Cancer Clinical Trial
Official title:
The Gut Microbiome and Immunotherapy Response in Solid Cancers
The aim of this study is characterize the gastrointestinal microbiomes of patient with solid cancer undergoing standard of care treatment with programmed cell death protein 1 (PD-1) /programmed cell death ligand (PD-L1) blockade.
Frontline treatment for solid cancers such as renal cell carcinoma includes immunotherapies such as immune checkpoint inhibitor (ICI) therapy. Despite an increase in overall survival in cancer patients undergoing ICI therapy, many patients' tumors are unresponsive or eventually progress. Recent studies indicate that the gut microbiome composition is associated with clinical response to ICI treatment. Following the success of preclinical research, two recent studies investigated the efficacy of fecal microbiota transplant (FMT) from cancer patients responsive to programmed cell-death protein 1 (PD-1) blockade, a type of ICI treatment, to patients nonresponsive to treatment. Notably, 30-40% of the FMT recipients in these studies subsequently responded to anti-PD-1 therapy. However, the effectiveness of FMT may vary among donors, there is no clear agreement on the ideal FMT composition, and FMT carries the risk of transmitting infection. An alternative to FMT is identification of specific efficacious commensals for supplementation. While the specific commensals enriched in cancer patients with more favorable outcomes vary from study to study, several are commonly reported, including Akkermansia muciniphila, Bacteroides spp., Bifidobacterium spp., Ruminococcaceae spp., and Faecalibacterium spp. Cancer-related fatigue is experienced by nearly all patients during treatment, and cancer-related cognitive impairment (CRCI), which is a decrease in neurocognitive functioning that can be caused by cancer or its treatment, is present in up to ¾ of patients during treatment. Fatigue and CRCI have both been linked to the composition of the gut microbiome in cancer patients. Specific Aims Specific Aim 1: Characterize the gut microbiome of solid cancer patients that have had disease progression during standard-of-care treatment with PD-1 or programmed cell death ligand 1 (PD-L1) blockade and compare to solid cancer patients that were stable or experienced tumor shrinkage during standard-of-care treatment with PD-1/PD-L1 blockade. Specific Aim 2: Assess neuropsychological measures of cognition and fatigue in solid cancer patients undergoing standard-of-care treatment with PD-1/PD-L1 blockade and determine associations with composition of the gut microbiome. ;
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