BMC Cancer 2007, 7:95 http://www.biomedcentral.com/1471-2407/7/95 Competing interests The author(s) declare that they have no competing inter- ests Authors' contributions JZ: Contributions to conception and design, acquisition of data, analysis and interpretation of data. Contributions to draft the manuscript BP: Contributions to conception and design, revise the manuscript for important intellectual content and given final approval of the version to be published. Additional material Additional file 1 Statistical analysis of the difference of VEGF mRNA level. The mean level of VEGF mRNA in ACC-M was significant higher than that in ACC-2. Click here for file [http://www.biomedcentral.com/content/supplementary/1471- 2407-7-95-S1.jpeg] Acknowledgements We thank Professor Chiao and Dr. Peng Bailu for presenting PCMV- IκBαM vector. Dr. Xuepeng Xiong Wang for presenting UVEC cell lines. References 1. Spiro RH: Distant metastasis in adenoid cystic carcinoma of salivary origin. 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