Investigational new drugs
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Investigational new drugs · Dec 2010
Antitumor activity of natural compounds, curcumin and PKF118-310, as Wnt/β-catenin antagonists against human osteosarcoma cells.
Aberrant activation of the Wnt/β-catenin signaling pathway promotes osteosarcoma tumorigenesis and metastasis. In this study, we tested the hypothesis that osteosarcoma progression may be delayed by disrupting the Wnt/β-catenin pathway using small molecule inhibitors such as curcumin and PKF118-310. Effective inhibitions of the Wnt/β-catenin pathway by curcumin and PKF118-310 in osteosarcoma cells were shown by the suppression of both intrinsic and activated β-catenin/Tcf transcriptional activities using luciferase reporter assays. ⋯ Using cell apoptosis assay and cell cycle analysis, we further showed that the anti-proliferative effect of PKF118-310 is attributed to PKF118-310-induced apoptosis and G2/M phase arrest. Lastly, we observed that these anti-cancer effects correlated with the decreased expression of cyclin D1, c-Myc and survivin. Our findings strongly suggest that curcumin and PKF118-310 have great therapeutic potential for the treatment of osteosarcoma.
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Investigational new drugs · Oct 2010
Development of a new fully human anti-CD20 monoclonal antibody for the treatment of B-cell malignancies.
Despite the widespread use of rituximab, a chimeric monoclonal antibody with demonstrated efficacy in the treatment of non-Hodgkin's lymphomas, there is a recognized need to develop new agents with improved efficacy. Towards this end, using XenoMouse technology, a fully human IgG1 anti-CD20 monoclonal antibody was generated. This antibody, denoted mAb 1.5.3, evoked enhanced pro-apoptotic activity in vitro, as compared to rituximab, in the Ramos lymphoma cell line. ⋯ Furthermore, mAb 1.5.3 exhibited enhanced anti-tumor activity in Ramos, Daudi, and Namalwa tumour xenograft models. Lastly, mAb 1.5.3 produced a superior B-cell depletion profile in lymph node organs and bone marrow as compared to rituximab in a primate pharmacodynamic (PD) model. These findings underscore the potential of mAb 1.5.3 to exhibit improved clinical activity in the treatment of B-cell malignancies compared to rituximab.
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Investigational new drugs · Jun 2010
Development and characterization of CD22-targeted pegylated-liposomal doxorubicin (IL-PLD).
Non-Hodgkin's lymphoma (NHL) is the sixth most common cause of cancer deaths in the U. S. Most NHLs initially respond well to chemotherapy, but relapse is common and treatment is often limited due to the toxicity of chemotherapeutic agents. ⋯ IL-PLD exhibits more cytotoxicity than PLD in CD22 positive cell lines but does not increase killing of CD22 negative cells. The IC(50) of IL-PLD is 3.1 to 5.4 times lower than that of PLD in CD22+ cell lines while the IC(50) of IL-PLD is equal to that of PLD in CD22- cells. Furthermore, IL-PLD remained bound to the CD22+ cells after washing and continued to exert cytotoxic effects, while PLD and NL- doxorubicin could easily be washed from these cells.
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Investigational new drugs · Feb 2010
Two-stage model-based clinical trial design to optimize phase I development of novel anticancer agents.
The phase I program of anticancer agents usually consists of multiple dose escalation studies to select a safe dose for various administration schedules. We hypothesized that pharmacokinetic and pharmacodynamic (PK-PD) modeling of an initial phase I study (stage 1) can be used for selection of an optimal starting dose for subsequent studies (stage 2) and that a post-hoc PK-PD analysis enhances the selection of a recommended dose for phase II evaluation. The aim of this analysis was to demonstrate that this two-stage model-based design, which does not interfere in the conduct of trials, is safe, efficient and effective. ⋯ A two-stage model-based phase I design is safe for anticancer agents with dose-limiting myelosuppression and may enhance the efficiency of dose escalation studies by reducing the number of patients treated with a dose below the recommended dose and by increasing the precision of dose selection for phase II evaluation.
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Investigational new drugs · Dec 2009
Comparative Study"Classical 3 + 3 design" versus "accelerated titration designs": analysis of 270 phase 1 trials investigating anti-cancer agents.
The number of patients treated at each dose-level in dose seeking phase I trials is arbitrarily established. The most frequently used design is the "classical 3 + 3 design (3 + 3D)". Recently, Simon et al. had introduced several "accelerated titration designs (ATD)". ⋯ ATD had permitted to explore significantly more dose levels (seven versus five, p = 0.0001) and reduced the rate of patients treated at doses below phase-2 recommended dose (46% versus 56%, p = 0.0001). Nevertheless, ATD did not allow a reduction in the number of enrolled patients, shorten the accrual time nor increase the efficacy of phase I trials. These data support that ATD as an effective clinical trial design over a standard 3 + 3 dose escalation design.