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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Head Neck. 2014 Jan 20;36(9):1233–1240. doi: 10.1002/hed.23438

Figure 2. Overall Survival Curves of the Entire Cohort Stratified by the American Joint Committee on Cancer Oropharyngeal Staging System, Nasopharyngeal (NasoN) Staging System, and the HPV N Positive (HPV+N) Staging System.

Figure 2

Figure 2a shows the OS of the entire cohort stratified by the AJCC staging system. There were no significant differences in OS when comparing patients with N1 and N2 (p=0.063) as well as N2 and N3 nodal disease (p=0.12). Figure 2b shows the OS of the entire cohort stratified by the NasoN staging system. There was no significant difference in OS when comparing NasoN2 and NasoN3 nodal disease (p=0.61). Figure 2c shows the OS of the entire cohort stratified by the HPV+N staging system. There were significant differences in OS when comparing patients with HPV+N1 and HPV+N2 (p=0.03) as well as HPV+N2 and HPV+N3 nodal disease (p=0.0001).