# Federated radiomics analysis of preoperative MRI across institutions: toward integrated glioma segmentation and molecular subtyping

## TL;DR

A new federated learning model uses MRI scans to predict glioma molecular features and grade without sharing patient data, offering a privacy-preserving alternative to invasive biopsies.

## Contribution

A novel federated multi-task deep learning framework for glioma segmentation and molecular subtyping using non-invasive MRI data.

## Key findings

- The model achieved high AUC scores for predicting IDH mutation, 1p/19q co-deletion, MGMT methylation, and WHO grade.
- Segmentation of T2w high signal regions reached a median Dice score of 0.85.
- The model was trained across five datasets and validated on an external test set without sharing raw patient data.

## Abstract

Non-invasive and comprehensive molecular characterization of glioma is crucial for personalized treatment but remains limited by invasive biopsy procedures and stringent privacy restrictions on clinical data sharing. Federated learning (FL) provides a promising solution by enabling multi-institutional collaboration without compromising patient confidentiality.

We propose a multi-task 3D deep neural network framework based on federated learning. Using multi-modal MRI images, without sharing the original data, the automatic segmentation of T2w high signal region and the prediction of four molecular markers (IDH mutation, 1p/19q co-deletion, MGMT promoter methylation, WHO grade) were completed in collaboration with multiple medical institutions. We trained the model on local patient data at independent clients and aggregated the model parameters on a central server to achieve distributed collaborative learning. The model was trained on five public datasets (n = 1,552) and evaluated on an external validation dataset (n = 466).

The model showed good performance in the external test set (IDH AUC = 0.88, 1p/19q AUC = 0.84, MGMT AUC = 0.85, grading AUC = 0.94), and the median Dice of the segmentation task was 0.85.

Our federated multi-task deep learning model demonstrates the feasibility and effectiveness of predicting glioma molecular characteristics and grade from multi-parametric MRI, without compromising patient privacy. These findings suggest significant potential for clinical deployment, especially in scenarios where invasive tissue sampling is impractical or risky.