Quantitative surrogate MR biomarkers for neuroprotection
Proton MR spectroscopy surrogate biomarkers are making a step change in the way we do multi-centre early phase clinical trials in neonatal encephalopathy.
Dr Pete Lally
Senior MR Physicist, Centre for Perinatal Neuroscience
Clinical trials based on the neurodevelopmental outcome of babies is a highly infective way of developing new treatments, due to the long gap between an intervention and a meaningful outcome evaluation.
Our work suggests robust 3 Tesla magnetic resonance (MR) spectroscopy surrogate biomarkers will increase the power of clinical trials, whilst reducing their duration by several years.
Magnetic Resonance Biomarkers in Neonatal Encephalopathy (MARBLE) Study: (Funding: NIHR)
We recruited 223 babies with neonatal encephalopathy across eight neonatal intensive care units in the UK and USA and compared the accuracy of various MR biomarkers that predict neurodevelopmental outcomes at 2 years of age. This was the largest prospective multi-centre study of neonatal MR biomarkers in the world, and the data is currently being prepared for publication.
Funding: National Institute of Health Research (UK)
Sponsor: Imperial College London
|No||Hospital||Principal Investigator||MRI Scanner|
|1||University College Hospital, London, UK||Dr Angela Heurtas||3T Philips|
|2||Imperial Healthcare NHS Trust, UK||Dr Sudhin Thayyil||3T Philips|
|3||Medway NHS Hospital Foundation Trust, UK||Dr Aung Soe||3T GE|
|4||Coventry University Hospital, UK||Dr Prakash Satodia||3T GE|
|5||Norwich University Hospital, UK||Dr Paul Clarke||3T GE|
|6||Liverpool Women's Hospital, UK||Dr Kiran Yajamanyam||3T Philips|
|7||Royal Victoria Infirmary, Newcastle, UK||Dr Sundeep Harigopal||3T Siemens|
|8||Wayne State University, USA||Professor Seetha Shankaran||3T GE|
|Recruitment is now complete|
Cooling in Mild Neonatal Encephalopathy (COMET): (Funding NIHR)
Although cooling therapy is an established treatment for babies with moderate or severe neonatal encephalopathy, the risk benefits and optimal duration of this therapy for babies with encephalopathy is not known.
COMET trial uses a novel study design, with proton MR spectroscopy thalamic N-acetyl aspartate level, as the primary outcome measure. COMET is a sequential study that includes a feasibility phase, phase II randomised controlled trial to identify the ‘optimal cooling duration’, and then a final confirmatory phase III clinical trial to examine if cooling therapy at this optimal duration improves neurodevelopmental outcomes after mild encephalopathy.
Funding: National Institute of Health Research (UK), and Weston Garfield Foundation
Sponsor: Imperial College London
Cooling in Mild Encephalopathy (COMET) Trial: Protocol
Cooling in Mild Encephalopathy (COMET): Parent Information Sheet
Cooling in Mild Encephalopathy (COMET): REC Approval
Cooling in Mild Encephalopathy (COMET): HRA Approval
COMET Trial will be open to recruitment soon
Early Xenon plus cooling in neonatal encephalopathy (Cool Xenon) (Funding: Action Medical Research)
Although the results of the TOBY Xenon trial were dissappointing, Xenon was delivered late (after 6 hours of age) in this trial, and hence might have missed a treatment effect.
In pre-clinical models, early high dose xenon therapy augments the neuroprotection offered by cooling therapy. Babies with neonatal encephalopathy are being randomised to cooling alone or cooling with inhaled Xenon within 5 hours of birth, in this phase II trial led by Professor Thoresen and Ela Chakkarapani at Bristol University. This study will be completed by 2018.
Magnetic Resonance Imaging in Neonatal Encephalopathy and N-acetyl cysteine (MARINAC) Study (Funding: NIHR and BRC)
N-acetyl cysteine (NAC) therapy augments hypothermic neuroprotection in animal models. We are undertaking the early phase studies of this therapy in neonatal encephalopathy, in collaboration with Dr Doe Jenkins at the Medical University of South Carolina. In the first phase of MARINAC, we examined if cerebral glutathione (GSH) levels (via MR spectroscopy), and serum oxidative stress markers (via mass spectrometry), were altered by N-acetyl cysteine. A phase II randomised controlled trial will begin in 2019.
Magnetic Resonance Imaging in Infection Associated Neonatal Encephalopathy (MARINE) (Funding: NIHR)
In this study, we have developed a rapid acquisition method (reduced from 30min to 10min) which could be used across all clinical 3T MRI scanners in the NHS, without the need for specialist software or research agreements with the scanner vendor (this is usually a significant barrier to the widespread implementation of locally developed techniques). We have also developed automated analysis software for the accurate and rapid quantification of the MR spectroscopy data, which will enable all NHS hospitals to use MR spectroscopy in babies with neonatal encephalopathy without the need for a local MR spectroscopy expert.
MARINE study is now complete and the results will be published soon.