49 IVS patients from 4 PET centers (Créteil n=15; Dijon n=14; Cuneo n=11; Rouen n=9)
PET/CT at baseline and 2 cycles Interpretation by 3 observers using the 5PS Transfers/readings on Positoscope workstations Inter-observer agreement (Kappa)
Quantification with ∆SUV (66% cut-off)
5-point scale weighted Kappa (Cohen)
Landis and Koch scale 66%) Event-free survival
n=36
n=36
# of events = 14 Median f-u = 25 mo
n=13
P = .003 χ2 = 8.97 n=36
Créteil : 2-y EFS : 81% vs. 46%
n=13
P = .002 χ2 = 9.42 Dijon : 2-y EFS : 81% vs. 45%
→ Better agreement between observers
n=13
P = .002 χ2 = 9.96 Cuneo : 2-y EFS : 81% vs. 45%
Conclusions
5PS: moderate to substantial agreement (κ 0.58-0.61) Ref. background must be high for interim PET/NHL Subjectivity → need for different opinions foci that were considered by Créteil/Dijon as “moderately increased above liver” (4) were considered “equal to liver” (3) by Cuneo
Quantification may help the definition of scores 3-4 ∆SUV is not observer-dependent for EFS prediction
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