CausesBy Mayo Clinic staff
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It's not clear what causes invasive lobular carcinoma.
How invasive lobular carcinoma forms
Doctors know that invasive lobular carcinoma begins when cells in one or more milk-producing glands of the breast develop mutations in their DNA. The mutations tell the cells to divide and grow rapidly. The cancer cells can spread to other parts of the body.
Lobular carcinoma cells tend to invade surrounding breast tissue in a web-like manner. The affected area may have a different feel from the surrounding breast tissue, but it is unlikely to feel like a lump.
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