Abstract:
:In spite of preclinical efficacy and recent randomized, controlled studies with adenoviral vectors expressing herpes simplex virus-1 thymidine kinase (HSV1-TK) showing statistically significant increases in survival, most clinical trials using single therapies have failed to provide major therapeutic breakthroughs. Because glioma is a disease with dismal prognosis and rapid progression, it is an attractive target for gene therapy. Preclinical models using microscopic brain tumor models (e.g., < or =0.3 mm3) may not reflect the pathophysiology and progression of large human tumors. To overcome some of these limitations, we developed a syngeneic large brain tumor model. In this model, administration of single therapeutic modalities, either conditional cytotoxicity or immunostimulation, fail. However, when various immunostimulatory therapies were delivered in combination with conditional cytotoxicity (HSV1-TK), only the combined delivery of fms-like tyrosine kinase ligand (Flt3L) and HSV1-TK significantly prolonged the survival of large tumor-bearing animals (> or =80%; P < or = 0.005). When either macrophages or CD4+ cells were depleted before administration of viral therapy, TK + Flt3L therapy failed to prolong survival. Meanwhile, depletion of CD8+ cells or natural killer cells did not affect TK + Flt3L efficacy. Spinal cord of animals surviving 6 months after TK + Flt3L were evaluated for the presence of autoimmune lesions. Whereas macrophages were present within the corticospinal tract and low levels of T-cell infiltration were detected, these effects are not indicative of an overt autoimmune disorder. We propose that combined Flt3L and HSV1-TK adenoviral-mediated gene therapy may provide an effective antiglioma treatment with increased efficacy in clinical trials of glioma.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Ali S,King GD,Curtin JF,Candolfi M,Xiong W,Liu C,Puntel M,Cheng Q,Prieto J,Ribas A,Kupiec-Weglinski J,van Rooijen N,Lassmann H,Lowenstein PR,Castro MGdoi
10.1158/0008-5472.CAN-04-3434subject
Has Abstractpub_date
2005-08-15 00:00:00pages
7194-204issue
16eissn
0008-5472issn
1538-7445pii
65/16/7194journal_volume
65pub_type
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