Phase Ib Randomized, Double-Blinded, Placebo-Controlled, Dose Escalation Study of Polyphenon E in Patients with Barrett's Esophagus.

Joe AK, Schnoll-Sussman F, Bresalier RS, Abrams JA, Hibshoosh H, Cheung K, Friedman RA, Yang CS, Milne GL, Liu DD, Lee JJ, Abdul K, Bigg M, Foreman J, Su T, Wang X, Ahmed A, Neugut AI, Akpa E, Lippman SM, Perloff M, Brown PH, Lightdale CJ
Cancer Prev Res (Phila). 2015 8 (12): 1131-7

PMID: 26471236 · PMCID: PMC4670789 · DOI:10.1158/1940-6207.CAPR-14-0274-T

This study was conducted to determine the safety and efficacy of the green tea-derived Polyphenon E (Poly E) in patients with Barrett's Esophagus (BE). Subjects were randomized to a 6-month, twice daily (BID) oral treatment of placebo or Poly E (200, 400, or 600 mg). Endoscopic evaluation, including biopsies, was performed before and after treatment. The primary objective was to demonstrate safety; secondary objectives investigated catechin accumulation and effects in clinical specimens. Of the 44 enrolled subjects, 11 received placebo, and 33 received Poly E. No dose-limiting toxicities were encountered, and a maximum tolerated dose (MTD) was not reached. The recommended phase II dose was 600 mg twice daily. The most common treatment-related adverse events (AE) in Poly E-treated subjects were grade I and II nausea, grade I belching, and grade I lactate dehydrogenase (LDH) elevation. No treatment-related AEs were reported in placebo-treated subjects, aside from grade I laboratory abnormalities. Pill counts and subject diaries were not consistently collected, and compliance was difficult to determine. However, on the basis of an intention-to-treat analysis, there was a significant relationship between Poly E dose and esophageal EGCG level--mean changes (pmol/g) of 0.79 (placebo), 6.06 (200 mg), 35.67 (400 mg), and 34.95 (600 mg); P = 0.005. There was a possible relationship between Poly E dose and urine PGE-M concentration. In conclusion, Poly E was well-tolerated, and treatment with Poly E (400 and 600 mg) but not Poly E (200 mg) or placebo resulted in clinically relevant and detectable EGCG accumulation in the target organ, esophageal mucosa.

©2015 American Association for Cancer Research.

MeSH Terms (14)

Aged Aged, 80 and over Barrett Esophagus Biopsy Catechin Chromatography, High Pressure Liquid Dose-Response Relationship, Drug Double-Blind Method Esophagoscopy Female Humans Male Middle Aged Phytotherapy

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