Oncolytic virus

An oncolytic virus is a virus that preferentially infects and kills cancer cells. As the infected cancer cells are destroyed by oncolysis, they release new infectious virus particles or virions to help destroy the remaining tumour.[1][2] Oncolytic viruses are thought not only to cause direct destruction of the tumour cells, but also to stimulate host anti-tumour immune system responses.[3][4]

The potential of viruses as anti-cancer agents was first realised in the early twentieth century, although coordinated research efforts did not begin until the 1960s.[5] A number of viruses including adenovirus, reovirus, measles, herpes simplex, Newcastle disease virus, and vaccinia have been clinically tested as oncolytic agents.[6] Most current oncolytic viruses are engineered for tumour selectivity, although there are naturally occurring examples such as reovirus and the senecavirus,[7] resulting in clinical trials.[8]

The first oncolytic virus to be approved by a national regulatory agency was genetically unmodified ECHO-7 strain enterovirus RIGVIR, which was approved in Latvia in 2004 for the treatment of skin melanoma;[9] the approval was withdrawn in 2019. An oncolytic adenovirus, a genetically modified adenovirus named H101, was approved in China in 2005 for the treatment of head and neck cancer.[10] In 2015, talimogene laherparepvec (OncoVex, T-VEC), an oncolytic herpes virus which is a modified herpes simplex virus, became the first oncolytic virus to be approved for use in the U.S. and European Union, for the treatment of advanced inoperable melanoma.[11]

History

A connection between cancer regression and viruses has long been theorised, and case reports of regression noted in cervical cancer, Burkitt lymphoma, and Hodgkin lymphoma, after immunisation or infection with an unrelated virus appeared at the beginning of the 20th century.[12] Efforts to treat cancer through immunisation or virotherapy (deliberate infection with a virus), began in the mid-20th century.[12][13] As the technology for creating a custom virus did not exist, all early efforts focused on finding natural oncolytic viruses. During the 1960s, promising research involved using poliovirus,[14] adenovirus,[12] Coxsackie virus,[15] ECHO enterovirus RIGVIR,[16] and others.[13] The early complications were occasional cases of uncontrolled infection, resulting in significant morbidity and mortality; the very frequent development of an immune response, while harmless to the patient,[12] destroyed the virus and thus prevented it from destroying the cancer.[14] Only certain cancers could be treated through virotherapy was also recognised very early.[15] Even when a response was seen, these responses were neither complete nor durable.[12] The field of virotherapy was nearly abandoned for a time, as the technology required to modify viruses didn't exist and chemotherapy and radiotherapy technology enjoyed early success. However, now these technologies have been thoroughly developed, cancer is still a major cause of mortality and there is still a need for novel cancer therapies, this sidelined therapy has now gained renewed interest.[12][17]

Herpes simplex virus
Main article: Oncolytic herpes virus

Herpes simplex virus (HSV) was one of the first viruses to be adapted to attack cancer cells selectively, because it was well understood, easy to manipulate and relatively harmless in its natural state (merely causing cold sores) so likely to pose fewer risks. The herpes simplex virus type 1 (HSV-1) mutant 1716 lacks both copies of the ICP34.5 gene, and as a result is no longer able to replicate in terminally differentiated and non-dividing cells but will infect and cause lysis very efficiently in cancer cells, and this has proved to be an effective tumour-targeting strategy.[18][19] In a wide range of in vivo cancer models, the HSV1716 virus has induced tumour regression and increased survival times.[20][21][22]

In 1996, the first approval was given in Europe for a clinical trial using the oncolytic virus HSV1716. From 1997 to 2003, strain HSV1716 was injected into tumours of patients with glioblastoma multiforme, a highly malignant brain tumour, with no evidence of toxicity or side effects, and some long-term survivors.[23][24][25] Other safety trials have used HSV1716 to treat patients with melanoma and squamous-cell carcinoma of head and neck.[26][27] Since then other studies have shown that the outer coating of HSV1716 variants can be targeted to specific types of cancer cells,[28] and can be used to deliver a variety of additional genes into cancer cells, such as genes to split a harmless prodrug inside cancer cells to release toxic chemotherapy,[29] or genes which command infected cancer cells to concentrate protein tagged with radioactive iodine, so that individual cancer cells are killed by micro-dose radiation as well as by virus-induced cell lysis.[30]

Other oncolytic viruses based on HSV have also been developed and are in clinical trials.[31] One that has been approved by the FDA for advanced melanoma is Amgen's talimogene laherparepvec.[32]

Oncorine (H101)

