IL4 and tuberculosis: In June 2012, a randomized, double-blind, placebo-controlled phase II clinical trial was performed to assess the safety and efficacy of blocking IL-4 with pascolizumab in patients with PTB receiving standard combination therapy (https://www.clinicaltrials.gov/ct2/show/NCT01638520?term=NCT01638520&cond=tuberculosis&draw=2&rank=1).