing radiotherapy delivery delay by >3 consecutive fractions 

An elevation of ALT or AST  >5 x ULN lasting 8 days or more 

A concurrent elevation of ALT or AST >3 × ULN and total bilirubin >2 × ULN in whom there is no evidence of 
biliary obstruction or other causes that can reasonably explain the concurrent elevation 

Missing 2 consecutive doses of M6620 (Berzosertib) within a cycle due to Grade ≥3 toxicity 

A delay of any of the 3 treatments of 7 days or more within a cycle due to treatment related toxicity 

Death due to drug related complications 

Cardiac: 
-
QTc prolongation (any QTc interval ≥500 msec or any change in QTc interval ≥60 msec from baseline) on ECG, 
unless related to an electrolyte abnormality and prolongation resolves with correction of electrolyte abnormality 
-
Any of the following (CTCAE criteria): Grade 2 or greater ventricular arrhythmia (second or third degree AV 
block), severe sustained/symptomatic sinus bradycardia less than 45 beats per minute (bpm) or sinus 
tachycardia >120 bpm not due to other causes (e.g., fever), persistent supraventricular arrhythmia (e.g., 


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uncontrolled/new atrial fibrillation, flutter, atrioventricular nodal tachycardia, etc.) lasting more than 24 hours, 
ventricular tachycardia defined as >9 beats in a row or any length of torsades de pointes (polymorphic 
ventricular tachycardia with long QTc), or unexplained recurrent syncope 
-
Symptoms suggestive of congestive heart failure with confirmed Ejection Fraction (EF) <40% (by 2D-
echocardiogram or Multiple Gated Acquisition [MUGA] scan) or a relative decrease >20% from screening 
assessment of EF or if performed within 12 months 
-
Troponin T: level which is consistent with myocardial infarction 
Late DLTs – onset 6 weeks after completion of radiotherapy will be defined as per RTOG/EORTC late toxicity and 
Mellow Dysphagia score (Appendix C, D): 

Grade ≥3 lung and heart toxicity 

Grade 3 oesophageal toxicity with an increase in Mellow score by ≥2 since baseline (need to exclude disease 
progression on CT and/or endoscopy and biopsy) 

Grade 4 oesophageal toxicity 
Notes: 

In the event of a Grade 4 neutropenia, a full blood count must be performed no more than 7 days after the 
onset of the event to determine if a DLT has occurred. Continue to monitor the subject closely until resolution 
to Grade 3 or less. 

In the event of a Grade 3 or higher elevation in ALT or AST, follow-up laboratory assessments should be 
performed every 48 to 72 hours until reduced to Grade 2 or less. 
9.2
Management of treatment toxicities 
In response to a toxicity of unknown or indeterminate causality M6620 (Berzosertib) treatment should be primarily 
withheld followed by chemotherapy. In the case of M6620 (Berzosertib) or chemotherapy toxicity or dose modification 
during the concurrent chemoradiotherapy phase patients should continue with RT where possible. The decision as to 
whether to continue radiotherapy is at the discretion of the treating clinician. If toxicity could be attributable to systemic 
therapy or radiotherapy, systemic therapy should be withheld first (see section 12.8 for management of radiotherapy 
toxicities). 
Appropriate dose modifications should be considered for all agents if grade 3 or 4 toxicity occurs (see section 9.3 and 
9.4 below). In stage A2 dose reductions should not be made beyond 50% of starting dose and the patient should come 
off study if further Grade 3 or 4 non-haematologic toxicity or Grade 4 haematologic toxicity is then experienced. 
9.3
Management of M6620 (Berzosertib) drug toxicities 
No dose modifications of M6620 (Berzosertib) may be made (see 9.3.1 for exception in stage A2 below). Treatment may 
be interrupted because of a non-DLT of Grade 3 or higher, at the discretion of the Investigator.  Treatment may be 
resumed when all toxicities have returned to grade 2 or less, at the discretion of the Investigator. If two consecutive 
doses of M6620 (Berzosertib) within a cycle are missed due to M6620 (Berzosertib) related Grade ≥3 toxicity, this 
constitutes a DLT, and no further M6620 (Berzosertib) will be administered. Missed doses due to ≤Grade 2 events, will 
be classified as non-compliance, not a DLT. A delay of any of the 3 treatments of 7 days or more within a cycle due to 
treatment related toxicity would be considered a DLT. 
If the subject misses a dose of M6620 (Berzosertib) for any reason other than toxicity the dose should not be made up 
and the scheduling should continue as normal, from the next planned dose of M6620 (Berzosertib), unless it is a Tuesday 
dose which can be made up on the following day (Wednesday). If radiotherapy is withheld for toxicity or other reasons, 
M6620 (Berzosertib) should also be withheld and the dosing schedule should continue from the next planned dose once 
radiotherapy has resumed (see also section 8.4). 
In Stage A2, if a patient experiences a DLT, they may continue on trial treatment at the next lowest dose level at the 
discretion of the treating investigator. 
In Stage B, if a patient experiences a DLT, the TMG will convene to decide whether it is appropriate for the patient to 
continue receiving trial treatment, potentially at a reduced frequency of doses.  


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9.3.1
Additional guidance Stage A2 
In stage A2 M6620 (Berzosertib) must not be dose reduced in the first 4 weeks of treatment but doses may be 
omitted for toxicity (as above). The M6620 (Berzosertib) dose may be reduced after the 4 week DLT window is 
complete as follows:  
1. For Grade 4 hematologic toxicity: dose of M6620 (Berzosertib) to be reduced by 25%. 
2. For Grade 3 non-hematologic toxicity: dose of M6620 (Berzosertib) to be reduced by 25%. 
3. For Grade 4 non-hematologic toxicity: dose of M6620 (Berzosertib) to be reduced by 50%. 
If the dose of M6620 (Berzosertib) has already been reduced by 25% a further dose reduction of 25% may be made to 
50% of starting dose. However no further dose reductions may be made beyond 50% of starting dose and the patient 
should come off study if further Grade 3 or 4 non-haematologic toxicity or Grade 4 haematologic toxicity is then 
experienced. 
9.3.2
Toxicities associated with M6620 (Berzosertib) 
Acute hypersensitivity reactions are a toxicity of M6620 (Berzosertib). Serious acute hypersensitivity reactions have 
occurred during the second M6620 (Berzosertib) infusion in approximately 5% of subjects administered M6620 
(Berzosertib) and should be reported as an Serious adverse reaction (see section 8.4 for management of hypersensitivity 
reactions). In at least one sixth of patient reactions at the site of infusion were noted including erythema, swelling, 
pruritus. The most common toxicities reported in patients who have received M6620 (Berzosertib) are: fatigue, 
abdominal pain, diarrhoea, nausea and vomiting, decreased appetite, cough, headache and fever. Almost all instances 
of these toxicities occurred in patients who were also receiving chemotherapy in combination with M6620 (Berzosertib). 
M6620 (Berzosertib) in combination with chemotherapy may exacerbate the risks associated with the chemotherapy. 
The most frequently noted grade ≥ 2 laboratory abnormalities observed (in combination with chemotherapy) are 
neutropenia, low lymphocytes, low haemoglobin and elevated ALT/AST. M6620 (Berzosertib) absorbs UV-visible 
radiation spectrum and is widely distributed including to the skin, so subjects should be cautioned to minimise exposure 
to the sun and other sources of visible and UV radiation and to take protective measures when necessary. Full range of 
toxicities can be found in the M6620 (Berzosertib) IB. 
9.4
Management of chemotherapy toxicities 
Toxicity due to capecitabine or cisplatin administration may be managed by symptomatic treatment and/or modification 
of the dose (treatment interruption or dose reduction) as per standard of care.  Once the dose has been reduced, it 
should not be increased at a later time.  Patients taking capecitabine should be informed of the need to interrupt 
treatment immediately if moderate or worse toxicity occurs.  Detailed information can be found in the product SPCs 
available from www.medicines.org.uk . 
9.4.1
Haematological toxicity  
Myelosuppression is uncommonly observed with cisplatin and capecitabine. Neutropaenia and thrombocytopaenia 
should be monitored according to the recommended protocol and appropriate dose modifications made. Anaemia may 
occur cumulatively with cisplatin and should be corrected during radiotherapy to maintain the haemoglobin ≥10g/dL. 
The FBC should be taken and reviewed (up to 3 days) prior to Day 1 of each cycle of chemotherapy.  
Dose modification for haematological toxicities 
Neutrophil / platelet count (109/L) 
(day 1 of subsequent cycles) 
Action 
ANC ≥ 1 and/or plts ≥ 75 
Full dose drugs 
ANC 0.5- <1 and/or plts 50- <75 OR any episode of 
neutropenic sepsis during the previous cycle 
Stop chemotherapy until recovery. 
Restart with 25% dose reduction cisplatin and capecitabine  
ANC <0.5 and/or plts <50 
Stop chemotherapy until recovery.  
Restart with 50% dose reduction cisplatin and capecitabine  


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9.4.2
Non-haematological toxicity 
Gastrointestinal toxicity:
Nausea and vomiting is common following cisplatin, usually starting within 1 hour of treatment and lasting up to 24 
hours. Anorexia, nausea and occasional vomiting may persist for up to one week. Nausea occurs less commonly with 
capecitabine (Diarrhoea occurs with capecitabine and patients should receive advice regarding discontinuation of 
therapy and use of loperamide or codeine phosphate). Clinicians should be aware of infective causes of diarrhoea (e.g. 
Clostridium difficile), and patients should be tested in cases of concern. Antibiotic treatment is not recommended 
routinely but may be required in such circumstances. Stomatitis occurs with capecitabine and patients should receive 
advice regarding good oral care, and the use of mouthwash (e.g. Corsodyl™). 
Anaphylaxis: Reactions to cisplatin therapy have been occasionally reported in patients who were previously exposed 
to cisplatin. Patients who are particularly at risk are those with a prior history or family history of atopy. Serious reactions 
may be controlled by IV adrenaline, corticosteroids or antihistamines.  
Serum 
Electrolyte 
Disturbances: 
Hypomagnesaemia, 
hypocalcaemia, 
hyponatraemia, 
hypokalaemia 
and 
hypophosphataemia have been reported to occur in patients treated with cisplatin and hypomagnesemia may occur 
and should be monitored according to the protocol.  
Other Toxicities: Hair loss is not expected with this combination but may rarely occur with most chemotherapeutic 
agents. Vascular toxicities coincident with the use of cisplatin in combination with other antineoplastic agents have 
been reported rarely. These events may include myocardial infarction, cerebrovascular accident, thrombotic 
microangiopathy (haemolytic uraemic syndrome) or cerebral arteritis. There have been reports of optic neuritis, 
papilloedema and cerebral blindness following treatment with cisplatin.  
Non-haematological 
toxicity 
dose 
reductions 
for 
Capecitabine 
and 
Cisplatin Toxicity
During a course of therapy – Cisplatin and 
Capecitabine 
Dose adjustment for next cycle (% of 
starting dose) 
Grade 1 
Maintain dose level for both drugs 
100% Cisplatin & Capecitabine 
Grade 2 
1st appearance 
Interrupt until resolved to grade 0-1 
100% Cisplatin & Capecitabine 
2nd appearance 
Interrupt until resolved to grade 0-1 
75% Cisplatin & Capecitabine 
3rd appearance 
Interrupt until resolved to grade 0-1 
50% Cisplatin & Capecitabine 
Grade 3 
1st appearance 
Interrupt until resolved to grade 0-1 
75% Cisplatin & Capecitabine 
2nd appearance 
Interrupt until resolved to grade 0-1 
50% Cisplatin & Capecitabine 
3rd appearance  
Discontinue treatment permanently 
Grade 4 
1st appearance 
Discontinue permanently 
Or
If physician deems it to be in the patient’s best 
interest to continue, interrupt until resolved to 
grade 
0-1 
after 
discussion 
with 
Chief 
Investigator 
50% Cisplatin & Capecitabine 
9.4.3
Additional capecitabine toxicities 
The following are the recommended dose modifications for toxicity. In addition patients should receive loperamide in 
case of diarrhoea and mouthwashes and anti-emetics according to local policy. Toxicities should be graded according 
to CTCAE v4.03. In particular, diarrhoea, nausea, vomiting, stomatitis and skin reactions are to be noted. Please use the 


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alternative specific toxicity for Hand-foot syndrome (PPE), the frequency of which in patients receiving capecitabine has 
led to altered toxicity ratings.
Nephrotoxicity 
GFR (mls/min) Baseline and prior to Day 1 
Capecitabine dose 
≥ 50ml/min 
100% 
30-49 ml/min 
75% 
< 30ml/min 
This group of patients should be withdrawn from trial treatment 
(please complete withdrawal form at Level 1) and treated according 
to local investigator choice and continue to complete CRFs 
Grade of  
hand-foot syndrome
1 
Numbness, dysaesthesia/paraesthesia, tingling, painless swelling or erythema of the hands 
and/or feet and/or discomfort which does not disrupt the patient's normal activities.
2 
Painful erythema and swelling of the hands and/or feet and/or discomfort affecting the 
patient's activities of daily living.  
3 
Moist desquamation, ulceration, blistering and severe pain of the hands and/or feet and/or 
severe discomfort that causes the patient to be unable to work or perform activities of 
daily living. 
If grade 2 or 3 hand-foot syndrome occurs, administration of capecitabine should be interrupted until the event resolves 
or decreases in intensity to grade 1. Following grade 3 hand-foot syndrome, subsequent doses of capecitabine should 
be decreased. 
Chest pain 
For patients with a history of angina please ensure they have GTN spray at home and remain on their cardiac medication.  
If unexplained chest pain occurs on treatment, capecitabine should be stopped, an ECG performed and cardiac enzymes 
measured. In the case of angina or myocardial infarction being confirmed this should be managed according to usual 
local practice. Patients should not recommence capecitabine therapy and further therapy should be discussed with the 
Chief Investigator. Such cardiac toxicity should be reported through a SAE form. 
Hepatotoxicity 
Isolated elevation of serum transaminases may be related to capecitabine and will not require dose interruption unless 
AST/ALT levels are ≥ 5 times ULN. If AST/ALT is above this level, capecitabine will be interrupted till it returns to ≤ 2.5 
times ULN. 
DPD deficiency 
If a patient has not received capecitabine in the past DPD testing should be undertaken as per institutional protocol. 
Patients with partial or full DPD deficiency are not eligible for the study. 
Occasionally (approximately 1-3%) a patient may have a markedly exaggerated toxicity due to reduced 5FU catabolism. 
If this occurs, await full recovery of toxicities. Further treatment should be discussed with the Chief Investigator or one 
of the clinical co-investigators.  
9.4.4
Additional Cisplatin toxicities 
Nephrotoxicity 
Cisplatin produces cumulative nephrotoxicity. If a baseline estimate of renal function using the Cockroft & Gault formula 
predicts the GFR to be ≥ 60mL/min full dose cisplatin should be used. If the estimate is <60mls/min a formal measure 
of Creatinine clearance should be performed (EDTA or 24 hour urine test) and the appropriate cisplatin dose used (see 
table below). In the case of a 25% deterioration in estimated renal function (using the Cockroft & Gault formula) on pre-


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treatment blood samples a formal Creatinine clearance test should be performed and pending this an appropriate dose 
reduction in cisplatin should be made. The formal Creatinine clearance result, when available, takes precedent over 
estimated GFR for subsequent cisplatin dose calculations.  
GFR (mls/min) Baseline and prior to Day 1 
Cisplatin Dose 
≥ 60ml/min 
100% 
45-59ml/min 
50% 
30-44 ml/min 
Stop Cisplatin. This group of patients if in dose level 1 should be 
withdrawn from trial treatment (please complete withdrawal form at 
Level 1) and treated according to local investigator choice and 
continue to complete CRFs. 
< 30ml/min 
This group of patients should be withdrawn from trial treatment 
(please complete withdrawal form at Level 1) and treated according 
to local investigator choice and continue to complete CRFs 
Neurotoxicity/ototoxicity 
Neurotoxicity/ototoxicity appears to be cumulative. Prior to each course, any new or progressive symptoms of 
peripheral neuropathy should be established. 
10
OTHER TREATMENTS (NON-IMPS) 
10.1
Background systemic therapy 
The chemotherapy agents cisplatin and capecitabine are not licensed for use in oesophageal cancer but are used as the 
standard treatment for oesophageal cancer in the UK. Details of dose administration and toxicity management can be 
found in the SPC, standard practices and policies apply throughout (Stage B). However, cisplatin and capecitabine are 
not considered standard practice in stage A2 & B therefore these drugs are considered IMPs for the purpose of this trial. 
10.2
Support medication 
Pre-medication and supportive medication should be given as per local practice. 
10.3
Concomitant medication and non-drug therapies 
Concomitant medication may be given as medically indicated.  All patients will be asked to provide a complete list of 
prescription and over-the-counter medications that have been taken within the previous 4 weeks prior to the first 
treatment visit.  They must also inform the Investigator about any new medication started while in the trial. Details 
(including indication, doses, frequency and start / stop dates) of concomitant medication taken during the trial until the 
completion of the off-study visit must be recorded in the medical record and the appropriate CRF. 
10.4
Prohibited therapies 
Patients should not be prescribed any other anti-cancer or investigational therapies while participating in this study. In 
addition, the following should be noted. 

Radiation therapy is permitted as per schedule.

Oesophageal stent is not permitted.

Live vaccine is not permitted within 30 days prior to treatment start, for the duration of trial treatment and for 
6 weeks after the last administration of IMP dose.
10.5
Potential Drug Interactions 
10.5.1
M6620 (Berzosertib) 
Drug interaction profile of M6620 (Berzosertib) has not been fully characterised, caution should be used when co-
administering medications with M6620 (Berzosertib). Based on its mechanism of action, M6620 (Berzosertib) may 
increase the frequency or severity of adverse reactions associated with cisplatin. 


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As M6620 (Berzosertib) is primarily metabolised by CYP3A4, concomitant administration with potent inhibitors or 
potent inducers of CYP3A4 should be avoided. Up to 14 days prior to receiving study drug and through the duration of 
the study, the following list of potent CYP3A4 inhibitors or inducers should be avoided. Please note that the following 
list is not exhaustive: 
Potent CYP3A4 inhibitors: Clarithromycin, itraconazole, ketoconazole, mibefradil, hepatitis C virus and HIV protease 
inhibitors, nefazodone, posaconazole, telithromycin, voriconazole 
Potent CYP3A4 inducers: carbamazepine, rifampicin, rifapentine, phenobarbital, phenytoin, primidone, St John’s wort 
Grapefruit/grapefruit juice, Seville or blood oranges or marmalade – none allowed within 14 days before first dose or 
during treatment period with M6620 (Berzosertib). 
Haemopoetic growth factors - none allowed within 14 days before first dose or prophylactic use with cycle 1.  
10.5.2
Capecitabine and Cisplatin 
Capecitabine and Cisplatin interact with several medications and the following precautions should be followed: 
Drugs to be avoided: 

Cumulative nephrotoxicity may be potentiated by aminoglycoside antibiotics e.g. gentamicin. These should not 
be administered, if possible, simultaneously or 1-2 weeks after treatment with Cisplatin  

Thymine antivirals and analogues, including Brivudine (would require a 4-week wash out prior to entering in 
the trial) 

Methotrexate, Bleomycin - Reduce renal excretion of bleomycin and methotrexate which increases their 
toxicity 

Anti-gout agents (like allopurinol, colchicine, probenecid or sulfinpyrazone) - reduce the efficacy of 
Capecitabine 

Warfarin - Coumarin derivative anticoagulants (like warfarin) require more frequent monitoring due to altered 
coagulation parameters, and effects may occur up to several months after initiating Capecitabine therapy.  A 
low molecular weight heparin can be used as a replacement during trial treatment. 
The following drugs may require dose modification:  

Ototoxic drugs like aminoglycoside antibiotics or loop diuretics (e.g. furosemide), may increase ototoxic 
potential of Cisplatin. 

