Publication Database

Deep learning algorithms out-perform veterinary pathologists in detecting the mitotically most active tumor region (2020)

Art

Zeitschriftenartikel / wissenschaftlicher Beitrag

Autoren

Aubreville, Marc

Bertram, Christof A. (WE 12)

Marzahl, Christian

Gurtner, Corinne

Dettwiler, Martina

Schmidt, Anja

Bartenschlager, Florian (WE 12)

Merz, Sophie (WE 12)

Fragoso, Marco (WE 12)

Kershaw, Olivia (WE 12)

Klopfleisch, Robert (WE 12)

Maier, Andreas

Quelle

Scientific reports

Bandzählung: 10

Heftzählung: 1

Seiten: Article number: 16447

ISSN: 2045-2322

Sprache

Englisch

Verweise

URL (Volltext): https://www.nature.com/articles/s41598-020-73246-2

DOI: 10.1038/s41598-020-73246-2

Pubmed: 33020510

Kontakt

Institut für Tierpathologie

Robert-von-Ostertag-Str. 15
14163 Berlin
+49 30 838 62450
pathologie@vetmed.fu-berlin.de

Abstract / Zusammenfassung

Manual count of mitotic figures, which is determined in the tumor region with the highest mitotic activity, is a key parameter of most tumor grading schemes. It can be, however, strongly dependent on the area selection due to uneven mitotic figure distribution in the tumor section. We aimed to assess the question, how significantly the area selection could impact the mitotic count, which has a known high inter-rater disagreement. On a data set of 32 whole slide images of H&E-stained canine cutaneous mast cell tumor, fully annotated for mitotic figures, we asked eight veterinary pathologists (five board-certified, three in training) to select a field of interest for the mitotic count. To assess the potential difference on the mitotic count, we compared the mitotic count of the selected regions to the overall distribution on the slide. Additionally, we evaluated three deep learning-based methods for the assessment of highest mitotic density: In one approach, the model would directly try to predict the mitotic count for the presented image patches as a regression task. The second method aims at deriving a segmentation mask for mitotic figures, which is then used to obtain a mitotic density. Finally, we evaluated a two-stage object-detection pipeline based on state-of-the-art architectures to identify individual mitotic figures. We found that the predictions by all models were, on average, better than those of the experts. The two-stage object detector performed best and outperformed most of the human pathologists on the majority of tumor cases. The correlation between the predicted and the ground truth mitotic count was also best for this approach (0.963-0.979). Further, we found considerable differences in position selection between pathologists, which could partially explain the high variance that has been reported for the manual mitotic count. To achieve better inter-rater agreement, we propose to use a computer-based area selection for support of the pathologist in the manual mitotic count.