Table 1.

Distribution of histologic tumor types and lymph node features according to the adapted metastasis classification used in humans

	Absence of Metastasis Group A (n [%]) (n = 33)	Macrometastases Group B (n [%]) (n = 13)	Micrometastases Group C (n [%]) (n = 15)	Isolated Tumor Cells Group D (n [%]) (n = 9)	No Measurable Metastasis Group E (n [%]) (n = 20)
Histologic types (n = 90)
MTC	24 [72.7]	4 [30.8]	3 [20.0]	3 [33.3]	1 [5.0]
SC	3 [9.1]	1 [7.7]	2 [13.3]	1 [11.1]	9 [45.0]
RTMT*	2 [6.1]	6 [46.2]	2 [13.3]	0 [0]	8 [40.0]
PTC**	2 [6.1]	0 [0]	7 [46.7]	3 [33.3]	1 [5.0]
CSS	2 [6.1]	2 [15.4]	1 [6.7]	2 [22.2]	1 [5.0]
Lymph node metastasis area (n = 33)
<20.11 mm²	0 [0]	6 [54.5]	14 [100]	8 [100]	0 [0]
>20.11 mm²	0 [0]	5 [45.5]	0 [0]	0 [0]	0 [0]
Lymph node metastatic foci (n = 33)
<28 foci	0 [0]	11 [100]	13 [92.9]	6 [75]	0 [0]
>28 foci	0 [0]	0 [0]	1 [7.1]	2 [25]	0 [0]
Lymph node maximum diameter (n = 33)
<7.32 mm	0 [0]	5 [45.5]	14 [100]	8 [100]	0 [0]
>7.32 mm	0 [0]	6 [54.5]	0 [0]	0 [0]	0 [0]
Lymph node total metastatic area (n = 24)
<88.92 mm²	0 [0]	3 [50]	13 [100]	5 [100]	0 [0]
<88.92 mm²	0 [0]	3 [50]	0 [0]	0 [0]	0 [0]

MTC, carcinoma in mixed tumor; SC, solid carcinoma; RTMT*, rare type malignant mammary tumors (including micropapillary carcinoma, n = 14; lipid‐rich carcinoma, n = 1; pleomorphic lobular carcinoma, n = 1; malignant adenomyoepithelioma, n = 1; and malignant phyllodes tumor, n = 1); PTC**, (including papillary carcinoma, n = 10; and tubular carcinoma, n = 3); CSS, carcinosarcoma.