Meta-analysis of studies according to del11q23 status by FISH. Forest plot of studies reporting (A) progression-free survival (PFS) according to del11q23 status by FISH, and (B) overall survival (OS) according to del11q23 status by FISH. df, degree of freedom; IV, inverse variance; Random, random-effects model; SE, standard error; Z, Z value. Dohner and collegues⁷  and Krober and collegues¹⁷  report on the influence of FISH on OS among the same group of patients (n = 325). For the purposes of this meta-analysis, we included data reported by Krober and colleagues only.