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Episode · Jul 31, 2026 · 1 hr 34 min

One Life, Two Hearts: Surviving Cancer, Loss and Heart Failure

with Dr. Dawn Mussallem

Dr. Dawn Mussallem is an integrative oncologist and endurance athlete who survived lymphoma, advanced heart failure and a heart transplant.

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“I had no fear.”
Dr. Dawn Mussallem

Summary

Mussallem was studying medicine when she collapsed and doctors found a 15-centimeter tumor around her heart. She continued studying and training during chemotherapy, a bone marrow transplant and radiation, graduating first in her class even as treatment damaged her heart. She and Ken trace the years that followed through fertility concerns, an unexpected pregnancy, postpartum heart failure, her husband's sudden death and worsening organ function.

After her transplant, Mussallem explains how a donor heart carrying hepatitis C could still be used and what recovery demanded. They also discuss practical heart and cancer risk measures, including fiber, strength training, VO2 max, screening and symptom treatment. She describes integrative oncology as adding support for nutrition and quality of life alongside medical treatment, and reflects on the responsibility she feels to use her second life well.

Show notes

Dr. Dawn Mussallem was a young medical student when she collapsed and doctors discovered a 15-centimeter tumor wrapped around her heart. She was diagnosed with stage IV diffuse large B-cell lymphoma and told she had only months to live.

She endured chemotherapy, a bone marrow transplant and radiation while continuing medical school, eventually graduating first in her class. But surviving cancer came at another cost: the treatment severely damaged her heart.

Dawn developed advanced heart failure, received a pacemaker and defibrillator, lost her husband to sudden cardiac death and spent years fighting to stay alive for her daughter. In 2021, with her organs beginning to fail, she accepted a donor heart from a woman who had used intravenous drugs and carried hepatitis C.

That transplant gave Dawn a second life.

Now an integrative oncologist, endurance athlete and Chief Medical Officer at Fountain Life, Dawn joins Ken Rideout to share what she learned through cancer, grief, heart failure and transplantation. They also discuss the fundamentals of longevity that matter most, including fiber, complex carbohydrates, strength training, VO2 max, heart-disease screening, organ donation and the role of nutrition in cancer survivorship.

This is a story about accepting what you cannot control, refusing to surrender your purpose and making every day of a borrowed life count.

Read the transcript

Transcript

Made from YouTube's automatic captions and lightly corrected, so a few words and names may be off. Click a time to play the video from there.

Ken Rideout

All right, today's special guest, one of my favorite people in the whole wide world. One of the most impressive people I know as well. Cancer survivor, heart transplant recipient, marathon runner, oncologist, like everything. The great Dr. Dawn. Dr. Dawn, thanks for being here.

Dr. Dawn Mussallem

Ken, it's such an honor. We've been We talked about this date probably three years, two two and a half, three years ago. So, it's exciting to be here. I have a lot of energy, so I'm going to try to like tone it down.

Ken Rideout

No, don't tone it down. You give me energy when I see you. I was I kind of dragging. It's hot and humid here. I ran hard this morning and I was like, "Oh, I'm really tired." Soon as you walked in, I was like full of life.

Dr. Dawn Mussallem

I love it.

Ken Rideout

You uh bring out the best in me and others. So,

It's an honor to have you here.

Dr. Dawn Mussallem

Well, thanks for the good work you do and thank you for the opportunity to spread this message. I'm really honored to be here and likewise on the energy. And I just the minute I met you, just how you live with such conviction and such purpose and meaning. That is what we all want to grab a little bit of.

Ken Rideout

Well, it's worth noting. I spent 10 years living like a loser and addicted to drugs and avoiding reality. So, I've got a lot of ground to make up for. But, let's talk about you. Where'd you grow up?

Key takeaways

  • Exercise gave Mussallem a sense of agency during cancer treatment and long hospital stays.
  • A donor heart can save a life even when the donor history raises difficult questions.
  • She emphasizes fiber, strength work and aerobic capacity as practical parts of long-term health.
  • Screening and attention to symptoms matter even for people who are young and active.
  • Integrative oncology can address nutrition and quality of life alongside cancer treatment.

Nowhere to Hide

A weekly letter from Ken Rideout about doing the uncomfortable part, and the reasons we use to avoid it.

It starts with 3 Days, 3 Hard Things: one short story from Ken and one hard thing to do, every day for three days. Then one letter a week.