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Biologics for Targeting Inflammatory Cytokines, Clinical Uses, and Limitations

Peleg Rider, Yaron Carmi, Idan Cohen

International Journal of Cell Biology · 2016 · Review

doi:10.1155/2016/9259646

Abstract

Proinflammatory cytokines are potent mediators of numerous biological processes and are tightly regulated in the body. Chronic uncontrolled levels of such cytokines can initiate and derive many pathologies, including incidences of autoimmunity and cancer. Therefore, therapies that regulate the activity of inflammatory cytokines, either by supplementation of anti-inflammatory recombinant cytokines or by neutralizing them by using blocking antibodies, have been extensively used over the past decades. Over the past few years, new innovative biological agents for blocking and regulating cytokine activities have emerged. Here, we review some of the most recent approaches of cytokine targeting, focusing on anti-TNF antibodies or recombinant TNF decoy receptor, recombinant IL-1 receptor antagonist (IL-1Ra) and anti-IL-1 antibodies, anti-IL-6 receptor antibodies, and TH17 targeting antibodies. We discuss their effects as biologic drugs, as evaluated in numerous clinical trials, and highlight their therapeutic potential as well as emphasize their inherent limitations and clinical risks. We suggest that while systemic blocking of proinflammatory cytokines using biological agents can ameliorate disease pathogenesis and progression, it may also abrogate the hosts defense against infections. Moreover, we outline the rational need to develop new therapies, which block inflammatory cytokines only at sites of inflammation, while enabling their function systemically.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 22, 2026. Paragraph numbers are ours, so an answer can point at one.

1. Introduction

The use of recombinant proteins as biological drugs has been known for the past three decades; however, this field is continuously emerging and in the last decade an increasing number of new biologic entities (biologics) in the area of cytokines were developed. Biologics can be an antibody which neutralizes an inflammatory cytokine or blocks its receptors, decoy receptors targeting the cytokine, or a recombinant protein, which can either be receptor agonist or, alternatively, an antagonist that occupies and prevents receptor binding.

The benefits of cytokines as therapeutic targets are as follows: (i) unlike in chemical drugs, specific protein which mediate the inflammatory process can be inhibited; (ii) cytokines are well studied in animal models using neutralizing antibodies or genetic models like knockout mice; thus the process in which these cytokines are involved can be thoroughly researched; (iii) with the advancement of biotechnology techniques, the expression and isolation of highly purified recombinant proteins becomes a relatively easier and cheaper process than in the past years.

The drawbacks of cytokine therapy come due to the basic properties of cytokines: (i) cytokines are pleiotropic, meaning that they affect several processes in parallel; (ii) cytokines are also known to have redundancy, meaning that the effects achieved by blocking one specific cytokine activity can be compensated by others (although this can be also beneficial, since a biological agent can be replaced to different cytokine blocker when incomplete remission or in case of intolerance); (iii) the cytokine network is a regulated and balanced system and its alteration may lead to impaired immune response. For example, inhibiting proinflammatory cytokines can result in compromised host defense against infections. On the other hand, inhibition of regulatory cytokines can result in autoimmunity or tissue damage; (iv) the production and manufacturing of biologics is still an expensive process, since their production requires sterile conditions (i.e., GMP conditions) and multiple stages of purification; (v) compared to chemical drugs, recombinant cytokines and antibodies have limited shelf half-life, require special/controlled storage conditions, and are typically administrated by a physician.

In this review we discuss some of the key approaches of anticytokine blockers focusing on approved anti-inflammatory biologics. In particular, we highlight their beneficial effects and present their possible side effects and risk factors. Most importantly, we suggest several potential solutions for the anticytokine adverse effects and propose new approaches to this emerging field.

2. Therapeutic Use of Proinflammatory Cytokines

Cytokine therapy emerged from the need to increase immunity against tumors using the lymphocyte activator and proliferative factor, interleukin-2 (IL-2). Based on its remarked efficacy in mice, cancer patients bearing renal cell carcinoma (RCC) and melanoma were administered high doses of IL-2 in order to increase antitumor immunity. Unfortunately, systemic administration of IL-2 has been related to severe toxicity, mainly capillary leak syndrome, associated with edema and hypotension, damage to the kidneys, heart, and brain (as well as tachycardia, atrial fibrillation, fever and chills, muscle and joint pain, and catheter related urinary tract infections). In spite of numerous restrictions and warnings, a recombinant modified version of IL-2 (aldesleukin) was approved in 1992 for metastatic RCC and in 1998 for metastatic melanoma patients.

As early as the 1990s, several years following the discovery of IL-1 by Auron et al., IL-1 was used to treat cancer patients undergoing chemotherapy or patients suffering from anemia. It was assumed that since IL-1 has neutrophilic effects, it could restore neutrophil counts back to normal numbers in neutropenic patients. However, IL-1 is a potent proinflammatory cytokine; thus the treatment resulted in toxicity with side effects such as fever, rigors, fatigue, joint aches, headache, and nausea.

Another example is IFNα, a cytokine involved in the response to viral infections. IFNα in a PEGylated form is given in order to increase antiviral immunity by elevated CD8+ cell response in cases of chronic hepatitis-B virus (HBV) and hepatitis-C virus (HCV) or in the case of immediate treatment for acute HCV. The IFNα can be given alone or together with the nucleoside analog, ribavirin. This treatment facilitates the clearance of the HCV virus and can prevent the chronic disease which can result in cirrhosis and hepatocellular carcinoma. However, this type I IFN cytokine can cause serious adverse effects that can result in limitation of the doses given or even in discontinuation of the treatment. Among these adverse effects are decreased granulocytes and thrombocytes production in the bone-marrow, flu-like symptoms, neuropsychiatric disorders, and autoimmunity syndromes, mainly thyroiditis.

3.1. Anti-TNF-α Biologics

TNF-α is a proinflammatory cytokine; it appears early during the response to trauma or bacterial infections and was first cloned in 1985 by several groups. Initially it was described as a soluble factor with two important abilities, inducing hemorrhagic necrosis of tumors in vivo, combined with the ability to kill tumor cells in vitro. TNF-α is a central alarm cytokine, which is mainly secreted from activated macrophages or dendritic cells in response to ligation of pattern-recognition receptors. Both TNF and IL-1 are attractive therapeutic targets, since they are the upstream factors of the inflammatory cascade. The role of TNF receptor signaling has been correlated with several diseases including rheumatoid arthritis (RA), Crohn's disease, atherosclerosis, psoriasis, sepsis, diabetes, and obesity. TNF-α is expressed as a precursor, anchored to the cell membrane and further cleaved to its soluble form. TNF-α binds the inflammatory TNFR1 and regulatory TNFR2 and in addition to the inflammatory cascade affects cell death, proliferation, and differentiation.

The TNF-α inhibitor etanercept was the first biologic on the market for the treatment of RA. Etanercept is a FC fused recombinant form of a natural TNF inhibitor that was first described in 1988 and later was found to be a soluble TNF receptor. Infliximab is a monoclonal chimeric human-mouse anti-TNF antibody and was approved by the FDA together with etanercept in 1998. Later on, by 2002, a fully human monoclonal antibody against TNF-α (adalimumab) was approved as well. Etanercept and anti-TNF antibodies carry differences in their abilities to bind TNF. While infliximab binds both monomeric and trimeric forms of TNF (the inactive and active forms), etanercept binds mainly the active trimeric form in a less stable manner, as well as binding TNF-β. The anti-TNF antibodies are capable of lysing cells they bind by recruiting the complement system. These differences appear in the molecules effectiveness against different inflammatory diseases and might be related to the antibodies binding to membranal TNF-α on T cells. Infliximab was first approved for the treatment of severe Crohn's disease and later also for RA, where etanercept was first approved only for the treatment of RA. Infliximab was further approved for ulcerative colitis, psoriatic arthritis, ankylosing spondylitis, and chronic plaque psoriasis, and etanercept was further approved for psoriatic arthritis, ankylosing spondylitis, chronic plaque psoriasis, and juvenile idiopathic arthritis in children. Adalimumab is approved for rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, Crohn's disease, ulcerative colitis, moderate-to-severe chronic psoriasis, moderate-to-severe hidradenitis suppurativa, juvenile idiopathic arthritis, and noninfectious uveitis. These days, certolizumab and golimumab are the newer, less studied anti-TNF-α antibodies most recently approved by the FDA for the treatment of RA, psoriatic arthritis, ankylosing spondylitis, Crohn's disease unresponsive to regular medications (certolizumab), and ulcerative colitis (golimumab).

