Quantitative Metastatic Lymph Node Regions on Magnetic Resonance Imaging Are Superior to AJCC N Classification for the Prognosis of Nasopharyngeal Carcinoma

Table 1

Patient characteristics.

Characteristics	No. of patients (%)
Age, median (range), y	49 (12-81)
Gender
Male	266 (75.1)
Female	88 (24.9)
Histological type
WHO I	1 (0.3)
WHO II	353 (99.7)
T classification (AJCC /)
T1	119 (33.6)/119 (33.6)
T2	52 (14.7)/64 (18.1)
T3	47 (13.3)/88 (24.9)
T4	136 (38.4)/83 (23.4)
N classification (AJCC /)
N0	34 (9.6)/34 (9.6)
N1	149 (42.1)/143 (40.4)
N2	114 (32.2)/87 (24.6)
N3	57 (16.1)/90 (25.4)
Clinical stage (AJCC /)
I-II	100 (28.3)/102 (28.8)
III-IV	254 (71.7)/259 (71.2)
Treatment modality
RT alone	54 (15.2)
IC+RT	37 (10.4)
CCRT	49 (13.8)
IC+CCRT	138 (38.9)
CCRT+AC	14 (3.9)
IC+RT+AC	62 (17.5)
Cumulative cisplatin dose
≤ 300mg/m^2	301 (84.8)
> 300mg/m^2	53 (14.9)

Abbreviations: AJCC: American Joint Committee on Cancer; RT: radiation therapy; IC: induction chemotherapy; CCRT: concurrent chemoradiotherapy; AC: adjuvant chemotherapy.