This article by NCI states Japanese traditional vinegar from unpolished rice , inhibits the proliferation of a variety of human cancer cells, including prostate carcinoma (LNCaP) , in a dose-dependent manner .
The dosage formula is not provided , possibly depends on your weight
Vinegar is an acid and will make your blood highly acidic. Also vinegar is the only eatable substance that breaks down the sugar in your blood for this reason is highly antiglycemic. See this article
Please Google Vinegar diet, to learn more.
Sometimes I eat couple of pieces of cheese cake, to counter balance the sugar, I drink a large glass of Rice Vinegar- don’t try it at home.
Back to serious, an ethyl acetate extract of Kurosu (Japanese rice vinegar) added to drinking water (0.05% to 0.1% w/v) significantly inhibited cancer cell proliferation.
I don’t know, how much of Rice vinegar we should add to our diet to benefit from it. May be someone else can look into it.