GRASP: GRAph-Structured Pyramidal Whole Slide Image Representation
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Abstract (arXiv)
Cancer subtyping is one of the most challenging tasks in digital pathology, where Multiple Instance Learning (MIL) by processing gigapixel whole slide images (WSIs) has been in the spotlight of recent research. However, MIL approaches do not take advantage of inter- and intra-magnification information contained in WSIs. In this work, we present GRASP, a novel lightweight graph-structured multi-magnification framework for processing WSIs in digital pathology. Our approach is designed to dynamically emulate the pathologist's behavior in handling WSIs and benefits from the hierarchical structure of WSIs. GRASP, which introduces a convergence-based node aggregation mechanism replacing traditional pooling mechanisms, outperforms state-of-the-art methods by a high margin in terms of balanced accuracy, while being significantly smaller than the closest-performing state-of-the-art models in terms of the number of parameters. Our results show that GRASP is dynamic in finding and consulting with different magnifications for subtyping cancers, is reliable and stable across different hyperparameters, and can generalize when using features from different backbones. The model's behavior has been evaluated by two expert pathologists confirming the interpretability of the model's dynamic. We also provide a theoretical foundation, along with empirical evidence, for our work, explaining how GRASP interacts with different magnifications and nodes in the graph to make predictions. We believe that the strong characteristics yet simple structure of GRASP will encourage the development of interpretable, structure-based designs for WSI representation in digital pathology. Data and code can be found in https://github.com/AIMLab-UBC/GRASP
Key facts. Cited by 5 papers in the map (data through 7 Oct 2026). Builds on 25 of its 40 references that are in the map. First posted on arXiv 6 Feb 2024.
Builds on
25 of 40 references.
References · 25
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13 more
- 2021Whole Slide Images are 2D Point Clouds: Context-Aware Survival Prediction using Patch-based Graph Convolutional Networkscited by 124
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Citing papers per year: 2024: 3; 2025: 1; 2026: 1.
5 papers.
- 2024Graph Neural Networks in Histopathology: Emerging Trends and Future Directionscited by 13
- 2024A Comprehensive Evaluation of Histopathology Foundation Models for Ovarian Cancer Subtype Classificationcited by 12
- 2024Multi-Resolution Histopathology Patch Graphs for Ovarian Cancer Subtypingcited by 1
- 2025IPGPhormer: Interpretable Pathology Graph-Transformer for Survival Analysiscited by 1
- 2026Domain Adaptation Without the Compute Burden for Efficient Whole Slide Image Analysiscited by 0
- 2026Domain Adaptation Without the Compute Burden for Efficient Whole Slide Image Analysis16 Mar 2026
- 2025IPGPhormer: Interpretable Pathology Graph-Transformer for Survival Analysis17 Aug 2025
- 2024Multi-Resolution Histopathology Patch Graphs for Ovarian Cancer Subtyping25 Jul 2024
- 2024Graph Neural Networks in Histopathology: Emerging Trends and Future Directions18 Jun 2024
- 2024A Comprehensive Evaluation of Histopathology Foundation Models for Ovarian Cancer Subtype Classification16 May 2024