The 10 - and 20-year survival was 77 % ( 95 % CI 66-85 % ) and 64 % ( 95 % CI 52-75 % ) for patients receiving LSS alone and 82 % ( 95 % CI 72-90 % ) and 71 % ( 95 % CI 59-81 % ) for patients receiving EBRT ( p = 0.22 ) .