See cancer for the biology of the disease, as well as a list of malignant diseases. Oncology is a branch of medicine that deals with the prevention, diagnosis and treatment of cancer. A medical professional who practices oncology is an oncologist. The name's etymological origin is the Greek word á½Î³ÎºÎ¿Ï (Ã³nkos), meaning tumor, volume or mass.
1 An increase in maternal age affects the chances of miscarriage. 2  Women under the age of 35 yrs old have about a 15% chance of miscarriage. 3  Women who are 35-45 yrs old have a 20-35% chance of miscarriage. 4  Women over the age of 45 can have up to a 50% chance of miscarriage.
In 1988, the teenage pregnancy rate was 113 per 1,000 women aged 15-19. The rate was 74 per 1,000 among those aged 15-17. 50 percent of teenage pregnancies conceived in 1987 resulted in a birth, 36 percent in an abortion, and an estimated 14 percent in miscarriage. The number of abortions for every 100 live births showed a gradual decline since 1980 (35.9) to 1992 (33.5).