Although the TNF inhibitors were shown effective for the treatment of skin and joint inflammation, they carry the risk of several adverse effects, mainly concerning infections. TNF-α is a fundamental factor for fighting intracellular bacteria and is therefore not surprising that TNF-α inhibition was shown to increase the risk for reactivation of tuberculosis. In a 3-year French study of 69 newly diagnosed tuberculosis patients undergoing anti-TNF therapy, it was concluded that anti-TNF antibodies (infliximab and adalimumab) have a high risk for tuberculosis. Etanercept, the soluble TNF receptor, also carries such a risk but at a lower level. It can be assumed that the differences in the anti-TNF strategies, which allow antibodies to be more effective against IBD, affect also the ability to inhibit the immune system to fight tuberculosis. Similarly, reactivation of HBV is higher during TNF inhibition. Additionally, RA patients who were treated with anti-TNF antibodies experienced a higher rate of outbreaks of herpes zoster virus (HZV) compared to etanercept or disease-modifying antirheumatic drug (DMARD) treatments. Blocking TNF plays an opposing role regarding the development of malignancies. On the one hand, TNF is an inflammatory mediator and the inflammatory process itself can lead to cancerous diseases; hence, inhibiting TNF, like other proinflammatory molecules, can be beneficial in the aspect of cancer initiation and progression. On the other hand, TNF plays a role in cell proliferation, differentiation, and apoptosis, and, therefore, its inhibition can be a result and indeed was correlated with hematological malignancies, like increased hepatosplenic T cell lymphoma in young IBD patients treated with infliximab. In addition, since TNF inhibitors are immunosuppressive drugs, they carry the risk for development of malignancies. Indeed, TNF inhibitors carry warnings for increased risk of hematological malignancies in children, adolescents, and young adults, primarily treated for ulcerative colitis or Crohn's disease also treated with immunosuppressant (azathioprine and/or mercaptopurine). The fact that TNF inhibitors are often combined with methotrexate which also increases the risk for malignancy and, in addition, the association of diseases treated with TNF inhibitors, for example, IBD or RA, with increased risk for cancer is making the direct link between TNF inhibitors and malignancies harder to determine. TNF inhibition, using infliximab or etanercept, was trialed for the treatment of congestive heart disease and not only were they shown to be inefficient but also increased the chance of hospitalization or death due to heart failure. Patients treated with anti-TNF therapy were also reported for increased risk for demyelinating disorders, like multiple sclerosis, optic neuritis, and acute transverse myelitis; paradoxical psoriasis consisting of severe skin lesions was observed in IBD patients treated with anti-TNF agents. In addition, unlike anti-TNF antibodies, etanercept, which is not effective for the treatment of IBD, was correlated with the development of newly diagnosed ulcerative colitis and Crohn's disease in treated patients.

3.2. Anti-IL-1 Therapy

Following the failure to use IL-1 as a therapeutic agent in order to treat neutropenic patients and the increasing data demonstrating the potency of this cytokine to induce inflammation, it was comprehended that IL-1 inhibition rather than IL-1 administration could be beneficial. Following inflammatory stimuli, like bacterial products, the proinflammatory cytokines, IL-1α and IL-1β, are elevated. However, an additional inhibitory protein that reduces these IL-1 molecules is secreted. The anti-inflammatory mediator was isolated in 1990, and the sequence of the IL-1 receptor antagonist (IL-1Ra) was published. It is a cytokine, which belongs to the IL-1 family with about 40% similarity to IL-1β that binds the same IL-1 receptor type 1 (IL-1R1) albeit occupying it without inducing the signal transduction. The significance of the IL-1Ra as a natural anti-inflammatory cytokine is demonstrated by the genetic loss of function of the IL1RN gene. This results in a lethal systemic inflammatory disease with severe skin and bone involvement, termed deficiency of interleukin-1 receptor antagonist (DIRA).

Anakinra is a recombinant nonglycosylated form of IL-1Ra that was approved in 2001 for the treatment of RA in adult patients that did not respond to other antirheumatoid drugs, like DMARD. Anakinra was shown beneficial for the treatment of RA by reducing symptoms and joint damage; however it is recommended to use when other biologics, like anti-IL-6 or anti-TNF therapies which are preferable, are refractory or contraindicated.

Anakinra competes with IL-1β for the receptor binding. The inflammasome-caspase-1 pathway mediates IL-1β activation and secretion. Mutations in the inflammasome related genes can result in autoinflammatory syndromes due to excess IL-1. Anakinra is therefore approved for the treatment of patients suffering from a form of Cryopyrin-Associated Periodic Syndromes (CAPS) called Neonatal-Onset Multisystem Inflammatory Disease (NOMID). CAPS is a common name for three autoinflammatory syndromes (familial cold autoinflammatory syndrome, Muckle-Wells syndrome, and NOMID), in which dysregulated inflammasome results in IL-1β activation and secretion and a broad inflammation occurs. Since IL-1 is the major mediator of these autoinflammatory diseases, it is obvious why anakinra, which blocks IL-1 activity, is preferable for therapy. Anakinra is also given to other inflammatory or autoinflammatory diseases off-label. Familial Mediterranean Fever (FMF) is a hereditary chronic inflammatory disease which IL-1 plays a major role in, and blocking IL-1 reduces the symptoms. Anakinra was also shown to be effective in the case of nonhereditary chronic systemic inflammatory diseases like the adult-onset Still disease, which involves arthritis, fever, and systemic inflammation or the childhood version—systemic-onset juvenile idiopathic arthritis (SJIA). In addition, there are more common inflammatory diseases like gout, hemodialysis patients, postmyocardial infarction cardiac remodeling, and type 2 diabetes, in which the glycaemia and beta-cell secretory function are improved, in addition to vast types of other inflammatory disorders responding to anakinra (reviewed n).

Anakinra has a short half-life of about 6 h; treatment therefore requires frequent subcutaneous injections and the most common side effect of anakinra is injection site reaction. The short half-life of anakinra allows immediate withdrawal of the treatment if needed. During the administration of anakinra, the immune systems ability to fight infections is reduced. Meta-analysis of four RA trials using anakinra showed increased risk of infections, mainly pneumonia but also osteomyelitis, cellulitis, bursitis, herpes zoster, infected bunion, and gangrene. Gouty arthritis patients treated with anakinra were also in increased risk for infections, mostly by S. aureus. Since IL-1 is a neutrophil attractant and growth factor, the risk for neutropenia in patients treated with anakinra increased as well, and during administration of anakinra neutrophil numbers must be followed. Anakinra is forbidden to patients receiving TNF blockers or patients getting live vaccines. The combination of anakinra together with corticosteroids or other immunosuppressive drugs increases the risk of infections. Combining anakinra with prednisolone was shown to risk RA patient with serious infections of S. aureus, hemolytic streptococci, and E. coli. Patients with a history of tuberculosis are not recommended for anakinra treatment or for those participating in clinical trials, since the chance for reactivation of tuberculosis during administration of anakinra is high.

Rilonacept (also termed IL-1 trap), a dimer of IL-1R and IL-1R accessory protein (IL-1RacP) extracellular chains fused to the Fc fragments of IgG, was trialed and found effective for the treatment of CAPS. Rilonacept was approved as biological drug in 2008, and canakinumab, a monoclonal anti-IL-1β antibody that was also shown beneficial for the treatment of CAPS, was approved in 2009. Like anakinra, both were shown to reduce symptoms in additional inflammatory diseases, such as gout, and canakinumab was also shown to be effective for SJIA. Side effects associated with canakinumab resemble those of anakinra, such as increased risk of infections, neutropenia, and low platelet count; therefore it is not recommended for patients with a high risk for infections. Canakinumab is administered once every four to eight weeks, dependent on disease severity, due to its extended half-life. Nonetheless, withdrawal will not terminate the effects of the drug immediately, like in the case of anakinra. Hyper-IgD syndrome (HIDS) is a genetic autoinflammatory syndrome associated with high IgD blood levels, caused by a mutation in the gene encoding mevalonate kinase (MK). TNFR1-associated periodic syndrome (TRAPS) is caused by intracellular accumulation of misfolded mutated TNFR1 and an elevated IL-1 production. HIDS and TRAPS were shown to respond to anakinra. Canakinumab is currently tested in a phase III trial in colchicine resistant FMF, HIDS/MK deficiency, and TRAPS patients (ClinicalTrials.gov identifier: NCT02059291). In addition, the effect of canakinumab on cardiovascular events and type 2 diabetes is currently held by the Canakinumab Anti-Inflammatory Thrombosis Outcome Study (CANTOS) trial.

