Answer
They check blood-cell counts and liver function because treatment can reduce neutrophils, red cells and platelets, while impaired liver clearance can increase toxicity.
Sources for this answer
- Irinotecan Hydrochloride 20 mg/ml concentrate for solution for infusion — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.