Spatial Integration of Protein and Chromosomal States Reveals Early Copy-Number Changes and Genotype-Associated Immune Neighborhoods in Serous Ovarian Cancer Evolution.

ORION-FISH uncovers early chromosomal copy-number changes and immune microenvironment differences in serous ovarian cancer at single-cell resolution.

• Why it matters: Understanding early genetic alterations and cell states in cancer progression is crucial for developing targeted interventions and improving diagnostic precision.
• What they did: The team developed ORION-FISH, a high-plex tissue imaging method combining DNA-FISH and single-cell registration, applied to high-grade serous ovarian carcinoma and its precursors, revealing subclonal heterogeneity and copy-number gains.
• The result: This approach links chromosomal alterations to protein phenotypes within intact tissue, enabling detailed analysis of early tumor evolution and immune interactions, which could inform early detection and personalized therapies.