ATF1 and acute myeloid leukemia: Likewise, the expression of two K562-associated C1-FFLs (ZNF263-USF1-UBA52 and MYC-ATF1-UBA52) was positively associated with the longer overall survival of AML patients (P-value = 9.5e−3 and 9.4e−3, respectively, Fig. 6c).