Table 2.

Group mean value of shear wave speed c in all 80 patients and collagen volume fraction (CVF) in a subgroup of 69 patients by pathology-based TN stage, LVI and PNI status, degree of tumor differentiation, prognostic stage, and risk level of all patients.

Prognostic factor	No. of patients (total n=80)	Shear wave speed c (m/s)	p value	No. of patients (total n=69)	CVF	p value
pT stage			<0.0001			0.0086
pT1-2	32	2.0 ± 0.4		27	0.13 ± 0.11
pT3-4	48	2.4 ± 0.5		42	0.21 ± 0.12
pN stage			0.013			<0.0001
pN0	54	2.2 ± 0.6		45	0.12 ± 0.091
pN1-2	26	2.5 ± 0.4		24	0.29 ± 0.097
LVI			0.017			0.1675
Negative	68	2.2 ± 0.5		57	0.17 ± 0.12
Positive	12	2.6 ± 0.5		12	0.23 ± 0.12
PNI			0.018			0.0269
Negative	72	2.2 ± 0.5		61	0.17 ± 0.12
Positive	8	2.7 ± 0.5		8	0.27 ± 0.11
Degree of tumor differentiation			0.040			0.0007
Well to moderately differentiated	71	2.2 ± 0.5		62	0.17 ± 0.11
Poorly differentiated	9	2.6 ± 0.5		7	0.32 ± 0.084
Prognostic stage			0.0022			<0.0001
Stage 0-I	26	1.9 ± 0.5		22	0.010 ± 0.082
Stage II-III	27	2.3 ± 0.6		20	0.15 ± 0.085
Stage III-IV	27	2.5 ± 0.4		27	0.27 ± 0.11
Risk stratification			<0.001			<0.001
Low-risk	44	2.1 ± 0.5		37	0.11 ± 0.08
High-risk	36	2.5 ± 0.5		32	0.27 ± 0.10

CVF, collagen volume fraction; LVI, lymphovascular invasion, PNI, perineural invasion. Prefix p in the stages represents pathology.