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Dr. Dionysiou and team are studying a small molecule naturally found in the body called miR-21. This molecule could make a treatment called allogeneic hematopoietic cell transplantation (allo-HCT), which cures children with aggressive leukemia, safer and more effective. This treatment uses immune cells from a donor, but it can cause a serious problem called graft-versus-host disease (GVHD), where the donor cells attack the patient's healthy tissues. The challenge is to stop this attack without weakening the donor cells' ability to fight the cancer. By understanding how miR-21 controls the immune response, Dr. Dionysiou hopes to find ways to prevent GVHD while allowing the donor cells to attack the cancer, making this life-saving treatment safer and more effective.

This grant is generously supported by the Rays of Hope Hero Fund which honors the memory of Rayanna Marrero. She was a happy 3-year-old when she was diagnosed with Acute Lymphoblastic Leukemia (ALL). She successfully battled ALL, but a treatment induced secondary cancer claimed her life at age eight. Rayanna had an amazing attitude and loved life. She, like so many kids facing childhood cancer, did not allow it to define who she was. This Hero Fund aspires to give hope to kids fighting cancer through research.