Researchers from the University of Michigan developed a new microfluidic chip based on Graphene Oxide that can capture tumor cells from blood and support their growth for further analysis. This device could be used for both cancer diagnosis and find the best test-treatment options, without biopsies. The researchers estimate that such chips could reach clinics within 3 years:

http://www.graphene-info.com/graphene-oxide-based-chips-could-enable-biopsy-free-early-cancer-diagnosis-within-3-years