High Expression of Yes-activated Protein-1 in Papillary Thyroid Carcinoma Correlates With Poor Prognosis

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Abstract

Context:

The Hippo signal transduction pathway is highly conserved in mammals. It plays a critical role in tissue and organ size by regulating the balance between cell proliferation and apoptosis. However, there have been few reports concerning Yes-activated protein-1 (YAP-1) elevation in papillary thyroid cancer (PTC).

Objective:

The objective of this study was to determine whether YAP-1 expression is a biomarker and high-risk clinicopathologic prognosticator in PTC.

Design:

A large series of patients of PTC with a long follow-up were investigated for YAP-1 expression.

Setting:

Our study was carried out in the laboratory of breast and thyroid and Department of pathology.

Patients or Other Participants:

Immunohistochemical staining was performed on 240 patient-derived PTC specimens to analyze the correlation of YAP-1 expression with clinicopathologic features and prognosis in patients with PTC.

Intervention:

The 240 PTC patients were immunohistochemically assessed for YAP-1 expression.

Outcome Measures:

Kaplan-Meier analysis was conducted to assess recurrence-free survival (RFS). Univariate and multivariate analyses were conducted to determine prognosticators of RFS.

Results:

YAP-1 expression was observed in 62.1% of PTC tumors. There were significant positive correlations between YAP-1 expression and tumor size, lymph node metastases, extrathyroidal extension, and tissue infiltration. YAP-1 expression was significantly associated with RFS. Univariate analysis revealed that YAP-1 expression significantly affects RFS. YAP-1 and extrathyroidal extension were significant independent prognosticators for RFS.

Conclusions:

YAP-1 expression was significantly correlated with high-risk clinicopathologic features and inferior RFS in patients with PTC.

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