Textural features in pre-treatment [F18]-FDG-PET/CT are correlated with risk of local recurrence and disease-specific survival in early stage NSCLC patients receiving primary stereotactic radiation therapy

Table 3 Kaplan-Meier analysis of overall and disease-specific survival

Parameter	Time to local recurrence (T2)							Overall survival					Disease-specific survival
	Cutoff	Low risk		High risk		P	Cutoff	Low risk		High risk		P	Cutoff	Low risk		High risk		P
		n	m	n	m			n	m	n	m			n	m	n	m
SUV_max	9.64	0	-	7	19.4	.052	11.2	12	36.0	16	25.2	.161	12.6	4	56.8	8	35.1	.080
SUV_mean	4.52	2	52.9	5	48.7	.459	5.02	15	33.7	13	26.7	.283	5.39	6	53.7	6	36.3	.296
Entropy	6.98	0	-	7	16.8	.001	6.83	11	38.3	17	24.8	.111	6.85	2	64.6	10	25.0	.003
Correlation	.453	3	61.0	4	10.6	.004	.228	10	39.3	18	25.7	.241	.319	5	55.5	7	34.0	.134
Contrast	231	3	44.8	4	53.1	.980	246	15	28.8	13	31.9	.790	222	4	47.1	8	46.6	.472
Busyness	.562	1	65.8	6	40.2	.042	.516	6	38.7	22	28.0	.338	.579	6	52.7	6	25.7	.081
Coarseness	.037	2	61.2	5	43.0	.193	.048	9	37.5	19	26.8	.338	.032	6	52.7	6	25.7	.081
COV	.522	1	52.8	6	50.3	.579	.669	14	34.0	14	26.6	.411	.527	4	56.5	8	35.5	.101
MTV	44.5	2	61.9	5	19.4	.111	18.0	6	43.4	22	28.3	.436	23.1	4	53.6	8	42.7	.151
CT diameter	39.0	2	58.0	5	48.6	.575	32.5	10	34.6	18	28.0	.235	32.5	3	54.0	9	43.0	.104

ISSN: 1748-717X