ICAM1 and leukemia: The analysis of the expression of adhesion molecules which could promote leukaemia–fibroblast interactions showed that the co‐culture of both cell types induced a significant increment in the expression levels of ITGA4 (VLA‐4) and ITGAL (LFA‐1) integrins in leukaemic cells and their ligands VCAM1 and ICAM1 in CP fibroblasts (Figure 3A–C).