Anti-epileptics; the serum level of phenytoin may be reduced and levels should be monitored and the dose 
adjusted accordingly - may increase Capecitabine levels 

Folic acid/folinic acid – reduces maximum tolerated dose and may increase Capecitabine toxicity 

Aluminium hydroxide or magnesium hydroxide containing antacids – increase plasma concentrations of 
Capecitabine and its metabolite 5DFCR (5’-deoxy-5-flurocytidine) 

Interferon alpha – reduces maximum tolerates dose of Capecitabine 

Cytochrome p450 down regulation by Capecitabine may affect the following class of drugs – angiotensin II 
blockers (losartan, valsartan); oral hypoglycaemic agents (glipizide, tolbutamide, rosiglitazone); NSAIDS 
(indomethacin, celecoxib, diclofenac, ibuprofen) 
Please note that the above contraindications are not exhaustive and investigators should refer to the SPC for full 
guidance www.medicines.org.uk. 
11
DRUG MANAGEMENT 
All details regarding M6620 (Berzosertib) packaging, labelling and dispensing will be included in the Pharmacy Manual. 
Cisplatin and capecitabine should be managed as per local policies and procedures. 


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11.1
Drug supplies 
11.1.1
M6620 (Berzosertib) 
M6620 (Berzosertib) will be supplied by MERCK KGAA, DARMSTADT GERMANY in 10ml vials of a 20mg/ml solution for 
infusion. MERCK KGAA, DARMSTADT GERMANY will ship drug to Fisher Clinical Services where it will be labelled 
according to applicable regulatory requirements and QP released.  
11.1.2
Capecitabine and cisplatin  
Cisplatin as a solution for injection and capecitabine as a tablet for oral use should be supplied from trial site’s own 
stock and funded locally.  
11.2
Drug ordering 
Initial supplies of M6620 (Berzosertib) are sent out by Fisher Clinical Services after they have been informed by the Trial 
Office that all approvals are in place. Subsequent supplies will be ordered by the Trial office. Pharmacy should request 
additional shipments of M6620 (Berzosertib) using the drug order form provided. Email the completed form to the Trial 
Office  
(octo-CHARIOT@oncology.ox.ac.uk).  
Pharmacy is responsible for monitoring the M6620 (Berzosertib) stock and re-ordering when required. Complete drug 
orders received by the Trial Office before 4pm will arrive at the Pharmacy within 10 working days. 
If a vial of M6620 (Berzosertib) is accidentally destroyed or damaged, i.e. by dropping the vial, damaged packaging or 
through contamination, the pharmacist should contact the Trial Office for replacement. 
11.3
IMP Receipt 
A copy of each M6620 (Berzosertib) delivery note and temperature monitoring form should be scanned and emailed as 
a PDF attachment to octo-CHARIOT@oncology.ox.ac.uk. The original should be kept in the Pharmacy File. If supplies 
are damaged on arrival contact the Trial Office. Damaged supplies should be destroyed on site and a Drug Destruction 
Log completed. 
11.4
Handling and storage 
11.4.1
M6620 (Berzosertib) 
Unopened vials of single use sterile light protected M6620 (Berzosertib) should be stored at controlled room 
temperature (15oC to 30oC). It should be retained in the original package to protect from light. Shelf life as instructed 
on packaging. Following the preparation of diluted M6620 (Berzosertib), intravenous bags should be covered to protect 
from light and stored in the dark.  
The Investigator or an authorised designee will ensure that all the investigational products are stored in a secured area, 
under recommended storage conditions and in accordance with applicable regulatory requirements. To ensure 
adequate records, all study drugs will be accounted for via drug accountability forms as instructed by the Trial Office. 
11.4.2
Capecitabine and cisplatin 
Will be handled and stored as per the local practice. 
11.5
Labelling 
Ensure the phrase “Keep out of reach of children” is used on all medications. 
11.5.1
M6620 (Berzosertib) 
A 20mg/mL (10mL total volume) M6620 (Berzosertib) sterile solution will be supplied by Merck KGaA, Darmstadt 
Germany. The responsible Pharmacy will ensure that IMP supplies dispensed for trial use are appropriately labelled as 
per local practice for infusions in accordance with all applicable regulatory requirements.  
11.5.2
Capecitabine and cisplatin: 
Labelling will be as per local practice. 


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11.6
Dosing and dispensing 
11.6.1
M6620 (Berzosertib) 
M6620 (Berzosertib) will be supplied as 20 mg/mL M6620 (Berzosertib) (in betadex sulfobutyl ether and acetate buffer) 
to be diluted in Glucose 5% IV infusion before intravenous infusion. M6620 (Berzosertib) solution will be constituted 
into the individual dosing containers by a qualified member of pharmacy staff. Details of dose preparation will be 
provided in the Pharmacy Manual (see Formulation Preparation Instructions). 
M6620 (Berzosertib) will be administered intravenously over 60 minutes (±10 minutes). When the total volume of 
infusion exceeds 600mL, the infusion may be extended beyond 60 minutes (as tolerated), but no more than 90 minutes.  
11.6.2
Cisplatin and capecitabine 
Refer to the Summary of Products Characteristics (SPC) for full prescribing information and details of drug 
reconstitution, administration and stability (http://www.medicines.org.uk/emc/). Mannitol may be given concurrently 
with cisplatin or may be given as a short infusion according to local policy.  
11.7
Drug accountability 
Drug accountability is the responsibility of the site pharmacist listed on the trial delegation log. Full drug accountability 
records must be maintained for M6620 (Berzosertib), cisplatin and capecitabine. Hospitals may amend the Drug 
Accountability Logs provided or use their own documentation if it captures all the information requested on the Drug 
Accountability Logs and has been approved by the Trial Office in advance. 
At the conclusion of the study the overall numbers of drug shipped to the centre, the number dispensed and the number 
destroyed or returned will be provided by the pharmacy. An account must be given of any discrepancy.  
11.8
Drug destruction 
Chemotherapy drugs will be disposed of as per local hospital policy. Disposal of M6620 (Berzosertib) will be according 
to the table below.  
Used / partially used vials 
Disposal at site according to local hospital policy. 
Patient returns (Capecitabine only) 
Disposal at site according to local hospital policy. 
Documented on Drug Accountability Log 
Expired drug 
Any expired drug should be disposed of at site according to local 
hospital policy. A Drug Destruction Log should be completed.  
Drug left unused 
Once authorised to do so, any unused drug should be disposed of 
at site according to local hospital policy. A Drug Destruction Log 
should be completed.  
The original drug destruction logs should be placed in the Pharmacy File and a copy scanned and emailed to  
octo-CHARIOT@oncology.ox.ac.uk. 
11.9
Occupational safety 
Vein extravasation and accidental spillages should be dealt with according to hospital policy. The product is not expected 
to pose an occupational safety risk to site staff under normal conditions of use and administration. 
12
RADIOTHERAPY (OR CHEMORADIOTHERAPY) 
12.1
Dose prescription and fractionation 
It is highly recommended that the radiotherapy will be delivered in a single phase, treating each field daily Monday to 
Friday and prescribed and recorded as per ICRU 50/62. Conformal radiotherapy with a pixel based inhomogeneity 
correction is essential. Photon energy should be between 6MV and 10MV (energies in excess of 10MV should only be 
used in exceptional cases due to secondary build-up depth.  


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Stage A1 
Patients recruited to Stage A1 of CHARIOT will receive a planned single-phase treatment delivered with IMRT. If IMRT 
is not possible then a 3D Conformal approach (meeting the required constraints) should be used. The total dose of 
radiation will be 35Gy in 15 fractions treating once daily, 5 days a week Monday to Friday and prescribed and recorded 
as per ICRU 62. 
Stage B 
Patients recruited to Stage B of CHARIOT should have a single phase inverse-planned IMRT treatment plan produced 
and treatment delivered with multiple field static or rotational fields. 
The total dose of radiation will be 50Gy in 25 fractions treating once daily, 5 days per week Monday to Friday and 
prescribed and recorded as per ICRU 62.  
12.2
Radiotherapy localisation 
A contrast enhanced CT (CECT) and depending on the tumour location, this will be followed by 4DCT in treatment 
position, i.e. supine with their arms above their heads, must be acquired for RT planning. The 4DCT is not mandated for 
Stage A and imaging will be done as per local policy.  Intravenous contrast should be used (providing adequate renal 
function), to help distinguish the GTV from surrounding tissues; but oral contrast should not be used as it is not helpful 
in most cases and may interfere with planning calculations. To enable accurate assessment of the doses to organs at 
risk (OAR) the scan should extend superiorly to at least one CT slice above the apices of the lungs and inferiorly to the 
iliac crest (L2). Scans for upper third tumours may need to extend superiorly to the tragus. 
For Stage B, the planning scan should be performed as per local guidelines ideally within 2 weeks of starting the 
neoadjuvant phase of chemotherapy. CT slice thickness should be no greater than 3mm. It is recommended that all 
patients have a CT scan of the thorax, abdomen and pelvis and an endoscopic ultrasound (EUS), noting the full extent 
of the disease with reference to anatomical landmarks. PET has an established role in the UK in terms of staging 
oesophageal cancer and can be useful in determining the extent of the disease, but the volume as defined by CT and 
EUS should not be reduced based on PET findings alone. 
12.3
Target volume definition (TVD) 
Patients will be divided into two separate groups according to the location of the centre of the primary tumour: 
a) Proximal tumours (tumours of upper and middle 1/3 oesophagus) defined here as primary tumour whose midpoint 
is above 32cm ab oral (NB proximal extent of primary being below 15cm is an eligibility criteria). 
b) Distal tumours (tumours of distal 1/3 of oesophagus and gastro-oesophageal junction (GOJ)), defined here as being 
eligible patients with tumours whose midpoint is below 32cm ab oral (NB distal extent of primary being less than 2cm 
from the GOJ is an eligibility criteria). 
This distinction accounts for the need to manually outline the elective nodal regions below the GOJ for the distal 
tumours. There is also significant movement in this region due to respiration requiring a larger PTV margin. Where 
possible, the centres are encouraged to use 4DCT planning scans for distal tumours. 
Targets are defined following the principles of ICRU 50 and 62.  The target volumes are localised on axial slices of the 
planning 3DCT or 4DCT scan.   
Stage A1 - All tumours 
Volume 
Description 
GTV 
Consists of the primary tumour and involved nodes deemed treatable and the circumference 
of the oesophagus at the level of disease. GTV definition is aided by information from EUS, 
diagnostic spiral CT scan, barium studies and 18-FDG PET scan if available.   Encompass 
‘tumour’ seen on the planning CT even if outside the EUS defined disease extent i.e. the GTV 
should be the most proximal and distal extension of disease as seen on EUS or CT scan.  The 
lateral and anterior-posterior GTV margins are derived from the planning CT scan. 
CTVA 
GTV is copied and labelled ‘CTVA’ and is grown manually to include the circumference of the 
oesophagus superiorly and inferiorly. The superior-inferior margin of CTVA will be 10mm from 
the edges of GTV. 
CTVB 
CTVA is copied and labelled ‘CTVB’. It is grown by adding 10mm in right-left and anterior-
posterior directions using the Treatment Planning System (TPS).  


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PTV 
CTVB is copied and labelled ‘PTV’ and is grown by adding 10mm in the superior – inferior and 
7 mm circumferentially using the TPS (2mm Internal Margin, IM and 5mm Setup Margin, SM). 
Stage B - Proximal tumours 
Volume 
Description 
GTVp 
Consists of the primary tumour and the circumference of the oesophagus at the level of disease. GTV 
definition is aided by information from EUS, diagnostic spiral CT scan, barium studies and 18-FDG PET 
scan.   Encompass ‘tumour’ seen on the planning CT even if outside the EUS defined disease extent i.e. 
the GTV should be the most proximal and distal extension of disease as seen on EUS or CT scan.  The 
lateral and anterior-posterior GTV margins are derived from the planning CT scan. 
GTVn 
Consists of involved nodes not in continuity with the tumour. These should be outlined separately and 
named separately e.g. GTVn1, GTVn2 etc. where more than one GTVn exist.  Only the node should be 
outlined – it is not required to include the full circumference of the oesophagus.   
GTVpn 
Combine GTVp and all GTVn and the circumference of the intervening oesophagus. 
CTVA 
GTVp +  20mm sup-inf (manually grown along direction of oesophagus) OR GTVn + 10mm superior-
inferior margin (If GTVn is more proximal/distal than GTVp). 
CTVB 
CTVB = CTVA + 10mm circumferentially (but not superior-inferior), edited for normal structures but NOT 
beyond  CTVC. Normal structures include lung, pericardium, large vessels, trachea, right and left main 
bronchi, liver and the vertebrae, both above and below the diaphragm. 
CTVC 
CTVA + 5mm circumferentially (but not superior-inferior) – this is the minimum expansion around CTVA 
and is respected when CTVB is edited. 
PTV 
CTVB is copied and labelled ‘PTV’ and is grown by adding 10mm in the superior – inferior and 7 mm 
circumferentially using the TPS (2mm Internal Margin, IM and 5mm Setup Margin, SM). Posteriorly this 
margin may be reduced if the PTV extends across the vertebrae by more than 5mm as the margin for 
internal movement is not required as tumour cannot move into vertebrae and only setup margin is 
required.
Stage B - Distal tumours (3DCT) 
Volume 
Description 
GTVp 
As for proximal tumour 
GTVn 
As for proximal tumour 
CTVA 
GTVp is copied and labelled ‘CTVA’ and is grown manually to include the circumference of the oesophagus 
superiorly and inferiorly by 20mm. 
CTVN 
GTVn is coped and labelled ‘CTVn’ and is grown by a 5mm margin in all directions (for multiple nodes, 
label CTVn1, CTVn2 etc). This defines a minimum margin around positive nodes to assist in the delineation 
of CTVB. 
CTVB 
CTVA is copied and labelled ‘CTVB’. It is grown by adding 10mm in right-left and anterior-posterior 
directions using the Treatment Planning System. CTVB is edited to exclude lung, pericardium, large 
vessels and the vertebrae. CTVA is copied and labelled CTVC. It is grown by adding 5 mm circumferential, 
this contour is then combined with CTVB to create CTVB1. Below the GOJ CTVB1 is grown manually to 
include the volume at risk to a total of 20mm below GTVp and at least 10mm below lowest GTVn. 
Therefore this volume should include CTVn and the elective nodal regions at high risk of microscopic 
spread (lymph node stations along the lesser curve to include the para-cardial, and left gastric lymph 
nodes along the lesser curve of the stomach).  
PTV 
CTVB1 is copied and labelled ‘PTV’ and grown 10mm superiorly and 7 mm circumferentially (2mm IM + 
5mm SM) and 15mm inferiorly (10mm IM + 5mm SM) using the TPS. Posteriorly this margin may be 
reduced if the PTV extends across the vertebrae by more than 5mm as the margin for internal movement 
is not required as tumour cannot move into vertebrae and only setup margin is required. 


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Distal tumours (4DCT) 
The principle involved in 4D planning is to account for intra-fraction motion and therefore generate patient specific 
volumes.  It is expected that sites will have detailed local guidance for acquisition and outlining on 4D dataset, which 
has been accredited as part of previous trial involvement. Briefly, GTVp. GTVn, CTVA and CTVB contours are generated 
(as per the distal tumour 3DCT protocol above) on the Maximum Inhalation scan, Maximum Exhalation scan and 
Reference scan of the 4DCT dataset resulting in the following volumes: 
Maximum inhalation scan - GTVp_MaxIn, GTVn_MaxIn, CTVA_MaxIn, CTVB_MaxIn 
Maximum exhalation scan – GTVp_MaxEx,  GTVn_MaxEx, CTVA_MaxEx, CTVB_MaxEx 
Reference scan - GTVp_Ref, GTVn_Ref,  CTVA_Ref, CTVB_Ref 
ITV is derived by combining CTV_MaxIn, CTVB_MaxEx and CTVB_Ref as the composite CTVB volumes, edited to account 
for any additional motion seen from all other 4DCT phases (i.e. the editing will result in the ITV only being made bigger, 
to account for the maximum extent of these motion effects).   The above contours must be associated with the reference 
dataset.  
PTV = ITV + SM = ITV + 5mm 
Set up margin (SM) is applied for treatment inaccuracies, such as set up error, and for the purpose of this protocol ITV 
is grown by 5mm in all directions using the TPS. Following the generation of the PTV, outlining of the organs at risk 
structures and planning should be carried out on the reference data set only. Maximum length of PTV for Stage B = 
15cm
12.4
Organs at risk 
The organs at risk (OARs) that must be contoured for CHARIOT and the naming convention used in naming these 
structures are detailed below. The spinal cord should be outlined on slices which include or are within 20mm of the PTV 
in the superior and inferior directions and a Planning Risk Volume (PRV) for the cord is created to account for positioning 
error. The full extent of the right and left lungs are outlined, this should be done in such a way that the planning system 
will be able to calculate a combined lung dose volume histogram (DVH). The whole heart is outlined to the extent of the 
pericardial sac (if visible). The major blood vessels (superior to the organ) and the inferior vena cava (towards the inferior 
extent of the heart) are excluded. The whole liver is outlined if the level of its superior edge overlaps with the level of 
the inferior extent of the PTV. Each kidney is outlined separately if the level of its superior edge overlaps with the level 
of the inferior extent of the PTV. The whole stomach should be outlined in such a way that a stomach DVH can be 
produced 
12.5
Treatment Plan Optimisation  
A single phase IMRT plan (or equivalent if using 3D Conformal approach) should be produced for patients treated in 
Stage A1 and an inverse-planned IMRT treatment plan should be produced for patients treated in Stage B.  Type B 
algorithms (e.g., collapsed cone, AAA) must be used for dose calculation.   
12.6
Dose constraints 
Stage A1 
All constraints corrected using the linear quadratic equation and are valid only for 35Gy/15# and should not be 
corrected 
Structure 
Naming convention* 
DVH constraint 
PTV 
PTV 
D99% > 95% 
V95% > 99% 
ICRU Maximum Dose 
Please label patient outline as “External” 
D1.8cc < 107% 
Spinal Cord PRV 
SpinalCord_PRV 
None 
Heart 
Heart 
Dmean < 23Gy 
V28Gy < 45% 
Combined lungs 
Lungs 
Dmean < 15Gy 
V18Gy < 25% 
Stomach 
Stomach 
None 
Liver 
Liver 
Dmean < 26Gy 
V28Gy<30% 
Individual kidneys 
Kidney_L and Kidney_R 
V18Gy < 25% 


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Stage B: 
The following dose objectives (Warren et al., 2014) and nomenclature (Santanam et al., 2012) should be used: 
Structure name 
Constraint 
Optimal
Mandatory 
PTV 
V95% 
(47.5Gy) 
Dmedian 
> 95% 
100%  
≥ 90% 
The median should be between 98-102% of the prescription 
dose. 
External 
D1.8cc 
<107% of highest prescribed dose 
SpinalCord_PRV 
D0.1cc 
< 40Gy 
< 42 Gy 
Heart 
Dmean 
V30Gy 
< 25Gy 
< 45%
<30Gy 
- 
Lungs 
(Combined lungs) 
Dmean 
V20Gy 
< 17Gy 
< 20% 
<19Gy 
≤25%
Stomach_excl_PTV 
(Stomach excluding 
PTV) 
V50Gy
< 16cc 
< 25cc
Liver 
Dmean 
V30Gy 
≤28Gy 
< 30% 
≤30Gy 
- 
Kidney_L and Kidney_R 
(Individual kidneys) 
V20Gy 
< 25% 
≤30%
12.7
Treatment delivery and verification 
The treatment should be delivered in a single IMRT (or 3D Conformal approach in Stage A1 only) given the target volume 
described and the normal tissue constraints above, it is up to the individual participating centre to decide the field 
arrangements. It is recommended that the best available positional verification methods should be used to ensure 
correct delivery.  
Stage A1 
The use of cone beam CT matched to planning CT scans is recommended. The minimum on-treatment verification is for 
imaging the initial three fractions so that a correction for systematic error can be applied and then continue with weekly 
imaging. The isocentre should be moved if disagreement is seen in excess of agreed tolerance levels based on local 
study – typically 5mm. 
Stage B 
The use of cone beam CT matched to planning CT scans is mandated.  
The minimum protocol for verification is on-line imaging of the initial five fractions so that a correction for systematic 
error can be applied and then continue with minimum weekly imaging thereafter for Stage B patients. The isocentre 
should be moved if disagreement is seen in excess of agreed tolerance levels based on local study – typically 5mm. 
12.8
Management of radiotherapy toxicity 
Radiotherapy interruptions will usually not be necessary. However, if radiation is held for any reason, all systemic 
therapy must also be held, including M6620 (Berzosertib). Interruptions may be kept to a minimum by the use of 
ancillary therapy and vigorous nutritional support. Interruptions are permitted only on the basis of toxicity. However, 
if the RT interruptions are due to either technical reasons or due to bank holidays, the schedule should be made up to 
account for this either on a Saturday or at the end of the treatment. 


