The evidence has been sitting in front of us for 21 years. Researchers just put the final number on it: 50.1 percent. That is how much colorectal cancer mortality fell in the Basque Country of Spain after the region launched a population-wide screening program in 2009. Not in a controlled trial. Not in a hand-selected cohort. In 2.2 million real people, tracked over two decades, through every disruption a real healthcare system encounters.
The tool that drove that result was not a colonoscopy machine or an AI algorithm. It was a mailed stool kit. A fecal immunochemical test - FIT - that detects trace blood in stool and costs roughly $24 to process. Offered every two years to adults aged 50 to 69. Followed by a colonoscopy for anyone who tested positive. That is the entire program.
The study, led by Dr. Luis Bujanda and published August 5, 2026, in JAMA Network Open, analyzed 16,298 cases linked to colorectal cancer from 2004 to 2024. Mortality in the 50-69 age group fell from 39.7 to 19…
