Which type of breast cancer is the most common?

Infiltrating ductal carcinoma is recognized as the most common type of breast cancer, accounting for approximately 80% of all breast cancer diagnoses. This type of cancer originates in the milk ducts and has the ability to spread to surrounding breast tissue. The prominence of infiltrating ductal carcinoma among breast cancer types is due to its distinct biological characteristics, which involve the growth pattern and the tendency for these tumors to be detected during screening processes.

The other types of breast cancer mentioned, while also significant, do not represent the majority of cases. In situ carcinoma, for example, refers to cancers that have not invaded surrounding tissues and are often considered early-stage cancers. Infiltrating lobular carcinoma, although it represents a notable subset of breast cancers, is less common than infiltrating ductal carcinoma. Meanwhile, Paget's disease of the nipple is a rare form of breast cancer that typically presents with skin changes in the nipple area and is often associated with underlying ductal carcinoma but is not a primary form of breast cancer itself.

Understanding the prevalence of infiltrating ductal carcinoma is critical for clinical practice, as it impacts screening, diagnosis, and management strategies for patients.