Test article concentrations were prepared fresh daily by diluting stock solutions into extracellular solutions (HB-PS buffer).
Therefore, NCDFA is required in all regulated studies to verify the documented test article concentrations in formulations used to calculate these safety margins (1, 2).
Therefore, nonclinical dose formulation analysis (NCDFA) is required in all nonclinical regulated studies to verify the documented test article concentrations in formulations used to determine these safety margins (1– 3).
Contain complete substance information [e.g., (eco- toxicological eco- toxicologicalng in theffectsle, concentration range].
Nonclinical dose formulation analysis methods are used to confirm test article concentration and homogeneity in formulations and determine formulation stability in support of regulated nonclinical studies.
Dose-dependent increases in mutant phenotype RETs and RBCs (i.e., RETCD24− and RBCCD24−) were observed in both cell populations (for RETCD24− Poisson regression chi-square for test article concentration effect = 129.10, p < 0.0001, and for RBCCD24− Poisson regression chi-square for test article concentration effect =83.82, p < 0.0001).
A dose-dependent increase in % MN-RETs and % MN-NCE was observed (for RETs, Poisson regression chi-square for test article concentration effect = 46.77, p < 0.0001, and for NCEs, Poisson regression chi-square for test article concentration effect = 112.53, p < 0.0001).
The offset (i.e., natural log of pfu) was given a constant coefficient of 1.0 for each observation, and log-linear relationships between mutant count and test article concentration were specified by a natural log link function.
Results for each test article concentration (n=3 4) were averaged, mean and standard deviation values were calculated and used to generate dose response curves in XLfit add-in for Excel 2003 (Microsoft, Redmond, WA).
The offset (i.e., natural log) was given a constant coefficient of 1.0 for each observation, and log-linear relationships between mutant count and test article concentration were specified by a natural log link function.
A dose-dependent increase in BaP-induced lacZ MF was observed in all four tissues (Poisson regression chi-square for test article concentration effect = 149.56 for bone marrow, 237.95 for liver, 156.95 for small intestine and 179.09 for glandular stomach, p < 0.0001 for all tissues).
