Interestingly, 2 cycles of intracranial TRAIL combined with systemic G-TPP suppress the growth of established glioblastomas, with no significant animal weight loss throughout treatment. Analysis of brain sections from these mice, but not single agent-treated animals, show loss of tumor cell proliferation, internucleosomal DNA fragmentation, and caspase-3 activity, consistent with extensive activation of apoptosis in vivo^[1].