Gendicine
{{Short description|Gene therapy medication}}
{{Use dmy dates|date=June 2023}}
{{Primary sources|date=June 2018}}
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Gendicine is a gene therapy medication used to treat patients with head and neck squamous cell carcinoma linked to mutations in the TP53 gene. It consists of recombinant adenovirus engineered to code for p53 protein (rAd-p53) and is manufactured by Shenzhen SiBiono GeneTech.
Gendicine was the first gene therapy product to obtain regulatory approval for clinical use in humans{{cite journal | vauthors = Zhang WW, Li L, Li D, Liu J, Li X, Li W, Xu X, Zhang MJ, Chandler LA, Lin H, Hu A, Xu W, Lam DM | display-authors = 6 | title = The First Approved Gene Therapy Product for Cancer Ad-p53 (Gendicine): 12 Years in the Clinic | journal = Human Gene Therapy | volume = 29 | issue = 2 | pages = 160–179 | date = February 2018 | pmid = 29338444 | doi = 10.1089/hum.2017.218 | doi-access = free }} after Chinese State Food and Drug Administration approved it in 2003.{{cite journal | vauthors = Pearson S, Jia H, Kandachi K | title = China approves first gene therapy | journal = Nature Biotechnology | volume = 22 | issue = 1 | pages = 3–4 | date = January 2004 | pmid = 14704685 | pmc = 7097065 | doi = 10.1038/nbt0104-3 }} As of 2024, Gendicine has not been approved for use in the United States and the European Union.
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Mechanism of action
Gendicine enters the tumour cells by way of receptor-mediated endocytosis and begins to over-express genes coding for the p53 protein needed to fight the tumour.{{Cite journal|url = http://www.biopharminternational.com/genesis-gendicine-story-behind-first-gene-therapy|title = The Genesis of Gendicine: The Story Behind the First Gene Therapy|date = May 1, 2004|journal = Biopharm International| vauthors = Peng Z | series=BioPharm International-05-01-2004 | volume=17 | issue=5 }} Ad-p53 seems to act by stimulating the apoptotic pathway in tumour cells, which increases the expression of tumour suppressor genes and immune response factors (such as the ability of natural killer (NK) cells to exert "bystander" effects). It also decreases the expression of multi-drug resistance, vascular endothelial growth factor and matrix metalloproteinase-2 genes and blocking transcriptional survival signals.
p53 mutation status of the tumour cells and response to Ad-p53 treatment are not closely correlated.{{cite journal | vauthors = Peng Z | title = Current status of gendicine in China: recombinant human Ad-p53 agent for treatment of cancers | journal = Human Gene Therapy | volume = 16 | issue = 9 | pages = 1016–1027 | date = September 2005 | pmid = 16149900 | doi = 10.1089/hum.2005.16.1016 }} Ad-p53 appears to act synergistically with conventional treatments such as chemo- and radiotherapy. This synergy still exists in patients with chemotherapy and radiotherapy-resistant tumors. Gendicine produces fewer side effects than conventional therapy.
Related development
Contusugene ladenovec (Advexin), a similar gene therapy developed by Introgene that also uses adenovirus to deliver the p53 gene, was turned down by the FDA in 2008{{cite journal | vauthors = Osborne R | title = Ark floats gene therapy's boat, for now | journal = Nature Biotechnology | volume = 26 | issue = 10 | pages = 1057–1059 | date = October 2008 | pmid = 18846056 | doi = 10.1038/nbt1008-1057 | s2cid = 74421879 }} and withdrawn by the maker from the EMA approval shortly after.{{cite web | work = European Medicines Agency |title=Advexin: Withdrawal of the marketing authorisation application |url=https://www.ema.europa.eu/en/medicines/human/withdrawn-applications/advexin | date = 11 February 2009 |access-date=9 August 2020}}