The search textbox has an autosuggest feature. When you enter three or more characters,
a list of up to 10 suggestions will popup under the textbox. Use the arrow keys
to move through the suggestions. To select a suggestion, hit the enter key. Using
the escape key closes the listbox and puts you back at the textbox. The radio buttons
allow you to toggle between having all search items start with or contain the text
you entered in the search box.
![](https://webarchive.library.unt.edu/web/20120921153853im_/http://www.cancer.gov/images/spacer.gif)
CA 15-3
![](https://webarchive.library.unt.edu/web/20120921153853im_/http://www.cancer.gov/images/spacer.gif)
A protein found on epithelial cells that is part of a larger protein called MUC 1. CA 15-3 may be found in higher than normal amounts in patients with some types of cancer, including breast cancer. Measuring the amount of CA 15-3 in the blood may be useful in checking how well cancer treatment is working or if cancer has come back. CA 15-3 is a type of tumor marker. |