Abstract
Objectives: Describe the population characteristics of liver chemistries, the incidence and patterns of liver chemistry abnormalities, and the longitudinal behavior of alanine aminotransferase in mild-to-moderate asthmatic patients. Methods: We undertook a retrospective analysis of comparator arm data from a long-term safety surveillance study of a leukotriene inhibitor. Results: Several liver chemistry elevations relative to the upper limit of normal were observed. We identified three other types of outliers: liver chemistry elevations relative to screening values, persistent liver chemistry elevations, and unusually variable alanine aminotranferase. Conclusions: In the absence of any common drug therapy, there are considerable within-population differences of liver chemistry profiles including substantial outliers. This ordinary variability should be taken into account in the design of clinical trials and analysis of drug-induced liver injury therein.
Keywords: Alanine aminotransferase, aspartate aminotransferase, bilirubin, alkaline phosphatase, gamma-glutaminyl transferase, observational study
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