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Table 1 Baseline characteristics of 4469 NPC patients at primary diagnosis

From: Selectively recommend 18F-FDG PET/CT for patients with de novo nasopharyngeal carcinoma in endemic areas

Characteristic Total
N = 4469 (%)
PET/CT group
N = 1171 (%)
CWU group
N = 3298 (%)
Gender    
 Male 3269 (73.15) 871 (74.38) 2398 (72.71)
 Female 1200 (26.85) 300 (25.62) 900 (27.29)
Age    
  ≥ 50 2122 (47.48) 535 (45.69) 1587 (48.12)
  < 50 2347 (52.52) 636 (54.31) 1711 (51.88)
T stage    
 T1 820 (18.35) 227 (19.39) 593 (17.98)
 T2 793 (17.74) 212 (18.10) 581 (17.62)
 T3 1627 (36.41) 468 (39.97) 1159 (35.14)
 T4 1229 (27.50) 264 (22.54) 965 (29.26)
N stage    
 N0 375 (8.39) 95 (8.11) 280 (8.49)
 N1 1593 (35.65) 351 (29.97) 1242 (37.66)
 N2 1569 (35.11) 425 (36.29) 1144 (34.69)
 N3 932 (20.85) 300 (25.62) 632 (19.16)
M stage    
 M0 4225 (94.54) 1084 (92.57) 3141 (95.24)
 M1 244 (5.46) 87 (7.43) 157 (4.76)
Plasma EBV DNA    
 Low* 3553 (79.50) 859 (73.36) 2694 (81.69)
 High** 916 (20.50) 312 (26.64) 604 (18.31)
  1. EBV, Epstein-Barr virus
  2. *Low EBV DNA level of < 14,650 copies/ml
  3. **High EBV DNA level of ≥ 14,650 copies/ml