Phage therapy

Phage therapy, viral phage therapy, or phagotherapy is the therapeutic use of bacteriophages for the treatment of pathogenic bacterial infections.[1][2][3] This therapeutic approach emerged at the beginning of the 20th century but was progressively replaced by the use of antibiotics in most parts of the world after the second world war. Bacteriophages, known as phages, are a form of virus[4] that attach to bacterial cells, and inject their genome into the cell.[5] The viral genome effectively replaces the bacterial genome, halting the bacterial infection.[5] The bacterial cell causing the infection is unable to reproduce, and instead produces additional phages.[4] Phages are very selective in the strains of bacteria they are effective against.[5]

Phage injecting its genome into bacterial cell
An electron micrograph of bacteriophages attached to a bacterial cell. These viruses are the size and shape of coliphage T1.

Advantages include reduced side-effects and reduced risk of the bacterium developing resistance since [5] bacteriophages are much more specific than antibiotics. They are typically harmless not only to the host organism but also to other beneficial bacteria, such as the gut microbiota, reducing the chances of opportunistic infections.[6] They have a high therapeutic index, that is, phage therapy would be expected to give rise to few side effects, even at higher-than-therapeutic levels.[7] Because phages replicate in vivo (in cells of living organism), a smaller effective dose can be used.[8]

Disadvantages include the difficulty of finding an effective phage for a particular infection: a phage will kill a bacterium only if it matches the specific strain.[5] However, virulent phages can be isolated much more easily than other compounds and natural products.[8] Consequently, phage mixtures ("cocktails") are sometimes used to improve the chances of success.[9] Alternatively, samples taken from recovering patients sometimes contain appropriate phages that can be grown to cure other patients infected with the same strain.[10] Ongoing challenges include the need to increase phage collections from reference phage banks, the development of efficient phage screening methods for the fast identification of the therapeutic phage(s), the establishment of efficient phage therapy strategies to tackle infectious biofilms, the validation of feasible phage production protocols that assure quality and safety of phage preparations, and the guarantee of stability of phage preparations during manufacturing, storage and transport.

Phages tend to be more successful than antibiotics where there is a biofilm covered by a polysaccharide layer, which antibiotics typically cannot penetrate.[11] However, the interactions between phages and biofilms can be complex, with phages developing symbiotic as well as predatory relationships with biofilms.[9]

Phages are currently being used therapeutically to treat bacterial infections that do not respond to conventional antibiotics,[2][1][12] particularly in Russia[13] and Georgia.[14][15][16] There is also a phage therapy unit in Wrocław, Poland, established in 2005, which continues several decades long research of the Institute of Immunology and Experimental Therapy of the Polish Academy of Sciences, the only such centre in a European Union country.[17] Phages are the subject of renewed clinical attention in western countries, such as the United States. In 2019, the United States Food and Drug Administration approved the first US clinical trial for intravenous phage therapy.[18]

Phage therapy has many potential applications in human medicine as well as dentistry, veterinary science, and agriculture.[19] If the target host of a phage therapy treatment is not an animal, the term "biocontrol" (as in phage-mediated biocontrol of bacteria) is usually employed, rather than "phage therapy".[9]

HistoryEdit

 
Félix d'Hérelle, discoverer of phage therapy
 
Phage in action on cultured Bacillus anthracis.

The discovery of bacteriophages was reported by British bacteriologist Frederick Twort in 1915,[20] and by French-Canadian microbiologist Felix d'Hérelle in 1917.[21][22] D'Hérelle said that the phages always appeared in the stools of Shigella dysentery patients shortly before they began to recover.[23] He "quickly learned that bacteriophages are found wherever bacteria thrive: in sewers, in rivers that catch waste runoff from pipes, and in the stools of convalescent patients".[24] Phage therapy was immediately recognized by many to be a key way forward for the eradication of pathogenic bacterial infections. A Georgian, George Eliava, was making similar discoveries. He travelled to the Pasteur Institute in Paris where he met d'Hérelle, and in 1923 he founded the Eliava Institute in Tbilisi, Georgia, devoted to the development of phage therapy. Phage therapy is used in Russia, Georgia and Poland, and was used prophylactically for a time in the Soviet army.

