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Differentiated thyroid cancers are the most common endocrine cancers, but there are no reliable molecular markers of prognosis. Pituitary tumor transforming gene (PTTG) plays several potential roles in tumor initiation and progression, including regulating mitosis and stimulating expression of fibroblast growth factor (FGF)-2. Increased expression of PTTG has been demonstrated in follicular thyroid lesions, and expression of this oncogene has been identified as a potential prognostic marker in pituitary adenomas and colon carcinomas. We assessed the expression of PTTG and FGF-2 and its receptor FGF-R-1 in 27 differentiated thyroid cancers, and we compared this with expression in 11 normal thyroids, 25 multinodular goiters, and 13 Graves' disease specimens. We also examined the relationship between gene expression and clinical markers of tumor behavior. PTTG and FGF-2 were overexpressed in thyroid carcinomas (9.5-fold increase, P = 0.003, and 5.0-fold increase, P &lt; 0.001, respectively) compared with normal thyroid. Increased FGF-2 mRNA expression was independently associated with the findings of lymph node invasion (R(2) = 0.71; P &lt; 0.001) and distant metastasis (R(2) = 0.55; P = 0.009) at tumor presentation, after taking into account known prognostic factors such as age and gender of the patient and size and type of the tumor. High PTTG expression was independently associated with tumor recurrence (R(2) = 0.64; P = 0.003). We conclude that PTTG and FGF-2 expression are potential prognostic markers (and perhaps therapeutic targets) for differentiated thyroid cancer.

Pituitary Tumor Transforming Gene and Fibroblast Growth Factor-2 Expression: Potential Prognostic Indicators in Differentiated Thyroid Cancer