• Pharmacokinetics [ Time Frame: Days 1, 7, 14, 21, and 28 ]
  

Ulcerative colitis is a type of inflammatory bowel disease characterized by diffuse, continuous inflammation of the colon. Recent estimates suggest that approximately 17,000 children between 5 and 17 years of age in the U.S. are diagnosed with ulcerative colitis. Estimates of average age at onset in children vary, although 80-90% of patients are 9 years of age or older when symptoms develop.

Asacol is a delayed-release tablet formulation designed to deliver mesalamine (also known as mesalazine) at a pH ≥ 7.0. This property results in release of the drug in the terminal ileum and beyond. Physiologic factors such as the pH of the surrounding medium, transit times in the intestinal regions of interest, and the rate and extent of absorption and metabolism govern Asacol drug release and delivery, which in turn influence the pharmacokinetic profile of the delivered drug. These physiologic factors and their effect on Asacol pharmacokinetics have been studied in adults, but corresponding studies in children have not been performed. However, relevant studies describing the gastrointestinal pH; transit times; and pharmacokinetic aspects of drug absorption, metabolism, and excretion in pediatric patients (relative to adults) provide reasons to expect that the performance characteristics of Asacol in the pediatric population will be similar to those measured in adults.

In a compassionate-use study that included 66 children between the ages of 3 and 16 years, the safety profile of long-term mesalamine therapy (10 to 93 mg/kg/day) was similar to that observed among adult patients enrolled in the study. In addition, in a retrospective study of 732 pediatric patients with inflammatory bowel disease (153 of whom were treated with mesalamine), D'Agata, et al. concluded that mesalamine was safe and well tolerated when used long term at doses ranging from 13 to 111 mg/kg/day. Although few clinical studies of mesalamine have been performed in children, pediatric gastroenterologists use mesalamine to treat children with inflammatory bowel disease, and doses higher than those proposed for this study (up to 100 mg/kg/day) have been recommended.

This study will provide information about the pharmacokinetics of mesalamine and its major metabolite in children being treated with Asacol for mildly to moderately active ulcerative colitis. It was designed to meet the expectations outlined in a Written Request issued by the FDA, as well as regulatory requirements to study the weight-based equivalent of 4.8 g/day. The age-appropriate dose formulation, the 400 mg tablet, will be used, and patients will be dosed every 12 hours, since this regimen is considered more convenient for pediatric patients and their parents.

During this open-label, randomized, 4-week parallel-group study in pediatric patients, patients will be stratified by age (5-8 years and 9-17 years), and randomly assigned to one of 3 dose levels (30 mg/kg/day, 60 mg/kg/day, and 90 mg/kg/day) in the manner described in Section 3.5.1. Patients weighing less than 20 kg will not be assigned to the 30 mg/kg group, and patients weighing more than 60 kg will not be assigned to the 90 mg/kg group, due to dosing concerns. A total of 48 patients will be enrolled (8/treatment group/age stratum), with the expectation that 36 (6/treatment group/age stratum) will complete.