Omalizumab treatment for chronic spontaneous urticaria: data from Turkey

Aim

The aim of the study was to investigate data from patients suffering from chronic spontaneous urticaria refractory to conventional therapy, and to document outcomes of omalizumab use.

Material and methods

We conducted a single-centre retrospective study with 175 chronic spontaneous urticaria patients who were treated with 300 mg omalizumab subcutaneously every 4 weeks for at least 6 months. Efficacy, factors affecting outcome, and complications were examined.

Results

The complete response rate was 70.9%. Minor complications were observed in 12% of our patients. Anaphylaxis occurred in 1 patient as a major complication. We did not notice any clinical or laboratory factors predicting response to omalizumab treatment.

Conclusions

The findings show that omalizumab is effective and safe for the treatment of chronic spontaneous urticaria with a dosing of 300 mg/month subcutaneously. However, due to 1 case of anaphylaxis in this small group, we must still remind practitioners to be alert for this possible complication.

Case Report: Omalizumab Successfully Treated Recalcitrant Bullous Pemphigoid in an Elderly Patient with Multiple Comorbidities

Bullous pemphigoid (BP) is an autoimmune blistering disease mainly affecting elderly individuals. Comorbidities are common in patients with BP and have been found to complicate the management and prognosis. We describe a patient with multiple comorbidities who was successfully treated with omalizumab and suggest omalizumab as a good alternative therapy for BP to prevent treatment-related complications in elderly patients with a poor general condition.

Severe non-atopic asthma: omalizumab can reduce severe asthma exacerbations

Introduction: Humanized monoclonal anti-IgE antibody (omalizumab) has demonstrated efficacy in severe atopic asthma. However, few studies have assessed its efficacy in non-atopic and even less in T2-low severe asthma. The objective was to determinate the omalizumab response according to atopic status.Methods: This retrospective, real-world study was performed in the Chest Diseases Department of Strasbourg University Hospital from January 1, 2006, to June 30, 2017. The response to omalizumab was assessed in 139 patients 4, 6, and 12 months after treatment and compared to data collected prior to omalizumab initiation.Results: Forty-four patients (31.7%) had severe non-atopic asthma and 95 (68.3%) had a severe atopic asthma. In the non-atopic group, omalizumab significantly reduced the severe exacerbation rate by 44% (95% CI 18-64%, p < 0.05), 43% (CI 95% 20-60%, p < 0.05), and 54% (CI 95% 36-67%, p < 0.05), at 4, 6 and 12 months, respectively. A trend toward improvement in FEV1, asthma control and oral corticosteroid use was also observed. These results were not significantly different from those obtained in atopic asthmatics except a more effective oral corticosteroid sparing in atopic group (p < 0.05). Similar reduction of severe exacerbation rates were observed in T2-low asthma subgroup (non-atopic, non-eosinophilic).Conclusion: Omalizumab was effective in severe asthma, regardless of atopic status.

Efficacy and Safety of Dupilumab Versus Omalizumab in Chronic Rhinosinusitis With Nasal Polyps and Asthma: EVEREST Trial Design

BACKGROUND

Chronic rhinosinusitis with nasal polyps (CRSwNP) and asthma are chronic type 2 inflammatory diseases that are frequently associated with each other. Dupilumab inhibits the dual signaling pathways of interleukin (IL)-4 and IL-13, which are key and central drivers of type 2 inflammation in CRSwNP. Omalizumab blocks the action of immunoglobulin E. Head-to-head studies are required to investigate the comparative efficacy and safety of these interventions. EVEREST (EValuating trEatment RESponses of dupilumab vs omalizumab in Type 2 patients) trial is designed to evaluate whether the efficacy of dupilumab is superior to omalizumab in treating patients with CRSwNP and comorbid asthma (ClinicalTrials.gov Identifiers: NCT04998604).

OBJECTIVE

Here, we describe the EVEREST study design to compare the efficacy and safety of dupilumab compared to omalizumab over 24 weeks of treatment in patients with severe CRSwNP and comorbid asthma.

METHODS

EVEREST is a global, phase 4 multicenter, randomized (1:1), double-blind, active-controlled trial. Approximately 422 adult patients with severe CRSwNP, symptoms of nasal congestion and loss of smell, and coexisting asthma will be recruited across 15 countries. The primary objective is to assess the efficacy of dupilumab compared to omalizumab in reducing the nasal polyp size and improving the sense of smell. The key secondary objectives are to evaluate the comparative efficacy in improving CRSwNP symptoms (eg, nasal congestion) and lung function. The safety will be evaluated in terms of treatment-emergent adverse events (AEs), serious AEs, and AEs of special interest.

CONCLUSIONS

EVEREST is the first head-to-head trial assessing the comparative efficacy and safety of 2 biologics in patients with severe CRSwNP and comorbid asthma. The study will provide evidence to help optimize treatment plans for patients that suffer from severe CRSwNP and comorbid asthma.

Trends in the Cost and Utilization of Omalizumab in the Medicare Population: 2013-2017

Background: Omalizumab has been demonstrated to be effective in treating chronic spontaneous urticaria (CSU) and was FDA approved for this indication in 2014. Previous work has shown that access to injectable biologics varies across US counties. In the present study we evaluate geographic and temporal trends in the utilization of omalizumab in the Medicare population by dermatologists, with its use by allergists and pulmonologists as comparators. Methods: We analyzed year-over-year trends in omalizumab utilization across geographic regions using the Medicare Provider Utilization and Payment Data: Part D files. Results: Utilization of omalizumab by dermatologists increased rapidly after its FDA approval, from 0.08 claims/100,000 enrollees totaling $209/100,000 enrollees in 2014 to 1.45 claims/100,000 enrollees totaling $3115/100,000 enrollees in 2017. Nonetheless, prescribing dermatologists were present in only 2.8% (95% Confidence Interval (CI): 2.0%-3.9%) and 0.2% (95% CI: 0.0%-0.5%) of metropolitan and non-metropolitan counties, respectively, in 2017, demonstrating limited availability, especially in non-metropolitan counties. Similarly, prescribers of any specialty were available in 32.9% (95% CI: 30.2%-35.6%) and 3.8% (95% CI: 3.1%-4.8%) of metropolitan and non-metropolitan counties, respectively, in 2017. Conclusions: Our data suggest that despite increasing omalizumab utilization, there remains a lack of access across many counties, particularly in non-metropolitan regions. Efforts to expand omalizumab prescriber accessibility in these counties may improve outcomes for patients with CSU.

Biologics in severe asthma: Outcomes in clinical trials-Similarities and differences

INTRODUCTION

Severe asthma is a heterogenous disease characterized by multiple phenotypes. Targeted biologic therapies have revolutionarily changed the management of severe asthma by affecting various clinical outcomes, mainly by reducing exacerbations and the use of maintenance corticosteroids, but also by improving lung function and patient quality of life.

