“…Our prior review provided strong evidence for the short-term (16 weeks to 1 year) effectiveness of omalizumab, and emergent yet still tentative evidence that the effectiveness may extend up to 2 to 4 years. This present review firmly establishes the short-term effectiveness of omalizumab at 16 weeks and 1 year, and provides strong evidence of its long-term effectiveness: seven studies reported outcomes at 2 years [37,39,43,45,60,70,76], seven studies at 3 years or more [36,47,58,63,64,66,70,73], one study at 4 years [36], and one study with a mean follow-up of 60.7 months followed patients for as long as 121 months [66]. Thus, our review provides strong evidence on the major outcomes of interest for up to 2 to 4 years; and emergent evidence reaching well beyond 4 years.…”