In Russia, extensive research and development soon began in this field. In the United States during the 1940s commercialization of phage therapy was undertaken by Eli Lilly and Company.[25]

While knowledge was being accumulated regarding the biology of phages and how to use phage cocktails correctly, early uses of phage therapy were often unreliable.[26] Since the early 20th century, research into the development of viable therapeutic antibiotics had also been underway, and by 1942 the antibiotic penicillin G had been successfully purified and saw use during the Second World War. The drug proved to be extraordinarily effective in the treatment of injured Allied soldiers whose wounds had become infected. By 1944, large-scale production of Penicillin had been made possible, and in 1945 it became publicly available in pharmacies. Due to the drug's success, it was marketed widely in the U.S. and Europe, leading Western scientists to mostly lose interest in further use and study of phage therapy for some time.[27]

Isolated from Western advances in antibiotic production in the 1940s, Russian scientists continued to develop already successful phage therapy to treat the wounds of soldiers in field hospitals. During World War II, the Soviet Union used bacteriophages to treat many soldiers infected with various bacterial diseases e.g. dysentery and gangrene.[28] Russian researchers continued to develop and to refine their treatments and to publish their research and results. However, due to the scientific barriers of the Cold War, this knowledge was not translated and did not proliferate across the world.[29][30] A summary of these publications was published in English in 2009 in "A Literature Review of the Practical Application of Bacteriophage Research".[31]

There is an extensive library and research center at the George Eliava Institute in Tbilisi, Georgia. Phage therapy is today a widespread form of treatment in that region.[32]

As a result of the development of antibiotic resistance since the 1950s and an advancement of scientific knowledge, there has been renewed interest worldwide in the ability of phage therapy to eradicate bacterial infections and chronic polymicrobial biofilm (including in industrial situations[33]).

Phages have been investigated as a potential means to eliminate pathogens like Campylobacter in raw food[34] and Listeria in fresh food or to reduce food spoilage bacteria.[35] In agricultural practice phages were used to fight pathogens like Campylobacter, Escherichia and Salmonella in farm animals, Lactococcus and Vibrio pathogens in fish from aquaculture and Erwinia, Xanthomonas, and others in plants of agricultural importance.[36][37][38] The oldest use was, however, in human medicine. Phages have been used against diarrheal diseases caused by E. coli, Shigella or Vibrio and against wound infections caused by facultative pathogens of the skin like staphylococci and streptococci. Recently the phage therapy approach has been applied to systemic and even intracellular infections and the addition of non-replicating phage and isolated phage enzymes like lysins to the antimicrobial arsenal. However, actual proof for the efficacy of these phage approaches in the field or the hospital is not available.[35]

Some of the interest in the West can be traced back to 1994, when Soothill demonstrated (in an animal model) that the use of phages could improve the success of skin grafts by reducing the underlying Pseudomonas aeruginosa infection.[39] Recent studies have provided additional support for these findings in the model system.[40]

Although not "phage therapy" in the original sense, the use of phages as delivery mechanisms for traditional antibiotics constitutes another possible therapeutic use.[41][42] The use of phages to deliver antitumor agents has also been described in preliminary in vitro experiments for cells in tissue culture.[43]

In June 2015 the European Medicines Agency hosted a one-day workshop on the therapeutic use of bacteriophages[44] and in July 2015 the National Institutes of Health (US) hosted a two-day workshop "Bacteriophage Therapy: An Alternative Strategy to Combat Drug Resistance".[45]

In January 2016, Phages were used successfully at Yale University by Benjamin Chan to treat a chronic Pseudomonas aeruginosa infection in ophthalmologist Ali Asghar Khodadoust.[46] This successful treatment of a life-threatening infection sparked a resurgence of interest in phage therapy in the United States.

In 2017, a pair of genetically engineered phages along with one naturally occurring (so-called "phage Muddy") each from among those catalogued by Science Education Alliance-Phages Hunters Advancing Genomics and Evolutionary Science (SEA-PHAGES) at the Howard Hughes Medical Institute by Graham Hatfull and colleagues, was used by microbiologist James Soothill at Great Ormond Street Hospital for Children in London to treat an antibiotic-resistant bacterial (Mycobacterium abscessus) infection in a young woman with cystic fibrosis.[47][48][49][50]

In 2022 two mycobacteriophages were administered intravenously twice daily to a young man with treatment-refractory Mycobacterium abscessus  pulmonary infection and severe cystic fibrosis lung disease.[51] Airway cultures for M. abscessus became negative after approximately 100 days of combined phage and antibiotic treatment, and a variety of biomarkers confirmed the therapeutic response. The individual received a bilateral lung transplant after 379 days of treatment, and cultures from the explanted lung tissue confirmed eradication of the bacteria.[51] In a second case, successful treatment of disseminated cutaneous Mycobacterium chelonae was reported with a single phage administered intravenously twice daily in conjunction with antibiotic and surgical management.[52]

Potential benefitsEdit

 
Phage therapy is the use of bacteriophages to treat bacterial infections. This could be used as an alternative to antibiotics when bacteria develop resistance. Superbugs that are immune to multiple types of drugs are becoming a concern with the more frequent use of antibiotics. Phages can target these dangerous microbes without harming human cells due to how specific they are.