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Toxicity 
Radiotherapy treatment interruption required: 
Restart radiotherapy: 
Oesophagitis 
Grade 4; see management of symptoms below. Aim to 
limit interruption to 3 treatment days (fractions). 
Haematological toxicity 
Neutrophils 
Stop RT treatment if neutrophils <0.5 x 109/L or 
platelet count <25 x 109/L and monitor every 48 
hours.  
Note: systemic therapy should be interrupted initially 
as per local policy.  
If levels recover to 0.5 x 109/L 
(neutrophils) and 25 x 109/L 
(platelets) 
Platelets 
Non-Haematological toxicity 
All toxicities 
Grade 3: stop systemic treatment first and aggressive management should be pursued as per 
protocol, if no recovery to ≤grade 2 within 48h, consider withholding radiotherapy as follows: 
Vomiting 
≥6 episodes of vomiting (≥ grade 3) lasting ≥ 3 days 
and unresponsive to antiemetics 
Resolves to ≤ grade 2 
Diarrhoea 
An increase from a patients usual bowel habit of ≥ 7 
watery stools/day (≥ grade 3) and unresponsive to 
antidiarrhoeals 
Resolves to ≤ grade 2 
Weight loss 
Loss ≥ 10% (≥ grade 2) of pre-treatment weight 
Other1 
Grade 3: withhold radiotherapy and chemotherapy 
Resolves to ≤ grade 2 
1Rarely, non-treatment related or unexpected toxicities may require interruption of therapy at the discretion of the 
treating oncologist. Interruption of therapy may continue until the toxicity has regressed to ≤grade 2 to allow 
resumption of therapy; however, every effort should be made to limit treatment interruptions to 1-2 weeks 
Oesophagitis 
If Grade 4 oesophagitis occurs, and a treatment interruption is being considered, every effort should be made to limit 
it to 3 treatment days or less. Patients requiring hospitalization because of oesophagitis may have their treatment 
interrupted. Acute oesophageal toxicity, which typically can occur within 2 weeks of the initiation of treatment and 
manifests as dysphagia, odynophagia, reflux symptoms, etc. should be pharmacologically managed with the following 
approach and should be initiated at the first signs or symptoms of oesophageal toxicity. Double PPI dose or start PPI, 
soluble paracetamol, oramorph, fluconazole and follow local policy. If a patient develops grade 3 oesophagitis in the 
last week of treatment (i.e., with 5 or fewer radiation treatments remaining), radiation therapy (but not chemotherapy) 
may continue at the discretion of the treating physician. 
If interruption of therapy (< 2 weeks) becomes necessary, radiation therapy should be completed to the prescribed 
doses. If treatment restarts and there are week-ends left aim to compensate for days lost with treatment Saturdays. No 
BID fractionation is permitted. 
Total number of fractions and elapsed days should be carefully reported. If an interruption of more than 2 weeks is 
necessary, resumption of treatment is at the discretion of CI. The patient’s treatment plan will be considered a major 
deviation, but follow-up will be continued. Any toxicity that requires a dose reduction must be documented in the 
patient notes. 
12.9
The management of unscheduled gaps in radiotherapy treatment 
In the event of unscheduled gaps to radiotherapy treatment, these should be managed as described above (section 
12.8) 
CHARIOT patients should be managed as Category 1 patients in Stage B and Category 3 in stage A. 
Where possible during concurrent chemoradiotherapy phase patients should continue with RT if unable to tolerate 
chemotherapy in Stage B. Patients should be withdrawn from trial if RT is delayed by greater than 2 weeks. 


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12.10 Radiotherapy quality assurance
In the first instance, any queries regarding radiotherapy quality assurance for CHARIOT should be addressed to the 
national Radiotherapy Trials QA group (RTTQA) contact (CHARIOT.RTTQA@wales.nhs.uk or www.rttrialsqa.org.uk). 
Centres accredited for SCOPE2 can take part in the trial with no further pre-trial QA required, as these centres will have 
already completed an outlining and planning exercise, and submitted a process document for review by RTTQA. 
Real time review of all patients will not be required instead there will be timely retrospective review of radiotherapy 
plans in the event of any unexpected or severe toxicity. All images, outlines, plan and dose data (DICOM) should be 
submitted to the RTTQA contact who will co-ordinate review of the data to check protocol compliance.  
13
EVALUATION OF RESPONSE 
13.1
Tumour assessment 
A clinical and radiological evaluation of malignancy, as judged appropriate by the Investigator, and in line with the 
protocol, must be performed before starting the study treatment where applicable.  The same methods that detect 
lesions at baseline will be used to follow these lesions throughout the study.  To ensure compatibility, the radiological 
assessments used to assess response must be performed using identical techniques.  Imaging based evaluation is 
preferred to evaluation by clinical examination when both methods have been used to assess the anti-tumour effect of 
a treatment. 
Baseline evaluations 
These will include radiological measurements of the extent of disease by CT scan or PET-CT scans and endoscopy will 
also be performed.  All areas of disease present must be mentioned (even if specific lesions are not going to be followed 
for response) and the measurements of all measurable lesions must be recorded on the scan reports.  Any non-
measurable lesions must be stated as being present.   
Evaluations during treatment and at off-study 
Tumour assessment will be repeated as per the schedule of events given or more frequently if clinically indicated.  All 
lesions measured at baseline must be measured at subsequent disease assessments, and recorded on the scan reports.  
All non-measurable lesions noted at baseline must be reported as present or absent. Investigators must ensure that 
their radiologists are aware of the requirement to follow up and measure every target lesion mentioned at baseline and 
comment on the non-target lesions in accordance with RECIST (V1.1) criteria. 
13.2
Tumour response 
To be assigned a status of CR or PR, changes in tumour measurements must be confirmed by two consecutive 
observations.  To be assigned a status of stable disease (SD), follow-up measurements must have met the SD criteria at 
least once and at least six weeks after study treatment is started. Should rapid tumour progression occur before the 
completion of treatment the patient will be classified as having early progression (EP). Tumour response should be 
classified as “not evaluable” (NE), only when it is not possible to classify it under another response category, e.g., when 
baseline and/or follow-up assessment is not performed or not performed appropriately. The applicable overall response 
category for each visit that includes disease assessment must be recorded in the medical record for inclusion in the 
appropriate CRF in OpenClinica. 
13.3
Other definitions of outcome: 
Toxic death:
Any death to which drug toxicity is thought to have a major contribution. 
Early death:
Death during the first three weeks of treatment that is not a toxic death. 
14
SAFETY REPORTING 
The Investigator will monitor each patient for clinical and laboratory evidence of adverse events on a routine basis 
throughout the study. Should an Investigator become aware of any study drug related SAEs following this period these 
must also be reported as stated below. Adverse event monitoring starts from the time the patient consents to the study 
until they complete the trial. All reportable AEs will be followed to a satisfactory conclusion. Any reportable drug-related 
AEs that are unresolved at the end of treatment visit are to be followed up by the Investigator until resolution or 
stabilisation. All AEs reported to the Trial Office will be processed according to internal SOPs. The Trial Office may 
request additional information for any AE as judged necessary. 


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14.1
Adverse Event Definitions 
An Adverse Event or experience (AE) is any untoward medical occurrence in a study subject temporally associated with 
the administration of an investigational medicinal product (IMP) or a comparator product, whether or not considered 
related to the IMP or a comparator product. An AE can therefore be any unfavourable and unintended sign, symptom, 
disease (new or exacerbated) and /or significant abnormal laboratory or physiological observation temporally 
associated with the use of a medicinal product. For marketed medicinal products, this also includes failure to produce 
expected benefits (i.e. lack of efficacy), abuse or misuse. 
A Serious Adverse Event (SAE) is any AE, regardless of dose, causality or expectedness, that: 
Results in death 
Is life-threatening  
This refers to an event in which the subject was at risk of death at the 
time of the event.  It does not refer to an event, which hypothetically 
might have caused death, if it were more severe. 

Requires in-patient hospitalisation  
or prolongs existing inpatient 
hospitalisation  
In general, hospitalisation signifies that the subject has been 
admitted (usually involving at least an overnight stay) at the hospital 
or emergency ward for observation and/or treatment that would not 
have been appropriate in the physician’s office or out-patient 
setting.  Complications that occur during hospitalisation are AEs.  If a 
complication prolongs hospitalisation or fulfils any other serious 
criteria, the event is serious.  When in doubt as to whether 
hospitalisation occurred or was necessary, the AE should be 
considered serious. 

Results in persistent or significant 
incapacity or disability 
This means a substantial disruption of a person’s ability to conduct 
normal life functions.  It does not include experiences of relatively 
minor medical significance or accidental trauma (e.g. sprained 
ankle), which do not constitute a substantial disruption. 

Is a congenital anomaly or birth defect 

Is any other medically important event 
Defined as an event that may jeopardise the patient or may require 
intervention to prevent one of the outcomes listed above. Any new 
primary cancer must be reported as an SAE. 
An Adverse Drug Reaction (ADR) is an AE which is considered to be causally related to any dose of the IMP.  This means 
that a causal relationship between the IMP and the AE is at least a reasonable possibility, i.e., the relationship cannot 
be ruled out. 
An Unexpected Drug Reaction is an adverse drug reaction, the nature or severity of which, is not consistent with 
applicable product information (referring to information in SPC or IB).
A Suspected Unexpected Serious Adverse Drug Reaction (SUSAR) is a serious adverse drug reaction, the nature or 
severity of which is not consistent with the applicable product information (e.g. Investigator’s Brochure for an 
unapproved investigational product or SPC for an approved product). 
14.2
Clinical laboratory abnormalities and other abnormal assessments as AEs and SAEs 
Abnormal laboratory findings (e.g., clinical chemistry, haematology, urinalysis) or other abnormal assessments (e.g., 
ECGs, X-rays and scans) that are judged by the Investigator as clinically significant will be recorded as AEs or SAEs if they 
meet the definitions given above.
Clinically significant abnormal laboratory findings or other abnormal assessments that are detected during the study or 
are present at baseline and significantly worsen following the start of the study will be reported as AEs or SAEs.  
However, 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 start of the study and do not worsen, will not be reported as AEs or SAEs. The 


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Investigator will exercise his or her medical and scientific judgment in deciding whether an abnormal laboratory finding 
or other abnormal assessment is clinically significant.  
14.3
Determining adverse event causality 
The assessment of “relatedness” must be determined by a medically qualified individual and is the responsibility of 
the PI at site or agreed designee. AEs that will be considered related will include any AE that is documented as 
possibly, probably or definitely related to protocol treatment. The assessment of relatedness is made using the 
following: 
Classification 
Relationship 
Definition 
 drug-related 
Definitely 
related 

Starts within a time related to the study drug administration and

No obvious alternative medical explanation. 
Probably 
related 

Starts within a time related to the study drug administration and

Cannot be reasonably explained by known characteristics of the patient’s clinical state.
Possibly 
related 

Starts within a time related to the study drug administration and

A causal relationship between the study drug and the adverse event is at least a 
reasonable possibility. 
not drug 
related 
Probably 
not related 

The time association or the patient’s clinical state is such that the study drug is not 
likely to have had an association with the observed effect. 
Definitely 
not related 

The AE is definitely not associated with the study drug administered. 
The Investigator must endeavour to obtain sufficient information to confirm the causality of the adverse event (i.e. 
relation to surgery, study drug, background treatment, other illness, progressive malignancy etc) and give their opinion 
of the causal relationship between each AE and study drug.  This may require instituting supplementary investigations 
of significant AEs based on their clinical judgement of the likely causative factors and/or include seeking a further 
specialist opinion. 
14.4
Reference safety information (RSI) for assessment of expectedness 

The reference safety information (RSI) for the IMP M6620 (Berzosertib) is section 7 of the IB for M6620 (Berzosertib) 
and lists all the expected side effects associated with the use of M6620 (Berzosertib).  

The Reference Safety Information for the IMP capecitabine is the SmPC version provided by OCTO (approved for 
use in this trial by the MHRA).1

The Reference Safety Information for the IMP cisplatin is the SmPC version provided by OCTO (approved for use in 
this trial by the MHRA).1
1It is not specified that any particular brand of Capecitabine or Cisplatin must be prescribed, however irrespective of the 
brand prescribed, the RSI to be referenced is provided by OCTO. N.B: This may not be the latest SmPC version available 
online. 
A copy of the current approved version of the RSI documents for each IMP must be held in the Site File for reference. 
Any change or update to the RSI during the trial will be made via substantial amendment. 
Please note that the list of expected side effects in the SmPCs for cisplatin and capecitabine are those listed for patients 
receiving standard chemoradiotherapy or chemotherapy alone. It is therefore possible that in this study population, 
where combination of M6620 (Berzosertib) is used with standard chemoradiotherapy or chemotherapy alone, other 
side effects may occur, or the patient might suffer a more severe reaction. 


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14.4.1
Expected adverse events associated with Radiotherapy 
Fatigue, oesophagitis, odynophagia, dyspnoea, nausea, vomiting, skin erythema and desquamation. Late toxicity risks 
of lung fibrosis, oesophageal stricture, oesophageal perforation, cardiac toxicity and secondary malignancy. 
14.5
Summary of trial safety reporting requirements 
Please note all standard treatment toxicities must be reported because the TiTE-CRM trial design is based on an 
expected frequency of standard treatment toxicities plus M6620 (Berzosertib) related toxicities. 
Event 
DLT  
SAE1
AE/SAE 
AE/SAE 
AE/SAE defined as Dose limiting toxicity (DLT) defined as per NCI 
CTCAE v4.03
Email reporting form 
within 24 hours 
Report in 
AE CRF 
Non 
reportable 
Absolute neutrophil count (ANC) <0.5 x 109/L for >7days  
X 
X 
X 
Febrile Neutropenia (ANC <1.0 x 109/L, fever >38.5oC) for >3 days
X 
X 
X 
Infection (documented clinically or microbiologically) with Grade 3 or 4 
neutropenia (absolute neutrophil count <1.0 x 109/L) 
X 
X 
X 
Platelets <25 x 109/L (Grade ≥4) 
X 
X 
X 
Clinically significant bleeding attributed to  grade 3 thrombocytopenia 
or requiring platelet transfusion 
X 
X 
X 
Grade ≥3 oesophagitis onset during induction chemotherapy or within 
2 weeks of starting radiotherapy 
X
X 
X 
Grade ≥3 pneumonitis onset within 3 months of starting radiotherapy 
X 
X 
X 
Grade ≥3 elevation of ALT or AST  lasting 8 days or more 
X 
X 
X 
A concurrent elevation of ALT or AST >3 × ULN and total bilirubin >2 
× ULN in whom there is no evidence of biliary obstruction or other 
causes that can reasonably explain the concurrent elevation 
X 
X 
X 
Grade ≥3 nausea or vomiting not controlled by optimal outpatient 
anti-emetic treatment 
X 
X 
X 
Grade ≥3 diarrhoea despite optimal outpatient anti-diarrhoeal 
medication use 
X 
X 
X 
Other grade ≥ 3  effects thought to be directly treatment related to 
the combination of M6620 (Berzosertib) with radiotherapy or 
chemotherapy 
X 
X 
X 
Any toxicity causing a delay of radiotherapy completion by greater 
than one week for Stage A                        
X
X 
X 
Any toxicity causing radiotherapy delivery delay by ≥3 consecutive 
fractions for stage B 
X 
X 
X 
Missing 2 consecutive doses of M6620 (Berzosertib) within a cycle due 
to Grade ≥3 toxicity 
X 
X 
X 
Death due to drug related complications 
X 
X 
X 
Cardiac toxicity: see section 9.1.2 
X 
X 
X 
A delay of any of the 3 treatments of 7 days or more within a cycle due 
to treatment related toxicity 
x 
x 
x 
AE/SAE defined as late DLT (onset 6 weeks after completion of 
radiotherapy) as per RTOG/EORTC late toxicity and Mellow Dysphagia 
score (Appendix C, D)
Grade ≥3 lung and heart toxicity – onset 6 weeks after completion of 
radiotherapy 
X 
X 
X 
Grade 3 oesophageal toxicity with an increase in Mellow score by ≥2 
since baseline (need to exclude disease progression on CT and/or 
endoscopy and biopsy) - onset 6 weeks after completion of 
radiotherapy 
X 
X 
X 


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Grade 4 oesophageal toxicity - onset 6 weeks after completion of 
radiotherapy 
X 
X 
X 
Medically important events in the context of this trial (considered 
dose limiting and possibly related to M6620 (Berzosertib) combined 
with Radiotherapy +/- chemotherapy by the TMG) 
Email reporting form 
within 24 hours 
Report in 
AE CRF 
Non 
reportable 
Any AE not listed above that is grade ≥3 
X 
X 
AE considered more severe than expected 
X 
X 
AE Grade <3 that is unexpected and thought to be directly treatment 
related to the combination of M6620 (Berzosertib) with radiotherapy 
+/- chemotherapy 
X 
X 
AE resulting in withdrawal 
X 
X 
Any late grade  ≥3 toxicities – onset 6 weeks after completion of 
radiotherapy 
X 
X 
Any late grade  2 toxicities – onset 6 weeks after completion of 
radiotherapy 
X 
Acute Hypersensitivity reaction 
X 
X 
Expected non-dose limiting toxicities  
Email reporting form 
within 24 hours 
Report in 
AE CRF 
Non 
reportable 
Anaemia 
If grade≥4 
X 
Abdominal pain
If grade≥4 
X 
Cough 
X 
Decreased appetite 
If grade≥4 
X 
Elevated ALT/AST lasting less than 8 days 
If grade≥4 
X 
Fatigue
If grade≥4 
X 
Headache 
X 
Low lymphocytes 
X 
Infusion-related site reaction 
If grade≥3 
X 
Skin rash/discolouration related to sun exposure 
If grade≥4 
X 
Grade <3 nausea or vomiting 
X 
All other AEs, abnormal assessments or laboratory results 
Email reporting form 
within 24 hours 
Report in 
AE CRF 
Non 
reportable 
All other AEs, assessments, abnormal laboratory results, if clinically 
significant 
If grade≥3  
X 
AE is life-threatening  
X 
X 
AE requires in-patient hospitalisation or prolongs existing inpatient 
hospitalisation  
X 
X 
AE results in persistent or significant incapacity or disability 
X 
X 
AE is a congenital anomaly or birth defect 
X 
X 
AE is any other medically important event 
X 
X 
Disease progression and resultant death 
Email reporting form 
within 24 hours 
Report in 
AE CRF 
Non 
reportable 
Hospitalisation (for progression or procedures planned prior to 
informed consent  ) 
X 


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Clinical symptoms of progression 
X 
Death 
Possibly 
related 
directly to 
M6620 
(Berzosertib) 
or the 
combination 
of M6620 
(Berzosertib) 
+ 
radiotherapy 
+/- 
chemotherapy 
Report 
death and 
reason on 
death 
notification 
CRF 
14.6
Suspected Unexpected Serious Adverse Drug Reactions (SUSARs) 
All SUSARS must be reported by the Trial Office to the responsible Authority and REC within the required timelines: 

Fatal or life threatening SUSARs will be reported within 7 days of the Trial Office receiving the initial report. 
Any additional information will be reported within eight days of sending the first report. 

