Table 1.

Proportion of the patients with low-risk papillary microcarcinoma who showed progression of the disease during the active surveillance according to age

	Age at presentation
	<40 years (%)	40–59 years (%)	≥60 years (%)
Enlargementa
At 5 years	9.1	5.0	4.0
At 10 years	12.1	9.1	4.0
Nodal metb
At 5 years	5.2	1.4	0.5
At 10 years	16.1	2.3	0.5

^aEnlargement of the tumor by 3 mm or more

^bAppearance of novel lymph node metastasis