I recently completed radiation therapy, but I’m still waiting to find out if it was successful in destroying a tumor that spread to my lung nearly five years after my initial Ewing’s sarcoma treatment.

As I wait for my follow-up appointment in August, I’m trying to ignore the what-ifs. I’m 37 years old and a mother of five. That alone helps keep me distracted. But I’m also approaching this summer with a plan.

My first Ewing...