Bacteriophage treatment offers a possible alternative to conventional antibiotic treatments for bacterial infection.[53] It is conceivable that, although bacteria can develop resistance to phages, the resistance might be easier to overcome than resistance to antibiotics.[54][55] Just as bacteria can evolve resistance, viruses can evolve to overcome resistance.[56]

Bacteriophages are very specific, targeting only one or a few strains of bacteria.[57] Traditional antibiotics have a more wide-ranging effect, killing both harmful bacteria and useful bacteria such as those facilitating food digestion.[58] The species and strain specificity of bacteriophages makes it unlikely that harmless or useful bacteria will be killed when fighting an infection.[59]

A few research groups in the West are engineering a broader spectrum phage, and also a variety of forms of MRSA treatments, including impregnated wound dressings, preventative treatment for burn victims, phage-impregnated sutures.[60][55] Enzybiotics are a new development at Rockefeller University that create enzymes from phage. Purified recombinant phage enzymes can be used as separate antibacterial agents in their own right.[61]

Phage therapy also has the potential of preventing or treating infectious diseases of corals. This could assist with decline of coral around the world.[62]

ApplicationsEdit

CollectionEdit

Phage for therapeutic use can be collected from environmental sources that likely contain high quantities of bacteria and bacteriophages, such as effluent outlets, sewage or even soil.[14] The samples are taken and applied to bacterial cultures that are to be targeted. If the bacteria die, as seen by plaques formed on a bacterial lawn, the phages can be grown in liquid cultures, which is then centrifuged to pellet the bacteria, and collected from the supernatant, which is then passed through a filter to remove all but the phages. The phage lysate can then be further tested to see which ones show growth suppression effects (lysogeny) or destruction (lysis) of the target bacteria.[10]

Modes of treatmentEdit

Phages are "bacterium-specific" and it is, therefore, necessary in many cases to take a swab from the patient and culture it prior to treatment. Occasionally, isolation of therapeutic phages can require a few months to complete, but clinics generally keep supplies of phage cocktails for the most common bacterial strains in a geographical area.

Phage cocktails are sold in pharmacies in eastern countries.[63][64] The composition of bacteriophagic cocktails has been periodically modified to add phages effective against emerging pathogenic strains.[65]

Phages in practice are applied orally, topically on infected wounds or spread onto surfaces, or used during surgical procedures. Injection is rarely used, avoiding any risks of trace chemical contaminants that may be present from the bacteria amplification stage, and recognizing that the immune system naturally fights against viruses introduced into the bloodstream or lymphatic system.

Reviews of phage therapy indicate that more clinical and microbiological research is needed to meet current standards.[66]

Clinical trialsEdit

Funding for phage therapy research and clinical trials is generally insufficient and difficult to obtain, since it is a lengthy and complex process to patent bacteriophage products. An official view[whose?] is that the effectiveness of each individual phage would need to be demonstrated separately, because administering them in combinations would be too complicated.[clarification needed] Due to the specificity of phages, phage therapy would be most effective as a cocktail injection, a modality generally rejected by the U.S. Food and Drug Administration (FDA). Therefore, researchers and observers have predicted that if phage therapy is to gain traction, the FDA must change its regulatory stance on combination drug cocktails.[6] Public awareness and education about phage therapy are generally limited to scientific or independent research rather than mainstream media.[67]

In 2007 Phase 1 and 2 clinical trials were completed at the Royal National Throat, Nose and Ear Hospital, London, for Pseudomonas aeruginosa infections (otitis).[68][69][70][71] Phase 1 clinical trials were conducted at the Southwest Regional Wound Care Center of Lubbock, Texas, for a cocktail of phages against P. aeruginosa, Staphylococcus aureus and Escherichia coli developed by Intralytix.[72] PhagoBurn, a Phase 1 and 2 trial of phage therapy against P. aeruginosa wound infection in France and Belgium in 2015–17, was terminated early due to lack of effectiveness.[73]

Locus Biosciences created a cocktail of three CRISPR-modified phages. A 2019 study examined its effectiveness against E. coli in the urinary tract.[74] In February 2019, the FDA approved the first clinical trial of intravenously administered phage therapy in the United States.[75]

In July 2020, the FDA approved the first clinical trial of nebulized phage therapy in the United States.[76] This double-blind, placebo-controlled study at Yale University will be focused on treating P. aeruginosa infections in patients with cystic fibrosis.

