Dave Nitsche, 57, was diagnosed with stage 4 lung cancer despite being a highly active non-smoker with no family history of lung cancer. Dave Nitsche At 49, triathlete Dave Nitsche experienced sudden vision loss in one eye. He was diagnosed with stage 4 lung cancer and told he had a maximum life expectancy of 2 years. At 57, he surpassed the prognosis, thanks to treatment and a high VO2 max from his lifestyle. At 49, Dave Nitsche was the picture of great health. A project manager for a Toyo...