Kirsi Jahnukainen

We are excited to introduce you to Kirsi Jahnukainen, Professor of Pediatrics at University of Helsinki and senior consultant at Helsinki Children’s Hospital. As a pediatric hematologist-oncologist, her work specializes in fertility preservation in children and young cancer patients. Her research focuses on the long-term effects of childhood cancer treatments, with a particular emphasis on their impact on fertility.

How did you find your way into the field of fertility preservation?

Working in pediatric oncology, I saw that more children were surviving cancer, but many faced long-term side effects such as infertility. This made it clear that survival alone is not enough—we also need to protect quality of life. That realization led me to focus on fertility preservation and research ways to protect reproductive function in young patients.

 

If you had to choose a different field than fertility preservation, which field would you choose and why?

I would likely still work in pediatric medicine, perhaps focusing more broadly on pediatric oncology or survivorship. These areas are closely connected, and improving long-term outcomes for children with serious illnesses has always been central to my work.

 

What moment in your career had the biggest impact on you? Or which achievement are you most proud of?

An important part of my career has been contributing to the development of fertility preservation practices for children with cancer, particularly through Nordic collaboration. Helping to establish clinical approaches and increase access to fertility preservation options for young patients is something I value highly.

 

What do you enjoy most about your job?

I enjoy combining clinical work with research. It is rewarding to care for patients while also working to improve their future health and quality of life. Seeing research translate into real clinical benefits, especially in preserving fertility, is particularly meaningful.

 

What advice would you give to your younger self (or to early-career researchers/clinicians)?

I would encourage focusing on areas where there is still an unmet clinical need and being open to collaboration. Progress in medicine often comes from combining different perspectives and working across disciplines. Persistence and curiosity are also very important.