Plain English Summary
Background and study aims
Pathologists (doctors who diagnose disease by studying tissue samples) use a microscope to examine tissue samples collected from patients. This is called light microscopy. It enables them to make a diagnosis and to give information on treatment and prognosis to clinicians (doctors). Digital pathology is a process to scan microscope slides into computer image files (digitised slides) which the pathologist can then examine on a computer screen. Digitised slides can be transferred electronically to allow pathologists to view cases at any location. This makes cases easy to share with colleagues, confirm diagnoses for patients, reduce errors and create better practices for sharing workload between departments. This will save time and resources for the NHS. Computer assisted tools can also be used to help make the diagnosis. None of these benefits can be realised until it is known how pathologists can use digital pathology safely and accurately for routine reporting.
Who can participate?
This study will not directly involve patients; instead, it will use samples from the breast, gastrointestinal tract, skin and kidney that have already been used in diagnosis
What does the study involve?
The present study attempts to explore if the use of whole slide imaging (Digital Pathology) is a safe, reliable and cost effective health technology for diagnosis, in routine clinical practice in comparison to standard microscopy.
What are the possible benefits and risks of participating?
There are no known benefits or risks.
Where is the study run from?
University Hospital Coventry and Warwickshire NHS Trust and 4 other hospitals in the UK
When is the study starting and how long is it expected to run for?
November 2018 to October 2021
Who is funding the study?
National Institute for Health Research (NIHR) Health Technology Assessment programme (HTA) (UK)
Who is the main contact?
Prof. D Snead
Consultant Pathologist
UHCW NHS Trust
Coventry CV2 2DX
02476965429
Trial website
Contact information
Type
Scientific
Primary contact
Prof David Snead
ORCID ID
http://orcid.org/0000-0002-0766-9650
Contact details
Cellular Pathology Department
4th Floor
West Wing
Clifford Bridge Road
Walsgrave
Coventry
CV22DX
United Kingdom
024 76 968320
david.snead@uhcw.nhs.uk
Additional identifiers
EudraCT number
ClinicalTrials.gov number
Protocol/serial number
DS411118
Study information
Scientific title
Multi-centred validation of digital whole slide imaging for routine diagnosis
Acronym
Study hypothesis
Light microscopy diagnosis is safe and reliable in comparison to the use of whole slide imaging (Digital Pathology) in routine practice
Ethics approval
We are at present confirming the requirement for an ethical review.
Study design
Multi-centre randomised comparison study
Primary study design
Other
Secondary study design
Trial setting
Hospitals
Trial type
Diagnostic
Patient information sheet
No participant information sheet available
Condition
Histopathological diagnosis
Intervention
The study involves exploring concordance between the results of histopathological sample analysis performed by pathologists examining the same series of samples using both light microscopy (LM) and digital microscopy (DP). The tissue samples selected for the study will have completed their appropriate clinical assessment at the respective site thus we do not plan any follow up or observation.
Each site will select appropriate samples and these link anonymised samples (glass slides) will be forwarded to University Hospital Coventry and Warwickshire (UHCW). Once received, the samples will be scanned at UHCW and digital slides of the samples will be created additionally, these slides, both glass and digital, will be given study numbers for anonymisation. These samples will then be randomised in batches, for viewing either LM first or DP. On completion of analysis of a particular sample, by all four pathologists, the samples will be returned to their original site.
Intervention type
Other
Phase
Drug names
Primary outcome measure
Intra-pathologist agreement between digital pathology and light microscopy diagnoses, measured by comparing the concordance between the results of pathologists’ diagnoses made by assessment of LM of breast, GI, skin and renal samples, with the same pathologists’ diagnoses of the same samples (intra-rater (pathologists) reliability) using DP.
There will be three categories for the level of agreement; complete agreement, clinically unimportant difference and clinically important difference. For each sample, three sets of agreements will be reported:
1. Whether for each pathologist’s DP and LM diagnoses agree
2. Whether each of the four DP diagnoses agree with the ground truth (GT)
3. Whether each of the four LM diagnoses agree with the GT.
This will be completed after all results have been completed and analysed (20-30 months)
Secondary outcome measures
1. Pathologist agreement to GT and LM vs GT and DP will be measured using using text reports.
1.1. For each pathologist it will be recorded if DP and LM have complete agreement, have clinically unimportant differences or clinically important differences.
1.2. Discordant samples will be circulated to each of the subspecialty pathologists, along with the reference diagnosis. Each subspecialty group will then meet and agree a consensus GT for each discrepant sample using multi-headed microscope discussion and majority view where necessary. The agreement between GT and LM vs GT and DP will then be determined.
2. Inter-pathologist agreement for LM and DP separately will be measured using text reports. Reports without any differences will be deemed concordant, with the concordant diagnosis being accepted as the GT.
3. Individual pathologist non-concordance rates will be measured throughout the study.
4. Costs and benefits associated with DP when compared with LM will be measured for all samples, if feasible, once all samples have been analysed. If not, analysis will be carried out for a purposive sample selected on the basis of clinical materiality and the availability of decision-analytic models in the literature to support cost-benefit calculations.
4.1. The throughput efficiencies of DP vs LM will be measured using simulation models of the pathway to diagnosis and establishment of a fully specified treatment plan.
