Stromal co‐culture of primary CLL cells resulted in up‐regulation of MCL1, BCL2 and BCLxL, with concomitant decreased expression of NOXA, BAX and PUMA (in at least two of the three samples analysed), compared to cells cultured in medium alone (Figure 4A). The gene discussed is MCL1; the disease is B-cell chronic lymphocytic leukemia.