Key Points
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The concept of immunosurveillance implies that the immune system can recognize and destroy most precursors of cancer. Cancer cells avoid immunosurveillance by the selection of non-immunogenic tumour-cell variants (which is known as immunoselection) and by the active suppression of the immune response (which is known as immunosubversion).
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The development of cancer is inhibited by several mechanisms that suppress tumours, many of which function in a cell-intrinsic manner. The activation of oncogenes can trigger the DNA-damage response, which controls pre-malignant lesions through the activation of several types of molecule: DNA-damage sensors, such as ATM (ataxia-telangiectasia mutated) and ATR (ATM and Rad3 related); checkpoint kinases, such as CHK1 (checkpoint kinase 1 homologue) and CHK2; and the tumour-suppressor protein p53. ATM, ATR and CHK2 can also induce the expression of ligands for NKG2D (natural-killer group 2, member D) by tumour cells, thereby activating a cytotoxic response by NKG2D-expressing lymphocytes involved in immunosurveillance.
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Cancers have six recognized hallmarks, each of which influences the immunological characteristics of tumour cells. First, tumours can become self-sufficient for growth signals by producing autocrine and paracrine growth factors that have immunosuppressive characteristics. Second, tumours become insensitive to antigrowth signals (such as transforming growth factor-β), which induce local immunosuppression. Third, tumours evade apoptosis by overexpressing mitochondrial cell-death inhibitors (which are potential tumour antigens) and avoid caspase activation (which is required for immunogenic cell death). Fourth, limitless replication is associated with overexpression of TERT (telomerase reverse transcriptase) and mutation of p53, two potential tumour antigens. Fifth, sustained angiogenesis involves tumour production of angiogenic factors, such as vascular endothelial growth factor, that inhibit dendritic-cell maturation and T-cell activation. Sixth, local invasion and metastasis are also associated with beneficial and deleterious changes in the immunological characteristics of tumours.
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We favour the existence of a seventh, partly independent, hallmark of cancer, as has previously been proposed by other researchers. This hallmark is the avoidance of immune recognition by alteration of tumour-cell characteristics, as well as by creation of a local immunosuppressive network that inactivates innate and adaptive cytolytic effectors.
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Immunoselection is likely to have the main role in the early stages of carcinogenesis, whereas immunosubversion gradually accompanies advancing tumour growth, although there might be exceptions to this.
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The complete and permanent success of anticancer therapy relies on the induction of a productive immune response that eliminates residual tumour cells that have survived chemotherapy or radiotherapy. Immunostimulatory strategies that are designed to counter immunosubversion will be crucial for the development of an immunogenic chemotherapeutic regimen. Some current chemotherapeutic regimens have immunostimulatory effects, perhaps partly explaining their antitumour efficacy.
Abstract
Numerous innate and adaptive immune effector cells and molecules participate in the recognition and destruction of cancer cells, a process that is known as cancer immunosurveillance. But cancer cells avoid such immunosurveillance through the outgrowth of poorly immunogenic tumour-cell variants (immunoselection) and through subversion of the immune system (immunosubversion). At the early stages of carcinogenesis, cell-intrinsic barriers to tumour development seem to be associated with stimulation of an active antitumour immune response, whereas overt tumour development seems to correlate with changes in the immunogenic properties of tumour cells. The permanent success of treatments for cancer might depend on using immunogenic chemotherapy to re-establish antitumour immune responses.
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Acknowledgements
The authors are supported by grants from the European Union, the Ligue Nationale contre le Cancer (France), Cancéropôle Île-de-France (France) and the Institut National du Cancer (France).
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Glossary
- Angiogenesis
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The development of new blood vessels from existing blood vessels. It is frequently associated with tumour development and inflammation.
- Natural killer T cells
-
(NKT cells). A heterogeneous subset of T cells that are characterized by the co-expression of semi-invariant T-cell receptor α-chains together with NK-cell markers.
- Perforin
-
A component of cytolytic granules that participates in the permeabilization of plasma membranes, allowing granzymes and other cytotoxic components to enter target cells.
- NKG2D
-
(Natural-killer group 2, member D). A lectin-type activating receptor that is encoded by the NK complex and is expressed at the surface of NK cells, NKT cells, γδ T cells and some cytolytic CD8+ αβ T cells. The ligands for NKG2D are MHC-class-I-polypeptide-related sequence A (MICA) and MICB in humans, and retinoic acid early transcript 1 (RAE1) and H60 in mice. Such ligands are generally expressed at the surface of infected, stressed or transformed cells.
- IFN-producing killer DC
-
(IKDC). A dendritic cell (DC) that expresses markers of both natural killer cells and B cells but lacks markers of plasmacytoid DCs and T cells, as well as co-stimulatory molecules. These DCs have been isolated only in mouse models. They respond to a large variety of tumour cells by producing interferon-γ (IFNγ), and they kill these tumour cells in the absence of exogenous stimulation.
- Pre-malignant
-
An intermediate step before full transformation into a tumour cell has occurred.
- Monoclonal gammopathy
-
A tumour (most of which develop into multiple myelomas) that is derived from B cells and produces one type of monoclonal antibody, which can be detected in the serum.
- Tumour-suppressor protein
-
A protein encoded by a gene that, when eliminated or inactivated, allows the development of cancer. These proteins often determine cell-cycle checkpoints or facilitate the induction of apoptosis.
- p53
-
An important transcription factor that is activated by many genotoxic insults and induces cellular senescence or apoptosis. The gene that encodes p53 is frequently mutated or functionally inactivated in cancer cells.
