A gestational trophoblastic tumour (GTT) is a rare condition that arises in the placenta. Cancer begins when normal cells begin to change and grow uncontrollably, forming a mass called a tumour. A tumour can be benign (noncancerous) or malignant (cancerous, meaning it can spread to other parts of the body.) GTT is most commonly the result of a pregnancy with an abnormal combination of a sperm and egg. In other cases, a GTT is a cancerous growth that begins from a normal placenta. The placenta is the organ that develops during pregnancy and connects the fetus (unborn baby) to the uterus, also called the womb.
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