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94 protocols using phoenix winnonlin 6

1

Plasma Pharmacokinetics of CS and DCF

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The plasma concentration-time curve was constructed for each calf using the software program (Phoenix WinNonLin 6.3, Pharsight, St. Louis, MO, U.S.A.). Individual plasma concentration-time curves and Akaike Information Criteria
(AIC) were examined for evaluation of the pharmacokinetics of CS and DCF, as previously described [52 (link)]. The pharmacokinetic variables were analyzed based on a two-compartment model. The peak
plasma concentration (Cmax), and time elapsed to reach peak plasma concentration (Tmax) were determined based on the plasma concentration-time curve for each calf. Other parameters were calculated using the
pharmacokinetic software program (Phoenix WinNonLin 6.3, Pharsight).
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2

Noncompartmental Pharmacokinetic Analysis

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A standard noncompartmental analysis was performed for each individual cefoxitin plasma concentration-time profile using Phoenix WinNonlin 6.1 software (Pharsight, Mountain View, CA). Terminal half-life, area under the concentration-time curve from time zero to infinity (AUC, calculated by linear trapezoidal method), volume of distribution at steady state (Vss), and systemic clearance (CL) were calculated. Individual plasma concentration-time profiles were evaluated using one compartment model. Plasma concentration at the time of wound closure was determined from the fitted profiles, and the ratio of tissue to plasma concentration was calculated for all patients.
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3

Pharmacokinetic Analysis of Preclinical Data

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Concentration versus time data from mice, rats, and cynomolgus monkeys were calculated by non-compartmental analysis using Phoenix WinNonlin 6.1 (Pharsight Corporation, Mountain View, CA, USA). Clearances, volumes of distribution, maximum concentration (Cmax), and area under the plasma concentration-time curves from zero to the last measurable point (AUClast) were determined. The elimination rate constant (ke) was estimated from the slope of the best-fit line determined by linear regression analysis of a log-transformed concentration-time curve. The elimination half-life (t1/2) was then calculated by the equation t1/2= ln(2)/ke. Clearance was calculated as the dose divided by the AUC from time zero to infinity (AUCinf).
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4

Pharmacokinetics of Nebivolol and Metabolite

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Non-compartmental pharmacokinetic (PK) analysis was employed to determine the pharmacokinetic parameters of nebivolol and its hydroxylated active metabolite (4-OH-nebivolol). The analytical method for nebivolol determination was not enantioselective. The maximum plasma concentration (Cmax, ng/ml) and the time to reach the peak concentration (tmax, h) were obtained directly by visual inspection of each subject’s plasma concentration-time profile. The area under the concentration-time curve (AUC0-t) was estimated by integration using the trapezoidal rule from time zero to the last measurable concentration at time t. The area was extrapolated to infinity (AUC0-∞) by addition of Ct/kel to AUC0-t where Ct is the last quantifiable drug concentration and kel is the elimination rate constant. The pharmacokinetic analysis was carried out using Phoenix WinNonlin 6.1 (Pharsight, USA).
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5

Phase I Study of CKD-516 Pharmacokinetics

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Safety and tolerability were measured by adverse events (AEs), vital sign, body weight, electrocardiogram (ECG), and laboratory tests. Safety was assessed according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) ver. 4.02. PK parameters of CKD-516 and S-516 were calculated using the noncompartmental method with Phoenix WinNonlin 6.1 (Pharsight, Mountain View, CA). The pharmacokinetic linearity was assessed by linear regressions between dose and Cmax or AUClast and between log-transformed dose and log-transformed Cmax or log-transformed AUClast. Efficacy was measured using Response Evaluation Criteria in Solid Tumor (RECIST) ver. 1.1. Tumor responses were assessed after the first cycle or earlier in patients with suspected progression.
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6

Noncompartmental Pharmacokinetic Analysis

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The PK parameters for the probe substrates were calculated for each subject by a noncompartmental analysis using Phoenix WinNonlin 6.1 software (Pharsight, Mountain View, CA). The plasma Cmax and time to reach Cmax (tmax) were obtained directly from experimental observations. The AUC from time zero to the last measureable time point (AUC0–t) was calculated by a linear trapezoidal method using the actual elapsed time. The AUC from time zero to infinity (AUC) was calculated by the following equation: AUC = AUC0–t+Ct/kel, where Ct is the plasma concentration of the probe substrate at the last measureable time point and kel is the elimination rate constant.
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7

