Early research in Acta Pharmacologica Sinica (2007;28(9):1422–1428) reported that black raspberries helped inhibit tumor formation in animal models. More recent human research, presented at the American Association for Cancer Research’s sixth annual conference, explored whether black raspberries might influence cancer-related biomarkers in people at elevated risk for esophageal cancer.
The study followed 20 adults diagnosed with Barrett’s esophagus—a condition associated with a 30–40% higher likelihood of developing esophageal cancer. Participants consumed freeze-dried black raspberries daily: 45 grams for men and 32 grams for women.
Two key biomarker changes were observed:
Isoprostanes (oxidative stress markers)
Isoprostanes reflect oxidative stress and potential DNA damage, and elevated levels have been linked with Barrett’s esophagus. After raspberry supplementation, 58% of participants showed a reduction in isoprostane levels.
GST-pi (a detoxification enzyme)
Glutathione S-transferase pi (GST-pi) is involved in detoxifying carcinogens. Thirty-seven percent of participants experienced an increase in GST-pi activity after consuming black raspberries.
Together, these findings suggest that black raspberries may beneficially influence oxidative-stress and detoxification pathways in individuals with Barrett’s esophagus. Larger human trials are needed to clarify whether these biomarker shifts translate into long-term cancer-risk changes.
