By a News Reporter-Staff News Editor at Cancer Gene Therapy Week -- Current study results on Biotechnology have been published. According to news originating from Houston, Texas, by NewsRx correspondents, research stated, "A phase I-II study to evaluate gene-mediated cytotoxic immunotherapy in newly diagnosed prostate cancer before radical prostatectomy was conducted in Monterrey, Mexico. First, to investigate delivery of adenovirus to the prostate, fluorescently labeled vector was injected into fresh prostatectomy specimens and distribution was visually analyzed."
Our news journalists obtained a quote from the research from Methodist Hospital, "The optimal volume and site instillation was then used for transrectal ultrasound guided intraprostatic injection in 10 patients with adenocarcinoma scheduled for radical prostatectomy. Each received two apical and two basal 0.5 ml injections of AdV-tk for a total of 1 x 10(11) vp followed by 14 days of prodrug. Nine patients continued to tumor resection: six high risk, one intermediate and two low risk. In vivo vector distribution was analyzed from the resected tissue of four patients. Patients were monitored for tumor progression and acute and long-term safety. For vector delivery, two apical and two basal injections of 0.5 ml led to optimal organ-wide distribution ex vivo and in vivo. Cytotoxicity was evidenced by transient rise in PSA and tumor histology. There were no significant adverse events deemed related to the treatment and no late toxicities after median follow-up of 11.3 years. All six high-risk patients had positive surgical margins and one had seminal vesicle involvement. Despite slow PSA rise post surgery in three of these patients, none developed metastases. The intermediate-and low-risk patients had complete resections and none have progressed."
According to the news editors, the research concluded: "In vivo transrectal ultrasound guided instillation of an adenoviral vector into four sites in the prostate was practical as an outpatient procedure, well tolerated and led to distribution throughout the intraprostatic tumor mass. AdV-tk demonstrated no significant acute or late toxicities. Trends in PSA and disease progression conveyed the possibility of a sustained immune response against residual disease."
For more information on this research see: Intraprostatic distribution and long-term follow-up after AdV-tk immunotherapy as neoadjuvant to surgery in patients with prostate cancer. Cancer Gene Therapy, 2013;20(11):642-649. Cancer Gene Therapy can be contacted at: Nature Publishing Group, Macmillan Building, 4 Crinan St, London N1 9XW, England. (Nature Publishing Group - www.nature.com/; Cancer Gene Therapy - www.nature.com/cgt/)
The news correspondents report that additional information may be obtained from A. Rojas-Martinez, Methodist Hosp, Dept. of Radiat Oncol, Houston, TX 77030, United States. Additional authors for this research include A.G. Manzanera, S.W. Sukin, J. Esteban-Maria, J.F. Gonzalez-Guerrero, L. Gomez-Guerra, R. Garza-Guajardo, J.P. Flores-Gutierrez, G.E. Riojas, I. Delgado-Enciso, R. Ortiz-Lopez, L.K. Aguilar, E.B. Butler and H Barrera-Saldana (see also Biotechnology).
Keywords for this news article include: Biotechnology, Texas, Houston, Surgery, Oncology, United States, Immunotherapy, Prostate Cancer, Immunomodulation, Cancer Gene Therapy, Prostatic Neoplasms, North and Central America
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