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Department of Molecular Biology, Institute of Gerontology, Nippon Medical School, 1-396, Kosugi-cho, Nakahara-ku, Kawasaki 211-8533, Japan
¹ Kanagawa Prefectural Cancer Center, 1-1-2, Nakao, Asahi-ku, Yokohama 241-0815, Japan
² Department of Surgery, Nippon Medical School and
³ Ito Hospital, 4-3-6, Jinguumae, Shibuya-ku, Tokyo 150-8308, Japan
⁴ Laboratory for Medical Informatics, RIKEN, 22-7-1, Suehiro-cho, Tsurumi-ku, Kanagawa 230-0045, Japan
⁵ Laboratory of Molecular Medicine, Human Genome Center, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan

(Requests for offprints should be addressed to M Emi; Email: memi{at}nms.ac.jp)

Little is known about the genetic mechanisms of anaplastic thyroid cancer (ATC). This is the most virulent of all human malignancies, and it is believed to result from transformation of differentiated thyroid cancers. To identify a set of genes involved in the development of ATC, we investigated expression profiles of 11 cell lines derived from ATC using a cDNA microarray representing 25 344 genes. Semi-quantitative RT-PCR experiments carried out for some genes that had shown altered expression on the microarray verified frequent over-expression of destrin, HSPA8, stathmin, LDH-A, ATP5A1, PSMB6, B23, HDP-1 and LDH-B, and frequent under-expression of thyroglobulin, PBP and c-FES/FPS genes among the cell lines and also among ten primary ATCs. In addition to mRNA expression studies, up-regulation of GDI2, destrin and stathmin were confirmed with immunohistochemical analysis. The extensive list of genes identified provides valuable information towards understanding the development of ATC, and provides a source of possible biomarkers for diagnosis and/or molecular targets for the development of novel drugs to treat ATC.

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