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Toll-like receptor 5 and 7 expression in adenoid cystic carcinoma of major salivary glands

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Tumor Biology

Abstract

Adenoid cystic carcinoma (ACC) of the salivary glands has a poor long-term prognosis and high metastatic rate. Toll-like receptors (TLRs) have been related to tumour progression but have also tumour growth-inhibiting responses. To the best of our knowledge, they have not been studied previously in ACC. We studied the immunoexpression of TLR 5 and 7 in ACC of the major salivary glands. From a cohort of 54 patients with ACC of the major salivary glands treated at the Department of Otorhinolaryngology-Head and Neck Surgery, Helsinki University Hospital, Helsinki, Finland in 1974–2009, there were 34 primary tumours and six metastases available for immunohistochemical analysis. Immunohistochemical expression of TLR 5 and 7 were correlated to clinicopathological findings and patient survival. Both TLR 5 and 7 were expressed in ACCs and their metastases, mostly on the cell membranes. The expression was heterogeneous in individual tumours. TLR 5 was expressed less in male samples, and TLR 7 had lower expression in ACCs with solid growth pattern. No correlation with survival was found. In the normal salivary gland, the TLR 5 and 7 expression was mainly negative. Both TLR 5 and 7 are expressed in salivary adenoid cystic carcinoma on the cell membranes as well as in cytoplasm.

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Abbreviations

ACC:

Adenoid cystic carcinoma

TLR:

Toll-like receptor

OS:

Overall survival

DSS:

Disease-specific survival

DFS:

Disease-free survival

DAMP:

Danger-associated molecular pattern

PAMP:

Pathogen-associated molecular pattern

LPS:

Lipopolysaccharide

PRR:

Pattern-recognition receptor

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Correspondence to K. Hirvonen.

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Highlights

1. TLR 5 and 7 are shown to be expressed in salivary gland adenoid cystic carcinoma for the first time.

2. TLR 5 and 7 are expressed on cell membranes and in cytoplasm in ACC.

3. TLR 5 correlated with male gender and TLR 7 with solid growth pattern in ACC.

A. A. Mäkitie and J. Hagström contributed equally to this work.

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Hirvonen, K., Bäck, L., Haglund, C. et al. Toll-like receptor 5 and 7 expression in adenoid cystic carcinoma of major salivary glands. Tumor Biol. 37, 10959–10964 (2016). https://doi.org/10.1007/s13277-016-4971-8

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  • DOI: https://doi.org/10.1007/s13277-016-4971-8

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