Cytogenetic and molecular analysis of each patient's leukemia cells has become an essential component of diagnosis prior to treatment. It has furthered our understanding of leukemogenesis at a molecular level. Specific and well-characterized recurring chromosomal abnormalities facilitate diagnosis, confirm subtype classification, and have major prognostic value for treatment planning. Conventional chromosome analysis is a basic way for diagnosis and treatment. In addition in this way evaluation

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... of disease progression is important and so it is the only method that can identify the presence of clonal evolution, particularly in accelerated and relapse phase in the disease. Also conventional cytogenetic can detect chromosomal abnormality associated with its advanced phase. Anyhow, the value of translocation rates in interphase and metaphase nuclei in monitoring leukemia is at the time of diagnosis and after treatment additionally. Genomic profiling transformed our understanding of the genetic basis of leukemia particularly in acute leukemia, which is a malignant clonal proliferation in lymphoid stem cells or myeloid progenitor cells.