Omalizumab has demonstrated efficacy, increasing the tolerance threshold in patients with multiple food allergies, as well as reducing the risk of severe reactions when used as monotherapy. This favors improving the reactivity profile of patients with food allergy. In our setting, plant allergy caused by sensitization to panallergens such as lipid transfer proteins (LTPs) and profilins entails important limitations for the consumption of a healthy diet due to the extensive dietary restrictions.

The main objective of this project is to analyze the efficacy of treatment with omalizumab administered every 2-4/weeks, used in monotherapy in patients with plant allergy due to sensitization to profilin and LTPs and those patients in whom sublingual immunotherapy with Pru p 3 (peach LTP), has not been effective, by performing a before-after study we will evaluate the changes in clinical reactivity to LTP (peach) and profilin (melon) and the changes immunological effect after omalizumab intervention. In addition, we will evaluate the changes in reactivity to at least one food other than peach and melon in the different sensitization profiles.

Inclusion Criteria:

• Males or females aged 14-55 years who sign the informed consent (IC) for the study and Biobank sample storage.
• Allergy to plant foods due to sensitisation to LTP, patients allergic to profilin confirmed by a suggestive clinical history, positive skin tests and specific IgE to Pru p 3 (peach LTP) and Pho d 2 (Phoenix dactylifera profilin).
• Positive oral challenge test (OPT) to peach and at least one other food in patients allergic to LTP and positive oral challenge test to melon and at least one other food in patients allergic to profilin.
• Selection of a group of LTP-allergic individuals with therapeutic failure after treatment with ITSL-Pru p 3.

Exclusion Criteria:

• Pregnancy and lactation.
• Immunological diseases; treatment with immunomodulatory and/or blocking drugs.
• Mental illness, which makes it impossible to follow and adhere to treatment (e.g. major depression, psychosis, etc.).
• Severe atopic dermatitis according to SCORAD 5: FEV1<70% (this test will be carried out as a priority in patients with a previous diagnosis of asthma).
• Inflammation in the oral cavity with severe symptoms, as well as with oral surgery in the previous 7 days.
• Immunotherapy with pollens in the previous 2 years.
• Subjects unable to comply with the schedule of visits during the study, as well as due to the consumption of the food under investigation, for example, due to work difficulties.

Patients with allergy to plant foods due to sensitisation to LTP and profilin