The 3-year overall survival rates , disease-free-survival rates , locoregional relapse-free survival rates and distant metastasis-free survival rates in the NP and TP groups were 84.2 % and 82.9 % , 71.1 % and 74.3 % , 89.5 % and 91.4 % , 81.6 % and 77.1 % , respectively ( P > 0.05 ) .