On Day 1 of Cycles 4, 7, and every 6th cycle after that (Cycles 13, 19, 25, and so on), you will have a bone marrow aspiration or biopsy to check the status of the disease. On Day 1 of Cycle 4, the bone marrow aspiration/biopsy will also look at the genes and chromosomes of the leukemia cells. If there is not enough information from the biopsy/aspirate, leftover blood will be used to look at this gene and chromosome information.