Abstract

Gastrointestinal stromal tumors are notorious for their unpredictable clinical behavior. To assess the cellular proliferating activities, four different methods were used: mitotic count, nucleolar organizer region(AgNOR) staining, immunostaining of proliferating cell nuclear antigen (PCNA) and DNA ploidy were used on 39 cases of gastrointestinal stromal tumors. Additionally, we analysed cellularity, cellular atypism and necrosis. Among 39 cases of gastrointestinal stromal tumors, 11 cases were diagnosed as benign lesions according to clinicopathologic findings. Malignant lesions were arbitrarily classified into low grade(n=ll) and high grade(n=17) on the basis of absence or presence of recurrence, metastasis or tumor-related death during the follow-up period. Numbers of mitosis, AgNORs, PCNA index and DNA ploidy were correlated with grades of tumor and prognosis. Among them, AgNORs counting appeared to be the most useful in predicting prognosis. Numbers of mitosis, PCNA index and DNA ploidy showed varying degrees of overlap among the 3 groups. Among the histological parameters, cellular atypia showed some relationship with the prognosis that others did not reveal.

• Keywords: Gastrointestinal stromal tumor;Mitosis;AgNORs;PCNA;DNA ploidy;