Square de Meeûs 18, 1000 Brussels, Belgium
www.esp-pathology.org
Summary page of the EQA programme
This page provides the information about the programme in a nutshell. It is as concise as it can be.
The programme is focused on external quality assessment of the PD-L1 staining of 4 carcinoma types (subschemes TNBC, NSCLC, UC and HNSCC).
Complete description you can find in the EQA Plan 2026 (namely page 31).
Short description is available in the PDL1 2026 flyer.
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| European Society of Pathology Quality Assurance Foundation Square de Meeûs 18, 1000 Brussels, Belgium www.esp-pathology.org |
| SEKK s.r.o., EHK Division Arnošta z Pardubic 2605, 530 02 Pardubice, Czech Republic www.sekk.cz |
The laboratories from all countries are welcome to participate in PDL1 programme.
Very simple guide on how to order the Programmed Death Ligand 1 (PDL1) and Programmed Death Ligand 1 (PDL1) programmes is available here.
The participants are free to order aby combination of the carcinoma types (sets of the samples).
Each participant examines 1 physical slide and 1 virtual slide for each carcinoma type they ordered.
The table shows complete collection of the sample sets:
| Set of the samples | Samples in the set | |
|---|---|---|
| Physical slide unstained | Virtual slide stained | |
| 1: TNBC | 
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| 2: NSCLC | 
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| 3: UC | 
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| 4: HNSCC | 
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Each slide bears one TMA section.
The columns (A to H) represent individual primary samples (carcinomas) different for each set (thus column A in TNBC slide is a tissue different from the column A in other slides).
There are 3 cores of each primary sample in the physical slide TMA (rows 1 to 3).
Blackened cores (● ●) represent tonsillar tissue (serve as block orientation element and staining quality indicator).
We believe that these examples will give you a good insight.
| Public part of the evaluation (EQA round PDL11/25) | Private part of the evaluation (anonymised and shortened examples from the EQA round PDL12/24) | ||||
 Final report |  Summary statistics |  Confirmation of attendance |  Certificate of approval
|  Result sheet
|  Histograms
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Last update: 9.1.2026