4.1.1. Pathologists will be asked to provide time and motion data and anonymised summary data from the pathology service will be collected.
4.2. The effect of increased accuracy on choice of treatment will be made using estimates of the cost and health impact of the treatment strategies suggested as a result of DM or LM use.
5. Experiences of pathologists and laboratory staff
5.1. A web-based survey will be conducted along with the pilot study.
5.2. Semi-structured interviews at baseline will explore staff experiences and perspectives on DP.
5.3. Semi-structured interviews 18 months into the implementation of DP will explore staff experiences over time, training needs and the perceived impact on day-to-day working in multidisciplinary teams.
Overall trial start date
01/11/2018
Overall trial end date
31/10/2021
Reason abandoned (if study stopped)
Eligibility
Participant inclusion criteria
Histopathology samples:
Case identification and selection will take place between January 2019 – January 2022 at five participating NHS histopathology departments. All samples are collected for the purpose of routine histopathology reporting and only entered into the validation study on completion of their clinical review at the respective NHS participating site, with the following specification:
1. Breast (Belfast, Lincoln & Nottingham) – A total of 600 sequential samples including 200 cancer screening biopsies enriched with at least 10% resected tumours (moderately difficult) and 10% difficult cases: low grade ductal carcinoma in situ, atypical hyperplasia, screening category B3 and B4, lesions with calcium oxalate (Weddellite calcification), sclerosing and papillary lesions, and micrometastases.
2. GI (Coventry, Belfast & Nottingham): – A total of 600 sequential samples including 200 cancer screening biopsies enriched with at least 10% resected tumours (moderately difficult) and 10% difficult: oesophageal dysplasia, polyp cancers, inflammatory bowel disease, minimal change colitis, graft versus host disease, giardiasis, cytomegalovirus, H. pylori and herpes virus infection.
3. Skin (Coventry, Belfast & Lincoln) : A total of 600 sequential samples enriched with at least 10% non-basal cell carcinoma cancer resections (moderately difficult) and 10% difficult: sentinel nodes, dysplastic naevi, spitz naevi, lentigo maligna, early and desmoplastic melanoma, herpes virus infection, leischmaniasis, leprosy, amyloid, angioscaroma, and Kaposis sarcoma.
4. Renal (Coventry, Nottingham & Oxford): A total of 200 sequential native biopsies for glomerular, tubulointerstitial and vascular disease and transplant biopsies for graft rejection. No enrichment is planned in the renal biopsy group as all of these biopsies are difficult to report.
Staff (for the qualitative part of the study):
Staff employed at the participating sites, including any of the following:
1. Pathologists
2. Trainee doctors
3. Biomedical scientists
4. Biomedical assistants
5. Advanced practitioners
6. Medical laboratory assistants
Participant type
Other
Age group
Other
Gender
Both
Target number of participants
2000 samples
Participant exclusion criteria
Cases with either broken or missing slides
Recruitment start date
01/02/2019
Recruitment end date
30/06/2021
Locations
Countries of recruitment
United Kingdom
Trial participating centre
University Hospital Coventry and Warwickshire NHS trust
Clifford Bridge Road
Coventry
CV22DX
United Kingdom
Trial participating centre
Nottingham University Hospitals NHS Trust
Hucknall Road, Nottingham
Nottingham
NG5 1PB
United Kingdom
Trial participating centre
United Lincolnshire Hospitals NHS Trust
Greetwell Rd
Lincoln
LN2 5QY
United Kingdom
Trial participating centre
John Radcliffe Hospital Oxford NHS Trust
Headley Way, Headington,
Oxford
OX3 9DU
United Kingdom
Trial participating centre
Belfast Health and Social Care Trust
Faculty of Medicine, Health & Life Sciences, Elmwood Exchange, 90 Lisburn Road,
Belfast
BT9 6AG
United Kingdom
Sponsor information
Organisation
University Hospital Coventry and Warwickshire (UHCW) NHS Trust
Sponsor details
Clifford Bridge Road
Walsgrave
Coventry
CV22DX
United Kingdom
02476966197
R&DSponsorship@uhcw.nhs.uk
Sponsor type
Hospital/treatment centre
Website
Funders
Funder type
Not defined
Funder name
NIHR-HTA
Alternative name(s)
Funding Body Type
Funding Body Subtype
Location
Results and Publications
Publication and dissemination plan
We plan the following papers for peer review, open access publication, following presentation at national and international conferences:
1. Multi-centre study measuring the precision and accuracy of digital whole slide imaging in the reporting of histopathology samples
2. Is digital pathology an alternative to conventional light microscopy for reporting of renal biopsies? – Implications for the future of renal pathology in the NHS
3. Experiences of using digital whole slide imaging for routine histopathology reporting in the NHS – a multi-centre study
4. The cost of implementing digital pathology solutions in the NHS and the expected return on investment
5. The cost of diagnostic inaccuracies in histopathology and can these be mitigated by adopting digital pathology?
6. How pathologists examine digital whole slide images – can improved examination technique reduce error?
7. Reporting the findings of the eye tracking data from the DP arm in relation to diagnostic accuracy across the study
IPD sharing statement:
The data sharing plans for the current study are unknown and will be made available at a later date
Intention to publish date
01/10/2022
Participant level data
To be made available at a later date
Basic results (scientific)
Publication list