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[123I]Ioflupane imaging in Caucasians and non-Caucasians: Are there any differences?

Published:October 03, 2018DOI:https://doi.org/10.1016/j.jns.2018.10.001

      Highlights

      • Nearly all of the subjects in the registration studies of DaTscan™ Ioflupane I123 Injection were Caucasian.
      • A retrospective case-control study evaluated if diagnostic performance of [123I]ioflupane SPECT differed in non-Caucasians.
      • Diagnostic performance of [123I]ioflupane was comparable between Caucasians and non-Caucasians in this multicenter study.

      Abstract

      Purpose of the report

      To compare diagnostic performance of [123I]ioflupane SPECT imaging in different racial groups. In previous registration trials of [123I]ioflupane, 99% of the subjects enrolled were Caucasians.

      Materials and methods

      A multicenter retrospective case-control study was conducted to evaluate whether the diagnostic performance of [123I]ioflupane SPECT imaging is different in non-Caucasians than in Caucasians matched by age, sex, and final clinical diagnosis. Subjects who had received an initial diagnosis of suspected Parkinson's disease (PD) or essential tremor (ET) and then underwent [123I]ioflupane SPECT imaging to assist with the subject's final clinical diagnosis were enrolled. Each subject's image was rated as normal or abnormal by 3 blinded expert readers. The majority interpretation was then compared with the final clinical diagnosis. Diagnostic performance of [123I]ioflupane SPECT imaging (as measured by positive percent agreement (equivalent to sensitivity), negative percent agreement (equivalent to specificity), overall percent agreement (OPA), and measures of inter-rater agreement) were compared between the Caucasian and non-Caucasian groups.

      Results

      In total, 102 non-Caucasians (58 with PD and 44 with ET as a final clinical diagnosis) and 102 Caucasians (58 with PD, 43 with ET, and 1 with “other”) were included in the intent-to-diagnose (ITD) population. There was no significant difference between Caucasians and non-Caucasians in the diagnostic performance of [123I]ioflupane SPECT imaging as measured by sensitivity, specificity, OPA, and measures of inter-rater agreement.

      Conclusion

      In this study, the diagnostic performance of [123I]ioflupane SPECT imaging was comparable between Caucasians and non-Caucasians.

      Abbreviations:

      PD (Parkinson's disease), DaT (dopamine transporters), ET (essential tremor), ITD (intent-to-diagnose), OPA (overall percent agreement), PP (per-protocol), SD (standard deviation), SPECT (single-photon emission computed tomography.)

      Keywords

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