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Systematic review of omalizumab for refractory clonal and non-clonal mast cell activation syndrome.

Allergy Asthma Proc

January 2025

From the Section of Allergy, Asthma and Immunology, Medicine and Pediatrics, Pennsylvania State University School of Medicine, Hershey, Pennsylvania and.

Patients with mast cell activation syndrome (MCAS) can be refractory to standard antimediator therapy. Alternative treatment options to reduce disease burden and improve quality of life are needed. To compile the evidence that supports the use of omalizumab for patients with refractory MCAS.

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Do No Harm: An Ethical Approach to Refractory Anaphylaxis to Chemotherapy.

Ann Allergy Asthma Immunol

November 2024

Section of Allergy and Immunology, Division of Pulmonary, Allergy, and Critical Care Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA; Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA. Electronic address:

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Article Synopsis
  • Anaphylaxis is a life-threatening allergic reaction, and understanding its triggers is crucial for preventing severe cases known as refractory anaphylaxis (RA).
  • A study analyzed data from 1,378 patients diagnosed with anaphylaxis, finding that 3.3% had RA, with a history of anaphylaxis being the strongest risk factor.
  • Other factors such as the use of beta-blockers/ACE inhibitors, exposure to IV contrast agents, and symptoms of low blood pressure were also linked to increased severity, highlighting the need for prompt treatment to improve patient outcomes.
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Background: Autoimmune diseases in children pose therapeutic challenges due to their refractory nature and the associated morbidity. Rituximab (RTX), a monoclonal antibody targeting CD20, has emerged as a promising steroid-sparing therapy for various autoimmune disorders by depleting B cells. However, its indications and safety in pediatric populations in our region remain insufficiently studied.

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Systemic mastocytosis (SM) is a rare hematologic condition characterized by the proliferation and accumulation in tissue of clonal mast cells in multiple organ systems. The release of mast cell mediators in the indolent disease type and the predominant mast cell infiltration of tissues in advanced disease contribute to the heterogeneous clinical presentation. The disease driver in >90% of adult cases is an activating mutation, with D816V being the most frequent.

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