[A preliminary study of endoscopic ultrasonography in the preoperative staging of early gastric carcinoma]

Abstract

Objective: To study the clinical value of endoscopic ultrasonography (EUS) in the preoperative staging of early gastric carcinoma.

Methods: EUS was performed in 149 gastric carcinoma patients proved by biopsy (including 33 patients with early gastric cancer), of which the results were compared with postoperative pathologic findings.

Results: The accuracy of EUS in determining the T stage of gastric carcinoma was 80.3% (T1 81.8%, T2 70.4%, T3 88.9%, T4 71.4%). The accuracy of EUS in differentiating early gastric carcinoma from advanced ones was 95.1%, and the accuracy of EUS in differentiating mucosal cancer from submucosal cancer was only 63.6%. The diagnostic accuracy of EUS for mucosal and submucosal cancer was 52.9% and 75%, with positive predictive value of 90% and 70.6%, respectively. The accuracy of invasion depth of EUS for the bulging and flat type of early gastric carcinoma was 100%, whereas the accuracy was only 58.6% for the depressed type. The accuracy of invasion depth of the differentiated and undifferentiated early cancer was 71.4%and 57.9%, without any significant difference (P > 0.05). The accuracy of invasion depth of EUS for early gastric carcinoma decreased as tumor size increased. The diagnostic accuracy of lymph node status of early gastric carcinoma by EUS was 90.9%, and the sensitivity and specificity of lymph node metastasis was 66.7% and 96.3%, respectively.

Conclusion: The clinical value of endoscopic ultrasonography in the preoperative staging of early gastric carcinoma is relatively high.