What is ‘stage zero’ breast cancer and how is it treated?
Here’s what the science says in the wake of actress Danielle Fishel's diagnosis
![A microscope image of ductal carcinoma in situ](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2024/08/082724_lg_dcis_feat.jpg?fit=1030%2C580&ssl=1)
Ductal carcinoma in situ, the appearance of tumor cells within the mammary ducts (shown here in a microscope image) is the earliest form of breast cancer and affects 55,000 people per year in the US.
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