A Phase II Trial with Pharmacodynamic Endpoints of the Proteasome Inhibitor Bortezomib in Patients with Metastatic Colorectal Cancer
| Autor: | Lillian L. Siu, Trudey Nicklee, Carol A. Townsley, Ming-Sound Tsao, Mary J. MacKenzie, Diana C. Birle, Mark Vincent, David W. Hedley, Helen Mackay, Pierre Major, Pam Degendorfer, Malcolm A.S. Moore, John W. Wright, Amit M. Oza |
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| Rok vydání: | 2005 |
| Předmět: |
Male
Oncology Cancer Research Pathology Time Factors Colorectal cancer Biopsy Metastasis Bortezomib Serine Enzyme Inhibitors Neoplasm Metastasis Phosphorylation Infusions Intravenous Carbonic Anhydrases Aged 80 and over medicine.diagnostic_test NF-kappa B Middle Aged Boronic Acids Immunohistochemistry Treatment Outcome Liver Pyrazines Disease Progression Female Colorectal Neoplasms Proteasome Inhibitors medicine.drug medicine.medical_specialty Antineoplastic Agents Antigens Neoplasm Internal medicine medicine Humans Carbonic Anhydrase IX Aged Tumor hypoxia business.industry Microcirculation medicine.disease Regimen Proteasome inhibitor Tumor Suppressor Protein p53 business Neoplasm Transplantation Progressive disease |
| Zdroj: | Clinical Cancer Research. 11:5526-5533 |
| ISSN: | 1557-3265 1078-0432 |
| DOI: | 10.1158/1078-0432.ccr-05-0081 |
| Popis: | Purpose: To evaluate the effects of the proteasome inhibitor bortezomib on tumor growth in patients with advanced colorectal cancer, and to explore the relationship between correlative studies and clinical outcome. Design: Bortezomib (1.3 mg/m2) was administered i.v. on days 1, 4, 8, and 11 of a 21-day cycle. Tumor response was assessed after every two cycles. Tumor biopsies were done prior to treatment and on day 9 of the first treatment cycle. Biopsies were examined for Ser32/36-IκB, Ser276-nuclear factor κB (NFκB), hypoxia-inducible factor-1α (HIF-1α), carbonic anhydrase IX (CAIX), p53, and microvessel density using immunohistochemistry. Results: Nineteen patients received 42 cycles (range 1-4) of bortezomib. No objective response was seen; three patients had stable disease at cycle 2, two patients had progressive disease after cycle 1, and 11 patients had progressive disease at cycle 2. Of the three patients with stable disease, one had progressive disease after cycle 4, and two were withdrawn due to toxicity. The median time to progression was 5.1 weeks (95% confidence interval, 5.1-11.1 weeks). There was a significant increase in the expression of HIF-1α relative to its transcriptional target CAIX following bortezomib, and a similar effect was also observed in a companion study using a human tumor xenograft model. Expression of p53, Ser276-NFκB, and Ser32/36-IκB was unchanged. Conclusion: Single agent bortezomib is inactive in metastatic colorectal cancer. Using this regimen, there was no detectable effect on NFκB, but a significant accumulation of HIF-1α was seen relative to CAIX. This suggests that proteasome inhibition alters the response to tumor hypoxia, and further investigation of this effect is indicated. |
| Databáze: | OpenAIRE |
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