Microscopic Positive Tumor Margin Increases Risk for Disease Persistence but Not Recurrence in Patients with Stage T1-T2 Differentiated Thyroid Cancer

Table 3

RAI treatment: positive versus clear margins.

	All patients n = 963	Positive margins n = 112	Clear margins n = 851	value
Initial RAI ablation
Received RAI	761 (79%)	103 (92%)	658 (77%)	<0.001
RAI dose (GBq)	3.7 (1.1–7.4)	3.7 (1.8–5.5)	3.7 (1.1–7.4)
T1 patients (n = 603)
Received RAI	421 (70%)	50 (86%)	371 (68%)	0.004
RAI dose (GBq)	3.7 (1.1–5.7)	3.7 (1.8–5.5)	3.7 (1.1–5.7)
T2 patients (n = 360)
Received RAI	340 (94%)	53 (98%)	287 (93%)	0.180
RAI dose (GBq)	3.7 (1.1–7.4)	3.7 (3.7–5.5)	3.7 (1.1–7.4)

Data are presented as number (percentage) or median (range). Positive versus clear margins. Patient was treated with RAI in 1996, unexplained high dose. for comparison with fraction of patients receiving RAI in T1 patients.