A 49-year-old triathlete suddenly lost vision in one eye. He was diagnosed with stage 4 lung cancer, despite never smoking.

Dave Nitsche, a non-smoking triathlete, experienced sudden vision loss in one eye and was diagnosed with stage 4 lung cancer that had spread to his eye, bones, liver, kidneys, and brain. Despite a 1-2 year life expectancy prognosis, he surpassed the prediction at age 57 through targeted therapies and a high VO2 max from his active lifestyle.