Ranking XAI Methods for Head and Neck Cancer Outcome Prediction

arXiv cs.CV / 4/20/2026

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Key Points

  • The paper addresses the challenge of predicting outcomes for head and neck cancer patients using PET/CT AI while emphasizing that interpretability is a major barrier to clinical adoption.
  • It is the first study to comprehensively evaluate and rank 13 explainable AI (XAI) methods for head and neck cancer across 24 evaluation metrics.
  • The evaluation covers multiple quality dimensions including faithfulness, robustness, complexity, and plausibility rather than relying on ad-hoc or purely empirical selection.
  • Experiments on the multi-center HECKTOR challenge dataset show that XAI methods vary substantially, and Integrated Gradients (IG) and DeepLIFT (DL) achieve consistently high rankings across key criteria.
  • The authors argue that thorough XAI assessment is critical for medical imaging deployment and that the approach can be generalized to other medical imaging tasks.

Abstract

For head and neck cancer (HNC) patients, prognostic outcome prediction can support personalized treatment strategy selection. Improving prediction performance of HNC outcomes has been extensively explored by using advanced artificial intelligence (AI) techniques on PET/CT data. However, the interpretability of AI remains a critical obstacle for its clinical adoption. Unlike previous HNC studies that empirically selected explainable AI (XAI) techniques, we are the first to comprehensively evaluate and rank 13 XAI methods across 24 metrics, covering faithfulness, robustness, complexity and plausibility. Experimental results on the multi-center HECKTOR challenge dataset show large variations across evaluation aspects among different XAI methods, with Integrated Gradients (IG) and DeepLIFT (DL) consistently obtained high rankings for faithfulness, complexity and plausibility. This work highlights the importance of comprehensive XAI method evaluation and can be extended to other medical imaging tasks.