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Effect of reconstruction settings and therapy on 18F-FDG PET/CT blood pool and liver SUV in patients with diffuse large B-cell lymphoma

  • T. V
  • C. B
  • O. H
  • et al.
ISSN: 2159-662X
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Abstract

Objectives: The PET Re-Analysis (PETRA) project is an international consortium building a shared database consisting of individual patient data and 8F-FDG PET/CT scans. PETRA aims to re-analyze interim PET/CT scans in diffuse large B-cell lymphoma (DLBCL) to validate interim PET/CTas a biomarker of response in first-line therapy. The EANM guidelines for tumor imaging 2.0 suggest that liver and blood pool standardized uptake values (SUVs) may be used for quality control to verify e.g. correct FDG administration or technically correct scanner performance. Moreover, the ICML response criteria compare tumor uptake to liver and blood pool uptake. For validation of interim PET/CT as an imaging biomarker, the quality control of PET/CT scans is essential to assure harmonized quality of pooled PETRA data. To this end, we investigated whether reconstruction settings, therapy and use of growth factors influenced liver and blood pool SUVs in DLBCL patients. Methods: PET/CT scans of DLBCL patients were collected from the HOVON 84 study, a multicenter randomized controlled trial. Patients were treated with R-CHOP14 therapy and were randomized to receive rituximab intensification in the first four cycles or not. Granulocyte-colony stimulating factor (G-CSF) was given to oppose neutropenic side effects. Therapy was not adapted based on interim PET/CT results. Liver and mediastinal blood pool (MBP) uptakes were analyzed in 123 baseline PET/CT scans to determine the effect of reconstruction settings. Based on the EANM Research Ltd (EARL) criteria, we created 3 groups? EARL compliant, non-EARL compliant and unknown. Liver and MBP SUVs were analyzed at baseline, interim (after 4 cycles of chemotherapy) and end-of treatment for 34 DLBCL patients to determine the influence of therapy. Interim scan timing was defined as time between the start of the fourth R-CHOP14 cycle and interim PET/CT. Differences in SUV variance between reconstruction settings were analyzed using Levene's test. Baseline, interim and end-of-treatment SUVs were compared using paired samples t-test (p < 0.05 was considered to be significant). Correlation between SUV and interim scan timing was analyzed using linear regression. Results: No significant differences in variances between the various SUVs were seen in EARL compliant baseline scans compared to unknown or non-EARL compliant scans. As is shown in Figure 1, a significant increase was seen in liver SUVmean (+0.414 p = <0.001), liver SUVmax (+0.604; p = <0.001) and MBP SUVmean (+0.172; p = 0.026) in the interim PET/CT compared to the baseline PET/CT. Also a significant increase was seen in liver SUVmean (+0.393; p = 0.001), liver SUVmax (+0.388; p = 0.005) and MBP SUVmean (+0.215; p = 0.021) in the end-of-treatment PET/CT compared to the baseline PET/CT. Liver SUVmax (+0.229; p = 0.031) was increased in interim PET/CT compared to end-of-treatment PET/CT. No correlation was found between SUV and interim scan timing. Conclusion: Reconstruction settings did not affect SUV in reference organs used for quality control in DLBCL. This is in line with Kuhnert et al (EJNMMI 2016), who showed that non-EARL compliant reconstructions have a large effect on SUV in tumors, but almost not in liver and blood pool. We did not study the effect of reconstruction settings on tumors. Moreover, DLBCL therapy seems to affect liver and MBP SUV, suggesting an altered biodistribution of FDG. Therefore, use of liver and MBP SUV as quality control index on PET/CT scans could result in discarding technically correct PET/CT scans because of increased SUV.

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T., V. D. B., C., B., O., H., J., Z., H., D. V., & R., B. (2017). Effect of reconstruction settings and therapy on 18F-FDG PET/CT blood pool and liver SUV in patients with diffuse large B-cell lymphoma. Journal of Nuclear Medicine, 58. Retrieved from http://www.embase.com/search/results?subaction=viewrecord&from=export&id=L617552974

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