Christina Applegate says she has a clean bill of health after being treated for breast cancer.

The star of "Samantha Who?" tells "Good Morning America," in an interview to air Tuesday that she's "absolutely 100-percent clear and clean." She says the cancer did not spread, in her words: "They got everything out."

Applegate says when she first found out she had breast cancer, she was so mad that she "was just shaking" but immediately went into "take-care-of-business-mode," asking all the questions about treatment. Applegate's mother battled breast cancer, so she says she began getting mammograms six years ago when she was 30.

Applegate is scheduled to appear on a one-hour TV special, "Stand Up to Cancer," to air on ABC September 5th to raise money for cancer research.