3.3. Anti-IL-6

IL-6 is another major proinflammatory cytokine with pleotropic effects on the immune system. IL-6 is the ligand for IL-6 receptor (IL-6R). Following its binding, gp130, a transmembranal glycoprotein forms a homodimer and transmits the signaling. Unlike IL-1R1 or TNFR1, which are ubiquitous, IL-6R is restricted to hepatocytes, monocytes, macrophages, and lymphocytes. Another difference from the IL-1 and TNF cytokines is that the soluble form of IL-6R facilitates and induces the signal rather than serving as an inhibitor. Soluble IL-6R binds IL-6 and this complex further binds membranal gp130, which, unlike IL-6R, is expressed in all cell types. This kind of signaling is termed trans-signaling, a process which allows IL-6 to mediate its response on cells that lack IL-6R; among these are embryonic stem cells, endothelial cells, hematopoietic progenitor cells, osteoclasts, and neuronal cells. The proinflammatory cytokines, IL-1 and TNF-α, were assumed to be responsible for the acute phase response of liver cells in vivo. Nevertheless, when hepatocytes response to stimulation by crude macrophage cytokines was compared to isolated cytokines IL-6, IL-1, and TNF, only IL-6 could induce fully comparable response. Among the many IL-6 effects, it was found that it induces immunologic and metabolic responses. IL-6 can alter the T helper cell phenotype programming; it can stimulate B cells, NK cells, osteoclasts, and cancer cells and is secreted by a variety of cells; among these are lymphocytes, macrophages, endothelial cells, epithelial cells, and fibroblasts; these then play a major role in autoimmune diseases, especially RA, in which increased levels of IL-6 are found in synovial fluid. The myeloma receptor antibody (MRA), a humanized antibody against IL-6R, was first trialed in 2003. It was then demonstrated to decrease serum acute phase protein in RA patients, which were not responsive to DMARD or other immunosuppressive drugs. The MRA antibody was renamed tocilizumab and its efficiency for RA was demonstrated in a large trial consisting of 633 patients. The trial showed reduced disease activity and the FDA approved tocilizumab in 2010 for the treatment of RA patients refractory to TNF inhibitors; additionally it was also shown efficient in another trial for the treatment of SJIA where in 2011 the FDA expanded the use of the antibody to include the treatment of SJIA patients. Unfortunately, together with the benefits of IL-6 inhibition came adverse effects. Data pooled from five clinical trials, two ongoing extension trials, and one clinical pharmacology study summarized the following adverse effects among trial participants: serious infections mainly pneumonia, gastroenteritis, and urinary tract infections, opportunistic infections (such as tuberculosis, candidiasis), gastrointestinal perforation, and anaphylactic reactions. Other side effects were neutropenia and increased lipid levels, which are assumed to induce cardiovascular events. Since IL-6 elevates CRP levels, its inhibition by tocilizumab results in milder elevation of CRP during infections. This can put the patients at risk since it is harder to diagnose an infection in patients undergoing treatment. One of SJIA complications is Macrophage-Activating Syndrome (MAS), a life threatening disease, associated with impaired bone-marrow and liver functions. Tocilizumab treatment does not prevent or worsen MAS; however, it does mask the clinical symptoms, again by reducing the CRP levels, which allow diagnosing the outbreak of this syndrome. Blocking IL-1 with anakinra, on the other hand, was shown to reduce MAS severity in SJIA patients.

Siltuximab is a human-mouse chimeric anti-IL-6 antibody approved in 2014 for HIV-negative and herpes virus-8 negative patients for the treatment of multicentric Castleman's disease, a lymphoproliferative disorder associated with increased IL-6 in the enlarged hyperplastic lymph nodes. Siltuximab was further studied for its beneficial anti-IL-6 effects in other malignancies, like multiple myeloma, myelodysplastic syndrome, prostate cancer, ovarian cancer and lung cancer, and cancer-associated cachexia and anorexia. However, the treatment with siltuximab increases the risk of upper respiratory tract infections and other adverse effects including nausea, fatigue pruritus, increased weight gain, rash, hyperuricemia, thrombocytopenia, dyspnea, leukopenia, and neutropenia.

3.4. Biologics Targeting TH17 Cytokines

Ustekinumab is a human monoclonal antibody against IL-12 and IL-23, which share the same IL-12p40 subunit. The antibody recognition of this cytokine reduces the differentiation of naïve CD4+ T helper cells into effector T cells, TH1, and TH17. Previously termed “IL-23-derived autoreactive CD4 T cells,” TH17 cells were named after IL-17 cytokine (which they produce) and are correlated with autoimmunity disorders including RA, lupus, colitis, and EAE. IL-12 and IL-23 and their associated T helper cells are correlated to psoriasis which is an immune-mediated chronic inflammatory skin disease, and psoriasis patients have an increased risk to develop psoriatic arthritis. Ustekinumab was shown to be more effective compared to etanercept and was approved in 2009 for plaque psoriasis and in 2013 for psoriatic arthritis. However, ustekinumab treated patients are recommended to receive prophylactic treatment due to increased risk of tuberculosis reactivation, as well as the issue of reduced CD4+ lymphocytes during this treatment, that should be taken into account.

Secukinumab is a human anti-IL-17A antibody that was trialed and shown ineffective in clinical trials for the treatment of Crohn's disease, as the treatment aggravated the disease severity in addition to increased adverse effects, like upper respiratory tract infections and local fungal infections. However, much like ustekinumab, IL-17 inhibition using secukinumab reduced symptoms and improved physiological functioning compared to placebo or etanercept in plaque psoriasis and was approved by the FDA in 2015. Secukinumab was also reported for its efficiency for psoriatic arthritis and ankylosing spondylitis and was approved for these indications. In March 2016 an additional monoclonal anti-IL-17 antibody—ixekizumab—was approved for patients with plaque psoriasis. Long-term data from experiences of these antibodies targeting effector helper T cells cytokines is required for further evaluation of the adverse effects and safety of these biologics.

4. Reducing Infections in Anti-Inflammatory Biologics

Anticytokine therapy is a powerful tool to fight autoimmune and autoinflammatory diseases in addition to many other diseases in which the inflammatory process enhances the disease activity. For example, IL-1Ra, anakinra, was shown beneficial in vast types of diseases, among which are autoimmune RA, autoinflammatory diseases like CAPS, hereditary inflammatory FMF, improved beta cells function in type 2 diabetes, remodeling following myocardial infarction, smoldering myeloma, and a variety of other disorders. Other inflammatory mediators like TNF-α and IL-6 have also great potential as targets in anti-inflammatory treatment. However, there is always a major cause for concern when systemically reducing inflammation by biologics that can compromise the patient ability to overcome infections. For example, the ability to reduce the rheumatoid process in patient's joints without inhibiting the neutrophils migration into the lungs in order to fight pneumonia is the objective for new biologics. One strategy to do so is to inject the patient with inactive biologic that would be activated whenever it meets the inflammatory site; the chimeric-IL-1Ra recently published carries such an approach. This molecule is composed of the N-terminal peptide of IL-1β fused to IL-1Ra in its C-terminal side that mimics the structure of the precursor of IL-1β; thus it is expressed as an inactive procytokine. In the inflammatory sites, increased levels of neutrophil serine proteases (like elastase, cathepsin G, or chymotrypsin), macrophages-derived PR3 and caspase-1, or granzymes from NK cells are released from activated or dying cells and these enzymes cleave the N-terminal peptide of IL-1β and release the active free C-terminal cytokine part (Figure 1). For example in the inflamed joint of gouty arthritis patients, IL-1β is active due to the increased activity of neutrophils where the short-lived neutrophils are rich in serine proteases and are released to the site of inflammation. As for the chimeric-IL-1Ra, the active IL-1Ra part is released in the same manner as IL-1β (i.e., an inactive precursor that transforms into an active cytokine due to the inflamed environment). At the same time, the patient's unaffected tissues are spared from the excessive systemic IL-1R1 blockade. Chronic inflammation in the microenvironment of tumors facilitates the tumors mechanisms of invasion and growth. The tumor is surrounded with myeloid cells, rich with inflammatory enzymes and cytokines when IL-1 facilitates tumor growth, angiogenesis, and metastases. It was shown that the inflammatory tumorigenic microenvironment is derived from IL-1β secreted from the myeloid cells around the tumor, and the IL-1α secreted from the tumor cells accompanied with hypoxia, necrosis, or DNA damage. It was therefore why anti-IL-1 therapy was suggested for trials in cancer patients. Recently, it was shown that IL-1α neutralization using a monoclonal antibody would be beneficial in cancer patients in prolonging their survival. Cancer patients are often treated with immunosuppressive and bone-marrow suppressing drugs; therefore, they are exposed to increased risk of infections. Thus, biologics like the chimeric-IL-1Ra that might reduce the inflammatory process in the tumor site without reducing the patient's ability to fight infection is a desirable approach. In order to inhibit cell surface TNF, in a cell-type restricted manner, Efimov et al. constructed bispecific antibody that recognizes both the F4/80 macrophage marker and the membranal TNF-α. In this manner, the antibody favors binding of TNF-α on myeloid cells rather than free TNF-α or T lymphocytes derived TNF-α. The aim was to reduce anti-TNF side effects by blocking macrophage-derived inflammation, while maintaining T cell activity. The authors claim that this antibody can prevent reactivation of latent tuberculosis and reduce anti-TNF liver toxicity.

