This report is interesting - tinyurl.com/24fnxa.
Yes, it is interesting but go to any nutrition talk at BCC, Breast Cancer Haven, Maggie’s etc. and they’ll all recommend that you should target all the colourful stuff in the fruit & veg department, the darker the better.
It was more that they are having interesting results from the extracted anthocyanins in laboratory tests in controlling tumour growth.
Chokeberries, which have the highest level, are usually inedible, though they can be used in cookery.