MYC and neoplasm: In contrast, in neoplasms dependent on the myelocytomatosis oncogene (Myc), Harvey rat sarcoma viral oncogene 1 (Hras), and SV40 T antigen (SV40-TAg) transgenes, myoepithelial differentiation is an important event in the specific type of tumor progression characterized by epithelial to mesenchymal transition (EMT).