RUNAWAY AUTO THROTTLE BODY STICKING CAUSED CAR TO BECOME A RUNAWAY AUTO WITH NO CONTROL TO STOP. EXITING HIGHWAY 80 AT PRNRYN RD. EXT. CRUISE CONTROL SHUT OFF AUTO SPEEDED UP ENJINE ROARED APPLIING BRAKES DIDN'T STOP AUTO. WENT OFF ROAD AND STRUCK A LARGE OAK TREE. VEHICLE OVERTURNED DOWN AN EMBANKMEND. LANDED ON ROOF OF AUTO. AUTO HAD 450 MILES ON IT AND WAS TOTALLY DESTROYED.