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AIM: To investigate the expression patts of esophageal squamous cell cancer deregulated genes in mid to late stages of C57BL/6J mouse embryogenesis, and the correlation between these genes in embryonic development and tumorigenesis of esophageal squamous cell cancer.METHODS: Reverse north screening was performed to examine the expression patts of esophageal cancer deregulated genes in C57BL/6J mouse embryogenesis. To confirm the gene expression patts, semi-quantitative reverse transcriptase-polymerase chain reaction (RT-PCR)was carried out for 3 of the randomly picked differentially expressed genes.RESULTS: Within these esophageal cancer deregulated genes, 4 patts of expression were observed at 3 stages embryonic d 11.5 (E11.5), embryonic d 13.5 (E13.5) and postnatal d1 (P1). (1) Up-regulation during the E11.5 period,down- regulation during the E13.5 and P1 period (up-downdown), the 10 up-regulated genes during the E11.5 period could be classified into 6 known genes and 4 unknown genes.The known genes included differentiation related genes (SL00A8), immunity related gene (IGL), translation and transcription regulation genes (RPL15, EEF1AL), cytoskeletal protein (TUBA1), cysteine protease inhibitor (cystatin B).(2) Up-regulation during the E13.5 and P1 period (downup-up), such as the SPRR2A which was down-regulated at E11.5. (3) Down-regulation during the E11.5 and E13.5 period (down-down-up), such as RHCG and keratin 4. (4) Fluctuating expression, down initially, up at E13.5, and then down again (down-up-down). EMP1 belonged to such a gene, which was highly expressed at E13.5.CONCLUSION: The results will be helpful for understanding the function of esophageal squamous cell carcinoma (ESCC)deregulated genes in embryonic development and tumorigenesis. S100A8 and S100A9 may play different roles in early embryonic development. IGL may be an oncofetal protein, and EMP1 relates with neurogenesis at E13.5. The genes identified pertinent to embryonic development may serve as candidate susceptibility genes for inherited esophageal cancer disorders as well as for various heritable disorders of embryonic development.