The stage - specific sensitivity, specificity and accuracy for N staging of gastric cancers were Se 50%, Sp 95, 6%, Acc 80% for N0; Se 66.7%, Sp 75%, Acc 74.2% for N1; Se 50%, Sp 75.7%, Acc 74.2% for N2; Se 50%, Sp 100%, Acc 74.2% for N3.