Ductal Carcinoma in Situ
DCIS means abnormal cells are confined to milk ducts. Decisions aim to reduce the risk of future invasive disease while considering treatment burdens.
The key things to know
- DCIS is confined to the ducts.
- Treatment is based on extent, grade, margins, and preferences.
- Pure DCIS does not routinely require chemotherapy.
What stage 0 means
DCIS has not invaded the surrounding breast tissue. It is often found as calcifications on a mammogram rather than as a lump. A biopsy establishes the diagnosis, but the complete surgical specimen may occasionally reveal an invasive area that was not sampled initially. DCIS is different from invasive breast cancer and from atypical hyperplasia; the wording of the pathology report matters.
How treatment is selected
Breast-conserving surgery is suitable for many people, usually with consideration of radiotherapy afterward. Mastectomy may be appropriate when DCIS is extensive, affects separate areas, or cannot be removed with acceptable clear margins. Estrogen-receptor-positive DCIS may lead to a discussion about endocrine therapy to reduce future breast events. Chemotherapy is not standard treatment for pure DCIS.
Nodes and emerging approaches
Routine underarm staging is generally unnecessary for pure DCIS treated with ordinary breast conservation. Sentinel-node biopsy is often discussed with mastectomy because reliable mapping may not be possible later if invasion is found. Active monitoring is being studied for carefully selected low-risk DCIS; eligibility, longer-term evidence, and local expertise must be discussed rather than assuming it is appropriate for everyone.
After treatment
The prognosis is generally very favourable, but follow-up still matters. Ask about your margins, grade, extent, and whether further treatment lowers your own recurrence risk enough to justify its effects. Attend recommended imaging and report new changes. Anxiety after a stage 0 diagnosis is understandable; clear explanations and support can make the choices less overwhelming.
Take these questions to your appointment
- How extensive is the DCIS?
- What benefit would radiotherapy or endocrine therapy add for me?
Sources & review
This is original educational content based on the sources below, not reproduced textbook material. Website supervisor: Dr. Nizar Ismail. Individual medical review of this article is pending.
This information cannot replace diagnosis or a personal treatment plan. Consult your care team about symptoms or decisions about your treatment.