All other SUSARs will be reported within 15 days of the Trial Office receiving the initial report 
In addition, other safety issues qualify for expedited reporting where they might materially alter the current risk 
assessment of an IMP or be sufficient to change IMP administration or the overall conduct of the trial. Chemotherapy 
SUSARs will be reported via the Yellow Card Scheme. 
14.7
Expedited reporting of SAEs 
The following SAE reporting requirements apply regardless of the Investigator’s assessment of the causality or 
expectedness of the SAE.  All SAEs should be reported on the trial SAE report form (see SAE report form and completion 
guidelines). 
If a Serious Adverse Event occurs that requires reporting, a Serious Adverse Event reporting form should be completed 
and scanned and emailed as a PDF attachment within 24 hours of becoming aware of the event to: 
Pharmacovigilance Office, OCTO 
Email: octo-safety@oncology.ox.ac.uk 
Tel no:  +44 (0) 01865 617082 
If the SAE has not been reported within the specified timeframe, a reason for lateness must be provided when sending 
the SAE Report Form. 
Investigators should also adhere to their local Trust policy for incident and SAE reporting in research. AEs which are 
serious must be reported to the Trial Office from the first dose of study medication up to and including 30 days after 
administration of the last dose of study treatment, or the end of the DLT reporting period, whichever is longer. Any SAE 
that occurs at any time after completion of treatment or after the designated follow-up period that the Investigator 
and/or Sub-Investigator consider to be related to any study drug must be reported to the Trial Office.  
The Trial Office will be responsible for reporting all SAEs to MERCK KGAA, DARMSTADT GERMANY within 24 hours of 
receiving an SAE report. 
14.8
Follow-up of Serious Adverse Events 
A follow-up report must be completed when the SAE resolves, is unlikely to change, or when additional information 
becomes available. If the SAE is a suspected SUSAR then follow up information must be provided as requested by the 
Trial Office. 
If new or amended information on a reported SAE becomes available, the Investigator should report this on a new SAE 
form using the completion guidelines.  If using the original form to notify further information, you must initial and date 
all new or amended information so that all changes are clearly identified.  


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SAEs that are considered to be definitely unrelated to the trial intervention will not be followed up and monitored. 
14.9
Reporting Adverse Events on the CRF 
All AEs, including Serious AEs must be recorded on the case report forms (CRF) for that patient (unless otherwise 
specified in section 14.10). The information provided will include date of onset, event diagnosis (if known) or 
sign/symptom, severity, time course, duration and outcome and relationship of the AE to study drug.  Any concomitant 
medications or any other therapy used to treat the event must be listed. The Investigator will provide an “other” cause 
for serious AEs considered to be unrelated to the study drug.  Sites should ensure data entered into the CRF is consistent 
with the SAE report information where applicable. 
Each separate AE episode must be recorded. For example, if an AE resolves completely or resolves to baseline and then 
recurs or worsens again, this must be recorded as a separate AE. For AEs to be considered intermittent, the events must 
be of similar nature and severity. 
AEs occurring from the first dose of study medication up to the end of study visit must be recorded on the CRF. AEs may 
be spontaneously reported by the patient and/or in response to an open question from study personnel or revealed by 
observation, physical examination, or other diagnostic procedures. Any clinically relevant deterioration in laboratory 
assessments or other clinical finding is considered an AE. AEs which result in early withdrawal must be reported using 
the Early Withdrawal Form. 
Terms and Grading of Events 
All adverse events and toxicities must be graded according to the NCI Common Terminology Criteria for adverse events 
(NCI-CTCAE) Version 4.0 (currently up to Version 4.03).   
14.10 Events exempt from being reported as AE/ SAEs 
Progression of underlying disease 
Disease progression and resultant death will be captured on the CRF.  Adverse events including hospitalisation that are 
clearly consistent with disease progression will not be reported as individual AE/SAEs. Clinical symptoms of progression 
will only be reported as adverse events if the symptom cannot be determined as exclusively due to the progression of 
the underlying malignancy, or does not fit the expected pattern of progression for the disease under study. 
Every effort should be made to document the objective progression of underlying malignancy.  In some cases, the 
determination of clinical progression may be based on symptomatic deterioration. For example, progression may be 
evident from clinical symptoms, but is not supported by tumour measurements. Or, the disease progression is so evident 
that the Investigator may elect not to perform further disease assessments.  
Death on study 
Death on study is to be recorded on the Death CRF. The Investigator must clearly state in the source data if a causal 
relationship to the study IMP or other protocol treatment intervention is suspected and this should be the primary 
reason given on the Death CRF. If study treatment or other protocol intervention is suspected an SAE form should also 
be completed.  
Elective admissions and supportive care 
Admissions to hospital for patient convenience or for procedures planned prior to informed consent or investigations 
or treatment as specified in this protocol and standard supportive care are not SAEs, and do not require SAE reporting.   
14.11 Informing Investigators of new safety information 
The Trial Office or the Chief Investigator will ensure that all investigators are kept informed in a timely manner, as new 
safety profile information becomes available. Investigators are responsible for briefing their study team and onward 
transmission to their R&D office as appropriate. 
15
PREGNANCY  
Expedited reporting is required for pregnancies (in a participant or partner) occurring within 6 months of a participants 
last dose of the study drug or 13 weeks after last patient treatment, whichever comes sooner. A Pregnancy Form should 
be completed and scanned and emailed  to the Trial Office within the same timelines as an SAE. All reported pregnancies 
should be followed and the outcome reported using the same form. If the outcome of the pregnancy meets any of the 


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criteria for seriousness, it must also be reported as an SAE.  Examples of pregnancy outcomes that are SAEs include 
reports of: 

congenital anomalies or developmental delay, in the foetus or the child. 

foetal death and spontaneous abortion.      

suspected adverse reactions in the neonate that are classified as serious. 
Women who become pregnant should be withdrawn from trial treatment immediately. 
16
DEFINING THE END OF TRIAL  
For Stage A1 the last patient last visit (LPLV) will be 9 weeks post end of radiotherapy for Stage A2 LPLV will be 8 weeks 
post end of chemotherapy, and for Stage B the LPLV will be 13 weeks post end of radiotherapy.  However for Stage A1 
& A2 this will be followed by the non-interventional phase of follow-up, which will continue for 12 months from start of 
treatment or when all participants have died (whichever comes first). This will be done via the hospital. But in the longer 
term this may be carried out via the Health & Social Care Information Centre. For the purpose of the Research Ethics 
Committee approval the trial end date will be the last patient start of treatment plus 24 weeks for Stage B. The Clinical 
Study Report (CSR) will be presented within 1 year of end of trial. 
The sponsor and the Chief Investigator reserve the right to terminate the study earlier at any time. In terminating the 
study, they must ensure that adequate consideration is given to the protection of the participants’ best interests. 
17
STATISTICAL CONSIDERATIONS  
17.1
Sample size and power 
Sample size estimates are based on 1,000 simulated TiTE-CRM trials using the same characteristics that the actual trial 
will be based upon. The patients will not be replaced and the TiTE-CRM will use all accumulated critical toxicity summary 
data. For Stage A1, to treat 10 patients at a particular treatment plan or reach a maximum of 20 patients, 18 (95% C.I.: 
(10, 20)) patients are required. For Stage A2, to treat 6 patients at dosing schedule 4 or reach a maximum of 20 patients, 
16 (95% C.I.: (11, 20)) are required.  Stage B is expected to recruit a minimum of 15 patients and has a maximum sample 
size of 25. 
18
STATISTICAL ANALYSIS PLAN 
For all analyses, patients will be included according to the treatment to which they are assigned. All patients, regardless 
of how much treatment received and follow-up completed, will contribute to analysis. 
It is therefore important that every effort is made to encourage patients, including those patients who do not 
receive/complete their allocated treatment, to attend for follow-up clinic visits to avoid bias in the analysis of the results. 
A detailed statistical analysis plan will be available from the time the first patient is recruited and will be finalised before 
any analysis is undertaken. The analysis plan will be written in accordance with the current OCTRU standard operating 
procedures and will be finalised and agreed by the trial statistician and the CI. Sites must report any unintended 
deviations/violations to OCTO according to the procedure outlined during site initiation training. 
18.1
Inclusion in analysis 
All patients enrolled in the study, will be accounted for and included in the analyses. The number of patients who were 
not evaluable, who died or withdrew before treatment began will be recorded. The distribution of follow-up time will 
be described and the number of patients lost to follow-up will be given. 
Variables will be analysed to determine whether the criteria for the study conduct are met. This will include a description 
of patients who did not meet all the eligibility criteria, an assessment of protocol deviations, study drug accountability 
and other data that impact on the general conduct of the study. 
Baseline characteristics will be summarised for all enrolled patients. Patients who died or withdrew before treatment 
started or do not complete the required safety observations will be described and evaluated separately. Treatment 
related toxicity will be tabulated by type and grade of toxicity. Evaluable for toxicity: All patients will be evaluable for 


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toxicity from the time of their first treatment. Adverse events will be summarised by the number of patients 
experiencing each type of event. The grades and causality will be reported. 
18.2
Subgroup analysis 
No subgroup analysis is planned. 
18.3
Interim Analyses 
The trial will use the TiTE-CRM to allocate dose and   critical toxicity data will be reviewed prior to deciding the 
treatment schedule for each patient recruited.
18.4
Procedures for reporting any deviation(s) from the protocol 
Any deviations from the original statistical plan will be described and justified in the final report. 
18.5
 Analysis for Safety 
The variables that define the DLTs and safety variables will be summarized by descriptive statistics with patients grouped 
according to schedule received. Number (with percentages) of patient with and without DLT will also be presented 
according to schedule. 
18.6
Final analysis 
Based upon projected accrual rates, this trial (Stage A1, A2 and B) is expected to complete recruitment within 30 months 
of opening to recruitment. Final analysis for Stage A will be after all patients have been followed up for at least 3 months 
in Stage A1 and 26 weeks in Stage A2 while for Stage B, it will be performed within 12 months after Stage B last patient 
start of treatment. 
19
TRIAL COMMITTEES 
19.1
Trial Management Group (TMG) 
The Chief Investigator will chair a TMG responsible for overseeing the successful conduct and publication of the trial. 
The TMG will include Chief Investigator, Co- Investigators, Radiotherapy Team Representative, Trial Manager, Trial 
Statistician and others as required.  The TMG will meet as necessary to discuss toxicity data and to decide on dose 
escalation. TMG membership and decision making procedures will be documented in the TMG charter.  
19.2
Safety Review Committee 
There is no independent Data and Safety Monitoring Committee (DSMC) for this study. The Safety Review Committee 
(SRC) will be convened as required to review DLTs, review decisions as to the recommended dose to be administered, 
and review the stop/start rules for each stage. The main outcomes will be analysed as stated above in the analysis plan 
and will not be analysed as an interim analysis. SRC will have 3 independent members who will attend both open and 
closed session of the SRC meeting. 
The SRC will consist of: 
1. Trial Statistician 
2. Independent Statistician 
3. OCTO trial management representative 
4. Either: 
a. One Medical Oncologist and one Clinical Oncologist or 
b. Two Clinical Oncologists 
The SRC Charter document for this study will define the exact membership and who should be present for decisions to 
be made. Further internal or external experts may be consulted by the SRC, as necessary. Any PI can request an ad hoc 
SRC meeting at any time in order to facilitate the immediate communication of any emerging safety issues during 
the course of the study. 
19.3
Trial Steering Committee  
RIOC will act as the TSC. The role of RIOC is to provide oversight for the trial on behalf of the Sponsor and Funder.  The 
TSC will provide overall supervision of the safe and effective conduct of the study. The TSC will review trial progress 


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against agreed milestones, adherence to protocol, and patient safety, and consider new information. The TSC has the 
authority to recommend study closure where appropriate.  
20
DATA MANAGEMENT 
20.1
Database considerations 
Data management will be performed via a web-based, bespoke trial database (OpenClinica). OpenClinica is a dedicated 
and validated clinical trials database designed for electronic data capture. See: http://www.openclinica.org.   
The Trial Office will provide sites with instructions and a video link for training purposes.  
The participants will be identified by a unique trial specific number and year of birth. Initials, age and gender will be 
stored as data items within the eCRF but will not be used to identify patient records. These details will be used to assess 
eligibility and for statistical review of participant demographics. The name and any other identifying detail will NOT be 
included in any trial data electronic file. 
20.2
Case reports forms (CRFs) 
The Investigator and study site staff will ensure that data collected on each subject is recorded in the CRF as accurately 
and completely as possible.   All appropriate laboratory data, summary reports and Investigator observations will be 
transcribed into the CRFs from the relevant source data held in the site medical record(s). CRFs entries will not contain 
any source data (unless otherwise specified in the completion instructions provided by the Trial Office). It is important 
to ensure that: 

the relevant CRFs are completed. 

all CRF data are verifiable in the source documentation or the discrepancies must be explained.  

CRF sections are completed in a timely fashion, as close to the visit or event being recorded as possible. This 
trial uses a continual reassessment model for dose escalation, where escalation decisions are made based on 
all critical toxicity summary data entered to date. It is necessary to enter all participant data as soon as possible 
to allow accurate assessment of the data and appropriate dose escalation decisions to be made. 

Data queries are resolved and documented by authorised study staff in a timely fashion. The reason for the 
change or correction should be given where appropriate. 

As much data as possible is entered and cleaned in preparation for each study database lock point. 
Note: ‘in a timely fashion’ means within no more than 5 working days of the initial event and within 14 days of receipt 
of a data query unless otherwise specified. 
If a patient withdraws from the study the Trial Office must be informed within 24 hours using the Early Withdrawal 
Form, the reason must be noted and the patient must be followed-up as per protocol.  
20.3
Accounting for missing, unused, or spurious data. 
The statistical analysis plan will describe the procedure for accounting for missing, unused or spurious data. 
20.4
Clinical study report  
All clinical data will be presented at the end of the study as data listings. These will be checked to confirm the lists 
accurately represents the data collected during the course of the study.  The trial data will then be locked and a final 
data listing produced. The locked trial data may then be used for analysis and publication. The Clinical Study Report will 
be based on the final data listings. The Clinical Study Report will include the analysis of the routine survival data collected 
up to 12 months for Stage A1 and A2. The CSR will be presented within 1 year of end of trial. 
21
STUDY SITE MANAGEMENT 
21.1
Study site responsibilities 
The Principal Investigator (the PI or lead clinician for the study site) has overall responsibility for conduct of the study, 
but may delegate responsibility where appropriate to suitably experienced and trained members of the study site team.  
All members of the study site team must complete the Staff Contact and Responsibilities Sheet provided prior to 
undertaking any study duties.  The PI must counter sign and date each entry in a timely manner, authorising staff to 
take on the delegated responsibilities.  


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21.2
Study site protocol deviations 
The Investigator must document and explain any deviations/violations from the approved protocol. The Investigator 
should promptly report any important deviations that might impact patient safety, data integrity or be a possible serious 
breach (see 22.7 below) to the Trial Office.  
21.3
Study site set up and activation 
The PI leading the investigational study site is responsible for providing all required core documentation.  Mandatory 
Site Training organised by the Trial Office must be completed before the site can be activated.  The Trial Office will check 
to confirm that the site has all the required study information/documentation and is ready to recruit.  The site will then 
be notified once they are activated on the trial database and able to enter patients. 
21.4
Arrangements for sites outside the UK 
Not applicable 
21.5
Study documentation 
The Trial Office will provide an Investigator Site File and Pharmacy File to each investigational site containing the 
documents needed to initiate and conduct the study.  The Trial Office must review and approve any local changes made 
to any study documentation including patient information and consent forms prior to use. Additional documentation 
generated during the course of the trial, including relevant communications must be retained in the site files as 
necessary to reconstruct the conduct of the trial. 
22
REGULATORY AND ETHICAL CONSIDERATIONS 
The Sponsor and Investigators will ensure that this protocol will be conducted in compliance with the UK Clinical Trials 
Regulations1 and the applicable policies of the sponsoring organisation. Together, these implement the ethical principles 
of the Declaration of Helsinki (1996) and the regulatory requirements for clinical trials of an investigational medicinal 
product under the European Union Clinical Trials Directive. 
22.1
Ethical conduct of the trial and ethics approval 
The Protocol, Patient Information Sheet, Consent Form and any other information that will be presented to potential 
trial patients (e.g. patient card or information that supports or supplements the informed consent) will be reviewed and 
approved by an appropriately constituted, independent Research Ethics Committee (REC). Principal Investigators will 
be approved by the REC. 
22.2
Regulatory Authority approval 
This study will be conducted under a UK Medicines and Healthcare Products Regulatory Agency (MHRA) Clinical Trials 
Authorisation (CTA). Approval to conduct the study will be obtained from the Responsible Authority prior to initiating 
the study.  
22.3
NHS Research Governance 
Investigators are responsible for ensuring they obtain local Trust management agreement to conduct the trial in 
accordance with local arrangements and policies. 
22.4
Protocol amendments 
Amendments are changes made to the research following initial approval. A ‘substantial amendment’ is an amendment 
to the terms of the Responsible Authority application (if applicable), the REC application, or to the protocol or any other 
supporting documentation, that is likely to affect to a significant degree: 

the safety or physical or mental integrity of the subjects of the trial; 

the scientific value of the trial; 

the conduct or management of the trial; or 

the quality or safety of the investigational medicinal product(s) used in the trial. 
Non-substantial amendments are those where the change(s) involve only minor logistical or administrative aspects of 
the study. All amendments will be generated and managed according to the Trial Office standard operating procedures 
1 The Medicines for Human Use (Clinical Trials) Regulations (S.I. 2004/1031) and any subsequent amendments to it. 


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to ensure compliance with applicable regulation and other requirements. Written confirmation of all applicable REC, 
regulatory and local approvals must be in place prior to implementation by Investigators. The only exceptions are for 
changes necessary to eliminate an immediate hazard to study patients (see below). 
It is the Investigator’s responsibility to update patients (or their authorised representatives, if applicable) whenever new 
information (in nature or severity) becomes available that might affect the patient’s willingness to continue in the trial.  
The Investigator must ensure this is documented in the patient’s medical notes and the patient is re-consented if 
appropriate. 
22.5
Urgent safety measures 
The sponsor or Investigator may take appropriate urgent safety measures to protect trial participants from any 
immediate hazard to their health or safety. Urgent safety measures may be taken without prior authorisation. The trial 
may continue with the urgent safety measures in place. The Investigator must inform the Trial Office IMMEDIATELY if 
the study site initiates an urgent safety measure:
The notification must include: 

Date of the urgent safety measure; 

Who took the decision; and 

Why the action was taken. 
The Investigator will provide any other information that may be required to enable the Trial Office to report and manage 
the urgent safety measure in accordance with the current regulatory and ethical requirements for expedited reporting 
and close out. The Trial Office will follow written procedures to implement the changes accordingly.    
22.6
Temporary halt 
The sponsor and Investigators reserve the right to place recruitment to this protocol on hold for short periods for 
administrative reasons or to declare a temporary halt. A temporary halt is defined a formal decision to: 

interrupt the treatment of subjects already in the trial for safety reasons; 

stop recruitment on safety grounds; or 

stop recruitment for any other reason(s) considered to meet the substantial amendment criteria, including 
possible impact on the feasibility of completing the trial in a timely manner. 
The Trial Office will report the temporary halt via an expedited substantial amendment procedure. The trial may not 
restart after a temporary halt until a further substantial amendment to re-open is in place.  If it is decided not to restart 
the trial this will be reported as an early termination. 
22.7
Serious Breaches 
The Medicines for Human Use (Clinical Trials) Regulations require the Sponsor to notify any "serious breaches" to the 
MHRA within 7 days of the sponsor becoming aware of the breach. A serious breach is defined as “A breach of GCP or 
the trial protocol which is likely to effect to a significant degree:  

the safety or physical or mental integrity of the subjects of the trial; or 

the scientific value of the trial” 
Investigators must notify the Trial Office within one working day if any serious breach of GCP is suspected.  The Trial 
Office will review the event and, if appropriate a report will be submitted to the REC, Regulatory Authority and the NHS 
host organisation within 7 days of the Trial Office becoming aware of the breach as per Trials Office SOPs. 
22.8
Trial Reports 
This protocol will comply with all current applicable Regulatory Authority, Research Ethics Committee and Sponsor 
reporting requirements.  
The Trial Office will determine which reports need to be circulated to Principal Investigators and other interested 
parties. Study sites are responsible for forwarding trial reports they receive to their local Trust as required. 


