Fundamentally that study isn't really saying much to you as an individual. Prostate problems are often the result of incorrect ratios, such as T/E ratio, or too much T becoming DHT, these are known problems and why dutasteride is often prescribed. What soy can be about is if E might be a problem for you as an individual, such as your T/E ratio is well below 10 for example. That study posted talks about general trends in various countries and doesn't even address what soy does, which is help with a bit too much estrogen. Elevated estrogen is common today, plastics, and non stick coating and so on may push estrogens a bit too much for you to maintain a good ratio, so some soy can be helpful for some. It certainly isn't for everyone, and maybe in some countries there is less exposure to environmental problems so that study may relate to that, but when it comes down to it, you have to look at yourself as an individual and what may benefit you. This is sort of lost in todays medicine but anyway, we can bring it to doctors attention if one looks into these things.