Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Breast Cancer Health Center

Font Size

Lobular Carcinoma (Invasive and In Situ)

Most breast cancers start in the ducts of the breasts, but some begin in the glands that produce milk, called the lobules.

These are:

Recommended Related to Breast Cancer

Breast Cancer Survivor Stories

These four women lead very different lives, but they all have one thing in common: They developed breast cancer at a young age. They discovered community within the Young Survival Coalition, a national organization dedicated to providing support to young women with breast cancer -- and raising awareness of the disease in women under 40.

Read the Breast Cancer Survivor Stories article > >

  • Lobular carcinoma in situ (LCIS), also called lobular neoplasia
  • Invasive lobular carcinoma (ILB), also called infiltrating lobular carcinoma

The symptoms, diagnosis, and treatment for each are different.

Lobular Carcinoma in Situ

LCIS isn’t cancer, but it’s thought to be a sign that breast cancer will develop. With this condition, there are abnormal cells in the lobules of the breasts, but these cells rarely spread to other parts of the breast or body. The phrase "in situ" means "in its original place."

Most women who are diagnosed with LCIS haven’t yet gone through menopause. Often, multiple lobules are affected. About a third of the time, there are areas of lobular carcinoma in situ in both breasts.

Even though this condition doesn’t spread, it’s important to keep an eye on it. Between 20% to 40% of women with this condition will develop a separate invasive breast cancer -- one that will grow outside its original location -- within the next 15 years. Most of the time, these later cancers begin in the milk ducts, rather than the lobules.

How is lobular carcinoma in situ diagnosed?

You often won’t have any symptoms with LCIS. Many times, it’s not even found by routine mammograms. Unlike other breast cancers and related conditions, LCIS doesn’t cause lumps. It’s most commonly diagnosed when a biopsy is done for another condition.

The biopsy findings for LCIS can be very similar to an actual breast cancer called ductal carcinoma in situ. Because of this, you may want to ask for a second opinion to confirm your diagnosis.

How is lobular carcinoma in situ treated?

Most women with LCIS won’t need immediate treatment with surgery or medicines. Instead, the doctor may recommend keeping a close eye on your condition. That means regular breast self-exams, office visits, and routine mammograms or other tests such as MRIs.

If you have a family history of breast cancer and are at an increased risk, your doctor may discuss the use of medications such as anastrozole (Arimidex), exemestane (Aromasin), raloxifene (Evista), or tamoxifen (Nolvadex). These drugs may lower the chance that you’ll develop invasive breast cancer.

Some women at higher risk opt to undergo preventive surgery called a prophylactic mastectomy. The procedure removes one or both breasts. Doing so can significantly reduce the risk of breast cancer in the future.

1 | 2 | 3

Today on WebMD

Breast Cancer Overview
From self-exams and biopsies to reconstruction, we’ve got you covered.
Dealing with breast cancer
Get answers to your questions.
woman having mammogram
Experts don’t agree on all fronts, but you can be your own advocate.
woman undergoing breast cancer test
Many women worry. But the truth? Most abnormalities aren’t breast cancer.
Breast Cancer Treatments Improving
Resolved To Quit Smoking
Woman getting mammogram
Screening Tests for Women
ovarian cancer overview slideshow
serious woman
what is your cancer risk
10 Ways to Revitalize Slideshow