In February 2020, the FDA approved a clinical trial to evaluate bacteriophage therapy in patients with urinary tract infections.[77] The study started in December 2020 and aim to identify ideal bacteriophage treatment regimens based on improvements in disease control rates.

In February 2021, the FDA approved a clinical trial to evaluate bacteriophage therapy in patients with chronic prosthetic joint infections (PJI).[78] This study will start in October 2022 and be conducted by Adaptive Phage Therapeutics in collaboration with Mayo Clinic.

AdministrationEdit

Phages can usually be freeze-dried and turned into pills without materially reducing efficiency.[14] Temperature stability up to 55 °C and shelf lives of 14 months have been shown for some types of phages in pill form.[14] Application in liquid form is possible, stored preferably in refrigerated vials.[14] Oral administration works better when an antacid is included, as this increases the number of phages surviving passage through the stomach.[14] Topical administration often involves application to gauzes that are laid on the area to be treated.[14]

Successful treatmentsEdit

Phages were used successfully at Yale University by Benjamin Chan to treat a Pseudomonas infection in 2016.[46] Intravenous phage drip therapy was successfully used to treat a patient with multidrug-resistant Acinetobacter baumannii in Thornton Hospital at UC San Diego in 2017.[79] Nebulized phage therapy has been used successfully to treat numerous patients with cystic fibrosis and multidrug-resistant bacteria at Yale University as part of their compassionate use program.[80][81] In 2019, a Brownsville, Minnesota, resident with a longstanding bacterial infection in his knee received a phage treatment at the Mayo Clinic that eliminated the need for amputation of his lower leg.[82] Individualised phage therapy was also successfully used by Robert T. Schooley and others to treat a case of multi-drug-resistant Acinetobacter baumannii in 2015.[83][84] In 2022, an individually adjusted phage-antibiotic combination as an antimicrobial resistance treatment was demonstrated and described in detail.[85][86] The scientists called for scaling up the research[87] and for further development of this approach.[88]

LimitationsEdit

The high bacterial strain specificity of phage therapy may make it necessary for clinics to make different cocktails for treatment of the same infection or disease because the bacterial components of such diseases may differ from region to region or even person to person. In addition, this means that "banks" containing many different phages must be kept and regularly updated with new phages.[6]

Further, bacteria can evolve different receptors either before or during treatment. This can prevent phages from completely eradicating bacteria.[14]

The need for banks of phages makes regulatory testing for safety harder and more expensive under current rules in most countries. Such a process would make the large-scale use of phage therapy difficult. Additionally, patent issues (specifically on living organisms) may complicate distribution for pharmaceutical companies wishing to have exclusive rights over their "invention", which would discourage a commercial corporation from investing capital in this.

As has been known for at least thirty years, mycobacteria such as Mycobacterium tuberculosis have specific bacteriophages.[89] No lytic phage has yet been discovered for Clostridium difficile, which is responsible for many nosocomial diseases, but some temperate phages (integrated in the genome, also called lysogenic) are known for this species; this opens encouraging avenues but with additional risks as discussed below.

The negative public perception of viruses may also play a role in the reluctance to embrace phage therapy.[90]

Development of resistanceEdit

One of the major concerns usually associated with phage therapy is the emergence of phage-insensitive mutants (BIMs) that could hinder the success of this therapy. In fact, several in vitro studies have reported a fast emergence of BIMs within a short period of time after phage treatment.[91][92][93] The emergence of BIMs has also been observed in vivo using different animal models, although usually occurs later than in vitro (reviewed in [94]). This fast adaptation of bacteria to phage attack is usually caused by mutations on genes encoding phage receptors,[92][95] which include lipopolysaccharides (LPS), outer membrane proteins, capsules, flagella, pili, among others.[96] However, some studies suggested that when phage resistance is caused by mutations in phage receptors, this might result in fitness costs to the resistance bacterium, which will ultimately become less virulent.[94][97] Moreover, it has been shown that the evolution of bacterial resistance to phage attack changes the efflux pump mechanism, causing increased sensitivity to drugs from several antibiotic classes.[98] Therefore, it is conceivable to think that phage therapy that uses phages that exert selection for MDR bacteria to become antibiotic sensitive could potentially reduce the incidence of antibiotic resistant infections.

