In order to improve the electrochemical measurement performance, Wang et al. modified multi-walled carbon nanotubes on a μPAD and simultaneously detected cancer antigen 125 (CA125) and carcinoembryonic antigen (CEA) tumor markers from serum samples using a 3D platform generated by horseradish peroxidase (HRP)-labeled signal antibodies. The gene discussed is CEACAM5; the disease is neoplasm.