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Lobular Carcinoma in Situ (LCIS) is not breast cancer, but it does increase a person’s risk of developing breast cancer in the future. LCIS is best described as a marker of increased risk, rather than a disease that needs cancer treatment.
What Is LCIS?
LCIS occurs when abnormal cells grow in the milk-producing glands (lobules) of the breast. Despite its name, LCIS:
Is not invasive
Does not spread beyond the lobules
Is not life-threatening
Usually causes no symptoms
LCIS is often found incidentally during a biopsy performed for another reason, such as a mammogram finding or a benign breast lump.
How Does LCIS Affect Breast Cancer Risk?
While LCIS is not a disease that requires cancer treatment, it does increase a patient’s lifetime risk of developing breast cancer.
Importantly, LCIS itself does not turn into cancer, but it signals that the breast tissue is more susceptible to cancer development over time.
People with LCIS are estimated to have a 7–12 times higher risk of developing breast cancer compared to the general population.
The increased risk applies to both breasts, not just the breast where LCIS was found.
LCIS can increase the risk of both invasive ductal cancer and invasive lobular cancer.
Who Is Most Commonly Diagnosed With LCIS?
LCIS is most often diagnosed in:
Women between the ages of 40 and 60
Individuals undergoing breast biopsies for abnormal imaging
People with additional risk factors, such as:
A family history of breast cancer
Dense breast tissue
Hormonal or reproductive risk factors
LCIS can also occur in men, though this is rarer.
How Is LCIS Managed?
Because LCIS is not cancer, treatment usually focuses on risk reduction and careful monitoring, rather than surgery or chemotherapy.
Management may include:
Regular breast screening, such as annual mammograms
Breast MRIs, for some higher-risk individuals
Clinical breast exams at regular intervals
Risk-reducing medications (such as hormone-blocking therapy) for some patients
Lifestyle modifications, including maintaining a healthy weight and limiting alcohol
Preventive surgery is rarely recommended and is reserved only for people with a very high overall risk.
Why Ongoing Monitoring Matters
LCIS is often referred to as a “warning sign” rather than a diagnosis. With appropriate follow-up:
Breast cancer can often be detected at an early, highly treatable stage
Many people with LCIS never develop breast cancer
In general, long-term outcomes are excellent
A Closing Message
Being diagnosed with LCIS can sound frightening, but it is important to remember:
LCIS is not breast cancer
It does not require cancer treatment
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