What are the mechanisms of action of allergen-specific immunotherapy (ITAE)?

ITAE aims to decrease hypersensitivity to substances that cause allergic reactions.
ITAE can produce relief or cure of symptoms in a long-lasting way after treatment.
ITAE can only be administered by subcutaneous injection.
ITAE does not modify the immune response to allergens.
ITAE can increase the production of IgE antibodies.