5. Concluding Remarks

Unregulated levels of cytokines are central mediators of many inflammatory diseases. Targeting these cytokines using recombinant anti-inflammatory cytokines, recombinant soluble receptors, or antibodies against cytokines has demonstrated preferable clinical outcomes in patients with autoimmune diseases, which are refractory to glucocorticoids treatments. However, systemic cytokine blocking suffers from a number of serious limitations. For one, the lack of danger signals, which is crucial for adequate immune cell activation as well as hematopoiesis alterations, common features in all biologics, expose the host to increased risks of infections. In addition, the pleiotropic nature of most cytokines and their necessity to the function of multiple cell types across different organs make it almost impossible to inhibit their signaling cascade in a long-term therapy without severe complications. Therefore, new approaches based on site-restricted biologics, which maintain the cytokine activity in other sites, are highly advised.

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    Seckinger P., Isaaz S., Dayer J.-M. A human inhibitor of tumor necrosis factor α. Journal of Experimental Medicine. 1988;167(4):1511-1516.

    Not in our library10.1084/jem.167.4.1511

  23. 23.

    Seckinger P., Zhang J.-H., Hauptmann B., Dayer J.-M. Characterization of a tumor necrosis factor α (TNF-α) inhibitor: evidence of immunological cross-reactivity with the TNF receptor. Proceedings of the National Academy of Sciences of the United States of America. 1990;87(13):5188-5192.

    Not in our library10.1073/pnas.87.13.5188

  24. 24.

    Engelmann H., Novick D., Wallach D. Two tumor necrosis factor-binding proteins purified from human urine. Evidence for immunological cross-reactivity with cell surface tumor necrosis factor receptors. The Journal of Biological Chemistry. 1990;265(3):1531-1536.

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  25. 25.

    Scallon B., Cai A., Solowski N., et al. Binding and functional comparisons of two types of tumor necrosis factor antagonists. Journal of Pharmacology and Experimental Therapeutics. 2002;301(2):418-426.

    Not in our library10.1124/jpet.301.2.418

  26. 26.

    Mohler K. M., Torrance D. S., Smith C. A., et al. Soluble Tumor Necrosis Factor (TNF) receptors are effective therapeutic agents in lethal endotoxemia and function simultaneously as both TNF carriers and TNF antagonists. The Journal of Immunology. 1993;151(3):1548-1561.

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  27. 27.

    Scallon B. J., Moore M. A., Trinh H., Knight D. M., Ghrayeb J. Chimeric anti-TNF-α monoclonal antibody cA2 binds recombinant transmembrane TNF-α and activates immune effector functions. Cytokine. 1995;7(3):251-259.

    Not in our library10.1006/cyto.1995.0029

  28. 28.

    Atreya R., Zimmer M., Bartsch B., et al. Antibodies against tumor necrosis factor (TNF) induce T-cell apoptosis in patients with inflammatory bowel diseases via TNF receptor 2 and intestinal CD14+ macrophages. Gastroenterology. 2011;141(6):2026-2038.

    Not in our library10.1053/j.gastro.2011.08.032

  29. 29.

    Papoutsaki M., Costanzo A. Treatment of psoriasis and psoriatic arthritis. BioDrugs. 2013;27(supplement 1):3-12.

    Not in our library10.1007/bf03325637

  30. 30.

    Lin P. L., Plessner H. L., Voitenok N. N., Flynn J. L. Tumor necrosis factor and tuberculosis. Journal of Investigative Dermatology Symposium Proceedings. 2007;12(1):22-25.

    Not in our library10.1038/sj.jidsymp.5650027

  31. 31.

    Tubach F., Salmon D., Ravaud P., et al. Risk of tuberculosis is higher with anti-tumor necrosis factor monoclonal antibody therapy than with soluble tumor necrosis factor receptor therapy: the three-year prospective French research axed on tolerance of biotherapies registry. Arthritis and Rheumatism. 2009;60(7):1884-1894.

    Not in our library10.1002/art.24632

  32. 32.

    Vassilopoulos D., Calabrese L. H. Management of rheumatic disease with comorbid HBV or HCV infection. Nature Reviews Rheumatology. 2012;8(6):348-357.

    Not in our library10.1038/nrrheum.2012.63

  33. 33.

    Strangfeld A., Listing J., Herzer P., et al. Risk of herpes zoster in patients with rheumatoid arthritis treated with anti-TNF-α agents. JAMA - Journal of the American Medical Association. 2009;301(7):737-744.

    Not in our library10.1001/jama.2009.146

  34. 34.

    Mantovani A. Molecular pathways linking inflammation and cancer. Current Molecular Medicine. 2010;10(4):369-373.

    Not in our library10.2174/156652410791316968

  35. 35.

    Baud V., Karin M. Signal transduction by tumor necrosis factor and its relatives. Trends in Cell Biology. 2001;11(9):372-377.

    Not in our library10.1016/s0962-8924(01)02064-5

  36. 36.

    Mackey A. C., Green L., Leptak C., Avigan M. Hepatosplenic T cell lymphoma associated with infliximab use in young patients treated for inflammatory bowel disease: update. Journal of Pediatric Gastroenterology and Nutrition. 2009;48(3):386-388.

    Not in our library10.1097/mpg.0b013e3181957a11

  37. 37.

    Wolfe F., Michaud K. Lymphoma in rheumatoid arthritis: the effect of methotrexate and anti-tumor necrosis factor therapy in 18,572 patients. Arthritis & Rheumatism. 2004;50(6):1740-1751.

    Not in our library10.1002/art.20311

  38. 38.

    Bernstein C. N., Blanchard J. F., Kliewer E., Wajda A. Cancer risk in patients with inflammatory bowel disease: a Population-based Study. Cancer. 2001;91(4):854-862.

    Not in our library10.1002/1097-0142(20010215)91:4<854::aid-cncr1073>3.0.co;2-z

  39. 39.

    Thomas E., Brewster D. H., Black R. J., Macfarlane G. J. Risk of malignancy among patients with rheumatic conditions. International Journal of Cancer. 2000;88(3):497-502.

    Not in our library10.1002/1097-0215(20001101)88:3<lt;497::aid-ijc27>3.0.co;2-j

  40. 40.

    Raheel S., Crowson C. S., Wright K., Matteson E. L. Risk of malignant neoplasm in patients with incident rheumatoid arthritis 1980–2007 in relation to a comparator cohort: A Population-Based Study. International Journal of Rheumatology. 2016;2016:6.

    Not in our library10.1155/2016/4609486

  41. 41.

    Baecklund E., Iliadou A., Askling J., et al. Association of chronic inflammation, not its treatment, with increased lymphoma risk in rheumatoid arthritis. Arthritis & Rheumatism. 2006;54(3):692-701.

    Not in our library10.1002/art.21675

  42. 42.

    Chung E. S., Packer M., Lo K. H., Fasanmade A. A., Willerson J. T. Randomized, double-blind, placebo-controlled, pilot trial of infliximab, a chimeric monoclonal antibody to tumor necrosis factor-α, in patients with moderate-to-severe heart failure: results of the anti-TNF therapy against congestive heart failure (ATTACH) trial. Circulation. 2003;107(25):3133-3140.

    Not in our library10.1161/01.cir.0000077913.60364.d2

  43. 43.

    Mann D. L., McMurray J. J. V., Packer M., et al. Targeted anticytokine therapy in patients with chronic heart failure: results of the Randomized Etanercept Worldwide Evaluation (RENEWAL). Circulation. 2004;109(13):1594-1602.

    Not in our library10.1161/01.cir.0000124490.27666.b2

  44. 44.

    Bernatsky S., Renoux C., Suissa S. Demyelinating events in rheumatoid arthritis after drug exposures. Annals of the Rheumatic Diseases. 2010;69(9):1691-1693.

    Not in our library10.1136/ard.2009.111500

  45. 45.

    Kaltsonoudis E., Voulgari P. V., Konitsiotis S., Drosos A. A. Demyelination and other neurological adverse events after anti-TNF therapy. Autoimmunity Reviews. 2014;13(1):54-58.

    Not in our library10.1016/j.autrev.2013.09.002

  46. 46.

    Pugliese D., Guidi L., Ferraro P. M., et al. Paradoxical psoriasis in a large cohort of patients with inflammatory bowel disease receiving treatment with anti-TNF alpha: 5-year follow-up study. Alimentary Pharmacology and Therapeutics. 2015;42(7):880-888.

    Not in our library10.1111/apt.13352

  47. 47.

    O’Toole A., Lucci M., Korzenik J. Inflammatory bowel disease provoked by etanercept: report of 443 possible cases combined from an IBD Referral center and the FDA. Digestive Diseases and Sciences. 2016;61(6):1772-1774.

    Not in our library10.1007/s10620-015-4007-z

  48. 48.

    Dallocchio A., Canioni D., Ruemmele F., et al. Occurrence of inflammatory bowel disease during treatment of juvenile idiopathic arthritis with etanercept: a French retrospective study. Rheumatology. 2010;49(9):1694-1698.

    Not in our library10.1093/rheumatology/keq136

  49. 49.

    Dinarello C. A., Rosenwasser L. J., Wolff S. M. Demonstration of a circulating suppressor factor of thymocyte proliferation during endotoxin fever in humans. Journal of Immunology. 1981;127(6):2517-2519.

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  50. 50.

    Arend W. P., Joslin F. G., Massoni R. J. Effects of immune complexes on production by human monocytes of interleukin 1 or an interleukin 1 inhibitor. Journal of Immunology. 1985;134(6):3868-3875.

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  51. 51.

    Eisenberg S. P., Evans R. J., Arend W. P., et al. Primary structure and functional expression from complementary DNA of a human interleukin-1 receptor antagonist. Nature. 1990;343(6256):341-346.

    Not in our library10.1038/343341a0

  52. 52.

    Aksentijevich I., Masters S. L., Ferguson P. J., et al. An autoinflammatory disease with deficiency of the interleukin-1-receptor antagonist. The New England Journal of Medicine. 2009;360(23):2426-2437.

    Not in our library10.1056/nejmoa0807865

  53. 53.

    Mertens M., Singh J. A. Anakinra for rheumatoid arthritis: a systematic review. Journal of Rheumatology. 2009;36(6):1118-1125.

    Not in our library10.3899/jrheum.090074

  54. 54.

    Furst D. E. Anakinra: review of recombinant human interleukin-I receptor antagonist in the treatment of rheumatoid arthritis. Clinical Therapeutics. 2004;26(12):1960-1975.

    Not in our library10.1016/j.clinthera.2004.12.019

  55. 55.

    Mertens M., Singh J. A. Anakinra for rheumatoid arthritis. Cochrane Database of Systematic Reviews (Online). 2009;(1):p. CD005121.

    Not in our library10.1002/14651858.cd005121.pub3

  56. 56.

    Broderick L., De Nardo D., Franklin B. S., Hoffman H. M., Latz E. The inflammasomes and autoinflammatory syndromes. Annual Review of Pathology: Mechanisms of Disease. 2015;10:395-424.

    Not in our library10.1146/annurev-pathol-012414-040431

  57. 57.

    Hoffman H. M., Rosengren S., Boyle D. L., et al. Prevention of cold-associated acute inflammation in familial cold autoinflammatory syndrome by interleukin-1 receptor antagonist. The Lancet. 2004;364(9447):1779-1785.

    Not in our library10.1016/s0140-6736(04)17401-1

  58. 58.

    Metyas S. K., Hoffman H. M. Anakinra prevents symptoms of familial cold autoinflammatory syndrome and Raynaud's disease. Journal of Rheumatology. 2006;33(10):2085-2087.

    Not in our library

  59. 59.

    Hawkins P. N., Lachmann H. J., Aganna E., McDermott M. F. Spectrum of clinical features in muckle-wells syndrome and response to anakinra. Arthritis and Rheumatism. 2004;50(2):607-612.

    Not in our library10.1002/art.20033

  60. 60.

    Goldbach-Mansky R., Dailey N. J., Canna S. W., et al. Neonatal-onset multisystem inflammatory disease responsive to interleukin-1β inhibition. The New England Journal of Medicine. 2006;355(6):581-592.

    Not in our library10.1056/nejmoa055137

  61. 61.

    Stankovic Stojanovic K., Delmas Y., Torres P. U., et al. Dramatic beneficial effect of interleukin-1 inhibitor treatment in patients with familial Mediterranean fever complicated with amyloidosis and renal failure. Nephrology Dialysis Transplantation. 2012;27(5):1898-1901.

    Not in our library10.1093/ndt/gfr528

  62. 62.

    Meinzer U., Quartier P., Alexandra J.-F., Hentgen V., Retornaz F., Koné-Paut I. Interleukin-1 targeting drugs in familial mediterranean fever: a case series and a review of the literature. Seminars in Arthritis and Rheumatism. 2011;41(2):265-271.

    Not in our library10.1016/j.semarthrit.2010.11.003

  63. 63.

    Laskari K., Tzioufas A. G., Moutsopoulos H. M. Efficacy and long-term follow-up of IL-1R inhibitor anakinra in adults with Still's disease: A Case-series Study. Arthritis Research and Therapy. 2011;13(3, article R91).

    Not in our library10.1186/ar3366

  64. 64.

    Fitzgerald A. A., LeClercq S. A., Yan A., Homik J. E., Dinarello C. A. Rapid responses to anakinra in patients with refractory adult-onset Still's disease. Arthritis & Rheumatism. 2005;52(6):1794-1803.

    Not in our library10.1002/art.21061

  65. 65.

    Pascual V., Allantaz F., Arce E., Punaro M., Banchereau J. Role of interleukin-1 (IL-1) in the pathogenesis of systemic onset juvenile idiopathic arthritis and clinical response to IL-1 blockade. The Journal of Experimental Medicine. 2005;201(9):1479-1486.

    Not in our library10.1084/jem.20050473

  66. 66.

    Ohlsson V., Baildam E., Foster H., et al. Anakinra treatment for systemic onset juvenile idiopathic arthritis (SOJIA). Rheumatology. 2008;47(4):555-556.

    Not in our library10.1093/rheumatology/ken030

  67. 67.

    Quartier P., Allantaz F., Cimaz R., et al. A multicentre, randomised, double-blind, placebo-controlled trial with the interleukin-1 receptor antagonist anakinra in patients with systemic-onset juvenile idiopathic arthritis (ANAJIS trial). Annals of the Rheumatic Diseases. 2011;70(5):747-754.

    Not in our library10.1136/ard.2010.134254

  68. 68.

    Ottaviani S., Moltó A., Ea H.-K., et al. Efficacy of anakinra in gouty arthritis: a retrospective study of 40 cases. Arthritis Research and Therapy. 2013;15(5, article R123).

    Not in our library10.1186/ar4303

  69. 69.