AREAS COVERED

Randomized controlled trials have convincingly demonstrated the efficacy of different biologics in improving the above outcomes. However, no head-to-head studies exist to compare their efficacy and many patients with severe asthma are eligible for more than one biologic agent. In this review, we present the effect of various biologics in the various outcomes as shown in randomized controlled trials and discuss their similarities and differences.

EXPERT OPINION

Both the initial choice of a biologic as well as the option of switching to another give the clinician an interesting but also difficult decision when choosing a biologic therapy for patients with severe asthma. This decision is mainly based on the individual characteristics of the patient, especially rate of exacerbations and use of systemic corticosteroids, but is also influenced by the presence of comorbidities and lung function impairment. No safety concerns have been raised around the use of these biologics.

Current and Future Approaches in Management of Chronic Spontaneous Urticaria Using Anti-IgE Antibodies

Chronic spontaneous urticaria (CSU) considerably alters patients’ quality of life, often for extended periods, due to pruriginous skin lesions, impaired sleep, unexpected development of angioedema, and failure of conventional treatments in properly controlling signs and symptoms. Recent research focused on the development of new therapeutic agents with higher efficacy. Although the production of specific immunoglobulin E (IgE) antibodies against certain allergens is not a characteristic of the disease, treatment with omalizumab, a monoclonal anti-IgE antibody, proved efficient and safe in patients with moderate to severe chronic spontaneous urticaria uncontrolled by H1-antihistamines. Ligelizumab, a high-affinity monoclonal anti-IgE antibody, may also efficiently relieve symptoms of unresponsive chronic urticaria to standard therapies. This comprehensive review aims to present recently acquired knowledge on managing chronic spontaneous urticaria with new anti-IgE antibodies. We conducted extensive research on the main databases (PubMed, Google Scholar, and Web of Science) with no restrictions on the years covered, using the search terms “anti-IgE antibodies”, “omalizumab”, “ligelizumab”, and “chronic spontaneous urticaria”. The inclusion criteria were English written articles, and the exclusion criteria were animal-related studies. ClinicalTrials.gov was also reviewed for recent relevant clinical trials related to CSU treatment. CSU is a challenging disease with a significant effect on patients’ quality of life. Current therapies often fail to control signs and symptoms, and additional treatment is needed. New biologic therapies against IgE antibodies and FcεRIα receptors are currently under investigation in advanced clinical trials. We reviewed recently published data on CSU management using these novel treatments. The development of new and improved treatments for CSU will lead to a more personalized therapeutical approach for patients and provide guidance for physicians in better understanding disease mechanisms. However, some agents are still in clinical trials, and more research is needed to establish the safety and efficacy of these treatments.

The Potential Role of Basophils in Urticaria

Urticaria is a symptom of acute skin allergies that is not clearly understood, but mast cell histamine is hypothesized to cause swelling and itching. Omalizumab, an anti-human IgE antibody that traps IgE and prevents its binding to high-affinity IgE receptors, is effective in treating urticaria. We recently experienced a case of urticaria refractory to antihistamine therapy in which the peripheral-blood basophil count responded to omalizumab therapy and its withdrawal. Furthermore, the peripheral-blood basophils showed an unexpected increase in the expression of a cell surface activation marker. This phenomenon has been reported by other analyses of basophil and mast cell dynamics during omalizumab treatment. Here, we analyze these observations and formulate a hypothesis for the role of basophils in urticaria. Specifically, that activated basophils migrate to the local skin area, lowering peripheral-blood counts, omalizumab therapy alters basophilic activity and causes their stay in the peripheral blood. We hope that our analysis will focus urticaria research on basophils and reveal new aspects of its pathogenesis.

Phase 2, randomized multi oral immunotherapy with omalizumab 'real life' study

BACKGROUND

Oral immunotherapy (OIT) is frequently discontinued due to adverse events (AEs) and current data suggests that lowering OIT doses can minimize severity and frequency of AEs. However, the minimum daily dose that can enable desensitization and induce immune responses in multi-food OIT (mOIT) is unknown.

METHODS

Participants aged 2-25 years with multi-food allergies were pretreated with fixed-dose omalizumab (150 mg, 3 doses, every 4 weeks), and randomized 1:1 to receive mOIT to a total maintenance dose of either 300 or 1200 mg total protein, (total dose includes at least two and up to a max of five allergens) and then transitioned to real-food protein equivalents after 18 weeks of treatment. The primary endpoint was the proportion of subjects with increases in IgG4/IgE ratio of at least 2 allergens by ≥25% from baseline after 18 weeks of therapy. The primary efficacy and safety analyses were done in the intention-to-treat population.

RESULTS

Sixty participants were enrolled across two sites. Seventy percent of participants in both arms showed changes in sIgG4/sIgE ratio in at least 2 allergens with no difference between the treatment groups (OR [95% CI] = 1.00 [0.29, 3.49]). Overall, there were no differences in AEs between the 300 and 1200 mg groups (19% vs. 17%, p = .69), respectively.

CONCLUSIONS

Our data suggest that plasma marker changes are induced early, even at a total protein dose of 300 mg inclusive of multiple allergens when mOIT is combined with fixed-dose omalizumab. Identification of optimal mOIT dosing with adjunct omalizumab is needed for the long-term success of OIT.

TRIAL REGISTRATION

ClinicalTrials.gov (NCT03181009).

Omalizumab for STAT3 Hyper-IgE Syndromes in Adulthood: A Case Report and Literature Review

Background

Hyper-immunoglobulin E (IgE) syndromes (HIES) are a group of primary immune deficiencies disorders (PID) characterized by elevated serum IgE, eczema, recurrent skin, or respiratory system infections and may also be accompanied by some connective tissues and skeletal abnormalities. Currently, there is no complete cure or targeted treatment for HIES. Omalizumab is a humanized recombinant monoclonal antibody against IgE, reducing the level of free IgE, inhibiting the binding of IgE to receptors on the surface of effector cells, and reducing the activation of inflammatory cells and the release of multiple inflammatory mediators. However, the effect of omalizumab in treating HIES remains unknown. Herein, we described a case of an AD-HIES patient with chronic airway disease who benefited from omalizumab treatment.

Case Presentation

A 28-year-old Chinese woman was admitted for recurrent cough for 7 years, markedly elevated serum IgE level, and recurrent pneumonia caused by multiple pathogens, such as Pneumocystis jirovecii, Cytomegalovirus, Staphylococcus aureus, Aspergillus, and Mycobacterium tuberculosis. She had eczema-dermatitis, skin abscess, slightly traumatic fracture since childhood, and developed asthma and allergic bronchopulmonary aspergillosis (ABPA) lately. Using whole-exome sequencing, the STAT3 (c.1294G>T, p.Val432Leu) missense mutation for the autosomal dominant hyper-IgE syndrome was identified, and omalizumab was prescribed at 300 mg every 2 weeks. The patient responded well with the improvement of respiratory symptoms and lung function tests. The level of serum IgE remained stable on follow-up.

