Stage grouping Anatomical site Number of tumours (%)
I Oral cavity 34 (3.93)
Larynx 23 (2.66)
Other 5 (0.58)
II Oral cavity 24 (2.81)
Larynx 13 (1.52)
Oropharynx 8 (0.94)
Other 8 (0.94)
III Larynx 33 (3.86)
Oral cavity 20 (2.34)
Oropharynx 18 (2.10)
Nasopharynx 8 (0.94)
Other 13 (1.52)
IVA Oral cavity 207 (24.24)
Oropharynx 97 (11.36)
Larynx 93 (10.89)
Hypopharynx 27 (3.16)
Salivary gland 14 (1.64)
Sinuses 14 (1.64)
Other 22 (2.58)
IVB Oropharynx 28 (3.28)
Oral cavity 25 (2.92)
Hypopharynx 16 (1.87)
Larynx 11 (1.29)
Sinuses 10 (1.17)
Other 22 (2.58)
IVC Larynx 14 (1.64)
Oropharynx 11 (1.29)
Unknown primary 8 (0.94)
Hypopharynx 6 (0.70)
Oral cavity 5 (0.58)
Other 9 (1.05)
IV Sinuses 3 (0.35)
Base of tongue 1 (0.12)
Other 3 (0.35)
Unstaged Oral cavity 5 (0.58)
Oropharynx 3 (0.35)
Other 4 (0.47)