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. 2014 Dec 23;9(12):e116261. doi: 10.1371/journal.pone.0116261

Figure 2. Survival analyses of the HRs of the T2a subset compared with other subsets using the TNM 6th edition staging system.

Figure 2

Panels A, B, and C were staged according to the TNM 6th edition staging system, while panels A′, B′, and C′ were plotted as estimated from the Cox multivariate model with adjustments for sex, age, histology, treatment modality, and radiotherapy techniques. In both statistical model, the hazard ratios (HRs) of T2a were similar to T1 in OS (Panels A and A′), LRRFS (Panels 2B and 2B′) and DMFS (Panels C and C′) but were significantly different from the T2b subset (parapharyngeal space invasion). HR: hazard ratio.