The first oncolytic virus to be approved by a regulatory agency was a genetically modified adenovirus named H101 by Shanghai Sunway Biotech. It gained regulatory approval in 2005 from China's State Food and Drug Administration (SFDA) for the treatment of head and neck cancer.[10][33] Sunway's H101 and the very similar Onyx-15 (dl1520) have been engineered to remove a viral defense mechanism that interacts with a normal human gene p53, which is very frequently dysregulated in cancer cells.[33] Despite the promises of early in vivo lab work, these viruses do not specifically infect cancer cells, but they still kill cancer cells preferentially.[33] While overall survival rates are not known, short-term response rates are approximately doubled for H101 plus chemotherapy when compared to chemotherapy alone.[33] It appears to work best when injected directly into a tumour, and when any resulting fever is not suppressed.[33] Systemic therapy (such as through infusion through an intravenous line) is desirable for treating metastatic disease.[34] It is now marketed under the brand name Oncorine.[35]

Mechanisms of action

Immunotherapy

With advances in cancer immunotherapy such as immune checkpoint inhibitors, increased attention has been given to using oncolytic viruses to increase antitumor immunity.[36] There are two main considerations of the interaction between oncolytic viruses and the immune system.

Immunity as an obstacle

A major obstacle to the success of oncolytic viruses is the patient immune system which naturally attempts to deactivate any virus. This can be a particular problem for intravenous injection, where the virus must first survive interactions with the blood complement and neutralising antibodies.[37] It has been shown that immunosuppression by chemotherapy and inhibition of the complement system can enhance oncolytic virus therapy.[38][39][40]

Pre-existing immunity can be partly avoided by using viruses that are not common human pathogens. However, this does not avoid subsequent antibody generation. Yet, some studies have shown that pre-immunity to oncolytic viruses doesn't cause a significant reduction in efficacy.[41]

Alternatively, the viral vector can be coated with a polymer such as polyethylene glycol, shielding it from antibodies, but this also prevents viral coat proteins adhering to host cells.[42]

Another way to help oncolytic viruses reach cancer growths after intravenous injection, is to hide them inside macrophages (a type of white blood cell). Macrophages automatically migrate to areas of tissue destruction, especially where oxygen levels are low, characteristic of cancer growths, and have been used successfully to deliver oncolytic viruses to prostate cancer in animals.[43]

Immunity as an ally

Although it poses a hurdle by inactivating viruses, the patient's immune system can also act as an ally against tumors; infection attracts the attention of the immune system to the tumour and may help to generate useful and long-lasting antitumor immunity.[44][45] This essentially produces a personalised cancer vaccine.

Many cases of spontaneous remission of cancer have been recorded, though not fully understood, they are thought likely to be a result of a sudden immune response or infection.[46] Efforts to induce this phenomenon have used cancer vaccines (derived from cancer cells or selected cancer antigens), or direct treatment with immune-stimulating factors on skin cancers.[47] Some oncolytic viruses are very immunogenic and may by infection of the tumour, elicit an anti-tumor immune response, especially viruses delivering cytokines or other immune stimulating factors.[48][49]

Viruses selectively infect tumor cells because of their defective anti-viral response.[36] Imlygic, an attenuated herpes simplex virus, has been genetically engineered to replicate preferentially within tumor cells and to generate antigens that elicit an immune response.[36]

Oncolytic behaviour of wild-type viruses

Vaccinia virus

Vaccinia virus (VACV) is arguably the most successful live biotherapeutic agent because of its critical role in the eradication of smallpox, one of the most deadly diseases in human history. Long before the smallpox eradication campaign was launched, VACV was exploited as a therapeutic agent for the treatment of cancer. In 1922, Levaditi and Nicolau reported that VACV was able to inhibit the growth of various tumors in mice and rats. This was the first demonstration of viral oncolysis in the laboratory. This virus was subsequently shown to selectively infect and destroy tumor cells with great potency, while sparing normal cells, both in cell cultures and in animal models. Since vaccinia virus has long been recognized as an ideal backbone for vaccines due to its potent antigen presentation capability, this combines well with its natural oncolytic activities as an oncolytic virus for cancer immunotherapy.

