Emerging technologies and current challenges in intratumoral microbiota research

Area of Science:

• Oncology
• Microbiology
• Bioinformatics

Background:

• Intratumoral microbiota are key in the tumor microenvironment, impacting cancer initiation, metastasis, immunity, and treatment response.
• Low microbial biomass presents detection and reproducibility challenges due to contamination and lack of standardized methods.
• Variability in protocols complicates cross-study comparisons and evidence consolidation.

Purpose of the Study:

• To review recent technological advancements addressing challenges in intratumoral microbiota research.
• To highlight how new methods enable sensitive detection, spatial localization, and mechanistic study of tumor-associated microbes.
• To discuss the integration of microbiome data for biomarker discovery and microbe-guided therapeutic strategies in precision oncology.

Main Methods:

• Improved contamination control and decontamination algorithms for reliable microbial detection.
• High-resolution techniques: single-cell RNA sequencing, spatial transcriptomics, anaerobic cultivation.
• Genome-resolved and enzyme-level analyses, organoid co-culture models, and AI-assisted data integration.

Main Results:

• Enhanced reliability in detecting microbes in low-biomass tumor tissues.
• Sensitive identification, spatial mapping, and mechanistic insights into tumor-associated microbes.
• Revealed microbial metabolic pathways influencing immunity, drug resistance, and tumor progression.

Conclusions:

• Standardization and advanced technologies are crucial for moving beyond descriptive profiling to mechanistic understanding.
• New approaches facilitate the study of host-microbe-immune interactions and microbiota's role in therapy response.
• Unlocking the potential of intratumoral microbiota is key for developing novel microbe-guided precision oncology strategies.