[Expression and significance of macrophage migration inhibitory factor in gastric adenocarcinoma].

Objective: To investigate the expression of MIF on the gastric adenocarcinoma, evaluate the relation between the MIF expression and tumor differentiation, lymph node metastasis and other clinical patho-features.
Methods: 120 gastric adenocarcinoma cancer tissues, 40 tissues besides cancer and 40 common mucosa tissues specimens are collected. Detect the expression of MIF with immunohistochemistry method (Streptavidin-Peroxidase).
Results: Positive rate of MIF expression in gastric cancer is 80.8% (97/120). Those in poorly differentiated, moderately differentiated and well-differentiated gastric adenocarcinoma are 97.5% (39/40), 82.5% (33/40), 62.5% (25/40), analytical factor of Spearman rank correlation r(s) is 0.458 (χ(2) = 27.046, P < 0.001). Positive rate of MIF expression in tissues besides cancer is 40% (16/40) and that in normal gastric mucosa is 7.5% (3/40). Positive rate of MIF expression in gastric adenocarcinoma without lymph node metastasis is 40% (22/55) and the rate with lymph node metastasis is 67% (44/65).
Conclusions: There is overexpression of MIF in the gastric adenocarcinoma. Expression of MIF in different differentiated cancer is different. Expression in poorly differentiated is higher than that in moderately differentiated and well-differentiated cancer. The level of expression of MIF malignancy has positive correlation with malignancy degree of gastric adenocarcinoma. MIF expression has nothing to do with age, gender, tumor sizes or location.