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These are small molecules that assist with all important bodily functions, including growing, generating energy, removing toxins and reproducing.Each cancer type produces a different set of metabolites, which signal to doctors that something is wrong with a patient.

The handheld device is simple for physicians to use: they press the pen against their patient's tissue, trigger its analysis with a foot petal and wait for its result. Dr Jialing Zhang, who worked in Professor Eberlin's lab, said: 'When designing the Mas Spec Pen we made sure the tissue remains intact by coming into contact only with water and the plastic tip of the Mas Spec Pen.'It identifies cancer simply by touch.

A new device from the University of Texas Austin will be able to detect cancerous cells in a patient's tissue in a matter of seconds.

Once this has been done, a computer screen will inform doctors whether or not the tissue they are inspecting is cancerous Cells - both healthy and cancerous - produce metabolites.

Although maximizing the cancer that is removed from a patient's body is crucial, if too much healthy tissue is removed it can trigger profound negative consequences for cancer patients.

For example, if a doctor removes too much from a breast cancer patient, the patient has a higher risk of experiencing nerve damage and painful side effects.