| Histology (ICD-O) (1) | Cases | % | Histology (ICD-O) (1) | Cases | % | |
| (8000) Malignant neoplasm | 100 | 0.12 | (8490) Signet ring cell carcinoma | 54 | 0.06 | |
| (8001) Malignant tumor cells | 27 | 0.03 | (8500) Infiltrating duct carcinoma | 60,283 | 71.62 | |
| (8003) Giant cell type malignant tumor | 1 | 0 | (8501) Comedocarcinoma, NOS | 2,302 | 2.73 | |
| (8010) Carcinoma, NOS | 1,376 | 1.63 | (8502) Juvenile carcinoma of the breast | 6 | 0.01 | |
| (8012) Large cell carcinoma, NOS | 15 | 0.02 | (8503) Intraductal papillary adenocarcinoma with invasion | 232 | 0.28 | |
| (8020) Undifferentiated carcinoma, NOS | 48 | 0.06 | (8504) Intracystic carcinoma, NOS | 102 | 0.12 | |
| (8021) Anaplastic carcinoma, NOS | 25 | 0.03 | (8510) Medullary carcinoma, NOS | 1,391 | 1.65 | |
| (8022) Pleomorphic carcinoma | 4 | 0 | (8512) Medullary carcinoma with lymphoid stroma | 48 | 0.06 | |
| (8030) Giant cell and spindle cell carcinoma | 2 | 0 | (8520) Lobular carcinoma, NOS | 5,858 | 6.96 | |
| (8031) Giant cell carcinoma | 2 | 0 | (8521) Infiltrating ductular carcinoma | 219 | 0.26 | |
| (8032) Spindle cell carcinoma | 21 | 0.02 | (8522) Infiltrating duct and lobular carcinoma | 3,753 | 4.46 | |
| (8033) Pseudosarcomatous carcinoma | 3 | 0 | (8530) Inflammatory carcinoma | 1,149 | 1.36 | |
| (8041) Small cell carcinoma, NOS | 21 | 0.02 | (8540) Paget's disease, mammary | 67 | 0.08 | |
| (8050) Papillary carcinoma, NOS | 182 | 0.22 | (8541) Paget's disease and infiltrating duct carcinoma | 431 | 0.51 | |
| (8070) Squamous cell carcinoma, NOS | 35 | 0.04 | (8543) Paget's disease and intraductal carcinoma | 292 | 0.35 | |
| (8071) Keratinizing squamous cell carcinoma, NOS | 2 | 0 | (8550) Acinar cell carcinoma | 4 | 0 | |
| (8074) Spindle cell squamous cell carcinoma | 3 | 0 | (8560) Adenosquamous carcinoma | 19 | 0.02 | |
| (8140) Adenocarcinoma, NOS | 2,188 | 2.6 | (8562) Epithelial-myoepithelial carcinoma | 2 | 0 | |
| (8141) Scirrhous adenocarcinoma | 176 | 0.21 | (8570) Adenocarcinoma with squamous metaplasia | 4 | 0 | |
| (8190) Trabecular adenocarcinoma | 1 | 0 | (8572) Adenocarcinoma with spindle cell metaplasia | 1 | 0 | |
| (8200) Adenoid cystic carcinoma | 57 | 0.07 | (8800) Sarcoma, NOS | 11 | 0.01 | |
| (8201) Cribriform carcinoma | 109 | 0.13 | (8801) Spindle cell sarcoma | 6 | 0.01 | |
| (8211) Tubular adenocarcinoma | 1,033 | 1.23 | (8810) Fibrosarcoma, NOS | 6 | 0.01 | |
| (8230) Solid carcinoma, NOS | 1 | 0 | (8830) Malignant fibrous histiocytoma | 8 | 0.01 | |
| (8240) Malignant carcinoid tumor | 7 | 0.01 | (8832) Dermatofibrosarcoma, NOS | 1 | 0 | |
| (8244) Composite carcinoid | 2 | 0 | (8850) Liposarcoma, NOS | 2 | 0 | |
| (8246) Neuroendocrine carcinoma | 5 | 0.01 | (8852) Myxoid liposarcoma | 5 | 0.01 | |
| (8251) Alveolar adenocarcinoma | 1 | 0 | (8858) Dedifferentiated liposarcoma | 1 | 0 | |
| (8260) Papillary adenocarcinoma, NOS | 109 | 0.13 | (8890) Leiomyosarcoma, NOS | 7 | 0.01 | |
| (8290) Oxyphilic adenocarcinoma | 1 | 0 | (8930) Stromal sarcoma, NOS | 6 | 0.01 | |
| (8310) Clear cell adenocarcinoma, NOS | 7 | 0.01 | (8933) Adenosarcoma | 1 | 0 | |
| (8314) Lipid-rich carcinoma | 1 | 0 | (8980) Carcinosarcoma, NOS | 17 | 0.02 | |
| (8315) Glycogen-rich carcinoma | 2 | 0 | (9020) Malignant Phyllodes tumor | 152 | 0.18 | |
| (8323) Mixed cell adenocarcinoma | 4 | 0 | (9120) Hemangiosarcoma | 30 | 0.04 | |
| (8330) Follicular adenocarcinoma, NOS | 1 | 0 | (9170) Lymphangiosarcoma | 1 | 0 | |
| (8401) Apocrine adenocarcinoma | 79 | 0.09 | (9180) Osteosarcoma, NOS | 3 | 0 | |
| (8470) Mucinous cystadenocarcinoma, NOS | 1 | 0 | (9220) Chondrosarcoma, NOS | 3 | 0 | |
| (8480) Mucinous adenocarcinoma | 1,911 | 2.27 | ||||
| (8481) Mucin-producing adenocarcinoma | 136 | 0.16 | Total | 84,176 | 100 |
Source: California Cancer Registry, November 1994. Excludes lymphohematopoietic neoplasms of the breast (ICD-O, Field Trial edition, histology codes 9590-9970) (2).
1 Numbers in parentheses are ICD-O, Field Trial edition, histology codes (2). NOS=not otherwise specified.
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