Abstract
Objectives
To evaluate the feasibility of using ultrasound-obtained tumor depth (TD) and margin shape (MS) to predict the prognosis of tongue cancer.
Methods
Fifty-two Japanese patients with tongue cancer who underwent ultrasound examination between 2007 and 2012 were retrospectively evaluated. TD was measured at the deepest portion of the tumor. MS was classified as “pressure,” “wedge-shaped,” or “permeated.” Prognosis was assessed by local recurrence, lymph node metastasis, and overall survival rate. We classified the patients into a good prognosis group and poor prognosis group. Relationships among TD, MS, and patient prognosis were evaluated using Spearman rank correlation. A regression formula to predict prognosis using TD and MS was derived.
Results
The correlation between TD and MS was significant (Spearman rank correlation ρ = 0.552, p < 0.01). Using a structure matrix, we identified the contribution of both predictors from an ultrasound image. The contribution of TD was 0.796, while that of MS was better at 0.906. The prognosis could be predicted using the following regression formula: \( D \, = \, - 2.801 \, + \, 0.093x \, + \, 0.872y \), where D prognosis (risk probability), x = TD (mm), and y = MS (grade). The average value for good risk probability was −0.254 (standard deviation, 0.962), while that for poor risk probability was 0.566 (standard deviation, 1.08) (p < 0.05). The cut-off value for classifying cases was −0.00169. Using the formula above, 73.1 % of patients in the poor prognosis group were correctly classified.
Conclusions
MS and TD are useful predictors of tongue cancer prognosis.
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Sitti Fadhillah Oemar Mattalitti, Toshiyuki Kawazu, Shintaro Kawano, Tatsuya Ikari, Hiroko Wada, and Kazunori Yoshiura declare that they have no conflict of interest.
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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. Informed consent was obtained from all patients for being included in the study.
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Mattalitti, S.F.O., Kawazu, T., Kawano, S. et al. Estimation of prognosis of tongue cancer using tumor depth and margin shape obtained from ultrasonography. Oral Radiol 33, 101–107 (2017). https://doi.org/10.1007/s11282-016-0251-y
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DOI: https://doi.org/10.1007/s11282-016-0251-y