NCT04530019

Brachytherapy Innovations in Gynecologic Cancer

Magnetic Resonance-Guided Brachytherapy Innovations in Gynecologic Cancer-Methods to Identify Remnant Tumor Versus Scar Tissue in Relation to Radiation Therapy

• Status: Withdrawn
• Phase: —
• Study type: Observational
• Enrollment: 0 (actual)
• Sponsor: Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins · Academic / Other
• Sex: Female
• Age: 18 Years – 80 Years
• Healthy volunteers: Not accepted

Summary

In this pilot study, the investigators will test tools designed to more precisely identify, define and create a radiation treatment plan to tumor remnants as separate from fibrotic or normal tissue in a Magnetic Resonance (MR) simulator in the department of radiation oncology. The investigators will examine if this beneficial for tumor versus normal tissue delineation, will result in more precise tumor targeting with radiation in an efficient manner and whether there would be fewer toxicities.

Detailed description

This study is a clinical research study following patients for toxicity after brachytherapy, and the investigators will be using the D2cc as a surrogate biomarker for determining risk for toxicity in addition to utilizing toxicity measured from physician-queries using the Common Toxicity Criteria for Adverse Events (CTCAE v. 4.0). Patients will have images analyzed for quantification of residual tumor versus fibrosis. The investigators will utilize Magnetic Resonance (MR) tracking, and pilot test: an endovaginal coil, a deflectable Magnetic Resonance stylet, real-time planning software, and auto-segmentation of normal tissues and tumor. Standard T2-weighted MR images are generally recommended given the soft-tissue visualization without the need for contrast media injection. At the time of brachytherapy, acquisition of para-axial, para-sagittal and para-coronal images should be performed with the orientations being orthogonal (para-axial) and parallel (para-sagittal/para-coronal) to the intrauterine tandem. Slice thickness has a direct impact on applicator reconstruction accuracy, and a slice thickness of ≤3mm is required on the NRG Oncology study (NRG-GY006). More advanced multi-parametric magnetic resonance imaging (mmpMRI) series show significant promise. A Dynamic Contrast Enhanced (DCE) study identified one voxel cluster consisting of low-enhancing voxels based on the relative signal increase (RSI) time series that was related to locoregional control (adjusted p-value 0.048). Diffusion-weighted (DW)-MRI is used to identify areas of dense residual tumor.31 In one analysis, the mean apparent diffusion coefficient (ADC) value of the primary tumor on pretreatment MRI was an independent predictor of disease-free survival in cervical cancer patients treated with chemoradiation. However, artifacts result in inconsistent contouring at the time of brachytherapy. 3D Slicer is a free open source software application for medical image computing, and will be utilized for some aspects of research in MR Simulator Suite.

Conditions

• Gynecologic Cancer

Timeline

• Start date: 2024-10-01
• Primary completion: 2030-12-01
• Completion: 2032-12-01
• First posted: 2020-08-28
• Last updated: 2024-11-29