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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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