Pharmacokinetics of Amifampridine and Metabolite

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Plasma concentration-time data were used to calculate PK parameters for amifampridine and the 3-N-acetyl metabolite using noncompartmental analysis (Phoenix WinNonlin 6.1; Pharsight Corporation, Cary, NC). The values for Cmax and Tmax were obtained directly from plasma-time concentration data by inspection without interpolation. The values for AUC0-t were calculated by the linear trapezoidal rule. The AUC0-4h values for each multiple dosing interval in Part 2 were calculated using a 0–4 h reference time interval (not clock time) for each of the four doses on Days 1 and 3. The apparent t½ was calculated by 0.693/λz, where the terminal elimination rate constant λz was determined by log-linear regression of the terminal plasma concentrations. The AUC0-∞ was calculated by AUC0-t + Ct/λz, where Ct is the last measurable plasma concentration for measured drug or metabolite. The apparent oral clearance CL/F was calculated by dose/AUC0-∞, where F represents the unknown fraction of absorbed drug. The apparent oral volume of distribution Vdz/F was calculated based on the terminal elimination rate constant by (CL/F) · 1/λz. The apparent oral volume of distribution at steady state Vdss/F was calculated as MRT0-∞ · CL/F, where MRT0-∞ is the mean residence time extrapolated from time 0 to infinity.
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8

Pharmacokinetics of Tamoxifen and Metabolites

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Blood samples (4 mL; lithium-heparin) for the measurement of tamoxifen and its main metabolites were collected just before and at 0.5, 1, 1.5, 2, 4, 6, 8, 12 and 24 h after administration of tamoxifen. Plasma was isolated by centrifugation of the samples for 10 min at 2500g and was stored at −70° C until the analysis. The measurement of tamoxifen and its main metabolites in plasma was performed using a validated ultra-performance liquid chromatography (UPLC)–tandem mass spectrometry (MS/MS) assay, as described elsewhere [18 (link)].
Individual pharmacokinetic parameters, including the trough concentration (Ctrough) and maximum concentration (Cmax), were determined, and the area under the plasma concentration–time curve from time zero to 24 h (AUC0–24) was calculated by noncompartmental analysis using Phoenix WinNonlin 6.1 (Pharsight Corporation, Mountain View, CA, USA). The estimated parameters of patients who used 40 mg tamoxifen were corrected to 20 mg. The metabolic ratios were computed as AUC0–24metabolite/AUC0–24tamoxifen.
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9

Pharmacokinetic Analysis of Amoxicillin

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Pharmacokinetic analysis of the data was performed using non-compartmental analysis by the software data package Phoenix WinNonlin 6.1 (Pharsight Corporation, Mountain View, CA, USA). The parameters determined include λz (the slope of the terminal elimination phase of the time-concentration curve), t1/2λ (elimination or terminal half-life), Cmax (maximum plasma concentration), Tmax (time to reach Cmax), AUCINF (area under the plasma concentration–time curve from time zero to infinity), AUMCINF (area under the moment curve), MRT (mean residence time). All of these parameters were compared between the different products by one way analysis of variance (ANOVA) using statistical software SPSS 17.0 (SPSS Inc., Chicago, IL, USA). All results were presented as mean ± SD and a P-value of 0.05 was set as the threshold for differences to be considered statistically significant. The relative bioavailability (F) of AMO was calculated by the method of corresponding areas, which entails comparison of the total areas under the plasma concentration-time curves (AUC) obtained after p.o and i.m. administration: F = AUCp.o./AUCi.m..
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10

Donepezil Pharmacokinetics and Dose Linearity

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The plasma concentration–time profiles of donepezil in the subjects were analyzed by using a noncompartmental method and WinNonlin 6.1 (Pharsight Corporation, Princeton, NJ, USA). All analyses were made by using actual times of sampling. The Cmax and tmax were determined from the observed values. The terminal elimination rate constant (λz) was estimated by linear regression of the terminal log-linear portion of the plasma concentration–time curves. The area under the time–concentration curve (AUC) from time 0 to the last measurable time (AUClast) was calculated by the trapezoidal rule, and the AUC extrapolated to infinity (AUCinf) was obtained as follows:
AUCinf=AUClast+Clast/λz for which Clast is the last quantifiable concentration.
The t1/2β was calculated for each participant as follows:
t1/2β=ln(2)/λz
All statistical analyses were performed by using SAS 9.3 (SAS Korea, Seoul, Republic of Korea) and Phoenix WinNonlin 6.1 (Pharsight Corporation). Demographic data and pharmacokinetic parameters were summarized by using descriptive statistics. Dose linearity was investigated by using the Kruskal–Wallis test to evaluate the dose-normalized Cmax and AUCinf values.
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