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The purpose of these studies was to explore the expression pattern of miRNAs associated with invasion and metastasis of human papillary thyroid carcinoma (PTC). A transwell invasion chamber was used to select progressively more invasive cancer cell populations from a clonal cell line of human PTC with cervical lymph node metastasis, IHH-4. Three sublines with progressive invasiveness, designated IHH-4M-1, IHH-4M-2 and IHH-4M-3, were obtained through this in vitro selection process. The sublines manifested an increase in colony-forming ability on soft agar and metastatic potency in nude mice. Then metastasis-related miRNAs differentially expressed between them were analyzed utilizing the miRNA microarray technique. We found that 11 metastasis-related miRNAs were differentially expressed between the invasive subpopulations and their control subpopulations; these miRNAs may account for their significant difference in the invasion capabilities and favor lymphatic metastasis of PTC.

miRNA Expression in a Human Papillary Thyroid Carcinoma Cell Line Varies with Invasiveness