While no one likes to discuss tumors, benign or malignant, some of the most important and helpful information is the size.Stanford engineers developed a new wearable device that monitor how tumors grow and shrink. This device can help future medical research and treatment of tumors.

FAST’s sensor is composed of a flexible and stretchable skin-like polymer that includes an embedded layer of gold circuitry. This sensor is connected to a small electronic backpack designed by former postdocs and co-authors Yasser Khan and Naoji Matsuhisa. The device measures the strain on the membrane – how much it stretches or shrinks – and transmits that data to a smartphone. Using the FAST backpack, potential therapies that are linked to tumor size regression can quickly and confidently be excluded as ineffective or fast-tracked for further study.

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