AKR1B1 and acute myeloid leukemia: In this study, we classified the 35 study participants according to the proposed Urayasu classification for AML as follows, based on the results shown in Figure 3 and Table 2: (1) Group 1 (n = 22; Favorable prognosis): Of the 35 patients, 22 (63%) showed the following IHC staining patterns: p53(-)/MRP1(-), and AKR1B10(+)/AKR1B1(+) or AKR1B10(-)/AKR1B1(-).