The objective of a study by Lee et al. (A-50) was to improve understanding of the biologic behavior of gastric epithelioid stromal tumors. They studied the clinical features, histologic findings, and DNA ploidy of a series of the tumors to identify factors that might distinguish between benign and malignant variants of these tumors and have relevance for prognosis. Fiftyfive patients with tumors were classified on the basis of whether their tumors were high-grade malignant (grade 2), low-grade malignant (grade 1), or benign (grade 0). Among the data collected were the following:

Outcome Number of Outcome Number of (1  Death Days to Last (1  Death Days to Last Tumor from Follow-Up Tumor from Follow-Up Patient Grade Disease) or Death Patient Grade Disease) or Death 20 0 0 3819 41 1 1 450 21 0 0 4586 42 1 1 556 22 0 0 4680 43 1 1 2102 23 0 0 4989 44 1 0 2756 24 0 0 5675 45 1 0 3496 25 0 0 5936 46 1 1 3990 26 0 0 5985 47 1 0 5686 27 0 0 6175 48 1 0 6290 28 0 0 6177 49 1 0 8490 29 0 0 6214 50 2 1 106 30 0 0 6225 51 2 1 169 31 0 0 6449 52 2 1 306 32 0 0 6669 53 2 1 348 33 0 0 6685 54 2 1 549 34 0 0 6873 55 2 1 973 35 0 0 6951