verubulin and Neoplasms

MPC-6827 (Azixa) is a small-molecule microtubule-destabilizing agent that binds to the same (or nearby) sites on β-tubulin as colchicine. This phase I study was designed to determine the dose-limiting toxicities (DLT), maximum tolerated dose (MTD), and pharmacokinetics (PK) of MPC-6827 in patients with solid tumors. Patients with advanced/metastatic cancer were treated with once-weekly, 1- to 2-hour intravenous administration of MPC-6827 for 3 consecutive weeks every 28 days (1 cycle). Dose escalation began with 0.3, 0.6, 1, and 1.5 mg/m(2), with subsequent increments of 0.6 mg/m(2) until the MTD was determined. A 3 + 3 design was used. Pharmacokinetics of MPC-6827 and its metabolite MPI-0440627 were evaluated. Forty-eight patients received therapy; 79 cycles were completed (median, 1; range, 1-10). The most common adverse events were nausea, fatigue, flushing, and hyperglycemia. The DLT was nonfatal grade 3 myocardial infarction at 3.9 mg/m(2) (1/6 patients) and at 4.5 mg/m(2) (1/7 patients). The MTD was determined to be 3.3 mg/m(2) (0/13 patients had a DLT). Five (10.4%) of the 48 patients achieved stable disease (Response Evaluation Criteria in Solid Tumors) for 4 months or greater. MPC-6827 has a high volume of distribution and clearance. Half-life ranged from 3.8 to 7.5 hours. In conclusion, MPC-6827 administered intravenously over 2 hours at a dose of 3.3 mg/m(2) once weekly for 3 weeks every 28 days was safe in patients with heavily pretreated cancer. Clinical trials with MPC-6827 and chemotherapy are ongoing.

Topics: Adult; Aged; Antineoplastic Agents; Contrast Media; Demography; Drug Administration Schedule; Female; Follow-Up Studies; Humans; Magnetic Resonance Imaging; Male; Middle Aged; Neoplasm Staging; Neoplasms; Quinazolines; Tubulin Modulators

In this study, the antitumor effects of tubulin-binding agent MPC-6827 on HeLa, MCF-7 and A549 cell lines originated from cervix carcinoma, metastatic breast adenocarcinoma and adenocarcinomic human alveolar basal epithelial cells respectively were determined. Cell index, BrdU labelling index, mitotic index and apoptotic index were evaluated in experiments. In cell index experiment 2 nM, 4 nM, 6 nM, 8 nM, 10 nM MPC-6827 applied to three cell lines. These parameters showed that 4 nM was the optimum concentration for HeLa and A549 cells, while 2 nM was the optimum concentration for MCF-7 cells. The use of optimum concentrations for each cell line has shown that while there was a significant decrease in mitotic index, BrdU labelling index, there was a significant increase in apoptotic index.

Topics: Antineoplastic Agents; Apoptosis; Bromodeoxyuridine; Cell Line, Tumor; Cell Proliferation; Female; HeLa Cells; Humans; Neoplasms; Quinazolines; Tubulin

Vascular-disrupting agents (VDAs) represent a new class of chemotherapeutic agent that targets the existing vasculature in solid tumors. Preclinical and early-phase trials have demonstrated the promising therapeutic benefits of VDAs but have also uncovered a distinctive toxicity profile highlighted by cardiovascular events.. We reviewed all preclinical and prospective phase I-III clinical trials published up to August 2010 in MEDLINE and the American Association of Cancer Research and American Society of Clinical Oncology meeting abstracts of small-molecule VDAs, including combretastatin A4 phosphate (CA4P), combretastatin A1 phosphate (CA1P), MPC-6827, ZD6126, AVE8062, and ASA404.. Phase I and II studies of CA1P, ASA404, MPC-6827, and CA4P all reported cardiovascular toxicities, with the most common cardiac events being National Cancer Institute Common Toxicity Criteria (version 3) grade 1-3 hypertension, tachyarrhythmias and bradyarrhythmias, atrial fibrillation, and myocardial infarction. Cardiac events were dose-limiting toxicities in phase I trials with VDA monotherapy and combination therapy.. Early-phase trials of VDAs have revealed a cardiovascular toxicity profile similar to that of their vascular-targeting counterparts, the angiogenesis inhibitors. As these agents are added to the mainstream chemotherapeutic arsenal, careful identification of baseline cardiovascular risk factors would seem to be a prudent strategy. Close collaboration with cardiology colleagues for early indicators of serious cardiac adverse events will likely minimize toxicity while optimizing the therapeutic potential of VDAs and ultimately enhancing patient outcomes.

Topics: Angiogenesis Inhibitors; Bibenzyls; Cardiovascular System; Clinical Trials as Topic; Humans; Neoplasms; Neovascularization, Pathologic; Organophosphorus Compounds; Quinazolines; Serine; Xanthones