The Impact of ¹⁸F-FDG PET CT Prior to Chemoradiotherapy for Stage III/IV Head and Neck Squamous Cell Carcinoma

Table 3

Summary of TNM alterations following PET-CT.

Effect of PET-CT on TNM	No. of patients
Upstaging	11 (20%)
N0 to N1; N0 to N2b; N0 to N2c; N1 to N2c; N2a to N2b; N2b to N2c; M0 to M1	1; 1; 2; 1; 1; 4; 1
Downstaging	6 (11%)
N1 to N0; N2c to N2a; N2c to N2b	1; 1; 4
No impact	38 (69%)