Abstract
Objective: The lower resolution of the transnasal endoscope (TNE) than that of the conventional endoscope (CE) continues to be discussed as a problem of TNE. We examined temporal changes in gastric cancer detection rates using TNE in our health check-up center and assessed the diagnostic capability of TNE.
Methods: We performed 18,032 examinations using TNE in our health check-up center from October 2004 to March 2012, and investigated gastric cancer detection rates and false negative rates in this period. The following models of TNE were used: EG-470N5, EG-530N. EG-530N2, EG-530NW, EG-580NW.
Results: Detection rates of gastric cancer in individual years were 0% (2004, 2005), 0.20% (2006), 0.26% (2007), 0.27% (2008), 0.14% (2009), 0.10% (2010) and 0.23% (2011). The overall detection rate was 0.19%, the rate of early gastric cancer was 82% and the overall false negative rate was 35.3%.
Conclusions: The detection rate of gastric cancer using CE was 0.22% in the same period, not significantly different from the rate for TNE. Also as the false negative rate of 35.3% was almost the same as that of other studies, we consider there is no difference in diagnostic capability between TNE and CE. However, we predict that the detection rate of gastric cancer will gradually decrease and the false negative rate increase in mass screening of the working population because the Helicobacter pylori infection rate has been decreasing in younger people.
