Major complications and side-effects of the treatment were severe chest pain ( 17 [ 23 % ] of 73 patients in the irradiation group vs 15 [ 20 % ] of 75 patents in the control group ) , fistula formation ( six [ 8 % ] vs five [ 7 % ] ) , aspiration pneumonia ( 11 [ 15 % ] vs 14 [ 19 % ] ) , haemorrhage ( five [ 7 % ] vs five [ 7 % ] ) , and recurrent dysphagia ( 21 [ 28 % ] vs 20 [ 27 % ] ) .