Scientists are experimenting with an implant that can track the spread of cancer cells in the bloodstream, speeding up diagnosis and life-saving treatment.

Scientists in the United States say they have created a tiny implant which, in mice for now, captures cancer cells spreading through the body.

Cells moving from the original cancer site to infect other organs in a stealthy process called metastasis are usually detected too late to save a patient's life.

The early detection of circulating tumour cells, or CTCs, in the bloodstream can speed up diagnosis and life-saving treatment.

But these wandering cancer cells travel in very small numbers, often for long periods of time, before settling in a new site, and are thus very hard to spot.

The study, published in the journal Nature Communication on Tuesday, suggests that capturing CTCs would prevent their spread and help halt disease progression.

"Animals receiving an implant had a significantly reduced burden of disease in their lungs relative to animals that did not have an implant," study co-author Lonnie Shea at Northwestern University in Illinois told AFP.

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In experiments, Shea and a team built biodegradable disks about half-a-centimetre wide, and implanted two per mouse.

The implant, which used immune cells as bait, also contained a scanner to detect the presence of trapped cells.

"The combined systems can enable the early detection of metastatic disease," Shea said by email.

"The initial benefit is detection -- catching the metastasis before it spreads widely throughout the body," he explained.

"However... the opportunity to reduce burden (of cell spread) can potentially extend the period of time over which therapies may be effective."

As a bonus, the implant collected metastasised cancer cells for analysis, making it easier to identify the best treatment.

There was no reason to believe the results achieved in lab mice could not be replicated in humans, said Shea.

"The main idea of cells colonising organs is the same between mice and humans, and while some of the details may change, we think we can build that into the design of our implant."

Shea said he hoped clinical trials with human cancer sufferers could begin soon.