What is ductal carcinoma in situ (DICS)?

Ductal carcinoma in situ (DCIS) is often also referred to as a pre-stage of breast cancer. There are already cancerous cells. However, they are only growing within the milk duct, without any substantial tie to the vascular system, and do not form lumps yet. Pre-stages of cancer cannot be felt.

They can be very small but also extend far into the milk ducts without being noticed. Over time, a DCIS can turn into invasive breast cancer, and namely a cancer, which grows into the surrounding tissue and becoming dangerous for the woman.

There are different types of DCIS. Some grow slowly, others very rapidly. Some spread to surrounding tissue early, others later or not at all.

Some DCIS would not have been detected without an early detection screening, as it would not have become malignant and no palpable lump would have formed.