Cancer, by nature, is a destructive force. Sometimes, it spreads, or metastasizes, to a distant body part. While some cancer cells die during this process, others might go on to create additional tumors. Cancer's ability to spread throughout the body can turn a curable case into an aggressive and sometimes fatal one. A team of engineers and cancer biologists may have found a way to slow down, and even stop, the migration of breast cancer cells. The majority of treatments are ineffective at curing metastatic cancer, so it is vital to find ways to stop the cancer cells from spreading. Researchers believe electromagnetic fields can help. While this has been a point of interest for years, it is only recently that experts have begun to unravel the mechanism. A new study, published in Communications Biology, has found that these electromagnetic fields are effective in halting the spread of some breast cancer cells. The speed at which breast cancer migrates varies between individuals, and it is almost impossible for experts to calculate how and when cell mutations occur. What we showed, biologically, is that these cancer cells are becoming profoundly less metastatic, which is a very important finding.", says Jonathan Song.