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23
EXPENSES AND BENEFITS 
The participating study site may provide reasonable travel expenses incurred for attending additional research visits in 
excess of standard of care as per local practice. The local arrangements will be explained to the patient during the 
informed consent discussions prior to trial entry. However, there is no direct study funding to reimburse patient 
expenses. 
24
QUALITY ASSURANCE 
24.1
Risk assessment  
A risk assessment and a monitoring plan will be prepared before the study opens and will be reviewed throughout the 
study if necessary in the light of significant changes while the study is ongoing or in response to outcomes from 
monitoring activities.  Monitoring plans will be amended as appropriate. 
24.2
Monitoring 
Regular monitoring will be performed according to the monitoring plan. Data will be evaluated for compliance with the 
protocol, completeness and accuracy. The Investigator and institutions involved in the study will permit study-related 
monitoring and provide direct on-site access to all study records and facilities if required. They will provide adequate 
time and space for the completion of monitoring activities. 
Study sites will be monitored centrally by checking incoming data for compliance with the protocol, consistency, 
completeness and timing.  The case report data will be validated using appropriate set criteria, range and verification 
checks.  The study site must resolve all data queries in a timely manner.   All queries relating to key outcome and safety 
data and any requiring further clarification will be referred back to the study site for resolution. For other non-critical 
data items, OCTO staff may resolve data queries centrally providing the correct answer is clear. Such changes will be 
clearly identified in the CRF and the study site informed. 
Study sites will also be monitored remotely and/or by site visit as necessary to ensure their proper conduct of the trial.  
OCTO staff will be in regular contact with site personnel to check on progress and deal with any queries that they may 
have. Monitoring reports will be sent to the site in a timely fashion.  The Investigator is expected to action any points 
highlighted through monitoring and must ensure that corrective and preventative measures are put into place as 
necessary to achieve satisfactory compliance. 
If sites are required to provide copies of participant information to the Trial Office for remote monitoring purposes, all 
patient personal identifiers must be obliterated from the information. 
24.3
Audit and Regulatory Inspection 
All aspects of the study conduct may be subject to internal or external quality assurance audit to ensure compliance 
with the protocol, GCP requirements and other applicable regulation or standards. It may also be subject to a regulatory 
inspection. Such audits or inspections may occur at any time during or after the completion of the study. Investigators 
and their host Institution(s) should understand that it is necessary to allow auditors/inspectors direct access to all 
relevant documents, study facilities and to allocate their time and the time of their staff to facilitate the audit or 
inspection visit. Anyone receiving notification of a Regulatory Inspection that will (or is likely to) involve this trial must 
inform the Trial Office without delay. 
25
RECORDS RETENTION & ARCHIVING 
During the clinical trial and after trial closure the Investigator must maintain adequate and accurate records to enable 
the conduct of a clinical trial and the quality of the research data to be evaluated and verified.  All essential documents 
must be stored in such a way that ensures that they are readily available, upon request for the minimum period required 
by national legislation or for longer if needed.  The medical files of trial subjects must be retained in accordance with 
applicable national legislation and the host institution policy. 
Retention and storage of laboratory records for clinical trial samples must also follow these guidelines. 
Retention and storage of central laboratory records supporting PD endpoints and the disposition of samples donated 
via the trial must also comply with applicable legislation and Sponsor requirements. 


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It is the University of Oxford’s policy to store data for a minimum of 5 years. Investigators may not archive or destroy 
study essential documents or samples without written instruction from the Trial Office. 
26
PATIENT CONFIDENTIALITY 
Personal data recorded on all documents will be regarded as confidential, and to preserve each patient’s anonymity, 
unique and anonymous trial specific number will be used for identification and year of birth will be recorded on the 
CRFs. Initials, age and gender will be stored as data items within the eCRF but will not be used to identify patient records. 
These details will be used to assess eligibility and for statistical review of participant demographics.
The Investigator site must maintain the patient’s anonymity in all communications and reports related to the research. 
The Investigator site team must keep a separate log of enrolled patients’ personal identification details as necessary to 
enable them to be tracked. These documents must be retained securely, in strict confidence. They form part of the 
Investigator Site File and are not to be released externally. 
The study will comply with the General Data Protection Regulation (GDPR) and Data Protection Act 2018, which require 
data to be de-identified as soon as it is practical to do so. The processing of the personal data of participants will be 
minimised by making use of a unique participant study number only on all study documents and any electronic 
database(s) with the exception of the CRF, where participant initials and Year of Birth may be added.  All documents 
will be stored securely and only accessible by study staff and authorised personnel. The study staff will safeguard the 
privacy of participants’ personal data. 
27
STUDY FUNDING 
The CHARIOT trial is being funded in part by the New Agents Committee (NAC), on behalf of Cancer Research UK 
(CRUKD/15/011). The Oncology Clinical Trials Office is supported by Cancer Research UK core funding. Merck KGaA, 
Darmstadt Germany are providing a grant and free M6620 (Berzosertib) to support the study. This study is further 
supported via the University of Oxford core clinical and research infrastructure underpinned by strategic research 
programme grant funds. This trial is on the NIHR portfolio. Local research network support should be available at each 
site taking part to support entry of participants into this trial.   
28
SPONSORSHIP AND INDEMNITY 
28.1
Sponsorship 
The Sponsor will provide written confirmation of Sponsorship and authorise the trial commencement once satisfied that 
all arrangements and approvals for the proper conduct of the trial are in place. A separate study delegation agreement, 
setting out the responsibilities of the Chief Investigator and Sponsor will be put in place between the parties.  
28.2
Indemnity 
The University has a specialist insurance policy in place which would operate in the event of any participant suffering 
harm as a result of their involvement in the research (Newline Underwriting Management Ltd, at Lloyd’s of London).  
NHS indemnity operates in respect of the clinical treatment that is provided. 
28.3
Contracts/Agreements 
This trial is subject to the Sponsor’s policy requiring that written contracts/agreements are agreed formally by the 
participating bodies as appropriate.  A Clinical Trial Agreement (CTA) will be placed between the Sponsor and 
participating organisations prior to site activation.   
The Sponsor will also set up written agreements with any other external third parties involved in the conduct of the trial 
as appropriate.  
29
PUBLICATION POLICY 
The sponsor will retain ownership of all data arising from the trial. The intention is to publish this research in a specialist 
peer reviewed scientific journal on completion of the study. The results may also be presented at scientific meetings 
and/or used for a thesis. The Investigators will be involved in reviewing drafts of the manuscripts, abstracts, press 
releases and any other publications arising from the trial and retain final editorial control. Authors will acknowledge 
that the study was Sponsored by and performed with the support of the Sponsor and other funding bodies as 
appropriate. 


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8. 
Charrier JD, Durrant SJ, Golec JM, Kay DP, Knegtel RM, MacCormick S, et al. Discovery of potent and selective 
inhibitors of ataxia telangiectasia mutated and Rad3 related (ATR) protein kinase as potential anticancer agents. 
Journal of medicinal chemistry. 2011 Apr 14;54(7):2320-30. PubMed PMID: 21413798. 
9. 
Reaper PM, Griffiths MR, Long JM, Charrier JD, Maccormick S, Charlton PA, et al. Selective killing of ATM- or 
p53-deficient cancer cells through inhibition of ATR. Nature chemical biology. 2011 Jul;7(7):428-30. PubMed PMID: 
21490603. 
10. 
Pires IM, Olcina MM, Anbalagan S, Pollard JR, Reaper PM, Charlton PA, et al. Targeting radiation-resistant 
hypoxic tumour cells through ATR inhibition. British journal of cancer. 2012 Jul 10;107(2):291-9. PubMed PMID: 
22713662. Pubmed Central PMCID: 3394988. 
11. 
Fokas E, Prevo R, Pollard JR, Reaper PM, Charlton PA, Cornelissen B, et al. Targeting ATR in vivo using the 
novel inhibitor VE-822 results in selective sensitization of pancreatic tumors to radiation. Cell death & disease. 
2012;3:e441. PubMed PMID: 23222511. Pubmed Central PMCID: 3542617. 
12. 
Crosby T, Hurt CN, Falk S, Gollins S, Mukherjee S, Staffurth J, et al. Chemoradiotherapy with or without 
cetuximab in patients with oesophageal cancer (SCOPE1): a multicentre, phase 2/3 randomised trial. The lancet 
oncology. 2013 Jun;14(7):627-37. PubMed PMID: 23623280. 
13. 
Conroy T, Galais MP, Raoul JL, Bouche O, Gourgou-Bourgade S, Douillard JY, et al. Definitive 
chemoradiotherapy with FOLFOX versus fluorouracil and cisplatin in patients with oesophageal cancer 
(PRODIGE5/ACCORD17): final results of a randomised, phase 2/3 trial. The lancet oncology. 2014 Mar;15(3):305-14. 
PubMed PMID: 24556041 
14.  
Knyrim K, Wagner H, Bethge N, Keymling, Vakil N. (1993). A controlled trial of an expansile metal stent for 
palliation of esophageal obstruction due to inoperable cancer. The New England Journal of Medicine; 78:1302-1307. 
PMID:7692297 
15. Allum WH, Blazeby JM, Griffin SM, Cunningham D, Jankowski JA, Wong R; Guidelines for the management of 
oesophageal and gastric cancer. Gut. 2011 Nov;60(11):1449-72. 


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31 APPENDIX A: ECOG PERFORMANCE SCALE 
32 APPENDIX B: MEASUREMENT OF DISEASE - RECIST CRITERIA 
RESPONSE EVALUATION CRITERIA IN SOLID TUMOURS 
Objective tumour response and time of progression will be measured according to the RECIST (Response Evaluation 
Criteria In Solid Tumours) criteria (version 1.1).  
Response criteria are essentially based on a set of measurable lesions identified at baseline as target lesions, and – 
together with other lesions that are denoted as non-target lesions – followed until disease progression. 
The following paragraphs are a quick reference to the RECIST criteria (version 1.1). The complete criteria are included 
in the published RECIST document: 
Eisenhauer, EA, Therasse, P, Bogaerts, J, et al. New response evaluation criteria in solid tumours: revised RECIST 
guideline (version 1.1). Eur J Cancer 2009;45:228-247 
And also available at: http://www.eortc.be/RECIST
B.1 
Measurability of tumour lesions at baseline 
B.1.1 
Definitions 

Measurable disease - the presence of at least one measurable lesion. If the measurable disease is restricted to 
a solitary lesion, its neoplastic nature should be confirmed by cytology/histology.  

Measurable lesions - tumour lesions that can be accurately measured in at least one dimension (longest 
diameter to be recorded) as ≥ 20 mm with chest x-ray, and as ≥ 10 mm with CT scan or clinical examination 
[using callipers]. Bone lesions are considered measurable only if assessed by CT scan and have an identifiable 
soft tissue component that meets these requirements (soft tissue component > 10 mm by CT scan).  Malignant 
lymph nodes must be ≥ 15 mm in the short axis to be considered measurable; only the short axis will be 
measured and followed. All tumour measurements must be recorded in millimetres (or decimal fractions of 
centimetres) by use of a ruler or callipers. Tumour lesions situated in a previously irradiated area, or in an area 
subjected to other loco-regional therapy, are usually not considered measurable unless there has been 
demonstrated progression in the lesion.  

Non-measurable lesions - All other lesions (or sites of disease), including small lesions are considered non-
measurable disease. Bone lesions without a measurable soft tissue component, leptomeningeal disease, 
ascites, pleural/pericardial effusions, lymphangitis cutis/pulmonis, inflammatory breast disease, lymphangitic 
involvement of lung or skin and abdominal masses followed by clinical examination are all non-measurable. 
Activity Performance Description 
Score 
Fully active, able to carry out all on all pre-disease performance without restriction. 
0 
Restricted in physically strenuous activity but ambulatory and able to carry out work of a light or 
sedentary nature, e.g. light housework, office work. 
1 
Ambulatory and capable of all self-care, but unable to carry out any work activities.  Up and about 
more than 50% of waking hours.  
2 
Capable of only limited self-care.  Confined to bed or chair more than 50% of waking hours.  
3 
Completely disabled. Cannot carry out any self-care. Totally confined to bed or chair. 
4 


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Nodes that have a short axis <10 mm at baseline are considered non-pathological and should not be recorded 
or followed.  

Target Lesions. When more than one measurable tumour lesion or malignant lymph node is present at baseline 
all lesions up to a maximum of 5 lesions total (and a maximum of 2 lesions per organ) representative of all 
involved organs should be identified as target lesions and will be recorded and measured at baseline. Target 
lesions should be selected on the basis of their size (lesions with the longest diameter), be representative of 
all involved organs, but in addition should be those that lend themselves to reproducible repeated 
measurements. Note that pathological nodes must meet the criterion of a short axis of ≥ 15 mm by CT scan 
and only the short axis of these nodes will contribute to the baseline sum. At baseline, the sum of the target 
lesions (longest diameter of tumour lesions plus short axis of lymph nodes: overall maximum of 5) is to be 
calculated and recorded. 

Non-target Lesions. All non-measurable lesions (or sites of disease) including pathological nodes (those with 
short axis ≥ 10 mm but < 15 mm), plus any measurable lesions over and above those listed as target lesions are 
considered non-target lesions. Measurements are not required but these lesions should be noted at baseline 
and should be followed as “present” or “absent”. 
All baseline evaluations should be performed as closely as possible to the beginning of treatment and never more than 
4 weeks before the beginning of the treatment. 
B.1.2 
Methods of measurements 
The same method of assessment and the same technique should be used to characterize each identified and reported 
lesion at baseline and during follow-up. Assessments should be identified on a calendar schedule and should not be 
affected by delays in therapy, which may be treatment arm dependent. While on study, all target lesions recorded at 
baseline should have their actual measurements recorded on the CRF at each subsequent evaluation, even when very 
small (e.g. 2 mm). If it is the opinion of the radiologist that the lesion has likely disappeared, the measurement should 
be recorded as 0 mm. If the lesion is believed to be present and is faintly seen but too small to measure, a default value 
of 5 mm should be assigned. For lesions which fragment/split add together the longest diameters of the fragmented 
portions; for lesions which coalesce, measure the maximal longest diameter for the “merged lesion”. 

Clinical Lesions. Clinical lesions will only be considered measurable when they are superficial and ≥ 10 mm as 
assessed using callipers (e.g. skin nodules). For the case of skin lesions, documentation by colour photography 
including a ruler to estimate the size of the lesion is recommended. If feasible, imaging is preferred. 

Chest X-ray. Chest CT is preferred over chest X-ray, particularly when progression is an important endpoint, 
since CT is more sensitive than X-ray, particularly in identifying new lesions. However, lesions > 20 mm on chest 
X-ray may be considered measurable if they are clearly defined and surrounded by aerated lung. 

CT, MRI. CT is the best currently available and reproducible method to measure lesions selected for response 
assessment. This guideline has defined measurability of lesions on CT scan based on the assumption that CT 
slice thickness is 5 mm or less. When CT scans have slice thickness greater than 5 mm, the minimum size for a 
measurable lesion should be twice the slice thickness.  MRI is also acceptable in certain situations (e.g. for body 
scans). While PET scans are not considered adequate to measure lesions, PET-CT scans may be used providing 
that the measures are obtained from the CT scan and the CT scan is of identical diagnostic quality to a diagnostic 
CT (with IV and oral contrast). 

Ultrasound. Ultrasound is not useful in assessment of lesion size and should not be used as a method of 
measurement. If new lesions are identified by ultrasound in the course of the study, confirmation by CT should 
be obtained.   

Endoscopy, Laparoscopy. The utilization of these techniques for objective tumour evaluation is not advised. 
However, they can be useful to confirm complete pathological response when biopsies are obtained or to 
determine relapse in trials where recurrence following complete response or surgical resection is an endpoint. 

Tumour Markers. Tumour markers alone cannot be used to assess objective tumour response. If markers are 
initially above the upper normal limit, however, they must normalize for a patient to be considered in complete 
response.   

Cytology, Histology. These techniques can be used to differentiate between PR and CR in rare cases if required 
by protocol (for example, residual lesions in tumour types such as germ cell tumours, where known residual 
benign tumours can remain). When effusions are known to be a potential adverse effect of treatment (e.g. 


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with certain taxane compounds or angiogenesis inhibitors), the cytological confirmation of the neoplastic origin 
of any effusion that appears or worsens during treatment when the measurable tumour has met criteria for 
response or stable disease is advised to differentiate between response or stable disease and progressive 
disease. 
B.2 
Tumour response evaluation 
All patients will have their BEST RESPONSE from the start of study treatment until the end of treatment classified as 
outlined below: 
Complete or partial responses may be claimed only if the criteria for each are met at a subsequent time point at least 
4 weeks later.  Refer to the table B1and table B2 below. 
Complete Response (CR): disappearance of all target and non-target lesions and normalization of tumour markers. 
Pathological lymph nodes must have short axis measures < 10 mm (Note: continue to record the measurement even if 
< 10 mm and considered CR). Tumour markers must have normalized. Residual lesions (other than nodes < 10 mm) 
thought to be non-malignant should be further investigated (by cytology or PET scans) before CR can be accepted.  
Partial Response (PR): at least a 30% decrease in the sum of measures (longest diameter for tumour lesions and short 
axis measure for nodes) of target lesions, taking as reference the baseline sum of diameters. Non target lesions must 
be non-PD.  
Stable Disease (SD): Neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD taking as 
reference the smallest sum of diameters on study. 
Progressive Disease (PD): at least a 20% increase in the sum of diameters of measured lesions taking as references the 
smallest sum of diameters recorded on study (including baseline) AND an absolute increase of ≥ 5 mm. Appearance of 
new lesions will also constitute PD (including lesions in previously unassessed areas). In exceptional circumstances, 
unequivocal progression of non-target disease may be accepted as evidence of disease progression, where the overall 
tumour burden has increased sufficiently to merit discontinuation of treatment, for example where the tumour 
burden appears to have increased by at least 73% in volume (which is the increase in volume when all dimensions of a 
single lesion increase by 20%). Modest increases in the size of one or more non-target lesions are NOT considered 
unequivocal progression.  If the evidence of PD is equivocal (target or non-target), treatment may continue until the 
next assessment, but on further documentation, the earlier date must be used. 
Table B1: Integration of target, non-target and new lesions into response assessment 
Target Lesions 
Non-Target Lesions 
New Lesions 
Overall Response 
Best Response for this category also 
requires 
Patients with Target lesions ± non target lesions 
CR 
CR 
No 
CR 
Normalization of tumour markers 
All tumour nodes < 10 mm 
Documented at least once ≥ 4 weeks 
from baseline 
CR 
Non-CR/Non-PD 
No 
PR 
Documented at least once ≥ 4 weeks 
from baseline 
CR 
Not all evaluated 
No 
PR 
PR 
Non-PD/ not all evaluated 
No 
PR 
SD 
Non-PD/ not all evaluated 
No 
SD 
Not all evaluated 
Non-PD 
No 
NE 
PD 
Any 
Any 
PD 
Any 
PD 
Any 
PD 
Any 
Any 
Yes 
PD 
Patients with Non target lesions ONLY 
No Target 
CR 
No 
CR 
Normalization of tumour markers 
All tumour nodes < 10 mm 
Documented at least once ≥ 4 weeks 
from baseline 
No Target 
Non-CR/non-PD 
No 
Non-CR/ non-PD 


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No Target 
Not all evaluated 
No 
NE 
No Target 
Unequivocal PD 
Any 
PD 
No Target 
Any 
Yes 
PD 
Note: Patients with a global deterioration of health status requiring discontinuation of treatment without objective evidence of disease 
progression [or evidence of unequivocal disease progression] at that time should be reported as “symptomatic deterioration”. This is a 
reason for stopping therapy, but is NOT objective PD.  Every effort should be made to document the objective progression even after 
discontinuation of treatment. 
Complete or partial responses may be claimed only if the criteria for each are met at a subsequent time point at least 
4 weeks later.  The best overall response can be interpreted from Table B2. 
Table B2: Response assessment after subsequent scan 
Response: First time point 
Subsequent time point 
BEST overall response 
Also requires 
CR 
CR 
CR 
Normalization of tumour markers 
All tumour nodes < 10 mm 
CR 
PR 
SD, PD or PR (see comment*) 
CR 
SD 
SD provided minimum criteria for SD duration 
met, otherwise, PD 
CR 
PD 
SD provided minimum criteria for SD duration 
met, otherwise, PD 
CR 
NE 
SD provided minimum criteria for SD duration 
met, otherwise NE 
PR 
CR 
PR 
PR 
PR 
PR 
PR 
SD 
SD 
PR 
PD 
SD provided minimum criteria for SD duration 
met, otherwise, PD 
PR 
NE 
SD provided minimum criteria for SD duration 
met, otherwise NE 
NE 
NE 
NE 
* may consider PR providing initial “CR” likely PR on subsequent review – then original CR should be corrected.  Recurrence of lesion after true CR is 
PD. 
B.2.1 
Frequency of tumour re-evaluation 
Participants will receive CT scans at baseline and at 24 weeks after the start of treatment as per standard treatment. 
B.2.2 
Date of progression 
This is defined as the first day when the RECIST (version 1.1) criteria for PD are met.  
B.3 
Reporting of tumour response 
All patients included in the study must be assessed for response to treatment, even if there is a major protocol treatment 
deviation or if they are ineligible, or not followed/re-evaluated. Each patient will be assigned one of the following 
categories: complete response, partial response, stable disease, progressive disease, early death from malignant 
disease, early death from toxicity, early death from other cause or unknown (not assessable, insufficient data). 