Vesicular stomatitis virus

Vesicular stomatitis virus (VSV) is a rhabdovirus, consisting of 5 genes encoded by a negative sense, single-stranded RNA genome. In nature, VSV infects insects as well as livestock, where it causes a relatively localized and non-fatal illness. The low pathogenicity of this virus is due in large part to its sensitivity to interferons, a class of proteins that are released into the tissues and bloodstream during infection. These molecules activate genetic anti-viral defence programs that protect cells from infection and prevent spread of the virus. However, in 2000, Stojdl, Lichty et al.[50] demonstrated that defects in these pathways render cancer cells unresponsive to the protective effects of interferons and therefore highly sensitive to infection with VSV. Since VSV undergoes a rapid cytolytic replication cycle, infection leads to death of the malignant cell and roughly a 1000-fold amplification of virus within 24h. VSV is therefore highly suitable for therapeutic application, and several groups have gone on to show that systemically administered VSV can be delivered to a tumour site, where it replicates and induces disease regression, often leading to durable cures.[51][52][53][54] Attenuation of the virus by engineering a deletion of Met-51 of the matrix protein ablates virtually all infection of normal tissues, while replication in tumour cells is unaffected.[51]

Recent research has shown that this virus has the potential to cure brain tumours, thanks to its oncolytic properties.[55]

Poliovirus
Main article: PVSRIPO

Poliovirus is a natural invasive neurotropic virus, making it the obvious choice for selective replication in tumours derived from neuronal cells. Poliovirus has a plus-strand RNA genome, the translation of which depends on a tissue-specific internal ribosome entry site (IRES) within the 5' untranslated region of the viral genome, which is active in cells of neuronal origin and allows translation of the viral genome without a 5' cap. Gromeier et al. (2000)[56] replaced the normal poliovirus IRES with a rhinovirus IRES, altering tissue specificity. The resulting PV1(RIPO) virus was able to selectively destroy malignant glioma cells, while leaving normal neuronal cells untouched.[57]

Reovirus

Reoviruses, an acronym for respiratory enteric orphan virus, generally infect mammalian respiratory and bowel systems. Most people have been exposed to reovirus by adulthood; however, the infection does not typically produce symptoms. The link to the reovirus' oncolytic ability was established after it was discovered to reproduce well in various cancer cell lines and lyses these cells.[58]

Reolysin is a formulation of reovirus that is currently in clinical trials for the treatment of various cancers.[59]

Senecavirus

Senecavirus, also known as Seneca Valley Virus, is a naturally occurring wild-type oncolytic picornavirus discovered in 2001 as a tissue culture contaminate at Genetic Therapy, Inc. The initial isolate, SVV-001, is being developed as an anti-cancer therapeutic by Neotropix, Inc. under the name NTX-010 for cancers with neuroendocrine features including small cell lung cancer and a variety of pediatric solid tumours.

RIGVIR

RIGVIR is a drug that was approved by the State Agency of Medicines of the Republic of Latvia in 2004.[60] It was also approved in Georgia[61] and Armenia.[62] It is wild type ECHO-7, a member of echovirus group.[63] The potential use of echovirus as an oncolytic virus to treat cancer was discovered by Latvian scientist Aina Muceniece in the 1960s and 1970s.[63] The data used to register the drug in Latvia is not sufficient to obtain approval to use it in the US, Europe, or Japan.[63][64] As of 2017 there was no good evidence that RIGVIR is an effective cancer treatment.[65][66] On March 19, 2019, the manufacturer of ECHO-7, SIA LATIMA, announced the drug's removal from sale in Latvia, quoting financial and strategic reasons and insufficient profitability.[67] However, several days later an investigative TV show revealed that State Agency of Medicines had run laboratory tests on the vials, and found that the amount of ECHO-7 virus is of a much smaller amount than claimed by the manufacturer. According to agency's lab director, "It's like buying what you think is lemon juice, but finding that what you have is lemon-flavored water". In March 2019, the distribution of ECHO-7 in Latvia has been stopped.[68] Based on the request of some patients, medical institutions, and physicians, despite the suspension of the registration certificate, were allowed to continue use.[69]

Semliki Forest virus

Semliki Forest virus (SFV) is a virus that naturally infects cells of the central nervous system and causes encephalitis. A genetically engineered form has been pre-clinically tested as an oncolytic virus against the severe brain tumour type glioblastoma. The SFV was genetically modified with microRNA target sequences so that it only replicated in brain tumour cells and not in normal brain cells. The modified virus reduced tumour growth and prolonged survival of mice with brain tumours.[70] The modified virus was also found to efficiently kill human glioblastoma tumour cell lines.[70]

Other

The maraba virus, first identified in Brazilian sandflies, is being tested clinically.[71]

Coxsackievirus A21 is being developed by Viralytics under trade name Cavatak.[72] Coxsackievirus A21 belongs to Enterovirus C species.[73]

