MYC and neoplasm: In contrast to the preceding findings, tumor cells obtained from Eμ-MYC/BCRHEL/sHEL mice or MMTV-rtTA/TRE-MYC/BCRHEL/sHEL mice would grow into lethal tumors when transplanted into recipient mice in the absence of HEL antigen (Figure 4A, 4C, and 4F).