US researchers have recreated the process by which ovarian cancer forms in the lab, providing solid evidence that the tumours start in the fallopian tubes, not the ovaries, a study said.

The finding could provide clues on how to attack ovarian cancer, which often causes no early symptoms and by the time it is found has spread so much that the tumours are impossible to stop.

Ovarian cancer is the fifth deadliest cancer among women, affecting 200,000 women worldwide annually and killing 115,000 women on average each year.

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