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DWI and IVIM are predictors of Ki67 proliferation index: direct comparison of MRI images and pathological slices in a murine model of rhabdomyosarcoma

  • Yuan Yuan
  • Dewei Zeng
  • Yajie Liu
  • Juan Tao
  • Yu Zhang
  • Jie Yang
  • Tsendjav Lkhagvadorj
  • Zhenzhen Yin
  • Shaowu WangEmail author
Experimental
  • 36 Downloads

Abstract

Objectives

The purpose of this study was to investigate the correlation of diffusion-weighted imaging (DWI) and intravoxel incoherent motion (IVIM) with the Ki67 proliferation index in a murine model of rhabdomyosarcoma.

Methods

The rhabdomyosarcoma model was established by injecting RD cells into the right hind flank of nude mice. The mice underwent 3.0T magnetic resonance imaging (MRI), including DWI and IVIM. The apparent diffusion coefficient (ADC), D, D*, and f were calculated with the ADW4.7 workstation. A specialized method was employed to ensure the pathological sections corresponded to the correct MRI slices. The Ki67 proliferation index was analyzed by immunohistochemistry, and any possible correlations were assessed between the DWI and IVIM parameters and Ki67 proliferation index.

Results

Twenty-seven rhabdomyosarcoma mice were established successfully. After 46 days, the average tumor volume reached 1094.78 ± 678.77 mm3. The average ADC, D, and D* values were 1.0470 ± 0.2036 × 10−3 mm2/s, 0.7237 ± 0.0971 × 10−3 mm2/s, and 4.8497 ± 1.6293 × 10−3 mm2/s, respectively. The range in f values was 0.102–0.229. The ADC and D values showed a moderate negative correlation with the Ki67 proliferation indexes (r = − 0.543, p = 0.003; r = − 0.491, p = 0.009, respectively). In addition, the f value showed a weak negative correlation with the Ki67 proliferation indexes (r = − 0.151, p = 0.451), while the D* value showed no association with the Ki67 proliferation indexes (r = − 0.037, p = 0.853).

Conclusions

The ADC value of DWI, along with the D value of IVIM, may be reflective of Ki67 proliferation indexes in murine models of rhabdomyosarcoma.

Key Points

DWI and IVIM parameters are correlated with Ki67 proliferation indexes in rhabdomyosarcoma mouse models.

• A specialized method ensured a strong correlation between pathological sections and MRI slices, resulting in a robust radiological-pathological correlation.

Keywords

Rhabdomyosarcoma Diffusion magnetic resonance imaging Mice Ki-67 antigen 

Abbreviations

ADC

Apparent diffusion coefficient

DWI

Diffusion-weighted imaging

EPI

Echo planar imaging

FRFSE

Fast relaxation fast spin-echo

FSE

Fast spin-echo

H&E

Hematoxylin and eosin

IVIM

Intravoxel incoherent motion

MRI

Magnetic resonance imaging

ROI

Region of interest

T1WI

T1-weighted imaging

T2WI

T2-weighted imaging

Notes

Funding information

This study has received funding by the National Natural Science Foundation of China (81771804).

Compliance with ethical standards

Guarantor

The scientific guarantor of this publication is Shaowu Wang, MD, PhD.

Conflict of interest

The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.

Statistics and biometry

One of the authors has significant statistical expertise.

Informed consent

Approval from the institutional animal care committee was obtained.

Ethical approval

Institutional Review Board approval was obtained.

Methodology

• Prospective

• Experimental

• Performed at one institution

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Copyright information

© European Society of Radiology 2019

Authors and Affiliations

  1. 1.Department of RadiologyThe Second Hospital of Dalian Medical UniversityDalianChina
  2. 2.Department of PathologyThe Second Hospital of Dalian Medical UniversityDalianChina
  3. 3.School of Public HealthDalian Medical UniversityDalianChina
  4. 4.Dalian Medical UniversityDalianChina

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