Which histologic type accounts for 80-90% of all breast cancer?

Which histologic type accounts for 80-90% of all breast cancer?

• A. Infiltrating Ductal Carcinoma
• B. Lobular Carcinoma
• C. Ductal Carcinoma In Situ
• D. Medullary Carcinoma

Answer: (A)

Infiltrating ductal carcinoma is the most common histologic type of breast cancer, accounting for roughly the majority of cases—about 80% or more. It starts in the breast ducts and, as it becomes invasive, penetrates the ductal basement membrane and invades surrounding breast tissue, forming the irregular masses we often see on exam or imaging. This dominant frequency is why it’s the best answer for a question asking which histologic type accounts for 80–90% of breast cancers. Lobular carcinoma makes up a smaller share and tends to be more often multifocal or bilateral. Ductal carcinoma in situ is noninvasive and thus not counted among invasive cancers. Medullary carcinoma is rare.

Infiltrating ductal carcinoma is the most common histologic type of breast cancer, accounting for roughly the majority of cases—about 80% or more. It starts in the breast ducts and, as it becomes invasive, penetrates the ductal basement membrane and invades surrounding breast tissue, forming the irregular masses we often see on exam or imaging. This dominant frequency is why it’s the best answer for a question asking which histologic type accounts for 80–90% of breast cancers. Lobular carcinoma makes up a smaller share and tends to be more often multifocal or bilateral. Ductal carcinoma in situ is noninvasive and thus not counted among invasive cancers. Medullary carcinoma is rare.