The Effect of Xolair ® (Omalizumab) in Mastocytosis Patients

Patients with mastocytosis often suffer from associated symptoms such as nausea, vertigo, fatigue, urticaria, abdominal cramps, diarrhea or hypotension due to release of mediators by mast cells. These patients have also an increased frequency of anaphylactic/anaphylactoid reactions due to allergens such as hymenoptera or nonspecific stimuli such as contrast media, local anesthetics or analgesics. In addition, there is increased osteoporosis in mastocytosis patients due to the activity of mast cell mediators on osteoblasts and osteoclasts. Symptoms of mastocytosis respond poorly to treatment with antihistamines or other antiallergic drugs. There is currently no specific treatment for this disease with the exception of rare cases. There are, however, some case reports suggesting that omalizumab might decrease symptoms including hypotensive events. The aim of the study is to investigate whether patients suffering from mastocytosis benefit from a 6 month course of omalizumab with regard to symptoms and quality of life and whether the applied in vitro and in vivo monitoring tools represent useful surrogate markers for the efficacy of omalizumab in patients with mastocytosis. * Trial with medicinal product

Sex

All

Minimum age

18 Years

Maximum age

70 Years

Inclusion criteria:

* Histological proven mastocytosis (cutaneous or systemic);
* Diagnosis made by one marrow unction and/or skin biopsy or other histological work up;
* Age: 18-70 years

Exclusion criteria

* Age \<18 years;
* Known hypersensitivity to omalizumab or any of its components;
* History of cancer in previous 5 years;
* Patients with serious infections;
* Patients with active tuberculosis or undergoing anti-TB therapy;
* Patients currently treated with systemic immunosuppressive agents;
* Female patients who are pregnant or breast feeding;Contraception must be performed by a save reliable and accept method such as oral or implanted contraceptives, intravaginal or male preservatives or permanent methods such as tubal ligation.
* Patients with known positivity for human immunodeficiency virus (HIV). HIV screening will be performed by an HIV 1/2 Antibody-detection test.

Note: Specific immunotherapy for insect sting allergy is no exclusion criteria.