Below article from Fresh Plaza Newsletter might be of interest to some of you.
Black raspberries are rare in supermarkets, aren't they?

Melly

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US: Black raspberries inhibit cancer

Flavonoids in black raspberries not only inhibit the growth of cancer, but they
also cause cancer cells to commit suicide. Researchers at the Ohio State
Comprehensive Cancer Center found that a class of flavonoids found in black
raspberries called anthocyanins, slow the growth of cancer and caused cancer
cells to commit suicide in rats with esophageal cancer.

“Our data provide strong evidence that anthocyanins are important for cancer
prevention,” said Gary D. Stoner, Ph.D., a professor in the department of
internal medicine at Ohio State University.

Stoner and his colleagues fed rats an extract of black raspberries rich in
anthocyanins, which they found was almost as effective as whole berry powder
used in clinical trials in humans which required patients to take up to 60 grams
(2.1 ounces) of powder daily. “Now that we know the anthocyanins in berries
are almost as active as whole berries themselves, we hope to be able to prevent
cancer in humans using a standardized mixture of anthocyanins,” Stoner said.

The study results are published in the journal Cancer Prevention Research.