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Early death is defined as any death occurring before the first per protocol time point of tumour re-evaluation. The 
responsible investigator will decide if the cause of death is malignant disease, toxicity or other cause. 
Patients for whom response is not confirmed will be classified as "unknown", unless they meet the criteria for stable 
disease (or the criteria for partial response in case of an unconfirmed complete response). Patients’ response will also 
be classified as "unknown" if insufficient data were collected to allow evaluation per these criteria. 
33 APPENDIX C: RTOG LATE TOXICITY SCORE 
Please refer to 
http://www.rtog.org/ResearchAssociates/AdverseEventReporting/RTOGEORTCLateRadiationMorbidityScoringSchema.aspx
Grade 0 
Grade 1 
Grade 2 
Grade 3 
Grade 4 
Grade 5 
Lung 
None
Asymptomatic 
or mild 
symptoms (dry 
cough) 
Slight 
radiographic 
appearances
Moderate 
symptomatic 
fibrosis or 
pneumonitis 
(severe cough)
Low grade 
fever 
Patchy 
radiographic 
appearances
Severe 
symptomatic 
fibrosis or 
pneumonitis 
Dense 
radiographic 
changes
Severe 
respiratory 
insufficiency/ 
Continuous 
O2/ Assisted 
ventilation
Death 
Heart 
None
Asymptomatic 
or mild 
symptoms 
Transient T 
wave inversion 
& ST changes 
Sinus 
tachycardia 
>110 (at rest)
Moderate 
angina on 
effort 
Mild 
pericarditis 
Normal heart 
size 
Persistent 
abnormal T 
wave and ST 
changes 
Low ORS
Severe angina 
Pericardial 
effusion 
Constrictive 
pericarditis 
Moderate heart 
failure 
Cardiac 
enlargement 
EKG 
abnormalities
Tamponade/ 
Severe heart 
failure/ Severe 
constrictive 
pericarditis
Death 
Oesophagus 
None
Mild fibrosis 
Slight difficulty 
in swallowing 
solids 
No pain on 
swallowing
Unable to take 
solid food 
normally 
Swallowing 
semi-solid food
Dilatation may 
be indicated
Severe fibrosis 
Able to swallow 
only liquids 
May have pain 
on swallowing 
Dilation 
required
Necrosis/ 
Perforation 
Fistula
Death 
34 APPENDIX D: MELLOW DYSPHAGIA SCORE 
0 = able to eat normal diet / no dysphagia. 
1 = able to swallow some solid foods 
2 = able to swallow only semi solid foods 
3 = able to swallow liquids only 
4 = unable to swallow anything / total dysphagia 


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35 APPENDIX E: PROTOCOL AMENDMENT HISTORY 
Amendment No.
Protocol 
Version No. 
Date issued 
Author(s) of 
changes 
Details of Changes made 
001 
V3.0 
13Dec2016 
Maria 
Hawkins, 
Claire 
Hamill, 
Stephanie Levy. 
Protocol V1.0 28Jun2016 REC approved 
19Aug2016.  
The MHRA and OCTO chemotherapy, 
pharmacy advisory service (CPAS) initial 
reviews required changes to protocol 
V1.0 which updated the protocol to V2.0 
10Aug2016. Version 2.0 received MHRA 
approval 19Aug2016. This was then 
submitted to the REC as a substantial 
amendment 
with 
additional 
minor 
amendments updating the document to 
V3.0 13Dec2016. 
002 
V4.0 
14May2018 
Stephanie Levy 
IMP name change from VX-970 to M6620 
(Berzosertib). 
Change 
in 
IMP 
manufacturer. 
Additional 
secondary 
endpoint to Stage A2. Change to 
definition 
of 
end 
of 
study. 
DLT 
specification updated. Additional minor 
clarifications or corrections. 
004 
V5.0 
26Oct2020 
Maria 
Hawkins,  
Jane Holmes, Alex 
Ooms, 
Evan 
Ridgeon, 
Usha 
Wahengbam, Steph 
Levy 
Significant design changes to Stage B, 
including confirmed dose, treatment 
levels, 
follow 
up 
duration, 
and 
escalation/recruitment process. Change 
in end of trial timepoint, final report, 
pregnancy 
follow 
up. 
Flexibility 
in 
recruitment gaps. PK sampling removed. 
Eligibility criteria updates. Remove use of 
carboplatin. Stage A1 archival biopsy 
added. RSI update. Updates per IB & 
SmPCs. DLT added, DLT amended & 
clarity on treatment of patients with 
DLTs. Hb values corrected. Flexibility in 
assessments & treatment. RTTQA update. 
Administrative changes. 

SAP_001.pdf: 
______________________________________          
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Author: Alexander Ooms, Jane Holmes 
Page 1 of 25
A phase I dose escalation safety study combining the ATR inhibitor 
M6620 with chemoradiotherapy in oesophageal cancer & other 
solid cancers using time to event continual reassessment method 
Statistical Analysis Plan 
Version 2.0 – 07 January 2021 
Based on Protocol version V5.0 – 26 October 2020
Trial registration: 2015-003965-27 (EudraCT) 
Role 
Name 
Title   
Author 
Alexander Ooms 
Trial Statistician 
Author/Approver 
Jane Holmes 
Senior Trial Statistician 
Reviewer 
Maria Hawkins 
Chief Investigator 
Oncology Clinical Trials Office (OCTO), 
Oxford Clinical Trials Research Unit (OCTRU) & 
Centre for Statistics in Medicine (CSM)


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 2 of 25
CONTENTS 
INTRODUCTION ............................................................................................................................... 4
1.1
KEY PERSONNEL ...................................................................................................................................................... 4
1.2
CHANGES FROM PREVIOUS VERSION OF SAP ................................................................................................................ 5
BACKGROUND AND OBJECTIVES ....................................................................................................... 6
2.1
BACKGROUND AND RATIONALE .................................................................................................................................. 6
2.2
OBJECTIVES ........................................................................................................................................................... 7
STUDY METHODS ............................................................................................................................. 9
3.1
TRIAL DESIGN/FRAMEWORK ..................................................................................................................................... 9
3.1.1
General description of the TiTE-CRM design ................................................................................................ 9
3.1.1
Stage A1 ...................................................................................................................................................... 11
3.1.2
Stage A2 ...................................................................................................................................................... 12
3.1.3
Stage B ........................................................................................................................................................ 13
3.2
DOSE ALLOCATION ................................................................................................................................................ 14
3.3
STOPPING RULES FOR TOXICITY ................................................................................................................................ 14
3.4
SUMMARY OF TRIAL DESIGN FOR ALL STAGES .............................................................................................................. 14
3.5
RANDOMISATION AND BLINDING ............................................................................................................................. 17
3.6
SAMPLE SIZE ........................................................................................................................................................ 17
3.6.1
Operating Characteristics of the Trial ............................................................. Error! Bookmark not defined.
3.7
STATISTICAL INTERIM ANALYSIS, DATA REVIEW AND STOPPING GUIDELINES ..................................................................... 17
3.8
TIMING OF FINAL ANALYSIS .................................................................................................................................... 17
3.9
BLINDED ANALYSIS ................................................................................................................................................ 17
3.10
STATISTICAL ANALYSIS OUTLINE ............................................................................................................................... 17
TREATMENT INTERVENTIONS ......................................................................................................... 17
4.1
STAGE A1 TREATMENT .......................................................................................................................................... 17
4.1.1
M6620 treatment schedules – Stage A1 ..................................................................................................... 17
4.2
STAGE A2 TREATMENT .......................................................................................................................................... 18
4.2.1
M6620 Treatment Schedule – Stage A2 ..................................................................................................... 18
4.3
STAGE B TREATMENT ............................................................................................................................................ 19
4.3.1
M6620 Treatment Dose and Schedule – Stage B ........................................................................................ 19
STATISTICAL PRINCIPLES................................................................................................................. 19
5.1
STATISTICAL SIGNIFICANCE AND MULTIPLE TESTING ..................................................................................................... 19
5.2
DEFINITION OF ANALYSIS POPULATIONS .................................................................................................................... 19
TRIAL POPULATION AND DESCRIPTIVE ANALYSES ........................................................................... 20
6.1
REPRESENTATIVENESS OF STUDY SAMPLE AND PATIENT THROUGHPUT ............................................................................ 20
6.2
WITHDRAWAL FROM TREATMENT AND/OR FOLLOW-UP ............................................................................................... 22
6.2.1
Treatment Withdrawal ............................................................................................................................... 22
6.2.2
Consent Withdrawal ................................................................................................................................... 22
6.3
BASELINE COMPARABILITY OF RANDOMISED GROUPS .................................................................................................. 22
6.4
UNBLINDING ........................................................................................................................................................ 22
6.5
DESCRIPTION OF COMPLIANCE WITH INTERVENTION .................................................................................................... 22
6.6
RELIABILITY .......................................................................................................................................................... 23
ANALYSIS ....................................................................................................................................... 23
7.1
OUTCOME DEFINITIONS ......................................................................................................................................... 23
7.2
ANALYSIS METHODS .............................................................................................................................................. 23
7.2.1
Primary Outcome (All Stages) ..................................................................................................................... 23
7.2.2
Secondary Outcomes .................................................................................................................................. 23


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 3 of 25
7.2.3
Tertiary Outcomes (Stage A2 and B) ........................................................................................................... 24
7.3
MISSING DATA ..................................................................................................................................................... 24
7.4
SENSITIVITY ANALYSIS ............................................................................................................................................ 24
7.5
PRE-SPECIFIED SUBGROUP ANALYSIS ........................................................................................................................ 25
7.6
SUPPLEMENTARY/ ADDITIONAL ANALYSES AND OUTCOMES .......................................................................................... 25
7.7
HEALTH ECONOMICS AND COST EFFECTIVENESS (WHERE APPLICABLE) ............................................................................. 25
7.8
META-ANALYSES (IF APPLICABLE) ............................................................................................................................. 25
VALIDATION OF THE PRIMARY ANALYSIS ........................................................................................ 25
SPECIFICATION OF STATISTICAL PACKAGES ..................................................................................... 25
REFERENCES .................................................................................................................................. 25
APPENDIX: GLOSSARY OF ABBREVIATIONS ............................................................................................. 25


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 4 of 25
INTRODUCTION 
This document details the proposed presentation and analysis for the main paper(s) reporting results from the 
CRUK, Merck and The University of Oxford-funded multicentre phase I dose escalation safety study 
combining the ATR inhibitor M6620 with chemoradiotherapy in oesophageal cancer using time to event 
continual reassessment method (CHARIOT).  The results reported in these papers should follow the strategy 
set out here.  Subsequent analyses of a more exploratory nature will not be bound by this strategy, though 
they are expected to follow the broad principles laid down here.  The principles are not intended to curtail 
exploratory analysis (for example, to decide cut-points for categorisation of continuous variables), nor to 
prohibit accepted practices (for example, data transformation prior to analysis), but they are intended to 
establish the rules that will be followed, as closely as possible, when analysing and reporting the trial.  
The analysis strategy will be available on request when the principal papers are submitted for publication in a 
journal.  Suggestions for subsequent analyses by journal editors or referees, will be considered carefully, and 
carried out as far as possible in line with the principles of this analysis strategy; if reported, the source of the 
suggestion will be acknowledged. 
Any deviations from the statistical analysis plan will be described and justified in the final report of the trial.  
The analysis should be carried out by an identified, appropriately qualified and experienced statistician, who 
should ensure the integrity of the data during their processing.  Examples of such procedures include quality 
control and evaluation procedures. 
1.1
Key personnel 
Author(s) (Trial statistician(s)): Alexander Ooms
  
Medical Statistician 
Centre for Statistics in Medicine 
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal 
Sciences 
 
The University of Oxford 
 
Windmill Road 
Oxford OX3 7LD 
Tel.: 01865 737867 
Email: alexander.ooms@ndorms.ox.ac.uk
Jane Holmes 
Medical Statistician 
Centre for Statistics in Medicine 
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal 
Sciences 
The University of Oxford 
Windmill Road 
Oxford OX3 7LD 
Tel.: 01865 223452 
 Email: jane.holmes@csm.ox.ac.uk


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 5 of 25
Reviewers (Chief Investigator): Maria Hawkins 
Professor in Radiation Oncology 
Medical Physics and Biomedical Engineering  
Malet Place Engineering Building  
University College London 
Gower Street 
London, WC1E 6BT 
Tel: 020 8138 7633 
m.hawkins@ucl.ac.uk
Approver (Senior Medical Statistician): 
1.2
Changes from previous version of SAP 
A summary of key changes from earlier versions of SAP, with particular relevance to protocol changes that 
have an impact on the design, definition, sample size, data quality/collection and analysis of the outcomes 
will be provided. Include protocol version number and date. 
Version number
Issue date 
Author of 
this issue 
Protocol Version & Issue 
date 
Significant changes from 
previous version together with 
reasons 
V1.0_10Jul2018
Eleni Frangou
Jane Holmes 
Protocol_V4.0_14May2018
Not applicable as this is the 1st
issue 
V2.0_07Jan2021
Alexander 
Ooms 
Jane Holmes 
Protocol_V5.0_26Oct2020

Updated to be based on 
V5.0 of the protocol 

Simulation results moved 
to an Appendix 1 
Document 

Reference made to 
Protocol Decision Point 
Plan and clarification of 
dose decisions 

Change in TiTE CRM’s 
weight function 

Change in sensitivity 
analyses presented at each 
dose decision 

Removal of references to 
Stage B  
Note: All references to Stage B’s dose allocation methods have been removed from V2.0 of this Analysis Plan. This is to 
facilitate dose decisions for Stages A1 and A2 to be based on a finalised SAP while the analysis methods for the 
redesigned Stage B in V5.0 of the protocol are being considered. This Analysis Plan will be updated to include Stage B’s 
planned analysis methods prior to Stage B opening to recruitment. 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 6 of 25
BACKGROUND AND OBJECTIVES 
2.1
Background and rationale  
This phase I study will test the combination of a novel ATR inhibitor (M6620) with chemoradiotherapy in 
oesophageal cancer. In the first two cohorts (Stage A1 and A2), we will investigate the safety of combining 
M6620 separately with [1] palliative radiotherapy (RT) for oesophageal cancer (Stage A1) and [2] with 
cisplatin/capecitabine chemotherapy in patients with advanced inoperable and metastatic solid tumours 
(Stage A2). In Stage A1, M6620 will be given in combination with high dose palliative RT treatment, aiming to 
deliver M6620 twice weekly during RT escalating to a dose of 240mg/m2. A palliative chemotherapy cohort 
(Stage A2) will open to recruitment simultaneously where M6620 will be given in combination with 
cisplatin/capecitabine chemotherapy, aiming to deliver M6620 twice weekly escalating to a dose of 140mg/m2 
twice weekly. When we have enough information to suggest the combinations are tolerable, the ATR inhibitor 
will be tested in the definitive setting (Stage B) in combination with cisplatin/capecitabine and radical RT to 
identify the MTD.  The MTD found in this study will be taken forward in future phase II studies. 
In the palliative setting, we aim to find the schedule associated with no more than 25% Dose Limiting Toxicities 
(DLTs) in stage A1 on the basis that palliative oesophageal radiotherapy causes approximately 20% grade 3 
and 4 toxicity, and 30% Dose Limiting Toxicities (DLTs) in stage A2 are derived from capecitabine/cisplatin used 
in the radical setting (SCOPE1 study). 
In the radical setting, we aim to find the schedule associated with no more than 45% DLTs on the basis that 
conventional oesophageal chemoradiation causes a grade 3 and 4 toxic event rate of 28% haematological 
toxicity and 63% non-haematological toxicity of which 34% is gastrointestinal as reported in the standard arm 
of SCOPE1 study (12). Comparable toxicity rates were described in the standard arm of the 
PRODIGE5/ACCORD17 study: grade 3 and 4 neutropenia 29% and grade 3 and 4 dysphagia and oesophagitis 
33%. 
The trial will find the best optimal dose and dosing schedule using the TiTE-CRM (Time To Event Continual 
Reassessment Method). The CRM is a model based method for finding the MTD. It assumes that toxicity 
increases monotonically with increasing dose, and that efficacy also increases with increasing dose. The aim 
will be to find the dose that causes a DLT with the above specified target toxicity levels. TiTE-CRM is a modified 
CRM that accounts for the time to event of late onset toxicities. The advantages of a TiTE-CRM are that all 
current information is used when deciding which dose to give the next patient and it is not necessary for a 
patient to complete the full observation period before consenting the next patient. This results in a better 
estimation of the MTD and shorter study duration respectively. 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 7 of 25
2.2
Objectives 
Stage A2 
Primary Objective 
Endpoints/ Outcome Measures 
Time point(s) for 
evaluation of end 
point  

To determine the best tolerated M6620 
treatment schedule (or phase II 
recommended dose (RPTD)) 
administered concomitantly with 
chemotherapy (Cisplatin and 
Capecitabine) only in the palliative 
treatment of solid cancer 

Highest treatment schedule resulting in 
less than 30% dose limiting toxicity 
(DLT) rate (see section 9.1.2 for DLT 
definitions) 

Week 4 
Secondary Objectives 
Endpoints/ Outcome Measures 

To determine the safety and toxicity 
profile of M6620 administered 
concomitantly with chemotherapy 
(Cisplatin and Capecitabine) only in the 
palliative treatment of solid cancer 

Any toxicity grade ≥3 graded according 
to CTCAE v4.03 and length of time for 
toxicity to resolve 

During 
chemotherapy  
Week 1-18 

Week 20, 26 
Stage A1 
Primary Objective 
Endpoints/ Outcome Measures 
Time point(s) for 
evaluation of end 
point  

