Scientists have developed a wireless 'in-body GPS' which helps to track tumours inside the body. It is named as;

Scientists have developed a wireless 'in-body GPS' system named "ReMix" that can accurately locate ingestible implants and track tumours inside the body. ReMix was able to track implants with centimetre-level accuracy in animal tests. Similar implants can be used to deliver drugs to specific regions of the body. The test was conducted by scientists from Massachusetts Institute of Technology (MIT) and Massachusetts General Hospital (MGH) in the US. ReMix is not accurate enough to be implemented in clinical settings as of now. For actual implementation, the margin of error should be closer to nearly two millimetres.