Study

Gut microbiome modulates response to anti PD1 immunotherapy in metastatic melanoma patients

Study ID Alternative Stable ID Type
EGAS00001002698 Other

Study Description

There is a growing appreciation of the role of the microbiome in cancer, and evidence in pre-clinical models that the gut microbiome may modulate responses to immune checkpoint blockade though this has not been well-characterized in patients. We analyzed the oral (n=86)and gut (n=43) 16S microbiome in melanoma patients on PD-1 blockade. Significant differences were noted in the diversity and composition of the gut microbiome between responders and non-responders in patients with a fecal microbiome sample, with significantly higher alpha diversity and relative abundance of Ruminococcaceae bacteria) in R. Metagenomic studies (n=25) revealed functional differences in gut bacteria in R including enrichment of anabolic pathways. Immune profiling demonstrated enhanced systemic and anti-tumor immunity in patients with a favorable gut microbiome as well as in germ-free mice receiving fecal transplant from responding patients. Together, these data have important implications for treatment with immune checkpoint blockade in cancer. The fastq files associated with this dataset are stored at ... (Show More)

Study Datasets 2 datasets.

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Dataset ID Description Technology Samples
EGAD00001003797
This dataset contains WES data (.bam files) and associated phenotype information from 10 patients included in our microbiome study who went on to anti PD-1 immunotherapy for the treatment of metastatic melanoma at the University of Texas MD Anderson Cancer Center. Both tumor and matching germ line normal were sequenced on each patient using Illumina HiSeq 2500. The average coverage was 283X in tumors and 135X in germline (tumor+germline overall:209, Range: 0-1552).
Illumina HiSeq 2500 20
EGAD00001003943
The oral and gut microbiomes of melanoma patients were characterized before the initiation of ant-PD1 immunotherapy, and compared to treatment response. Validation studies were performed in germ-free mice using stool from patients who responded/did not respond to ant-PD1 immunotherapy. All baseline oral(n=86) and gut (n=43) microbiome samples were subject to 16S sequencing - V4 region ( merged fastq files have been made available through this portal). Whole genome shotgun sequencing (WGS) was ... (Show More)
167

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