The patients were categorized into 3 groups according to the results of these 2 examinations, i.e., patients with 1) both histologically and K19 RT-PCR negative lymph nodes (metastases negative group [n = 91]); 2) histologically negative but K19 RT-PCR positive lymph nodes (occult metastases positive group [ n = 15]); and 3) histologically positive lymph nodes (metastases positive group [n = 20]).