Green Tea Extract to Prevent Colorectal Adenomas, Results of a Randomized, Placebo-Controlled Clinical Trial.

INTRODUCTION: Preclinical, epidemiological, and small clinical studies suggest that green tea extract (GTE) and its major active component epigallocatechingallate (EGCG) exhibit antineoplastic effects in the colorectum. METHODS: A randomized, double-blind trial of GTE standardized to 150 mg of EGCG b.i.d. vs placebo over 3 years was conducted to prevent colorectal adenomas (n = 1,001 with colon adenomas enrolled, 40 German centers). Randomization (1:1, n = 879) was performed after a 4-week run-in with GTE for safety assessment. The primary end point was the presence of adenoma/colorectal cancer at the follow-up colonoscopy 3 years after randomization. RESULTS: The safety profile of GTE was favorable with no major differences in adverse events between the 2 well-balanced groups. Adenoma rate in the modified intention-to-treat set (all randomized participants [intention-to-treat population] and a follow-up colonoscopy 26-44 months after randomization; n = 632) was 55.7% in the placebo and 51.1% in the GTE groups. This 4.6% difference was not statistically significant (adjusted relative risk 0.905; P = 0.1613). The respective figures for the per-protocol population were 54.3% (151/278) in the placebo group and 48.3% (129/267) in the GTE group, indicating a slightly lower adenoma rate in the GTE group, which was not significant (adjusted relative risk 0.883; P = 0.1169). DISCUSSION: GTE was well tolerated, but there was no statistically significant difference in the adenoma rate between the GTE and the placebo groups in the whole study population.

Prospective, double-blind, placebo-controlled, multicenter, randomized phase III study with orally administered budesonide for prevention of irinotecan (CPT-11)-induced diarrhea in patients with advanced colorectal cancer.

BACKGROUND: Unpredictable and severe diarrhea (NCI grade > or =3) remains a life-threatening adverse event in patients treated with irinotecan (CPT-11). The aim of this study was to evaluate the efficacy and safety of orally administered budesonide for prevention of CPT-11-induced delayed diarrhea in patients with advanced colorectal cancer. PATIENTS AND METHODS: A total of 56 patients with advanced colorectal cancer receiving CPT-11 therapy (125 mg/m2 once weekly) were enrolled in this multicenter trial. Patients were randomly treated with 3 mg budesonide orally 3 times daily versus placebo. Detailed assessment of diarrhea by monitoring stool frequency, stool consistency and loperamide rescue medication was made by keeping a diary. RESULTS: Diarrhea, defined as number of stools >4 occurring on a single day during the study period, could be prevented in 58.3% of the budesonide-treated patients compared to 38.5% of the patients under placebo. Patients in the budesonide group had less episodes (0.7 vs. 2.2 episodes) and a considerably shorter total duration of diarrhea (1.8 vs. 4.2 days) episodes than patients in the placebo group. Loperamide use was more frequent in the placebo than in the budesonide arm (55.6 vs. 41.7%). Also, exposure to rescue medication of loperamide was higher for placebo (36.2 capsules) than for budesonide (24.9 capsules). A superior prevention of diarrhea was observed for budesonide compared to placebo in the first cycle (14 vs. 10; p = 0.257), with more failures observed in the placebo group (16 vs. 10). CONCLUSION: This double-blind randomized trial failed to show that budesonide has a significant benefit in preventing CPT-11-induced diarrhea. While a trend exists, further trials are warranted.