In multivariate analysis, pT4a category was associated with lower OS ( p = 0.032) in TNM7, whereas pT3 failed to reach statistical significance ( p = 0.051); however, only one patient was classified as pT3, thus limiting the validity of comparison. pT3 and pT4a categories were associated with poorer OS in TNM8 and revisions, and when combining the pN-N+ metrics.
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Comparison of Different Staging Systems Applied to a Cohort of Patients With Oral Tongue and Floor of the Mouth Cancer.
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pT4a categories did not reach statistical significance ( Figure 4 ).