NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,123 terms related to cancer and medicine.

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Philadelphia chromosome
(FIH-luh-DEL-fee-uh KROH-muh-some)
An abnormality of chromosome 22 in which part of chromosome 9 is transferred to it. Bone marrow cells that contain the Philadelphia chromosome are often found in chronic myelogenous leukemia and sometimes found in acute lymphocytic leukemia.