IL6 and acute myeloid leukemia: Consistent with this finding, high-IL6/R pAML BM samples are > 2-fold enriched for the French-American-British (FAB) M4 and M5 and WHO “AML, not otherwise categorized: Acute monoblastic/acute monocytic leukemia” and “AML, not otherwise categorized: Acute monoblastic/acute monocytic leukemia” classification categories (Fisher’s Exact Test P = 3.9E−20, odds ratio 3.76, 95% confidence interval: 2.8, 5.0, comparing high-IL6/R samples (n = 287) to all other AAML1031 donors (n = 1063)).