Is endoscopic gastric cytology worthwhile? An evaluation of 903 cases of carcinoma.

From 1978 to 1989, 4,772 endoscopic cytological examinations of the stomach have been done in our laboratory, including 903 patients with a final diagnosis of gastric carcinoma. There were seven false-positive results among 3,810 examinations done in patients without malignant disease (specificity 99.8%). Cytology yielded positive results in 785 of 903 carcinomas (sensitivity 86.9%), while biopsies were positive in 826 of 895 cases (sensitivity 92.3%). Both techniques combined resulted in positive diagnoses in 886 of 903 malignancies (sensitivity 98.1%). Cytology was positive in 52 patients with negative biopsies as well as in eight patients in whom biopsies had not been obtained. Thus cytology added 60 positive diagnoses (6.7%) to the overall diagnostic results. These results suggest that endoscopic cytology is useful for avoiding unnecessary delays caused by having to perform repeated endoscopic biopsies. It should be done as a routine procedure in those institutions in which significant numbers of gastric carcinomas are studied and where an experienced gastrointestinal cytology laboratory is available.