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[Anti-tumor effect of chemotherapeutic drugs on human gastric cancer cells in vitro and the relationship with Bcl-2 expression].

OBJECTIVE
To evaluate in vitro anti-tumor effect of chemotherapeutic drugs on human gastric cancer cells, and investigate the relationship with Bcl-2 expression.


METHODS
Single cell suspension was prepared from fresh gastric cancer tissue and exposed to taxol (Tax), 5-fluorouracil (5-FU), cisplatin (CDDP), adriamycin (ADM), mitomycin (MMC) respectively for 48 hours. Metabolic activity and inhibitory rate of cells were detected by MTT assay. Expression of Bcl-2 was examined with immunohistochemistry.


RESULTS
The inhibitory rates of cancer cells exposed to chemotherapeutic drugs were different and Tax, 5-FU, CDDP had remarkably higher rates than ADM and MMC. The lower differentiated gastric cancer cells were more sensitive than the higher ones. Positive expression rate of Bcl-2 was 80% and the positive cells showed resistance to 5-FU, ADM and MMC.


CONCLUSIONS
Chemosensitive testing by MTT assay can constitute the prediction for the application of chemotherapeutic drugs individually. Overexpression of Bcl-2 may contribute to multiple drug-resistance of tumors.