Less aggressive treatment for low-risk breast cancer ‘just as effective'
More than 37,000 women have radiotherapy for breast cancer in the UK every year.
The treatment uses radiation to kill cancer cells and is usually given after surgery to reduce the risk of the disease coming back.
However, side-effects can include changes in breast size and shape, swelling in the arms or breast, and pain.
The Import Low trial, led by The Institute of Cancer Research, London, and the University of Cambridge, found limiting radiation to the tumour area, rather than treating the whole breast, was just as effective.
The study included 2,018 women across 30 radiotherapy centres in the UK, who were monitored for 10 years after treatment.
It compared three radiotherapy approaches; whole-breast, partial-breast and a reduced-dose.
After a decade, cancer recurrence rates in the group given partial radiotherapy was 3%, the same proportion as those who had been treated with a more aggressive approach.
Patients who had targeted radiotherapy were also less likely to experience long-term changes in breast appearance.
Some 15% reported noticeable changes at five years compared with 27% in the whole-breast radiotherapy group.
Dr Anna Kirby, consultant clinical oncologist at The Royal Marsden NHS Foundation Trust, and reader in breast cancer radiotherapy at The Institute of Cancer Research, London, said: 'The long-term results of this study confirm that a less aggressive approach, limiting radiotherapy to the tumour rather than the whole breast, is just as effective as traditional whole-breast radiotherapy.
'Patients receiving partial-breast radiotherapy experience fewer side-effects while maintaining excellent cancer control.'
Charlotte Coles, a professor of breast cancer clinical oncology at the University of Cambridge, honorary clinical oncology consultant at Cambridge University Hospitals NHS Foundation Trust, and chief investigator of the Import Low study, said the trial has 'transformed' how early breast cancer is treated.
Following the study, which is published in the Lancet Oncology, partial-breast radiotherapy has been integrated into NHS treatment guidelines.
It is hoped that more than 9,000 women in the UK could benefit from more targeted treatment.
'By targeting the area around the tumour, rather than the whole breast, we have demonstrated that patients can achieve the same outstanding long-term outcomes with fewer complications,' Prof Coles said.
'This approach is now widely adopted across the NHS, sparing thousands of women from unnecessary radiation exposure.
'The results of this study have not only shaped UK clinical practice but also informed international guidelines, ensuring that women worldwide benefit from this personalised, evidence-based treatment.'
Hilary Stobart, now 70, was diagnosed with ER-positive breast cancer in December 2008, with a 2cm tumour in her left breast.
Ms Stobart, who was 54 at the time, was offered the chance to take part in the trial after surgery and was treated with partial radiotherapy.
'I had three weeks of radiotherapy, but suffered no side-effects, other than some soreness in my breast and nipple in the first few weeks,' she said.
'Ten years on, I am doing fine. I have no side-effects and no recurrence of disease.
'For me personally, I am very thankful to have received the lowest dose of radiotherapy.
'Whilst I may have had some niggling worries in the early days, having seen the results of the trial, I feel positive and optimistic now. I know that I was lucky enough back then to have had the best treatment, a treatment that other women will be routinely offered now.'
Dr Fay Cafferty, lead statistician at The Institute of Cancer Research, London, added that the findings are 'crucial in reinforcing the long-term safety and effectiveness of partial-breast radiotherapy'.
'Long-term data is vital to ensure we know there's no greater risk of breast cancer returning after this targeted radiotherapy treatment,' she said.
'This latest analysis confirms that partial breast radiotherapy remains a safe and effective treatment option, supporting its continued adoption as the standard of care in the UK and globally.'
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