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Oblimersen in the treatment of metastatic melanoma
Ahmad A Tarhini1, John M Kirkwood
1Melanoma & Skin Cancer Program, University of Pittsburgh School of Medicine, UPCI UPMC Cancer Pavilion, 5150 Centre Avenue, Pittsburgh, PA 15232, USA. tarhiniaa@upmc.edu
Abstract:
Oblimersen (Genasense is a Bcl-2 antisense compound that selectively targets Bcl-2 RNA for degradation by RNase H and thereby decreases Bcl-2 protein production. Bcl-2 protein plays a major role in preventing apoptosis and has been linked to chemotherapy resistance in melanoma. Preclinical studies with oblimersen in melanoma cell lines and xenograft models of melanoma have demonstrated downregulation of Bcl-2 protein, induction of apoptosis and enhanced tumor response when combined with chemotherapy. Results of a Phase I/II study have shown that reducing Bcl-2 with oblimersen coincident with the administration of dacarbazine may amplify apoptosis and improve therapeutic outcome. A subsequent Phase III trial showed that the addition of oblimersen to dacarbazine significantly improved multiple clinical outcomes relative to dacarbazine alone based on an intent-to-treat analysis of progression-free survival and response rate (overall, complete and durable), as well as overall survival in patients with normal lactate dehydrogenase. This article reviews the biochemistry, pharmacodynamics and pharmacokinetics, safety and efficacy data related to oblimersen in melanoma.
Insights
Oblimersen, an antisense compound targeting Bcl-2, significantly improved melanoma treatment outcomes when combined with dacarbazine chemotherapy. This combination therapy enhanced apoptosis and clinical benefits, including overall survival in select patients.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Bcl-2 protein prevents apoptosis and is implicated in melanoma chemotherapy resistance.
- Oblimersen is a Bcl-2 antisense compound designed to reduce Bcl-2 protein levels.
- Preclinical studies indicated oblimersen's potential to enhance chemotherapy efficacy in melanoma.
Purpose of the Study:
- To review the scientific data supporting oblimersen's use in melanoma treatment.
- To summarize the biochemistry, pharmacodynamics, pharmacokinetics, safety, and efficacy of oblimersen.
- To evaluate the clinical outcomes of oblimersen in combination with dacarbazine.
Main Methods:
- Review of preclinical studies in melanoma cell lines and xenograft models.
- Analysis of Phase I/II clinical trial data combining oblimersen with dacarbazine.
- Evaluation of Phase III clinical trial results comparing oblimersen plus dacarbazine versus dacarbazine alone.
Main Results:
- Oblimersen demonstrated Bcl-2 protein downregulation, apoptosis induction, and enhanced tumor response in preclinical models.
- Phase I/II studies suggested improved therapeutic outcomes with oblimersen and dacarbazine.
- Phase III trial showed significant improvements in progression-free survival, response rates, and overall survival (in patients with normal LDH) with the combination therapy.
Conclusions:
- Oblimersen, by targeting Bcl-2, offers a promising strategy to overcome chemotherapy resistance in melanoma.
- Combination therapy with oblimersen and dacarbazine demonstrates significant clinical benefits in melanoma patients.
- Further review of oblimersen's comprehensive data supports its role in melanoma treatment strategies.
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