Targeting WRN Helicase in Microsatellite-Instable Colorectal Cancer Induces Antitumor Immunity through Extrachromosomal Circular DNA Release.

Targeting WRN helicase in MSI colorectal cancer induces immune activation by releasing extrachromosomal circular DNA, enhancing antitumor responses.

• Why it matters: MSI colorectal cancers often resist immune checkpoint inhibitors, creating a need for new strategies to boost immunotherapy effectiveness and overcome resistance.
• What they did: Researchers used small-molecule WRN inhibitors in MSI CRC cells and models, observing that WRN inhibition caused cell death and eccDNA release, which stimulated immune responses.
• The result: Blocking eccDNA formation negated immune effects, and combining WRN inhibitors with anti-PD-1 therapy significantly improved tumor control, supporting combined treatment approaches.