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And invasive treatments that they really don't need. now, new tests are showing promise in reducing the number of these false alarms. talk about it with dr. david samati, chief of the robotics division at mt. sinai school of medicine and fox news medical a-teamer and in treatment of prostate cancer. psa test as you always has been the standard but the problem is gives a lot of false-positives is is that true. >> that stands for prostate specific antigen. many things such as enlarged prostate, inflammation of prostate and prostate cancer can bump up the psa that is part of the problem we're hav...

It's treated with things like an gee plasties and stents and bypass surgery. what does the evidence really show? unless you're in the middle of having a heart attack, which 95% of people who get them are not, they don't prolong your life, they don't even prevent heart attacks. we have a model that works simply by making changes in diet and lifestyles. >> now to a new study that shows diet may be a key tool in the fight against cancer. the study was conducted by dr. dean ornish, who looked at patients with early stage prostate cancer. >> more than half of men over the age of 50 get a psa test e...

And lifestyles. >> now to a new study that shows diet may be a key tool in the fight against cancer. the study was conducted by dr. dean ornish, who looked at patients with early stage prostate cancer. >> more than half of men over the age of 50 get a psa test every year to try to detect prostate cancer early. it turns out lots and lots of men who had a cancer that didn't need to be treated, but they got treated anyway and it was causing a lot of harm. >> there's very little evidence that these conventional treatments make you live longer, but they cause many men to be impotent or incontinent ...

Than anything combined. unless you're in the middle of having a heart attack, which 95% of people who get them are not, they don't prolong your life, they don't even prevent heart attacks. we have a model that works simply by making changes in diet and lifestyles. >> now to a new study that shows diet may be a key tool in the fight against cancer. the study was conducted by dr. dean ornish, who looked at patients with early stage prostate cancer. >> more than half of men over the age of 50 get a psa test every year to try to detect prostate cancer early. it turns out lots and lots of men who h...

>> now to a new study that shows diet may be a key tool in the fight against cancer. the study was conducted by dr. dean ornish, who looked at patients with early stage prostate cancer. >> more than half of men over the age of 50 get a psa test every year to try to detect prostate cancer early. it turns out lots and lots of men who had a cancer that didn't need to be treated, but they got treated anyway and it was causing a lot of harm. >> there's very little evidence that these conventional treatments make you live longer, but they cause many men to be impotent or incontinent or both. >> my p...