Integrative radiomics expression predicts molecular subtypes of primary clear cell renal cell carcinoma

Clin Radiol. 2018 Sep;73(9):782-791. doi: 10.1016/j.crad.2018.04.009. Epub 2018 May 23.


Aim: To identify combined positron-emission tomography (PET)/magnetic resonance imaging (MRI)-based radiomics as a surrogate biomarker of intratumour disease risk for molecular subtype ccA and ccB in patients with primary clear cell renal cell carcinoma (ccRCC).

Materials and methods: PET/MRI data were analysed retrospectively from eight patients. One hundred and sixty-eight radiomics features for each tumour sampling based on the regionally sampled tumours with 23 specimens were extracted. Sparse partial least squares discriminant analysis (SPLS-DA) was applied to feature screening on high-throughput radiomics features and project the selected features to low-dimensional intrinsic latent components as radiomics signatures. In addition, multilevel omics datasets were leveraged to explore the complementing information and elevate the discriminative ability.

Results: The correct classification rate (CCR) for molecular subtype classification by SPLS-DA using only radiomics features was 86.96% with permutation test p=7×10-4. When multi-omics datasets including mRNA, microvascular density, and clinical parameters from each specimen were combined with radiomics features to refine the model of SPLS-DA, the best CCR was 95.65% with permutation test, p<10-4; however, even in the case of generating the classification based on transcription features, which is the reference standard, there is roughly 10% classification ambiguity. Thus, this classification level (86.96-95.65%) of the proposed method represents the discriminating level that is consistent with reality.

Conclusion: Featured with high accuracy, an integrated multi-omics model of PET/MRI-based radiomics could be the first non-invasive investigation for disease risk stratification and guidance of treatment in patients with primary ccRCC.

MeSH terms

  • Biomarkers, Tumor
  • Carcinoma, Renal Cell / diagnostic imaging*
  • Carcinoma, Renal Cell / pathology*
  • Contrast Media
  • Humans
  • Imaging, Three-Dimensional
  • Kidney Neoplasms / diagnostic imaging*
  • Kidney Neoplasms / pathology*
  • Magnetic Resonance Imaging
  • Multimodal Imaging*
  • Neoplasm Grading
  • Neoplasm Staging
  • Positron-Emission Tomography
  • Retrospective Studies


  • Biomarkers, Tumor
  • Contrast Media