Engineering oncolytic viruses

Directed evolution

An innovative approach of drug development termed "directed evolution" involves the creation of new viral variants or serotypes specifically directed against tumour cells via rounds of directed selection using large populations of randomly generated recombinant precursor viruses. The increased biodiversity produced by the initial homologous recombination step provides a large random pool of viral candidates which can then be passed through a series of selection steps designed to lead towards a pre-specified outcome (e.g. higher tumor specific activity) without requiring any previous knowledge of the resultant viral mechanisms that are responsible for that outcome. The pool of resultant oncolytic viruses can then be further screened in pre-clinical models to select an oncolytic virus with the desired therapeutic characteristics.[74]

Directed evolution was applied on human adenovirus, one of many viruses that are being developed as oncolytic agents, to create a highly selective and yet potent oncolytic vaccine. As a result of this process, ColoAd1 (a novel chimeric member of the group B adenoviruses) was generated. This hybrid of adenovirus serotypes Ad11p and Ad3 shows much higher potency and tumour selectivity than the control viruses (including Ad5, Ad11p and Ad3) and was confirmed to generate approximately two logs more viral progeny on freshly isolated human colon tumour tissue than on matching normal tissue.[74]

Attenuation

Attenuation involves deleting viral genes, or gene regions, to eliminate viral functions that are expendable in tumour cells, but not in normal cells, thus making the virus safer and more tumour-specific. Cancer cells and virus-infected cells have similar alterations in their cell signalling pathways, particularly those that govern progression through the cell cycle.[75] A viral gene whose function is to alter a pathway is dispensable in cells where the pathway is defective, but not in cells where the pathway is active.

The enzymes thymidine kinase and ribonucleotide reductase in cells are responsible for DNA synthesis and are only expressed in cells which are actively replicating.[76] These enzymes also exist in the genomes of certain viruses (E.g. HSV, vaccinia) and allow viral replication in quiescent(non-replicating) cells,[77] so if they are inactivated by mutation the virus will only be able to replicate in proliferating cells, such as cancer cells.

Tumour targeting

There are two main approaches for generating tumour selectivity: transductional and non-transductional targeting.[78]

  • Transductional targeting involves modifying the viral coat proteins to target tumour cells while reducing entry to non-tumour cells. This approach to tumour selectivity has mainly focused on adenoviruses and HSV-1, although it is entirely viable with other viruses.[78]
  • Non-transductional targeting involves altering the genome of the virus so it can only replicate in cancer cells, most frequently as part of the attenuation of the virus.[78]
    • Transcription targeting can also be used, where critical parts of the viral genome are placed under the control of a tumour-specific promoter. A suitable promoter should be active in the tumour but inactive in the majority of normal tissue, particularly the liver, which is the organ that is most exposed to blood born viruses. Many such promoters have been identified and studied for the treatment of a range of cancers.[78]
    • Similarly, viral replication can be finely tuned with the use of microRNAs (miRNA) artificial target sites or miRNA response elements (MREs). Differential expression of miRNAs between healthy tissues and tumors permit to engineer oncolytic viruses detargeted from certain tissues of interest while allowing its replication in the tumor cells.

Double targeting with both transductional and non-transductional targeting methods is more effective than any one form of targeting alone.[79]

Further information: Oncolytic adenovirus

Reporter genes
Viral luciferase expression in a mouse tumour

Both in the laboratory and in the clinic it is useful to have a simple means of identifying cells infected by the experimental virus. This can be done by equipping the virus with "reporter genes" not normally present in viral genomes, which encode easily identifiable protein markers. One example of such proteins is GFP (green fluorescent protein) which, when present in infected cells, will cause a fluorescent green light to be emitted when stimulated by blue light.[80][81] An advantage of this method is that it can be used on live cells and in patients with superficial infected lesions, it enables rapid non-invasive confirmation of viral infection.[82] Another example of a visual marker useful in living cells is luciferase, an enzyme from the firefly which in the presence of luciferin, emits light detectable by specialized cameras.[80]

Vaccinia virus infected cells expressing beta-glucuronidase (blue colour)

The E. coli enzymes beta-glucuronidase and beta-galactosidase can also be encoded by some viruses. These enzymes, in the presence of certain substrates, can produce intense colored compounds useful for visualizing infected cells and also for quantifying gene expression.

Modifications to improve oncolytic activity

Oncolytic viruses can be used against cancers in ways that are additional to lysis of infected cells.

