Frequent CEA measurements in follow-up of colorectal carcinoma.

Interventions: After randomization at hospital level, all patients in that hospital will participate in the new follow-up scheme. This consists of increasing of the frequency of CEA measurement, and of performing an additinal CT scan if CEA values has risen significantly.
All patients in the intervention group will be imported in a software program, which exactly follows all CEA values and gives information on rise in CEA. Thereby the program is able to inform the patients of their CEA values quickly. Using this software has shown to reduce the incidence of hospital visits for patients.
Primary outcome(s): The percentage of curatively treatable recurrent or metachronous metastatic disease in the intervention group in comparison with the control group.
Study Design: Randomized controlled trial, Single blinded (masking used), Active, Crossover