I have a query that is returning some data with some code concatenated in front as such:

rtf1\ansi\ansicpg1252\uc0\deff0{\fonttbl {\f0\froman\fcharset0\fprq2 Times New Roman;} {\f1\froman\fcharset2\fprq2 Symbol;}} {\colortbl;\red1\green0\blue0;\red255\green255\blue255;} {\*\generator TX_RTF32 10.1.323.501;} \deftab1134\pard\qj\li120\ri240\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\tx9360\tx10080\plain\f0\fs24\cf1\tab  Then the data is placed here.

How can I get rid of the preceding text?

Are you getting the data correctly in the PCC?  Are you getting this in your application?  It looks like an RTF string prior to the data.