title: Selective tropism of Seneca Valley virus for variant subtype small cell lung cancer.
abstract: We assessed the efficacy of Seneca Valley virus (SVV-001), a neuroendocrine cancer-selective oncolytic picornavirus, in primary heterotransplant mouse models of small cell lung cancer (SCLC), including three lines each of classic and variant SCLC. Half-maximal effective concentrations for cell lines derived from three variant heterotransplants ranged from 1.6×10(-3) (95% confidence interval [CI] = 1×10(-3) to 2.5×10(-3)) to 3.9×10(-3) (95% CI = 2.8×10(-3) to 5.5×10(-3)). Sustained tumor growth inhibition in vivo was only observed in variant lines (two-sided Student t test, P < .005 for each). Doses of 10(14) vp/kg were able to completely and durably eradicate tumors in a variant SCLC heterotransplant model in two of six mice. Gene expression profiling revealed that permissive lines are typified by lower expression of the early neurogenic transcription factor ASCL1 and, conversely, by higher expression of the late neurogenic transcription factor NEUROD1. This classifier demonstrates a sensitivity of .89, specificity of .92, and accuracy of .91. The NEUROD1 to ASCL1 ratio may serve as a predictive biomarker of SVV-001 efficacy.
authors.affiliation: Sidney Kimmel Compre hensive Cancer Center, Johns Hopkins University, Baltimore, MD 21231, USA.
authors.forename: J T
authors.initials: JT
authors.lastname: Poirier
authors.forename: Irina
authors.initials: I
authors.lastname: Dobromilskaya
authors.forename: Whei F
authors.initials: WF
authors.lastname: Moriarty
authors.forename: Craig D
authors.initials: CD
authors.lastname: Peacock
authors.forename: Christine L
authors.initials: CL
authors.lastname: Hann
authors.forename: Charles M
authors.initials: CM
authors.lastname: Rudin
mesh_terms: D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000032:analysis* / Q000235:genetics; D018288:Carcinoma, Small Cell / Q000737:chemistry / Q000628:therapy*; D045744:Cell Line, Tumor; D004195:Disease Models, Animal; D005260:Female; D020869:Gene Expression Profiling; D008175:Lung Neoplasms / Q000737:chemistry / Q000628:therapy*; D051379:Mice; D008815:Mice, Inbred Strains; D016513:Mice, SCID; D050504:Oncolytic Viruses; D010849:Picornaviridae; D011237:Predictive Value of Tests; D040081:Protein Array Analysis; D014183:Transplantation, Heterologous; D018523:Tropism
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; C065500:ASCL1 protein, human; C093970:NEUROD1 protein, human