Conclusion

Omalizumab treatment proved beneficial in the case of HIES, especially with chronic airway disease, for which therapeutic options are limited. However, larger-scale prospective studies and long-term follow-up are required to establish the efficacy and safety of this therapeutic intervention.

A review of phase III clinical trials of US FDA-approved biologic therapies for chronic rhinosinusitis with nasal polyposis

Chronic rhinosinusitis with nasal polyposis is a heterogenous disease with complex underlying pathophysiologic mechanisms. Biologics have been proven to be an effective add-on therapeutic option in severe and/or refractory cases. Currently, dupilumab, omalizumab and mepolizumab have phase III data to support their use in these patients and have received approval from the United States Food and Drug Administration specifically for the treatment of nasal polyposis. Each of these biologics has shown its ability to reduce nasal polyp size and improve nasal congestion/obstruction and sense of smell, but additional research is needed to directly compare the efficacy and safety of the different biologic agents for different nasal polyposis endotypes.

S. aureus and IgE-mediated diseases: pilot or copilot? A narrative review

INTRODUCTION

S. aureus is a major opportunistic pathogen that has been implicated in the pathogenesis of several chronic inflammatory diseases including bronchial asthma, chronic rhinosinusitis with nasal polyps (CRSwNP), chronic spontaneous urticaria (CSU), and atopic dermatitis. S. aureus can induce the production of both polyclonal and specific IgE that can elicit an inflammatory cascade.

AREAS COVERED

The link between the sensitization to S. aureus enterotoxins and the severity of several chronic inflammatory diseases is reviewed in detail, as well as its therapeutic implications.

EXPERT OPINION

An anti-IgE strategy to inhibit S. aureus enterotoxins would be a valid approach to treat several endotypes of severe asthma, CRSwNP and CSU in which IgE against S. aureus enterotoxins should represent, not only a marker of severity of the diseases but also a target of a treatment.

Efficacy and Safety of Omalizumab Treatment Over a 16-Year Follow-Up: When a Clinical Trial Meets Real-Life

Purpose

Treatment of severe asthma has made great strides thanks to rapid progress in understanding immune response and inflammatory pathways. This led to the advent of the first biologic for severe allergic asthma (SAA), omalizumab. Although the long-term efficacy and safety of omalizumab has been confirmed, increasingly longer follow-up data can further reinforce this evidence and potentially provide new ones, for example on any loss of efficacy or the appearance of unexpected side effects. This study reports omalizumab treatment-related outcomes after 16 years of follow-up.

Patients and Methods

In this real-life retrospective study, an extension of a previous 9-year follow-up study on patients initially recruited in a clinical trial, we enrolled 8 adult patients with SAA followed-up from November 2005 to December 2021. Study subjects were selected based on omalizumab eligibility criteria.

Results

Exacerbation rate significantly decreased from 3.6 ± 2.1 events in year before index date to 0.1 ± 0.4 after 32 weeks of treatment (p < 0.0001). Mean annual number of mild-to-moderate exacerbations at 16 years was 0.88 compared with 1.8 in the year before the index date and 1.1 at 32 weeks. No hospitalizations were documented during the 16-year follow-up compared to 0.3 hospitalizations/patient in the year before the index date. Respiratory function also progressively and significantly improved. Regarding patient-reported outcomes (PROs), The AQLQ and ACT significantly improved from baseline throughout the follow-up, particularly up to 9 years of follow-up. During the study, an overall reduction in doses of asthma medications was observed, with a significant OCS-sparing effect.

Conclusion

Our study, the longest clinical follow-up on patients treated with anti-IgE, confirms and amplifies the results of the studies carried out so far, as they are maintained over a very long interval of time without drops in efficacy without any type of side effect.

An Overview of Off-Label Use of Humanized Monoclonal Antibodies in Paediatrics

In recent years, off-label and unlicensed drug use has extensively developed in the paediatric population. For a long time, clinical trials in the paediatric population were considered complicated to perform because of ethical problems, causing frequent off-label use. Off-label drug use remains an important public health issue, especially for children with rare conditions or with diseases not responsive to conventional treatments. The present paper is a narrative review of the literature of off-label drug use in children. The aim of our study is to summarize the main works dealing with the off-label use of biological drugs in paediatrics. Further studies analyzing their efficacy, safety, and cost-benefit ratios are needed to extend the use of biological therapies to the paediatric population.

Case Report: Safety and Efficacy of Omalizumab in a 13-Year-Old Patient With Chronic Spontaneous Urticaria and Type 1 Diabetes

Chronic urticaria (CU) is defined by the presence of itchy wheals, sometimes accompanied by angioedema, lasting for at least 6 weeks. CU is treated with second-generation antihistamines, increased up to four times the normal doses for second-line treatment. Omalizumab (a monoclonal antibody anti-IgE) may be recommended as third-line therapy in children aged over 12 years. Few reports have suggested that glucose homeostasis is impaired in some type 2 diabetic patients receiving omalizumab, and even in non-diabetic patients, fasting blood glucose and HOMA-IR values appeared to be significantly increased. We report the case of a 13-year-old girl with diabetes mellitus type 1 and chronic spontaneous urticaria (CSU) refractory to standard recommended therapy that we treated with omalizumab at a standard recommended dose of 300 mg every 4 weeks. We observed a rapid and complete remission of CSU after treatment with this humanized monoclonal antibody without detrimental effects on the patient's glucose control especially in terms of HbA1c (glycated hemoglobin), time in glycemic range (TIR), and daily insulin needs.

Omalizumab for the Treatment of Bullous Pemphigoid: A Systematic Review of Efficacy and Safety

Bullous pemphigoid (BP) is an autoimmune blistering skin disease. Current treatment strategies are limited by their efficacy and/or side effect profile and the need for safer and effective alternatives is undeniable. We aimed to conduct a systematic review focusing on the efficacy and safety of omalizumab in BP patients. Embase, PubMed, Cochrane, and clinicaltrials.gov were searched for English and French articles published from inception to July 1, 2021, using search terms "omalizumab" OR "Xolair" OR "IGE025" OR "olizumab" AND "bullous pemphigoid." Screening and data extraction was performed by two raters independently. The primary outcome was complete response (CR), and secondary outcomes were partial response (PR), flare-ups, adverse events/vital status. In total, 22 articles were included, with a total of 56 patients. All patients had a refractory BP with mean disease duration of 13.5 ± 20.2 months (Standard Deviation (SD)) and failed 3.1 ± 1.6 therapies and many remained corticosteroids dependent. Overall, 87.5% of patients responded to treatment (55.4% CR and 32.1% PR), 7.1% discontinued the protocol and only 5.4% were non responders. A third of patients were able to discontinue all other therapies and most others were able to discontinue or taper systemic corticosteroids to <10 mg daily. Flare-ups occurred in 57.7% of patients upon discontinuation of omalizumab and/or steroid tapering, most patients recaptured response thereafter. Omalizumab was well tolerated by most patients. Omalizumab appears to be a promising treatment for BP with a good response rate and safety profile. However, several limitations were identified in current literature, and highlight the need for randomized controlled trials of omalizumab in BP.

