This was based on the SELECT trial data, which means that it could just as easily be measuring the effects of a very large and prolonged dose of 400 IU of alpha

This was based on the SELECT trial data, which means that it could just as easily be measuring the effects of a very large and prolonged dose of 400 IU of alpha-tocopherol as it is omega-3. Greater than 12x RDA. Moreover, it's been many years since this was published. If prostate cancer-promoting effects were so plainly an obvious effect of marine omega-3 supplementation, you'd expect to have seen it abundantly replicated by now.