Abstract
Objectives
To assess whether integrative radiomics and transcriptomics analyses could provide novel insights for radiomic features’ molecular annotation and effective risk stratification in non-small cell lung cancer (NSCLC).
Methods
A total of 627 NSCLC patients from three datasets were included. Radiomics features were extracted from segmented 3-dimensional tumour volumes and were z-score normalized for further analysis. In transcriptomics level, 186 pathways and 28 types of immune cells were assessed by using the Gene Set Variation Analysis (GSVA) algorithm. NSCLC patients were categorized into subgroups based on their radiomic features and pathways enrichment scores using consensus clustering. Subgroup-specific radiomics features were used to validate clustering performance and prognostic value. Kaplan–Meier survival analysis with the log-rank test and univariable and multivariable Cox analyses were conducted to explore survival differences among the subgroups.
Results
Three radiotranscriptomics subtypes (RTSs) were identified based on the radiomics and pathways enrichment profiles. The three RTSs were characterized as having specific molecular hallmarks: RTS1 (proliferation subtype), RTS2 (metabolism subtype), and RTS3 (immune activation subtype). RTS3 showed increased infiltration of most immune cells. The RTS stratification strategy was validated in a validation cohort and showed significant prognostic value. Survival analysis demonstrated that the RTS strategy could stratify NSCLC patients according to prognosis (p = 0.009), and the RTS strategy remained an independent prognostic indicator after adjusting for other clinical parameters.
Conclusions
This radiotranscriptomics study provides a stratification strategy for NSCLC that could provide information for radiomics feature molecular annotation and prognostic prediction.
Key Points
• Radiotranscriptomics subtypes (RTSs) could be used to stratify molecularly heterogeneous patients.
• RTSs showed relationships between molecular phenotypes and radiomics features.
• The RTS algorithm could be used to identify patients with poor prognosis.
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Abbreviations
- CI:
-
Confidence interval
- DICOM:
-
Digital Imaging and Communications in Medicine
- FPKM:
-
Fragments per kilobase of transcript per million mapped reads
- GLCM:
-
Gray level cooccurrence matrix
- GLDM:
-
Gray level dependence matrix
- GLRLM:
-
Gray level run length matrix
- GLSZM:
-
Gray level size zone matrix
- GSVA:
-
Gene Set Variation Analysis
- HR:
-
Hazard ratio
- K-M:
-
Kaplan-Meier
- NGTDM:
-
Neighbouring gray tone difference matrix
- NSCLC:
-
Non-small cell lung cancer
- ROI:
-
Region of interest
- RTS:
-
Radiotranscriptomics subtype
- TCIA:
-
The Cancer Imaging Archive
- UMAP:
-
Uniform manifold approximation and projection
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Acknowledgements
The authors acknowledge The Cancer Imaging Archive (TCIA) and Gene Expression Omnibus (GEO) databases for sharing their dataset publicly. The authors also thank the guidance of professor Sandy Napel and professor Leonard Wee.
Funding
This study has received funding by Guangxi Natural Science Foundation under Grant (No. 2020GXNSFDA238005) and Innovation Project of Guangxi Graduate Education (No. YCBZ2022077).
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The scientific guarantor of this publication is Hong Yang.
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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
No complex statistical methods were necessary for this paper.
Informed consent
Written informed consent was obtained from all subjects (patients) in this study.
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Institutional Review Board approval was obtained.
Study subjects or cohorts overlap
Some study subjects or cohorts have been previously reported in Aerts HJ et al. Decoding tumour phenotype by noninvasive imaging using a quantitative radiomics approach. Nat Commun 5:4006; Bakr S et al. A radiogenomic dataset of non-small cell lung cancer. Sci Data 5:180202.
Methodology
• retrospective
• observational
• multicenter study
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Lin, P., Lin, Yq., Gao, Rz. et al. Integrative radiomics and transcriptomics analyses reveal subtype characterization of non-small cell lung cancer. Eur Radiol 33, 6414–6425 (2023). https://doi.org/10.1007/s00330-023-09503-5
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DOI: https://doi.org/10.1007/s00330-023-09503-5