Lower efficacy of omalizumab in older adults with chronic spontaneous urticaria

Omalizumab is known to be effective in treating chronic spontaneous urticaria (CSU) with an inadequate response to H₁ -antihistamine. Although many reports have described pre-treatment biomarkers to predict the efficacy of omalizumab in CSU, there are few reports that examined the relationship between age and the therapeutic effectiveness of omalizumab. Thus, we aimed to investigate the relationship between response to omalizumab and age. This retrospective study comprised 52 CSU patients receiving three consecutive omalizumab courses during the period from April 2017 to March 2021. Participants were categorized as responders or non/partial responders using the urticaria control test to evaluate clinical variables on week 12. The female rate tended to be higher, and the mean age and the median disease duration tended to be lower with no significance in responders compared with in non/partial responders. In addition, they exhibited no significant differences regarding serum immunoglobulin E levels, basophil counts, eosinophil counts, d-dimer, and autologous serum skin test results reported as predictor in the past between two groups. Interestingly, when patients were categorized as age <65 years or ≥65 years, those in the ≥65 years group had a significantly lower response to omalizumab than those aged <65 years. These findings suggest that physicians should keep in mind that the age of their CSU patients may be a predictor of the therapeutic efficacy of omalizumab.

Combination therapy of specific aeroallergens immunotherapy and omalizumab, in children with severe asthma

BACKGROUND

In most cases, severe asthma in children has an allergic etiology, but allergen-specific immunotherapy (AIT) is contraindicated.

OBJECTIVE

This study aimed at analyzing the safety and efficacy of AIT in patients with severe asthma treated with omalizumab (OM).

METHODS

A descriptive real-life study was carried out by reviewing medical records. Effectiveness was measured by the degree of control (CAN questionnaire), number of hospitalizations per year, number of exacerbations per year, and maintenance treatment and lung function (FEV1). Some adverse reactions occurred (AAI-EAACI-WAO guidelines).

RESULTS

The retrospective study included 29 patients up to 18 years of age with severe asthma with OM plus AIT treatment. AIT treatment was started in a cluster schedule when patients treated with OM achieved disease control. Before starting AIT, patients were treated with OM for 1 year for achieving asthmatic control. AIT to mites (51%), Alternaria (37.9%), or pollens (10.3%) was administered. After one year with OM plus AIT,statistically significant differences in CAN scores and FEV1 measures were observed (P < 0.001). No patients under treatment with OM plus AIT required hospital admission. During the clustering schedule, only 3/64 doses showed systemic adverse reactions. During the AIT maintenance treatment, 348 doses were administered, with no significant adverse reactions.

CONCLUSION

In this population-based study in children with severe asthma, the combined treatment with OM plus AIT was safe and effective. This strategy allows these pediatric patients to be safely treated with AIT.

Linear IgA/IgG bullous dermatosis successfully treated with omalizumab: A case report

Linear IgA/IgG bullous dermatosis (LAGBD) is a rare, autoimmune blistering skin disease. We report a case of LAGBD in a 70-year-old woman. All common treatments were discontinued due to side effects or lack of treatment response. The patient was successfully treated with omalizumab which cleared her lesions after three months.

Sex differences in the efficacy of omalizumab in the treatment of chronic spontaneous urticaria

Background

Omalizumab is shown to be effective in the treatment of chronic spontaneous urticaria (CSU), a disease with high personal and social impact. Sex differences in CSU are recognized with women more frequently affected. Scarce is the knowledge about response to omalizumab between sex groups. We sought to identify any differences based on the sex of patients receiving omalizumab.

Methods

We evaluated data of patients diagnosed with CSU refractory to high-dose second-generation H1 antihistamines and treated with 300 mg omalizumab every 4 weeks for 6 months and then at relapse.

Results

Discussion: All patients, regardless of sex, age, or any other factor, achieved the clinical remission of the disease after the first 3 doses with a reduction of the disease activity indices and impact on the quality of life. Recurrences predominate in men, two months after the suspension of the drug. Respect to sex and recurrence we did not find any correlation with age, body mass index, peripheral eosinophil counts, total IgE levels, D-dimer, plasma prothrombine level or C-reactive protein. We found no sex differences in tolerability and safety. CSU in girls may persist longer and have worse prognosis, but no one has so far noted sex differences in response to omalizumab.

Conclusions

Although there are no certainties on the mechanism of action of omalizumab in CSU, the noticeable difference in response between males and females lead us to suppose a role of the hormonal balance both on the pathogenesis of the CSU and on the efficacy of OmAb.

Coesisting inflammatory skin diseases: Tildrakizumab to control psoriasis and Omalizumab for urticaria

In Western countries the number of individuals suffering from an autoimmune condition is constantly growing and often patients suffering from autoimmune disease are susceptible to developing a second autoimmune disorder. We report a case of an adult female patient affected by psoriasis vulgaris and treated with tildrakizumab, a humanized monoclonal antibody targeting interleukin-23, who later developed chronic spontaneous urticaria and started omalizumab, a humanized antibody to IgE, showing a favorable outcome. We speculate that the two combined therapies have restored the cytokine balance bringing it towards tolerance and remission of the two pathologies. It is conceivable that tildrakizumab may have a synergic action with omalizumab in the treatment of urticaria in patients affected by both psoriasis and urticaria. Our case and the study of the mechanisms of action of the two drugs suggest how the two therapies can act with an interlocking mechanism in achieving the final therapeutic effect.

Retrospective evaluation of patients with chronic spontaneous urticaria using omalizumab during the COVID-19 pandemic

INTRODUCTION

Omalizumab (OMZ) is a monoclonal anti-immunoglobulin E antibody used in patients with chronic spontaneous urticaria (CSU). The data about using OMZ during the coronavirus disease 19 (COVID-19) pandemic are limited. The aim of this study was to evaluate the status of having COVID-19 and relationships between COVID-19, vaccination, and urticaria symptoms of CSU patients on OMZ.

