Cervical Cancer Clinical Trial
Official title:
MR-Only Based Adaptive External Beam Radiation Therapy of Cervical Cancer on Ethos
Current management of patients treated with External Beam Radiation Therapy (EBRT) for cervical cancer with a classical Image-guided Radiation Therapy (IGRT) strategy involves a complex, not entirely satisfactory, treatment workflow. Indeed, in our institution, two workflows have been designed to take into account the inter-fraction motion of cervix and uterus : an Internal Target Volume (ITV)-based approach and a plan of the day strategy requiring both several planning-CT (Computed Tomography) acquisitions with variable bladder filling.The upcoming installation of a Varian Ethos therapy system in our institution will allow us to implement a less cumbersome online adaptive radiotherapy strategy (oART), which, by conforming to the daily anatomy, will enable a reduction in the Clinical Target Volume (CTV) to Planning Target Volume (PTV) margins leading to an expected reduction in dose delivered to organs at risk (OAR) .On the other hand, MR (Magnetic Resonance)-only treatment planning is playing an increasing role in radiotherapy, notably in the treatment of prostate cancer. MR-only workflows are known (a) to provide the most reliable delineation in soft tissues and (b) to decrease spatial uncertainties by suppressing the Magnetic Resonance Imaging (MRI)-CT co-registration. Regarding the management of cervical cancer, the importance of MRI is well established and its use becomes essential. Combining a MR-only workflow with an adaptative one on the Varian Ethos system, could lead to an improved management of patients treated for cervical cancer with an expected reduction in margins and volumes treated (thanks to MRI delineation and online adaptation) and therefore a reduction of OAR toxicity. Including regular multi-parametric MR imaging during and after the course of the treatment could also provide in the future an assessment of the treatment response. One of the important challenges in developing this specific workflow is to have a reliable synthetic CT (derived from MRI) to (a) provide electron or mass density for treatment planning calculations and (b) allow accurate online repositioning/deformation with Ethos Cone Beam Computed Tomography (CBCT). The other fundamental challenge is to provide a formal assessment of the clinical benefit of introducing MR-only simulation and planning in an oART workflow. This project aims to demonstrate the feasibility of setting up an adaptive workflow on the ETHOS platform with the sole use of MR patient image.The project is divided into two parts. The first part consists in demonstrate the feasibility of the workflow on 15 patients with cervix cancer.
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