According to the 4th edition of the WHO Histological Classification of Breast Tumours 2012, invasive breast cancer is classified as.
(1) Non-specific invasive carcinoma, which is the largest group of invasive breast cancers and contains the largest number of types. It includes invasive lobular carcinoma, including classic lobular carcinoma, solid lobular carcinoma and glandular follicular lobular carcinoma, etc.
(2) Special types of carcinoma: tubular carcinoma, also known as highly differentiated adenocarcinoma. There are also sieve carcinomas, mucinous carcinomas, carcinomas with medullary-like features, and carcinomas with differentiation of the sweat glands.