Mike...This text is taken from the Description for DNAPrint's Ancestry Informative Markers Patent Application. There is a link to the complete description in my post #12882.
That's the only reference I have seen and haven't spent any time researching the significance of PSCA in general.
The figures will be in the complete application which may not be available for some time. I'd look for them to be published at ESpace.net at some point in the future: