At the end of the first month (±1 week) and at the end of the third month (±2 weeks), then every 3 months (±1 month) until the end of the first year, then every 6 months (±1 month) until the end of the second year, and then at any time the doctor thinks it is needed, you will have a bone marrow aspiration performed to check the status of the disease. This sample will also be used for cytogenetic testing and may also be used to measure how the level of BCR-ABL in your bone marrow.