Background Immunotherapy with the SQ-standardized grass tablet Grazax is efficacious and well-tolerated in adult patients with rhinoconjunctivitis. Allergic asthma and rhinoconjunctivitis are closely linked, and a strategy combining treatment of the upper and lower airways is recommended. Objective To investigate the efficacy of treatment with the grass tablet on grass pollen–induced rhinoconjunctivitis and asthma as well as the immunologic response and the safety profile in children. Methods A total of 253 children age 5 to 16 years, with grass pollen–induced rhinoconjunctivitis with/without asthma, were randomized 1:1 to active treatment or placebo. Treatment was initiated 8 to 23 weeks before the start of the grass pollen season 2007 and continued throughout the entire season. Symptomatic medication was provided as relief medication to both groups in a stepwise fashion. Primary endpoints were rhinoconjunctivitis symptom and medication scores. Results The rhinoconjunctivitis symptom and medication scores and the asthma symptom score were all statistically significantly different between the 2 treatment groups. The differences in medians relative to placebo were 24%, 34%, and 64% in favor of active treatment. The immunologic response was similar to that observed in adults. The most common adverse reaction was oral pruritus, reported by 40 subjects (32%) in the active and 3 (2%) in the placebo group. Six subjects withdrew because of adverse events. No serious adverse events were assessed as treatment-related. Conclusion Immunotherapy with the grass tablet reduced grass pollen–induced rhinoconjunctivitis and asthma symptoms in a pediatric population and introduced an immunomodulatory response, consistent with treatment of the underlying allergic disease. The treatment was well tolerated.
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