Suicide genes

Viruses can be used as vectors for delivery of suicide genes, encoding enzymes that can metabolise a separately administered non-toxic pro-drug into a potent cytotoxin, which can diffuse to and kill neighbouring cells. One herpes simplex virus, encoding a thymidine kinase suicide gene, has progressed to phase III clinical trials. The herpes simplex virus thymidine kinase phosphorylates the pro-drug, ganciclovir, which is then incorporated into DNA, blocking DNA synthesis.[83] The tumour selectivity of oncolytic viruses ensures that the suicide genes are only expressed in cancer cells, however a "bystander effect" on surrounding tumour cells has been described with several suicide gene systems.[84]

Suppression of angiogenesis

Angiogenesis (blood vessel formation) is an essential part of the formation of large tumour masses. Angiogenesis can be inhibited by the expression of several genes, which can be delivered to cancer cells in viral vectors, resulting in suppression of angiogenesis, and oxygen starvation in the tumour. The infection of cells with viruses containing the genes for angiostatin and endostatin synthesis inhibited tumour growth in mice. Enhanced antitumour activities have been demonstrated in a recombinant vaccinia virus encoding anti-angiogenic therapeutic antibody and with an HSV1716 variant expressing an inhibitor of angiogenesis.[85][86]

Radioiodine
Adenoviral NIS gene expression in a mouse tumour (Located at the crosshairs) following intravenous delivery of virus (Left) compared to an uninfected control mouse (Right)

Addition of the sodium-iodide symporter (NIS) gene to the viral genome causes infected tumour cells to express NIS and accumulate iodine. When combined with radioiodine therapy it allows local radiotherapy of the tumour, as used to treat thyroid cancer. The radioiodine can also be used to visualise viral replication within the body by the use of a gamma camera.[80] This approach has been used successfully preclinically with adenovirus, measles virus and vaccinia virus.[87][88][89]

Approved therapeutic agents

Oncolytic viruses in conjunction with existing cancer therapies

It is in conjunction with conventional cancer therapies that oncolytic viruses have often showed the most promise, since combined therapies operate synergistically with no apparent negative effects.[95]

Clinical trials

Onyx-015 (dl1520) underwent trials in conjunction with chemotherapy before it was abandoned in the early 2000s. The combined treatment gave a greater response than either treatment alone, but the results were not entirely conclusive.[96] Vaccinia virus GL-ONC1 was studied in a trial combined with chemo- and radiotherapy as Standard of Care for patients newly diagnosed with head & neck cancer.[97] Herpes simplex virus, adenovirus, reovirus and murine leukemia virus are also undergoing clinical trials as a part of combination therapies.[98]

Pre-clinical research

Chen et al. (2001)[99] used CV706, a prostate-specific adenovirus, in conjunction with radiotherapy on prostate cancer in mice. The combined treatment resulted in a synergistic increase in cell death, as well as a significant increase in viral burst size (the number of virus particles released from each cell lysis). No alteration in viral specificity was observed.

SEPREHVIR (HSV-1716) has also shown synergy in pre-clinical research when used in combination with several cancer chemotherapies.[100][101]

The anti-angiogenesis drug Bevacizumab (anti-VEGF antibody) has been shown to reduce the inflammatory response to oncolytic HSV and improve virotherapy in mice.[102] A modified oncolytic vaccinia virus encoding a single-chain anti-VEGF antibody (mimicking Bevacizumab) was shown to have significantly enhanced antitumor activities than parental virus in animal models.[103]

In fiction

In science fiction, the concept of an oncolytic virus was first introduced to the public in Jack Williamson's novel Dragon's Island, published in 1951, although Williamson's imaginary virus was based on a bacteriophage rather than a mammalian virus.[104] Dragon's Island is also known for being the source of the term "genetic engineering".[105]

The plot of the Hollywood film I Am Legend is based on the premise that a worldwide epidemic was caused by a viral cure for cancer.[106]

In the Fox Broadcasting Company TV series House Season 2 Episode 19, a strain of Herpes simplex virus is shown to have shrunk a hepatic tumor.

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See also

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Further reading
  • Harrington KJ, Vile RG, Pandha HS (2008). Viral Therapy of Cancer. Hoboken, N.J.: Wiley. ISBN 978-0-470-01922-1.
  • Kirn DH, Liu T, Thorne SH, eds. (2011). Oncolytic Viruses: Methods and Protocols (Methods in Molecular Biology). New York: Humana Press. ISBN 978-1-61779-339-4.
  • Sinkovics JG, Horvath J, eds. (2005). Viral therapy of human cancers. New York: Dekker. ISBN 978-0-8247-5913-1.
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