Nonsmokers Still at Risk for Lung Cancer. In the United States, about 10% to 20% of lung cancer diagnoses happen in people who have never smoked or have smoked fewer than 100 cigarettes in their lifetime.

Biomarkers are proteins, hormones, or pieces of DNA that can be released by cancer cells or by your body in response to cancer.

Is Frequent Urination a Sign of Prostate Cancer? Frequent urination can be linked to several prostate conditions that place pressure on the urinary system.