Table 1 Clinicopathologic features of triple negative breast cancers

Age at dignosis

Mean ± SD (years)

48.4 ± 12.3

Age specific groups, N (%)

< 30 years

15 (7.3%)

31-40 years

47 (22.9%)

41-50 years

61 (29.8%)

51-70 years

70 (34.1%)

> 70 years

12 (5.9%)

Tumor size

Mean ± SD (mm)

38.2 ± 16.2

Size specific groups, n (%)

≤ 2.0 cm (pT1)

14 (12.7%)

2.0-5.0 cm (pT2)

81 (73.6%)

> 5.0 cm (pT3)

15 (13.6%)

Without surgery/trucut biopsy^$

95

Histological type, n (%)

Infiltrating ductal carcinoma (NOS)

158 (77.1%)

Infiltrating lobular carcinoma

05 (2.4%)

Metaplastic carcinoma

22 (10.7%)

Invasive papillary carcinoma

07 (3.4%)

Infiltrating carcinoma with medullary features

12 (5.9%)

Missed ductal and lobular carcinoma

01 (0.5%)

Histologic grade, n (%)

Grade I (well differentiated)

Grade II (moderately differentiated)

Grade III (poorly differentiated)

10 (4.9%)

65 (31.7%)

130 (63.4%)

Lymphovascular invasion, n (%)

Present

Not present

Cannot be assessed^$

30 (27.3%)

80 (72.7%)

95

Necrosis, n (%)

Geographic necrosis involving > 40% of tumor

Necrosis involving < 40% of tumor

Necrosis is absent

34 (30.9%)

Cannot be completely assessed^$

72 (65.5%)

04 (3.6%)

95

Lymphocytic infiltration, n (%)

Extensive lymphocytic infiltration

21 (19.1%)

Mild to moderate lymphocytic infiltration

89 (80.9%)

Cannot be completely assessed^$

95

Lymph node status, n (%)

Negative lymph nodes (N0)

57 (51.8%)

1-3 positive lymph nodes (N1)

24 (21.8%)

4-9 positive lymph nodes (N2)

11 (10.0%)

≥ 10 positive lymph nodes (N3)

18 (16.4%)

Lymph nodes dissection not done

95

Extranodal extension, n (%)

Present

Not present

15 (13.6%)

Lymph nodes dissection not done

95 (86.4%)

95

Ki-67 proliferation index

Mean ± SD (%)

45.2 ± 25.2

Ki-67 proliferation index, (categories), n (%)

≤ 15% (low)

16-30% (Intermediate)

>30% (High)

32 (15.6%)

37 (18.0%)

136 (66.3%)

Type of surgery n (%)

Modified radical mastectomy

Breast conservation surgery

Surgery not done/trucut biopsy

90 (43.9%)

15 (7.3%)

95 (46.3%)

Laterality n (%)

Right

94 (45.9%)

Left

111 (54.1%)