Safety & Efficacy of NV1020 in Colorectal Cancer Metastatic to the Liver

Inclusion Criteria: 1. Ability to understand and willingness to sign a written informed consent (includes willingness to avoid physical intimacy during and for 2 weeks post NV1020 treatment) 2. 18 years or more of age 3. Colorectal adenocarcinoma histologically confirmed within one year prior to enrollment in the study 4. Liver dominant metastases (CT-measurable lesions with less than 50% total liver involvement), histologically confirmed 5. Failed conventional chemotherapy for metastatic disease (e.g. tumors no longer responding to 5-FU/leucovorin in combination with irinotecan or oxaliplatin with or without one monoclonal antibody) 6. Candidate for additional chemotherapy (and/or experimental anti-cancer therapy, if this is the only remaining treatment option) 7. Karnofsky Performance Status 70% or greater 8. Life expectancy greater than or equal to 4 months, based on the investigator's opinion 9. Seropositive for herpes simplex virus-1 (HSV-1) 10. Fecund females: negative for pregnancy test (urine or serum) 11. Effective double-barrier contraception for a minimum of 2 months following final infusion of NV1020 Exclusion Criteria: 1. Dominant extrahepatic disease, including cerebral metastases, significant malignant ascites or other extrahepatic metastases that are symptomatic, in critical locations or otherwise likely to confound NV1020 evaluations, in the opinion of the investigator 2. Seronegative for HSV-1 3. Significant active/unstable non-malignant disease or laboratory test (hematology and chemistry) results that meet any of the following: * White blood cell count (WBC) less than or equal to 3 x 10e3/mm3 * Absolute neutrophil count (ANC) less than or equal to 1.5 x 10e3/mm3 * Platelets less than or equal to 100,000/mm3 * Hemoglobin (Hgb) less than or equal to 9.0 g/dL * Prothrombin time/partial thromboplastin time (PT/PTT) \> upper limit of normal (ULN) * Serum creatinine \> 2.0 mg/dL * Aspartate aminotransferase (AST) or alanine aminotransferase (ALT) \> 2.5 times ULN or total bilirubin \> 1.5 times ULN * Alkaline phosphatase \> 2.5 times ULN 4. Chemotherapy \< 4 weeks prior to the first NV1020 infusion (mitomycin or nitrosurea \< 6 weeks) 5. Immunotherapy \< 6 weeks prior to the first NV1020 infusion 6. Radiotherapy (external or internal) to the liver 7. Major surgery (excluding pump placement and cholecystectomy) ≤ 2 weeks prior to the first NV1020 infusion but the subject must be clinically stable. Pump placement and cholecystectomy ≤ 1 week prior to the first NV1020 infusion but the subject must be clinically stable 8. Female who is pregnant or nursing 9. Patients wishing to conceive within 2 months after the last infusion of NV1020 10. Any investigational agent administered less than or equal to 4 weeks prior to NV1020 infusion 11. Acute HSV infection requiring systemic antiviral therapy or history of serious HSV infection (e.g., ocular, encephalitic, etc.) 12. Active viral hepatitis (evidence for infection with hepatitis A, B or C viruses) 13. Known infection with HIV 14. Known hypersensitivity to any component of the NV1020 formulation 15. History of, or current, bleeding or coagulation disorder 16. History of significant hepatic fibrosis, cirrhosis, or hemachromatosis 17. History of malignancy other than colorectal cancer, within 5 years prior to start of study participation, with the exception of in situ cervical or skin carcinoma 18. Active severe infection and any other concurrent disease or medical conditions that are likely to interfere with the study, as judged by the investigator 19. Systemic corticosteroid administration \< 4 weeks prior to starting NV1020 treatment 20. Prior treatment with NV1020 or other putative oncolytic viruses