    Hung A. M., Ellis C. D., Shintani A., Booker C., Ikizler T. A. IL-1β receptor antagonist reduces inflammation in hemodialysis patients. Journal of the American Society of Nephrology. 2011;22(3):437-442.

    Not in our library10.1681/asn.2010070760

  70. 70.

    Abbate A., Kontos M. C., Grizzard J. D., et al. Interleukin-1 Blockade With Anakinra to Prevent Adverse Cardiac Remodeling After Acute Myocardial Infarction (Virginia Commonwealth University Anakinra Remodeling Trial [VCU-ART] Pilot Study). American Journal of Cardiology. 2010;105(10):1371-1377.e1.

    Not in our library10.1016/j.amjcard.2009.12.059

  71. 71.

    Larsen C. M., Faulenbach M., Vaag A., et al. Interleukin-1-receptor antagonist in type 2 diabetes mellitus. New England Journal of Medicine. 2007;356(15):1517-1526.

    Not in our library10.1056/nejmoa065213

  72. 72.

    Dinarello C. A., Simon A., van der Meer J. W. M. Treating inflammation by blocking interleukin-1 in a broad spectrum of diseases. Nature Reviews Drug Discovery. 2012;11(8):633-652.

    Not in our library10.1038/nrd3800

  73. 73.

    Jesus A. A., Goldbach-Mansky R. IL-1 blockade in autoinflammatory syndromes. Annual Review of Medicine. 2014;65:223-244.

    Not in our library10.1146/annurev-med-061512-150641

  74. 74.

    Federici S., Martini A., Gattorno M. The central role of anti-IL-1 blockade in the treatment of monogenic and multi-factorial autoinflammatory diseases. Frontiers in Immunology. 2013;4, article 351.

    Not in our library10.3389/fimmu.2013.00351

  75. 75.

    Cavalli G., Dinarello C. A. Treating rheumatological diseases and co-morbidities with interleukin-1 blocking therapies. Rheumatology. 2015;54(12):2134-2144.

    Not in our library10.1093/rheumatology/kev269

  76. 76.

    Settas L. D., Tsimirikas G., Vosvotekas G., Triantafyllidou E., Nicolaides P. Reactivation of pulmonary tuberculosis in a patient with rheumatoid arthritis during treatment with IL-1 receptor antagonists (anakinra). Journal of Clinical Rheumatology. 2007;13(4):219-220.

    Not in our library10.1097/rhu.0b013e31812e00a1

  77. 77.

    Direz G., Noël N., Guyot C., Toupance O., Salmon J.-H., Eschard J.-P. Efficacy but side effects of anakinra therapy for chronic refractory gout in a renal transplant recipient with preterminal chronic renal failure. Joint Bone Spine. 2012;79(6):p. 631.

    Not in our library10.1016/j.jbspin.2012.04.009

  78. 78.

    Perrin F., Néel A., Graveleau J., Ruellan A.-L., Masseau A., Hamidou M. Two cases of anakinra-induced neutropenia during auto-inflammatory diseases: drug reintroduction can be successful. La Presse Médicale. 2014;43(3):319-321.

    Not in our library10.1016/j.lpm.2013.06.028

  79. 79.

    Turesson C., Riesbeck K. Septicemia with Staphylococcus aureus, beta-hemolytic streptococci group B and G, and Escherichia coli in a patient with rheumatoid arthritis treated with a recombinant human interleukin 1 receptor antagonist (Anakinra). Journal of Rheumatology. 2004;31(9):p. 1876.

    Not in our library

  80. 80.

    Hoffman H. M., Throne M. L., Amar N. J., et al. Efficacy and safety of rilonacept (Interleukin-1 Trap) in patients with cryopyrin-associated periodic syndromes: results from two sequential placebo-controlled studies. Arthritis and Rheumatism. 2008;58(8):2443-2452.

    Not in our library10.1002/art.23687

  81. 81.

    Walsh G. M. Canakinumab for the treatment of cryopyrin-associated periodic syndromes. Drugs of Today. 2009;45(10):731-735.

    Not in our library10.1396674/dot.2009.45.10.1416583

  82. 82.

    Savic S., McDermott M. F. Inflammation: canakinumab for the cryopyrin-associated periodic syndromes. Nature Reviews Rheumatology. 2009;5(10):529-530.

    Not in our library10.1038/nrrheum.2009.195

  83. 83.

    Lachmann H. J., Kone-Paut I., Kuemmerle-Deschner J. B., et al. Use of canakinumab in the cryopyrin-associated periodic syndrome. The New England Journal of Medicine. 2009;360(23):2416-2425.

    Not in our library10.1056/nejmoa0810787

  84. 84.

    Church L. D., McDermott M. F. Canakinumab, a fully-human mAb against IL-1β for the potential treatment of inflammatory disorders. Current Opinion in Molecular Therapeutics. 2009;11(1):81-89.

    Not in our library

  85. 85.

    Kuemmerle-Deschner J. B., Ramos E., Blank N., et al. Canakinumab (ACZ885, a fully human IgG1 anti-IL-1β mAb) induces sustained remission in pediatric patients with cryopyrin-associated periodic syndrome (CAPS). Arthritis Research & Therapy. 2011;13(1, article R34).

    Not in our library10.1186/ar3266

  86. 86.

    Koné-Paut I., Lachmann H. J., Kuemmerle-Deschner J. B., et al. Sustained remission of symptoms and improved health-related quality of life in patients with cryopyrin-associated periodic syndrome treated with canakinumab: results of a double-blind placebo-controlled randomized withdrawal study. Arthritis Research & Therapy. 2011;13(6):p. R202.

    Not in our library10.1186/ar3535

  87. 87.
  88. 88.

    Schumacher H. R., Evans R. R., Saag K. G., et al. Rilonacept (interleukin-1 trap) for prevention of gout flares during initiation of uric acid-lowering therapy: results from a phase III randomized, double-blind, placebo-controlled, confirmatory efficacy study. Arthritis Care & Research. 2012;64(10):1462-1470.

    Not in our library10.1002/acr.21690

  89. 89.

    Ruperto N., Brunner H. I., Quartier P., et al. Two randomized trials of canakinumab in systemic juvenile idiopathic arthritis. The New England Journal of Medicine. 2012;367(25):2396-2406.

    Not in our library10.1056/nejmoa1205099

  90. 90.

    Schlesinger N., Alten R. E., Bardin T., et al. Canakinumab for acute gouty arthritis in patients with limited treatment options: results from two randomised, multicentre, active-controlled, double-blind trials and their initial extensions. Annals of the Rheumatic Diseases. 2012;71(11):1839-1848.

    Not in our library10.1136/annrheumdis-2011-200908

  91. 91.

    Stoffels M., Simon A. Hyper-IgD syndrome or mevalonate kinase deficiency. Current Opinion in Rheumatology. 2011;23(5):419-423.

    Not in our library10.1097/bor.0b013e328349c3b1

  92. 92.

    Kimberley F. C., Lobito A. A., Siegel R. M., Screaton G. R. Falling into TRAPS—receptor misfolding in the TNF receptor 1-associated periodic fever syndrome. Arthritis Research and Therapy. 2007;9(4, article 217).

    Not in our library10.1186/ar2197

  93. 93.

    Peciuliene S., Burnyte B., Gudaitiene R., et al. Perinatal manifestation of mevalonate kinase deficiency and efficacy of anakinra. Pediatric Rheumatology. 2016;14(1):p. 19.

    Not in our library10.1186/s12969-016-0081-9

  94. 94.

    Campanilho-Marques R., Brogan P. A. Mevalonate kinase deficiency in two sisters with therapeutic response to anakinra: case report and review of the literature. Clinical Rheumatology. 2014;33(11):1681-1684.

    Not in our library10.1007/s10067-014-2523-4

  95. 95.

    Bodar E. J., Kuijk L. M., Drenth J. P. H., Van Der Meer J. W. M., Simon A., Frenkel J. On-demand anakinra treatment is effective in mevalonate kinase deficiency. Annals of the Rheumatic Diseases. 2011;70(12):2155-2158.

    Not in our library10.1136/ard.2011.149922

  96. 96.

    Lequerré T., Vittecoq O., Pouplin S., et al. Mevalonate kinase deficiency syndrome with structural damage responsive to anakinra. Rheumatology. 2007;46(12):1860-1862.

