Single-cell transcriptomic landscape deciphers olfactory neuroblastoma subtypes and intra-tumoral heterogeneity

Area of Science:

• Oncology
• Genomics
• Immunology

Background:

• Olfactory neuroblastoma (ONB) is a rare cancer arising from the olfactory epithelium.
• The intricate tumor microenvironment (TME) and cellular heterogeneity of ONB are not well understood.

Purpose of the Study:

• To explore the cellular components and intra-tumoral heterogeneity of olfactory neuroblastoma.
• To establish a classification system for ONB based on gene expression patterns.
• To identify potential therapeutic strategies, including precision chemotherapy and immunotherapy.

Main Methods:

• Single-cell RNA sequencing was performed on ten ONB tumors and one olfactory mucosa sample.
• Analysis of malignant epithelial cells identified unique expression programs.
• Tumor microenvironment subclusters and cell-cell interactions were investigated.

Main Results:

• Five unique expression programs were identified in malignant epithelial cells, leading to a three-classification system (neural, basal, mesenchymal) for ONB.
• Biomarkers were elucidated for categorizing bulk tumors into subtypes.
• The tumor microenvironment analysis revealed a high abundance of immunosuppressive tumor-associated macrophages.

Conclusions:

• The established classification system aids in understanding ONB heterogeneity and may guide precision chemotherapy.
• The presence of immunosuppressive macrophages suggests potential efficacy of macrophage-targeting immunotherapies for ONB.