Study	No. of participants + stages	Timing of interim PET scan	Unadjusted results for interim PET scan
Casasnovas 2019	Standard arm N = 413	PET2	PET2 results (N = 398) Intention‐to‐treat analysis 5‐year OS for entire arm = 95·2% (95% CI 91·1 to 97·4), 13 events Per‐procotol analysis N = 372 participants 5‐year OS for entire arm = 95.6% (95% CI 91.2 to 97.8), 10 events Comment: Separate results for PET2‐negative and PET2‐positive participants in the standard arm were not reported for this outcome.
Gallamini 2014	260 (stages IIA ‐ IVB)	PET2	PET‐negative N = 215, 2 deaths, 3‐year OS = 99% PET‐positive N = 45, 6 deaths, 3‐year OS = 87% Comment: Logrank test for difference between groups was not reported and could not be obtained.
Hutchings 2006	77 (all stages)	PET2 and PET4	PET2 results (N = 77) PET‐negative N = 61, no deaths PET‐positive N = 16, 2 deaths Logrank test for difference between groups: P < .01 PET4 results (N = 64) PET‐negative N = 51, no deaths PET‐positive N = 13, 2 deaths Comment: Logrank test for difference between groups after PET4 was not reported and could not be obtained.