High level βIII-tubulin overexpression occurs in most head and neck cancers but is unrelated to clinical outcome

Background βIII-tubulin (TUBB3) is an isotype of microtubules, which are involved in crucial cellular roles including maintenance of cell shape, intracellular transport, and mitosis. Overexpression of TUBB3 was found to be associated with poor prognosis and resistance to tubulin-binding drugs and in several solid tumors including head and neck squamous cell carcinomas (HNSCC). Considering the potential high importance of a prognostic biomarker in these cancers, the present study aimed to investigate the clinical relevance of immunohistochemical TUBB3 expression in HNSCC. Methods Tissue microarray (TMA) sections containing samples from 667 cancers of oral cavity, oro- and hypopharynx and larynx for which follow-up data were available were analyzed for TUBB3 expression by immunohistochemistry. Results Over 90% of our analyzed cancers showed unequivocal cytoplasmic TUBB3 expression. Staining was considered weak in 69 (15.5%), moderate in 149 (33.5%) and strong in 188 (42.2%) of cancers. The frequent TUBB3 overexpression showed no significant correlation with pathological grading, tumor stage, nodal status or surgical margin and had no impact on patient outcomes. Conclusion Despite of lacking prognostic utility in HNSCC, the remarkable high prevalence of TUBB3 expression in HNSCC emphasizes its putative relevance as a target for future drugs targeting TUBB3. This article is protected by copyright. All rights reserved.