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Children’s trial treats recurring malignant brain tumors with ‘double-knockout’ STAT3 inhibitor


ATLANTA, May 28, 2020 – Recurrent or refractory malignant brain tumors are stubborn, unmanageable and resistant to treatment. For kids with these tumors, currently known and recognized standard treatments have failed, and investigational trials remain a limited option. With support from the Peach Bowl LegACy Fund, a $20 million commitment to launch new pediatric oncology clinical trials through Peach Bowl, Inc., and CURE Childhood Cancer, Tobey MacDonald, MD, Director of the Neuro-oncology Program at the Aflac Cancer and Blood Disorders Center of Children’s Healthcare of Atlanta, is now recruiting patients for one such trial testing a new therapy with a powerful molecular target and immunotherapy combination.

The treatment known as WP1066 inhibits STAT3, a cancer stem cell protein that regulates gene activity, while simultaneously activating the immune response. Dr. MacDonald and Co-Principal Investigator Kavita Dhodapkar, MD, Director of Pediatric Immuno-Oncology at Aflac, hope this dual-acting treatment will slow tumor growth, eventually enabling a path to recovery.

“If we hit the stem cells and stimulate the immune system while the inhibited stem cells are in a weakened condition, the immune system, much more powerful now, can potentially come in and eliminate those inhibited stem cells,” said Dr. MacDonald, who is also a professor in the Department of Pediatrics at the Emory University School of Medicine. “We’re aiming for a double knock-out, hitting the stem cells that you need to hit and eliciting an immune response at the same time.”

WP1066, currently being studied in adults at MD Anderson Cancer Center, is the first drug of its kind to pack this powerful double punch. Dr. MacDonald and Dr. Dhodapkar, who is also an associate professor in the Department of Pediatrics at the Emory University School of Medicine, will study it in children with high-grade gliomas at the Aflac Cancer and Blood Disorders Center, including diffuse intrinsic pontine gliomas, medulloblastomas and ependymomas. Together these tumors make up more than 90% of brain tumors in children, and all three have shown cancer-stem-cell dependency on STAT3, a key regulator of brain tumors in children. Children with more rare brain tumors and no effective treatment will also be eligible for the phase 1 trial.

During the study, Dr. MacDonald and Dr. Dhodapkar will try to establish the proper dosage by testing toxicity and the maximum amount tolerated for each liquid treatment given orally, two weeks on and two weeks off, for up to a year. About 20 patients ages three to 25 will be tested over the course of two and a half years. Later, the phase 2 trial will assess WP1066 alone or in combination with another therapy to optimize its effect. The team will also measure immune response after it is given.

“Immune therapy has revolutionized cancer therapy in both adults and kids,” said Dr. MacDonald. “The power of the immune system is far greater than any drug we could manufacture.”

Furthermore, as a targeted treatment, the STAT3 inhibitor will not damage healthy cells along with cancer cells like standard chemotherapy, potentially eliminating unwanted side effects such as nausea and vomiting. Developed by Moleculin Biotech, Inc., WP1066 is the first drug to turn off STAT3 in all types of cancers tested including brain, melanoma, pancreatic and ovarian. Dr. MacDonald discovered the STAT3 stem cell protein over 20 years ago while trying to find the source of a growth factor known as PDGFR.

“The literature has shown for years that STAT3 is critical for supporting the survival of cancer stem cells,” said Dr. MacDonald. “Now we have a drug that may target it.”

For more information:

Julie Jordan

Children's Healthcare of Atlanta

404-785-3823

julie.jordan@choa.org

About Children’s Healthcare of Atlanta

As the only freestanding pediatric healthcare system in Georgia, Children’s Healthcare of Atlanta is the trusted leader in caring for kids. The not-for-profit organization’s mission is to make kids better today and healthier tomorrow through more than 60 pediatric specialties and programs, top healthcare professionals, and leading research and technology. Children’s is one of the largest pediatric clinical care providers in the country, managing more than one million patient visits annually at three hospitals, Marcus Autism Center, the Center for Advanced Pediatrics and 19 neighborhood locations. Consistently ranked among the top children’s hospitals by U.S. News & World Report, Children’s Healthcare of Atlanta has impacted the lives of kids in Georgia, across the United States and around the world for more than 100 years thanks to generous support from the community. Visit www.choa.org for more information.

About Emory University School of Medicine

Emory University School of Medicine is a leading institution with the highest standards in education, biomedical research and patient care, with a commitment to recruiting and developing a diverse group of students and innovative leaders. Emory School of Medicine has more than 2,800 full- and part-time faculty, 556 medical students, 530 allied health students, 1,311 residents and fellows in 106 accredited programs, and 93 MD/PhD students in one of 48 NIH-sponsored Medical Scientist Training Programs. Medical school faculty received $456.3 million in external research funding in fiscal year 2018. The school is best known for its research and treatment in infectious disease, neurosciences, heart disease, cancer, transplantation, orthopaedics, pediatrics, renal disease, ophthalmology and geriatrics.

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