title: Phenolphthalein-containing laxative use in relation to adenomatous colorectal polyps in three studies.
abstract: Phenolphthalein, the active ingredient in many laxatives, was recently found to be a carcinogen in animal models. Human data suggest a laxative-colon cancer association, but few data specifically address the effects of phenolthalein-containing laxatives. We examined use of phenolphtalein-containing laxatives in relation to occurrence of adenomatous colorectal polyps in data from three case-control studies. The study conducted in Los Angeles, California (1991-1993), and the two studies conducted in North Carolina (1988-1990 and 1992-1995) altogether included 866 cases and 1,066 controls. The prevalence of using phenolphthalein-containing laxatives at least once a week in the recent past, however, was less than 5% among these subjects. The multivariate-adjusted odds ratios associated with recent use of phenolphthalein-containing laxatives once a week or more were 1.8 -95% confidence interval (CI), 0.5-6.2] in Los Angeles, 1.0 (CI, 0.4-2.2) in North Carolina (1988-1990), and 1.1 (CI, 0.2-5.7) in North Carolina (1992-1995). For use of other types of laxatives, the corresponding odds ratios were 1.3 (CI, 0.9-1.9) in Los Angeles, 1.0 (CI, 0.5-1.7) in North Carolina (1988-1990), and 0.9 (CI, 0.4-1.8) in North Carolina (1992-1995). Although the low prevalence of frequent use made for relatively wide confidence intervals, overall these data suggest that use of phenolphthalein-containing laxatives does not increase risk of adenomatous colorectal polyps.
authors.affiliation: Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709 USA.
authors.forename: M P
authors.initials: MP
authors.lastname: Longnecker
authors.forename: D P
authors.initials: DP
authors.lastname: Sandler
authors.forename: R W
authors.initials: RW
authors.lastname: Haile
authors.forename: R S
authors.initials: RS
authors.lastname: Sandler
mesh_terms: D018256:Adenomatous Polyps / Q000139:chemically induced / Q000209:etiology*; D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D002400:Cathartics / Q000009:adverse effects*; D015179:Colorectal Neoplasms / Q000139:chemically induced / Q000209:etiology*; D005260:Female; D006801:Humans; D007417:Intestinal Polyps / Q000139:chemically induced / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D020113:Phenolphthalein; D010635:Phenolphthaleins / Q000009:adverse effects*; D015995:Prevalence; D012307:Risk Factors
chemical_list: D002400:Cathartics; D010635:Phenolphthaleins; D020113:Phenolphthalein