A multicancer study mapped tumor‑associated microbiota and found overlapping microbial signatures across breast, colorectal and lung cancers. The multidisciplinary team reported conserved taxa and functional pathways that correlate with tumor biology and patient outcomes, suggesting shared microbe‑host interactions across tissue types. The authors discuss implications for biomarker development and microbiome‑directed therapeutics, while noting the need for causal validation and standardized sampling to separate tumor‑resident microbes from contaminants.