A higher rate of T3 and T4 stages was found for missed cancers ( 18 % , 5/28 ) compared to minimal signs ( 6 % , 2/31 ) or true ICs ( 8 % , 6/71 ) , while the rate of N2 and N3 stage for both minimal signs ( 19 % , 6/31 ) or missed cancers ( 25 % , 7/28 ) was higher than that for true ICs ( 10 % , 7/71 ) , although all these differences were not significant ( p 0.480 ) .