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Cancer Res. 2015 Sep 1;75(17):3446-55. doi: 10.1158/0008-5472.CAN-14-3051. Epub 2015 Jun 9.

Correlation between Density of CD8+ T-cell Infiltrate in Microsatellite Unstable Colorectal Cancers and Frameshift Mutations: A Rationale for Personalized Immunotherapy.

Author information

1
Inserm U1079, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France.
2
Inserm U1079, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France. Department of Gastroenterology, Poitiers University Hospital, Poitiers, France. Laboratoire Inflammation Tissus Epithéliaux et Cytokines, Poitiers University, Poitiers, France.
3
Inserm U1138, Laboratory of Integrative Cancer Immunology, Paris, France. Université Paris Descartes, Paris, France. Cordeliers Research Centre, Université Pierre et Marie Curie, Paris 6, Paris, France.
4
Inserm U1138, Laboratory of Integrative Cancer Immunology, Paris, France. Université Paris Descartes, Paris, France. Cordeliers Research Centre, Université Pierre et Marie Curie, Paris 6, Paris, France. AstraZeneca Pharmaceuticals, Alderley Park, Cheshire, United Kingdom.
5
Imaging Core Facility, CMABIO, Caen University Hospital, Caen, France.
6
Inserm U982, Institute for Research and Innovation in Biomedicine (IRIB), Rouen University, France.
7
Biostatistics Unit, Inserm U657, Rouen University Hospital, Rouen University, Rouen, France.
8
Department of Genetics, Rouen University Hospital, Rouen, France. Department of Gastroenterology, Le Havre Hospital, Le Havre, France.
9
Department of Pathology, Rouen University Hospital, Rouen, France.
10
Department of Digestive Surgery, Rouen University Hospital, Rouen, France.
11
Inserm U1079, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France. Department of Pathology, Rouen University Hospital, Rouen, France.
12
Department of Gastroenterology, Rouen University Hospital, Rouen, France.
13
Inserm U1079, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France. Department of Genetics, Rouen University Hospital, Rouen, France.
14
Inserm U1079, Institute for Research and Innovation in Biomedicine (IRIB), Rouen, France. Department of Genetics, Rouen University Hospital, Rouen, France. jean-baptiste.latouche@chu-rouen.fr.

Abstract

Colorectal cancers with microsatellite instability (MSI) represent 15% of all colorectal cancers, including Lynch syndrome as the most frequent hereditary form of this disease. Notably, MSI colorectal cancers have a higher density of tumor-infiltrating lymphocytes (TIL) than other colorectal cancers. This feature is thought to reflect the accumulation of frameshift mutations in sequences that are repeated within gene coding regions, thereby leading to the synthesis of neoantigens recognized by CD8(+) T cells. However, there has yet to be a clear link established between CD8(+) TIL density and frameshift mutations in colorectal cancer. In this study, we examined this link in 103 MSI colorectal cancers from two independent cohorts where frameshift mutations in 19 genes were analyzed and CD3(+), CD8(+), and FOXP3(+) TIL densities were quantitated. We found that CD8(+) TIL density correlated positively with the total number of frameshift mutations. TIL densities increased when frameshift mutations were present within the ASTE1, HNF1A, or TCF7L2 genes, increasing even further when at least one of these frameshift mutations was present in all tumor cells. Through in vitro assays using engineered antigen-presenting cells, we were able to stimulate peripheral cytotoxic T cells obtained from colorectal cancer patients with peptides derived from frameshift mutations found in their tumors. Taken together, our results highlight the importance of a CD8(+) T cell immune response against MSI colorectal cancer-specific neoantigens, establishing a preclinical rationale to target them as a personalized cellular immunotherapy strategy, an especially appealing goal for patients with Lynch syndrome.

PMID:
26060019
DOI:
10.1158/0008-5472.CAN-14-3051
[Indexed for MEDLINE]
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