Abstract
Allergic rhinoconjunctivitis is a global health problem. Different allergen immunotherapy regimes are marketed but have low adherence because they are expensive, complex, and time-consuming. New allergen immunotherapy forms are needed. In a 3-year follow-up double-blind randomized placebo-controlled trial, we aimed to investigate the effect of intralymphatic allergen immunotherapy (ILIT). Patients with grass pollen rhinoconjunctivitis were treated with 3 ILIT injections and an ILIT booster 1 year later, 3 ILIT injections and a placebo booster, or 3 placebo injections and a placebo booster. Primary outcome was improvement in a combined symptom and medication score (cSMS). A novel evaluation tool with a linear regression model of cSMS and grass pollen counts was developed. Secondary outcomes were changes in grass specific immunoglobulins and skin and nasal provocation tests to grass pollen. A total of 36 patients were included. Log10-transformed cSMS was reduced by 0.30 (95% CI, 0.11-0.49; P = .002), equaling 48.5% (95% CI, 24.5%-62%), in the entire 3-year follow-up period, significant only in the first follow-up season but not in the second and third seasons. The regression model showed a 37% (P < .001) reduction in cSMS. The bo...Continue Reading
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