A total of 18 children 10 to 14 years of age who had genotype or phenotype positive FAP were treated with celecoxib 4 mg/ kg/ day (4 patients, compared to 2 patients treated with placebo), celecoxib 8 mg/ kg/ day (4 patients, compared to 2 patients treated with placebo), or celecoxib 16 mg/ kg/ day (4 patients, compared to 2 patients treated with placebo).