The use of ultrasound-guided surgery to remove tumours from women who have palpable breast cancer is much more successful than standard surgery in excising all the cancerous tissue while sparing as much healthy tissue as possible, according to the results of a randomised controlled trial.
As a consequence, researchers told the eighth European Breast Cancer Conference (EBCC-8) today (Friday) they expect their findings will change surgical practice and ultrasound-guided surgery (USS) should become the norm for excising palpable tumours i.e. those that can be felt and, at present, are excised "blindly", without visual aid from tools to help locate the precise position of the tumour during surgery.
When surgeons opt for breast conserving surgery and remove only the tumour rather than the whole breast, they need to include a margin of cancer-free tissue around the tumour during the surgery. This is so that they can be fairly sure that they have removed all the cancerous tissue in order to reduce the chance of local recurrence to a minimum when combined with standard radiotherapy. The margin of "healthy" tissue is analysed to check that it is free of cancer cells, and if it is not, then further surgery, or an additional radiotherapy boost may be required.
Dr Nicole Krekel, a PhD student in the department of surgical oncology and resident doctor in plastic and reconstructive surgery at VU University Medical Center in Amsterdam, The Netherlands, told the meeting: "Breast-conserving surgery for palpable breast cancer is generally performed with guidance from surgeon's palpation only, without help from intra-operative tumour localisation techniques. The standard method of surgery for non-palpable breast cancer involves a wire to identify the area of cancerous tissue that the surgeon needs to remove – a technique known as wire localisation. Unfortunately, both methods of excision are associated with a high rate of margins that contain cancer cells, as well as the excision of excessively large volumes of tissue. Despite studies showing the benefits of USS over wire localisation for non-palpable breast cancer, remarkably USS has not been widely integrated into daily surgical practice. In contrast to non-palpable tumours, there has been little research into the use of USS for palpable breast cancer."
Dr Krekel and her colleagues randomised 124 patients with palpable early stage breast cancer to either USS or standard palpation-guided surgery (PGS). They found that among the 61 women in the USS group only 3.3% of the margins contained cancerous cells compared with 16.4% among the 63 women in the PGS group. As a result, USS resulted in a significant reduction in re-excisions, mastectomies and extra radiotherapy. The amount of healthy tissue removed in the USS group was smaller than in the PGS group (40 cubic centimetres versus 58 cc respectively).
By measuring the volume of the tissue excised during surgery and the actual tumour diameters, the researchers calculated the amount of excess healthy tissue that had been removed, which gave them the "calculated resection ratio" (CRR). A CRR of 1.0 would indicate the ideal amount of tissue had been removed, while a CRR of 2.0 would indicate that double the amount necessary had been removed. They found that the CRR in the USS group was 1.0 (ideal), while in the PGS group it was 1.9.
"Our results show that USS can prevent the unacceptably high rate of margins containing cancer cells in palpable breast cancer excision, thus avoiding subsequent surgery or radiotherapy. In addition, USS largely reduces the amount of unnecessary healthy breast tissue resection, thereby contributing to the improvement of cosmetic results," said Dr Krekel.
"The trial was only completed in February this year and the results are striking. By using USS, 96.7% of all tumours were excised with adequate, tumour-free margins, compared with only 83.4% in the PGS group, yet the volume of tissue excised was significantly smaller in the USS group.
"The clinical implications of our study are tremendous and we believe they should be included in international guidelines. Given the overwhelming advantages of ultrasound-guided surgery, 'blind', palpation-guided excisions should be completely replaced, with ultrasound-guided surgery becoming the standard of care for both palpable and non-palpable breast cancer surgery. The surgeon performing adequate ultrasound will clearly provide better surgical practice. It is therefore highly recommended for surgeons to learn the skills needed to perform USS."
Dr Krekel said the reason why USS was superior to PGS was because it enabled surgeons to see all round the tumour while they were performing the operation. "Intra-operative US enables the surgeon to optimally position the incision on the breast, and to operate under direct vision. This provides the surgeon with more precision in localising tumours and determining the size of the lesions than palpation alone, and allows intra-operative orientation, and assessment of surgical margins. It allows complete tumour removal, while continuously monitoring the maintenance of adequate, small resection margins without unnecessarily sacrificing healthy breast tissue. After excision, the completeness of tumour excision can be checked once again with US. The technique is non-invasive, simple, safe and effective, and can be easily learned, " she explained.
Professor David Cameron, from the University of Edinburgh (Edinburgh, UK), and chair of EBCC-8 said: "This study offers the promise of more successful breast conserving surgery for women with early breast cancer. If the pathologist reports that there is still cancer present at the margin of an excision, usually more surgery is needed: importantly, this study offers a way to reduce the chance of this. However, it is a report from only one hospital, and these findings need confirmation from other teams of surgeons before they should become standard practice."
Abstract no: 1 LBA, Friday 15.00 hrs, Keynote symposium, Hall D
Emma Mason | EurekAlert!
Gentle sensors for diagnosing brain disorders
29.09.2016 | King Abdullah University of Science and Technology
New imaging technique in Alzheimer’s disease - opens up possibilities for new drug development
28.09.2016 | Lund University
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences