Immunotherapy

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Immunotherapy
CAR T-cell Therapy.svg
The diagram above represents the process of chimeric antigen receptor T-cell therapy (CAR), this is a method of immunotherapy, which is a growing practice in the treatment of cancer. The final result should be a production of equipped T-cells that can recognize and fight the infected cancer cells in the body.
  1. T-cells (represented by objects labeled as 't') are removed from the patient's blood.
  2. Then in a lab setting the gene that encodes for the specific antigen receptors are incorporated into the T-cells.
  3. Thus producing the CAR receptors (labeled as c) on the surface of the cells.
  4. The newly modified T-cells are then further harvested and grown in the lab.
  5. After a certain time period, the engineered T-cells are infused back into the patient.
MeSH D007167
OPS-301 code 8-03

Immunotherapy or biological therapy is the treatment of disease by activating or suppressing the immune system. Immunotherapies designed to elicit or amplify an immune response are classified as activation immunotherapies, while immunotherapies that reduce or suppress are classified as suppression immunotherapies . Immunotherapy is under preliminary research for its potential to treat various forms of cancer. [1] [2] [3] [4]

Contents

Cell-based immunotherapies are effective for some cancers. [5] [6] Immune effector cells such as lymphocytes, macrophages, dendritic cells, natural killer cells, and cytotoxic T lymphocytes work together to defend the body against cancer by targeting abnormal antigens expressed on the surface of tumor cells. Vaccine-induced immunity to COVID-19 relies mostly on an immunomodulatory T-cell response. [7]

Therapies such as granulocyte colony-stimulating factor (G-CSF), interferons, imiquimod and cellular membrane fractions from bacteria are licensed for medical use. Others including IL-2, IL-7, IL-12, various chemokines, synthetic cytosine phosphate-guanosine (CpG) oligodeoxynucleotides and glucans are involved in clinical and preclinical studies.

Immunomodulators

Immunomodulators are the active agents of immunotherapy. They are a diverse array of recombinant, synthetic, and natural preparations. [8]

ClassExample agents
Interleukins IL-2, IL-7, IL-12
Cytokines Interferons, G-CSF
Chemokines CCL3, CCL26, CXCL7
Immunomodulatory imide drugs (IMiDs) thalidomide and its analogues (lenalidomide, pomalidomide, and apremilast), BCG vaccine, [9] [10] & Covid vaccines [11] [12] [7]
Othercytosine phosphate-guanosine, oligodeoxynucleotides, glucans

Activation immunotherapies

Cancer

Cancer treatment used to be focused on killing or removing cancer cells and tumours, with chemotherapy or surgery or radiation. In 2018 the Nobel Prize in Physiology or Medicine was awarded to James P. Allison and Tasuku Honjo "for their discovery of cancer therapy by inhibition of negative immune regulation." Cancer immunotherapy attempts to stimulate the immune system to destroy tumours. A variety of strategies are in use or are undergoing research and testing. Randomized controlled studies in different cancers resulting in significant increase in survival and disease free period have been reported [2] and its efficacy is enhanced by 20–30% when cell-based immunotherapy is combined with conventional treatment methods. [2]

One of the oldest forms of cancer immunotherapy is the use of BCG vaccine, which was originally to vaccinate against tuberculosis and later was found to be useful in the treatment of bladder cancer. [13] BCG immunotherapy induces both local and systemic immune responses. The mechanisms by which BCG immunotherapy mediates tumor immunity have been widely studied, but they are still not completely understood. [14]

The use of monoclonal antibodies in cancer therapy was first introduced in 1997 with rituximab, an anti-CD20 antibody for treatment of B cell lymphoma. [15] Since then several monoclonal antibodies have been approved for treatment of various haematological malignancies as well as for solid tumours. [16] [17]

