Ductal carcinoma in situ (DCIS)

This section is about ductal carcinoma in situ (DCIS). It describes the causes and symptoms of DCIS and explains how it is diagnosed and treated.

Quick facts

DCIS is the earliest possible form of breast cancer and is non-invasive.
Although DCIS needs to be treated, it isn’t a life-threatening condition.
Surgery is the most common treatment.

This information is about DCIS. We also have information about:

primary breast cancer in women
breast cancer that has spread to other parts of the body or come back after treatment (secondary breast cancer)
breast cancer in men.

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Macmillan Cancer Support, registered charity in England and Wales (261017), Scotland (SC039907) and the Isle of Man (604). A company limited by guarantee, registered in England and Wales company number 2400969. Isle of Man company number 4694F. Registered office: 89 Albert Embankment, London SE1 7UQ.

Ductal carcinoma in situ (DCIS)

Quick facts

About DCIS

Treating DCIS

Further resources

Symptoms and diagnosis