Phase II A Trial of Curcumin Among Patients With Prevalent Subclinical Neoplastic Lesions (Aberrant Crypt Foci)
Basic Trial Information
Chemoprevention is the use of certain substances to keep cancer from forming, growing, or coming back. Curcumin is a compound found in plants that may prevent colon cancer from forming. This phase II trial is studying how well curcumin works in preventing colon cancer in smokers with aberrant crypt foci.
Further Study Information
I. To determine mean percentage change from baseline in prostaglandin E2 (PGE2) within ACF pre and post 30 days of curcumin administration at a specified dose.
I. To determine mean percentage change from baseline in 5-hydroxy-eicosatetraenoic acid (5-HETE) within ACF pre and post 30 days of curcumin administration at a specified dose.
II. To determine mean percentage change from baseline in PGE2 and 5-HETE within comparison normal mucosa pre and post 30 days of curcumin administration at a specified dose.
III. To quantify corresponding enzyme changes in the cyclooxygenases (COX-1, COX-2,) and lipoxygenase (5-LOX) protein abundance. Semi-quantitative changes in these proteins will be measured by western blotting and correlated with changes in prostaglandins and leukotrienes respectively.
IV. Document changes in total ACF number. V. Determine proliferation by Ki-67 IHC in rectal mucosa pre and post therapy and correlate with changes in ACF number and size.
VI. Determine curcumin concentration in rectal mucosa after 30 days therapy and correlate with PGE2 and 5-HETE changes described above.
VII. Measure glutathione peroxidase (GPx) activity within the colon pre and post therapy as an indirect marker of reduced oxidative stress within the colonic epithelium.
VIII. Ensure safety of all participants during course of study investigation. IX. Determine the curcumin concentration in plasma before and after treatment.
OUTLINE: This is a multicenter, nonrandomized, uncontrolled study.
Patients receive 1 of 2 doses of oral curcumin once daily. Treatment continues for 30 days in the absence of unacceptable toxicity or disease progression.
Blood and tissue biopsies are obtained by sigmoidoscopy or colonoscopy at baseline and at day 30 for correlative biomarker studies. The change in prostaglandin E_2 (PGE_2) is assessed by enzyme immunoassay, 5-hydroxy-eicosatetraenoic acid (5-HETE) by high-performance liquid chromatography, cyclooxygenases (COX-1 and COX-2) and 5-lipoxygenase (5-LOX) by western blotting, Ki-67 by immunohistochemistry, and glutathione peroxidase (GPx) by spectrophotometric assay.
After completion of study therapy, patients are followed at 1 week.
PROJECTED ACCRUAL: A total of 48 patients will be accrued for this study.
Trial Contact Information
Trial Lead Organizations/Sponsors
National Cancer Institute
Frank Meyskens, Principal Investigator
Link to the current ClinicalTrials.gov record.
Note: Information about this trial is from the ClinicalTrials.gov database. The versions designated for health professionals and patients contain the same text. Minor changes may be made to the ClinicalTrials.gov record to standardize the names of study sponsors, sites, and contacts. Cancer.gov only lists sites that are recruiting patients for active trials, whereas ClinicalTrials.gov lists all sites for all trials. Questions and comments regarding the presented information should be directed to ClinicalTrials.gov.