

Rachel Duncker's CFF Breathe Team Story
Fundraising for 2026 Bank of America Chicago Marathon
Rachel Duncker
Why am I running the 2026 Chicago Marathon for the CFF?
After a lifetime of seemingly disconnected and confusing symptoms, a 2017 genetic test revealed that I had two cystic fibrosis mutations in trans -- which indicated a diagnosis of cystic fibrosis.
The months that followed were filled with uncertainty and fear. During that time, I leaned heavily on the resources and community I found through the Cystic Fibrosis Foundation (CFF).
Fortunately, further medical testing revealed that I don’t have the full clinical presentation of CF. Instead, I was diagnosed with CFTR-related disorders — a condition that, in 2017, was newly emerging in medical understanding. Even now, I continue to rely on the CFF to help me navigate this evolving spectrum of disease.
I reflect almost daily on how differently my life could look because of my genetics — and I carry deep respect for the profound impact this disease has on so many lives and families. While my genes didn’t gift me with natural endurance speed, I run to protect my lungs, to safeguard my health, and as a personal expression of gratitude for what my body is capable of.
Running for me is, in many ways, a small miracle — one I don’t take for granted, and one I want to use for the power of good. Please help me in this goal by supporting the CFF.
What is Cystic Fibrosis?
CF is a genetic, life-shortening disease that devastates the lungs, pancreas, and other vital organs. CF makes it difficult to breathe and fight life-threatening infections, often leading to extensive lung damage and respiratory failure.
Every person born with cystic fibrosis is on a unique journey and experiences this challenging disease differently. While progress has been made, a long road lies ahead for far too many people fighting this terrible disease. We need a cure so that everyone with CF has a better chance to live a long, healthy life.
Why support the CFF?







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