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Background:AIB1,a new oncogenic coactivator,is commonly overexpressed and amplified in variety of human cancers.The status of AIB1 expression in papillary thyroid carcinoma (PTC) and its clinical significance are unclear.Methods:in this study,AIB1 expression in PTC was examined by immunohistochemistry using tissue microarrays comprised of 90 PTC specimens and 20 normal thyroid tissue specimens.