Table 3. Four cases of recurrence

Recurred patients	Case A	Case B	Case C	Case D
Sex/Age	Female/69	Male/51	Male/68	Female/85
Tumor side and pathologic stage	Lt,pT1N1	Lt,pT2N0	Rt,pT2N0	Lt,pT1N0
Disease free survival (month)	7.5	6.0	7.0	6.0
SLN site	Lt.II	Lt.IV	Rt.Parapharynx	Lt.II,III
SCND	Lt.mRND	Lt.IV	Rt.IB,II	Lt.II,III
Recurred LN	Lt.IB	Lt.I,II	Rt.II	Lt.I
Adjuvant therapy	PORT	PORT	Chemotherapy	-

LN: lymph node,SCND: sentinel lymph node centered selective neck dissection,mRND: modified radical neck dissection,PORT: postoperative radiation therapy.
Pathologic stage refers to the initial surgical pathology before recurrence.