Purpose: NC-6004, a novel cisplatin nanoparticle developed using micellar technology exhibits sustained release of cisplatin and selective distribution to tumors. Preclinical data demonstrated a favorable tolerability profile and preserved or improved antitumor activity compared with cisplatin across animal models. We evaluated the safety and tolerability of NC-6004 and gemcitabine using a Bayesian continual reassessment model (N-CRM) to determine the optimal dose.Experimental Design: Patients with advanced solid tumors received NC-6004 at 60 to 180 mg/m 2 on day 1 and gemcitabine at 1,250 mg/m 2 on days 1 and 8 every 3 weeks. Dose escalation of NC-6004 began with a single patient run-in until a dose-limiting toxicity occurred at 180 mg/m 2 . Cohorts of four patients were enrolled at doses predicted by the N-CRM. The maximum tolerated dose (MTD) was defined as having the greatest probability of target toxicity <25%. Quality of life was assessed using EORTC-QLQ-C30.Results: Among 22 patients, the most common grade III/IV hematologic adverse events were leukopenia (68%) and thrombocytopenia (59%). Of 20 pretreated patients evaluable for response, half were previously exposed to a platinum agent. The MTD was 135 mg/m 2 . Nine patients were treated at the MTD with median treatment duration of 15 weeks (range, 3-50). Tumor shrinkage occurred in 11 (55%), partial responses in 3 (15%), and stable disease in 14 (70%). Most patients reported stable or improved EORTC QLQ-C30 scores.Conclusions: Greater cisplatin equivalent doses were achieved with no clinically significant neuro-, oto-, or nephrotoxicity. These data demonstrate tolerability and promising activity of NC-6004 in combination with gemcitabine.
ObjectivesThis study was an open-label phase I study to confirm the safety and tolerability of NC-6004 in combination with gemcitabine in Japanese patients with advanced solid tumors and to assess the PK effects of NC-6004 monotherapy.MethodsThis phase I study used a 3 + 3 design to determine the maximum tolerated dose (MTD) and recommended dose of NC-6004 combined with gemcitabine. Safety and pharmacokinetics were assessed. The administration of NC-6004 alone was started at 60 mg/m2 every treatment cycle (21 days per cycle). From the second through eighth cycles, patients received NC-6004 in combination with 1000 mg/m2 of gemcitabine that was administered on day 1 and day 8 of each cycle, except for the first treatment cycle.ResultsTwelve patients with advanced solid tumors received 60 or 90 mg/m2 NC-6004. Both MTD and RD were determined to be 90 mg/m2. The most common drug-related adverse events were neutrophil decrease (66.7%) and white blood cell count decrease (41.7%). Population pharmacokinetic (PK) analysis revealed that NC-6004 PK profile in Japanese study was not significantly different from that in a previous Caucasian study.ConclusionsBoth MTD and RD of NC-6004 were determined to be 90 mg/m2. The pharmacodynamic (PD) model well explained the time course of estimated glomerular filtration rate (eGFR) and amplitude of decrease in eGFR. The decrease in eGFR appeared to reach saturation at >100 mg/m2 with NC-6004. Estimated probability of acute kidney injury on this PK/PD simulation was 30% with NC-6004 and 70% with cisplatin, which may better explain the renal toxicity profile.
Abstract-The effect of synthetic w-conotoxin (w-CgTX) on the contractile re sponses of segments of rat ileum, stomach fundus and uterus and guinea pig taenia coli were investigated. w-CgTX (10-9-5 X 10-6 M) did not inhibit the contractile responses of al! smooth muscle segments to high KCI and/or ACh. However, unexpectedly, w-CgTX (3x10-7-10-5 M) alone caused dose-dependent con traction of segments of the stomach fundus and uterus. These contractile responses to w-CgTX alone depended upon the presence and/or the influx of extracellular Cat+; and they were inhibited by calcium antagonists such as diltiazem, nitrendipine and verapamil, with the exception that the segments of stomach fundus was not inhibited by verapamil. With the segments of uterus, but not those of other tissues, w-CgTX (10-7-5X10-6 M) significantly enhanced the contractile responses to various concentrations of ACh and high KCI. With rat ileum and guinea pig taenia coli segments, w-CgTX (10-9-5x10-6 M) did not induce a contractile response or have an enhancing effect. These findings suggest that w-CgTX may have a calcium agonist-like effect on smooth muscles such as the stomach fundus and uterus of rats.
We examined the effect of ethyl all-cis-5,8,11,14,17-icosapentaenoate (EPA-E) with high purity on circulating lipids in rats under several experimental conditions. In normolipidemic rats, EPA E decreased the lipids in a dose-dependent manner. Clofibrate (100 mg/kg/day) was more potent in lowering the lipids than EPA-E (1000 mg/kg/day). In high cholesterol diet-fed rats, EPA-E (300 mg/kg/day) decreased the total cholesterol. However, clofibrate (300 mg/kg/day) had little effect on the total cholesterol. In hypertriglycemic rats induced by corn oil, EPA-E (300 mg/kg/day) or clofi brate (100 mg/kg/day) reduced the rise of triglycerides. EPA-E (300 mg/kg/day), clinofibrate (100 mg/kg/day) or clofibrate (300 mg/kg/day) caused a significant reduction in the lipids induced by the in jection of Triton WR-1339. Furthermore, EPA-E (300 mg/kg/day) or clinofibrate (100 mg/kg/day) de creased the elevation of lipids produced by feeding the rats a casein-rich diet. These results show that EPA-E possesses potent inhibitory activity on experimental hyperlipidemia induced either exogenously or endogenously.
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