Abstract
Objective
Myeloma Response Assessment and Diagnosis System recently published provides a framework for the standardised interpretation of DW-WBMRI in response assessment of multiple myeloma (MM) based on expert opinion. However, there is a lack of meta-analysis providing higher-level evidence to support the recommendations. In addition, some disagreement exists in the literature regarding the effect of timing and lesion subtypes on apparent diffusion coefficient (ADC) value changes post-treatment.
Method
Medline, Cochrane and Embase were searched from inception to 20th July 2021, using terms reflecting multiple myeloma and DW-WBMRI. Using PRISMA reporting guidelines, data were extracted by two investigators. Quality was assessed by the Quality Assessment of Diagnostic Accuracy Studies-2 method.
Results
Of the 74 papers screened, 10 studies were included comprising 259 patients (127 males and 102 females) and 1744 reported lesions. Responders showed a significant absolute ADC change of 0.21×10−3 mm/s2 (95% CI, 0.01–0.41) with little evidence of heterogeneity (Cochran Q, p = 0.12, I2 = 45%) or publication bias (p = 0.737). Non-responders did not show a significant absolute difference in ADC (0.06 ×10−3 mm/s2, 95% CI, −0.07 to 0.19). A percentage ADC increase of 34.78% (95% CI, 10.75–58.81) was observed in responders. Meta-regression showed an inverse trend between ADC increases and time since chemotherapy initiation which did not reach statistical significance (R2 = 20.46, p = 0.282).
Conclusions
This meta-analysis supports the use of the DW-WBMRI as an imaging biomarker for response assessment. More evidence is needed to further characterise ADC changes by lesion subtypes over time.
Key Points
• In multiple myeloma patients who received chemotherapy, responders have a significant absolute increase in ADC values that is not seen in non-responders.
• A 35% increase in ADC from baseline values is found to classify response post-induction chemotherapy which corroborates with expert opinion from the Myeloma Response Assessment and Diagnosis System.
• More evidence is needed to further characterise ADC changes by lesion subtypes over time after induction of therapy.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- DW-WBMRI:
-
Diffusion-weighted whole-body magnetic resonance imaging
- IMWG:
-
International Myeloma Working Group
- MET-RADS:
-
Metastasis Reporting and Data System for Prostate Cancer
- MM:
-
Multiple myeloma
- MY-RADS:
-
Myeloma Response Assessment and Diagnosis System
- NICE:
-
National Institute for Health and Care Excellence
- PRISMA:
-
Preferred Reporting Items for Systematic Reviews and Meta-Analyses
- QUADAS:
-
Quality Assessment of Diagnostic Accuracy Studies
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Wang, K., Lee, E., Kenis, S. et al. Application of diffusion-weighted whole-body MRI for response monitoring in multiple myeloma after chemotherapy: a systematic review and meta-analysis. Eur Radiol 32, 2135–2148 (2022). https://doi.org/10.1007/s00330-021-08311-z
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DOI: https://doi.org/10.1007/s00330-021-08311-z