[Computer diagnosis of gastric dysplasia and program design]

Two step processes were taken in computer diagnosis of gastric dysplasia. 1. 5 measurement values of dysplastic glandular tube obtained by using image analysis system were taken as the basis for judging the degree of dysplasia. Three glandular tubes of dysplasia were measured in each case. 2. Computer pathology diagnostic program using BASIC language ran in IBM computer. 5 parameters were input into computer for three stage-diagnosis. The first stage: 5 parameters were counted basing on three models to obtain three values which reflected the objective feature of the same glandular tube from different aspects. The second stage: diagnosis of a dysplastic glandular tube was obtained depending on the three values judged synthetically. Variate 'N' was introduced for controlling the first and second stage diagnosis of the three glandular tubes. The third stage diagnosis started as soon as N = 3. The third stage: diagnostic values of three glandular tubes were balanced and analysed depending on diagnostic criteria to reach the final diagnosis.

[Morphologic measurement for diagnosis of gastric dysplasia]

Gastric dysplasia is a very important precancerous change recognized only by histological examination. The objective indexes of diagnosing the dysplastic change are hardly established. It is desirable to translate enumeration data of histopathology into measurement data in order to obtain objective measurement criteria for the diagnosis of gastric dysplasia. In this paper, three measurement indexes N/C, P1/D1 and P2/D2 are proposed. N/C represents the ratio of nucleus and cytoplasm, showing the cellular atypia. P1/D1 represents the ratio of outer perimeter of the measured glandular tube and diameter of an equivalent circle, showing the structural atypia. P2/D2 is the ratio of perimeter of the irregular shape by tracing the end of the nuclei near the lumen of the tube and diameter of an equivalent circle, showing both cellular and structural atypia. The results indicate that these three measurement criteria can be taken as the objective indexes for diagnosing gastric dysplasia and predicting its potential malignancy.

[Immunocytochemical study of monoclonal antibody 83YH2 in stomach cancer]

Using the avidin biotin complex (ABC) immunocytochemical stain, 97 cases of stomach cancer were examined for monoclonal antibody 83YH2. The positive rate was 82.47% (80/97) in stomach cancer with various types of differentiation. Some gastric epithelial cells and intestinal metaplastic cells near the cancer foci also showed weak positivity. But 83YH2 was not detected in normal human tissues. In the same stomach cancer cases, CEA test was also performed. The positive rate and distribution of CEA was almost similar to that of 83YH2, despite the fact that it was verified, by the immunoblock test, that 83YH2 was a different antigen. The results show that 83YH2 is an associated antigen of stomach cancer.