To determine the best tolerated M6620 
treatment schedule (or phase II 
recommended dose (RPTD)) 
administered concomitantly with 
Radiotherapy only in the palliative 
treatment of oesophageal cancer 
Highest treatment schedule resulting in less 
than 25% dose limiting toxicity (DLT) rate 
(see section 9.1.2 for DLT definitions) 

Week 9 
Secondary Objectives 
Endpoints/ Outcome Measures 

To determine the safety and toxicity 
profile of M6620 administered 
concomitantly with RT only in the 
palliative treatment of oesophageal 
cancer 

Any toxicity grade ≥3 graded according 
to CTCAE v4.03 and length of time for 
toxicity to resolve 

During 
radiotherapy 
Weeks 1-3 

Week 4, 9 and 
week 12 

To determine if M6620 can be 
delivered in combination with palliative 
RT  

Proportion of patients completing at 
least 75%, 90% and 100% of the planned 
RT dose 

End of 
radiotherapy End 
of Week 3 

Efficacy of the combination 

Objective tumour response (OR) as 
evaluated by CT scan and quantified by 
Response Criteria Evaluation (RECIST 
1.1)  

PFS and OS from D1 

In field radiotherapy control 

12 weeks 

6 and 12 months 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 8 of 25

To determine if M6620 can be 
delivered in combination with palliative 
chemotherapy 

Proportion of patients completing at 
least 75%, 90% and 100% of the 
planned dose 

End of 
chemotherapy 
Week 18 

Efficacy of the combination 

Objective tumour response (OR) as 
evaluated by CT scan and quantified by 
Response Criteria Evaluation (RECIST 
1.1)  

PFS and OS from D1 

Week 6, 12, 18, 26 

Week 26 & 12 
months 
Tertiary Objectives 
Endpoints/ Outcome Measures 

To evaluate pharmacokinetics (PK) of 
M6620 when administered in 
combination with Cisplatin and 
Capecitabine  

M6620 Cmax (observed peak plasma 
concentration) and AUC (area under the 
plasma concentration time curve) using 
blood samples when delivered after 
Capecitabine and Cisplatin 
administration 

1st dose of M6620 
(C1D2) at the 
following 
timepoints: BOI, at 
0.5 hours before 
EOI, at EOI and at 
0.5, 1, 2, 3, 6, 23, 
47 hours after EOI.  
For C1D9 and 
C1D16 doses at 
the following 
timepoints: BOI 
and EOI  
Stage B 
Primary Objective 
Endpoints/ Outcome measures 
Time point(s) for 
evaluation of end 
point  

To determine the best tolerated M6620 
treatment schedule (or phase II 
recommended dose (RPTD)) 
administered concomitantly with 
radiotherapy (dCRT) in combination 
with cisplatin and capecitabine in the 
radical treatment of oesophageal cancer 
Highest treatment schedule resulting in less 
than 45% dose limiting toxicity (DLT) rate 
(see section 9.1.2 for DLT definitions) 

Up to Week 24 
Secondary Objectives 
Endpoints/ Outcome Measures 

To determine the safety and toxicity 
profile of M6620 administered 
concomitantly with dCRT in 
combination with cisplatin and 
capecitabine in the radical treatment of 
oesophageal cancer 

Any toxicity grade ≥3 graded according 
to CTCAE v4.03 and length of time for 
toxicity to resolve 

Up to week 24 

To determine tolerance and ability to 
deliver M6620 in combination with 
standard dCRT  

Treatment tolerance and deliverability 
measured by proportion of patients 
completing at least 80% of the planned 
chemotherapy dose and at least 20 
fractions of RT 

End of induction 
chemotherapy and 
dCRT. End of week 
11 

Efficacy and long term safety of the 
combination 

Objective tumour response (OR) as 
evaluated by CT scan and quantified by 

24 weeks 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 9 of 25
Response Criteria Evaluation (RECIST 
1.1) and endoscopic and biopsy 
findings. 

PFS and OS from D1 
Tertiary/Exploratory Objectives 
Endpoints/ Outcome Measures 

To explore target effects in tissue 

Change in level of ATR inhibition and 
apoptosis in M6620 treated tissue 
using IHC. 

Genotyping of tumours 

Aim to identify markers for 
oesophageal cancer in the blood 

Biopsies at 
baseline, week 7 
and 24

Blood samples at 
baseline, week 7 
and week 12 
STUDY METHODS
3.1
Trial Design/framework 
This will be a single arm, open-label, phase I dose escalation trial using the Time-To-Event Continual 
Reassessment Method (TiTE-CRM) to find the optimal treatment schedule. The trial consists of three stages 
A1, A2 and B. Stages A1 and A2 will run concurrently and will inform the starting dose of M6620 for Stage B. 
3.1.1 General description of the TiTE-CRM design 
The TiTE-CRM method is a modified version of the CRM that accounts for late-onset toxicities. It uses all 
current information when deciding which dose to give the next patient and it is not necessary for a patient to 
complete the full observation period before consenting the next patient. This results in a better estimation of 
the MTD and shorter study duration respectively and is particularly useful in trials involving radiotherapy 
where the toxicity follow-up phase is longer. We assume that: 

A maximum of N subjects are to be recruited 

A target toxicity level, TTL 

K doses d1, … dK to be explored 

A DLT window of length T 

The maximum amount of dose of M6620 for the patient’s allocated treatment schedule D 

A weight function, ࢝,  associated with T and D denoting a combination of the proportion of the DLT 
window that has been observed and proportion of the total M6620 they’re to receive for each 
currently enrolled patient  

Prior estimates of DLTs at each dose, also called the skeleton, ࣊ෝ૙= {ߨො଴ଵ, … , ߨො଴௄}

Dose toxicity curve (DTC), ݃௞(ߙ) = ݀௞
௘௫௣ഀ

Prior distribution for the parameter of the DTC, ߙ~N(0, σଶ)


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 10 of 25
At the start of the trial the information on the probability of DLT at each dose level is given by the prior 
estimates  ࣊ෝ૙. These estimates are updated after every patient to give the posterior estimates. 
Suppose there are J subjects currently enrolled, the available information is the set of doses {ݔଵ, … , ݔ௃}
administered to the J patients, the set of toxicity outcomes {ݕଵ, … , ݕ௃} where ݕ௝= 0 if no toxicity and ݕ௝= 1
if toxicity, and the amount of time each patient has been observed ൛ݑଵ, … , ݑ௃ൟ, where 0 ≤ݑ௝≤ܶ. The amount 
of M6620 given per dose schedule ൛ݒଵ, … , ݒ௃ൟ, where 0 ≤ݒ௝≤ܦ. 
The TiTE-CRM model uses a weighted likelihood function given by  
ܮ(ߙ) = ෑቂ݃௫ೕ(ߙ) ∗ݓ௝ቃ
௬ೕቂ1 −݃௫ೕ(ߙ) ∗ݓ௝ቃ
ଵି௬ೕ
௃
௝ୀଵ
where 
ݓ௝= ቊ
1 if ݕ௝= 1
భ
మቆ
ೠೕ
೅శ
ೡೕ
ವቇ if ௬ೕୀ଴
and the posterior expected toxicity at each dose (posterior dose-toxicity curve) is given by 
ߨො௞= ܧ(݃௞(ߙ)|ݕ) = න
݃௞(ߙ)݌(ߙ|ݕ)݀ߙ
ஶ
ିஶ
The MTD is defined to be the dose ݔ∗ such that ߨො௞= ܶܶܮ. As each new patient is enrolled, the current best 
guess at the MTD is calculated based on all data accrued so far, and is the dose suggested for the patient in 
agreement with the TMG. 
In addition the trial may be stopped early if either the drug is found to be too toxic or we are confident in our 
estimate of the MTD. The flow of patients through a CRM trial is given in Figure 1. 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 11 of 25
Figure 1: Flow of patients through a CRM trial 
3.1.1 Stage A1 
The aim is to find the M6620 treatment schedule when combined with radiotherapy that is associated with 
no more than 25% dose limiting toxicity rate on the basis that palliative oesophageal radiotherapy is associated 
with approximately 15-20% grade 3/4 toxicity. Six treatment schedules are proposed.  Each schedule 
comprises a specific combination of dose and dosing frequency. There are two possible M6620 doses and 
three dosing frequencies (see section 4.1.1). The radiation dose remains consistent across all treatment 
schedules. For the prior estimates of DLT at each treatment schedule, see the skeleton in Table 1.  
The treatment involves 3 weeks of daily radiotherapy and M6620 at a pre-determined frequency dependent 
on the treatment schedule allocated to the individual patient. The follow-up of a further 6 weeks provides a 
DLT observation window of a total of 9 weeks. An initial cohort of three patients will receive the starting 
schedule (lowest dosing frequency) at the starting dose, 140mg/m2. The fourth patient will not be recruited 
until all three patients have been followed for the minimum of 9 weeks from the start of radiotherapy or the 
occurrence of a DLT. 
Subsequently, all eligible patients will be continuously recruited and the TiTE-CRM will be used to assign their 
treatment schedule. To ensure enough information is accumulated to inform the assignment of the treatment 
schedule to the subsequent patient, recruitment will be managed through allocation of treatment slots (see 
Protocol section 4.4 for further details). 
Stage A1 stopping rules 
Enrol 1st cohort of patients 
Stopping rules 
satisfied? 
Analyse  
(Update DTC) 
Assign next patient to 
current estimate of 
MTD 
No 
Yes 
STOP 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
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SAP Authors: Alexander Ooms, Jane Holmes 
Page 12 of 25
Stage A1 will pause for safety if, at any point in the trial, there is sufficient evidence to suggest that schedule 
1 is too toxic. More specifically, we will consider schedule 1 to be too toxic if, given all the available data, there 
is a high probability that the DLT rate is greater than the target toxicity level of 0.25. If all 3 patients in the first 
cohort have DLTs then schedule 1 is too toxic and the trial will be re-started. At this point, three extra schedules 
will be introduced at 90mg/m2 and varying dosing frequencies, namely (schedule -3, -2 and -1). Once the trial 
is restarted, the lowest schedule, schedule -3, will be explored first. There will then be 9 treatment schedules 
to explore (the original 6 plus the 3 dosing frequencies at the lower dose). If the first 3 patients recruited to 
schedule -3 experience DLTs then the trial will stop. If schedule 1 is found to be too toxic later in the trial when 
more than 3 patients have been recruited, a SRC meeting will be convened to decide whether the trial should 
be restarted using the lower dose of 90mg/m2. 
Stage A1 will stop for success when either a total of 10 patients have been assigned to a particular treatment 
schedule or 20 patients have been recruited, whichever occurs first. When 10 patients in Stage A1 have been 
assigned to a particular treatment schedule, recruitment will be paused until there are no more than three 
patients without full follow-up (either DLT or 6 weeks after the end of treatment), i.e. until there is full follow-
up information on at least seven patients. If the MTD changes, recruitment may start again. 
Based on simulations and assuming a patient will be recruited every 8 weeks, the average number of patients 
required for Stage A1 is 18, which we aim to recruit in 24 months.  
3.1.2 Stage A2  
The aim is to find the M6620 treatment schedule when combined with palliative combination chemotherapy 
(Cisplatin and Capecitabine) that is associated with no more than a 30% dose limiting toxicity rate. Four 
treatment schedules are proposed. Each schedule comprises a specific combination of dose and dosing 
frequency. There are two possible M6620 doses and two dosing frequencies (see section4.2.1). Chemotherapy 
dose remains consistent across all treatment schedules. For the prior estimates of DLT at each treatment 
schedule see the skeleton in Table 1.  
The treatment involves six cycles of chemotherapy with three weekly Cisplatin and Capecitabine and M6620 
at a pre-determined frequency dependent on the treatment schedule allocated to the individual patient. The 
follow-up of a further 8 weeks provides a total observation window of 26 weeks. DLT assessments will be 
carried out during the first 4 weeks of treatment. The MTD will be determined during this period using the 
TiTE-CRM. An initial cohort of three patients will receive the starting schedule (lowest dosing frequency) at 
the starting dose. The fourth patient will not be recruited until all three patients have been followed for a 
minimum of 4 weeks from the start of chemotherapy or until the occurrence of a DLT. 
From the fourth patient, all eligible patients will be continuously recruited and the TiTE-CRM will be used to 
assign their treatment schedule. To ensure enough information is accumulated to inform the assignment of 
the treatment schedule to the subsequent patient, recruitment will be managed by allocating treatment slots 
(see Protocol section 4.4 for further details). 
Stage A2 stopping rules 
Stage A2 will stop for safety if, at any point in the trial, there is sufficient evidence to suggest that schedule 1 
is too toxic. More specifically, we will consider schedule 1 to be too toxic if, given all the available data, there 
is a high probability that the DLT rate is greater than the target toxicity level of 0.3. If the first three patients 
recruited to Stage A2 have DLTs at treatment schedule 1, then the starting schedule (treatment schedule 1) 
will be deemed too toxic and the trial will stop. 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 13 of 25
The trial will stop for success when either six patients have been assigned to the fourth treatment schedule 
(140 mg/m2 of M6620 twice weekly) or 20 patients in total have been recruited, whichever occurs first. When 
six patients in Stage A2 have been assigned to the fourth treatment schedule, recruitment to Stage A2 will be 
paused until there is full follow-up information on at least five patients. If the MTD has changed, recruitment 
to Stage A2 may start again.  
Based on simulations and assuming a patient will be recruited every 3 weeks, the average number of patients 
required for Stage A2 is 16, which we aim to recruit in 12 months.  
3.1.3 Stage B 
The aim is to find the M6620 treatment schedule when combined with chemoradiotherapy that is associated 
with no more than 45% dose limiting toxicity rate on the basis that conventional oesophageal chemoradiation 
causes a grade 3 and 4 toxic event rate of 28% haematological toxicity and 63% non-haematological toxicity, 
of which 34% is gastrointestinal, as reported in the standard arm of the SCOPE1 study.  Comparable toxicity 
rates were described in the standard arm of the PRODIGE5/ACCORD17 study: grade 3 and 4 neutropenia 29% 
and grade 3 and 4 dysphagia and oesophagitis 33%. A maximum of 25 patients will be recruited to Stage B.  
There are three proposed M6620 treatment schedules (same dose but increasing dosing frequencies, section 
4.3.1) to be explored during Stage B. M6620 treatment schedule assignment will occur prior to the start of 
chemoradiotherapy 6 weeks after a patient is recruited. This will maximise the accumulation of information 
on each patient before deciding on the treatment schedule for the subsequent patient.  
The dose of M6620 (Berzosertib) in Stage B will be 140mg/m2, allocation will start on schedule 1, which is 
the middle of the 3 schedules. Recruitment will be continuous; however, escalation will not occur until at 
least one patient full DLT window of 24 weeks is complete. At this point escalation to schedule 2 will be 
possible if it is estimated to be safe, and dose decisions thereafter will be made once each new patient is 
recruited and confirmed (if there is reason to think their allocation may have changed) when they have been 
treated for 6 weeks (the induction period which is the same for all schedules). De-escalation to schedule -1 is 
possible at any point in the trial. Although recruitment will be continuous, the TMG retain the option to 
pause recruitment should they decide more follow-up data is needed before continuing. This may be, for 
example, to prevent too many patients being treated with a sub-optimal, or too toxic, schedule. No more 
than 7 patients will be treated on schedule 1 before there is full follow-up data on at least one patient.  The 
starting dose of M6620 in Stage B will be 140mg/m2 if both A1 and A2 recommend 140mg/m2 otherwise it 
will be 90mg/m2. 
We will recommend starting stage B: 
- If 10 patients have been recruited to A1 and it has not restarted at the lower dose 
- If 10 patients have been assigned to at least schedule 3 in A2 (i.e. are on any of the schedules with a dose 
of 140mg/m2) or the stopping rule is satisfied (6 treated on schedule 4) 
If one of the above starting rules are satisfied then an SRC meeting will be convened to review the data and 
may recommend starting stage B.  
Stage B stopping rules 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
to event continual reassessment method (funded by CRUK and Merck)  
EudraCT Number: 2015-003965-27 
______________________________________    
SAP Version No: 1.6 
OCTRU-OST-001_V3.0_16Feb2018 
Date: 17Dec2020 
Effective Date 23Feb2018 
SAP Authors: Alexander Ooms, Jane Holmes 
Page 14 of 25
Stage B will stop for safety if, at any point in the trial, there is sufficient evidence to suggest that schedule -1 
is too toxic. More specifically, we will consider schedule -1 to be too toxic if, given all the available data, there 
is a high probability that the DLT rate is greater than the target toxicity level of 0.45. There will be no early 
stopping rules for success. We expect to recruit a minimum of 15 patients. 
3.2
Dose allocation 
The trial design ensures no treatment schedule skipping and the treatment schedule assigned will be that 
estimated to be closest to but not above the target toxicity level (TTL). However, if the lowest schedule is 
estimated to be above the TTL we will keep assigning the lowest schedule until we are certain it is too toxic, 
at which point the trial may start again using a lower dose of drug. When escalating, the treatment schedule 
can only increment by one level if escalating to an untried schedule, but there will be no restriction on 
treatment schedule de-escalation. Each escalation decision will be made by the TMG based on the 
recommendation from the TiTE-CRM model and the accumulated experience of the recommended schedule. 
Full details of each dose decision are found in the Protocol Decision Point Plan (V1.0, 28Jun2019) but briefly: 
TMG to review the dose selected by the statistical model on the basis of the accumulated data and either: 

Confirm the selected dose or

Over-rule the selected dose and choose an alternative dose for the next participant & may convene a 
meeting of the Safety Review Committee (SRC) or

Agree to convene a meeting of the Safety Review Committee (SRC) for further input as the TMG is 
unable to reach a decision or
Agree that a protocol defined stopping rule has been met and that the trial should be stopped.
3.3
Stopping rules for toxicity 
The same stopping rule for safety applies to all 3 stages of the study: each stage will stop for safety if, at any 
point in the stage, there is sufficient evidence to suggest that the lowest treatment schedule is too toxic. 
Specifically, within a particular stage, the lowest schedule will be considered too toxic if, given all the available 
data, there is a high probability that the DLT rate is greater than the target toxicity level for that stage, i.e. if 
P(Toxicity at treatment lowest schedule > TTL | data) > 0.95. 
3.4
Summary of trial design for all stages 
The table summarises the design features of the design for stages A1 and A2, and Figure 1 shows the flow of 
patients through the trial. 
Table 1: Design features for all stages of the study 
Assumptions
A1
A2
B**
Target toxicity level
0.25
0.30
Maximum number of subjects
20
20
Number of treatment 
schedules 
6
4
Stopping rules
10 on a schedule
6 on schedule 4
Toxicity stopping rules
P(Toxicity at treatment schedule 1 > TTL | data) > 0.95
Definition of MTD
Treatment schedule that is closest to but not above the TTL
Dose escalation rules
No dose skipping when escalating, no restrictions on de-escalation
Dose toxicity curve
Power curve with prior N(0, 1.1582)
DLT window
9 weeks
4 weeks


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Number in first cohort*
3
3
Skeleton
0.12
0.15 
0.18 
0.20 
0.22 
0.25 
0.17
0.20 
0.25 
0.30 
* This is the number assigned the first treatment schedule
** Design features for Stage B omitted for this version of the SAP.  


