The trial looked at several hundred prostate cancer patients who had tumors surgically removed in the 1990s and then received no further treatment.

FORBES: Gene Tests That Predict When You Will Die

The abdominal tumor was surgically removed, but doctors at Rigshospitalet in Copenhagen had no treatment for his other tumors.

FORBES: Magazine Article

The cancer was surgically removed in a procedure called a lumpectomy, and Navratilova will undergo radiation treatment, she said.

CNN: Martina Navratilova has breast cancer

Despite being told there was a 5% chance that chemotherapy would affect a tumor in the trachea, the tumor has become softer since treatment and has moved away from the thyroid gland, which makes it easier to remove surgically.

CNN: Cancer can't stop teen singer's music