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Keywords Rectal cancer Organ preservation Watch-and-wait Local excision Total mesorectal excision Salvage surgery Neoadjuvant chemoradiotherapy Propensity score matching Get full text access Log in, subscribe or purchase for full access. Data availability statement the original dataset used in the study are available on reasonable request to the corresponding author References 1. National Comprehensive Cancer Network. NCCN Clinical Practice Guidelines in Oncology: Rectal Cancer. Version 4.2025.

Federated learning (FL) over mobile and edge devices increasingly involves multimodal models in which clients differ in both sensing capability and computational capacity. Existing update compression schemes typically apply uniform policies across layers and devices, without accounting for modality-specific differences in spectral structure and compressibility.