Just weeks before 2-year-old Harlow was supposed to head to Jamaica to be the flower girl at her parents’ wedding, her mother noticed that her usually energetic daughter had developed a cough and grown lethargic. Her care team suggested she may have a mild viral infection and also suspected a heart murmur. But during the trip, Harlow’s condition began to worsen. The family flew her home and took her to UChicago Medicine Comer Children’s Hospital, where a blood test revealed she had a rare form of acute lymphoblastic leukemia, a cancer of the bone marrow and blood. As Harlow prepared for her inpatient stay at Comer Children’s, her family was comforted not only by her oncology team’s confidence but also by the investigative therapies and established treatments offered by leukemia specialists. Harlow’s smile never dimmed, and she remained resilient even when an uncommon chemo allergy required her to be intubated. Twenty-eight months later, she rang the bell to signify the end of her cancer treatment. Today, Harlow is a healthy 5-year-old who loves to cook with her family and watch “Family Feud.” Even better, she’s still smiling.