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Gigascience. 2018 Jun 1;7(6). doi: 10.1093/gigascience/giy065.

1399 H&E-stained sentinel lymph node sections of breast cancer patients: the CAMELYON dataset.

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Diagnostic Image Analysis Group, Department of Pathology, Radboud University Medical Center, Huispost 824, Geert Grootteplein-Zuid 10, 6525GA Nijmegen, The Netherlands.
Department of Pathology, University Medical Center Huispost H04.312, Heidelberglaan 100, 3584CX, Utrecht, The Netherlands.
Laboratory for Pathology East Netherlands (LabPON), Postbus 516, 7550AM Hengelo, The Netherlands.
Department of Pathology, Canisius-Wilhelmina Hospital, Postbus 9015, 6500GS Nijmegen, The Netherlands.
Department of Pathology, Rijnstate Hospital, Pathology-DNA, Postbus 9555, 6800TA Arnhem, The Netherlands.



The presence of lymph node metastases is one of the most important factors in breast cancer prognosis. The most common way to assess regional lymph node status is the sentinel lymph node procedure. The sentinel lymph node is the most likely lymph node to contain metastasized cancer cells and is excised, histopathologically processed, and examined by a pathologist. This tedious examination process is time-consuming and can lead to small metastases being missed. However, recent advances in whole-slide imaging and machine learning have opened an avenue for analysis of digitized lymph node sections with computer algorithms. For example, convolutional neural networks, a type of machine-learning algorithm, can be used to automatically detect cancer metastases in lymph nodes with high accuracy. To train machine-learning models, large, well-curated datasets are needed.


We released a dataset of 1,399 annotated whole-slide images (WSIs) of lymph nodes, both with and without metastases, in 3 terabytes of data in the context of the CAMELYON16 and CAMELYON17 Grand Challenges. Slides were collected from five medical centers to cover a broad range of image appearance and staining variations. Each WSI has a slide-level label indicating whether it contains no metastases, macro-metastases, micro-metastases, or isolated tumor cells. Furthermore, for 209 WSIs, detailed hand-drawn contours for all metastases are provided. Last, open-source software tools to visualize and interact with the data have been made available.


A unique dataset of annotated, whole-slide digital histopathology images has been provided with high potential for re-use.

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