Besides the prevention of phage adsorption by loss or modification of bacterial receptors, phage-insensitivity can be caused by: (i) prevention of phage DNA entry by superinfection exclusion systems; (ii) degradation of phage DNA by restriction-modification systems or by CRISPR-Cas systems; and (iii) use of abortive infection systems that block phage replication, transcription or translation, usually in conjugation with suicide of the host cell.[99] Altogether, these mechanisms promote a quick adaptation of bacteria to phage attack and therefore, the emergence of phage-resistance mutants is frequent and unavoidable.

It is still unclear whether the wide use of phages would cause resistance similar to what has been observed for antibiotics. In theory this is not very likely to occur, since phages are very specific and therefore their selective pressure would affect a very narrow group of bacteria. However, we should also consider the fact that many phage resistance systems are mounted on mobile genetic elements, including prophages and plasmids, and thus may spread quite rapidly even without direct selection. Nevertheless, in contrast to antibiotics, phage preparations for therapeutic applications are expected to be developed in a personalized way because of the high specificity of phages. In addition, strategies have been proposed to counter the problem of phage resistance. One of the strategies is use of phage cocktails with complementary host ranges (different host ranges, which - when combined - result in an overall broader host range) and targeting different bacterial receptors. Another strategy is the combination of phages with other antimicrobials such as antibiotics, disinfectants or enzymes that could enhance their antibacterial activity. The genetic manipulation of phage genomes can also be a strategy to circumvent phage resistance.

Safety aspectsEdit

Bacteriophages are bacterial viruses, evolved to infect bacterial cells; to do that, phages must use characteristic structures at cell surfaces (receptors), and to propagate they need appropriate molecular tools inside the cells. Bacteria are Prokaryotes and their cells differ substantially from Eukaryotes including humans or animals.[100] For this reason phages meet the major safety requirement: they do not infect treated individuals. Even engineered phages and induced artificial internalization of phage into mammalian cells did not result in phage propagation. Internalization can be induced e.g. by adding adenovirus penton base protein on the phage surface, it allows for the attachment of engineered phages to integrin receptors and for endocytosis. These mimic adenoviral infection, but no resulting propagation of phage nor any cell damage were observed.[101] Natural transcytosis of unmodified phages, that is: uptake and internal transport to the other side of a cell, which was observed in human epithelial cells, did not result in phage propagation or cell damage.[102] Recently, however, it was reported that filamentous temperate phages of P. aeruginosa can be endocytosed into human and murine leukocytes, resulting in transcription of the phage DNA. In turn, the product RNA triggers maladaptive innate viral pattern-recognition responses and thus inhibits the immune clearance of the bacteria.[103] Whether this also applies to dsDNA phages like the Caudovirales has not yet been established; this is obviously an important question to be addressed as it may affect the overall safety of phage therapy.

Due to many experimental treatments in human patients conducted in past decades, and to already existing RCTs (see section: Clinical experience and randomized controlled trials), phage safety can be assessed directly. The first safety trial in healthy human volunteers for a phage was conducted by Bruttin and Brüssow in 2005;[104] they investigated the oral administration of Escherichia coli phage T4 and they found no adverse effects of the treatment. Historical record shows that phages are safe, with mild side effects if any. The most frequent (though still rare) adverse reactions to phage preparations found in patients were symptoms from the digestive tract, local reactions at the site of administration of a phage preparation, superinfections, and a rise in body temperature.[105][26][106] Notably, these reactions may have been (i) due to the liberation of endotoxins from bacteria lysed in vivo by the phages, since such effects also can be observed when antibiotics are used,[107] or (ii) caused by bacterial debris that accompanied phage in cases where unpurified lysates were used.

