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| Histologic type | No. of patients (%) |
|---|---|
| Ductal carcinoma in situ | 1,164 (13.2) |
| Invasive ductal carcinoma | 6,088 (68.9) |
| Lobular carcinoma in situ | 76 (0.8) |
| Invasive lobular carcinoma | 333 (3.8) |
| Paget's disease (pure form) | 8 (< 0.1) |
| Malignant phyllodes tumor | 35 (0.4) |
| Lymphoma | 4 (< 0.1) |
| Sarcoma | 6 (< 0.1) |
| Others | 137 (1.5) |
| Unknown | 982 (11.1) |
| Total | 8,833 (100) |
KBCS=Korean Breast Cancer Society.
