(NEW YORK) — A fast-rising form of breast cancer that’s harder to detect on mammograms now makes up more than one in ten cases in the United States, according to a new report from the American Cancer Society (ACS).

Invasive lobular carcinoma, the second most common breast cancer type, is increasing about 3% each year, more than triple the rate of other breast cancers, the report, published on Tuesday morning, found.

About 80% of breast cancers are the invasive ductal type, which occurs when cancer cells grow in the milk ducts and invade the surrounding breast tissue.

However, incidence of invasive lobular carcinoma, a cancer than develops in the milk-producing glands of the breast — once rare — has doubled since the 1970s.

Lobular breast cancer hasn’t drawn much attention partly becaus

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