Bacteriophages must be produced in bacteria that are lysed (i.e. fragmented) during phage propagation. As such, phage lysates contain bacterial debris that may affect the human organism even when the phage itself is unharmful. For these and other reasons, purification of bacteriophages is considered important and phage preparations need to be assessed for their safety as the whole, particularly when phages are to be administered intravenously. This is consistent with general procedures for other drug candidates. In 2015, a group of phage therapy experts summarized Quality and Safety Requirements for Sustainable Phage Therapy.[108]

Phage effects on human microbiome also contribute to the safety issues in phage therapy. It is important to note that many phages, especially temperate phages, carry genes that can affect the pathogenicity of the host. Even the famous lambda, a temperate phage of the E. coli K-12 laboratory strain, carries two genes that provide potential virulence benefits to the lysogenic host, one that increases intestinal adherence and the other that confers resistance to complement killing in the blood. For this reason, temperate phages are generally to be avoided as candidates for phage therapy, although in some cases, the lack of lytic phage candidates and emergency conditions may make such considerations moot.[49] Another potential problem is generalized transduction, a term for the ability of some phages to transfer bacterial DNA from one host to another. This occurs because the systems for packaging of the phage DNA into capsids can mistakenly package host DNA instead. Indeed, with some well-characterized phages, up to 5% of the virus particles contain only bacterial DNA; thus in a typical lysate, the entire genome of the propagating host is present in more than a million copies in every milliliter. For these reasons, it is imperative that any phage to be considered for therapeutic usage should be subjected to thorough genomic analysis and tested for the capacity for generalized transduction.

As antibacterials, phages may also affect the composition of microbiomes, by infecting and killing phage-sensitive strains of bacteria. However, a major advantage of bacteriophages over antibiotics is the high specificity of bacteriophages; this specificity limits antibacterial activity to a sub-species level, typically a phage kills only selected bacterial strains. For this reason phages are much less likely (than antibiotics) to disturb the composition of natural microbiome or to induce dysbiosis. This was demonstrated in experimental studies where microbiome composition was assessed by next-generation sequencing (NGS) that revealed no important changes correlated with phage treatment in phage human treatments.[109][110][111][112][113][114]

Much of the difficulty in obtaining regulatory approval is proving to be the risks of using a self-replicating entity which has the capability to evolve.[33]

As with antibiotic therapy and other methods of countering bacterial infections, endotoxins are released by the bacteria as they are destroyed within the patient (Jarisch–Herxheimer reaction). This can cause symptoms of fever; in extreme cases toxic shock (a problem also seen with antibiotics) is possible.[115] Janakiraman Ramachandran[116] argues that this complication can be avoided in those types of infection where this reaction is likely to occur by using genetically engineered bacteriophages which have had their gene responsible for producing endolysin removed. Without this gene, the host bacterium still dies but remains intact because the lysis is disabled. On the other hand, this modification stops the exponential growth of phages, so one administered phage means at most one dead bacterial cell.[16] Eventually these dead cells are consumed by the normal house-cleaning duties of the phagocytes, which utilize enzymes to break down the whole bacterium and its contents into harmless proteins, polysaccharides and lipids.[117]

Temperate (or Lysogenic) bacteriophages are not generally used therapeutically, as this group can act as a way for bacteria to exchange DNA; this can help spread antibiotic resistance or even, theoretically, make the bacteria pathogenic (see Cholera). Carl Merril claimed that harmless strains of corynebacterium may have been converted into C. diphtheriae that "probably killed a third of all Europeans who came to North America in the seventeenth century".[118] Fortunately, many phages seem to be lytic only with negligible probability of becoming lysogenic.[119]

Regulation and legislationEdit

Approval of phage therapy for use in humans has not been given in Western countries with a few exceptions. In the United States, Washington and Oregon law allows naturopathic physicians to use any therapy that is legal any place in the world on an experimental basis,[120] and in Texas phages are considered natural substances and can be used in addition to (but not as a replacement for) traditional therapy (they have been used routinely in a wound care clinic in Lubbock, TX, since 2006).[121]

In 2013, "the 20th biennial Evergreen International Phage Meeting ... conference drew 170 participants from 35 countries, including leaders of companies and institutes involved with human phage therapies from France, Australia, Georgia, Poland and the United States."[122]

Since its inception in 1923, and until the 1980s, the Eliava Institute in Georgia has produced tons of therapeutic phage preparations, for the Red Army as well as for the civil sector, which led to the registration of phages for oral and topical applications as an over-the-counter product in pharmacies in several Member States of the former Soviet Union. Today, the phage production center and the pharmacy of the Eliava Institute manufacture and deliver several commercial phage preparations under a license from the Georgian government. The Ludwik Hirszfeld Institute of Immunology and Experimental Therapy in Wrocław has produced numerous phage formulations for phage therapy in different hospitals in Poland, and for many decades.

