In the liver, BS, CLL, and COR, a strong increase in the CYP1A2 mRNA levels (fold changes of 5.3 ± 0.8, 115.4 ± 20.5, 122.9 ± 32.9, and 132.3 ± 13.4, respectively) was observed at P14 compared with the levels at P7. Here, CYP1A2 is linked to B-cell chronic lymphocytic leukemia.