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cMyc protein is a transcription factor localized to the nucleus of the cell. Amplification of the cMyc gene has been found in several types of human tumors. cMyc is amplified in 20-30% of breast cancer cases and is associated with HER-2 amplification and poor outcome. In Burkitt's lymphoma, 90% of tumors have translocation of cMyc or variants. cMyc protein (>40%) is seen in a subset of cases of diffuse large B-cell lymphoma (DLBCL) and is correlated with Myc rearrangement. It is also positive in radiation-associated angiosarcoma.