TABLE 2.

The results from machine learning.

Algorithm	Study	Accuracy	Sensitivity	Specificity	AUC	End point
PNN	Obrzut et al. (2017)	0.9	1.0			5 year-survival
	Obrzut et al. (2019)		0.9	0.7		10-Survival
Network in network	Shen et al. (2019)	89.0	71.0	93.0		Recurrence
		87.0	77.0	90.0		Metastasis
CNN	Zhen et al. (2017)		72.0	59.0	0.700	Rectal toxicity
SVM	Chen et al. (2018b)		87.8	79.9	0.910	Rectal toxicity
SVM	Tian et al. (2019)		97.1	88.5	0.904	Radiation-induced fistula