In France, phage therapy disappeared officially with the withdrawal of the Vidal dictionary (France's official drug directory) in 1978. The last phage preparation, produced by l'Institut du Bactériophage, was an ointment against skin infections. Phage therapy research ceased at about the same time in France, with the closure of the bacteriophage department at the Pasteur Institute. However, Professor J.-F. Vieu had collected several hundreds of phages potentially usable against staphylococci and digestive infections and the Pasteur Institutes of Paris and Lyon continued to provide these phages for medical use. As such, some hospital physicians continued to practice compassionate phage therapy until the 1990s when production eventually died out.[123]

On their rediscovery, at the end the 1990s, phage preparations were logically classified as medicines, i.e. "medicinal products" in the EU or "drugs" in the US.[124] However, the pharmaceutical legislation that had been implemented since their disappearance from Western medicine was mainly designed to cater for industrially-made pharmaceuticals, devoid of any customization and intended for large-scale distribution,[125] and it was not deemed necessary to provide phage-specific requirements or concessions. Today's phage therapy products need to comply with the entire battery of medicinal product licensing requirements: manufacturing according to GMP, preclinical studies, phase I, II and III clinical trials and marketing authorization. Technically, industrially produced predefined phage preparations could make it through the conventional pharmaceutical processes, minding some adaptations. However, phage specificity and resistance issues are likely to cause that these defined preparations will have a relatively short useful lifespan.[126] In addition, it appeared that the pharmaceutical industry, the stakeholder which is foreseen to develop and market industrially-made medicines, is currently not considering phage therapy products. Yet, a handful of small and medium-sized enterprises (SMEs) picked up the gauntlet, with the help of risk capital and/or public funding. The reality today is that decades after the renewed interest in the Western world, not one defined therapeutic phage product has made it to the EU or US markets, despite the fact that clinicians are under increasing pressure to use phages in the emergency treatment of multidrug-resistant bacterial infections.

 
Conventional drug development process vs. Magistral preparation

According to some, therapeutic phages should be prepared individually and kept in large phage banks, ready to be used, upon testing for effectiveness against the patient's bacterial pathogen(s). Intermediary or combined (industrially-made as well as precision phage preparations) approaches could be appropriate.[126] However, it turns out to be difficult to reconcile the classical phage therapy concepts, which are based on the timely adaptation of phage preparations, with the current Western pharmaceutical R&D and marketing models. The repeated calls for a specific regulatory framework have not been heeded by the European policymakers, who appear to be resistant to change in this regard.[125] A phage therapy framework based on the Biological Master File (BMF) concept has been proposed as a (European) solution to the regulatory issues, but the European regulation did not allow for an extension of this concept to biologically active substances such as phages.[127]

Meanwhile, responsible representatives from the medical, academic and regulatory communities have established some (temporary) national solutions. For instance, phage applications have been performed in Europe under the umbrella of Article 37 (Unproven Interventions in Clinical Practice) of the Helsinki Declaration. To enable the application of phage therapy after Poland had joined the EU in 2004, the Ludwik Hirszfeld Institute of Immunology and Experimental Therapy in Wrocław opened its own Phage Therapy Unit (PTU). Phage therapy performed at the PTU is considered an "Experimental Treatment", covered by the adapted Act of 5 December 1996 on the Medical Profession (Polish Law Gazette, 2011, No. 277 item 1634) and Article 37 of the Declaration of Helsinki.[128] Similarly, in the last few years, a number of phage therapy interventions have been performed in the US under the FDA's emergency Investigational New Drug (eIND) protocol.[129]

Some patients have been treated with phages under the umbrella of "compassionate use", which is a treatment option that allows a physician to use a not yet authorized medicine in desperate cases. Under strict conditions, medicines under development can be made available for use in patients for whom no satisfactory authorized therapies are available, and who cannot participate in clinical trials. In principle, this approach can only be applied to products for which earlier study results have demonstrated efficacy and safety, but have not yet been approved. Much like Article 37 of the Helsinki Declaration, the compassionate use treatment option can only be applied when the phages are expected to help in life-threatening or chronic and/or seriously debilitating diseases that are not treatable with formally approved products.

