ONCOLOGIST - A doctor who specializes in treating cancer, either through surgery, radiation, or the administration of special drugs.
ONCOTYPEDX® - A genetic test offered by Genomic Health Inc. performed with tissue obtained either from a biopsy or prostatectomy that measures how aggressive a cancer is likely to be.
ORCHIECTOMY - Surgery to remove the testes, but not the scrotum.
OSTEOBLASTIC - The typical type of bone metastasis seen in prostate cancer. These lesions are characterized by abnormal bone generation (osteoblastic) rather than bone loss (osteolytic).
OSTEOPOROSIS - A demineralization of the bone which may accompany androgen deprivation therapy.