[New approaches to early detection, estimation of prognosis and therapy for malignant tumours of the gastrointestinal tract].

Tumours of the gastrointestinal tract are the single largest group of malignant tumours of humans accounting for approximately 2 million new cases and over 1.2 million deaths annually. They are most commonly a disease of the elderly, and their relative and absolute frequency will rise continuously due to an ageing population. This explains why the prevalence of gastric cancer increases in spite of a decreasing incidence. Gastrointestinal tumours will remain a major clinical and health economical challenge. The prognosis is often dismal. Most of these cancers are diagnosed in an advanced stage, which prohibits curative treatment and limits treatment options. In order to circumvent these problems, we need to develop strategies that allow identification of at-risk patients and tumours at an early stage, and raise the compliance in the general population for screening programmes. There is a great need in clinics for prognostic and predictive biomarkers that are able to tailor patient treatment at different stages of the disease.