Immunogenomics of colorectal cancer response to immune checkpoint blockade

Study ID Alternative Stable ID Type
EGAS00001004438 Other

Study Description

Molecular and cellular determinants of response to immune checkpoint inhibitors are mostly unknown. Here we use whole exome, RNA and T cell receptor sequencing, imaging mass cytometry, immunohistochemistry and PD1-PDL1 interaction detection to profile 543 regions from 16 colorectal cancers (CRCs) subsequently treated with Pembrolizumab or Nivolumab. Independent of treatment response, CRCs express low levels of PD1 and PDL1 proteins and form less PD1-PDL1 complex than other cancers. Non hypermutated CRCs have no benefit from treatment, show WNT activation and low T cell infiltrates. Among hypermutated CRCs, those with durable benefit have clonal immunogenic alterations, clonally expanded T cells and potential for immune escape through dysfunctional antigen presentation. Responsive tumours are enriched in PD1-expressing cytotoxic and proliferating CD8 T cells and PDL1-expressing antigen presenting macrophages, which form high-density clusters of interacting cells. Our study shows that immune checkpoint inhibitors are most effective in highly infiltrated CRCs where they may release the ... (Show More)

Study Datasets 2 datasets.

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Dataset ID Description Technology Samples
BAM files of RNA sequencing (RNA-seq) experiment on multi-regional colorectal cancer (CRC) samples. 58 samples corresponding to 16 patients were sequenced and there is one BAM file for each sample.
Illumina HiSeq 4000 88
BAM files of Whole Exome Sequencing (WES) experiment on multi-regional colorectal cancer (CRC) samples. 32 tumour and 16 normal samples corresponding to 16 patients were sequenced, which makes 32 tumour BAMs and 16 normal BAMs (48 BAMs in total).
Illumina HiSeq 4000 48

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