METHOD

We conducted a retrospective cohort study of 36 adult CSU patients treated with OMZ. Demographic data, the results of COVID-19 real-time polymerase chain reaction (RT-PCR), and vaccination status were recorded from the electronic medical records.

RESULTS

Thirty-six patients, 23 women, and 13 men were evaluated. The mean age was 45.81 years. Two patients were diagnosed with COVID-19 while using OMZ. Four patients interrupted their OMZ treatment during the pandemic, and OMZ treatments were restarted in all patients. There were 28 patients who had at least one dose of vaccine (inactive and/or mRNA vaccine). Only one patient had an urticaria exacerbation after the first dose of mRNA vaccine.

CONCLUSION

As a result, our findings have shown that omalizumab treatment in CSU patients during the COVID-19 pandemic does not increase the risk of COVID-19 infection and omalizumab can be used safely.

IgE and high-affinity IgE receptor in chronic inducible urticaria, pathogenic, and management relevance

BACKGROUND

IgE and high-affinity IgE receptor (FcεRI) expression on basophils have been scarcely explored in patients with chronic inducible urticaria (CIndU).

OBJECTIVES

To investigate baseline serum IgE and FcεRI expression on blood basophils in a large cohort of CIndU patients and its relationship to treatment response.

METHODS

Baseline total serum IgE and basophil FcεRI expression measured by flow cytometry in 165 patients with CIndU was studied. The relationship of both parameters with the response to antihistamine and anti-IgE (omalizumab) treatment was considered in a subsample of CIndU patients. FcεRI expression in basophils was assessed by mean fluorescence intensity (MFI) and basophil FcεRI standardized density (receptors/cell).

RESULTS

The median FcεRI expression standardized per density in blood basophils was found significantly higher in patients with CIndU compared to HCs. A positive correlation was found between IgE serum levels and basophil FcεRI expression. Basal FcεRI expression was not related to antihistamine treatment response. However, it was related to omalizumab, and patients responding to omalizumab showed higher basal basophil expression of FcεRI levels. Non-responders to the antihistamine showed significantly higher IgE serum levels.

CONCLUSIONS

FcεRI receptor overexpression in patients with CIndU shows almost the same pattern than chronic spontaneous urticaria. It seems to be independent of CIndU subtypes. Although additional studies would be welcome, our work highlights the relevance of FcεRI receptor regulation in CIndU supporting autoimmune basophil and mast cell activation and may be a biomarker for response to anti-IgE therapy.

Predictors of a Minimal Clinically Important Difference Following Omalizumab Treatment in Adult Patients With Severe Allergic Asthma

Several factors have been found to be predictors of a good response following omalizumab treatment in patients with severe allergic asthma (SAA). However, it remains unclear whether clinical characteristics can predict a minimal clinically important difference (MCID) following omalizumab treatment in this population. Therefore, the aim of this study was to investigate the features associated with an MCID following omalizumab treatment in adult patients with SAA. Of the 124 participants enrolled in this retrospective, cross-sectional study, 94, 103, 20 and 53 achieved the MCID following treatment with omalizumab and were considered to be responders of exacerbation reduction (no exacerbation during the 1-year follow-up period or ≧50% reduction in exacerbations from baseline), oral corticosteroid (OCS) sparing (no use of OCS to control asthma during the study period or a reduction of the monthly OCS maintenance dose to <50% of baseline), lung function (an increase of ≧230 ml in the forced expiratory volume in 1 s from baseline) and asthma control (an increase of ≧3 points in the asthma control test score from baseline), respectively. Normal weight [<25 vs. ≧30 kg/m², odds ratio (OR) = 3.86, p = 0.024] was predictive of a responder of reduction in exacerbations following omalizumab treatment while subjects with a blood eosinophil level of <300 cells/μL (<300 vs. ≧300 cells/μL, OR = 5.81, p = 0.001) were more likely to exhibit an MCID in OCS sparing. No factor was found to be a predictor of lung function or asthma control. When choosing treatment for adult patients with SAA, our findings may help to select those who may benefit the most from omalizumab treatment.

Severe pediatric asthma with a poor response to omalizumab: a report of three cases and three-dimensional bronchial wall analysis

Omalizumab is used for the treatment of persistent severe allergic asthma in adults and children. However, some patients remain symptomatic even after omalizumab treatment. In bronchial asthma, chronic inflammation of the bronchial wall causes thickening of the airway wall, resulting from irreversible airway remodeling. Progression of airway remodeling causes airflow obstruction, leading to treatment resistance. We report three Japanese children with severe asthma who had a poor response to omalizumab treatment. They had a long period of inadequate management of asthma before initiating omalizumab. Even after omalizumab treatment, their symptoms persisted, and the parameters of spirometry tests did not improve. We hypothesized that omalizumab was less effective in these patients because airway wall remodeling had already progressed. We retrospectively evaluated the bronchial wall thickness using a three-dimensional bronchial wall analysis with chest computed tomography. The bronchial wall thickness was increased in these cases compared with six responders. Progressed airway wall thickness caused by airway remodeling may be associated with a poor response to omalizumab in children with severe asthma.

Efficacy and safety of omalizumab in Chinese patients with anti-histamine refractory chronic spontaneous urticaria

Chronic spontaneous urticaria (CSU) is characterized by the spontaneous development of wheals, itching, and/or angioedema, for ≥6 weeks. In China, non-sedating H1-antihistamines (H1AH) are the recommended first-line treatment, with escalation up to 4× the standard dose in symptomatic patients to achieve control. Treatment options for Chinese patients who remain symptomatic on H1AH treatment are limited. This 20-week randomized, double-blind, placebo-controlled, parallel-group study investigated the efficacy and safety of omalizumab as an add-on therapy for the treatment of patients with CSU who remained symptomatic despite H1AH treatment in China. Adult patients (N = 418) diagnosed with refractory CSU for ≥6 months were randomized (2:2:1) to receive omalizumab 300 mg (OMA300), omalizumab 150 mg (OMA150) or placebo, subcutaneously, every 4 weeks. Primary outcome was change from baseline to Week 12 in weekly itch severity score (ISS7). Safety was assessed by rates of adverse events (AEs). Demographic and disease characteristics at baseline were comparable across treatment groups. At week 12, statistically significant greater decreases from baseline were observed in ISS7 with OMA300 (least square mean difference [LSM]: -4.23; 95% confidence interval [CI]: -5.70, -2.77; P < 0.001) and OMA150 (LSM: -3.79; 95% CI: -5.24, -2.33; P < 0.001) vs. placebo. Incidence of treatment-emergent AEs over 20 weeks was slightly higher with OMA300 (71.3%) compared to OMA150 and placebo groups (64.7% and 63.9%, respectively). The incidences of serious AEs were balanced between groups. This study demonstrated the efficacy and safety of omalizumab in Chinese adult patients with CSU who remained symptomatic despite H1AH therapy. Trials registered at clinicaltrials.gov NCT03328897 Date of registration: 1 November 2017.

