HOXA4 and acute myeloid leukemia: The results indicated that the expression levels of HOXA2, HOXA3, HOXA4, HOXA5, HOXA6, HOXA7, HOXA9, and HOXA10 were significantly increased in human AML patients compared to those in normal samples (P < 0.05), whilst the expression levels of HOXA1, HOXA11, and HOXA13 were not significantly different (Figure 2).