Oblimersen

History

The antisense oligonucleotide drug oblimersen was developed by Genta Incorporated to target Bcl-2. An antisense DNA or RNA strand is non-coding and complementary to the coding strand (which is the template for producing respectively RNA or protein). An antisense drug is a short sequence of RNA which hybridises with and inactivates mRNA, preventing the protein from being formed.

It was shown that the proliferation of human lymphoma cells (with t(14;18) translocation) could be inhibited by antisense RNA targeted at the start codon region of Bcl-2 mRNA. In vitro studies led to the identification of oblimersen, which is complementary to the first 6 codons of Bcl-2 mRNA.

These have shown successful results in Phase I/II trials for lymphoma, and a large Phase III trial was launched in 2004.

By the first quarter 2010, the drug had not received FDA approval due to disappointing results in a melanoma trial. Although its safety and efficacy have not been established for any use, Genta Incorporated still claims on its website that studies are currently under way to examine the potential role of oblimersen in a variety of clinical indications.

Recent studies in 2023 continue to explore the potential of oblimersen in combination with other therapies. Preclinical models have demonstrated that oblimersen, when combined with vinorelbine, significantly inhibits tumor growth and prolongs survival in NSCLC. These findings suggest that combining oblimersen with other chemotherapeutic agents could enhance its efficacy and potentially overcome previous clinical challenges. https://aacrjournals.org/clincancerres/article/10/12/4245s/182143/Oblimersen-Sodium-Genasense-bcl-2-Antisense

References

References

1. (November 2002). "Potential roles of antisense oligonucleotides in cancer therapy. The example of Bcl-2 antisense oligonucleotides". European Journal of Pharmaceutics and Biopharmaceutics.
2. (June 2004). "Novel therapies for chronic lymphocytic leukemia". Blood Reviews.