I often joke that parenting is more difficult than cancer treatment. Some days I feel that statement holds true, but fatherhood is a challenge that I never take for granted.

In November 2007, I was diagnosed with stage IV Burkitt’s lymphoma, a rare and aggressive type of non-Hodgkin lymphoma. At the time, I was 29, and my wife and I hadn’t yet started trying to conceive.

Fertility preservation before non-Hodgkin lymphoma...