Biomarkers of Parathyroid Carcinoma (original) (raw)
Abstract
The diagnosis of parathyroid carcinoma can be challenging, and adjuvant therapies such as radiotherapy and chemotherapy are not particularly beneficial in the management of this disease, creating a challenge when dealing with unresectable recurrent and metastatic malignancy. We investigated the expression profile of biomarkers that represent potential markers of malignancy or targets for novel therapies in this disease. We constructed a tissue microarray of parathyroid carcinomas from 10 patients as well as parathyroid adenomas from 25 patients and stained the slides for 34 proteins involved in angiogenesis (platelet-derived growth factor receptor (PDGFR)-α, PDGFR-β, vascular endothelial growth factor receptor-2 (VEGFR-2), and epidermal growth factor receptor (EGFR)), inflammation (cyclooxygenase (COX)-1 and COX-2), cell adhesion (matrix metalloproteinase (MMP)-1, CD9, and keratin 7), cell cycle (Cdc2p34, cyclin D1, retinoblastoma (Rb), p27, p21, parafibromin, Bmi-1, 14-3-3σ, and p53), and apoptosis (Bcl-2a, Mcl-1, Bcl-xL, and glutathione-_S_-transferase-isoenzyme π (Gst-π)) along with some markers of the sonic hedgehog (Smo, SHH, Gli-1, Gli-2, Gli-3, and patched), mTOR (AKT, mammalian target of rapamycin (mTOR), and Forkhead box O (FoxO)-1), and WNT (Wisp-1, Wisp-2, and β-catenin) signal transduction pathways. Protein expression was determined using computerized image analysis software (Spectrum Plus©, Aperio). Bcl-2a, parafibromin, Rb, and p27 were significantly decreased to variable degrees in all parathyroid carcinomas. COX-1/2, CD9, MMP-1, FoxO-1, VEGFR-2, PDGFR-α/β, Gst-π, Gli-1, Gli-2, Gli-3, and patched were expressed in the majority of benign and malignant tumor cells. These results indicate that the use of a panel that includes Bcl-2a, parafibromin, Rb, and p27 may be helpful in the assessment of atypical parathyroid neoplasms. Although the majority of other markers studied are also expressed in both benign and malignant parathyroid neoplasms, we have identified several potentially important target proteins related to angiogenesis and cell proliferation along with COX-1/2, Gst-π and members of sonic hedgehog pathway that may be therapeutic targets in parathyroid carcinoma. While these results are preliminary, a successful outcome of a clinical trial directed against these novel targets would provide much needed systemic adjuvant treatment for patients with metastatic parathyroid carcinoma.
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Acknowledgments
The preliminary results of this paper were presented in part at the 101st United States and Canadian Academy of Pathology Annual Meeting, 17–23 March 2012, Vancouver, BC, Canada.
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Authors and Affiliations
- Department of Otolaryngology-Head and Neck Surgery/Surgical Oncology, Wharton Head and Neck Program, Toronto, Ontario, Canada
Boban M. Erovic, Luke Harris, David P. Goldstein & Jonathan C. Irish - Department of Pathology, University Health Network, Toronto, Ontario, Canada
Mina Jamali, Sylvia L. Asa & Ozgur Mete - Department of Pathology, University Health Network, 200 Elizabeth Street, 11th Floor, Toronto, ON, M5G 2C4, Canada
Ozgur Mete
Authors
- Boban M. Erovic
- Luke Harris
- Mina Jamali
- David P. Goldstein
- Jonathan C. Irish
- Sylvia L. Asa
- Ozgur Mete
Corresponding author
Correspondence toOzgur Mete.
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Erovic, B.M., Harris, L., Jamali, M. et al. Biomarkers of Parathyroid Carcinoma.Endocr Pathol 23, 221–231 (2012). https://doi.org/10.1007/s12022-012-9222-y
- Published: 22 September 2012
- Issue date: December 2012
- DOI: https://doi.org/10.1007/s12022-012-9222-y