I'm going off memory so please excuse any errors.
Just looked at showthread.php and it doesn't seem to contain a general thing to pull thread info out of the database. Your probably going to have to put a new database call in there. I believe there is code that will do this for you in forumdisplay.php, the part which downloads into the $thread variable.
On you should then be able to extract things by calling the variable $thread[yourinfo] etc.
Sorry I haven't time to look into it properly
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