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Prognostic value of PSMA, c-MET and E-cadherin in salivary duct carcinoma.

Authors :: van Boxtel W
Uijen MJM
Verhaegh GW
Willems SM
Jonker MA
Schalken JA
van Engen-van Grunsven ICH
van Herpen CML
Source :: Oral oncology [Oral Oncol] 2020 Nov; Vol. 110, pp. 105018. Date of Electronic Publication: 2020 Oct 08.
Publication Year :: 2020
Abstract: Objectives: Salivary duct carcinoma (SDC) is a rare and aggressive subtype of salivary gland cancer. Androgen receptor (AR) (96%) and HER2 (29-46%) expression, and a high propensity for regional lymph node metastases are hallmarks of the disease. We hypothesized that c-MET, E-cadherin, PSMA tumor and PSMA neovascular expression may be prognostic factors in SDC. Materials and Methods: Expression levels of these proteins were established on tissue microarrays containing 165 primary SDC tumor specimens. Association with survival was studied with Kaplan-Meier curves, and univariable and multivariable Cox regression models. Furthermore, association with lymph node status, AR and HER2 expression, and gender was studied. Results: We found that patients with high PSMA tumor expression showed a significantly longer overall survival (OS) (median 83 vs. 43 months, P = 0.022), a trend towards a longer DFS (median 51 vs. 22 months, P = 0.094), and significantly reduced hazard ratio for death in the univariable Cox regression model (HR 0.46, P = 0.034). In the multivariable model only a high number of tumor-positive lymph nodes and high age (>80) at diagnosis were prognostic for poor OS. High PSMA tumor expression was also significantly associated with low N-stage (P = 0.001) and expression was higher in women versus men (P = 0.029). High PSMA tumor expression and E-cadherin loss were significantly associated with strong and weak AR-expression, respectively (P = 0.033 and P = 0.007). None of the factors were significantly associated with HER2 expression. Conclusion: c-MET, E-cadherin, and tumor and neovascular PSMA expression are no independent prognostic factors in SDC. Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. (Copyright © 2020 The Authors. Published by Elsevier Ltd.. All rights reserved.)