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Gastric cancer is currently an important clinical and social problem. TRIMprob is a portable system for the non-invasive diagnosis of gastric cancer, designed to differentiate between normal and pathological tissues on the basis of their electromagnetic characteristics. The aim of our study was to evaluate the accuracy and feasibility of use of the TRIMprob system in diagnosing gastric neoplasms. From January to September 2006 we screened 28 symptomatic patients with TRIMprob; afterwards they underwent an endoscopic and bioptic examination. On the basis of the histological diagnosis these patients were divided into 2 groups: group A (patients with a diagnosis of gastric malignancies) and group B (patients with inflammatory disease). There also was a group C, which was a control group of 15 asymptomatic volunteers. The TRIMprob system located all cases of gastric cancer (group A) with 100% sensitivity, specificity and accuracy. The TRIMprob examination seems to be extremely accurate in diagnosing gastric malignancies. If these results are confirmed, TRIMprob could be used for the early diagnosis of gastric cancer and for selecting symptomatic subjects for gastroscopy.