CGTG-102

CGTG-102 (Ad5/3-D24-GMCSF),[1] (developed by Oncos Therapeutics) is an oncolytic adenovirus currently in orphan drug status for soft tissue sarcomas.

Mechanism of action

It is modified to selectively replicate in p16/Rb-defective cells, which include most human cancer cells. In addition, CGTG-102 codes for the granulocyte–macrophage colony-stimulating factor (GM-CSF),[2][3] a potent immunostimulatory molecule.

The therapeutic potential of oncolytic virotherapy is not a simple consequence of the cytopathic effect but strongly relies on the induction of an endogenous immune response against transformed cells.[2][4] Superior anticancer effects have been observed when oncolytic viruses are engineered to express (or be co-administered with) immunostimulatory molecules such as GM-CSF.[2]

Clinical trials

While the CGTG-102 oncolytic adenovirus has shown efficacy as a single agent against several soft tissue sarcomas, it would also be appealing to use in combination with other regimes, as oncolytic viruses have demonstrated very little overlap in side effects with traditional therapies such as chemotherapy and radiation.[2][4] CGTG-102 has recently been studied in combination with doxorubicin, and a synergistic effect was observed.[5] At least part of doxorubicin’s mechanism of action is as an inducer of immunogenic cell death, and it has been suggested that immune response contributes to its overall anti-tumor activity. Doxorubicin has been shown to increase adenoviral replication in soft tissue sarcoma cells as well,[5] potentially contributing to the observed synergistic effect in the virus/doxorubicin combination.

While in phase I was already used to treat 200 advanced cancer patients in the company's Advanced Therapy Access Program.[6]

References

  1. ↑ "Oncos.net".
  2. 1 2 3 4 Hemminki, Akseli (2014). "Oncolytic Immunotherapy: Where Are We Clinically?". Scientifica 2014: 862925. doi:10.1155/2014/862925. PMC 3914551. PMID 24551478.
  3. ↑ Bramante, Simona; Koski, Anniina; Kipar, Anja; Diaconu, Iulia; Liikanen, Ilkka; Hemminki, Otto; Vassilev, Lotta; Parviainen, Suvi; Cerullo, Vincenzo; Pesonen, Saila K; Oksanen, Minna; Heiskanen, Raita; Rouvinen-Lagerström, Noora; Merisalo-Soikkeli, Maiju; Hakonen, Tiina; Joensuu, Timo; Kanerva, Anna; Pesonen, Sari; Hemminki, Akseli (2014). "Serotype chimeric oncolytic adenovirus coding for GM-CSF for treatment of sarcoma in rodents and humans". International Journal of Cancer 135 (3): 720–30. doi:10.1002/ijc.28696. PMID 24374597.
  4. 1 2 Pol, Jonathan G; Rességuier, Julien; Lichty, Brian D (2012). "Oncolytic viruses: a step into cancer immunotherapy". Virus Adaptation and Treatment 4: 1–21. doi:10.2147/VAAT.S12980.
  5. 1 2 Siurala, Mikko; Bramante, Simona; Vassilev, Lotta; Hirvinen, Mari; Parviainen, Suvi; Tähtinen, Siri; Guse, Kilian; Cerullo, Vincenzo; Kanerva, Anna; Kipar, Anja; Vähä-Koskela, Markus; Hemminki, Akseli (2015). "Oncolytic adenovirus and doxorubicin-based chemotherapy results in synergistic antitumor activity against soft-tissue sarcoma". International Journal of Cancer 136 (4): 945–54. doi:10.1002/ijc.29048. PMID 24975392.
  6. ↑ "Oncolytic viruses mediating anti-tumor immunity in human cancer patients" (Press release). Oncos Therapeutics. 19 May 2010.
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