Speeding up the delivery of radiation therapy to enhance patient outcomes
Jing Zeng, MD, vice chair of Clinical Affairs in the Department of Radiation Oncology at the UW School of Medicine and a professor in the Radiation Oncology Division at Fred Hutch, is pioneering a form of radiation therapy for solid tumors known as FLASH radiation.
She will use her three-year, $1,050,000 Kuni Foundation grant to complete preclinical research in mouse models and to design and launch a Phase 2 clinical trial focused on patients with lung and liver cancers.
Radiation as a form of treatment for solid tumors has been around since X-rays were first used to treat cancer over a century ago. However, radiation treatments can cause significant side effects, as the high-energy electromagnetic waves begin to dissipate as soon as the waves hit human tissue. While the target tumor still receives a radioactive dose that can help mutate tumor DNA so that it can no longer divide, radiation therapy can also induce unwanted changes in healthy tissue.
Proton therapy uses positively-charged particles found in the nucleus of atoms to deliver radiation with far fewer side effects than traditional radiation therapy. FLASH radiation is proton therapy with a twist: it is delivered 1,000 times faster than current proton therapy protocols.
“Technology has improved to the point where we know exactly how to change the speed at which we deliver radiation, as well as the amount of energy harnessed in the beam,” Zeng explained. “These variables determine how far the beam of radiation travels before it stops. FLASH therapy delivers radiation much faster than existing proton therapy, and we’ve shown in mouse models that it leads to far fewer side effects.”
Zeng has previously received research support from the Kuni Foundation, including an Imagination Grant in 2020 and a Discovery Grant in 2021. Her current project builds upon findings from her earlier Kuni Foundation-funded research.
“Our initial Kuni grant in 2020 helped us launch our research program into this ultra-high-dose-rate radiation protocol,” Zeng said.
Enabling the brain’s natural immune system to fight cancer before it starts
Stopping metastasis, where cells detach from their original location, lodge into other organs, and begin to divide, is a critical goal in cancer treatment. Metastasis to the brain is particularly difficult to treat, with mortality rates nearing 100% and life expectancy measured in months.
Fred Hutch's Cyrus Ghajar, PhD, who holds the Peter S. Lefkarites Memorial Endowed Chair and is director of the Center for Metastasis Research eXcellence (MET-X), will use a three-year, $1,050,000 grant from the Kuni Foundation to examine whether a type of brain cell known as microglia could be activated to seek out and destroy cancer cells in the brain before they develop into metastases.
His collaborators include Evan Newell, PhD, a professor in the Vaccine and Infectious Disease Division; Aakanksha Singhvi, PhD, an associate professor in the Basic Sciences Division; and Sara Hurvitz, MD, the head of hematology and oncology at Fred Hutch and UW who holds the Smith Family Endowed Chair in Women’s Health.
Because of the blood-brain barrier, disease-fighting T cells do not travel to the brain as often as they do to other organs to seek out and destroy cancer cells.
In the brain, this immune-system function is performed by microglia.
In a prior experiment, Ghajar’s team observed live mouse brains with dormant cancer cells in a process known as intravital imaging. They thought astrocytes, which normally deposit proteins that can drive cells into a dormant state, were keeping the cancer cells at bay. By pointing the intravital imaging laser at the astrocytes, they thought the cells would die and the neighboring cancer cells would start multiplying.
“But that’s not what happened,” Ghajar explained.
Instead, the cancer cells themselves died. They concluded that the astrocytes themselves were preventing microglia from attacking the dormant cancer cells. Ghajar’s project will aim to uncover the mechanism by which astrocytes appear to keep the microglia from performing their natural role in the brain’s innate immune system.
“This could be a totally new way of unleashing the immune system in the brain to eliminate these dormant cancer cells,” Ghajar said. “If we’re successful, we’ll have cancer survivors who don’t have to worry about brain metastases anymore.”
This is Ghajar’s first grant funded by the Kuni Foundation. He noted that in a challenging environment for the life sciences, support from private foundations is critical to keep lifesaving research going.
“It’s enabling science to happen that otherwise wouldn’t be able to happen,” he said.