Gustave Roussy, the leading cancer center in France and Europe, has deployed GrayOS in its radiation therapy department. This deployment makes the Institute the first European institution to adopt a care orchestration platform for radiation therapy.

A Context of Growing Pressure

More than 4,200 patients were treated by Gustave Roussy's radiation therapy department in 2025, accounting for over 50,000 sessions delivered by a team of 150 healthcare professionals. Like all French cancer centers, Gustave Roussy is facing constantly evolving demand: treatment protocols are growing more complex, patient pathways are becoming increasingly multimodal, and pressure on care timelines is intensifying. Reducing these timelines is a nationally recognized public health priority.

In this context, radiation therapy appointment coordination still relies heavily on manual processes. Planning teams manage numerous simultaneous constraints: machine availability, treatment protocols, clinical rules, and emergency scheduling. This coordination work, essential to the smooth functioning of the department, consumes a significant amount of administrative time.

What GrayOS Delivers

GrayOS is deployed on top of Gustave Roussy's existing systems (MOSAIQ and DxCare) without replacing them. The platform reads data from these systems, applies the department's operational rules, and continuously optimizes appointment scheduling. It reduces care delays, improves machine utilization, better coordinates patient pathways, and frees clinical teams from manual coordination work.

"Radiation therapy is becoming more precise, more individualized, and more integrated with other therapeutic modalities every year. This evolution, which directly benefits patients, also generates operational complexity that existing tools can no longer absorb adequately. By deploying GrayOS, we are choosing an infrastructure capable of evolving at the pace of our discipline and our volumes — one that allows our teams to focus on what matters most: the quality of care delivered to each patient."

— Professor Éric Deutsch, Head of the Radiation Therapy Department at Gustave Roussy.

A Deployment Aligned with the PSI 2030 Vision

This deployment is part of Gustave Roussy's 2030 Institutional Strategic Plan, which aims to make the institution a European reference "smart hospital" in oncology. The PSI 2030 identifies streamlining patient pathways, reducing care delays, and adopting technologies capable of handling growing volumes as priority areas. GrayOS directly addresses these objectives by providing an operational orchestration layer that adapts to the department's day-to-day reality.