Abstract | PURPOSE: EXPERIMENTAL DESIGN: MetXia-P450 was directly injected into metastatic cutaneous tumor nodules on days 1 and 2 and nodules biopsied on day 7. Oral cyclophosphamide (100 mg/m(2)) was administered between days 8 and 22. Subsequent cycles of oral cyclophosphamide were repeated for 2 of 4 weeks. Gene transfer levels in biopsy samples were measured by histologic and quantitative PCR analyses. Safety assessments were made using PCR for vector dissemination to the blood after injection and using PCR and serologic analyses to detect replicating virus. Secondary end points included clinical response, toxicity, and evaluation of antitumor immune responses by measurement of carcinoembryonic antigen and 5T4 antibodies. RESULTS: Twelve patients with breast cancer (n = 9) and melanoma (n = 3) received three dose levels of MetXia-P450 ( approximately 8 x 10(5), approximately 8 x 10(6), and approximately 8 x 10(7) lacZ transferring units/mL). The product was safe and well tolerated. The lacZ transgene was detected in biopsy material by immunohistochemistry in 10 of 12 patients and integrated viral sequences by PCR in 3 of 6 patients. One (8%) patient with breast cancer had a partial response and received 7 months of oral cyclophosphamide. Four (33%) patients had stable disease for > or =3 months and the rest had progressive disease. Preliminary immunologic analyses were suggestive of an antitumor response in two patients (partial response in one patient and stable disease in one patient). CONCLUSION: MetXia was safe and well tolerated. Gene transfer was detected at all dose levels, and the initial suggestion of an antitumor response indicates that MetXia-P450 should undergo further clinical assessment.
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Authors | Jeremy P Braybrooke, Andrew Slade, Gael Deplanque, Richard Harrop, Srinivasan Madhusudan, Martin D Forster, Rachel Gibson, Andreas Makris, Denis C Talbot, Jan Steiner, Linda White, On Kan, Stuart Naylor, Miles W Carroll, Sue M Kingsman, Adrian L Harris |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 11
Issue 4
Pg. 1512-20
(Feb 15 2005)
ISSN: 1078-0432 [Print] United States |
PMID | 15746054
(Publication Type: Clinical Trial, Clinical Trial, Phase I, Journal Article)
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Chemical References |
- Antineoplastic Agents, Alkylating
- Carcinoembryonic Antigen
- Mucin-1
- Cyclophosphamide
- Aryl Hydrocarbon Hydroxylases
- CYP2B6 protein, human
- Cytochrome P-450 CYP2B6
- Oxidoreductases, N-Demethylating
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Topics |
- Administration, Oral
- Adult
- Aged
- Antineoplastic Agents, Alkylating
(administration & dosage, metabolism, therapeutic use)
- Aryl Hydrocarbon Hydroxylases
(genetics, metabolism)
- Breast Neoplasms
(genetics, immunology, therapy)
- Carcinoembryonic Antigen
(analysis)
- Cell Line, Tumor
- Cyclophosphamide
(administration & dosage, metabolism, therapeutic use)
- Cytochrome P-450 CYP2B6
- Enzyme-Linked Immunosorbent Assay
- Female
- Genetic Therapy
(methods)
- Genetic Vectors
(administration & dosage, genetics)
- Humans
- Immunohistochemistry
- Male
- Melanoma
(genetics, immunology, therapy)
- Middle Aged
- Mucin-1
(analysis)
- Oxidoreductases, N-Demethylating
(genetics, metabolism)
- Time Factors
- Treatment Outcome
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