This document discusses the colorectal cancer screening program in the Basque Country. It achieved a high participation rate of 43% through measures like home delivery of screening kits, collection at health centers, and results communication to physicians and homes. The screening found premalignant and malignant lesions in 9.4% of participants. Colonoscopies on positive screens detected cancer in 3.9 per 1,000 and had a low complication rate of 1.09%. The screening program was found to be cost-effective.