Characteristics Number
HNSCC patients sex and age
 Male 16
 Female 3
 Mean age (years) 60
 Age range (years) 41-84
Sample site
Primary tumour 4
Tumour associated lymph node 15
Tumour stage
 Early (T1 and T2) 4
 Advanced (T3 and T4) 12
 Unknown 3
Primary tumour site
 Laryngeal 9
 Oropharyngeal 6
 Hypopharyngeal 2
 Unknown 2
Table 1: Clinicopathological features of HNSCC patients whose tumour samples were assessed for Treg frequency and function.