My child was diagnosed with acute B-cell leukemia with an 84% blast rate. They underwent chemotherapy in the hospital for over a year, with the blast rate reduced to 2%. They then continued with daily oral chemotherapy for two years. A recent bone marrow aspirate (MRD) showed a result of 0.07%. The doctor said the treatment regimen is complete and they are now monitoring the child. I am worried and would appreciate advice on what the next course of treatment should be.