Table 1.

Clinico-pathologic characteristics of patients with unifocal oncocytic noninvasive encapsulated follicular variant of papillary thyroid carcinoma (O-NI-EFVPTC) who did not receive post-operative radioactive iodine treatment.

All patients (n = 61)
Site	MSKCC, US	34	56%
	Bologna, Italy	22	36%
	SHSC, Canada	5	8%
Sex	Female	42	69%
	Male	19	31%
Age: mean, median (range)		52, 56 (8–82)
Surgical procedure	Lobectomy	28	46%
	Total/subtotal thyroidectomy	33	54%
Tumor sampling	Entirely or entire capsule	37	61%
	Representative	24	39%
Number of sections sampled per tumor in cases that were representatively sampled: mean, median (range)		5, 4 (2–12)
Number of sections per cm of tumor in cases that were representatively sampled: mean, median (range)		2,2 (1–4)
Tumor Size(cm): mean, median (range)		2.5, 2.5 (1.0 −5.0)
Background Thyroid	Chronic lymphocytic thyroiditis	9	15%
	Nodular hyperplasia	28	46%
	Other/none	25	41%
Sampling and status of lymph nodes	Not sampled	49	80%
	Benign lymph node(s)	12	20%
Post-operative radioactive iodine	None	61	100%
Follow up (FU) duration (years): mean, median (range)		7.2, 5.3 (0.1–20.5)
Disease status at last FU	No evidence of disease (NED)	61	100%
Patients with at least 1-year FU (n = 55)
Surgical procedure	Lobectomy	26	47%
	Total/subtotal thyroidectomy	29	53%
FU duration (years): mean, median (range)		7.9, 6.7 (1–20.5)
Disease status at last FU	NED	55	100%
Patients with at least 2-year FU (n = 52)
Surgical procedure	Lobectomy	23	44%
	Total/subtotal thyroidectomy	29	56%
FU duration (years): mean, median (range)		8.3, 6.9 (2.7 −20.5)
Disease status at last FU	NED	52	100%
Patients with at least 5-year FU (n = 33)
Surgical procedure	Lobectomy	17	52%
	Total/subtotal thyroidectomy	16	48%
FU duration(years):mean, median (range)		10.9, 10.2 (5.1–20.5)
Disease status at last FU	NED	33	100%