MKI67 and acute myeloid leukemia: Zorzoli and others (2012) reported antiproliferative activity of IL-27 on purified primary AML cells measured by intracellular staining Ki67, a nuclear marker for proliferation, whereas we determined growth stimulation of IL-27 as dose–response relationships of IL-27 with 3H-thymidine incorporation in leukemic cell lines.