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01 April 2012

Receptor-Binding Cancer Antigen expressed on SiSo cells (RCAS1) expression in human benign and malignant thyroid lesions

Constantinos GiaginisACDE, Nikoleta DemetriouBF, Paraskevi AlexandrouBD, Vasileios StolakisCF, Ioanna DelladetsimaB, Jerzy KlijanienkoD, Ioannis GriniatsosD, Stamatios TheocharisADEG

DOI: 10.12659/MSM.882613

Med Sci Monit 2012; 18(4): BR123-129


Background: The receptor-binding cancer antigen expressed on SiSo cells (RCAS1) is a human tumor-associated antigen that contributes to tumor progression by enabling cancer cells to evade immune surveillance. The present study aimed to evaluate the clinical significance of RCAS1 expression in human benign and malignant thyroid lesions.
Material/Methods: RCAS1 protein expression was assessed immunohistochemically on paraffin-embedded thyroid tissues from 121 patients with benign and malignant lesions and was associated with type of thyroid histopathology and tumor stage parameters such as tumor size, lymph node metastases, capsular, lymphatic and vascular invasion.
Results: RCAS1 positivity, overexpression and staining intensity provided a distinct discrimination between benign and malignant thyroid cases (p=0.0006, p=0.0001 and p=0.0001, respectively), as well as between hyperplastic nodule and papillary carcinoma cases (p=0.0229, p=0.0001 and p=0.0001, respectively). RCAS1 positivity, overexpression and staining intensity also provided distinct discrimination between cases with Hashimoto thyroiditis and those with hyperplastic nodule (p=0.0221, p=0.0001 and p=0.0019, respectively). In the subgroup of malignant thyroid lesions, RCAS1 overexpression was significantly associated with large tumor size (p=0.0246), the presence of lymph node metastases (p=0.0351) and capsular invasion (p=0.0397).
Conclusions: RCAS1 protein may participate in thyroid neoplastic transformation and could be considered as a useful biomarker to improve diagnostic scrutiny.

Keywords: Staining and Labeling, Thyroid Neoplasms - pathology, Antigens, Neoplasm - metabolism

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750