Magic wand helps spot even tiny breast tumours
AWAND that uses radio waves to pinpoint hard-tofind breast tumours could dramatically improve the accuracy of cancer surgery and prevent thousands of women from having to undergo further operations.
A quarter of all breast cancer surgery patients need a second operation to remove tumours because not all of the cancer was detected and removed the first time round.
Currently, surgeons use their fingers carefully to locate larger tumours. But those too small to be felt — which make up a third of all breast tumours — must be pinpointed with a very fine stainless steel wire positioned into the centre of the tumour, using ultrasound to identify the area to be removed.
Inserting the wire can be painful, and wires can move, leading to the wrong tissue being removed.
The new, US-made hand-held Savi Scout wand uses radar signals and connects to a console that gives the surgeon an image on screen that can place the tumour within 1 mm accuracy.
First, a marker — the size of a piece of rice and containing infrared light receptors — is implanted under local anaesthetic at the tumour site using a fine needle, guided by scans.
Then the wand, which emits radar signals, is used to locate the marker, which reflects the radar signals back to the console to be converted into sounds that guide the surgeon to the precise position of the tumour.
The marker is then removed at the time of surgery. A recent report, published in the journal Anticancer Research this month, reviewing 11 studies involving 842 Savi Scout procedures, found the device reduced the need for further surgery by 50 per cent, compared with standard wireguided surgery.
The study’s author, Professor Kefah Mokbel, a breast surgeon at the Princess Grace Hospital, London, has now treated 20 women using the new wand, with only one requiring further surgery to remove remaining cancer.
Veronica Shaw, 74, became one of the first European patients to benefit from the new technology when she had breast cancer in February this year.
A routine scan in January identified a small lump in her right breast, which could not be felt by a physical examination. Her surgeon, Professor Mokbel, suggested using Savi Scout.
‘Having the marker implanted the day before the operation was a bit like having a biopsy, although not as painful,’ she says.
‘It was done under local anaesthetic and only took a matter of seconds. I then had a scan to make sure it was in the right place.’
The one-hour operation to remove the tumour was successful and no further surgery was needed. Veronica then underwent radiotherapy to mop up any stray cancer cells.
Daniel Leff, a breast cancer surgeon, says: ‘Savi Scout is just one example of a range of similar emerging technologies that could replace the need for wires.’
He adds: ‘However, it’s relatively early days and we need to understand more — for example, research so far has only involved relatively small numbers of patients.’