Safety of biological therapy in children and adolescents with severe asthma during the COVID-19 pandemic: a case series

Background and aim  It is still unclear whether patients with severe asthma are at greater risk of developing severe COVID-19, particularly pediatric allergic patients under biologic therapy. Studies targeting pediatric patients are currently limited; thus, this study aims to assess the clinical characteristics of young patients with severe asthma under biological therapies during the COVID-19 pandemic. Methods We collected data from February 2020 to April 2021. Patients with severe asthma treated with biological therapies (omalizumab and mepolizumab) have been enrolled. We described demographic data, clinical features, therapies, comorbidities, and laboratory findings for each patient. For patients who got COVID-19, we also described the severity of the disease, the need for hospitalization, and specific therapy. Results A total of 14 patients were included in the study, 11 (78.6%) of them under treatment with omalizumab and 3 (21.6%) with mepolizumab. We identified four patients (28.6%) who tested positive for SARS-CoV-2. Two patients treated with mepolizumab had an asymptomatic disease, and two patients treated with omalizumab had mild disease. Only one patient with mild COVID-19 required hospitalization and specific therapy because of severe obesity. Conclusions No differences regarding the SARS-CoV-2 infection have been found between the two treatments groups. Furthermore, any poor outcome has been observed, confirming the safety of biological therapies. The limited number of patients enrolled and the lack of a control group did not establish a significant risk for infections for these patients.

A European survey of management approaches in chronic urticaria in children: EAACI pediatric urticaria taskforce

BACKGROUND

Although well described in adults, there are scarce and heterogeneous data on the diagnosis and management of chronic urticaria (CU) in children (0-18 years) throughout Europe. Our aim was to explore country differences and identify the extent to which the EAACI/GA²LEN/EDF/WAO guideline recommendations for pediatric urticaria are implemented.

METHODS

The EAACI Task Force for pediatric CU disseminated an online clinical survey among EAACI pediatric section members. Members were asked to answer 35 multiple choice questions on current practices in their respective centers.

RESULTS

The survey was sent to 2,773 physicians of whom 358 (13.8%) responded, mainly pediatric allergists (80%) and pediatricians (49.7%), working in 69 countries. For diagnosis, Southern European countries used significantly more routine tests (eg, autoimmune testing, allergological tests, and parasitic investigation) than Northern European countries. Most respondents (60.3%) used a 2^nd -generation antihistamine as first-line treatment of whom 64.8% updosed as a second line. Omalizumab was used as a second-line treatment by 1.7% and third line by 20.7% of respondents. Most clinicians (65%) follow EAACI/WAO/GA2LEN/EDF guidelines when diagnosing CU, and only 7.3% follow no specific guidelines. Some clinicians prefer to follow national guidelines (18.4%, mainly Northern European) or the AAAAI practice parameter (1.7%).

CONCLUSIONS

Even though most members of the Pediatric Section of EAACI are familiar with the EAACI/WAO/GA2LEN/EDF guidelines, a significant number do not follow them. Also, the large variation in diagnosis and treatment strengthens the need to re-evaluate, update, and standardize guidelines on the diagnosis and management of CU in children.

[A CASE OF SEVERE ASTHMA RESULTING IN DISEASE EXACERBATION AFTER PROLONGATION OF THE DOSING INTERVAL AFTER LONG-TERM OMALIZUMAB ADMINISTRATION]

At the time of writing of this manuscript, four biologics were clinically available for the treatment of severe asthma, and there were no established recommendations for the period of administration or timing of discontinuation of each biologic. We present a case of severe asthma that was well controlled with long-term omalizumab treatment; however, prolongation of the dosing intervals resulted in disease exacerbation that was refractory to omalizumab treatment despite the restoration of the recommended interval of administration. We suspect that the prolonged dosing intervals might have reduced the efficacy of omalizumab. We report this case because dosing intervals should be considered in clinical practice in cases of long-term omalizumab treatment.

[FOOD-DEPENDENT EXERCISE-INDUCED ANAPHYLAXIS IMPROVED BY OMALIZUMAB PRESCRIBED FOR IDIOPATHIC CHRONIC URTICARIA]

A 13-year-old male patient suffered several episodes of anaphylaxis during exercise after consuming wheat. Provocation tests (consisting of exercise after wheat ingestion) were conducted twice at our hospital. Both tests were positive, resulting in a diagnosis of food-dependent exercise-induced anaphylaxis (FDEIA) due to wheat. The patient was instructed to avoid exercise after wheat ingestion. The patient had also been previously diagnosed with idiopathic chronic urticaria, which was treated with antihistamines and leukotriene receptor antagonists. Since the idiopathic chronic urticaria worsened despite the use of these medications, 300 mg per four weeks of omalizumab was initiated. The patient's symptoms improved, and a third provocation test came back negative. The patient was asymptomatic without exercise restriction when treated with omalizumab. Omalizumab is not typically prescribed for treating food allergies and EIA in Japan; however, there are some reports on their effectiveness in treating them, suggesting omalizumab may also be helpful in resolving FDEIA symptoms.

Omalizumab is effective in the preseasonal treatment of seasonal allergic rhinitis

BACKGROUND

To date no study has evaluated the efficacy of preseasonal omalizumab therapy with cost effective dose and at appropriate time point compared with standard medication in seasonal allergic rhinitis (SAR) patients.

METHODS

This was a prospective randomized controlled open-label single-centre trial. 32 SAR patients were randomized to receive a single injection of omalizumab 300-mg approximately two weeks before start of the pollen period (PP) or medication therapy. All patients completed daily questionnaires; recording symptoms, medication use and quality of life (QoL) throughout the observation period. The primary efficacy parameter was the mean daily Combined Symptom and Medication Score (CSMS).

RESULTS

Preseasonal omalizumab significantly reduced the changes of mean daily CSMS of nose during the PP (p < 0.001), peak pollen period (PPP) and PP after PPP (PPP-PP) (p = 0.002) and Post-PP (p = 0.009) compared to standard medication. The proportion of allergy symptoms-relieving medication-free days during PPP-PP was also significantly higher in preseasonal omalizumab-treated group (76.2(16.7-98.8))% than in medication-treated group (19.0(0-71.4))% (p = 0.030). Omalizumab could achieve the same nasal symptom control during the entire pollen season and better eye symptoms relieving results in PP (p = 0.046) and PPP-PP (p = 0.004) than medication treatment. Significantly greater improvement in QoL was also obtained with omalizumab-pretreatment during the PP (p = 0.037) and PPP-PP (p = 0.004).

