Table 3. Association between sonographic features and TNBC molecular subtypes based on the FUSCC classification criteria.

	Number	IM	LAR	MES	BLIS	P
Orientation						0.529
Parallel	100	20 (95.2)	15 (83.3)	30 (83.3)	35 (89.7)
Not parallel	14	1 (4.8)	3 (16.7)	6 (16.7)	4 (10.3)
Shape						0.008*
Regular	43	11 (52.4)	2 (11.1)	10 (27.8)	20 (51.3)
Irregular	71	10 (47.6)	16 (88.9)	26 (72.2)	19 (48.7)
Margin						0.439
Circumscribed	12	3 (14.3)	1 (5.6)	2 (5.6)	6 (15.4)
Not circumscribed	102	18 (85.7)	17 (94.4)	34 (94.4)	33 (84.6)
Angular/spiculated margin						0.055
Yes	38	6 (28.6)	10 (55.6)	14 (38.9)	8 (20.5)
No	76	15 (71.4)	8 (44.4)	22 (61.1)	31 (79.5)
Echo pattern						0.180
Hypoechoic	55	15 (71.4)	7 (38.9)	14 (38.9)	19 (48.7)
Mixed	57	6 (28.6)	10 (55.6)	22 (61.1)	19 (48.7)
Solid and cystic	2	0 (0)	1 (5.6)	0 (0)	1 (2.6)
Posterior acoustic pattern						0.028*
Shadow	8	0 (0)	3 (16.7)	5 (13.9)	0 (0)
Enhancement	43	9 (42.9)	4 (22.2)	9 (25)	21 (53.8)
No change	53	10 (47.6)	11 (61.1)	17 (47.2)	15 (38.5)
Mixed	10	2 (9.5)	0 (0)	5 (13.9)	3 (7.7)
Posterior acoustic shadow						0.021*
Yes	8	0 (0)	3 (16.7)	5 (13.9)	0 (0)
No	106	21 (100.0)	15 (83.3)	31 (86.1)	39 (100.0)
Posterior acoustic enhancement						0.031*
Yes	43	9 (42.9)	4 (22.2)	9 (25)	21 (53.8)
No	71	12 (57.1)	14 (77.8)	27 (75)	18 (46.2)
Calcification						0.549
Yes	32	4 (19.0)	5 (27.8)	13 (36.1)	10 (25.6)
No	82	17 (81.0)	13 (72.2)	23 (63.9)	29 (74.4)
US features-based groups						0.013*
Group 1	31	7 (33.3)	2 (11.1)	8 (22.2)	14 (35.9)
Group 2	66	14 (67.7)	10 (55.6)	19 (52.8)	23 (59.0)
Group 3	17	0 (0)	6 (33.3)	9 (25.0)	2 (5.1)

* indicates statistical significance.