Abstract
Tumor budding in colorectal cancer (CRC) is recognized as a valuable prognostic factor but its translation into daily histopathology practice has been delayed by lack of agreement on the optimal method of assessment. Within the context of the Swiss Association of Gastrointestinal Pathology (SAGIP), we performed a multicenter interobserver study on tumor budding, comparing hematoxylin and eosin (H&E) with pan-cytokeratin staining using a 10 high power field (10HPF) and hotspot (1HPF) method. Two serial sections of 50 TNM stage II-IV surgically treated CRC were stained for H&E and pan-cytokeratin. Tumor buds were scored by independent observers at six participating centers in Switzerland and Austria using the 10HPF and 1HPF method on a digital pathology platform. Pearson correlation (r) and intra-class correlation coefficients (ICC) comparing scores between centers were calculated. Three to four times more tumor buds were detected in pan-cytokeratin compared to H&E slides. Correlation coefficients for tumor budding counts between centers ranged from r = 0.46 to r = 0.91 for H&E and from r = 0.73 to r = 0.95 for pan-cytokeratin slides. Interobserver agreement across all centers was excellent for pan-cytokeratin [10HPF: ICC = 0.83 and 1HPF: ICC = 0.8]. In contrast, assessment of tumor budding on H&E slides reached only moderate agreement [10HPF: ICC = 0.58 and 1HPF: ICC = 0.49]. Based on previous literature and our findings, we recommend (1) pan-cytokeratin staining whenever possible, (2) 10HPF method for resection specimens, and (3) 1HPF method for limited material (preoperative biopsy or pT1). Since tumor budding counts can be used to determine probabilities of relevant outcomes and as such more optimally complement clinical decision making, we advocate the avoidance of cutoff scores.
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Abbreviations
- CRC:
-
Colorectal cancer
- H&E:
-
Hematoxylin and eosin
- HPF:
-
High power fields
- ICC:
-
Intra-class correlation coefficient
- ITB:
-
Intra-tumoral budding
- r :
-
Pearson correlation coefficient
- SAGIP:
-
Swiss Association of Gastrointestinal Pathology
- UICC:
-
Union for International Cancer Control
- TNM stage:
-
Tumor Node Metastasis stage
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Acknowledgments
The authors thank Mary Economou and Caroline Hammer from the Translational Research Unit, Institute of Pathology, University of Bern for excellent technical support.
Conflicts of interest
The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties.
Authors contributions
VHK obtained, reviewed, and categorized histopathological data, scored tumor budding, performed data interpretation, and together with IZ drafted the manuscript; IZ obtained and categorized clinicopathological data, performed data interpretation and statistical analysis. AL reviewed cases and together with VHK conceived the study and study design and performed manuscript editing; MDB, GC, KD, FO, GP, WS, and LT scored the cases, and reviewed and approved the final manuscript. HD obtained, reviewed, and categorized histopathological data, reviewed and approved the final manuscript. MDB, DI, MH, and BS obtained, reviewed, and categorized clinical data, and reviewed and approved the final manuscript. All authors have read and given approval of the final manuscript.
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The use of patient material has been approved by the local ethics committee of the Insel University Hospital (16-03-12).
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Viktor H. Koelzer and Inti Zlobec contributed equally to this work.
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Supplemental Fig. 1
Study design. 198 colorectal cancer patients treated at the Bern University hospital were initially entered into the study. Clinical data were retrieved from patient records and slides were re-reviewed by an expert gastrointestinal pathologist and two residents. 50 cases were randomly selected for further study, serial H&E and pan-cytokeratin stained sections were made and digitized using an Aperio Image Scope. Digital slides were distributed to six independent academic centers in Switzerland and Austria and evaluated separately for tumor budding using a virtual pathology platform. Tumor budding scores for H&E and pan-cytokeratin from each center were assessed for interobserver variability for a 10HPF and hotspot method. (GIF 156 kb)
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Koelzer, V.H., Zlobec, I., Berger, M.D. et al. Tumor budding in colorectal cancer revisited: results of a multicenter interobserver study. Virchows Arch 466, 485–493 (2015). https://doi.org/10.1007/s00428-015-1740-9
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DOI: https://doi.org/10.1007/s00428-015-1740-9