News Release

Cleveland Clinic research proves feasibility of new cancer treatment approach

New radiation planning technique designed to reduce toxicity now shown to be safe and feasible

Peer-Reviewed Publication

Cleveland Clinic

Researchers from Cleveland Clinic and OhioHealth have published results from a first-in-human trial evaluating feasibility of Temporally Feathered Radiation Therapy (TFRT), which is designed to reduce the toxicity of radiation treatment.


The research, appearing in Radiotherapy & Oncology, proved TFRT’s feasibility in clinical workflow. Additionally, assessments of treatment toxicities and radiation dosage comparisons to a standard radiotherapy plan were described.


TFRT is a novel technique for the planning and optimization of radiotherapy that considers the nonlinear aspects of normal tissue repair to manage toxicity. The technique is designed to reduce radiation-induced toxicities by optimizing the time through which radiation is delivered and consequently improves normal tissue recovery. Radiation-induced toxicity is a major contributor to impacting a patients' quality of life and often a dose-limiting factor in the treatment of cancer with radiation therapy.


“We are excited that the complex TFRT technique, which uses current planning systems, was able to be delivered safely and in a standard clinical workflow,” said Jacob G. Scott, M.D., DPhil, a Cleveland Clinic radiation oncologist and the inventor of TFRT. “A larger trial with toxicity as the primary endpoint will allow us to truly study the efficacy of the approach. Collaboration will be important as we work to integrate TFRT into planning systems to expand automation and wider adoption into clinical practice.”


In this study, five patients with head and neck squamous cell carcinoma were treated with TFRT. The primary endpoint was feasibility of TFRT planning as defined by radiation start within 15 days of treatment planning. Secondary endpoints included estimates of toxicity.


The primary endpoint was met when patients were successfully treated with TFRT techniques without causing delays in radiation commencement. For patients who received TFRT, the median time from treatment planning to radiation start was 10 business days – not outside of standard timelines. The average time required for radiation planning was six days. The organs feathered included oral cavity, each submandibular gland, each parotid gland, supraglottis, and posterior pharyngeal wall. There were no significant deviations from standard planning, and toxicity was no more than expected – but we expect a larger trial to show reductions in toxicity without effecting cure rates.


“Radiation oncologists and physicists have made amazing advances in shaping the radiation dose to organs and tissue near a patient’s tumors, leading to effective treatments with less toxicity,” added Shireen Parsai, M.D., a radiation oncologist at OhioHealth who led this research during her residency at Cleveland Clinic. “TFRT takes advantage of the differential repair of tumors vs. healthy tissue by modulating how the dose is delivered to nearby tissue over time. This approach gives normal tissue more time to heal, allowing us, in theory, to deliver the same curative doses of radiation with less detriment to the patient’s quality of life.”



About Cleveland Clinic

Cleveland Clinic – now in its centennial year – is a nonprofit multispecialty academic medical center that integrates clinical and hospital care with research and education. Located in Cleveland, Ohio, it was founded in 1921 by four renowned physicians with a vision of providing outstanding patient care based upon the principles of cooperation, compassion and innovation. Cleveland Clinic has pioneered many medical breakthroughs, including coronary artery bypass surgery and the first face transplant in the United States. U.S. News & World Report consistently names Cleveland Clinic as one of the nation’s best hospitals in its annual “America’s Best Hospitals” survey. Among Cleveland Clinic’s 70,800 employees worldwide are more than 4,660 salaried physicians and researchers, and 18,500 registered nurses and advanced practice providers, representing 140 medical specialties and subspecialties. Cleveland Clinic is a 6,500-bed health system that includes a 173-acre main campus near downtown Cleveland, 19 hospitals, more than 220 outpatient facilities, and locations in southeast Florida; Las Vegas, Nevada; Toronto, Canada; Abu Dhabi, UAE; and London, England. In 2020, there were 8.7 million total outpatient visits, 273,000 hospital admissions and observations, and 217,000 surgical cases throughout Cleveland Clinic’s health system. Patients came for treatment from every state and 185 countries. Visit us at Follow us at News and resources available at


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