- T helper 1 cell
-
(TH1 cell). There are two main subsets of activated CD4+ T cells: TH1 cells and TH2 cells. TH1 cells produce interferon-γ and tumour-necrosis factor, thereby promoting cell-mediated immunity. TH2 cells produce interleukin-4 (IL-4), IL-5 and IL-13, thereby supporting humoral immunity and counteracting TH1-cell responses.
- CD4+CD25+ regulatory T cell
-
(TReg cell). A T cell that expresses CD4, CD25 (also known as the interleukin-2 receptor α-chain) and the transcription factor T-bet, and is activated in an antigen-specific, MHC-class-II-restricted manner, but inhibits T cells and natural killer cells in a nonspecific manner, in part by producing transforming growth factor-β.
- Chediak–Higashi syndrome
-
A rare autosomal recessive genetic disorder that is caused by mutations in the gene CHS1 (Chediak–Higashi syndrome 1; also known as LYST), which is involved in lysosome fission and secretion.
- Oncogene
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A gene that when overexpressed or when incorporating a gain-of-function mutation contributes to oncogenesis.
- DNA-damage response
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The cellular response that is usually elicited by agents that damage DNA, such as ionizing radiation or mutagenic chemicals. The response involves the activation of DNA-damage foci, which have phosphorylated histone H2AX (histone 2A family, member X) as a hallmark, and it elicits cell-cycle arrest, DNA repair or apoptosis.
- Senescence
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An almost irreversible stage of permanent arrest in the gap 0/1 (G0/1) stage of the cell cycle. Such arrest is associated with morphological changes (flattening of the cells), metabolic changes, and gene-expression changes (including induction of expression of the senescence-associated protein β-galactosidase), the induction of which depends on the tumour-suppressor protein p53 and cell-cycle blockers such as WAF1 (wild-type p53-activated fragment 1; also known as p21) and INK4A (also known as p16).
- Mitochondrial outer-membrane permeabilization
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(MOMP). An apoptosis-associated process that results in the release of apoptosis-inducing proteins — such as cytochrome c, apoptosis-inducing factor, and second mitochondria-derived activator of caspase (also known as DIABLO) — from the mitochondrial intermembrane space into the cytosol.
- Death receptors
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A family of cell-surface receptors that can mediate cell death following ligand-induced trimerization. The best-studied members include tumour-necrosis-factor (TNF) receptor 1, CD95 (also known as FAS) and two receptors for TNF-related apoptosis-inducing ligand (TRAILR1 and TRAILR2).
- Caspases
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A family of cysteine proteases that cleave proteins carboxy-terminal to asparagine residues. Initiator caspases are typically activated in response to particular stimuli: for example, caspase-8 is activated after death-receptor ligation; caspase-9, after apoptosome activation; caspase-2, after DNA damage. By contrast, effector caspases (that is, caspase-3, caspase-6 and caspase-7) are particularly important for the ordered dismantling of vital cellular structures.
- B-cell-lymphoma-2 family
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(BCL-2 family). A family of proteins that contain at least one BCL-2-homology domain (BH). The family is classified into three groups: anti-apoptotic multidomain proteins, such as BCL-2, BCL-XL and MCL1 (myeloid-cell leukaemia sequence 1), which contain four BHs; pro-apoptotic multidomain proteins, such as BAX (BCL-2-associated X protein) and BAK (BCL-2 antagonist/killer), which contain three BHs; and a pro-apoptotic subfamily of proteins that contain only one BH, the BH3-only proteins.
- Apoptosome
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A complex that forms when cytochrome c is released from mitochondria and interacts with the cytosolic protein apoptotic-protease-activating factor 1 (APAF1), which in turn recruits pro-caspase-9. In the presence of ATP, this interaction results in the allosteric activation of caspase-9 and the formation of a caspase-3-activation complex.
- Cathepsins
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A class of cysteine proteases that are localized mainly in lysosomes and lysosome-like organelles.
- Damage-associated molecular pattern molecules
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(DAMPs). As a result of cellular stress, cellular damage and non-physiological cell death, DAMPs are released from the degraded stroma (for example, hyaluronate), from the nucleus (for example, high-mobility group box 1 protein, HMGB1) and from the cytosol (for example, ATP, uric acid, S100 calcium-binding proteins and heat-shock proteins). Such DAMPs are thought to elicit local inflammatory reactions.
- Cross-priming
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The initiation of a CD8+ T-cell response to an antigen that is not present within antigen-presenting cells (APCs). This occurs through the ability of certain APCs to present peptides that are derived from exogenous antigens in the context of MHC class I molecules. This property is atypical, because the peptides that are presented in the context of MHC class I molecules by most cells are derived from endogenous proteins.
- Exosomes
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Small lipid-bilayer vesicles that are released from dendritic cells (DCs) and tumour cells. Characteristically, exosomes are enriched in MHC complexes, tetraspanins, and heat-shock protein 70 (HSP70) and HSP90, all of which could be cross-presented by DCs to activate T cells.
- Plasmacytoid DC
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An immature dendritic cell (DC) with a morphology that resembles that of a plasmablast. Plasmacytoid DCs produce large amounts of type I interferons in response to viral infection.
- Microsatellite instability
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A term that refers to tumours in which genetic instability occurs as a result of a high mutation rate, mainly in short nucleotide repeats (which are known as microsatellites). Cancers with microsatellite instability are associated with defects in DNA mismatch-repair genes.
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Zitvogel, L., Tesniere, A. & Kroemer, G. Cancer despite immunosurveillance: immunoselection and immunosubversion. Nat Rev Immunol 6, 715–727 (2006). https://doi.org/10.1038/nri1936
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DOI: https://doi.org/10.1038/nri1936
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