CONCLUSIONS

Administration of a single injection of 300 mg omalizumab two weeks before start of the pollen season achieves better overall control of symptoms and QoL, with significantly reduced allergy symptoms-relieving medication usage, compared with standard pharmacotherapy in SAR patients.

EAACI Biologicals Guidelines-Omalizumab for the treatment of chronic spontaneous urticaria in adults and in the paediatric population 12-17 years old

Chronic spontaneous urticaria (CSU) imposes a significant burden on patients, families and healthcare systems. Management is difficult, due to disease heterogeneity and insufficient efficacy of classical drugs such as H₁ R-antihistamines. Better understanding of the mechanisms has enabled a stratified approach to the management of CSU, supporting the use of targeted treatment with omalizumab. However, many practical issues including selection of responders, the definition of response, strategies to enhance the responder rate, the duration of treatment and its regimen (in the clinic or home-based) and its cost-effectiveness still require further clarification. The EAACI Guidelines on the use of omalizumab in CSU follow the GRADE approach in formulating recommendations for each outcome. In addition, future therapeutic approaches and perspectives as well as research priorities are discussed.

Efficacy and Safety of Omalizumab for the Treatment of Severe or Poorly Controlled Allergic Diseases in Children: A Systematic Review and Meta-Analysis

OBJECTIVE

To evaluate the efficacy and safety of omalizumab in the treatment of severe or uncontrolled allergic diseases in children.

METHODS

We conducted a systematic search of the PubMed, Embase, CENTRAL, and clinicaltrials.gov databases up to 23rd July 2021, with no language limitations. Randomised controlled trials (RCTs) comparing omalizumab with other treatments or placebo in children with severe or inadequately controlled allergic diseases were considered. The primary outcomes of interest were asthma exacerbation rate, allergic symptom score, desensitisation achievement for food allergy (FA), and incidence of serious adverse events (SAEs). The study selection and data extraction were conducted independently by two researchers. Quality assessments were conducted using the Cochrane risk-of-bias tool, and data were pooled using a random-effects model if I ² was 50% or greater in the Cochrane Review Manager.

RESULTS

Overall, 10 RCTs [six on severe asthma, one on atopic dermatitis (AD), one on seasonal allergic rhinitis [SAR], and one on FA] consisting of 2,376 participants met the inclusion criteria. For severe asthma, omalizumab may reduce exacerbations at 12 weeks [risk ratio (RR), 0.52; 95% confidence interval (CI), 0.31-0.89], 24 weeks (RR, 0.69; 95% CI, 0.55-0.85; GRADE: moderate-quality evidence), and 52 weeks (RR, 0.62; 95% CI, 0.40-0.94; GRADE: moderate-quality evidence) and reduce the dose of inhalation corticosteroid compared with placebo. For severe AD, the association between omalizumab and allergic symptom improvement [i.e., SCORing Atopic Dermatitis or Paediatric Allergic Disease Quality of Life Questionnaire (PADQLQ)] was not confirmed. For severe SAR, omalizumab showed greater improvement in symptom load scores and saved rescue medication days. For FA, omalizumab demonstrated superiority in desensitisation compared with placebo. To date, no clinically significant drug-related SAEs have been reported.

CONCLUSION

For severe or uncontrolled asthma, AD, SAR, and FA, omalizumab may be associated with improved allergic symptoms and safety in children. Future studies should focus on the benefits and pharmacoeconomic evaluation of omalizumab in multiple allergic diseases compared with other treatments.

SYSTEMATIC REVIEW REGISTRATION

[https://www.crd.york.ac.uk/PROSPERO], identifier [CRD42021271863].

Switching from omalizumab to mepolizumab therapy improved extra-pulmonary abdominal and cutaneous vasculitis symptoms in a patient with eosinophilic granulomatosis with polyangiitis

Eosinophilic granulomatosis with polyangiitis (EGPA) is a systemic vasculitis of small-to-medium-sized vessels. Both eosinophilic infiltration and vasculitis are thought to contribute to multi-organ damage. Some biologics have been used to reduce the required dose of corticosteroids in EGPA, but no single agent can ensure a complete control of this disease. Here, we describe a patient with anti-neutrophil cytoplasmic antibodies-negative relapsing EGPA whose asthma control was improved by omalizumab, but she continued to develop flares of abdominal and cutaneous vasculitis symptoms. After switching to mepolizumab therapy, her blood hypereosinophilia and extra-pulmonary symptoms were significantly improved. Moreover, the dose of daily maintenance corticosteroid could be tapered off. The experience from our case suggests that biologics targeting interleukin-5 may be more effective than omalizumab in the management of extra-thoracic manifestations in EGPA.

Oral Immunotherapy in Children: Clinical Considerations and Practical Management

Oral immunotherapy (OIT) in pediatric patients provides an alternative option to the current standard of care in food allergy, which is allergen avoidance and reactive treatment. Because patients are exposed to one or more food allergens during treatment, OIT is associated with adverse events and can be a cumbersome process for children, their caregivers, and clinicians. However, there have been an overwhelming number of studies that show high efficacy in both single- and multi-allergen OIT, and that quality of life is greatly improved for both patients and their families after undergoing immunotherapy. This review discusses clinical considerations for OIT in pediatrics, including efficacy and safety, practical management, and future directions of treatment.

Impact of Anti-Type 2 Inflammation Biologic Therapy on COVID-19 Clinical Course and Outcome

SARS-CoV-2 pandemic had a general and deep impact on the clinical management of chronic diseases, including respiratory and allergic disorders. At the beginning of the pandemic, one of the main concerns was the potential impact of immunosuppressive/immunomodulatory drugs on COVID-19 clinical course. In this review, we aim to summarize and analyze the available clinical evidence from patients treated with anti-type 2 inflammation biologics (including anti-IgE, anti-IL-5 and anti-IL-4 agents), who developed COVID-19. Overall, the treatment with anti-Th2 biologics can be considered safe during COVID-19. It does not worsen the clinical course and outcome of COVID-19, and it may be actually protective somehow from developing severe forms. Moreover, patients treated with these biological agents do not seem to be more prone to get infected by SARS-CoV-2.