The extraction of G-CSF lymphocytes from the blood and expanding in vitro against a tumour antigen before reinjecting the cells with appropriate stimulatory cytokines. The cells then destroy the tumour cells that express the antigen. [18] Topical immunotherapy utilizes an immune enhancement cream (imiquimod) which produces interferon, causing the recipient's killer T cells to destroy warts, [19] actinic keratoses, basal cell cancer, vaginal intraepithelial neoplasia, [20] squamous cell cancer, [21] [22] cutaneous lymphoma, [23] and superficial malignant melanoma. [24] Injection immunotherapy ("intralesional" or "intratumoural") uses mumps, candida, the HPV vaccine [25] [26] or trichophytin antigen injections to treat warts (HPV induced tumours).

Adoptive cell transfer has been tested on lung [27] and other cancers, with greatest success achieved in melanoma.

Dendritic cell-based pump-priming or vaccination

Dendritic cells (DC) can be stimulated to activate a cytotoxic response towards an antigen. Dendritic cells, a type of antigen-presenting cell, are harvested from the person needing the immunotherapy. These cells are then either pulsed with an antigen or tumour lysate or transfected with a viral vector, causing them to display the antigen. Upon transfusion into the person, these activated cells present the antigen to the effector lymphocytes (CD4+ helper T cells, cytotoxic CD8+ T cells and B cells). This initiates a cytotoxic response against tumour cells expressing the antigen (against which the adaptive response has now been primed). The first FDA-approved cell-based immunotherapy, [28] the cancer vaccine Sipuleucel-T is one example of this approach. [29] The Immune Response Corporation [30] (IRC) developed this immunotherapy and licensed the technology to Dendreon, which obtained FDA clearance.

The current approaches for DC-based vaccination are mainly based on antigen loading on in vitro-generated DCs from monocytes or CD34+ cells, activating them with different TLR ligands, cytokine combinations, and injecting them back to the patients. The in vivo targeting approaches comprise administering specific cytokines (e.g., Flt3L, GM-CSF) and targeting the DCs with antibodies to C-type lectin receptors or agonistic antibodies (e.g., anti-CD40) that are conjugated with antigen of interest. Multiple, next-generation anti-CD40 platforms are being actively developed. [31] Future approach may target DC subsets based on their specifically expressed C-type lectin receptors or chemokine receptors. Another potential approach is the generation of genetically engineered DCs from induced pluripotent stem cells and use of neoantigen-loaded DCs for inducing better clinical outcome. [32]

T-cell adoptive transfer

Adoptive cell transfer in vitro cultivates autologous, extracted T cells for later transfusion. [33]

Alternatively, Genetically engineered T cells are created by harvesting T cells and then infecting the T cells with a retrovirus that contains a copy of a T cell receptor (TCR) gene that is specialised to recognise tumour antigens. The virus integrates the receptor into the T cells' genome. The cells are expanded non-specifically and/or stimulated. The cells are then reinfused and produce an immune response against the tumour cells. [34] The technique has been tested on refractory stage IV metastatic melanomas [33] and advanced skin cancer. [35] [36] [37] The first FDA-approved CAR-T drug, Kymriah, used this approach. To obtain the clinical and commercial supply of this CAR-T, Novartis purchased the manufacturing plant, the distribution system and hired the production team that produced Sipuleucel-T developed by Dendreon and the Immune Response Corporation. [38]

Whether T cells are genetically engineered or not, before re-infusion, lympho-depletion of the recipient is required to eliminate regulatory T cells as well as unmodified, endogenous lymphocytes that compete with the transferred cells for homeostatic cytokines. [33] [39] [40] [41] Lymphodepletion may be achieved by myeloablative chemotherapy, to which total body irradiation may be added for greater effect. [42] Transferred cells multiplied in vivo and persisted in peripheral blood in many people, sometimes representing levels of 75% of all CD8+ T cells at 6–12 months after infusion. [43] As of 2012, clinical trials for metastatic melanoma were ongoing at multiple sites. [44] Clinical responses to adoptive transfer of T cells were observed in patients with metastatic melanoma resistant to multiple immunotherapies. [45]

Checkpoint inhibitors

Anti-PD-1/PD-L1 and anti-CTLA-4 antibodies are the two types of checkpoint inhibitors currently available to patients. The approval of anti-cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) and anti-programmed cell death protein 1 (PD-1) antibodies for human use has already resulted in significant improvements in disease outcomes for various cancers. [46]

Although these molecules were originally discovered as molecules playing a role in T cell activation or apoptosis, subsequent preclinical research showed their important role in the maintenance of peripheral immune tolerance. [47]

Immune checkpoint inhibitors are approved to treat some patients with a variety of cancer types, including melanoma, breast cancer, bladder cancer, cervical cancer, colon cancer, lung cancer head and neck cancer, or Hodgkin lymphoma. [48] [49]

These therapies have revolutionized cancer immunotherapy as they showed for the first time in many years of research in metastatic melanoma, which is considered one of the most immunogenic human cancers, an improvement in overall survival, with an increasing group of patients benefiting long-term from these treatments, although caution remains needed for specific subgroups. [47] [50] [51]

The next generation of checkpoint inhibitors targets other receptors such as lymphocyte-activation gene 3 (LAG-3), T-cell immunoglobulin and mucin-domain containing-3 (TIM3), and T cell immunoreceptor with Ig and ITIM domains (TIGIT). Antibodies against these receptors have been evaluated in clinical studies, but have not yet been approved for widespread use. [52]

Immune enhancement therapy

Autologous immune enhancement therapy use a person's own peripheral blood-derived natural killer cells, cytotoxic T lymphocytes, epithelial cells and other relevant immune cells are expanded in vitro and then re-infused. [53] The therapy has been tested against hepatitis C, [54] [55] [56] chronic fatigue syndrome [57] [58] and HHV6 infection. [59]

Suppression immunotherapies

Immune suppression dampens an abnormal immune response in autoimmune diseases or reduces a normal immune response to prevent rejection of transplanted organs or cells.

Immunosuppressive drugs

Immunosuppressive drugs can be used to control the immune system with organ transplantation and with autoimmune disease. Immune responses depend on lymphocyte proliferation. Lymphocyte proliferation is the multiplication of lymphocyte cells used to fight and remember foreign invaders. [60] Cytostatic drugs are a type of immunosuppressive drug that aids in slowing down the growth of rapidly dividing cells. Another example of an immunosuppressive drug is Glucocorticoids which are more specific inhibitors of lymphocyte activation. Glucocorticoids work by emulating actions of natural actions of the body's adrenal glands to help suppress the immune system, which is helpful with autoimmune diseases|, [61] Alternatively, inhibitors of immunophilins more specifically target T lymphocyte activation, the process by which T-lymphocytes stimulate and begin to respond to a specific antigen, [62] There is also Immunosuppressive antibodies which target steps in the immune response to prevent the body from attacking its tissues, which is a problem with autoimmune diseases, [63] There are various other drugs that modulate immune responses and can be used to induce immune regulation. It was observed in a preclinical trial that regulation of the immune system by small immunosuppressive molecules such as vitamin D, dexamethasone, and curcumin could be helpful in preventing or treating chronic inflation. Given that the molecules are administered under a low-dose regimen and subcutaneously. A study provides a promising preclinical demonstration of the effectiveness and ease of preparation of Valrubicin-loaded immunoliposomes (Val-ILs) as a novel nanoparticle technology to target immunosuppressive cells. Val-ILs have the potential to be used as a precise and effective therapy based on targeted vesicle-mediated cell death of immunosuppressive cells. [64]

Immune tolerance

The body naturally does not launch an immune system attack on its own tissues. Models generally identify CD4+ T-cells at the centre of the autoimmune response. Loss of T-cell tolerance then unleashes B-cells and other immune effector cells on to the target tissue. The ideal tolerogenic therapy would target the specific T-cell clones co-ordinating the autoimmune attack. [65]

Immune tolerance therapies seek to reset the immune system so that the body stops mistakenly attacking its own organs or cells in autoimmune disease or accepts foreign tissue in organ transplantation. [66] A recent[ when? ] therapeutic approach is the infusion of regulatory immune cells into transplant recipients. The transfer of regulatory immune cells has the potential to inhibit the activity of effector. [67] [68]

Creating immune tolerance reduces or eliminates the need for lifelong immunosuppression and attendant side effects. It has been tested on transplantations, rheumatoid arthritis, type 1 diabetes and other autoimmune disorders.

Approaches to therapeutic tolerance induction [65] [69] [70]
ModalityDetails
Non-antigen specificMonoclonal Antibodies

Depleting:

Non-depleting:

Haematopoietic stem cell transplantationNon-myeloablativeMyeloablative
Mesenchymal stem cell transplantation
Regulatory T cell therapyNon-antigen specificAntigen-specific
Low dose IL-2 to expand regulatory T cells
Microbiome manipulation
Antigen specificPeptide therapySubcutaneous, intradermal, transmucosal (oral, inhaled)

Tolerogenic dendritic cells, liposomes and nanoparticles

Altered peptide ligands

Allergen immunotherapy

Immunotherapy can also be used to treat allergies. While allergy treatments (such as antihistamines or corticosteroids) treat allergic symptoms, immunotherapy can reduce sensitivity to allergens, lessening its severity. Allergen immunotherapy can also be referred to as allergen desensitization or hypo-sensitization. [71] Immunotherapy may produce long-term benefits. [72] Immunotherapy is partly effective in some people and ineffective in others, but it offers people with allergies a chance to reduce or stop their symptoms.[ citation needed ]

Subcutaneous allergen immunotherapy was first introduced in 1911 through the hypothesis that people with hay fever were sensitive to pollen from grass. A process was developed to create an extract by drawing out timothy pollen in distilled water and then boiling it. This was injected into patients in increasing doses to help alleviate symptoms. [73]

Allergen Immunotherapy is indicated for people who are extremely allergic or who cannot avoid specific allergens and when there is evidence of an IgE-mediated reaction that correlates with allergen symptoms. These IgE-mediated reactions can be identified via a blood IgE test or skin testing. If a specific IgE antibody is negative, there is no evidence that allergen immunotherapy will be effective for that patient.

However, there are risks associated with allergen immunotherapy as it is the administration of an agent the patient is known to be highly allergic to. Patients are at increased risk of fatal anaphylaxis, local reaction at the site of injection, or life-threatening systemic allergic reactions. [71]

A promising approach to treat food allergies is the use of oral immunotherapy (OIT). OIT consists in a gradual exposure to increasing amounts of allergen can lead to the majority of subjects tolerating doses of food sufficient to prevent reaction on accidental exposure. [74] Dosages increase over time, as the person becomes desensitized. This technique has been tested on infants to prevent peanut allergies. [75]

Helminthic therapies

Whipworm ova (Trichuris suis) and hookworm (Necator americanus) have been tested for immunological diseases and allergies, and have proved beneficial on multiple fronts, yet it is not entirely understood. Scientists have found that the immune response triggered by the burrowing of hookworm larvae to pass through the lungs and blood so the production of mast cells and specific antibodies are now present. They also reduce inflammation or responses ties to autoimmune diseases, but despite this, the hookworm's effects are considered to be negative typically. [76] Helminthic therapy has been investigated as a treatment for relapsing remitting multiple sclerosis, [77] Crohn's, [78] [79] [80] allergies and asthma. [81] While there is much to be learned about this, many researchers think that the change in the immune response is thanks to the parasites shifting to a more anti-inflammatory or regulatory system, which would in turn decrease inflammation and self inflicted immune damage as seen in Crohn's and multiple sclerosis. Specifically, MS patients saw lower relapse rates and calmer symptoms in some cases when experimenting with helminthic therapy. [82] Hypothesized mechanisms include re-polarisation of the Th1 / Th2 response [83] and modulation of dendritic cell function. [84] [85] The helminths downregulate the pro-inflammatory Th1 cytokines, interleukin-12 (IL-12), interferon-gamma (IFN-γ) and tumor necrosis factor-alpha (TNF-α), while promoting the production of regulatory Th2 cytokines such as IL-10, IL-4, IL-5 and IL-13. [83] [86]

Co-evolution with helminths has shaped some of the genes associated with interleukin expression and immunological disorders, such Crohn's, ulcerative colitis and celiac disease. Helminths' relationship to humans as hosts should be classified as mutualistic or symbiotic. [87] In some ways, the relationship is symbiotic because the worms themselves need the host (humans) for survival, because this body supplies them with nutrients and a home. From another perspective, it could be reasoned that it is mutualistic, being that the above information about benefits in autoimmune disorders continues to remain true and supported. Also, some say that the worms can regulate gut bacteria. [88] Another possibility is one of this being a parasitic relationship, arguing that the possibile rosks of anemia and other disorders outweighs the benefits, yet this is significantly less supported, with the research alluding to the mutualitic and symbiotic approach being much more likely.

See also

Related Research Articles

<span class="mw-page-title-main">Autoimmunity</span> Immune response against an organisms own healthy cells

In immunology, autoimmunity is the system of immune responses of an organism against its own healthy cells, tissues and other normal body constituents. Any disease resulting from this type of immune response is termed an "autoimmune disease". Prominent examples include celiac disease, diabetes mellitus type 1, Henoch–Schönlein purpura, systemic lupus erythematosus, Sjögren syndrome, eosinophilic granulomatosis with polyangiitis, Hashimoto's thyroiditis, Graves' disease, idiopathic thrombocytopenic purpura, Addison's disease, rheumatoid arthritis, ankylosing spondylitis, polymyositis, dermatomyositis, and multiple sclerosis. Autoimmune diseases are very often treated with steroids.

<span class="mw-page-title-main">Natural killer cell</span> Type of cytotoxic lymphocyte

Natural killer cells, also known as NK cells, are a type of cytotoxic lymphocyte critical to the innate immune system. They are a kind of large granular lymphocytes (LGL), and belong to the rapidly expanding family of known innate lymphoid cells (ILC) and represent 5–20% of all circulating lymphocytes in humans. The role of NK cells is analogous to that of cytotoxic T cells in the vertebrate adaptive immune response. NK cells provide rapid responses to virus-infected cells, stressed cells, tumor cells, and other intracellular pathogens based on signals from several activating and inhibitory receptors. Most immune cells detect the antigen presented on major histocompatibility complex I (MHC-I) on infected cell surfaces, but NK cells can recognize and kill stressed cells in the absence of antibodies and MHC, allowing for a much faster immune reaction. They were named "natural killers" because of the notion that they do not require activation to kill cells that are missing "self" markers of MHC class I. This role is especially important because harmful cells that are missing MHC I markers cannot be detected and destroyed by other immune cells, such as T lymphocyte cells.

<span class="mw-page-title-main">Immunoglobulin E</span> Immunoglobulin E (IgE) Antibody

Immunoglobulin E (IgE) is a type of antibody that has been found only in mammals. IgE is synthesised by plasma cells. Monomers of IgE consist of two heavy chains and two light chains, with the ε chain containing four Ig-like constant domains (Cε1–Cε4). IgE is thought to be an important part of the immune response against infection by certain parasitic worms, including Schistosoma mansoni, Trichinella spiralis, and Fasciola hepatica. IgE is also utilized during immune defense against certain protozoan parasites such as Plasmodium falciparum. IgE may have evolved as a defense to protect against venoms.

The regulatory T cells (Tregs or Treg cells), formerly known as suppressor T cells, are a subpopulation of T cells that modulate the immune system, maintain tolerance to self-antigens, and prevent autoimmune disease. Treg cells are immunosuppressive and generally suppress or downregulate induction and proliferation of effector T cells. Treg cells express the biomarkers CD4, FOXP3, and CD25 and are thought to be derived from the same lineage as naïve CD4+ cells. Because effector T cells also express CD4 and CD25, Treg cells are very difficult to effectively discern from effector CD4+, making them difficult to study. Research has found that the cytokine transforming growth factor beta (TGF-β) is essential for Treg cells to differentiate from naïve CD4+ cells and is important in maintaining Treg cell homeostasis.

<span class="mw-page-title-main">Allergen immunotherapy</span> Medical treatment for environmental allergies

Allergen immunotherapy, also known as desensitization or hypo-sensitization, is a medical treatment for environmental allergies and asthma. Immunotherapy involves exposing people to larger and larger amounts of allergens in an attempt to change the immune system's response.

<span class="mw-page-title-main">Cancer immunotherapy</span> Artificial stimulation of the immune system to treat cancer

Cancer immunotherapy (immuno-oncotherapy) is the stimulation of the immune system to treat cancer, improving the immune system's natural ability to fight the disease. It is an application of the fundamental research of cancer immunology (immuno-oncology) and a growing subspecialty of oncology.

<span class="mw-page-title-main">Cytotoxic T-lymphocyte associated protein 4</span> Mammalian protein found in humans

Cytotoxic T-lymphocyte associated protein 4, (CTLA-4) also known as CD152, is a protein receptor that functions as an immune checkpoint and downregulates immune responses. CTLA-4 is constitutively expressed in regulatory T cells but only upregulated in conventional T cells after activation – a phenomenon which is particularly notable in cancers. It acts as an "off" switch when bound to CD80 or CD86 on the surface of antigen-presenting cells. It is encoded by the gene CTLA4 in humans.

<span class="mw-page-title-main">Helminthic therapy</span> Deliberate infestation with parasitic worms

Helminthic therapy, an experimental type of immunotherapy, is the treatment of autoimmune diseases and immune disorders by means of deliberate infestation with a helminth or with the eggs of a helminth. Helminths are parasitic worms such as hookworms, whipworms, and threadworms that have evolved to live within a host organism on which they rely for nutrients. The theory behind helminth therapy is that these worms reduce negative immune responses due to their TH2 immune response that downregulates the abnormal T-cell responses recently associated with autoimmune disorders. This therapy ties to the Hygiene hypothesis in that the lack of exposure to bacteria and parasites such as helminths can cause a weaker immune system leading to being more susceptible to autoimmune disease.

<span class="mw-page-title-main">CD40 (protein)</span> Mammalian protein found in humans

Cluster of differentiation 40, CD40 is a type I transmembrane protein found on antigen-presenting cells and is required for their activation. The binding of CD154 (CD40L) on TH cells to CD40 activates antigen presenting cells and induces a variety of downstream effects.

Immune tolerance, also known as immunological tolerance or immunotolerance, refers to the immune system's state of unresponsiveness to substances or tissues that would otherwise trigger an immune response. It arises from prior exposure to a specific antigen and contrasts the immune system's conventional role in eliminating foreign antigens. Depending on the site of induction, tolerance is categorized as either central tolerance, occurring in the thymus and bone marrow, or peripheral tolerance, taking place in other tissues and lymph nodes. Although the mechanisms establishing central and peripheral tolerance differ, their outcomes are analogous, ensuring immune system modulation.

