[Colorectal cancer: prevention and early detection].

Colorectal cancer is one of the leading causes of cancer associated morbidity and mortality. Main risk factors include advanced age, affected family members, male sex and lifestyle factors. The development of early adenoma to invasive cancer requires 10 and more years. Therefore, prevention via colonoscopy with polypectomy and early detection of asymptomatic stages is possible. Colonoscopy is a diagnostic and therapeutic tool with the highest sensitivity for precancerous lesions and early cancers of the colon. New fecal immunological tests reveal a higher sensitivity for advanced adenoma and cancer than guaiac based hemoccult tests while maintaining a high specificity. Molecular stool and blood tests are promising new developments. However, similar to virtual colonoscopy and colon capsule endoscopy, they have so far not been established as routine instruments for prevention and early detection of colorectal cancer.