The following is a list of breast cancer histologic classifications.[1] Infiltrating or invasive ductal cancer is the most common breast cancer histologic type and comprises 70% to 80% of all cases.

• Carcinoma, NOS (not otherwise specified). 
• Ductal.
  • Intraductal (in situ).
  • Invasive with predominant intraductal component.
  • Invasive, NOS.
  • Comedo.
  • Inflammatory.
  • Medullary with lymphocytic infiltrate.
  • Mucinous (colloid).
  • Papillary.
  • Scirrhous.
  • Tubular.
  • Other.

   

• Lobular.
  • In situ.
  • Invasive with predominant in situ component.
  • Invasive.[2]

   

• Nipple.
  • Paget disease, NOS.
  • Paget disease with intraductal carcinoma.
  • Paget disease with invasive ductal carcinoma.

   

• Other.
  • Undifferentiated carcinoma.

   

The following are tumor subtypes that occur in the breast but are not considered to be typical breast cancers:

• Phyllodes tumor.[3,4]
• Angiosarcoma.
• Primary lymphoma.