Multimodal electronic health record (EHR) data are widely used in clinical applications. Conventional methods usually assume that each sample (patient) is associated with the unified observed modalities, and all modalities are available for each sample. However, missing modality caused by various clinical and social reasons is a common issue in real-world clinical scenarios. Existing methods mostly rely on solving a generative model that learns a mapping from the latent space to the original input space, which is an unstable ill-posed inverse problem. To relieve the underdetermined system, we propose a model solving a direct problem, dubbed learning with Missing Modalities in Multimodal healthcare data (M3Care). M3Care is an end-to-end model compensating the missing information of the patients with missing modalities to perform clinical analysis. Instead of generating raw missing data, M3Care imputes the task-related information of the missing modalities in the latent space by the auxiliary information from each patient's similar neighbors, measured by a task-guided modality-adaptive similarity metric, and thence conducts the clinical tasks. The task-guided modality-adaptive similarity metric utilizes the uncensored modalities of the patient and the other patients who also have the same uncensored modalities to find similar patients. Experiments on real-world datasets show that M3Care outperforms the state-of-the-art baselines. Moreover, the findings discovered by M3Care are consistent with experts and medical knowledge, demonstrating the capability and the potential of providing useful insights and explanations.
|Title of host publication||KDD '22: Proceedings of the 28th ACM SIGKDD Conference on Knowledge Discovery and Data Mining|
|Publisher||Association for Computing Machinery|
|Number of pages||11|
|Publication status||Published - 14 Aug 2022|
|Event||28th ACM SIGKDD Conference on Knowledge Discovery and Data Mining - Washington, United States|
Duration: 14 Aug 2022 → 18 Aug 2022
Conference number: 28
|Name||Proceedings of the 28th ACM SIGKDD Conference on Knowledge Discovery and Data Mining|
|Conference||28th ACM SIGKDD Conference on Knowledge Discovery and Data Mining|
|Abbreviated title||KDD '22|
|Period||14/08/22 → 18/08/22|
Bibliographical noteFree access via publisher's website
This work is supported by the National Natural Science Foundation of China (No.62172011). L. Ma is supported by the China Postdoctoral Science Foundation (2021TQ0011). J. Wang is supported by EPSRC New Investigator Award under Grant No.EP/V043544/1.
© 2022 ACM.
- electronic health record
- healthcare informatics
- multimodal data
ASJC Scopus subject areas
- Information Systems