Modern health care requires a proactive and individualized response to diseases, combining precision diagnosis and personalized treatment. Accordingly, the approach to patients with allergic diseases encompasses novel developments in the area of personalized medicine, disease phenotyping and endotyping, and the development and application of reliable biomarkers. A detailed clinical history and physical examination followed by the detection of IgE immunoreactivity against specific allergens still represents the state of the art. However, nowadays, further emphasis focuses on the optimization of diagnostic and therapeutic standards and a large number of studies have been investigating the biomarkers of allergic diseases, including asthma, atopic dermatitis, allergic rhinitis, food allergy, urticaria and anaphylaxis. Various biomarkers have been developed by omics technologies, some of which lead to a better classification of distinct phenotypes or endotypes. The introduction of biologicals to clinical practice increases the need for biomarkers for patient selection, prediction of outcomes and monitoring, to allow for an adequate choice of the duration of these costly and long-lasting therapies. Escalating healthcare costs together with questions about the efficacy of the current management of allergic diseases require further development of a biomarker-driven approach. Here, we review biomarkers in diagnosis and treatment of asthma, atopic dermatitis, allergic rhinitis, viral infections, chronic rhinosinusitis, food allergy, drug hypersensitivity and allergen immunotherapy with a special emphasis on specific IgE, the microbiome and the epithelial barrier. In addition, EAACI guidelines on biologicals are discussed within the perspective of biomarkers.

• Keywords
• allergen immunotherapy, allergic rhinitis, asthma phenotypes and endotypes, biomarkers, food allergy,
• MeSH
• Rhinitis, Allergic * diagnosis   therapy   MeSH
• Hypersensitivity * diagnosis   therapy   MeSH
• Dermatitis, Atopic * MeSH
• Biomarkers MeSH
• Asthma * diagnosis   therapy   MeSH
• Humans MeSH
• Food Hypersensitivity * MeSH
• Check Tag
• Humans MeSH
• Publication type
• Journal Article MeSH
• Review MeSH
• Names of Substances
• Biomarkers MeSH

Novel therapies such as type 2 targeting biologics are emerging treatment options for patients with chronic inflammatory respiratory diseases, fulfilling the needs of severely uncontrolled patients. The majority of patients with chronic rhinosinusitis with nasal polyps (CRSwNP) and over half of patients with asthma show a type 2 inflammatory signature in sinonasal mucosa and/or lungs. Importantly, both chronic respiratory diseases are frequent comorbidities, ensuring alleviation of both upper and lower airway pathology by systemic biological therapy. Type 2-targeting biologics such as anti-IgE, anti-IL4Rα, anti-IL5, and anti-IL5Rα have entered the market for selected pheno/endotypes of asthma patients and may soon also become available for CRSwNP patients. Given the high prevalence of chronic respiratory diseases and the high cost associated with biologics, patient selection is crucial in order to implement such therapies into chronic respiratory disease care pathways. The European Forum for Research and Education in Allergy and Airway Diseases (EUFOREA) organized a multidisciplinary Expert Board Meeting to discuss the positioning of biologics into the care pathways for CRSwNP patients with and without comorbid asthma.

• Keywords
• asthma, biologics, chronic rhinosinusitis, nasal polyps, type 2 inflammation,
• MeSH
• Biological Products administration & dosage   adverse effects   therapeutic use   MeSH
• Asthma complications   MeSH
• Chronic Disease MeSH
• Clinical Decision-Making MeSH
• Comorbidity MeSH
• Humans MeSH
• Disease Management MeSH
• Nasal Polyps complications   MeSH
• Rhinitis complications   drug therapy   MeSH
• Sinusitis complications   drug therapy   MeSH
• Treatment Outcome MeSH
• Research MeSH
• Health Services Needs and Demand MeSH
• Check Tag
• Humans MeSH
• Publication type
• Journal Article MeSH
• Consensus Development Conference MeSH
• Review MeSH
• Names of Substances
• Biological Products MeSH