It was significantly related to regional lymph node metastasis (31.3% in pN1 vs. 5.1% in pN0, p =0.002). Rate of pM1 - LN was 29.2% , 20.8% , and 10% for Ut, Mt, and Lt. Forty - eight patients (55.2% ) had pN1 disease.

• 颈淋巴结转移(pM1-LN)17例(占全组的19.；5%25和三野清扫组的48