Abstract
Purpose
Oblimersen is an 18-base oligodeoxynucleotide encoding antisense to the gene for bcl-2, an anti-apoptotic protein that is upregulated in renal and other cancers. This study was designed to evaluate the combination of oblimersen with α-Interferon in advanced renal cancer. Trial endpoints were antitumor efficacy and toxicity, pharmacokinetics, and evidence of apoptosis in peripheral blood mononuclear cells.
Methods
Patients with measurable advanced renal cancer and 0–1 prior therapy were eligible. Treatment consisted of oblimersen, 7 mg/kg/day, as a continuous intravenous infusion 7 days of every 14 day cycle, plus α-IFN, 5 million units/m2 subcutaneously, days 4 and 6 of the first oblimersen infusion, then thrice weekly. Blood for laboratory correlates was collected before treatment, during oblimersen, and during therapy with both agents.
Results
Twenty-three patients were enrolled, five of whom had prior systemic therapy (three with prior high-dose interleukin-2). The median number of treatment cycles was 4 (range 1–12). One patient had a partial response lasting 2.5 months. The Grade 3–4 toxicities were fatigue, fever, myelosuppression, hepatic enzyme and metabolic abnormalities. Laboratory analyses of CD3+ lymphocyte apoptotic markers demonstrated no change between pre-treatment and on-treatment levels of bcl-2 or Annexin/PI positivity by flow cytometry. Mean oblimersen steady-state plasma concentration and clearance was 2.3 ± 0.9 μg/ml and 0.15 ± 0.07 l/h/kg, respectively.
Conclusions
Oblimersen given in this dose and schedule with α-IFN does not appear sufficiently active to warrant further study in advanced renal cancer. Combinations with newer targeted agents may show greater promise.
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Study support: National Cancer Institute (N-01-CM-17101).
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Margolin, K., Synold, T.W., Lara, P. et al. Oblimersen and α-interferon in metastatic renal cancer: a phase II study of the California Cancer Consortium. J Cancer Res Clin Oncol 133, 705–711 (2007). https://doi.org/10.1007/s00432-007-0200-6
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DOI: https://doi.org/10.1007/s00432-007-0200-6