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Based on progress to date, Dr. Chavez was awarded a new grant in 2022 to fund an additional year of this Scholar grant. Researchers have found that some very aggressive cancers produce extra pieces of DNA that are located outside of our 23 chromosomes and form circles. This is why we call them circular extrachromosomal DNA, or ecDNA. These ecDNAs are thought to be a fundamental driver of cancer growth. However, very little is known about ecDNA in childhood brain tumors. This is why researchers have now looked for ecDNA in medulloblastoma- a cancerous brain tumor that starts in the lower back part of the brain, called the cerebellum. Medulloblastoma can occur at any age, but most often occurs in young children. Though medulloblastoma is rare, it's the most common cancerous brain tumor in children. And indeed, we have observed that there are very specific types of ecDNA in medulloblastoma tumors, especially in those tumors that are very aggressive and difficult to treat. As the Hannah's Heroes St. Baldrick's Scholar, Dr. Chavez would like to learn more about ecDNAs in medulloblastoma and hopes that this will lead to a scientific revolution in how some of the most difficult-to-treat childhood brain tumors are understood and treated.

This grant is named for Hannah’s Heroes, a Hero Fund established to honor Hannah Meeson. At age six she was diagnosed with anaplastic medulloblastoma. After a relapse and several additional months of treatment, Hannah currently shows no evidence of disease. Throughout her treatments, Hannah never complained and remained positive and happy. This fund pays tribute to her fight by raising awareness and funding for all childhood cancers because kids like Hannah “are worth fighting for.”

This grant was awarded at the University of California, San Diego, and transferred to Sanford Burnham Medical Research Institute.