Table 4: Distribution of lymph node involvement (N) according to the primary tumor site.
|
N |
Site |
No |
% |
|
N0 |
Oral Cavity |
70 |
42.4 |
|
|
Larynx |
75 |
49.7 |
|
|
Oropharynx |
6 |
15 |
|
|
Hypopharynx |
5 |
11.9 |
|
|
Nasopharynx |
3 |
30 |
|
|
Unknown 1ry site |
1 |
1.6 |
|
N1 |
Oral Cavity |
60 |
36.4 |
|
|
Larynx |
40 |
26.5 |
|
|
Oropharynx |
6 |
15 |
|
|
Hypopharynx |
5 |
11.9 |
|
|
Nasopharynx |
2 |
20 |
|
|
Unknown 1ry site |
30 |
48.4 |
|
N2 |
Oral Cavity |
30 |
18.2 |
|
|
Larynx |
30 |
19.9 |
|
|
Oropharynx |
20 |
50 |
|
|
Hypopharynx |
20 |
47.6 |
|
|
Nasopharynx |
4 |
40 |
|
|
Unknown 1ry site |
25 |
40.3 |
|
N3 |
Oral Cavity |
5 |
3 |
|
|
Larynx |
6 |
4 |
|
|
Oropharynx |
8 |
20 |
|
|
Hypopharynx |
12 |
28.6 |
|
|
Nasopharynx |
1 |
10 |
|
|
Unknown 1ry site |
5 |
8 |
|
Nx |
Unknown 1ry site |
1 |
1.6 |