Abstract
Background
Human papillomavirus (HPV) is the major predictor of outcome in oropharyngeal squamous cell carcinoma (OSCC) but the disease is heterogeneous and there is limited understanding of the prognostic significance of other molecular markers in relation to HPV. This multi-institutional, retrospective study examined the prognostic significance of Ki67 expression in association with HPV status in OSCC.
Methods
The 105 patients recruited had a median follow-up of 70 months. Tumor HPV status was determined by HPV E6-targeted multiplex real-time polymerase chain reaction/p16 semiquantitative immunohistochemistry and Ki67 expression by semiquantitative immunohistochemistry. Determinants of recurrence and mortality hazards were modelled using Cox regression with censoring at dates of last follow-up.
Results
HPV and Ki67 positivity rates were 46 and 44 %, respectively. HPV-positive cancers were more likely to be Ki67-positive. On multivariate analysis, both HPV and Ki67 were predictors of outcome. Ki67-positive cancers were associated with a 3.13-fold increased risk of disease-related death compared with Ki67-negative cancers. Among HPV-negative patients, Ki67-positive disease was associated with 5.6-fold increased risk of oropharyngeal cancer-related death (p = 0.002), 5.5-fold increased risk of death from any cause (p = 0.001), and 2.9-fold increased risk of any event (p = 0.013). The risk of locoregional failure was lowest in patients with HPV-positive/Ki67-positive cancers.
Conclusions
Ki67 predicts disease-related death in oropharyngeal cancer independent of HPV status. A combination of Ki67 and HPV status provides improved prognostic information relative to HPV status alone. Our data suggest, for the first time, that Ki67 status has prognostic value, particularly in HPV-negative oropharyngeal cancer.
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ACKNOWLEDGMENT
The authors gratefully acknowledge the financial support of the Sydney Head and Neck Cancer Institute, Cure Cancer Australia, and Cancer Australia. We would also like to thank the clinicians at all the participating hospitals.
DISCLOSURE
The authors have no conflicts of interest to disclose.
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10434_2014_4237_MOESM1_ESM.tif
Supplementary material 1 (TIFF 2701 kb) Representative images of immunohistochemical expression of Ki67 fromhigh-expressing (Left; Ki67-positive) and low-expressing (Right; Ki67-negative) OSCC. Immunohistochemical staining shows positive cells in brown colour,counterstained with Harris’ hematoxylin
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Liu, J., Zhang, M., Rose, B. et al. Ki67 Expression has Prognostic Significance in Relation to Human Papillomavirus Status in Oropharyngeal Squamous Cell Carcinoma. Ann Surg Oncol 22, 1893–1900 (2015). https://doi.org/10.1245/s10434-014-4237-x
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DOI: https://doi.org/10.1245/s10434-014-4237-x