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World’s biggest ovarian cancer trial

17 December 2015

Ovarian Cancer

First evidence to suggest that screening for ovarian cancer may save lives

New results from the world’s biggest ovarian cancer screening trial, led by UCL in collaboration with Cardiff and other centres in the UK, suggest that screening based on an annual blood test may help reduce the number of women dying from the disease by around 20%.

The research, published today (Thursday) in the Lancet, also cautions that longer follow up is needed to establish more certain estimates of how many deaths from ovarian cancer could be prevented by screening. Estimates from the results so far are promising, but the exact figures remain uncertain.

The UK Collaborative Trial of Ovarian Cancer Screening (UKCTOCS) is an international ovarian cancer screening trial, led by UCL and funded by the Medical Research Council, Cancer Research UK, Department of Health and The Eve Appeal.

Ovarian cancer was diagnosed in 1,282 women during the 14-year study of more than 200,000 post-menopausal women aged 50 to 74, of whom 649 had died of the disease by the trial end in December 2014.

The study showed a delayed effect on mortality between the screening and control arms, which became significant after the first seven years of the trial. The research team are now following up the study for three more years to establish the full impact of ovarian cancer screening.

The early results suggested that approximately 15 ovarian cancer deaths could be prevented for every 10,000 women who attend a screening programme that involves annual blood tests for between seven to 11 years.

The trial also confirmed previous findings that on average, for every three women who had surgery as a result of an abnormal screen, one woman had ovarian cancer while two women did not. For those who had surgery, around three per cent had major complications, which is the standard complication rate for this type of surgery in the NHS.

Professor Nazar Amso, from the University’s School of Medicine, who led the Cardiff arm of the trial, said: “It's been a privilege for Cardiff to be part of the largest ovarian cancer trial, ever. The UKCTOCS results suggest that screening can lead to early detection and saves lives. Obviously, longer term follow up would increase our understanding of benefit and raises more hope to millions of women at risk of ovarian cancer. We're indebted to the women volunteers who took part and the hard work of all in the 13 centres.”

Professor Usha Menon, UCL Women’s Health, who co-led the trial and receives research funding from Abcodia Ltd., said: “UKCTOCS has been an immense research effort spanning 14 years, over 200,000 women and 700,000 annual screens. Finally we have data which suggests that screening may prevent ovarian cancer deaths. This is welcome news and provides fresh impetus for renewed efforts in this area.”

Dr Fiona Reddington, Cancer Research UK’s head of population research, said: “This trial has been incredibly useful in improving our understanding of ovarian cancer. Detecting it early is vital to make sure that patients have the best treatment options and that more women can survive the disease. It’s uncertain whether or not screening can reduce ovarian cancer deaths overall. While this is an important step in ovarian cancer research, we would not recommend a national screening programme at this point.”

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