Publication 2/15/2004 Combined 5-fluorouracil/systemic interferon-beta gene therapy results in long-term survival in mice with established colorectal liver metastases. Choi EA, Lei H, Maron DJ, Mick R, Barsoum J, Yu QC, Fraker DL, Wilson JM, Spitz FR Clinical Cancer Research : An Official Journal Of The American Association For Cancer Research