The malignant transformation of human embryonic lung fibroblasts (HELF) induced by glycidyl methacrylate (GMA) in vitro was used as a model for comparing gene expression between the transformed cells and controls. Using mRNA differential display PCR(DD-PCR) technique, the three cDNA fragments up-regulated in the transformed cells were identified and highly homologous to human breast cancer transcription factor(ZABC1), Tbx3 and mouse ubiquitin conjugating enzyme(E2) gene. These results suggest that activation or inactivation of genes including ZABC1, Tbx3 and E2 may be involved in GMA-induced transformation.