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
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Stage A recruited patients. 
Stage A1 
Stage A2 
Stage B 
Recruitment 
paused for at least 
4 weeks from start 
of treatment of the 
3rd patient 
3 patients are recruited and assigned to  

Stage A1: Schedule 1  

Stage A2: Schedule 1 

*Stage B: Schedule 1 
The TMG reviews the output of the TiTE-
CRM model and decides on patient’s 
treatment plan assignment. If TMG 
disagrees with model, SRC will review 
the decision 
Patients are followed up for  
Stage A1 – 12 weeks 
Stage A2 – 26 weeks 
Stage B – 24 weeks 
Recruitment 
paused for at least 
9 weeks from start 
of treatment of the 
3rd patient. If all 
three patients 
have toxicities, 
Stage A1 will be 
re-started at a 
lower dose. 
Recruitment 
continuous but no 
escalation until 
full 24 week 
DLT window 
completed by 1 
participant. Max 
of 7 recruited in 
the 1st patient’s 
DLT.  
Recruitment is paused while enough 
information is acquired for these. 
*Stage B will start once: 
A1: 10 patients have been recruited to 
A1 and it has not restarted at the lower 
dose or 20 patients have been recruited. 
OR 
A2: 10 patients have been assigned to at 
least treatment schedule 3 or 6 on 
schedule 4 or the maximum of 20 patients 
have been recruited. 
There are no early success stopping rules 
for Stage B. The maximum number of 
participants that can be recruited is 25 
patients. 
Stage B MTD will be estimated at the end 
of follow up.
No dose 
skipping for 
dose escalation 
No restrictions 
for dose de-
escalation 
Check stopping and safety rules 
Stopping  
rule met:  
call SRC 
meeting 
Stop  
Trial 
Stopping  
rule  
not met 
Once a patient is ready to be recruited, 
run the TiTE-CRM model based on all 
the available information of the currently 
recruited patients. 
For stage B, patients 4-6 are assigned 
treatment schedule 1, and the TiTE-CRM 
model is used from patient 7 onwards. 
Figure 2: Trial Flow Chart


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3.5
Randomisation and Blinding 
CHARIOT is not a randomised trial and is open labelled.
3.6
Sample Size 
Sample size estimates are based on 1,000 simulated TiTE‐CRM trials using the same characteristics that the 
actual trial will be based upon. The patients will not be replaced and the TiTE‐CRM will use all accumulated 
data. For Stage A1, to treat 10 patients at a particular treatment plan or reach a maximum of 20 patients, 18 
(95% C.I.: (10, 20)) patients are required. For Stage A2, to treat 6 patients at dosing schedule 4 or reach a 
maximum of 20 patients, 16 (95% C.I.: (11, 20)) are required.  
3.7
Statistical Interim Analysis, Data Review and Stopping guidelines 
This is a schedule finding trial and each time a patient is recruited, an interim analysis of the currently collected 
data will be performed to recommend the schedule of the newly recruited patient. See Section 3.1 for details. 
3.8
Timing of Final Analysis 
Based upon projected accrual rates, this trial (Stage A1, A2 and B) is expected to complete recruitment within 
30 months of opening to recruitment. Final analysis for Stage A will be after all patients have been followed 
up for at least 3 months in Stage A1 and 26 weeks in Stage A2 while for Stage B, it will be performed 24 weeks 
after Stage B last patient start of treatment. 
3.9
Blinded analysis 
No blinded analysis will be undertaken for this trial as the trial is not randomised and therefore blinded.
3.10 Statistical Analysis Outline 
Please refer to Section 3.1. 
TREATMENT INTERVENTIONS 
The trial is investigating the unlicensed drug M6620 in combination with the radiotherapy (stage A1); M6620 
in combination with chemotherapy agents Cisplatin and Capecitabine (stage A2) and M6620 with 
chemoradiotherapy (stage B). For the purposes of the trial, M6620, Cisplatin and Capecitabine are all 
considered IMPs. 
4.1
Stage A1 Treatment 
Two M6620 dose levels and 3 dosing frequencies (treatment schedules) are proposed. Both the dose and 
frequency of M6620 will vary but the administered radiation dose and fractionation schedule will remain 
unchanged across treatment plans. The treatment schedule will last for 3 weeks and radiotherapy must start 
on a Monday. 
4.1.1 M6620 treatment schedules – Stage A1 
The starting dose of M6620 will be 140mg/m2 IV once weekly (schedule 1).  If schedule 1 is too toxic, the trial 
will be re-started at 90mg/m2 (schedule -3). For all schedules, see Table 2. The treatment schedule of M6620 
will be escalated or de-escalated using the TiTE-CRM model. 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
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Table 2: Stage A1 - Dose Escalation Schedule 
Dose Escalation schedule 
Treatment 
schedule
Dose** of M6620 and days of the schedule it will be delivered
 -3 
90 mg/m2 day 2, 9, 16 
-2 
90 mg/m2 day 2, 5, 9, 12, 16 
-1 
90 mg/m2 day 2, 5, 9, 12, 16, 19 
1* 
140 mg/m2 day 2, 9, 16  
2 
140 mg/m2 day 2, 5, 9, 12, 16 
3 
140 mg/m2 day 2, 5, 9, 12, 16, 19 
4 
240 mg/m2 day 2, 9, 16 
5 
240 mg/m2 day 2, 5, 9, 12, 16 
6 
240 mg/m2 day 2, 5, 9, 12, 16, 19 
*Starting dose and schedule. 90mg/m2 dose will only be explored if trial is re-started 
**Doses are stated as exact dose in units. No intermediate dose levels or further splitting of the dose allowed
4.2
Stage A2 Treatment 
Two dose levels and 2 dosing frequencies (treatment schedules) are proposed. Both the dose and frequency 
of M6620 will vary but the Cisplatin and Capecitabine dose and schedule will remain unchanged across 
treatment plans. The treatment schedule will last for 6 cycles (18 weeks). 
4.2.1 M6620 Treatment Schedule – Stage A2 
The starting dose of M6620 will be 90mg/m2 IV once weekly (schedule 1). For all schedules, see Table 3. The 
treatment schedule of M6620 will be escalated or de-escalated using the TiTE-CRM model. 
Table 3: Stage A2 - Dose Escalation Schedule 
Dose Escalation schedule 
Treatment 
schedule
Dose of M6620 and days of the schedule it will be delivered
1 
90 mg/m2 once a week for 18 weeks (Tuesdays) 
2 
90 mg/m2 twice a week for 18 weeks (Tuesdays and Fridays) 
3 
140 mg/m2 once a week for 18 weeks (Tuesdays) 
4 
140 mg/m2 twice a week for 18 weeks (Tuesdays and Fridays) 
*Doses are stated as exact dose in units. No intermediate dose levels or further splitting of the dose allowed 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
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EudraCT Number: 2015-003965-27 
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4.3
Stage B Treatment 
The dose administered in stage B will be 140mg/m2 and will remain constant whilst three dosing schedules 
are explored. The chemotherapy and radiation doses and fractionation schedules will remain unchanged 
across dosing schedules. 
The 11 weeks of treatment consists of 6 weeks of induction chemotherapy (Capecitabine and Cisplatin) with 
M6620 (Berzosertib) followed by 5 weeks of concomitant chemoradiotherapy (Capecitabine, Cisplatin and 
radiotherapy) with M6620 (Berzosertib). All patients will receive M6620 (Berzosertib) with induction 
chemotherapy on Cycle 1 Day 2 and Cycle 2 Day 2. In the last week of chemotherapy patients will be assigned 
to a M6620 (Berzosertib) treatment schedule to be administered during chemoradiotherapy. Radiotherapy 
must start on a Monday.  
4.3.1 M6620 Treatment Dose and Schedule – Stage B 
The dose of M6620 in Stage B will be confirmed prior to recruitment to stage B and the starting schedule will 
be treatment schedule 1. 
Table 4: Stage B - Dose Escalation Schedule 
Dose Escalation Schedule  
Treatment 
Schedule 
M6620 administration during  induction 
chemotherapy 
M6620 administration during  
Chemoradiotherapy 
-1 
Cycle 1 day 2, 
Cycle 2 day 2 
Days  9, 16, 23, 30 
1 
As above 
Days 2, 5, 9, 16, 23, 26, 30 
2 
As above 
Days 2, 5, 9, 12, 16, 19, 23, 26, 30, 33 
STATISTICAL PRINCIPLES 
5.1
Statistical Significance and Multiple Testing 
There will be no statistical significance level defined for CHARIOT as it is a dose-finding trial and schedule 
recommendations will be based on the posterior probabilities calculated by the dose-toxicity model using all 
available data at each time.
5.2
Definition of Analysis Populations  
Patients will not be replaced since TiTE-CRM uses all accumulated data and all patients will be evaluable for 
dose escalation decisions. However, the TMG may decide to replace patients if drop-out occurs early in the 
treatment schedule for reasons other than a DLT.  
All patients who receive treatment within the study will be evaluable for response. All participants who receive 
at least one dose of M6620 will be evaluable for the safety analysis and included in the TiTE-CRM.   
Evaluable for Objective Response:  Only those patients who have measurable disease present at baseline, 
have received at least one cycle of therapy, and have had their disease re-evaluated will be considered 
evaluable for response.  These patients will have their response classified according to the definitions stated 


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in Protocol Appendix B (RECIST criteria).  (Patients who exhibit objective disease progression prior to the end 
of cycle 1 will be considered evaluable.) 
Evaluable Non-Target Disease Response: Patients who have lesions present at baseline that are evaluable 
but do not meet the definitions of measurable disease, have received at least one cycle of therapy, and have 
had their disease re-evaluated will be considered evaluable for non-target disease.  The response assessment 
is based on the presence, absence, or unequivocal progression of the lesions. 
TRIAL POPULATION AND DESCRIPTIVE ANALYSES 
6.1
Representativeness of Study Sample and Patient Throughput 
The flow of participants through each stage of the trial, including numbers of participants assigned to a 
schedule, receiving intended treatment, completing the study protocol, and analysed for the primary outcome 
is provided following CONSORT.  Protocol violations/deviations and information relating to the screening data 
including the number of ineligible patients entering the study, together with reasons will be reported. 
Information on number of participants screened, found to be ineligible (with reasons where available), refused 
to participate (with reasons where available) will also be included. 
A CONSORT diagram will be prepared for each stage. Figure 3 represents an example CONSORT diagram. 


A phase I dose escalation safety study combining the ATR inhibitor VX-970 with chemoradiotherapy in oesophageal cancer using time 
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Figure 3: Example CONSORT Diagram 
Enrolment
Assessed for eligibility (n= ) 
Excluded (n= ) 

Not meeting inclusion criteria 
(n= ) 

Declined to participate (n= ) 

Other reasons (n= ) 
Allocation 
Allocated to treatment schedule 1 (n=  
) 
   Received allocated schedule (n=  ) 
Did not receive allocated schedule
Allocated to treatment schedule 3 (n=  
) 
   Received allocated schedule (n=  ) 
Did not receive allocated schedule  
Allocated to treatment schedule 5 (n=  
) 
   Received allocated schedule (n=  ) 
Did not receive allocated schedule 
Allocated to treatment schedule 4 (n=  
) 
   Received allocated schedule (n=  ) 
Did not receive allocated schedule   
Allocated to treatment schedule 2 (n=  
) 
   Received allocated schedule (n=  ) 
Did not receive allocated schedule
Allocated to treatment schedule 6 (n=  
) 
   Received allocated schedule (n=  ) 
Did not receive allocated schedule  
Analysis
Analysed  (n=  ) 
   Excluded from analysis (n= 
)
Analysed  (n=  )
   Excluded from analysis (n= 
)
Analysed  (n=  ) 
   Excluded from analysis (n= 
Analysed  (n=  )
   Excluded from analysis (n= 
)
Analysed  (n=  ) 
   Excluded from analysis (n= 
)
Analysed  (n=  ) 
   Excluded from analysis (n= 


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6.2
Withdrawal from treatment and/or follow-up 
The Trial Office should be informed of any early patient withdrawal within 24 hours of the site becoming aware 
as described in the Protocol, Section 6. Withdrawals will be summarised, at each stage, but no formal 
assessments will be performed. 
6.2.1 Treatment Withdrawal  
During the course of the trial, a patient may withdraw early from treatment.  This may happen for a number 
of reasons, including: 

Unacceptable toxicity 

AE/SAEs requiring discontinuation 

Loss to follow-up 

Significant protocol deviation or inability to comply with trial procedures 

Clinical decision 

Patient decision 
The end of treatment means the patient will then enter the routine follow up stage of the trial. If M6620 
treatment is stopped, the patient will continue with standard treatment and will be followed up as part of the 
trial. 
6.2.2 Consent Withdrawal 
Consent withdrawal means that a patient has expressed a wish to withdraw from the study altogether.  Under 
these circumstances, the site needs to document all relevant discussions in the patient notes and notify the 
Trial Office, which will allow the office to mark all future CRFs as not applicable. The site should inform the 
Trial Office whether any samples already collected for the study should be destroyed. 
Under these conditions, investigators are still responsible to follow up any SAEs until resolution. 
6.3
Baseline Comparability of Randomised Groups 
Baseline characteristics will be reported for each stage, including important prognostic, demographic and 
clinical variables.   
Numbers (with percentages) for binary and categorical variables and means (and standard deviations), or 
medians (with lower and upper quartiles) for continuous variables will be presented. 
6.4
Unblinding 
The trial is not blinded. 
6.5
Description of Compliance with Intervention 
Patients will be instructed to keep a record of compliance in terms of their capecitabine treatment, by means 
of using a study patient diary card provided to the patient by the site. Patients should be asked to bring 
completed diary cards or other records and all their unused / remaining capecitabine tablets (empty, open or 
unopened) with them to each clinic visit. The patient diary cards should not be sent to the Trial Office but kept 
by the centre to monitor patient drug compliance. Compliance of M6620 and Cisplatin will be monitored by 
the patient record. 
Accountability logs are required for capecitabine to determine that patients have received at least 80% of the 
prescribed treatment dose. Returns should be reconciled against the patient diary and the reason for any 


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discrepancy documented. Site staff will collect and count patient returns, which must be recorded on the drug 
accountability log. 
Compliance with all study treatments will be summarised for each stage using proportions calculated with 
respect to the total dose prescribed. 
6.6
Reliability 
Data derivation/manipulation will be checked to ensure validity of the derived data, where appropriate. 
Calculations performed using the computer can be checked by hand for the smallest of 5% or 20 observations 
within the dataset, where appropriate. 
ANALYSIS 
7.1
Outcome Definitions 
A table presenting the objectives, outcome measures and evaluation time points for each stage can be found 
in Section 2.2 of this document. 
7.2
Analysis Methods 
7.2.1 Primary Outcome (All Stages) 
The primary outcome at each stage is to determine the best tolerated treatment schedule of M6620 
administered concomitantly with radiotherapy and/or chemotherapy (depending on the stage). The TiTE-CRM 
model will be used to achieve this as described in Section 1.13. Results will be presented as posterior 
probabilities and 95% credible intervals of the schedule-toxicity curve, both in tabular form and graphically. 
7.2.2 Secondary Outcomes 
Safety and Toxicity Profile of the M6620 (All Stages) 
The number (proportion) of patients who have had an AE recorded should be reported by schedule group. The 
number (proportion) of patients who have experienced one, two, three or more AEs will also be provided by 
schedule group. It is intended that the number of AEs recorded, the number of AEs per grade and the outcome 
will be reported. 
This analysis will be repeated twice: once using serious adverse events (SAEs) and once using serious adverse 
reactions (SARs). Note: SARs are SAEs that are recorded as being possibly, probably or definitely related to a 
component of treatment. For SARs, the treatment component the event was related to may also be described. 
Details of any SUSARs will be reported in the statistical report; the schedule group for the affected patient will 
be indicated. 
Dose limiting toxicities are classed as SAEs in CHARIOT and will be analysed as described above. Length of time 
for toxicities to resolve will also be summarised and presented as mean (SD) or median (IQR). 
Proportion of patients completing planned dose (All Stages) 
To determine the ability to deliver the M6620 with palliative radiotherapy (Stage A1) and palliative 
chemotherapy (Stage A2), the proportion of patients completing at least 75%, 90% and 100% of the planned 
dose will be tabulated by schedule group. 


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To determine tolerance and ability to deliver M6620 in combination with standard definitive 
chemoradiotherapy in Stage B, the proportion of patients completing at least 80% of the planned 
chemotherapy dose and at least 20 fractions of radiotherapy will be tabulated by schedule group. 
Efficacy of the combination (All Stages) 
Objective tumour response will be classified according to the RECIST v1.1 criteria. The number and proportion 
of patients who achieve Complete Response (CR), Partial Response (PR), (Stable Disease) SD and Progressive 
Disease (PD) will be reported overall and by treatment schedule. 
Overall survival (OS) will be presented by stage using Kaplan Meier graphs along with two-sided 95% 
confidence intervals. Median and quartile OS will also be presented together with their 2-sided 95% 
confidence intervals if applicable. 
Progression free survival (PFS) will be presented overall by stage using Kaplan Meier graphs along with two-
sided 95% confidence intervals. Median and quartile PFS will also be presented together with their 2-sided 
95% confidence intervals if applicable. 
In field radiotherapy control (Stage A1) 
This will be assessed and measured via CT scan response and/or clinical assessment. 
Note: The final statistical report should also include information on the number of participants used in each 
analysis model, and for the analysis of longitudinal follow-up data, the number of observations used. 
7.2.3 Tertiary Outcomes (Stage A2 and B) 
These outcomes will not be analysed as part of this SAP. 
7.3
Missing Data  
Every effort will be made for complete collection and recording of data. Dose allocation and primary outcome 
evaluation using the TiTE-CRM model requires complete data; for this reason, a dedicated CRF has been 
designed, which captures only that data required to run the model. 
No data imputation is planned. 
7.4
Sensitivity Analysis 
There will be four sensitivity analyses presented for each dose decision meeting. They will be analysed using 
the TiTE-CRM as in the primary analysis. These are:  
1.
Only using those patients who not missed any of their dose prescribed on their dose schedule, and 
weighted using the original TiTE-CRM weights, i.e. weighting only according to length of follow-up 
and not taking account of how much dose has been received 
2.
Only using those patients who have received at least 75% of the prescribed dose, using the same 
weight function as in the main analysis 
3.
Only using those patients who have received at least 75% of the prescribed dose, but using the 
original TiTE-CRM weights 


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4.
Using the same population and weighting as the primary population but assuming the “Most Toxic” 
Scenario. All patients currently on treatment within the DLT window have been assigned a DLT. 
For each of these analyses we will present the posterior probabilities of toxicity at each dose level and their 
associated 95% credible interval.  
7.5
Pre-specified Subgroup Analysis 
No formal subgroup analysis is planned.
7.6
Supplementary/ Additional Analyses and Outcomes 
No formal supplementary/additional analyses are planned. 
7.7
Health Economics and Cost Effectiveness (where applicable) 
No health economics and cost effectiveness analysis is planned. 
7.8
Meta-analyses (if applicable) 
No meta-analyses are planned. 
VALIDATION OF THE PRIMARY ANALYSIS 
The schedule recommendation for each recruited patient will be calculated using a bespoke, validated 
program developed in R and OpenBUGS by Jane Holmes. The program has been validated using another R
program developed independently by Eleni Frangou. Further, the output from these two programs has been 
validated using the titecrm function in the R package dfcrm. Details on this package are available here: 
https://cran.r-project.org/web/packages/dfcrm/. 
To validate the primary outcome and key secondary outcomes a statistician not involved in the trial will 
independently repeat the analyses detailed in this SAP. The results will be compared and any discrepancies 
will be reported in the Statistical report (See OCTRU SOP STATS-005 Statistical Report).
SPECIFICATION OF STATISTICAL PACKAGES 
All analysis will be carried out using R. The relevant package and version number will be recorded in the 
Statistical report. 
REFERENCES 
Cheung YK, Chappell R. Sequential designs for phase I clinical trials with late-onset toxicities. Biometrics. 
2000;56:1177–82. 
Gamble C, Krishan A, Stocken D, Lewis S, Juszczak E, Dore C, Williamson PR, Altman DG, Montgomery A, Lim 
P. Berlin K, Senn S, Day S, Barbachano Y, Loder E. Guidelines for the Content of Statistical Analysis Plans in 
Clinical Trials. JAMA. 2017 Dec 19;318(23):2337-2343. doi: 10.1001/jama.2017.18556.
APPENDIX: GLOSSARY OF ABBREVIATIONS  
SAP 
 
Statistical Analysis Plan 
DSMC  
Data and Safety Monitoring Committee  
TSC 
 
Trial Steering Committee 
CI 
 
Chief Investigator