Breast cancer is suspected after a clinical breast exam which is positive for lumps or unusual changes with the breasts and armpits. A diagnosis is made after extensive testing including imaging tests (mammogram, ultrasound), breast biopsy, blood chemistry tests, and genetic tests. After a diagnosis is made, further testing is done to characterize the breast cancer. For example, tests for progesterone/estrogen receptor density and cancer metastasis are completed to personalize treatment options.[1]