Table 1.

Inclusion criteria of different AS protocols

AS protocol	Clinical Stage	PSA	Gleason	Positive Cores	Core Positivity (%)
Tosoian et al. (15)	<T2a	—	≤3+3	≤2	≤50%
Klotz et al. (16)		≤10*	≤3+3*	—	—
Bul et al. (17)	≤T2	≤10	≤3+3	≤2
Dall'Era et al. (18)	≤T2a	≤10	≤3+3	≤33%	≤50%
Berglund et al. (19)	≤T2a	≤10	≤3+3	≤3	≤50%
Van As et al. (20)	≤T2a	≤15	≤3+3	≤50%	—
Soloway et al. (21)	≤T2a	≤10	≤3+3	≤2	≤20%

^*Until 1999, PSA ≤ 15 and Gleason ≤ 3+4 was used