Self-supervised learning for analysis of temporal and morphological drug effects in cancer cell imaging dataDownload PDF

09 Dec 2021, 12:14 (edited 22 Jun 2022)MIDL 2022Readers: Everyone
  • Keywords: Self-supervised learning, regularized learning, time-series, distance-based analysis, classification, feature importance, explainability, interpretability, cancer research.
  • TL;DR: We propose two novel methodologies to study temporal and morphological phenotypic effects caused by different experimental conditions.
  • Abstract: In this work, we propose two novel methodologies to study temporal and morphological phenotypic effects caused by different experimental conditions using imaging data. As a proof of concept, we apply them to analyze drug effects in 2D cancer cell cultures. We train a convolutional autoencoder on 1M images dataset with random augmentations and multi-crops to use as feature extractor. We systematically compare it to the pretrained state-of-the-art models. We further use the feature extractor in two ways. First, we apply distance-based analysis and dynamic time warping to cluster temporal patterns of 31 drugs. We identify clusters allowing annotation of drugs as having cytotoxic, cytostatic, mixed or no effect. Second, we implement an adversarial/regularized learning setup to improve classification of 31 drugs and visualize image regions that contribute to the improvement. We increase top-3 classification accuracy by 8% on average and mine examples of morphological feature importance maps. We provide the feature extractor and the weights to foster transfer learning applications in biology. We also discuss utility of other pretrained models and applicability of our methods to other types of biomedical data.
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  • Paper Type: both
  • Primary Subject Area: Application: Other
  • Secondary Subject Area: Interpretability and Explainable AI
  • Confidentiality And Author Instructions: I read the call for papers and author instructions. I acknowledge that exceeding the page limit and/or altering the latex template can result in desk rejection.
  • Code And Data: The code is available at: https://github.com/dmitrav/pheno-ml The data is currently not available, because it is being prepared for another (biological) publication.
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