Clinical Trial: PET-MRI After Radiofrequency Ablation (RFA) or Microwave Ablation (MWA)

Study Status: Completed
Recruit Status: Completed
Study Type: Observational

Official Title: The Use of PET-MRI in the Follow-up of RFA and MWA Treated Colorectal Liver Metastases

Brief Summary:

The primary objective of this study is to evaluate the ability of PET-MRI and to detect a local site recurrence during the first year of follow-up after RFA or MWA of colorectal liver metastases (CRLM) as compared with contrast enhanced (ce) CT and PET-CT. Standard reference will be clear focal uptake in the rim of the lesion on PET-CT, possibly in combination with histology (when available) or clinical follow-up.

Secondary outcomes are the inter-observer variability, the ability to diagnose new intrahepatic lesions and in what way PET-MRI is able to influence future treatment compared to PET-CT and ceCT. The patients satisfaction concerning the PET-MRI will be examined with a questionnaire.


Detailed Summary:

All included patients will routinely undergo follow-up with 3 monthly ceCT of the liver and PET-CT in the first year after RFA/MWA of CRLM according to standard of care in our hospital. Patients are asked to undergo an additional PET-MRI of the liver on the same day in the first year (in total 4 scans). The PET-MRI is obtained before the PET-CT. The 18F-2-fluoro-2-deoxy-D-glucose fluorodeoxyglucose (FDG) used for PET-CT and PET-MRI are alike and one injection is sufficient. The PET-CT has to be made within 150 minutes after FDG injection. Anonymous PET-MRI results are independently reviewed by 2 experienced radiologists and 2 nuclear medicine physicians twice, with a time-interval of at least two weeks between the first and second review. Based on these results, treatment decisions will be compared for any change in decision making.

The evaluate inter-observer variability we will ask the two nuclear medicine physicians and two radiologist to assess all results and score local and intrahepatic tumor progression. Results of the first and second evaluation will be compared to determine inter observer agreement using Cohen's Kappa. Local recurrence and new lesions will be scored on a separate form with standard criteria.

The reports on LSR will be scored as follows:

  • Normal: when the reviewer is sure that no tumor recurrence is present in the ablation zone.
  • Probably benign: FDG is enhanced, but compatible with post-ablation inflammation or rim-like characteristics on MRI images (not focal!)
  • Equivocal: there is doubt whether the enhanced FDG, CT- or MRI features are due to tumor recurrence or inflammation
  • Probably malign: when the reviewer is su
    Sponsor: dr. M.P. van den Tol MD PhD

    Current Primary Outcome: Local site recurrence (LSR) detection [ Time Frame: 1 year ]

    The primary objective of this study is to evaluate the ability of PET-MRI and diffusion and contrast enhanced MRI to detect LSR during the first year of follow-up after RFA treatment of CRLM as compared with ceCT and PET-CT. Standard reference will be clear focal uptake in the rim of the lesion on PET-CT, possibly in combination with histology (when available) or clinical follow-up.


    Original Primary Outcome: Same as current

    Current Secondary Outcome:

    • Detection new intrahepatic lesions [ Time Frame: 1 year ]
      the ability of PET-MRI to diagnose smaller new intrahepatic lesions than PET-CT and ceCT
    • inter-observer variability [ Time Frame: 1 year ]
      Hard copy data sets of all PET-MRI and PET-CT scans, with no patient information, random order, independently reviewed by 2 experienced radiologists and 2 nuclear medicine physicians twice (reviewers blinded to the images and results of the other imaging modalities and blinded to the final outcome of patients), with a time-interval of at least two weeks between the first and second review. These scans are scored on a standardized form (explained in the section 'detailed description'). The outcomes between the different reviewers of the same scan are noted and compared to each other. Inter observer variability is determined using Cohen's Kappa.
    • Influence on decision making [ Time Frame: 1 year ]
      in what way PET-MRI is able to change future treatment compared to PET-CT and ceCT
    • Patients experience with PET-CT and PET-MRI [ Time Frame: end of one year follow-up ]

      A questionnaire with 7 questions is completed at the end of one year follow-up to determine patients experience with PET-MRI and PET-CT. This is done to get an idea of the possible objections and wishes of all patients. Results will be described.

      The questions will be in Dutch, but are translated below for this purpose. Patients can answer on a scale 1-5 and n/a.

      • The PET-MRI was less burdensome than PET-CT
      • The PET-MRI was more bothersome than I expected
      • PET-MRI is more comfortable than PET-CT
      • If I could choose, I would rather undergo PET-MRI than PET-CT
      • The noise of the PET-MRI was annoying
      • The fact that PET-MRI takes longer than PET-CT isn't an issue for me
      • I would rather undergo a PET-MRI than a PET-CT if results are proven to be equal


    Original Secondary Outcome: Same as current

    Information By: VU University Medical Center

    Dates:
    Date Received: June 20, 2013
    Date Started: June 2013
    Date Completion:
    Last Updated: December 14, 2016
    Last Verified: December 2016