Timing of scans to confirm iCPD

iRECIST recommends that imaging be repeated 4-8 weeks after iUPD was detected.

Scans were repeated 9 weeks after the iUPD was first detected, because of scheduling issues.  Can those scans not be used?

In order to ensure that patients do not have real and continuing disease progression that requires a change in management, it is recommended that scans be done within 4-8 weeks.  However, if the scan cannot be done within 8 weeks (scheduling, comorbid illness etc.) then the next scan (i.e., in this scenario, the scan done at 9 weeks) can be used to confirm iCPD.