Efter 6 måneders behandling med celecoxib 400 mg 2 gange dagligt var den gennemsnitlige reduktion i antallet af colorektale polypper på 28% (standardafvigelse + 24%), hvilket var signifikant bedre end for placebo (middelværdi 5%, standardafvigelse + 16%).
The mean reduction in the number of colorectal polyps following six months of treatment was 28% (SD + 24%) for celecoxib 400 mg BID which was statistically superior to placebo (mean 5%, SD +16%).