Focused Ultrasound Therapy
Focused ultrasound is an early-stage, non-invasive, therapeutic technology with the potential to improve the quality of life and decrease the cost of care for patients with neuroblastoma. This novel technology focuses beams of ultrasonic energy precisely and accurately on targets deep in the brain without damaging surrounding normal tissue. Where the beams converge, the ultrasound produces a variety of therapeutic effects that could potentially enable neuroblastoma to be treated without surgery.
The mainstay of treatment for neuroblastoma is surgical resection coupled with chemotherapy. However, many patients do not respond adequately to chemotherapy and commonly relapse. Furthermore, most long-term survivors suffer adverse effects from their treatment.
For certain patients, focused ultrasound ablation – to kill tumor cells – could provide a non-invasive alternative to surgery with less risk of complications and lower cost. Focused ultrasound-induced hyperthermia – moderate heating of tissue that is below the threshold for cell death – has the potential to increase blood flow to the tumor and enhance the local delivery of chemotherapy, thereby minimizing its adverse effects.
Potential advantages as compared to current treatments:
- Focused ultrasound is non-invasive and radiation-free – no incisions, holes in the skull, electrodes in the brain – and therefore has reduced risk for infection and blood clots.
- Precise targeting minimizes damage to non-targeted healthy brain.
- Treatment can be conformed to a wide variety of shapes and sizes.
- Tissue temperature can be monitored in real-time using magnetic resonance imaging (MRI).
- Treatment can be a complement to drug therapy, enabling effective treatment with lower doses of drugs and minimal toxicity.
A current clinical trial is evaluating whether liposomic doxorubicin given prior to focused ultrasound hyperthermia in solid tumors, including neuroblastoma.
A second clinical trial is using thermosenstitive doxorubicin in a variety of tumors, including neuroblastoma.
A third study is using focused ultrasound to ablate recurrent or refractory solid tumors, including neuroblastoma.
Regulatory Approval and Reimbursement
Focused ultrasound treatment for neuroblastoma is not yet approved by regulatory bodies or covered by medical insurance companies.
Preclinical Laboratory Studies
Early-stage preclinical studies suggest that focused ultrasound may play a beneficial role in the treatment of unresectable neuroblastoma. In one study, mice with neuroblastoma were treated with chemotherapy, focused ultrasound plus chemotherapy, or focused ultrasound alone. Following treatment, 53% of mice treated with focused ultrasound and 80% of mice treated with focused ultrasound plus chemotherapy were cured with no evidence of tumor at 200 days, versus 100% fatality at 45 days in the control group and in mice treated with just chemotherapy.
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