Dense Longitudinal Multi Omics Reveals Microbial Metabolic Immune Succession During Immune Checkpoint Therapy

Dense longitudinal multi-omics in a single metastatic colorectal cancer patient on immune checkpoint therapy linked a temporally ordered gut microbial metabolic–immune succession to sustained tumor regression, spanning 7.3 months.

• Why it matters: Relationships among gut microbes, microbial functions, intestinal metabolism, and host immunity during ICI response remain incompletely resolved, especially when cross-sectional snapshots miss transient states.
• What they did: The study analyzed 11 serial stool samples with 16S rRNA sequencing, metatranscriptomics, metabolomics, lipidomics, and stool host RNA immune profiling, aligned to serial imaging.
• The result: Microbial abundance and transcription were often discordant, and taxon-resolved functional analysis showed sequential microbial states: early Bacteroides/Fusobacterium function loss with purine/sphingolipid remodeling, then transient Bifidobacterium fermentation at T5, and Clostridium transcriptional emergence with lipid/coenzyme A activation at T6.