Table 4.

Local tumor progression rate in high‐risk and low‐risk groups

Parameter	Training dataset			Validation dataset
	High‐risk group	Low‐risk group	Total	High‐risk group	Low‐risk group	Total
No. of patients	103	437	540	89	277	366
No. of LTP	19	16	35	12	14	26
At 1 y	9.8%	0.9%	2.6%	4.7%	2.5%	3.0%
At 2 y	12.1%	2.3%	4.2%	9.2%	2.9%	4.3%
At 3 y	18.8%	4.3%	7.1%	14.9%	3.9%	6.4%
At 4 y	20.8%	4.3%	7.5%	17.5%	3.9%	7.0%
At 5 y	20.8%	4.3%	7.5%	17.5%	6.1%	8.6%

Abbreviation: LTP, local tumor progression.