Quantification of immunoblotting of case 2 showed that CDK9 inhibition caused a loss of 38% of phospho‐RNA pol‐II (Ser‐2) in comparison with total RNA pol‐II, and a loss of 23% of MCL‐1 protein in comparison with β‐actin in the primary MCL cells (Figure 3C). The gene discussed is MCL1; the disease is mantle cell lymphoma.