In the DES group , the 2-year EFS was 92.0 % vs. 85.0 % ( p = 0.61 ) , freedom from TLR was 96.0 % vs. 85.5 % ( p = 0.55 ) , primary patency was 80.0 % vs. 74.3 % ( p = 0.61 ) , and clinical benefit was sustained in 88.5 % vs. 80.5 % of patients ( p = 0.31 ) in the Japanese and non-Japanese cohorts , respectively .