Endodrill vs. Conventional Biopsy. Diagnostics and Genetic Analysis

Endodrill is a new instrument for biopsy sampling in the GI-channel. The purposes of this study are as follows: * Compare the Endodrill instrument with conventional biopsy forceps in terms of ability to establish the correct diagnosis based on collected biopsies of tumors in the upper GI tract. * Based on the quality of the collected tissue samples we want to evaluate which instrument generates the most useful material for genetic studies of the tumor.