The fittest founder got cancer. Here's how he used AI to fight back.

Conno Christou never left things to chance. He tracked his sleep with a Whoop band and Oura ring, checked nearly 100 biomarkers annually, and followed longevity protocols. In 2025, his checkup results were green across the board. After a workout, his arm swelled; a week later, doctors found blood clots and, during pre-op exams, an 11x11x8 cm mass behind his sternum. Biopsy confirmed a rare, aggressive non-Hodgkin's lymphoma – affecting one in 420,000 people, caused by a random genetic mutation. The tumor existed for about three months; in three more weeks, it would have reached stage four.

His first oncologist recommended a milder chemotherapy regimen. Seeking a second opinion, another doctor suggested a more aggressive continuous infusion, with an 85% success rate versus 60%. Christou gathered 12 opinions in two days; 11 favored the harder path. He took it. During six months of treatment, he wore his Whoop, which accurately predicted immune dips. He kept a symptom journal via voice transcription, logging every side effect. He fed all data – blood results, scans, wearable outputs, journal entries – into Claude, an AI model.

At treatment's end, a PET scan was ambiguous; his oncologist considered radiotherapy. Christou used Claude to analyze all his scans. The AI flagged a likely thymus rebound – a known phenomenon in young patients after chemotherapy, often mistaken for active disease. After four more opinions, doctors confirmed no active disease; radiotherapy was unnecessary. Christou emphasizes that AI didn't replace doctors but helped him ask the right questions and access medical literature, especially for a rare condition. He now takes Sundays off and tries to be present. He believes AI's potential in healthcare is here now, not in a decade.