This was a multicenter, uncontrolled, open-label, special drug use study to investigate the safety and efficacy of Xolair by collecting data in its clinical setting in patients with severe to most severe seasonal allergic rhinitis aged ≥ 12 years and \< 18 years whose symptoms were inadequately controlled despite to conventional therapies and used Xolair.
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Proportions of patients with Adverse events (AEs), Serious AEs, AEs leading to discontinuation of Xolair treatment, Adverse drug reactions (ADRs), Serious ADRs, ADRs leading to discontinuation of Xolair treatment
Timeframe: up to 24 weeks