N-stage, dichotomized between N2a and N2b, as used in Ang’s risk classification, was statistically significant in OS ( p = 0.010) and nearly significant in PFS and DSS with p -values of 0.072 and 0.051, respectively ( Table 2 ).
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Non-Robustness of Ang's Risk Classification in Human Papillomavirus-Related Oropharyngeal Squamous Cell Carcinoma in Japanese Patients.
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