Table 3.

Cumulative survival according to the presence and vertical extent of extrathyroidal extension (ENE).

	No ENE		ENE		Minor ENE		Major ENE		P values
	5-year	10-year	5-year	10-year	5-year	10-year	5-year	10-year	No vs. ENE	No vs. minor ENE	No vs. major ENE	Minor vs. major ENE
OS	95%	87%	64%	46%	76%	55%	44%	33%	<0.001	0.001	<0.001	0.024
DSS	97%	95%	71%	71%	87%	87%	48%	48%	<0.001	0.038	<0.001	0.005
DFS	90%	81%	65%	65%	76%	76%	47%	47%	<0.001	0.046	<0.001	0.016
DMFS	93%	91%	81%	81%	96%	96%	57%	57%	0.014	0.726	<0.001	0.001
RRFS	97%	90%	84%	84%	84%	84%	83%	83%	0.006	0.008	0.060	0.890
LRFS	97%	90%	89%	89%	91%	91%	83%	83%	0.098	0.282	0.093	0.400

OS overall survival, DSS disease specific survival, RFS recurrence free survival, DMFS distant metastasis free survival, RRFS regional recurrence free survival, LRFS local recurrence free survival.

P values were obtained using log rank test. Bold P values are significant P values.