Characterization of Continuous Transcriptional Heterogeneity in High-Risk Blastemal-Type Wilms' Tumors Using...

Area of Science:

• Pediatric Oncology
• Developmental Biology
• Computational Biology

Background:

• Wilms' tumors are pediatric cancers linked to abnormal kidney development.
• Tumor heterogeneity in Wilms' tumors is continuous and not well understood.
• Blastemal-type Wilms' tumors show diverse, poorly differentiated cell states.

Purpose of the Study:

• To computationally characterize the continuous heterogeneity in high-risk blastemal-type Wilms' tumors.
• To identify distinct tumor archetypes and their relationship to fetal kidney development.
• To provide a basis for improved quantitative tumor stratification and classification.

Main Methods:

• Utilized three computational approaches: Pareto task inference, generative probabilistic "grade of membership" model, and cellular deconvolution.
• Analyzed high-risk blastemal-type Wilms' tumors.
• Modeled tumor heterogeneity as a continuum with distinct archetypes.

Main Results:

• Wilms' tumors form a triangle-shaped continuum in latent space.
• Identified three archetypes with "stromal", "blastemal", and "epithelial" characteristics, mirroring fetal kidney development stages.
• Each tumor is a unique mixture of these archetypes and fetal kidney-like cell states.

Conclusions:

• Wilms' tumors exhibit a developmental continuum reflecting aberrant kidney development.
• Computational models can represent tumor heterogeneity as mixtures of archetypes.
• Findings support quantitative strategies for Wilms' tumor stratification and classification.