Integration of non-invasive deep tissue microwave thermometry in the VectRx hyperthermia device in a transgenic liver tumor pig model

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Project Summary/Abstract NeoTherma Oncology (NTO/www.neothermaoncology.com) has developed a novel non-invasive medical device that delivers mild hyperthermia (HT) loco-regionally as adjuvant therapy to standard of care treatment of abdominal deep-seated tumors. The VectRx™ device, designated “Breakthrough” by the FDA, has demonstrated its ability to safely heat abdominal organs (pancreas, liver, kidney, spleen) in pre-clinical studies in healthy swine. FDA approved an investigational device exemption for VectRx on the basis of these data and the lack of a validated large animal tumor model for pancreatic cancer. NTO has initiated a First in Human early feasibility study (EFS) study at the University of Maryland Medical Center to collect initial safety and performance data in pancreatic cancer patients. In parallel to the EFS, NTO will collaborate with University of Colorado-Boulder researchers who have developed a microwave thermometer (MT) that could be utilized to non-invasively measure temperatures in deep tissue. This development is based on the ability to detect the black body radiation proportional to temperature that is emitted at different tissue depths from skin to deep organ. Successful integration of the MTs will effectively improve the clinical utility of VectRx. This will address challenges posed by the limited availability, access, high cost, logistical concerns and reliance on specialized personnel, as is the case with magnetic resonance thermometry. A series of MTs and a radiometer will be designed, fabricated, and integrated into VectRx with potential VectRx coil adjustments to 1) achieve compatible designs of active and passive MTs with operation within VectRx (on and off); 2) manage any potential heating of the MTs, coil detuning, E-field and H-field pattern integrity during VectRx operation. Following co-development and optimization, the MTs’s performance will be established in a hepatocellular carcinoma (HCC) Oncopig model with an accuracy goal of 1.5°C. HCC is a disease with low survival rates and only a small fraction (15%) of newly diagnosed patients are eligible for curative treatments due to late diagnosis. The model is relevant to NTO’s indication pipeline of deep-seated abdominal tumors, and NTO has previously completed installation of the VectRx device and performed preliminary work in 3 HCC Oncopigs with the veterinary team at the University of Illinois to optimize ultrasound- guided surgical placement of fiberoptic probes that will be used to correlate temperatures measured by the MTs. Despite the known benefits of mild HT, it has not been widely adopted in the US because of the technical limitations of current technologies to address deep, hard to heat tumors and the lack of thermometry. In this Phase I project, we will demonstrate that these critical deficiencies can be overcome through integration of novel microwave-based temperature techniques with VectRx, providing an innovative demonstration of advanced temperature monitoring of HT in deep tissue in a large animal tumor model.