Primary immunodeficiencies are disorders in which part of the body's immune system is missing or does not function normally. To be considered a primary immunodeficiency (PID), the immune deficiency must be inborn, not caused by secondary factors such as other disease, drug treatment, or environmental exposure to toxins. Most primary immunodeficiencies are genetic disorders; the majority are diagnosed in children under the age of one, although milder forms may not be recognized until adulthood. While there are over 430 recognized inborn errors of immunity (IEIs) as of 2019, the vast majority of which are PIDs, most are very rare. About 1 in 500 people in the United States are born with a primary immunodeficiency. Immune deficiencies can result in persistent or recurring infections, auto-inflammatory disorders, tumors, and disorders of various organs. There are currently limited treatments available for these conditions; most are specific to a particular type of PID. Research is currently evaluating the use of stem cell transplants (HSCT) and experimental gene therapies as avenues for treatment in limited subsets of PIDs.

<span class="mw-page-title-main">CD20</span> Mammalian protein found in humans

B-lymphocyte antigen CD20 or CD20 is B lymphocyte cell-surface molecule.

<span class="mw-page-title-main">Ipilimumab</span> Pharmaceutical drug

Ipilimumab, sold under the brand name Yervoy, is a monoclonal antibody medication that works to activate the immune system by targeting CTLA-4, a protein receptor that downregulates the immune system.

<span class="mw-page-title-main">Cancer immunology</span> Study of the role of the immune system in cancer

Cancer immunology (immuno-oncology) is an interdisciplinary branch of biology and a sub-discipline of immunology that is concerned with understanding the role of the immune system in the progression and development of cancer; the most well known application is cancer immunotherapy, which utilises the immune system as a treatment for cancer. Cancer immunosurveillance and immunoediting are based on protection against development of tumors in animal systems and (ii) identification of targets for immune recognition of human cancer.

Chemoimmunotherapy is chemotherapy combined with immunotherapy. Chemotherapy uses different drugs to kill or slow the growth of cancer cells; immunotherapy uses treatments to stimulate or restore the ability of the immune system to fight cancer. A common chemoimmunotherapy regimen is CHOP combined with rituximab (CHOP-R) for B-cell non-Hodgkin lymphomas.

<span class="mw-page-title-main">Tumor-infiltrating lymphocytes</span>

Tumor-infiltrating lymphocytes (TIL) are white blood cells that have left the bloodstream and migrated towards a tumor. They include T cells and B cells and are part of the larger category of ‘tumor-infiltrating immune cells’ which consist of both mononuclear and polymorphonuclear immune cells, in variable proportions. Their abundance varies with tumor type and stage and in some cases relates to disease prognosis.

Gamma delta T cells are T cells that have a γδ T-cell receptor (TCR) on their surface. Most T cells are αβ T cells with TCR composed of two glycoprotein chains called α (alpha) and β (beta) TCR chains. In contrast, γδ T cells have a TCR that is made up of one γ (gamma) chain and one δ (delta) chain. This group of T cells is usually less common than αβ T cells. Their highest abundance is in the gut mucosa, within a population of lymphocytes known as intraepithelial lymphocytes (IELs).

<span class="mw-page-title-main">NT5E</span> Enzyme converting AMP to adenosine

5′-nucleotidase (5′-NT), also known as ecto-5′-nucleotidase or CD73, is an enzyme that in humans is encoded by the NT5E gene. CD73 commonly serves to convert AMP to adenosine.

Adoptive cell transfer (ACT) is the transfer of cells into a patient. The cells may have originated from the patient or from another individual. The cells are most commonly derived from the immune system with the goal of improving immune functionality and characteristics. In autologous cancer immunotherapy, T cells are extracted from the patient, genetically modified and cultured in vitro and returned to the same patient. Comparatively, allogeneic therapies involve cells isolated and expanded from a donor separate from the patient receiving the cells.

Peptide-based synthetic vaccines are subunit vaccines made from peptides. The peptides mimic the epitopes of the antigen that triggers direct or potent immune responses. Peptide vaccines can not only induce protection against infectious pathogens and non-infectious diseases but also be utilized as therapeutic cancer vaccines, where peptides from tumor-associated antigens are used to induce an effective anti-tumor T-cell response.

References

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