    Not in our library10.1093/rheumatology/kem258

  97. 97.

    Grimwood C., Despert V., Jeru I., Hentgen V. On-demand treatment with anakinra: a treatment option for selected TRAPS patients. Rheumatology. 2015;54(9):1749-1751.

    Not in our library10.1093/rheumatology/kev111

  98. 98.

    Cattalini M., Meini A., Monari P., et al. Recurrent migratory angioedema as cutaneous manifestation in a familiar case of TRAPS: dramatic response to Anakinra. Dermatology Online Journal. 2013;19(11).

    Not in our library

  99. 99.

    Andrés M., Pascual E. Anakinra for a refractory case of intermittent hydrarthrosis with a TRAPS-related gene mutation. Annals of the Rheumatic Diseases. 2013;72(1):p. 155.

    Not in our library10.1136/annrheumdis-2012-202087

  100. 100.

    Obici L., Meini A., Cattalini M., et al. Favourable and sustained response to anakinra in tumour necrosis factor receptor-associated periodic syndrome (TRAPS) with or without AA amyloidosis. Annals of the Rheumatic Diseases. 2011;70(8):1511-1512.

    Not in our library10.1136/ard.2010.143438

  101. 101.

    Ridker P. M., Thuren T., Zalewski A., Libby P. Interleukin-1β inhibition and the prevention of recurrent cardiovascular events: Rationale and Design of the Canakinumab Anti-inflammatory Thrombosis Outcomes Study (CANTOS). American Heart Journal. 2011;162(4):597-605.

    Not in our library10.1016/j.ahj.2011.06.012

  102. 102.

    Rose-John S. Interleukin-6 biology is coordinated by membrane bound and soluble receptors. Acta Biochimica Polonica. 2003;50(3):603-611.

    Not in our library

  103. 103.

    Regulation of the acute phase and immune responses: interleukin-6. Annals of the New York Academy of Sciences. 1989;557:1-583.

    Not in our library

  104. 104.

    Baranovski B. M., Freixo-Lima G. S., Lewis E. C., Rider P. T helper subsets, peripheral plasticity, and the acute phase protein, α1-antitrypsin. BioMed Research International. 2015;2015:14.

    Not in our library10.1155/2015/184574

  105. 105.

    Keller E. T., Wanagat J., Ershler W. B. Molecular and cellular biology of interleukin-6 and its receptor. Frontiers in Bioscience. 1996;1:d340-d357.

    Not in our library10.2741/a136

  106. 106.

    Houssiau F. A., Devogelaer J.-P., van Damme J., Deuxchaisnes C. N., van Snick J. Interleukin-6 in synovial fluid and serum of patients with rheumatoid arthritis and other inflammatory arthritides. Arthritis & Rheumatology. 1988;31(6):784-788.

    Not in our library10.1002/art.1780310614

  107. 107.

    Nishimoto N., Yoshizaki K., Maeda K., et al. Toxicity, pharmacokinetics, and dose-finding study of repetitive treatment with the humanized anti-interleukin 6 receptor antibody MRA in rheumatoid arthritis. Phase I/II Clinical Study. Journal of Rheumatology. 2003;30(7):1426-1435.

    Not in our library

  108. 108.

    Smolen J. S., Beaulieu A., Rubbert-Roth A., et al. Effect of interleukin-6 receptor inhibition with tocilizumab in patients with rheumatoid arthritis (OPTION study): a double-blind, placebo-controlled, randomised trial. The Lancet. 2008;371(9617):987-997.

    Not in our library10.1016/s0140-6736(08)60453-5

  109. 109.

    Yokota S., Imagawa T., Mori M., et al. Efficacy and safety of tocilizumab in patients with systemic-onset juvenile idiopathic arthritis: a randomised, double-blind, placebo-controlled, withdrawal phase III trial. The Lancet. 2008;371(9617):998-1006.

    Not in our library10.1016/s0140-6736(08)60454-7

  110. 110.
  111. 111.

    Lang V. R., Englbrecht M., Rech J., et al. Risk of infections in rheumatoid arthritis patients treated with tocilizumab. Rheumatology. 2012;51(5):852-857.

    Not in our library10.1093/rheumatology/ker223

  112. 112.

    Yokota S., Itoh Y., Morio T., Sumitomo N., Daimaru K., Minota S. Macrophage activation syndrome in patients with systemic juvenile idiopathic arthritis under treatment with tocilizumab. Journal of Rheumatology. 2015;42(4):712-722.

    Not in our library10.3899/jrheum.140288

  113. 113.

    Shimizu M., Nakagishi Y., Kasai K., et al. Tocilizumab masks the clinical symptoms of systemic juvenile idiopathic arthritis-associated macrophage activation syndrome: the diagnostic significance of interleukin-18 and interleukin-6. Cytokine. 2012;58(2):287-294.

    Not in our library10.1016/j.cyto.2012.02.006

  114. 114.

    Durand M., Troyanov Y., Laflamme P., Gregoire G. Macrophage activation syndrome treated with anakinra. Journal of Rheumatology. 2010;37(4):879-880.

    Not in our library10.3899/jrheum.091046

  115. 115.

    Kelly A., Ramanan A. V. A case of macrophage activation syndrome successfully treated with anakinra. Nature Clinical Practice Rheumatology. 2008;4(11):615-620.

    Not in our library10.1038/ncprheum0919

  116. 116.

    Bruck N., Suttorp M., Kabus M., Heubner G., Gahr M., Pessler F. Rapid and sustained remission of systemic juvenile idiopathic arthritis-associated macrophage activation syndrome through treatment with anakinra and corticosteroids. Journal of Clinical Rheumatology. 2011;17(1):23-27.

    Not in our library10.1097/rhu.0b013e318205092d

  117. 117.

    El-Osta H. E., Kurzrock R. Castleman's disease: from basic mechanisms to molecular therapeutics. Oncologist. 2011;16(4):497-511.

    Not in our library10.1634/theoncologist.2010-0212

  118. 118.

    Markham A., Patel T. Siltuximab: first global approval. Drugs. 2014;74(10):1147-1152.

    Not in our library10.1007/s40265-014-0249-x

  119. 119.

    Bagcchi S. Siltuximab in transplant-ineligible patients with myeloma. The Lancet Oncology. 2014;15(8, article e309).

    Not in our library10.1016/s1470-2045(14)70226-8

  120. 120.

    Stone R. L., Nick A. M., McNeish I. A., et al. Paraneoplastic thrombocytosis in ovarian cancer. New England Journal of Medicine. 2012;366(7):610-618.

    Not in our library10.1056/nejmoa1110352

  121. 121.

    Cavarretta I. T., Neuwirt H., Zaki M. H., et al. Mcl-1 is regulated by IL-6 and mediates the survival activity of the cytokine in a model of late stage prostate carcinoma. Advances in Experimental Medicine and Biology. 2008;617:547-555.

    Not in our library10.1007/978-0-387-69080-3_56

  122. 122.

    Song L., Smith M. A., Doshi P., et al. Antitumor efficacy of the anti-interleukin-6 (IL-6) antibody siltuximab in mouse xenograft models of lung cancer. Journal of Thoracic Oncology. 2014;9(7):974-982.

    Not in our library10.1097/jto.0000000000000193

  123. 123.

    Deisseroth A., Ko C.-W., Nie L., et al. FDA approval: siltuximab for the treatment of patients with multicentric castleman disease. Clinical Cancer Research. 2015;21(5):950-954.

    Not in our library10.1158/1078-0432.ccr-14-1678

  124. 124.

    Thomas S. K., Suvorov A., Noens L., et al. Evaluation of the QTc prolongation potential of a monoclonal antibody, siltuximab, in patients with monoclonal gammopathy of undetermined significance, smoldering multiple myeloma, or low-volume multiple myeloma. Cancer Chemotherapy and Pharmacology. 2014;73(1):35-42.

    Not in our library10.1007/s00280-013-2314-7

  125. 125.

    Langrish C. L., Chen Y., Blumenschein W. M., et al. IL-23 drives a pathogenic T cell population that induces autoimmune inflammation. The Journal of Experimental Medicine. 2005;201(2):233-240.

    Not in our library10.1084/jem.20041257

  126. 126.

