text: Microfluidics-assisted FISH ([http://www.nature.com/labinvest/journal/v97/n1/abs/labinvest2016121a.html MA-FISH]) uses a microfluidic flow to increase DNA hybridization efficiency, decreasing expensive FISH probe consumption and reduce the hybridization time. MA-FISH is applied for detecting the HER2 gene in breast cancer tissues.