In France, l'Agence Nationale de Sécurité du Médicament et des produits de santé (ANSM), the French medicine agency, has organized a specific committee "Comité Scientifique Spécialisé Temporaire (CSST)" for phage therapy, which consists of experts in various fields. Their task is to evaluate and guide each phage therapy requests that ends up at the ANSM. Phage therapy requests are discussed together with the treating physicians and a consensus advice is sent to the ANSM, which will grant permission or not. Between 2006 and 2018, 15 patients have been treated in France (11 healed) using this pathway.[130]

In Belgium, in 2016 and in response to a number of parliamentary questions, the Minister of Social Affairs and Health acknowledged that it is indeed not evident to treat phages as industrially-made drugs and therefore she proposed to investigate if the magistral preparation pathway could offer a solution.[126] Magistral preparations (compounding pharmacies in the US) are not subjected to certain constraints such as GMP compliance and marketing authorization. As the "magistral preparation framework" was created to allow for adapted patient treatments and/or to use medicines for which there is no commercial interest, it seemed a suitable framework for precision phage therapy concepts. Magistral preparations are medicines prepared in a pharmacy in accordance with a medical prescription for an individual patient. They are made by a pharmacist (or under his/her supervision) from their constituent ingredients, according to the technical and scientific standards of pharmaceutical technology. Phage Active Pharmaceutical Ingredients (APIs) to be included in magistral preparations must meet the requirements of a monograph, which describes their production and quality control testing. They must be accompanied by a certificate of analysis, issued by a "Belgian Approved Laboratory (BAL)", which has been granted an accreditation to perform batch release testing of medicinal products. Since 2019, phages are delivered in the form of magistral preparations to nominal patients in Belgium.

Dozens of patients have been treated thanks to the above-mentioned national solutions. No safety issues were reported and most targeted infections seemed to have been resolved, but the diversity of these "desperate" phage therapy cases, in terms of clinical indications, involved bacterial pathogens, phage products, and treatment and sampling protocols, make it impossible to unambiguously demonstrate that the positive clinical outcomes were due to phages and the lack of control populations.

It is time to find a broader solution to the phage therapy regulatory issues. Medicine agencies, such as the European Medicines Agency (EMA) and the US Food and Drug Administration (FDA) are urged to build on the initiatives that were developed by some national regulatory authorities.[125] Policymakers need to be convinced to open the door for a broad and fast (interim) solution with reduced stringency until the present-day pharmaceutical requirements can be fulfilled, which may require many years.[131] Phage banks containing large amounts of well-characterized (e.g. host range, annotated genome map) and safe phages need to be set up. Physicians must be aware of the existence and content of these banks.

Application in other speciesEdit

Other animalsEdit

Phage therapy has been a relevant mode of treatment in animals for decades.[132] Phage therapy has been proposed as a method of treating bacterial infections in the veterinary medical field in response to the rampant use of antibiotics. Such studies investigated the applications of phage therapy in livestock species as well as companion animals.[133] Brigham Young University has been researching the use of phage therapy to treat American foulbrood in honeybees.[134][135][136] Phage therapy is also being investigated for potential applications in aquaculture.[137]

PlantsEdit

Phage therapy has been heavily studied for bacterial spot of stonefruit, caused by Xanthomonas pruni (syn. X. campestris pv. pruni, syn. X. arboricola pv. pruni) in Prunus.[138][38] Some treatments have been very successful.[138][38]

Cultural impactEdit

The 1925 novel and 1926 Pulitzer prize winner Arrowsmith used phage therapy as a plot point.[139][140][141]

Greg Bear's 2002 novel Vitals features phage therapy, based on Soviet research, used to transfer genetic material.

The 2012 collection of military history essays about the changing role of women in warfare, "Women in War – from home front to front line" includes a chapter featuring phage therapy: "Chapter 17: Women who thawed the Cold War".[142]

Steffanie A. Strathdee's book The Perfect Predator: An Epidemiologist's Journey to Save Her Husband from a Deadly Superbug, co-written with her husband Thomas Patterson, was published by Hachette Book Group in 2019. It describes Dr. Strathdee's ultimately successful attempt to introduce phage therapy as a life-saving treatment for her husband, critically ill with a completely antibiotic-resistant Acinetobacter baumannii infection following severe pancreatitis.

See alsoEdit

ReferencesEdit

  This article was adapted from the following source under a CC BY 4.0 license (2021) (reviewer reports): Joana Azeredo; Jean-Paul Pirnay; Diana Priscila Pires; Mzia Kutateladze; Krystyna Dabrowska; Rob Lavigne; Bob G Blasdel (15 December 2021), "Phage Therapy", WikiJournal of Medicine, WikiJournal of Medicine, 8 (1): 4, doi:10.15347/WJM/2021.004, ISSN 2002-4436, Wikidata Q100400597

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