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Table 1 Clinical N category classification of patients in this study based on the Union for International Cancer Control TNM staging system

From: Prevalence and risk factors for retropharyngeal and retro-styloid lymph node metastasis in hypopharyngeal carcinoma

UICC edition

n

N category (%)

N0

N1

N2a

N2b

N2c

N3

N3a

N3b

7th

77

32 (42)

8 (10)

1 (1)

23 (30)

12 (16)

1 (1)

NA

NA

8th

78

22 (28)

4 (5)

0 (0)

29 (37)

9 (12)

NA

0 (0)

14 (18)

  1. UICC: Union for International Cancer Control; NA: not applicable
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Radiation Oncology

ISSN: 1748-717X

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