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Table 2 Location of metastases and characteristics within the entire cohort of NPC patients

From: Subdivision of M category for nasopharyngeal carcinoma with synchronous metastasis: time to expand the M categorization system

Location and type of metastases Number of patients (cases [%])a Percentage (%)b
Bone
 Isolated bone metastasis 184 (65.9)  
 Total bone metastases 333 (100.0) 65.9
 Number of lesions
  Single metastasis 74 (22.2)  
  Multiple metastases 239 (71.8)  
  Not specified 20 (6.0)  
Lung
 Isolated lung metastasis 56 (41.2)  
 Total lung metastases 136 (100.0) 26.9
 Number of lesions
  Single metastasis 42 (30.9)  
  Multiple metastases 89 (65.4)  
  Not specified 5 (3.7)  
Liver
 Isolated liver metastasis 56 (36.1)  
 Total liver metastases 155 (100.0) 30.7
 Number of lesions   
  Single metastasis 43 (27.7)  
  Multiple metastases 102 (65.8)  
  Not specified 10 (6.5)  
Distant lymph nodes
 Isolated lymph node metastases 10 (6.9)  
 Total lymph node metastases 144 (100.0) 28.5
 Number of lesions   
  Single metastasis 15 (10.4)  
  Multiple metastases 112 (77.8)  
  Not specified 17 (11.8)  
Othersc
 Isolated metastasis 0 (0.0)  
 Total number of other metastases 12 (100.0) 2.4
 Number of lesions
  Single metastasis 4 (33.3)  
  Multiple metastases 2 (16.7)  
  Not specified 6 (50)  
  1. aThe percentages of patients with respect to the total of patients with metastasis at the corresponding locations.
  2. bThe percentage of patients with respect to the total of patients with synchronous metastatic NPC.
  3. cOthers include the spleen, kidney, pleura, breast gland, abdominal wall, and thyroid gland.