Table 1. Characteristics of affected family members (N = 30).

Clinical Characteristics	Value
Age at diagnosis [mean years]	41 ± 12, range 18-73
Female	26 (86.7%)
≥ 1 sibling affected	24 (80%)
Tumor size [mean in mm]#	14.27 ± 11.18
Histological Subtype
Classic PTC	27 (90%)
Follicular variant PTC	2 (6.7%)
Diffuse sclerosing variant PTC	1 (3.3%)
Lymph node metastases	12/18 (42.9%)
Distant metastases	0
Multifocality	19/29 (65.5%)
Lymphovascular invasion	3/21 (14.3%)
Extrathyroidal extension	5/29 (17.2%)
Recurrence	2/29 (6.8%)
Follow-up after surgery [mean years, range]	5.8 [0.2–31]

^#Largest tumor size when multifocal; values are mean ± standard deviation or n (%).

PTC: Papillary thyroid cancer.