Faculty Collaboration Database

Topical application of a mucoadhesive freeze-dried black raspberry gel induces clinical and histologic regression and reduces loss of heterozygosity events in premalignant oral intraepithelial lesions: results from a multicentered, placebo-controlled clinical trial. Clin Cancer Res 2014 Apr 01;20(7):1910-24

Date

02/04/2014

Pubmed ID

24486592

Pubmed Central ID

PMC3975696

DOI

10.1158/1078-0432.CCR-13-3159

Scopus ID

2-s2.0-84898727207 (requires institutional sign-in at Scopus site)   68 Citations

Abstract

PURPOSE: Approximately 30% higher grade premalignant oral intraepithelial neoplasia (OIN) lesions will progress to oral cancer. Although surgery is the OIN treatment mainstay, many OIN lesions recur, which is highly problematic for both surgeons and patients. This clinical trial assessed the chemopreventive efficacy of a natural product-based bioadhesive gel on OIN lesions.

EXPERIMENTAL DESIGN: This placebo-controlled multicenter study investigated the effects of topical application of bioadhesive gels that contained either 10% w/w freeze-dried black raspberries (BRB) or an identical formulation devoid of BRB placebo to biopsy-confirmed OIN lesions (0.5 g × q.i.d., 12 weeks). Baseline evaluative parameters (size, histologic grade, LOH events) were comparable in the randomly assigned BRB (n = 22) and placebo (n = 18) gel cohorts. Evaluative parameters were: histologic grade, clinical size, and LOH.

RESULTS: Topical application of the BRB gel to OIN lesions resulted in statistically significant reductions in lesional sizes, histologic grades, and LOH events. In contrast, placebo gel lesions demonstrated a significant increase in lesional size and no significant effects on histologic grade or LOH events. Collectively, these data strongly support BRB's chemopreventive impact. A cohort of very BRB-responsive patients, as demonstrated by high therapeutic efficacy, was identified. Corresponding protein profiling studies, which demonstrated higher pretreatment levels of BRB metabolic and keratinocyte differentiation enzymes in BRB-responsive lesions, reinforce the importance of local metabolism and differentiation competency.

CONCLUSIONS: Results from this trial substantiate the LOH reductions identified in the pilot BRB gel study and extend therapeutic effects to significant improvements in histologic grade and lesional size.

Author List

Mallery SR, Tong M, Shumway BS, Curran AE, Larsen PE, Ness GM, Kennedy KS, Blakey GH, Kushner GM, Vickers AM, Han B, Pei P, Stoner GD

MESH terms used to index this publication - Major topics in bold

Administration, Topical
Adult
Aged
Female
Fruit
Gels
Humans
Male
Middle Aged
Mouth Neoplasms
Phytotherapy