    Fujino S., Andoh A., Bamba S., et al. Increased expression of interleukin 17 in inflammatory bowel disease. Gut. 2003;52(1):65-70.

    Not in our library10.1136/gut.52.1.65

  127. 127.

    Koutruba N., Emer J., Lebwohl M. Review of ustekinumab, an interleukin-12 and interleukin-23 inhibitor used for the treatment of plaque psoriasis. Therapeutics and Clinical Risk Management. 2010;6:123-141.

    Not in our library10.2147/tcrm.s5599

  128. 128.

    Griffiths C. E. M., Strober B. E., Van De Kerkhof P., et al. Comparison of ustekinumab and etanercept for moderate-to-severe psoriasis. New England Journal of Medicine. 2010;362(2):118-128.

    Not in our library10.1056/nejmoa0810652

  129. 129.

    Tsai T.-F., Ho V., Song M., et al. The safety of ustekinumab treatment in patients with moderate-to-severe psoriasis and latent tuberculosis infection. British Journal of Dermatology. 2012;167(5):1145-1152.

    Not in our library10.1111/j.1365-2133.2012.11142.x

  130. 130.

    Kauffman C. L., Aria N., Toichi E., et al. A phase I study evaluating the safety, pharmacokinetics, and clinical response of a human IL-12 p40 antibody in subjects with plaque psoriasis. Journal of Investigative Dermatology. 2004;123(6):1037-1044.

    Not in our library10.1111/j.0022-202x.2004.23448.x

  131. 131.

    Gottlieb A. B., Cooper K. D., McCormick T. S., et al. A phase 1, double-blind, placebo-controlled study evaluating single subcutaneous administrations of a human interleukin-12/23 monoclonal antibody in subjects with plaque psoriasis. Current Medical Research and Opinion. 2007;23(5):1081-1092.

    Not in our library10.1185/030079907x182112

  132. 132.

    Hueber W., Sands B. E., Lewitzky S., et al. Secukinumab, a human anti-IL-17A monoclonal antibody, for moderate to severe Crohn's disease: unexpected results of a randomised, double-blind placebo-controlled trial. Gut. 2012;61(12):1693-1700.

    Not in our library10.1136/gutjnl-2011-301668

  133. 133.

    Gottlieb A. B., Langley R. G., Philipp S., et al. Secukinumab improves physical function in subjects with plaque psoriasis and psoriatic arthritis: results from two randomized, phase 3 trials. Journal of Drugs in Dermatology. 2015;14(8):821-833.

    Not in our library

  134. 134.

    Baeten D., Sieper J., Braun J., et al. Secukinumab, an interleukin-17A inhibitor, in ankylosing spondylitis. The New England Journal of Medicine. 2015;373(26):2534-2548.

    Not in our library10.1056/nejmoa1505066

  135. 135.

    Leonardi C., Matheson R., Zachariae C., et al. Anti-interleukin-17 monoclonal antibody ixekizumab in chronic plaque psoriasis. New England Journal of Medicine. 2012;366(13):1190-1191.

    Not in our library10.1056/nejmoa1109997

  136. 136.

    Ren V., Dao H. Potential role of ixekizumab in the treatment of moderate-to-severe plaque psoriasis. Clinical, Cosmetic and Investigational Dermatology. 2013;6:75-80.

    Not in our library10.2147/ccid.s42424

  137. 137.

    Lust J. A., Lacy M. Q., Zeldenrust S. R., et al. Induction of a chronic disease state in patients with smoldering or indolent multiple myeloma by targeting interleukin 1β-induced interleukin 6 production and the myeloma proliferative component. Mayo Clinic Proceedings. 2009;84(2):114-122.

    Not in our library10.4065/84.2.114

  138. 138.

    Rider P., Carmi Y., Yossef R., et al. IL-1 receptor antagonist chimeric protein: context-specific and inflammation-restricted activation. The Journal of Immunology. 2015;195(4):1705-1712.

    Not in our library10.4049/jimmunol.1501168

  139. 139.

    Netea M. G., Van De Veerdonk F. L., Van Der Meer J. W. M., Dinarello C. A., Joosten L. A. B. Inflammasome-independent regulation of IL-1-family cytokines. Annual Review of Immunology. 2015;33:49-77.

    Not in our library10.1146/annurev-immunol-032414-112306

  140. 140.

    Joosten L. A. B., Netea M. G., Fantuzzi G., et al. Inflammatory arthritis in caspase 1 gene-deficient mice: contribution of proteinase 3 to caspase 1-independent production of bioactive interleukin-1β. Arthritis and Rheumatism. 2009;60(12):3651-3662.

    Not in our library10.1002/art.25006

  141. 141.

    van de Veerdonk F. L., Netea M. G., Dinarello C. A., Joosten L. A. B. Inflammasome activation and IL-1β and IL-18 processing during infection. Trends in Immunology. 2011;32(3):110-116.

    Not in our library10.1016/j.it.2011.01.003

  142. 142.

    Irmler M., Hertig S., MacDonald H. R., et al. Granzyme A is an interleukin 1β-converting enzyme. Journal of Experimental Medicine. 1995;181(5):1917-1922.

    Not in our library10.1084/jem.181.5.1917

  143. 143.

    Mantovani A. Cancer: inflammation by remote control. Nature. 2005;435(7043):752-753.

    Not in our library10.1038/435752a

  144. 144.

    Carmi Y., Voronov E., Dotan S., et al. The role of macrophage-derived IL-1 in induction and maintenance of angiogenesis. The Journal of Immunology. 2009;183(7):4705-4714.

    Not in our library10.4049/jimmunol.0901511

  145. 145.

    Carmi Y., Dotan S., Rider P., et al. The role of IL-1β in the early tumor cell-induced angiogenic response. Journal of Immunology. 2013;190(7):3500-3509.

    Not in our library10.4049/jimmunol.1202769

  146. 146.

    Cohen I., Rider P., Carmi Y., et al. Differential release of chromatin-bound IL-1α discriminates between necrotic and apoptotic cell death by the ability to induce sterile inflammation. Proceedings of the National Academy of Sciences of the United States of America. 2010;107(6):2574-2579.

    Not in our library10.1073/pnas.0915018107

  147. 147.

    Cohen I., Rider P., Vornov E., et al. Corrigendum: IL-1α is a DNA damage sensor linking genotoxic stress signaling to sterile inflammation and innate immunity. Scientific Reports. 2016;6.

    Not in our library10.1038/srep19100

  148. 148.

    Rider P., Carmi Y., Guttman O., et al. IL-1α and IL-1β recruit different myeloid cells and promote different stages of sterile inflammation. Journal of Immunology. 2011;187(9):4835-4843.

    Not in our library10.4049/jimmunol.1102048

  149. 149.

    Rider P., Kaplanov I., Romzova M., et al. The transcription of the alarmin cytokine interleukin-1 alpha is controlled by hypoxia inducible factors 1 and 2 alpha in hypoxic cells. Frontiers in Immunology. 2012;3, article 290.

    Not in our library10.3389/fimmu.2012.00290

  150. 150.

    Dinarello C. A. Why not treat human cancer with interleukin-1 blockade? Cancer and Metastasis Reviews. 2010;29(2):317-329.

    Not in our library10.1007/s10555-010-9229-0

  151. 151.

    Dinarello C. A. An expanding role for interleukin-1 blockade from gout to cancer. Molecular Medicine. 2014;20, supplement 1:S43-S58.

    Not in our library10.2119/molmed.2014.00232

  152. 152.

    Dinarello C. A. Interleukin-1α neutralisation in patients with cancer. The Lancet Oncology. 2014;15(6):552-553.

    Not in our library10.1016/s1470-2045(14)70164-0

  153. 153.

    Hong D. S., Hui D., Bruera E., et al. MABp1, a first-in-class true human antibody targeting interleukin-1α in refractory cancers: an open-label, phase 1 dose-escalation and expansion study. The Lancet Oncology. 2014;15(6):656-666.

    Not in our library10.1016/s1470-2045(14)70155-x

  154. 154.

    Efimov G. A., Kruglov A. A., Khlopchatnikova Z. V., et al. Cell-type-restricted anti-cytokine therapy: TNF inhibition from one pathogenic source. Proceedings of the National Academy of Sciences of the United States of America. 2016;113(11):3006-3011.

    Not in our library10.1073/pnas.1520175113

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