Analysis of clinical factors as possible predictors of response to omalizumab and relapse after treatment discontinuation in chronic spontaneous urticaria

Omalizumab is a monoclonal anti-IgE antibody which is effective in chronic spontaneous urticaria (CSU), although clinical response appears to be variable in the real-life setting. The aim of this study was to evaluate whether the response of CSU to omalizumab and disease relapse are associated with individual and/or clinical characteristics of patients. We retrospectively evaluated the clinical records of 124 patients treated with omalizumab for moderate to severe CSU refractory to antihistamines. Disease activity was assessed using the urticaria activity score over the last 7 days (UAS7). After 24 weeks of treatment, 91% of patients showed complete remission (UAS7 = 0) or good control (UAS7 < 7) of CSU. Omalizumab was re-administered in 45 patients because of recurrence of moderate to severe symptoms at week 8 after treatment discontinuation or later, and clinical results achieved with retreatment were similar to those observed in the first course. Among the parameters included in our analysis (age and sex of patients, documented history of atopy or autoimmune thyroid disease, CSU duration and baseline severity, concurrent angioedema, and association with chronic inducible urticaria), none was associated with response to omalizumab in our study population. Similarly, these parameters did not significantly differ between patients who experienced CSU relapse and those without relapse. Predictors of response to omalizumab treatment in CSU patients are still unclear, and further studies are needed to evaluate the presence of baseline factors that can influence treatment outcome.

Switch from Omalizumab to Benralizumab in Allergic Patients with Severe Eosinophilic Asthma: A Real-Life Experience from Southern Italy

Background. The wide availability of monoclonal antibodies for the add-on therapy of severe asthma currently allows for the personalization of biologic treatment by selecting the most appropriate drug for each patient. However, subjects with overlapping allergic and eosinophilic phenotypes can be often eligible to more than one biologic, so that the first pharmacologic choice can be quite challenging for clinicians. Within such a context, the aim of our real-life investigation was to verify whether allergic patients with severe eosinophilic asthma, not adequately controlled by an initial biologic treatment with omalizumab, could experience better therapeutic results from a pharmacologic shift to benralizumab. Patients and methods. Twenty allergic patients with severe eosinophilic asthma, unsuccessfully treated with omalizumab and then switched to benralizumab, were assessed for at least 1 year in order to detect eventual changes in disease exacerbations, symptom control, oral corticosteroid intake, lung function, and blood eosinophils. Results. In comparison to the previous omalizumab therapy, after 1 year of treatment with benralizumab our patients experienced significant improvements in asthma exacerbation rate (p < 0.01), rescue medication need (p < 0.001), asthma control test (ACT) score (p < 0.05), forced expiratory volume in the first second (FEV₁) (p < 0.05), and blood eosinophil count (p < 0.0001). Furthermore, with respect to the end of omalizumab treatment, the score of sino-nasal outcome test-22 (SNOT-22) significantly decreased after therapy with benralizumab (p < 0.05). Conclusion. The results of this real-life study suggest that the pharmacologic shift from omalizumab to benralizumab can be a valuable therapeutic approach for allergic patients with severe eosinophilic asthma, not adequately controlled by anti-IgE treatment.

High-dose non-sedating antihistamines are used insufficiently in chronic urticaria patients treated with omalizumab

BACKGROUND

The lifetime prevalence of chronic urticaria (CU) is 0.5%-1%. In some patients with CU, symptomatic control is not achieved with non-sedating second-generation H1 antihistamines (nsAH1) alone, even with quadrupled standard doses as recommended in international guidelines. In these cases, biological treatment with omalizumab can be added. Since omalizumab is expensive compared to antihistamines, lack of adherence to guidelines for high dose nsAH1 (up to four-fold standard dose per day) may be associated with substantial unnecessary costs. The aim was to measure the use nsAH1 before and during omalizumab use for the first time in an omalizumab treated CU population.

METHODS

We identified all Danish patients with CU who initiated omalizumab from March 2014 to December 2018 and evaluated new and ongoing nsAH1 treatments using the Danish nationwide registries.

RESULTS

A total of 955 CU patients initiated treatment with omalizumab within the study period (median age 40 years [IQR 28-50], 74.5% females). During the 12 months prior to omalizumab initiation, 95.6% of the patients filled at least one prescription with nsAH1 at some point, while 84.7% filled at least one prescription during the three months before omalizumab. From 3 months before omalizumab initiation till 3 months after, the proportions of users of high-dose nsAH1 was maximum 31.1%.

CONCLUSIONS

Omalizumab was usually administered before sufficient nsAH1 treatment was tried. In despite of the labelling that omalizumab should be co-administered with high dose nsAH1, this does not happen This may lead to substantial unnecessary costs.

Omalizumab for successful chemotherapy desensitisation: What we know so far

BACKGROUND

Hypersensitivity reactions induced by chemotherapeutic drugs may influence the course of the oncologic disease by preventing doctors from prescribing first-line therapy. In order to prevent another hypersensitivity reaction to the culprit chemotherapeutic agent, the physician can decide between two possibilities: premedication or desensitisation protocols. Rapid drug desensitisation showed successful results for most patients, but some of them may develop symptoms. Although omalizumab is not licensed as premedication or adjuvant therapy in chemotherapy desensitisation protocols, there have been published some case reports and small sample size studies that indicated promising results.

METHODS

We reviewed all the published literature regarding the use of omalizumab during chemotherapy desensitisation protocols.

RESULTS AND CONCLUSIONS

We found a great heterogeneity between the doses and the interval between omalizumab injections and chemotherapy - rapid drug desensitisation, but most of the studies showed promising results. As a corollary, we propose a dose regimen of omalizumab administered before the first desensitisation protocol. Then, omalizumab should be administered one day before every chemotherapy regimen. Omalizumab might be used as an adjuvant therapy and might be a solution for a hopeless situation.

[In vitro study on the individual binding ability of omalizumab with free IgE]

Objective:To investigate the individual binding ability of omalizumab to free IgE and its effect on omalizumab action. Methods:A total of 28 serum samples were collected from patients with allergic rhinitis and divided into groups with high, medium and low concentrations of free IgE. Different doses of omalizumab were administered in vitro for inhibitory binding. Enzyme linked immunosorbent assay was used to detect changes in serum free IgE after inhibition. The inhibition constant of omalizumab on serum free IgE was calculated. At the same time, the binding ability of omalizumab and individual free IgE was analyzed. Results:In general, when 100% serum free IgE was inhibited, the omalizumab required was positively correlated with the original serum free IgE concentration（9.500±7.207, 8.636±7.375, and 0.786±0.857 for the high, medium, and low IgE concentration groups, respectively）. The dose of omalizumab required for inhibition of 50% free IgE in serum was significantly lower（0.049±0.071, 0.046±0.077, 0.048±0.048 in the high, medium, and low IgE concentrations groups, respectively）. The 100% and 50% inhibition constants of serum free IgE in different individuals were different to some extent. Conclusion:Overall, the amount of omalizumab required to achieve the same inhibitory effect is proportional to the IgE concentration. In some sensitive patients, partial binding inhibition of free IgE can occur even when omalizumab is administered at less than the recommended dose. The binding ability of serum free IgE and omalizumab was different in different individuals. If this factor is used as a reference for the individual dose of omalizumab in clinical medicine, it is possible to achieve the expected efficacy more accurately.