TMPRSS11D and acute myeloid leukemia: In RT‐PCR analysis of TTSP expression in human hematological cancer cells, we detected HAT‐L4 mRNA expression in AML–derived HEL, SHI‐1 and THP‐1 cells and CML–derived KU‐812, MEG‐01 and K562 cells (Figure 1A).