WT1 and acute myeloid leukemia: Bergmann et al. showed that high levels of WT1 mRNA in AML were associated with poor long term outcome (Bergmann et al. 1997; Trka et al. 2002) while others have found no correlation (Gaiger et al. 1998; Greiner et al. 2006; Schmid et al. 1997; Yanada et al. 2004).