When our son Lue was about 18 months old, we noticed he was sweating a lot. He was a happy toddler with no other visible symptoms. But when we had him checked by a doctor in Denmark, a lab test showed his blood counts were off. An ultrasound revealed neuroblastoma in his stomach and spine.

In 2015, Lue started chemotherapy followed by surgery in Denmark. At the time, there were no proton...