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HERMES is a hybrid ensemble algorithm designed for head-and-neck tumor segmentation, TN staging, and recurrence-free survival prediction using FDG-PET/CT scans and electronic health records. By employing a 10-fold ensemble of STU-Net Small networks for segmentation and deriving geometry features for staging, the model significantly improved N-stage balanced accuracy from 0.691 to 0.720 while maintaining lower feature dimensionality. On the HECKTOR 2026 validation leaderboard, HERMES achieved a weighted score of 0.6454, demonstrating its effectiveness across multiple clinical tasks without tuning on the public validation set.
Geometry-derived features in HERMES boost N-stage accuracy by 4.3% while simplifying the model's complexity.
We present HERMES (Hybrid Ensemble for Radiotherapy-target segmentation, Malignancy staging, and Event-free Survival), a single containerized algorithm for the three HECKTOR 2026 subtasks: segmentation of the primary tumor (GTVp) and pathological lymph nodes (GTVn), radiological T/N staging, and recurrence-free survival (RFS), computed from a paired FDG-PET/CT scan and an electronic health record. A 10-fold ensemble of STU-Net Small networks produces the segmentation; the predicted mask then drives two downstream tasks. Rather than pass a generic radiomics vector to the staging models, we derive from the predicted masks a compact set of geometry features aligned with the size and number axes of AJCC/UICC 7th-edition radiological N/T staging. On internal cross-validation these features raise N-stage balanced accuracy from 0.691 to 0.720 (+0.030), our largest single design gain, at lower feature dimensionality. For prognosis we combine complementary deep and clinical risk experts in an equal-weight ensemble, and train one deep expert with a concordance-tracking survival loss of our own, whose value approximates the concordance index during training. Every component was selected on honest out-of-fold predictions under a regularization-oriented protocol, with no tuning on the public validation set, and deployed as two decorrelated submissions. On the HECKTOR 2026 validation leaderboard, HERMES achieved a weighted score of 0.6454 (Mean Dice 0.641, T balanced accuracy 0.580, N balanced accuracy 0.642, RFS C-index 0.679) and qualified for the testing phase. Team: AMC_HNC.
